/* roulang page: index */
:root {
  --primary: #1B6DE0;
  --accent: #19C8B4;
  --bg-dark: #0B1B2B;
  --bg-deep: #0E2233;
  --bg-card: #11243A;
  --text-main: #E6F0FA;
  --text-secondary: #93A9C2;
  --text-muted: #6B7F99;
  --border: rgba(255,255,255,0.08);
  --border-hover: rgba(25,200,180,0.4);
  --radius: 16px;
  --radius-sm: 8px;
  --shadow: 0 8px 30px rgba(0,0,0,0.25);
  --shadow-hover: 0 14px 40px rgba(0,0,0,0.4);
  --transition: all 0.3s ease;
  --font-stack: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-stack);
  background: linear-gradient(160deg, var(--bg-dark) 0%, var(--bg-deep) 100%);
  color: var(--text-main);
  line-height: 1.75;
  font-size: 1rem;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; transition: var(--transition); }
img { max-width: 100%; height: auto; display: block; }
button, input, select, textarea { font-family: inherit; font-size: inherit; }
button { cursor: pointer; border: none; background: none; }
ul, ol { list-style: none; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 clamp(1rem, 4vw, 2rem); }

/* Header */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: 72px;
  background: rgba(11, 27, 43, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transition: var(--transition);
}
.site-header.scrolled {
  height: 60px;
  background: rgba(10, 24, 38, 0.92);
  box-shadow: 0 8px 30px rgba(0,0,0,0.35);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 24px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.logo-mark {
  width: 38px; height: 38px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 1.1rem;
  color: #fff;
  box-shadow: 0 0 18px rgba(25,200,180,0.35);
}
.logo-text {
  font-size: 1.28rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text-main);
}
.nav-tabs {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  justify-content: center;
  flex-wrap: nowrap;
  overflow-x: auto;
  scrollbar-width: none;
}
.nav-tabs::-webkit-scrollbar { display: none; }
.tab {
  display: inline-flex;
  align-items: center;
  padding: 8px 18px;
  border-radius: 999px;
  border: 1px solid var(--border);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  white-space: nowrap;
  transition: var(--transition);
}
.tab:hover {
  color: var(--text-main);
  border-color: rgba(255,255,255,0.2);
  background: rgba(255,255,255,0.05);
}
.tab.active {
  background: linear-gradient(135deg, rgba(27,109,224,0.35), rgba(25,200,180,0.25));
  border-color: rgba(25,200,180,0.5);
  color: #fff;
  box-shadow: 0 0 16px rgba(25,200,180,0.15);
}
.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  font-size: 0.9rem;
  font-weight: 600;
  flex-shrink: 0;
  transition: var(--transition);
  box-shadow: 0 4px 16px rgba(27,109,224,0.3);
}
.nav-cta:hover {
  box-shadow: 0 0 24px rgba(25,200,180,0.45);
  transform: translateY(-1px);
  color: #fff;
}
.nav-cta:active { transform: translateY(1px); }
.hamburger {
  display: none;
  width: 42px; height: 42px;
  border-radius: 10px;
  border: 1px solid var(--border);
  align-items: center;
  justify-content: center;
  color: var(--text-main);
  font-size: 1.2rem;
  transition: var(--transition);
}
.hamburger:hover { border-color: rgba(25,200,180,0.4); color: var(--accent); }

/* Mobile nav */
.mobile-nav {
  position: fixed;
  top: 72px; left: 0; right: 0;
  background: rgba(10, 24, 38, 0.97);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  z-index: 999;
  padding: 12px 0;
  display: none;
  transform: translateY(-12px);
  opacity: 0;
  transition: var(--transition);
}
.mobile-nav.open { transform: translateY(0); opacity: 1; }
.mobile-nav a {
  display: flex;
  align-items: center;
  padding: 12px 24px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  border-left: 3px solid transparent;
  transition: var(--transition);
}
.mobile-nav a:hover { color: #fff; background: rgba(255,255,255,0.04); }
.mobile-nav a.active { color: var(--accent); border-left-color: var(--accent); background: rgba(25,200,180,0.06); }

/* Hero */
.hero {
  position: relative;
  padding: calc(72px + clamp(3rem, 7vw, 5.5rem)) 0 clamp(3rem, 6vw, 5rem);
  background:
    radial-gradient(ellipse at 75% 20%, rgba(27,109,224,0.22) 0%, transparent 60%),
    radial-gradient(ellipse at 15% 80%, rgba(25,200,180,0.12) 0%, transparent 50%),
    linear-gradient(180deg, #0B1B2B 0%, #0E2233 100%);
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}
.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}
.hero-content { max-width: 620px; }
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 999px;
  background: rgba(25,200,180,0.1);
  border: 1px solid rgba(25,200,180,0.3);
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 500;
  margin-bottom: 1.5rem;
}
.hero-title {
  font-size: clamp(2.2rem, 4vw, 3.5rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 1.2rem;
}
.hero-title .highlight {
  background: linear-gradient(135deg, #4A9FFF, var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-subtitle {
  font-size: 1.08rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 2rem;
  max-width: 500px;
}
.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 2.2rem;
}
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 30px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  font-weight: 600;
  font-size: 0.95rem;
  transition: var(--transition);
  box-shadow: 0 4px 18px rgba(27,109,224,0.35);
}
.btn-primary:hover {
  box-shadow: 0 0 26px rgba(25,200,180,0.5);
  transform: translateY(-2px);
  color: #fff;
}
.btn-primary:active { transform: translateY(0); }
.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255,255,255,0.18);
  background: rgba(255,255,255,0.03);
  color: var(--text-main);
  font-weight: 500;
  font-size: 0.95rem;
  transition: var(--transition);
}
.btn-secondary:hover {
  border-color: rgba(255,255,255,0.4);
  background: rgba(255,255,255,0.07);
  color: var(--accent);
  transform: translateY(-1px);
}
.btn-secondary:active { transform: translateY(0); }
.hero-visual {
  position: relative;
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,0.1);
  box-shadow: 0 20px 60px rgba(0,0,0,0.45);
  aspect-ratio: 4/3;
}
.hero-visual img {
  width: 100%; height: 100%;
  object-fit: cover;
}
.hero-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(11,27,43,0) 55%, rgba(11,27,43,0.4) 100%);
  pointer-events: none;
}
.hero-stats {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 2.5rem;
}
.stat-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  border-radius: 999px;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  backdrop-filter: blur(8px);
  font-size: 0.85rem;
  color: var(--text-secondary);
}
.stat-pill i {
  color: var(--accent);
  font-size: 0.9rem;
}

/* Section base */
.section {
  padding: clamp(4rem, 8vw, 7rem) 0;
  position: relative;
}
.section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: clamp(2rem, 4vw, 3rem);
}
.section-header h2 {
  font-size: clamp(1.6rem, 2.4vw, 2.2rem);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.3;
}
.section-header .subtitle {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-top: 6px;
  max-width: 420px;
}
.view-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-secondary);
  font-size: 0.92rem;
  font-weight: 500;
  flex-shrink: 0;
  transition: var(--transition);
}
.view-more:hover { color: var(--accent); }
.view-more span { transition: transform 0.3s ease; }
.view-more:hover span { transform: translateX(4px); }

/* Pain section */
.pain-section {
  background: rgba(255,255,255,0.015);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.pain-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.pain-card {
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: clamp(1.5rem, 2.6vw, 2.2rem);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.pain-card:hover {
  border-color: rgba(25,200,180,0.3);
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}
.pain-icon {
  width: 46px; height: 46px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(27,109,224,0.25), rgba(25,200,180,0.15));
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 1.1rem;
  font-size: 1.15rem;
  color: var(--accent);
}
.pain-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.6rem;
}
.pain-card p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.7;
}

/* Solution section */
.solution-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  grid-template-rows: auto auto;
  gap: 24px;
}
.solution-card {
  background: rgba(255,255,255,0.04);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: clamp(1.4rem, 2.4vw, 2rem);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.solution-card:hover {
  border-color: rgba(25,200,180,0.4);
  box-shadow: var(--shadow-hover);
  transform: translateY(-5px);
}
.solution-card.featured {
  grid-row: span 2;
  background: linear-gradient(160deg, rgba(27,109,224,0.12), rgba(25,200,180,0.06)), rgba(255,255,255,0.03);
}
.solution-card .sol-icon {
  width: 50px; height: 50px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(27,109,224,0.3), rgba(25,200,180,0.2));
  display: flex; align-items: center; justify-content: center;
  font-size: 1.25rem;
  color: var(--accent);
  margin-bottom: 1.2rem;
  box-shadow: 0 0 20px rgba(25,200,180,0.1);
}
.solution-card h3 {
  font-size: 1.12rem;
  font-weight: 600;
  margin-bottom: 0.6rem;
}
.solution-card p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.7;
  margin-bottom: 1.2rem;
}
.solution-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--accent);
  font-size: 0.88rem;
  font-weight: 500;
  transition: var(--transition);
}
.solution-link:hover { gap: 10px; color: #fff; }
.solution-card.featured .sol-desc {
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
}
.solution-feature-list {
  list-style: none;
  margin-top: 0.5rem;
}
.solution-feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 8px 0;
  color: var(--text-secondary);
  font-size: 0.92rem;
  border-bottom: 1px solid rgba(255,255,255,0.05);
}
.solution-feature-list li:last-child { border-bottom: none; }
.solution-feature-list li i {
  color: var(--accent);
  font-size: 0.8rem;
  margin-top: 5px;
}

/* Data section */
.data-section {
  background: linear-gradient(180deg, rgba(27,109,224,0.06), rgba(25,200,180,0.03)), var(--bg-dark);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.data-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-bottom: 1.2rem;
}
.data-item {
  text-align: center;
  padding: clamp(1.5rem, 2.5vw, 2.4rem) 1rem;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: var(--transition);
}
.data-item:hover {
  border-color: rgba(25,200,180,0.3);
  transform: translateY(-3px);
}
.data-number {
  font-size: clamp(2rem, 3vw, 2.6rem);
  font-weight: 700;
  background: linear-gradient(135deg, #4A9FFF, var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 0.4rem;
}
.data-label {
  color: var(--text-secondary);
  font-size: 0.9rem;
}
.data-note {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.82rem;
  margin-top: 0.5rem;
}

