/* roulang page: index */
:root {
  --bg-0: #04060D;
  --bg-1: #0A0F1E;
  --bg-card: rgba(16, 23, 43, 0.66);
  --e-cyan: #00E0C6;
  --e-cyan-dim: rgba(0, 224, 198, 0.12);
  --e-violet: #7C6CFF;
  --e-amber: #FFC164;
  --success: #34E0A1;
  --error: #FF6B6B;
  --text-1: #EAF0FA;
  --text-2: #A3B0C8;
  --text-3: #5D6C88;
  --line: rgba(255,255,255,0.08);
  --line-strong: rgba(0,224,198,0.35);
  --grad-main: linear-gradient(135deg, #00E0C6 0%, #00B4FF 100%);
  --grad-glow: 0 0 24px rgba(0,224,198,0.35);
  --radius-card: 16px;
  --radius-btn: 10px;
  --radius-tag: 20px;
  --shadow-card: 0 8px 32px rgba(0,0,0,0.28);
  --shadow-hover: 0 14px 44px rgba(0,0,0,0.44);
  --font-stack: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-stack);
  background: var(--bg-0);
  color: var(--text-1);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; transition: color 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
input, textarea { font-family: inherit; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section { padding: 96px 0; }
.section-alt { background: var(--bg-1); }
.section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 48px;
  gap: 24px;
  flex-wrap: wrap;
}
.section-title-wrap { display: flex; align-items: center; gap: 14px; }
.section-line {
  width: 40px;
  height: 2px;
  background: var(--grad-main);
  border-radius: 2px;
  box-shadow: 0 0 12px rgba(0,224,198,0.6);
  flex-shrink: 0;
}
.section-title {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: var(--text-1);
  line-height: 1.4;
}
.section-subtitle {
  margin-top: 8px;
  color: var(--text-2);
  font-size: 15px;
  max-width: 560px;
}
.more-link {
  color: var(--text-2);
  font-size: 14px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: color 0.25s ease, transform 0.25s ease;
  white-space: nowrap;
}
.more-link:hover { color: var(--e-cyan); transform: translateX(4px); }
.badge {
  display: inline-block;
  background: var(--e-cyan-dim);
  color: var(--e-cyan);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.5px;
  padding: 3px 14px;
  border-radius: 20px;
  border: 1px solid rgba(0,224,198,0.15);
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}
.badge:hover { border-color: var(--line-strong); box-shadow: 0 0 12px rgba(0,224,198,0.2); }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 700;
  padding: 12px 28px;
  border-radius: var(--radius-btn);
  transition: all 0.3s ease;
  line-height: 1.4;
  border: 1px solid transparent;
  white-space: nowrap;
}
.btn-primary {
  background: var(--grad-main);
  color: #04101C;
  box-shadow: var(--grad-glow);
}
.btn-primary:hover {
  filter: brightness(1.12);
  transform: translateY(-2px);
  box-shadow: 0 0 36px rgba(0,224,198,0.5);
}
.btn-primary:active { transform: scale(0.97); }
.btn-primary:focus-visible {
  outline: 2px solid var(--e-cyan);
  outline-offset: 3px;
}
.btn-secondary {
  background: transparent;
  border-color: var(--line-strong);
  color: var(--e-cyan);
}
.btn-secondary:hover {
  background: var(--e-cyan-dim);
  border-color: var(--e-cyan);
  box-shadow: 0 0 20px rgba(0,224,198,0.2);
}
.btn-secondary:active { transform: scale(0.97); }
.btn-secondary:focus-visible {
  outline: 2px solid var(--e-cyan);
  outline-offset: 3px;
}
.btn-sm { padding: 8px 20px; font-size: 14px; }
.btn-lg { padding: 14px 36px; font-size: 16px; }
.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  transition: box-shadow 0.3s ease, border-color 0.3s ease, transform 0.3s ease;
}
.glass-card:hover {
  box-shadow: var(--shadow-hover);
  border-color: var(--line-strong);
}