/* Latest section */
.latest-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.latest-card {
  display: flex;
  align-items: stretch;
  gap: 20px;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  transition: var(--transition);
}
.latest-card:hover {
  background: rgba(255,255,255,0.05);
  border-color: rgba(25,200,180,0.35);
  transform: translateX(4px);
  box-shadow: 0 8px 30px rgba(0,0,0,0.2);
}
.latest-cover {
  width: 150px;
  min-width: 150px;
  border-radius: 12px;
  overflow: hidden;
  aspect-ratio: 16/10;
  background: var(--bg-card);
}
.latest-cover img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.latest-card:hover .latest-cover img { transform: scale(1.04); }
.latest-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-width: 0;
}
.latest-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 6px;
  flex-wrap: wrap;
}
.pill {
  display: inline-flex;
  align-items: center;
  padding: 3px 12px;
  border-radius: 999px;
  background: rgba(27,109,224,0.18);
  border: 1px solid rgba(27,109,224,0.4);
  color: #6FB0FF;
  font-size: 0.78rem;
  font-weight: 500;
}
.time {
  color: var(--text-muted);
  font-size: 0.8rem;
}
.latest-body h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 6px;
  line-height: 1.45;
}
.latest-body h3 a { color: var(--text-main); }
.latest-body h3 a:hover { color: var(--accent); }
.latest-body p {
  color: var(--text-secondary);
  font-size: 0.88rem;
  line-height: 1.65;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.empty-state {
  border: 1px dashed rgba(255,255,255,0.2);
  border-radius: var(--radius);
  padding: 3rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.92rem;
  background: rgba(255,255,255,0.02);
}

/* CTA banner */
.cta-banner {
  margin-top: clamp(2rem, 4vw, 3rem);
  background: linear-gradient(135deg, rgba(27,109,224,0.15), rgba(25,200,180,0.1)), rgba(255,255,255,0.03);
  border: 1px solid rgba(25,200,180,0.25);
  border-radius: var(--radius);
  padding: clamp(1.8rem, 3.5vw, 3rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  position: relative;
  overflow: hidden;
}
.cta-banner::before {
  content: "";
  position: absolute;
  top: -50%; right: -20%;
  width: 300px; height: 300px;
  background: radial-gradient(circle, rgba(25,200,180,0.15), transparent 70%);
  pointer-events: none;
}
.cta-text h3 {
  font-size: clamp(1.3rem, 2vw, 1.7rem);
  font-weight: 700;
  margin-bottom: 6px;
}
.cta-text p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  max-width: 500px;
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.65);
  z-index: 2000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
  backdrop-filter: blur(4px);
}
.modal-overlay.open { display: flex; }
.modal {
  background: linear-gradient(160deg, #0F2437, #0B1B2B);
  border: 1px solid var(--border);
  border-radius: 20px;
  width: 92%;
  max-width: 480px;
  padding: clamp(1.6rem, 3vw, 2.4rem);
  position: relative;
  box-shadow: 0 30px 80px rgba(0,0,0,0.5);
}
.modal-close {
  position: absolute;
  top: 16px; right: 16px;
  width: 36px; height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-secondary);
  font-size: 0.9rem;
  transition: var(--transition);
}
.modal-close:hover { color: #fff; border-color: rgba(255,255,255,0.3); }
.modal h4 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 4px;
}
.modal .modal-sub {
  color: var(--text-secondary);
  font-size: 0.88rem;
  margin-bottom: 1.6rem;
}
.form-group { margin-bottom: 1.2rem; }
.form-group label {
  display: block;
  font-size: 0.86rem;
  color: var(--text-secondary);
  margin-bottom: 6px;
  font-weight: 500;
}
.form-group input,
.form-group select {
  width: 100%;
  padding: 12px 14px;
  background: rgba(255,255,255,0.06);
  border: 1px solid #3B5A77;
  border-radius: var(--radius-sm);
  color: var(--text-main);
  font-size: 0.92rem;
  transition: var(--transition);
  outline: none;
  appearance: none;
}
.form-group select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%2393A9C2' stroke-width='1.5' fill='none'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
}
.form-group input:focus,
.form-group select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(25,200,180,0.15);
}
.form-group input::placeholder { color: var(--text-muted); }
.modal .btn-primary { width: 100%; justify-content: center; margin-top: 0.5rem; }
.modal-privacy {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.78rem;
  margin-top: 1rem;
}

/* FAQ */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.faq-item {
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  transition: var(--transition);
}
.faq-item.active { border-color: rgba(25,200,180,0.4); }
.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 22px;
  text-align: left;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-main);
  transition: var(--transition);
}
.faq-question:hover { color: var(--accent); }
.faq-icon {
  width: 28px; height: 28px;
  border-radius: 50%;
  border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.9rem;
  color: var(--text-secondary);
  flex-shrink: 0;
  transition: transform 0.3s ease;
}
.faq-item.active .faq-icon { transform: rotate(45deg); border-color: rgba(25,200,180,0.4); color: var(--accent); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
}
.faq-answer-inner {
  padding: 0 22px 20px;
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.7;
}

/* Footer */
.site-footer {
  background: #081524;
  border-top: 1px solid var(--border);
  padding: clamp(2.5rem, 5vw, 4.5rem) 0 1.5rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 2.5rem;
}
.footer-col .footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}
.footer-col .footer-logo .logo-text { font-size: 1.2rem; }
.footer-desc {
  color: var(--text-muted);
  font-size: 0.88rem;
  line-height: 1.7;
  max-width: 320px;
}
.footer-col h4 {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 16px;
}
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul a {
  color: var(--text-secondary);
  font-size: 0.88rem;
  transition: var(--transition);
}
.footer-col ul a:hover { color: var(--accent); padding-left: 4px; }
.footer-contact li {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-secondary);
  font-size: 0.88rem;
  margin-bottom: 12px;
}
.footer-contact li i { color: var(--accent); width: 16px; text-align: center; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding-top: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  color: var(--text-muted);
  font-size: 0.8rem;
}

/* Back to top */
.back-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 46px; height: 46px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border: none;
  color: #fff;
  font-size: 1rem;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 6px 20px rgba(27,109,224,0.4);
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 900;
}
.back-top.show { opacity: 1; visibility: visible; }
.back-top:hover { transform: translateY(-3px); box-shadow: 0 0 26px rgba(25,200,180,0.5); }

/* Responsive */
@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
  .solution-grid { grid-template-columns: 1fr 1fr; }
  .solution-card.featured { grid-row: auto; }
  .data-grid { grid-template-columns: repeat(2, 1fr); }
  .nav-tabs { gap: 4px; }
  .tab { padding: 7px 12px; font-size: 0.84rem; }
}
@media (max-width: 768px) {
  .nav-tabs { display: none; }
  .hamburger { display: flex; }
  .nav-cta { display: none; }
  .hero-grid { grid-template-columns: 1fr; }
  .hero-content { text-align: center; max-width: 100%; }
  .hero-subtitle { margin-left: auto; margin-right: auto; }
  .hero-actions { justify-content: center; }
  .hero-stats { justify-content: center; }
  .pain-grid { grid-template-columns: 1fr; gap: 16px; }
  .solution-grid { grid-template-columns: 1fr; }
  .cta-banner { flex-direction: column; text-align: center; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .section-header { flex-direction: column; align-items: flex-start; gap: 12px; }
  .latest-card { flex-direction: column; }
  .latest-cover { width: 100%; min-width: 0; }
  .mobile-nav { display: block; }
  .mobile-nav:not(.open) { display: none; }
}
@media (max-width: 640px) {
  .hero { padding-top: calc(72px + 2.5rem); }
  .data-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .data-number { font-size: 1.8rem; }
  .btn-primary, .btn-secondary { padding: 12px 22px; }
  .modal { width: 100%; }
  .footer-bottom { justify-content: center; text-align: center; }
}
@media (min-width: 769px) {
  .mobile-nav { display: none !important; }
}

/* roulang page: category1 */
:root {
  --bg-primary: #0B1B2B;
  --bg-secondary: #0E2233;
  --bg-card: rgba(255,255,255,0.04);
  --bg-card-solid: #11243A;
  --accent-blue: #1B6DE0;
  --accent-teal: #19C8B4;
  --text-primary: #E6F0FA;
  --text-secondary: #93A9C2;
  --text-muted: #6B7F99;
  --border-light: rgba(255,255,255,0.08);
  --border-glow: rgba(25,200,180,0.4);
  --radius-lg: 16px;
  --radius-sm: 8px;
  --radius-pill: 24px;
  --shadow-normal: 0 8px 30px rgba(0,0,0,0.25);
  --shadow-hover: 0 14px 40px rgba(0,0,0,0.4);
  --space-section: clamp(4rem, 8vw, 7rem);
  --space-inner: clamp(1.2rem, 2.4vw, 2rem);
  --font-hero: clamp(2rem, 3.6vw, 3rem);
  --font-h2: clamp(1.5rem, 2.2vw, 2rem);
  --font-h3: 1.1rem;
  --font-body: 1rem;
  --font-small: 0.875rem;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  font-size: var(--font-body);
  line-height: 1.75;
  color: var(--text-primary);
  background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  display: block;
  object-fit: cover;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.3s ease, border-color 0.3s ease, background-color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
}

ul, ol {
  list-style: none;
}

input, button, select, textarea {
  font-family: inherit;
  font-size: inherit;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding-left: clamp(1rem, 4vw, 2rem);
  padding-right: clamp(1rem, 4vw, 2rem);
}

.section-block {
  padding: var(--space-section) 0;
}

/* ========== 头部导航 ========== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11, 27, 43, 0.82);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-light);
  transition: height 0.3s ease, background 0.3s ease;
  height: 72px;
}

.site-header.scrolled {
  height: 60px;
  background: rgba(8, 21, 36, 0.92);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.logo-mark {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-teal));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  font-weight: 700;
  color: #fff;
  box-shadow: 0 4px 14px rgba(27, 109, 224, 0.35);
}

.logo-text {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.nav-tabs {
  display: flex;
  align-items: center;
  gap: 8px;
}

.tab {
  padding: 8px 18px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-light);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  white-space: nowrap;
  transition: all 0.3s ease;
  background: transparent;
}

.tab:hover {
  color: var(--text-primary);
  border-color: rgba(255,255,255,0.18);
  background: rgba(255,255,255,0.04);
}

.tab.active {
  color: #fff;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-teal));
  border-color: transparent;
  box-shadow: 0 4px 20px rgba(27,109,224,0.35);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 26px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 500;
  border: 1px solid transparent;
  cursor: pointer;
  text-align: center;
  transition: all 0.3s ease;
  line-height: 1.4;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-teal));
  color: #fff;
  box-shadow: 0 6px 20px rgba(27,109,224,0.3);
}

.btn-primary:hover {
  box-shadow: 0 0 24px rgba(25,200,180,0.45);
  filter: brightness(1.05);
  color: #fff;
}

.btn-primary:active {
  transform: translateY(1px);
  box-shadow: 0 2px 12px rgba(25,200,180,0.35);
}

.btn-outline {
  background: transparent;
  border-color: rgba(255,255,255,0.25);
  color: var(--text-primary);
}

.btn-outline:hover {
  border-color: var(--accent-teal);
  color: var(--accent-teal);
  background: rgba(25,200,180,0.08);
}

.nav-cta {
  padding: 10px 22px;
  flex-shrink: 0;
}

.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border-light);
  color: var(--text-primary);
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  font-size: 1.1rem;
  cursor: pointer;
  align-items: center;
  justify-content: center;
}

.nav-toggle:hover {
  border-color: var(--accent-teal);
  color: var(--accent-teal);
}

/* ========== 面包屑 ========== */
.breadcrumb-bar {
  padding: 14px 0;
  border-bottom: 1px solid var(--border-light);
  background: rgba(11, 27, 43, 0.6);
}

.breadcrumb-bar .container {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.breadcrumb-bar a:hover {
  color: var(--accent-teal);
}

.breadcrumb-bar .current {
  color: var(--text-primary);
}

.breadcrumb-bar .sep {
  color: var(--text-muted);
  opacity: 0.6;
}

/* ========== 页面 Hero ========== */
.page-hero {
  position: relative;
  padding: clamp(4rem, 8vw, 7rem) 0;
  text-align: center;
  background:
    radial-gradient(ellipse 60% 60% at 20% 20%, rgba(27,109,224,0.3), transparent 60%),
    radial-gradient(ellipse 50% 50% at 80% 80%, rgba(25,200,180,0.2), transparent 60%),
    linear-gradient(135deg, rgba(11,27,43,0.92), rgba(14,34,51,0.85)),
    url('/assets/images/backpic/back-1.png') center/cover no-repeat;
  border-bottom: 1px solid var(--border-light);
}

.page-hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='40' height='40' viewBox='0 0 40 40' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M0 0h1v40H0zM40 0h1v40h-1zM0 0v1h40V0zM0 40v1h40v-1z' fill='none' stroke='rgba(255,255,255,0.04)' stroke-width='1'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 1;
}

.page-hero .container {
  position: relative;
  z-index: 2;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  border-radius: var(--radius-pill);
  background: rgba(25,200,180,0.12);
  border: 1px solid rgba(25,200,180,0.3);
  color: var(--accent-teal);
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 1.5rem;
}

.hero-badge::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-teal);
  box-shadow: 0 0 8px rgba(25,200,180,0.6);
}

.page-hero h1 {
  font-size: var(--font-hero);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.3;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.page-hero .hero-sub {
  font-size: clamp(1rem, 1.4vw, 1.15rem);
  color: var(--text-secondary);
  max-width: 620px;
  margin: 0 auto 2rem;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

/* ========== 平台服务全景 ========== */
.service-overview {
  position: relative;
}

.section-head {
  text-align: center;
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
}

.section-head .eyebrow {
  display: inline-block;
  font-size: 0.875rem;
  color: var(--accent-teal);
  font-weight: 500;
  margin-bottom: 0.75rem;
  letter-spacing: 0.02em;
}

.section-head h2 {
  font-size: var(--font-h2);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.section-head p {
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto;
  font-size: 1rem;
}

.overview-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
}

.overview-main-card {
  flex: 1 1 48%;
  min-width: 320px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-normal);
  transition: transform 0.35s ease, box-shadow 0.35s ease, border-color 0.35s ease;
  height: fit-content;
}

.overview-main-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: var(--border-glow);
}

.overview-main-card .card-img {
  height: 220px;
  overflow: hidden;
}

.overview-main-card .card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.overview-main-card:hover .card-img img {
  transform: scale(1.04);
}

.overview-main-card .card-body {
  padding: var(--space-inner);
}

.overview-main-card .card-body h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.overview-main-card .card-body p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.overview-side-grid {
  flex: 1 1 46%;
  min-width: 320px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.small-card {
  border-radius: var(--radius-lg);
  padding: var(--space-inner);
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border-light);
  transition: all 0.35s ease;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.small-card:hover {
  transform: translateY(-4px);
  background: rgba(255,255,255,0.06);
  border-color: var(--border-glow);
  box-shadow: var(--shadow-hover);
}

.small-card .card-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(27,109,224,0.2), rgba(25,200,180,0.2));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: var(--accent-teal);
  border: 1px solid rgba(25,200,180,0.25);
}

.small-card h4 {
  font-size: var(--font-h3);
  font-weight: 600;
  margin-bottom: 4px;
}

.small-card p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.small-card .card-thumb {
  width: 100%;
  height: 90px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin-top: auto;
}

.small-card .card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ========== 核心服务能力 ========== */
.core-features {
  background: rgba(11, 27, 43, 0.5);
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.feature-item {
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 2rem 1.5rem;
  text-align: center;
  transition: all 0.35s ease;
}

.feature-item:hover {
  background: rgba(255,255,255,0.06);
  border-color: var(--border-glow);
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
}

.feature-icon {
  width: 60px;
  height: 60px;
  margin: 0 auto 1.25rem;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-teal));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  color: #fff;
  box-shadow: 0 6px 20px rgba(27,109,224,0.35);
}

.feature-item h3 {
  font-size: var(--font-h3);
  font-weight: 600;
  margin-bottom: 0.6rem;
}

.feature-item p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ========== 适用场景 ========== */
.use-case-layout {
  display: flex;
  flex-wrap: wrap;
  gap: 32px;
  align-items: center;
}

.use-case-media {
  flex: 1 1 45%;
  min-width: 300px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-normal);
  position: relative;
}

.use-case-media img {
  width: 100%;
  height: 320px;
  object-fit: cover;
}

.use-case-media::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(11,27,43,0.2), transparent 60%);
}

.use-case-list {
  flex: 1 1 45%;
  min-width: 300px;
}

.use-case-item {
  display: flex;
  gap: 18px;
  padding: 20px 0;
  border-bottom: 1px solid var(--border-light);
  transition: padding-left 0.3s ease;
}

.use-case-item:last-child {
  border-bottom: none;
}

.use-case-item:hover {
  padding-left: 8px;
}

.use-case-num {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(25,200,180,0.1);
  border: 1px solid rgba(25,200,180,0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  color: var(--accent-teal);
}

.use-case-item h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.use-case-item p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ========== 服务流程 ========== */
.service-flow {
  background: rgba(11, 27, 43, 0.5);
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
}

.flow-steps {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
  position: relative;
}

.flow-step {
  flex: 1 1 200px;
  max-width: 240px;
  text-align: center;
  padding: 2rem 1.5rem;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  position: relative;
  transition: all 0.35s ease;
}

.flow-step:hover {
  border-color: var(--border-glow);
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
}

.step-number {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-teal));
  color: #fff;
  font-weight: 700;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1rem;
  box-shadow: 0 4px 16px rgba(27,109,224,0.3);
}

.step-icon {
  font-size: 1.6rem;
  color: var(--accent-teal);
  margin-bottom: 0.75rem;
}

.flow-step h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.flow-step p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ========== FAQ ========== */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  border-radius: 12px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border-light);
  overflow: hidden;
  transition: border-color 0.3s ease;
}

.faq-item:hover {
  border-color: rgba(255,255,255,0.14);
}

.faq-item.active {
  border-color: var(--border-glow);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 1.1rem 1.4rem;
  cursor: pointer;
  font-weight: 500;
  font-size: 1rem;
  background: transparent;
  border: none;
  color: var(--text-primary);
  text-align: left;
  width: 100%;
  font-family: inherit;
}

.faq-question:hover {
  color: var(--accent-teal);
}

.faq-toggle {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  transition: transform 0.3s ease;
  color: var(--text-secondary);
}

.faq-item.active .faq-toggle {
  transform: rotate(45deg);
  background: rgba(25,200,180,0.15);
  border-color: var(--accent-teal);
  color: var(--accent-teal);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
  padding: 0 1.4rem;
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding: 0 1.4rem 1.2rem;
}

.faq-answer p {
  color: var(--text-secondary);
  font-size: 0.925rem;
  line-height: 1.75;
}

/* ========== CTA 横幅 ========== */
.cta-banner {
  padding: clamp(3rem, 6vw, 5rem) 0;
  background: radial-gradient(ellipse 50% 70% at 50% 100%, rgba(25,200,180,0.15), transparent 70%),
              radial-gradient(ellipse 40% 50% at 20% 0%, rgba(27,109,224,0.2), transparent 60%),
              var(--bg-primary);
  border-top: 1px solid var(--border-light);
}

.cta-inner {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
}

.cta-inner h2 {
  font-size: var(--font-h2);
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.cta-inner p {
  color: var(--text-secondary);
  font-size: 1rem;
  margin-bottom: 2rem;
}

/* ========== 页脚 ========== */
.site-footer {
  background: #081524;
  border-top: 1px solid var(--border-light);
  padding: 3.5rem 0 1.5rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1.2fr;
  gap: 32px;
  margin-bottom: 2.5rem;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 1rem;
}

.footer-desc {
  color: var(--text-muted);
  font-size: 0.875rem;
  line-height: 1.7;
  max-width: 320px;
}

.footer-col h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.footer-col ul li {
  margin-bottom: 0.6rem;
}

.footer-col ul li a {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.footer-col ul li a:hover {
  color: var(--accent-teal);
}

.footer-contact li {
  color: var(--text-secondary);
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer-contact i {
  color: var(--accent-teal);
  width: 16px;
  text-align: center;
}

.footer-bottom {
  border-top: 1px solid var(--border-light);
  padding-top: 1.5rem;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .overview-side-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .use-case-layout {
    flex-direction: column-reverse;
  }
}

@media (max-width: 768px) {
  .site-header {
    height: 60px;
    background: rgba(8, 21, 36, 0.95);
  }

  .nav-toggle {
    display: flex;
  }

  .nav-tabs {
    display: none;
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(8, 21, 36, 0.98);
    border-bottom: 1px solid var(--border-light);
    padding: 16px 24px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.4);
    z-index: 99;
    align-items: stretch;
  }

  .nav-tabs.open {
    display: flex;
  }

  .tab {
    border-radius: 10px;
    padding: 12px 16px;
    border: none;
    border-bottom: 1px solid var(--border-light);
  }

  .nav-cta {
    display: none;
  }

  .overview-main-card {
    flex-basis: 100%;
  }

  .overview-side-grid {
    flex-basis: 100%;
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 520px) {
  .page-hero {
    padding: 3rem 0;
  }