/* ===== Header & Nav ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: rgba(4,6,13,0.86);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
  z-index: 1000;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 24px;
}
.logo {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 0.5px;
  color: var(--text-1);
  display: flex;
  align-items: center;
  gap: 10px;
  transition: text-shadow 0.25s ease;
  flex-shrink: 0;
}
.logo:hover { text-shadow: 0 0 18px rgba(0,224,198,0.5); }
.logo-word { font-weight: 800; color: #fff; }
.logo-suffix {
  background: var(--grad-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 800;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}
.main-nav a {
  color: var(--text-2);
  font-size: 15px;
  padding: 10px 16px;
  border-radius: 8px;
  transition: color 0.25s ease, box-shadow 0.25s ease, background 0.25s ease;
  position: relative;
}
.main-nav a:hover {
  color: var(--text-1);
  box-shadow: 0 2px 12px rgba(0,224,198,0.6);
}
.main-nav a.active {
  color: var(--e-cyan);
  box-shadow: 0 2px 12px rgba(0,224,198,0.6);
}
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}
.nav-glow-line {
  height: 1px;
  background: linear-gradient(90deg, var(--e-cyan) 0%, transparent 50%, var(--e-violet) 100%);
}
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 8px;
  border-radius: 8px;
  border: 1px solid var(--line);
}
.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text-1);
  border-radius: 2px;
  transition: all 0.3s ease;
}
.hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
.mobile-menu {
  display: none;
  position: fixed;
  top: 68px;
  left: 0;
  width: 100%;
  background: rgba(4,6,13,0.96);
  backdrop-filter: blur(16px);
  padding: 24px;
  flex-direction: column;
  gap: 4px;
  border-bottom: 1px solid var(--line);
  z-index: 999;
  box-shadow: 0 20px 40px rgba(0,0,0,0.4);
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
  font-size: 20px;
  padding: 16px 8px;
  color: var(--text-2);
  border-bottom: 1px solid rgba(255,255,255,0.04);
}
.mobile-menu a.active { color: var(--e-cyan); }
.mobile-menu a:last-child {
  margin-top: 16px;
  border-bottom: none;
  text-align: center;
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 720px;
  padding: 168px 0 80px;
  background:
    linear-gradient(90deg, rgba(4,6,13,0.88) 0%, rgba(4,6,13,0.6) 55%, rgba(4,6,13,0.35) 100%),
    url('/assets/images/backpic/back-1.png') center/cover no-repeat;
  border-bottom: 1px solid var(--line);
}
.hero-inner {
  display: grid;
  grid-template-columns: 7fr 5fr;
  gap: 48px;
  align-items: center;
}
.hero-content { max-width: 640px; }
.hero-tagline {
  display: inline-block;
  font-size: 13px;
  letter-spacing: 2px;
  color: var(--e-cyan);
  background: var(--e-cyan-dim);
  border: 1px solid rgba(0,224,198,0.2);
  padding: 4px 16px;
  border-radius: 20px;
  margin-bottom: 24px;
}
.hero h1 {
  font-size: 42px;
  font-weight: 800;
  line-height: 1.3;
  color: var(--text-1);
  margin-bottom: 20px;
  letter-spacing: 0.5px;
}
.hero h1 .grad {
  background: var(--grad-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-sub {
  font-size: 17px;
  color: var(--text-2);
  margin-bottom: 36px;
  max-width: 480px;
  line-height: 1.7;
}
.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}
.hero-trust {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
}
.trust-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-3);
}
.trust-item .icon {
  width: 18px;
  height: 18px;
  color: var(--e-cyan);
  flex-shrink: 0;
}
.hero-panel {
  width: 100%;
  max-width: 400px;
  margin-left: auto;
  padding: 32px;
  border-radius: 20px;
}
.panel-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-1);
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.panel-title::before {
  content: '';
  width: 4px;
  height: 18px;
  background: var(--grad-main);
  border-radius: 4px;
}
.panel-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.panel-item {
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px 16px;
  text-align: center;
  transition: border-color 0.3s ease, background 0.3s ease, transform 0.3s ease;
}
.panel-item:hover {
  border-color: var(--line-strong);
  background: var(--e-cyan-dim);
  transform: translateY(-2px);
}
.panel-item .icon {
  font-size: 24px;
  color: var(--e-cyan);
  margin-bottom: 10px;
}
.panel-item .label {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-1);
}
.panel-divider {
  height: 1px;
  background: var(--line);
  margin: 24px 0;
}
.panel-note {
  font-size: 13px;
  color: var(--text-3);
  display: flex;
  align-items: center;
  gap: 8px;
}
.panel-note .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 8px rgba(52,224,161,0.6);
  flex-shrink: 0;
}