  .overview-side-grid {
    grid-template-columns: 1fr;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .flow-steps {
    flex-direction: column;
    align-items: center;
  }

  .flow-step {
    width: 100%;
    max-width: 360px;
  }

  .hero-actions .btn {
    width: 100%;
    max-width: 280px;
  }

  .footer-contact li {
    flex-wrap: wrap;
  }
}

/* roulang page: article */
:root {
    --color-bg: #0B1B2B;
    --color-bg-alt: #0E2233;
    --color-card: #11243A;
    --color-primary: #1B6DE0;
    --color-accent: #19C8B4;
    --color-text: #E6F0FA;
    --color-text-sub: #93A9C2;
    --color-text-muted: #6B7F99;
    --color-border: rgba(255,255,255,0.08);
    --color-border-hover: rgba(25,200,180,0.4);
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-pill: 999px;
    --shadow-sm: 0 8px 30px rgba(0,0,0,0.25);
    --shadow-lg: 0 14px 40px rgba(0,0,0,0.4);
    --font-main: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
    --container-width: 1200px;
    --space-section: clamp(4rem, 8vw, 7rem);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font-main);
    background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-alt) 100%);
    background-attachment: fixed;
    color: var(--color-text);
    line-height: 1.75;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--color-text); text-decoration: none; transition: color 0.25s ease; }
a:hover { color: var(--color-accent); }
ul, ol { list-style: none; }
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 clamp(1rem, 4vw, 2rem);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    height: 48px;
    padding: 0 28px;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 500;
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
    line-height: 1;
}
.btn i { font-size: 0.9rem; }
.btn-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    color: #fff;
    box-shadow: 0 6px 20px rgba(27,109,224,0.3);
}
.btn-primary:hover {
    box-shadow: 0 0 24px rgba(25,200,180,0.45);
    color: #fff;
    transform: translateY(-2px);
}
.btn-primary:active { transform: translateY(1px); box-shadow: none; }
.btn-secondary {
    background: transparent;
    border-color: rgba(255,255,255,0.18);
    color: var(--color-text);
}
.btn-secondary:hover {
    border-color: var(--color-accent);
    background: rgba(25,200,180,0.08);
    color: var(--color-accent);
}
.btn-secondary:active { transform: translateY(1px); }
.btn-sm { height: 40px; padding: 0 20px; font-size: 0.875rem; }

.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 14px;
    border-radius: var(--radius-pill);
    border: 1px solid rgba(27,109,224,0.5);
    color: #BFD9FF;
    background: rgba(27,109,224,0.15);
    font-size: 0.8rem;
    line-height: 1.6;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(11,27,43,0.82);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--color-border);
    transition: all 0.35s ease;
}
.site-header.scrolled {
    background: rgba(8,21,36,0.92);
    box-shadow: 0 10px 40px rgba(0,0,0,0.35);
}
.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    height: 72px;
    transition: height 0.3s ease;
}
.site-header.scrolled .header-inner { height: 60px; }
.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}
.logo-mark {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.9rem;
    color: #fff;
    letter-spacing: -0.02em;
    box-shadow: 0 0 18px rgba(25,200,180,0.25);
}
.logo-text {
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    color: var(--color-text);
}
.nav-tabs {
    display: flex;
    align-items: center;
    gap: 10px;
}
.nav-tabs .tab {
    display: inline-flex;
    align-items: center;
    padding: 8px 18px;
    border-radius: var(--radius-pill);
    border: 1px solid transparent;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-sub);
    transition: all 0.3s ease;
    white-space: nowrap;
}
.nav-tabs .tab:hover {
    border-color: rgba(25,200,180,0.35);
    color: var(--color-text);
    background: rgba(25,200,180,0.06);
}
.nav-tabs .tab.active {
    background: linear-gradient(135deg, rgba(27,109,224,0.25), rgba(25,200,180,0.18));
    border-color: rgba(25,200,180,0.35);
    color: #fff;
    box-shadow: 0 0 20px rgba(25,200,180,0.12);
}
.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}
.nav-toggle {
    display: none;
    width: 42px;
    height: 42px;
    border-radius: 10px;
    border: 1px solid var(--color-border);
    background: rgba(255,255,255,0.04);
    color: var(--color-text);
    font-size: 1.1rem;
    cursor: pointer;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}
.nav-toggle:hover { border-color: var(--color-accent); color: var(--color-accent); }
.mobile-menu {
    display: none;
    flex-direction: column;
    padding: 16px 20px 24px;
    gap: 6px;
    border-top: 1px solid var(--color-border);
}
.mobile-menu a {
    padding: 12px 16px;
    border-radius: 10px;
    font-size: 0.95rem;
    color: var(--color-text-sub);
}
.mobile-menu a.active {
    background: rgba(25,200,180,0.1);
    color: var(--color-accent);
}
.mobile-menu a:hover { background: rgba(255,255,255,0.05); color: var(--color-text); }
.mobile-menu.open { display: flex; }

.page-banner {
    position: relative;
    padding: 40px 0 30px;
    border-bottom: 1px solid var(--color-border);
    background-image: url('/assets/images/backpic/back-2.webp');
    background-size: cover;
    background-position: center;
    background-color: var(--color-bg);
}
.page-banner::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, rgba(11,27,43,0.92) 0%, rgba(11,27,43,0.72) 100%);
}
.breadcrumb {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    font-size: 0.875rem;
    color: var(--color-text-sub);
}
.breadcrumb a { color: var(--color-text-sub); }
.breadcrumb a:hover { color: var(--color-accent); }
.breadcrumb .sep { color: var(--color-text-muted); }
.breadcrumb .current {
    display: inline-block;
    max-width: 280px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    color: var(--color-text);
    vertical-align: bottom;
}

.article-main {
    padding: clamp(2.5rem, 5vw, 4.5rem) 0;
}
.article-card {
    max-width: 780px;
    margin: 0 auto;
    background: rgba(255,255,255,0.03);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: clamp(1.5rem, 4vw, 3rem);
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}
.article-header {
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--color-border);
}
.article-header h1 {
    font-size: clamp(1.6rem, 3vw, 2.3rem);
    font-weight: 700;
    line-height: 1.4;
    letter-spacing: -0.01em;
    margin-bottom: 1rem;
    color: var(--color-text);
}
.article-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 16px;
    font-size: 0.85rem;
    color: var(--color-text-sub);
}
.article-meta i { margin-right: 5px; color: var(--color-text-muted); }
.article-meta .badge i { margin-right: 5px; }
.article-content {
    font-size: 1rem;
    line-height: 1.9;
    color: #C8DBEC;
}
.article-content p { margin-bottom: 1.4em; }
.article-content h2 {
    font-size: 1.4rem;
    font-weight: 600;
    margin: 1.8em 0 0.8em;
    color: var(--color-text);
}
.article-content h3 {
    font-size: 1.15rem;
    font-weight: 600;
    margin: 1.6em 0 0.6em;
    color: var(--color-text);
}
.article-content h4 {
    font-size: 1rem;
    font-weight: 600;
    margin: 1.4em 0 0.5em;
    color: var(--color-text);
}
.article-content ul,
.article-content ol {
    margin: 0 0 1.5em 1.5em;
    padding: 0;
}
.article-content ul { list-style: disc; }
.article-content ol { list-style: decimal; }
.article-content li { margin-bottom: 0.4em; }
.article-content a { color: var(--color-accent); text-decoration: underline; }
.article-content a:hover { color: #7ef0e3; }
.article-content blockquote {
    margin: 1.5em 0;
    padding: 1rem 1.5rem;
    border-left: 3px solid var(--color-accent);
    background: rgba(25,200,180,0.06);
    border-radius: 0 10px 10px 0;
    color: var(--color-text-sub);
    font-style: normal;
}
.article-content img {
    border-radius: 12px;
    margin: 1.8em 0;
    box-shadow: var(--shadow-sm);
}
.article-content code {
    background: rgba(27,109,224,0.2);
    border-radius: 6px;
    padding: 2px 8px;
    font-size: 0.9em;
    color: #BFD9FF;
}
.article-content pre {
    background: #081524;
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 1.2rem;
    overflow-x: auto;
    margin-bottom: 1.5em;
}
.article-content pre code { background: transparent; padding: 0; color: var(--color-text); }
.article-content hr {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: 2em 0;
}
.article-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 2.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--color-border);
}
.article-not-found {
    text-align: center;
    padding: 3rem 1rem;
}
.article-not-found i {
    font-size: 3rem;
    color: var(--color-text-muted);
    margin-bottom: 1.2rem;
}
.article-not-found h1 {
    font-size: 1.6rem;
    margin-bottom: 0.8rem;
}
.article-not-found p {
    color: var(--color-text-sub);
    margin-bottom: 1.5rem;
}

.related-section {
    padding: var(--space-section) 0 clamp(3rem, 5vw, 4rem);
    border-top: 1px solid var(--color-border);
}
.section-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 2rem;
}
.section-head h2 {
    font-size: clamp(1.4rem, 2vw, 1.8rem);
    font-weight: 600;
    letter-spacing: -0.01em;
}
.more-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.875rem;
    color: var(--color-text-sub);
    transition: all 0.3s ease;
}
.more-link:hover { color: var(--color-accent); }
.more-link i { transition: transform 0.3s ease; }
.more-link:hover i { transform: translateX(4px); }
.related-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.related-card {
    display: flex;
    flex-direction: column;
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: all 0.3s ease;
    box-shadow: 0 4px 16px rgba(0,0,0,0.15);
}
.related-card:hover {
    background: rgba(255,255,255,0.06);
    border-color: var(--color-border-hover);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}
.related-thumb {
    position: relative;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background: var(--color-card);
}
.related-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.45s ease;
}
.related-card:hover .related-thumb img { transform: scale(1.04); }
.related-thumb::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 55%, rgba(11,27,43,0.5));
}
.related-body {
    padding: 1.2rem 1.4rem 1.4rem;
    display: flex;
    flex-direction: column;
}
.related-body .badge {
    align-self: flex-start;
    margin-bottom: 10px;
}
.related-body h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 8px;
    line-height: 1.5;
    color: var(--color-text);
}
.related-body p {
    font-size: 0.85rem;
    color: var(--color-text-sub);
    line-height: 1.6;
    margin-bottom: 0;
}

.cta-section {
    padding: var(--space-section) 0;
    border-top: 1px solid var(--color-border);
}
.cta-inner {
    position: relative;
    background: linear-gradient(135deg, rgba(27,109,224,0.18), rgba(25,200,180,0.12));
    border: 1px solid rgba(25,200,180,0.25);
    border-radius: 20px;
    padding: clamp(2rem, 4vw, 3.5rem);
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    overflow: hidden;
}
.cta-inner::before {
    content: "";
    position: absolute;
    width: 260px;
    height: 260px;
    border-radius: 50%;
    background: rgba(25,200,180,0.12);
    filter: blur(70px);
    top: -80px;
    right: -40px;
    pointer-events: none;
}
.cta-text { position: relative; z-index: 1; max-width: 540px; }
.cta-text h3 {
    font-size: clamp(1.3rem, 2vw, 1.7rem);
    font-weight: 600;
    margin-bottom: 10px;
}
.cta-text p { color: var(--color-text-sub); font-size: 0.95rem; margin-bottom: 0; }
.cta-inner .btn { position: relative; z-index: 1; flex-shrink: 0; }

.site-footer {
    background: #081524;
    border-top: 1px solid var(--color-border);
    padding: clamp(3rem, 6vw, 5rem) 0 2rem;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1.4fr;
    gap: 40px;
    margin-bottom: 3rem;
}
.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 14px;
}
.footer-logo .logo-mark {
    width: 32px;
    height: 32px;
    font-size: 0.8rem;
    border-radius: 8px;
}
.footer-logo .logo-text {
    font-size: 1.1rem;
    font-weight: 700;
}
.footer-desc {
    color: var(--color-text-muted);
    font-size: 0.875rem;
    line-height: 1.75;
    max-width: 340px;
    margin-bottom: 0;
}
.footer-col h4 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 14px;
    letter-spacing: 0.02em;
}
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul a {
    color: var(--color-text-muted);
    font-size: 0.875rem;
    transition: color 0.25s ease;
}
.footer-col ul a:hover { color: var(--color-accent); }
.footer-contact li {
    color: var(--color-text-muted);
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: 8px;
}
.footer-contact i {
    width: 18px;
    text-align: center;
    color: var(--color-primary);
}
.footer-bottom {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 12px;
    padding-top: 1.5rem;
    border-top: 1px solid var(--color-border);
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

@media (max-width: 1024px) {
    .nav-tabs .tab { padding: 8px 14px; font-size: 0.82rem; }
    .header-actions .btn-primary { display: none; }
    .nav-toggle { display: flex; }
    .nav-tabs { display: none; }
    .related-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    .article-card { padding: 1.5rem 1.2rem; }
    .article-actions { flex-direction: column; align-items: flex-start; gap: 12px; }
    .footer-grid { grid-template-columns: 1fr; gap: 28px; }
    .footer-col:first-child { order: 1; }
    .footer-col:nth-child(2) { order: 2; }
    .footer-col:nth-child(3) { order: 3; }
    .footer-bottom { flex-direction: column; }
}

@media (max-width: 640px) {
    .header-inner { height: 64px; }
    .site-header.scrolled .header-inner { height: 56px; }
    .logo-text { font-size: 1.05rem; }
    .page-banner { padding: 28px 0 20px; }
    .related-grid { grid-template-columns: 1fr; }
    .cta-inner { flex-direction: column; align-items: flex-start; }
    .article-meta { gap: 10px; font-size: 0.8rem; }
    .article-content { font-size: 0.95rem; line-height: 1.8; }
}

@media (max-width: 480px) {
    .breadcrumb .current { max-width: 160px; }
    .article-card { padding: 1.2rem 1rem; }
}

/* roulang page: category3 */
:root {
  --primary: #0B1B2B;
  --primary-light: #0E2233;
  --accent: #1B6DE0;
  --accent2: #19C8B4;
  --text: #E6F0FA;
  --text-secondary: #93A9C2;
  --text-muted: #6B7F99;
  --border-color: rgba(255,255,255,0.08);
  --border-hover: rgba(25,200,180,0.4);
  --card-bg: rgba(255,255,255,0.04);
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --shadow-md: 0 8px 30px rgba(0,0,0,0.25);
  --shadow-lg: 0 14px 40px rgba(0,0,0,0.4);
  --transition-normal: all 0.3s ease;
  --container-max: 1200px;
  --space-section: clamp(4rem, 8vw, 7rem);
}
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
}
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  background: linear-gradient(135deg, #0B1B2B 0%, #0E2233 50%, #0D1E2E 100%);
  color: var(--text);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  min-height: 100vh;
}
img {
  max-width: 100%;
  display: block;
}
a {
  color: var(--text);
  text-decoration: none;
  transition: var(--transition-normal);
}
button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}
input, select, textarea {
  font-family: inherit;
  font-size: 1rem;
  color: var(--text);
}
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 clamp(1rem, 4vw, 2rem);
}

/* ===== Header Nav ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 999;
  background: rgba(11, 27, 43, 0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  height: 72px;
  display: flex;
  align-items: center;
  transition: height 0.3s ease, box-shadow 0.3s ease;
}
.site-header.scrolled {
  height: 60px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.3);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  width: 100%;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.logo-mark {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
  color: #fff;
  letter-spacing: 0;
  box-shadow: 0 0 16px rgba(25,200,180,0.3);
}
.logo-text {
  font-size: 1.28rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--text);
  white-space: nowrap;
}
.nav-tabs {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
  flex-wrap: nowrap;
}
.nav-tabs .tab {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  border-radius: 100px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  border: 1px solid transparent;
  transition: var(--transition-normal);
  white-space: nowrap;
}
.nav-tabs .tab:hover {
  color: var(--text);
  border-color: var(--border-color);
  background: rgba(255,255,255,0.04);
}
.nav-tabs .tab.active {
  color: #fff;
  background: linear-gradient(135deg, rgba(27,109,224,0.85), rgba(25,200,180,0.75));
  border-color: transparent;
  box-shadow: 0 0 16px rgba(25,200,180,0.25);
}
.nav-cta-wrap {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-shrink: 0;
}
.header-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  box-shadow: 0 2px 12px rgba(27,109,224,0.3);
  transition: var(--transition-normal);
}
.header-cta:hover {
  box-shadow: 0 0 20px rgba(25,200,180,0.45);
  transform: translateY(-1px);
  color: #fff;
}
.header-cta:active {
  transform: translateY(1px);
}
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  align-items: center;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background 0.2s;
}
.hamburger:hover {
  background: rgba(255,255,255,0.05);
}
.hamburger span {
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: var(--transition-normal);
}
.hamburger.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.hamburger.open span:nth-child(2) {
  opacity: 0;
}
.hamburger.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===== Mobile Menu ===== */
.mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 998;
  background: rgba(11,27,43,0.98);
  backdrop-filter: blur(20px);
  padding: 100px 32px 40px;
  flex-direction: column;
  gap: 10px;
  overflow-y: auto;
}
.mobile-menu.show {
  display: flex;
}
.mobile-menu a {
  padding: 16px 20px;
  border-radius: var(--radius-md);
  font-size: 1.05rem;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  transition: var(--transition-normal);
}
.mobile-menu a.active {
  color: #fff;
  background: linear-gradient(135deg, rgba(27,109,224,0.7), rgba(25,200,180,0.6));
  border-color: transparent;
}
.mobile-menu a:hover {
  color: var(--text);
  border-color: var(--border-hover);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 30px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  transition: var(--transition-normal);
  border: 1px solid transparent;
  cursor: pointer;
  line-height: 1.4;
}
.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  box-shadow: 0 4px 20px rgba(27,109,224,0.3);
}
.btn-primary:hover {
  box-shadow: 0 0 24px rgba(25,200,180,0.45);
  transform: translateY(-1px);
  color: #fff;
}
.btn-primary:active {
  transform: translateY(1px);
}
.btn-outline {
  color: var(--text);
  background: transparent;
  border-color: rgba(255,255,255,0.25);
}
.btn-outline:hover {
  border-color: var(--accent2);
  background: rgba(25,200,180,0.08);
  color: #fff;
}
.btn-lg {
  padding: 14px 40px;
  font-size: 1.05rem;
  border-radius: 12px;
}
.btn-full {
  width: 100%;
}

/* ===== Section Head ===== */
.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto clamp(2.5rem, 5vw, 4rem);
}
.section-tag {
  display: inline-block;
  padding: 6px 18px;
  border-radius: 100px;
  font-size: 0.82rem;
  font-weight: 600;
  color: #19C8B4;
  background: rgba(25,200,180,0.1);
  border: 1px solid rgba(25,200,180,0.25);
  letter-spacing: 0.03em;
  margin-bottom: 20px;
}
.section-head h2 {
  font-size: clamp(1.6rem, 2.4vw, 2.2rem);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.3;
  color: var(--text);
  margin-bottom: 14px;
}
.section-head p {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.7;
}
.section-head.light h2 {
  color: #fff;
}
.section-head.light p {
  color: rgba(255,255,255,0.75);
}

/* ===== Hero ===== */
.hero {
  position: relative;
  padding: clamp(3.5rem, 8vw, 6rem) 0;
  background: linear-gradient(135deg, #0B1B2B 0%, #0D2033 55%, #0E2A38 100%);
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -120px;
  right: -80px;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(27,109,224,0.18), transparent 65%);
  pointer-events: none;
}
.hero::after {
  content: '';
  position: absolute;
  bottom: -100px;
  left: 10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(25,200,180,0.1), transparent 60%);
  pointer-events: none;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
  position: relative;
  z-index: 2;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 18px;
  border-radius: 100px;
  font-size: 0.82rem;
  font-weight: 600;
  color: #19C8B4;
  background: rgba(25,200,180,0.08);
  border: 1px solid rgba(25,200,180,0.2);
  margin-bottom: 24px;
}
.hero-badge i {
  font-size: 0.75rem;
}
.hero h1 {
  font-size: clamp(2.2rem, 4vw, 3.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.18;
  color: var(--text);
  margin-bottom: 20px;
}
.hero h1 .highlight {
  color: var(--accent2);
  position: relative;
}
.hero-sub {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.8;
  max-width: 480px;
  margin-bottom: 32px;
}
.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 40px;
}
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}
.hero-meta span {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  background: rgba(255,255,255,0.04);
  padding: 7px 14px;
  border-radius: 100px;
  border: 1px solid var(--border-color);
}
.hero-meta span i {
  color: var(--accent2);
  font-size: 0.8rem;
}
.hero-image {
  position: relative;
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0,0,0,0.4);
  border: 1px solid rgba(255,255,255,0.1);
}
.hero-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  aspect-ratio: 4 / 3;
}
.hero-image::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(11,27,43,0.4), transparent 35%);
  pointer-events: none;
}