/* ===== Pain Points ===== */
.pain-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.pain-card {
  padding: 28px;
  position: relative;
  overflow: hidden;
}
.pain-card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 100%;
  background: transparent;
  transition: background 0.3s ease, box-shadow 0.3s ease;
  border-radius: 3px;
}
.pain-card:hover::before {
  background: var(--e-cyan);
  box-shadow: 0 0 12px rgba(0,224,198,0.5);
}
.pain-icon {
  font-size: 28px;
  color: var(--e-violet);
  margin-bottom: 16px;
}
.pain-card h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-1);
  margin-bottom: 10px;
}
.pain-card p {
  font-size: 14px;
  color: var(--text-2);
  line-height: 1.7;
}

/* ===== Solution ===== */
.solution-grid-2plus1 {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 24px;
  margin-bottom: 24px;
}
.solution-main-card {
  padding: 36px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.solution-main-card .step-num {
  font-size: 48px;
  font-weight: 800;
  color: var(--e-cyan);
  line-height: 1;
  margin-bottom: 16px;
  opacity: 0.25;
}
.solution-main-card h3 {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-1);
  margin-bottom: 16px;
}
.solution-main-card ul {
  display: grid;
  gap: 14px;
  margin-top: 12px;
}
.solution-main-card ul li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 15px;
  color: var(--text-2);
  line-height: 1.6;
}
.solution-main-card ul li::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--grad-main);
  box-shadow: 0 0 8px rgba(0,224,198,0.5);
  flex-shrink: 0;
}
.solution-side-cards {
  display: grid;
  gap: 24px;
}
.solution-mini-card {
  padding: 28px;
}
.solution-mini-card .mini-icon {
  font-size: 26px;
  color: var(--e-cyan);
  margin-bottom: 12px;
}
.solution-mini-card h4 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-1);
  margin-bottom: 8px;
}
.solution-mini-card p {
  font-size: 14px;
  color: var(--text-2);
  line-height: 1.6;
}
.solution-timeline-card {
  padding: 36px;
  margin-bottom: 24px;
}
.solution-timeline-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-1);
  margin-bottom: 28px;
}
.timeline-steps {
  display: flex;
  align-items: center;
  gap: 0;
}
.timeline-step {
  flex: 1;
  text-align: center;
  position: relative;
}
.timeline-dot {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--grad-main);
  box-shadow: 0 0 14px rgba(0,224,198,0.5);
  margin: 0 auto 12px;
  position: relative;
  z-index: 2;
}
.timeline-step::after {
  content: '';
  position: absolute;
  top: 8px;
  left: calc(50% + 8px);
  width: calc(100% - 16px);
  height: 1px;
  background: linear-gradient(90deg, rgba(0,224,198,0.5), rgba(0,180,255,0.2));
}
.timeline-step:last-child::after { display: none; }
.timeline-step .step-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-1);
  margin-bottom: 4px;
}
.timeline-step .step-desc {
  font-size: 12px;
  color: var(--text-3);
}
.solution-2col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: stretch;
}
.solution-img-card {
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--line);
  position: relative;
  min-height: 320px;
}
.solution-img-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  position: absolute;
  inset: 0;
}
.solution-img-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 40%, rgba(4,6,13,0.6));
}
.solution-text-card {
  padding: 36px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.solution-text-card h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-1);
  margin-bottom: 20px;
}
.solution-text-card ul {
  display: grid;
  gap: 14px;
  margin-bottom: 28px;
}
.solution-text-card ul li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
  color: var(--text-2);
  line-height: 1.6;
}
.solution-text-card ul li::before {
  content: '✓';
  color: var(--e-cyan);
  font-weight: 700;
  flex-shrink: 0;
  font-size: 15px;
}

/* ===== Stats ===== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 32px;
}
.stat-card {
  padding: 36px 28px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 2px;
  background: var(--grad-main);
  border-radius: 2px;
}
.stat-number {
  font-size: 46px;
  font-weight: 800;
  color: var(--e-cyan);
  line-height: 1.1;
  margin-bottom: 12px;
  font-feature-settings: "tnum";
}
.stat-label {
  font-size: 14px;
  color: var(--text-2);
}
.stat-trend {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  color: var(--success);
  margin-top: 12px;
  background: rgba(52,224,161,0.1);
  padding: 2px 10px;
  border-radius: 12px;
}
.milestone-card {
  padding: 28px 32px;
}
.milestone-card h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-1);
  margin-bottom: 8px;
}
.milestone-list {
  margin-top: 20px;
}
.milestone-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  gap: 16px;
  flex-wrap: wrap;
}
.milestone-item:last-child { border-bottom: none; }
.milestone-time {
  font-size: 14px;
  color: var(--text-3);
  min-width: 100px;
}
.milestone-desc {
  font-size: 15px;
  color: var(--text-1);
  font-weight: 600;
  flex: 1;
}
.milestone-status {
  font-size: 12px;
  padding: 3px 14px;
  border-radius: 20px;
  font-weight: 500;
}
.status-done {
  background: rgba(52,224,161,0.12);
  color: var(--success);
  border: 1px solid rgba(52,224,161,0.25);
}
.status-active {
  background: var(--e-cyan-dim);
  color: var(--e-cyan);
  border: 1px solid rgba(0,224,198,0.25);
}