/* ===== Steps ===== */
.steps-section {
  padding: var(--space-section) 0;
  position: relative;
}
.steps-section .section-head {
  margin-bottom: clamp(2.5rem, 5vw, 3.5rem);
}
.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.step-card {
  position: relative;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 22px 26px;
  backdrop-filter: blur(12px);
  transition: var(--transition-normal);
  overflow: hidden;
}
.step-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  opacity: 0;
  transition: var(--transition-normal);
}
.step-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(25,200,180,0.3);
}
.step-card:hover::before {
  opacity: 1;
}
.step-num {
  font-size: 2.6rem;
  font-weight: 700;
  color: rgba(25,200,180,0.18);
  line-height: 1;
  margin-bottom: 18px;
  letter-spacing: -0.02em;
}
.step-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 10px;
}
.step-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ===== Feature Section ===== */
.feature-section {
  padding: var(--space-section) 0;
  background: linear-gradient(180deg, rgba(14,34,51,0.4), rgba(11,27,43,0.2));
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}
.feature-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.feature-image {
  border-radius: 20px;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-color);
  position: relative;
}
.feature-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  aspect-ratio: 16 / 11;
}
.feature-image::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(27,109,224,0.15), transparent 40%);
  pointer-events: none;
}
.feature-content .section-tag {
  margin-bottom: 14px;
}
.feature-content h2 {
  font-size: clamp(1.6rem, 2.4vw, 2rem);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.3;
  margin-bottom: 18px;
  color: var(--text);
}
.feature-content > p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 24px;
}
.feature-list {
  list-style: none;
  padding: 0;
  margin: 0 0 30px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.95rem;
  color: var(--text);
  line-height: 1.6;
}
.feature-list li i {
  color: var(--accent2);
  margin-top: 4px;
  font-size: 0.9rem;
  flex-shrink: 0;
}

/* ===== Feature Cards (masonry-ish) ===== */
.features-card-section {
  padding: var(--space-section) 0;
}
.cards-bento {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  grid-template-rows: auto;
  gap: 24px;
}
.feature-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: clamp(1.5rem, 2.5vw, 2.2rem);
  backdrop-filter: blur(12px);
  transition: var(--transition-normal);
  display: flex;
  flex-direction: column;
}
.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(25,200,180,0.35);
}
.feature-card.card-main {
  grid-row: span 2;
  justify-content: center;
  background: linear-gradient(135deg, rgba(27,109,224,0.15), rgba(25,200,180,0.08));
  border-color: rgba(25,200,180,0.2);
}
.feature-card i {
  font-size: 2.2rem;
  color: var(--accent2);
  margin-bottom: 20px;
  line-height: 1;
}
.feature-card h3 {
  font-size: 1.12rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 12px;
}
.feature-card p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 18px;
  flex-grow: 1;
}
.text-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent2);
  transition: var(--transition-normal);
}
.text-link:hover {
  gap: 10px;
  color: #35f0d8;
}

/* ===== Support Section ===== */
.support-section {
  padding: var(--space-section) 0;
  background: linear-gradient(135deg, #081A2A, #0D2436);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}
.support-inner {
  max-width: 920px;
  margin: 0 auto;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  padding: clamp(2.5rem, 5vw, 4rem) clamp(1.5rem, 4vw, 3rem);
}
.support-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  margin-top: 40px;
}
.support-item {
  text-align: center;
  padding: 24px 16px;
  border-radius: var(--radius-md);
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border-color);
  transition: var(--transition-normal);
}
.support-item:hover {
  border-color: rgba(25,200,180,0.3);
  background: rgba(25,200,180,0.05);
}
.support-item i {
  font-size: 2rem;
  color: var(--accent2);
  margin-bottom: 16px;
  display: block;
}
.support-item h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 8px;
}
.support-item p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ===== FAQ ===== */
.faq-section {
  padding: var(--space-section) 0;
}
.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.faq-item {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition-normal);
}
.faq-item:hover {
  border-color: rgba(25,200,180,0.25);
}
.faq-item.open {
  border-color: rgba(25,200,180,0.4);
  background: rgba(25,200,180,0.04);
}
.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 24px;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text);
  text-align: left;
  transition: var(--transition-normal);
  background: transparent;
}
.faq-question:hover {
  color: var(--accent2);
}
.faq-question i {
  flex-shrink: 0;
  color: var(--accent2);
  transition: transform 0.3s ease;
  font-size: 0.9rem;
}
.faq-item.open .faq-question i {
  transform: rotate(45deg);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
}
.faq-answer-inner {
  padding: 0 24px 20px;
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* ===== CTA ===== */
.cta-section {
  padding: 0 0 var(--space-section);
}
.cta-inner {
  background: linear-gradient(135deg, rgba(27,109,224,0.2), rgba(25,200,180,0.12));
  border: 1px solid rgba(25,200,180,0.2);
  border-radius: 24px;
  padding: clamp(2.5rem, 5vw, 4rem) clamp(1.5rem, 4vw, 3.5rem);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta-inner::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(25,200,180,0.2), transparent 70%);
  pointer-events: none;
}
.cta-inner h2 {
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  font-weight: 600;
  color: var(--text);
  margin-bottom: 14px;
}
.cta-inner p {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 520px;
  margin: 0 auto 28px;
  line-height: 1.7;
}

/* ===== Modal ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 1200;
  background: rgba(0,0,0,0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}
.modal-overlay.show {
  opacity: 1;
  visibility: visible;
}
.modal-box {
  width: 100%;
  max-width: 480px;
  background: linear-gradient(145deg, rgba(18,40,60,0.98), rgba(14,30,44,0.98));
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-lg);
  padding: 36px 32px 28px;
  position: relative;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}
.modal-close {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  background: rgba(255,255,255,0.05);
  transition: var(--transition-normal);
  font-size: 0.95rem;
}
.modal-close:hover {
  color: #fff;
  background: rgba(255,255,255,0.12);
}
.modal-box h3 {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 8px;
}
.modal-box > p:not(.privacy-note) {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
}
.modal-form {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.modal-form input,
.modal-form select {
  width: 100%;
  padding: 13px 16px;
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.06);
  border: 1px solid #3B5A77;
  color: var(--text);
  transition: var(--transition-normal);
  outline: none;
  appearance: none;
  -webkit-appearance: none;
}
.modal-form input:focus,
.modal-form select:focus {
  border-color: var(--accent2);
  box-shadow: 0 0 0 3px rgba(25,200,180,0.12);
}
.modal-form select option {
  background: #0E2233;
  color: var(--text);
}
.modal-form select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' fill='%2393A9C2' viewBox='0 0 12 8'%3E%3Cpath d='M6 8L0 0h12L6 8z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  cursor: pointer;
}
.privacy-note {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 16px;
  text-align: center;
  line-height: 1.6;
}

/* ===== Footer ===== */
.site-footer {
  background: #081524;
  border-top: 1px solid rgba(255,255,255,0.05);
  padding: clamp(3rem, 6vw, 4.5rem) 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.2fr;
  gap: 40px;
  padding-bottom: 32px;
}
.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}
.footer-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 320px;
}
.site-footer h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 18px;
  letter-spacing: 0.02em;
}
.site-footer ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.site-footer ul li a {
  font-size: 0.88rem;
  color: var(--text-secondary);
  transition: var(--transition-normal);
}
.site-footer ul li a:hover {
  color: var(--accent2);
  padding-left: 4px;
}
.footer-contact li {
  font-size: 0.88rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 10px;
  line-height: 1.6;
}
.footer-contact li i {
  color: var(--accent2);
  width: 18px;
  text-align: center;
  font-size: 0.85rem;
}
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 20px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .nav-tabs {
    display: none;
  }
  .hamburger {
    display: flex;
  }
  .header-cta {
    display: none;
  }
  .hero-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
  .steps-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .cards-bento {
    grid-template-columns: 1fr 1fr;
  }
  .feature-card.card-main {
    grid-row: span 1;
  }
}
@media (max-width: 768px) {
  .site-header {
    height: 64px;
  }
  .site-header.scrolled {
    height: 56px;
  }
  .hero-grid {
    grid-template-columns: 1fr;
  }
  .hero-image {
    order: 2;
  }
  .feature-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .feature-image {
    order: 1;
  }
  .feature-content {
    order: 2;
  }
  .cards-bento {
    grid-template-columns: 1fr;
  }
  .support-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .support-inner {
    padding: 24px 20px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}
@media (max-width: 520px) {
  .hero {
    padding: 2.5rem 0 3.5rem;
  }
  .hero h1 {
    font-size: 1.9rem;
  }
  .hero-sub {
    font-size: 0.95rem;
  }
  .hero-buttons {
    flex-direction: column;
    align-items: stretch;
  }
  .hero-buttons .btn {
    width: 100%;
  }
  .hero-meta {
    gap: 10px;
  }
  .steps-grid {
    grid-template-columns: 1fr;
  }
  .step-card {
    padding: 24px 18px;
  }
  .faq-question {
    padding: 16px 18px;
    font-size: 0.92rem;
  }
  .faq-answer-inner {
    padding: 0 18px 16px;
    font-size: 0.88rem;
  }
  .modal-box {
    padding: 28px 20px 20px;
  }
  .btn-lg {
    width: 100%;
  }
  .footer-bottom {
    flex-direction: column;
  }
}

/* roulang page: category2 */
:root {
            --primary: #0B1B2B;
            --primary-light: #0E2233;
            --accent: #1B6DE0;
            --accent-hover: #2480F2;
            --teal: #19C8B4;
            --text-main: #E6F0FA;
            --text-secondary: #93A9C2;
            --text-muted: #6B7F99;
            --border-glass: rgba(255, 255, 255, 0.08);
            --border-hover: rgba(25, 200, 180, 0.4);
            --card-bg: rgba(255, 255, 255, 0.04);
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --shadow-card: 0 8px 30px rgba(0, 0, 0, 0.25);
            --shadow-hover: 0 14px 40px rgba(0, 0, 0, 0.4);
            --space-section: clamp(4rem, 8vw, 7rem);
            --font-main: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
        }
        *,
        *::before,
        *::after {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--font-main);
            background: linear-gradient(180deg, var(--primary) 0%, var(--primary-light) 100%);
            color: var(--text-main);
            line-height: 1.75;
            min-height: 100vh;
            overflow-x: hidden;
        }
        img {
            max-width: 100%;
            display: block;
        }
        a {
            color: var(--teal);
            text-decoration: none;
            transition: color .3s ease;
        }
        a:hover {
            color: var(--accent-hover);
        }
        ul,
        ol {
            list-style: none;
        }
        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            background: none;
            color: inherit;
        }
        a:focus-visible,
        button:focus-visible,
        input:focus-visible,
        select:focus-visible {
            outline: 2px solid var(--teal);
            outline-offset: 2px;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding-left: clamp(1rem, 4vw, 2rem);
            padding-right: clamp(1rem, 4vw, 2rem);
        }
        .container-narrow {
            max-width: 860px;
        }

        /* Button */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: .5rem;
            padding: .85rem 1.8rem;
            border-radius: var(--radius-sm);
            font-weight: 500;
            font-size: .95rem;
            line-height: 1.4;
            border: 1px solid transparent;
            cursor: pointer;
            transition: all .3s ease;
            text-align: center;
            white-space: nowrap;
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--accent) 0%, var(--teal) 100%);
            color: #fff;
            box-shadow: 0 4px 18px rgba(27, 109, 224, .35);
        }
        .btn-primary:hover {
            box-shadow: 0 0 20px rgba(25, 200, 180, .45);
            filter: brightness(1.05);
            color: #fff;
            transform: translateY(-2px);
        }
        .btn-primary:active {
            transform: translateY(1px);
            box-shadow: 0 2px 10px rgba(25, 200, 180, .3);
        }
        .btn-secondary {
            background: rgba(255, 255, 255, .06);
            border-color: var(--border-glass);
            color: var(--text-main);
            backdrop-filter: blur(8px);
        }
        .btn-secondary:hover {
            border-color: rgba(25, 200, 180, .5);
            background: rgba(255, 255, 255, .1);
            color: var(--teal);
            transform: translateY(-2px);
        }
        .btn-secondary:active {
            transform: translateY(1px);
        }
        .btn-sm {
            padding: .55rem 1.1rem;
            font-size: .875rem;
        }
        .btn-full {
            width: 100%;
        }

        /* Header */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 100;
            height: 72px;
            background: rgba(11, 27, 43, .55);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-glass);
            transition: height .3s ease, background .3s ease, box-shadow .3s ease;
        }
        .site-header.scrolled {
            height: 60px;
            background: rgba(8, 21, 36, .82);
            box-shadow: 0 8px 30px rgba(0, 0, 0, .3);
        }
        .header-inner {
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 1.25rem;
        }
        .brand {
            display: flex;
            align-items: center;
            gap: .6rem;
            flex-shrink: 0;
        }
        .logo-mark {
            width: 38px;
            height: 38px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, var(--accent), var(--teal));
            border-radius: 10px;
            font-weight: 700;
            color: #fff;
            font-size: 1rem;
            letter-spacing: -.02em;
        }
        .logo-text {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--text-main);
            letter-spacing: -.01em;
        }
        .nav-tabs {
            display: flex;
            align-items: center;
            gap: .5rem;
            padding: .3rem;
            background: rgba(255, 255, 255, .04);
            border: 1px solid var(--border-glass);
            border-radius: 50px;
            overflow-x: auto;
            scrollbar-width: none;
        }
        .nav-tabs::-webkit-scrollbar {
            display: none;
        }
        .nav-tabs .tab {
            flex-shrink: 0;
            padding: .5rem 1.1rem;
            border-radius: 50px;
            font-size: .875rem;
            font-weight: 500;
            color: var(--text-secondary);
            border: 1px solid transparent;
            transition: all .3s ease;
            white-space: nowrap;
        }
        .nav-tabs .tab:hover {
            color: var(--text-main);
            background: rgba(255, 255, 255, .06);
            border-color: var(--border-glass);
        }
        .nav-tabs .tab.active {
            color: #fff;
            background: linear-gradient(135deg, var(--accent), var(--teal));
            border-color: transparent;
            box-shadow: 0 0 14px rgba(25, 200, 180, .35);
        }
        .header-actions {
            display: flex;
            align-items: center;
            gap: .75rem;
            flex-shrink: 0;
        }
        .nav-toggle {
            display: none;
            width: 44px;
            height: 44px;
            border-radius: 10px;
            border: 1px solid var(--border-glass);
            background: rgba(255, 255, 255, .06);
            color: var(--text-main);
            font-size: 1.1rem;
            cursor: pointer;
            align-items: center;
            justify-content: center;
        }
        .nav-toggle:hover {
            color: var(--teal);
            border-color: var(--border-hover);
        }

        /* Hero */
        .hero {
            position: relative;
            padding: clamp(6rem, 12vh, 8rem) 0 clamp(3rem, 6vw, 5rem);
            overflow: hidden;
            background: linear-gradient(135deg, #0B1B2B 0%, #0E2233 55%, #0F2C3A 100%);
        }
        .hero-bg-img {
            position: absolute;
            inset: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            opacity: .18;
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background:
                radial-gradient(640px 340px at 20% 20%, rgba(27, 109, 224, .35), transparent 70%),
                radial-gradient(520px 320px at 80% 80%, rgba(25, 200, 180, .22), transparent 70%),
                linear-gradient(180deg, rgba(11, 27, 43, .4) 0%, rgba(11, 27, 43, .85) 100%);
        }
        .hero-inner {
            position: relative;
            z-index: 2;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: clamp(1.5rem, 4vw, 3rem);
            align-items: center;
        }
        .hero-tag {
            display: inline-flex;
            align-items: center;
            gap: .4rem;
            padding: .35rem 1rem;
            border-radius: 50px;
            font-size: .8rem;
            color: var(--teal);
            background: rgba(25, 200, 180, .12);
            border: 1px solid rgba(25, 200, 180, .25);
            margin-bottom: 1.1rem;
        }
        .hero h1 {
            font-size: clamp(2.2rem, 4vw, 3.2rem);
            font-weight: 700;
            letter-spacing: -.02em;
            line-height: 1.2;
            margin-bottom: 1rem;
        }
        .hero-sub {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 36rem;
            margin-bottom: 1.8rem;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: .75rem;
        }
        .hero-visual {
            position: relative;
        }
        .hero-img {
            border-radius: var(--radius-lg);
            box-shadow: 0 20px 50px rgba(0, 0, 0, .45);
            border: 1px solid var(--border-glass);
            aspect-ratio: 4/3;
            object-fit: cover;
            width: 100%;
        }

        /* Section */
        .section {
            padding: var(--space-section) 0;
            position: relative;
        }
        .section-alt {
            background: rgba(255, 255, 255, .02);
            border-top: 1px solid var(--border-glass);
            border-bottom: 1px solid var(--border-glass);
        }
        .section-head {
            max-width: 42rem;
            margin: 0 auto clamp(2rem, 4vw, 3rem);
            text-align: center;
        }
        .section-kicker {
            display: inline-flex;
            align-items: center;
            gap: .4rem;
            font-size: .85rem;
            color: var(--teal);
            font-weight: 500;
            letter-spacing: .06em;
            margin-bottom: .6rem;
            position: relative;
            padding-left: 1.6rem;
        }
        .section-kicker::before {
            content: "";
            position: absolute;
            left: 0;
            top: 50%;
            width: 1.1rem;
            height: 2px;
            background: var(--teal);
            border-radius: 2px;
            transform: translateY(-50%);
        }
        .section-head h2 {
            font-size: clamp(1.6rem, 2.4vw, 2.2rem);
            font-weight: 600;
            letter-spacing: -.01em;
            margin-bottom: .75rem;
            color: var(--text-main);
        }
        .section-head p {
            color: var(--text-secondary);
            font-size: .95rem;
        }

        /* Benefits */
        .benefit-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            grid-auto-rows: auto;
            gap: 1.5rem;
        }
        .benefit-card {
            background: var(--card-bg);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-lg);
            padding: clamp(1.2rem, 2vw, 1.8rem);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            box-shadow: var(--shadow-card);
            transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease;
            position: relative;
            overflow: hidden;
        }
        .benefit-card::after {
            content: "";
            position: absolute;
            top: -40px;
            right: -40px;
            width: 100px;
            height: 100px;
            background: radial-gradient(circle, rgba(27, 109, 224, .18), transparent 70%);
            border-radius: 50%;
            transition: opacity .3s ease;
            opacity: 0;
        }
        .benefit-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--shadow-hover);
            border-color: var(--border-hover);
        }
        .benefit-card:hover::after {
            opacity: 1;
        }
        .benefit-card-lg {
            grid-column: 1;
            grid-row: span 2;
            display: flex;
            flex-direction: column;
            justify-content: center;
            background: linear-gradient(145deg, rgba(27, 109, 224, .16), rgba(25, 200, 180, .08));
        }
        .benefit-icon {
            width: 52px;
            height: 52px;
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            color: var(--teal);
            background: rgba(25, 200, 180, .14);
            border: 1px solid rgba(25, 200, 180, .2);
            margin-bottom: 1.2rem;
        }
        .benefit-card h3 {
            font-size: 1.15rem;
            font-weight: 600;
            margin-bottom: .6rem;
        }
        .benefit-card p {
            color: var(--text-secondary);
            font-size: .9rem;
            line-height: 1.7;
        }
        .benefit-card-lg .benefit-icon {
            width: 60px;
            height: 60px;
            font-size: 1.5rem;
        }
        .benefit-card-lg h3 {
            font-size: 1.5rem;
            margin-bottom: .8rem;
        }
        .benefit-card-lg p {
            font-size: 1rem;
            max-width: 30rem;
        }
        .benefit-card:nth-child(2) {
            grid-column: 2;
            grid-row: 1;
        }
        .benefit-card:nth-child(3) {
            grid-column: 3;
            grid-row: 1;
        }
        .benefit-card:nth-child(4) {
            grid-column: 2;
            grid-row: 2;
        }
        .benefit-card:nth-child(5) {
            grid-column: 3;
            grid-row: 2;
        }

        /* Scenarios */
        .scenario-inner {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: clamp(2rem, 5vw, 4rem);
            align-items: center;
        }
        .scenario-visual img {
            width: 100%;
            aspect-ratio: 4/3;
            object-fit: cover;
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-glass);
            box-shadow: var(--shadow-card);
        }
        .scenario-content .section-kicker {
            padding-left: 0;
        }
        .scenario-content .section-kicker::before {
            display: none;
        }
        .scenario-content h2 {
            font-size: clamp(1.6rem, 2.4vw, 2.2rem);
            font-weight: 600;
            letter-spacing: -.01em;
            margin-bottom: 1.2rem;
        }
        .scenario-list {
            display: flex;
            flex-direction: column;
            gap: 1.2rem;
            margin-top: .5rem;
        }
        .scenario-list li {
            display: flex;
            gap: 1rem;
            padding: 1rem 1.2rem;
            background: var(--card-bg);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md);
            transition: border-color .3s ease, transform .3s ease, background .3s ease;
        }
        .scenario-list li:hover {
            border-color: var(--border-hover);
            transform: translateX(6px);
            background: rgba(255, 255, 255, .06);
        }
        .scenario-list .sc-icon {
            flex-shrink: 0;
            width: 42px;
            height: 42px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1rem;
            color: var(--teal);
            background: rgba(25, 200, 180, .12);
            border: 1px solid rgba(25, 200, 180, .2);
        }
        .scenario-list h3 {
            font-size: 1.05rem;
            font-weight: 600;
            margin-bottom: .3rem;
        }
        .scenario-list p {
            font-size: .875rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* Process */
        .process-steps {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1.5rem;
        }
        .process-step {
            position: relative;
            text-align: center;
            padding: 2rem 1.2rem;
            background: var(--card-bg);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-lg);
            backdrop-filter: blur(12px);
            transition: transform .3s ease, border-color .3s ease, box-shadow .3s ease;
        }
        .process-step:hover {
            transform: translateY(-6px);
            border-color: var(--border-hover);
            box-shadow: var(--shadow-hover);
        }
        .process-step .step-num {
            width: 44px;
            height: 44px;
            margin: 0 auto 1rem;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, var(--accent), var(--teal));
            color: #fff;
            font-weight: 700;
            font-size: 1rem;
            box-shadow: 0 0 16px rgba(25, 200, 180, .3);
        }
        .process-step h3 {
            font-size: 1.1rem;
            font-weight: 600;
            margin-bottom: .5rem;
        }
        .process-step p {
            font-size: .875rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }
        .process-step:not(:last-child)::after {
            content: "";
            position: absolute;
            top: 50%;
            right: -0.9rem;
            width: 1.2rem;
            height: 2px;
            background: linear-gradient(90deg, var(--teal), transparent);
        }

        /* FAQ */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: .75rem;
        }
        .faq-item {
            background: var(--card-bg);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: border-color .3s ease, box-shadow .3s ease;
        }
        .faq-item.open {
            border-color: var(--border-hover);
            box-shadow: 0 0 20px rgba(25, 200, 180, .12);
        }
        .faq-q {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 1rem;
            padding: 1.1rem 1.4rem;
            background: transparent;
            border: none;
            color: var(--text-main);
            font-size: 1rem;
            font-weight: 500;
            text-align: left;
            cursor: pointer;
            transition: background .3s ease;
        }
        .faq-q:hover {
            background: rgba(255, 255, 255, .04);
        }
        .faq-q .faq-icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            background: rgba(25, 200, 180, .12);
            color: var(--teal);
            font-size: .8rem;
            transition: transform .3s ease, background .3s ease;
        }
        .faq-item.open .faq-icon {
            transform: rotate(45deg);
            background: rgba(25, 200, 180, .25);
        }
        .faq-a {
            max-height: 0;
            overflow: hidden;
            transition: max-height .35s ease, padding .35s ease;
            padding: 0 1.4rem;
            color: var(--text-secondary);
            font-size: .9rem;
            line-height: 1.75;
        }
        .faq-item.open .faq-a {
            max-height: 260px;
            padding: 0 1.4rem 1.2rem;
        }

        /* CTA */
        .cta-box {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 2rem;
            padding: clamp(2rem, 4vw, 3rem);
            background: linear-gradient(135deg, rgba(27, 109, 224, .2), rgba(25, 200, 180, .12));
            border: 1px solid var(--border-hover);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-card);
            position: relative;
            overflow: hidden;
        }
        .cta-box::before {
            content: "";
            position: absolute;
            top: -60px;
            right: -60px;
            width: 160px;
            height: 160px;
            background: radial-gradient(circle, rgba(25, 200, 180, .25), transparent 70%);
        }
        .cta-copy h2 {
            font-size: clamp(1.4rem, 2.4vw, 1.9rem);
            font-weight: 600;
            margin-bottom: .5rem;
        }
        .cta-copy p {
            color: var(--text-secondary);
            font-size: .95rem;
        }
        .cta-box .btn {
            position: relative;
            z-index: 2;
            flex-shrink: 0;
        }

        /* Footer */
        .site-footer {
            background: #081524;
            border-top: 1px solid var(--border-glass);
            padding: clamp(3rem, 6vw, 4.5rem) 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1.4fr;
            gap: 2.5rem;
            padding-bottom: 2.5rem;
        }
        .footer-logo {
            display: flex;
            align-items: center;
            gap: .6rem;
            margin-bottom: 1rem;
        }
        .footer-desc {
            color: var(--text-secondary);
            font-size: .9rem;
            max-width: 22rem;
            line-height: 1.7;
        }
        .footer-col h4 {
            font-size: .95rem;
            font-weight: 600;
            color: var(--text-main);
            margin-bottom: 1rem;
        }
        .footer-col ul {
            display: flex;
            flex-direction: column;
            gap: .55rem;
        }
        .footer-col ul a {
            color: var(--text-secondary);
            font-size: .875rem;
            transition: color .3s ease, padding-left .3s ease;
        }
        .footer-col ul a:hover {
            color: var(--teal);
            padding-left: 4px;
        }
        .footer-contact li {
            color: var(--text-secondary);
            font-size: .875rem;
            display: flex;
            align-items: center;
            gap: .6rem;
        }
        .footer-contact i {
            color: var(--teal);
            width: 1rem;
            flex-shrink: 0;
        }
        .footer-bottom {
            border-top: 1px solid var(--border-glass);
            padding: 1.5rem 0;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 1rem;
            font-size: .8rem;
            color: var(--text-muted);
            flex-wrap: wrap;
        }

        /* Modal */
        .modal-overlay {
            display: none;
            position: fixed;
            inset: 0;
            z-index: 200;
            background: rgba(0, 0, 0, .6);
            backdrop-filter: blur(4px);
            -webkit-backdrop-filter: blur(4px);
            align-items: center;
            justify-content: center;
            padding: 1rem;
        }
        .modal-overlay.show {
            display: flex;
        }
        .modal-box {
            position: relative;
            width: 100%;
            max-width: 480px;
            background: #0E2233;
            border: 1px solid var(--border-hover);
            border-radius: var(--radius-lg);
            padding: clamp(1.5rem, 3vw, 2rem);
            box-shadow: var(--shadow-hover);
            animation: modalIn .3s ease;
        }
        @keyframes modalIn {
            from {
                opacity: 0;
                transform: translateY(-20px) scale(.98);
            }
            to {
                opacity: 1;
                transform: translateY(0) scale(1);
            }
        }
        .modal-close {
            position: absolute;
            top: 1rem;
            right: 1rem;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            border: 1px solid var(--border-glass);
            background: rgba(255, 255, 255, .06);
            color: var(--text-secondary);
            cursor: pointer;
            transition: all .3s ease;
            font-size: .9rem;
        }
        .modal-close:hover {
            color: var(--teal);
            border-color: var(--border-hover);
            background: rgba(25, 200, 180, .1);
        }
        .modal-box h3 {
            font-size: 1.2rem;
            font-weight: 600;
            margin-bottom: .4rem;
        }
        .modal-sub {
            font-size: .875rem;
            color: var(--text-secondary);
            margin-bottom: 1.4rem;
        }
        .modal-box form {
            display: flex;
            flex-direction: column;
            gap: .9rem;
        }
        .modal-box input,
        .modal-box select {
            width: 100%;
            padding: .75rem 1rem;
            border-radius: var(--radius-sm);
            border: 1px solid #3B5A77;
            background: rgba(255, 255, 255, .06);
            color: var(--text-main);
            transition: border-color .3s ease, box-shadow .3s ease;
        }
        .modal-box input::placeholder {
            color: var(--text-muted);
        }
        .modal-box input:focus,
        .modal-box select:focus {
            outline: none;
            border-color: var(--teal);
            box-shadow: 0 0 0 3px rgba(25, 200, 180, .15);
        }
        .modal-box select option {
            background: #0E2233;
            color: var(--text-main);
        }
        .modal-privacy {
            margin-top: 1rem;
            font-size: .75rem;
            color: var(--text-muted);
            text-align: center;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .nav-tabs .tab {
                padding: .45rem .9rem;
                font-size: .8rem;
            }
            .benefit-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .benefit-card-lg {
                grid-column: span 2;
                grid-row: span 1;
            }
            .benefit-card:nth-child(2) {
                grid-column: auto;
                grid-row: auto;
            }
            .benefit-card:nth-child(3) {
                grid-column: auto;
                grid-row: auto;
            }
            .benefit-card:nth-child(4) {
                grid-column: auto;
                grid-row: auto;
            }
            .benefit-card:nth-child(5) {
                grid-column: auto;
                grid-row: auto;
            }
            .process-steps {
                grid-template-columns: repeat(2, 1fr);
            }
            .process-step::after {
                display: none !important;
            }
            .hero-inner {
                grid-template-columns: 1fr;
            }
            .hero-visual {
                order: 2;
            }
            .scenario-inner {
                grid-template-columns: 1fr;
            }
            .scenario-visual {
                order: -1;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 768px) {
            .nav-tabs {
                position: fixed;
                top: 0;
                right: 0;
                height: 100vh;
                width: min(320px, 78vw);
                flex-direction: column;
                align-items: stretch;
                justify-content: flex-start;
                background: rgba(8, 21, 36, .98);
                padding: 4.5rem 1.25rem 2rem;
                border-radius: 0;
                border-left: 1px solid var(--border-glass);
                transform: translateX(100%);
                transition: transform .35s ease;
                z-index: 99;
                overflow-y: auto;
            }
            .nav-tabs.open {
                transform: translateX(0);
            }
            .nav-tabs .tab {
                width: 100%;
                text-align: center;
                border-radius: 12px;
                padding: .8rem 1rem;
                font-size: .95rem;
            }
            .nav-toggle {
                display: inline-flex;
            }
            .cta-box {
                flex-direction: column;
                text-align: center;
            }
        }
        @media (max-width: 640px) {
            .site-header {
                height: 62px;
            }
            .site-header.scrolled {
                height: 54px;
            }
            .logo-text {
                font-size: .95rem;
            }
            .logo-mark {
                width: 34px;
                height: 34px;
                font-size: .85rem;
            }
            .header-actions .btn {
                padding: .4rem .8rem;
                font-size: .75rem;
            }
            .hero {
                padding-top: 5.5rem;
            }
            .hero h1 {
                font-size: 2rem;
            }
            .hero-sub {
                font-size: .95rem;
            }
            .hero-actions .btn {
                width: 100%;
            }
            .benefit-grid {
                grid-template-columns: 1fr;
            }
            .benefit-card-lg {
                grid-column: auto;
                grid-row: auto;
            }
            .process-steps {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .scenario-list li {
                padding: .9rem 1rem;
            }
        }