/* ===== Testimonials ===== */
.testi-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.testi-card {
  padding: 32px;
  position: relative;
}
.testi-card .quote-icon {
  font-size: 48px;
  color: var(--e-cyan);
  line-height: 1;
  margin-bottom: 16px;
  font-family: Georgia, serif;
  opacity: 0.6;
}
.testi-card .testi-text {
  font-size: 14px;
  color: var(--text-2);
  line-height: 1.7;
  margin-bottom: 24px;
}
.testi-card .testi-author {
  font-size: 12px;
  color: var(--text-3);
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.testi-stars {
  color: var(--e-amber);
  font-size: 15px;
  letter-spacing: 2px;
  margin-top: 10px;
}

/* ===== News ===== */
.news-layout {
  display: grid;
  grid-template-columns: 7fr 5fr;
  gap: 24px;
}
.news-featured-card {
  display: block;
  overflow: hidden;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: var(--bg-card);
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
  height: 100%;
}
.news-featured-card:hover {
  border-color: var(--line-strong);
  box-shadow: var(--shadow-hover);
}
.news-featured-img {
  width: 100%;
  height: 220px;
  overflow: hidden;
}
.news-featured-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.news-featured-card:hover .news-featured-img img { transform: scale(1.03); }
.news-featured-body { padding: 24px; }
.news-featured-body .badge { margin-bottom: 12px; }
.news-featured-body h3 {
  font-size: 19px;
  font-weight: 700;
  color: var(--text-1);
  margin-bottom: 12px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.news-featured-body p {
  font-size: 14px;
  color: var(--text-2);
  line-height: 1.6;
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.news-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.news-time {
  font-size: 13px;
  color: var(--text-3);
}
.read-more {
  font-size: 14px;
  color: var(--e-cyan);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap 0.25s ease;
}
.read-more:hover { gap: 8px; }
.news-side-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.news-list-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 16px;
  border-radius: 14px;
  background: var(--bg-card);
  border: 1px solid var(--line);
  transition: border-color 0.3s ease, box-shadow 0.3s ease, transform 0.3s ease;
  height: calc((100% - 32px) / 3);
}
.news-list-item:hover {
  border-color: var(--line-strong);
  box-shadow: 0 8px 30px rgba(0,0,0,0.3);
  transform: translateY(-2px);
}
.news-list-thumb {
  width: 96px;
  height: 72px;
  flex-shrink: 0;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--line);
}
.news-list-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.news-list-item:hover .news-list-thumb img { transform: scale(1.05); }
.news-list-info { flex: 1; min-width: 0; }
.news-list-info h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-1);
  margin-bottom: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: color 0.25s ease;
}
.news-list-item:hover .news-list-info h4 { color: var(--e-cyan); }
.news-list-info p {
  font-size: 13px;
  color: var(--text-2);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 6px;
}
.news-empty-state {
  grid-column: 1 / -1;
  padding: 60px 24px;
  text-align: center;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 16px;
}
.news-empty-state .empty-icon {
  font-size: 40px;
  color: var(--text-3);
  margin-bottom: 16px;
  display: block;
}
.news-empty-state p {
  color: var(--text-2);
  font-size: 15px;
}

/* ===== FAQ ===== */
.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: grid;
  gap: 16px;
}
.faq-item {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--bg-card);
  overflow: hidden;
  transition: border-color 0.3s ease;
}
.faq-item.active {
  border-color: var(--line-strong);
  box-shadow: 0 8px 28px rgba(0,0,0,0.3);
}
.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 24px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-1);
  cursor: pointer;
  text-align: left;
  transition: color 0.25s ease;
}
.faq-question:hover { color: var(--e-cyan); }
.faq-question .plus {
  font-size: 24px;
  color: var(--e-cyan);
  transition: transform 0.3s ease;
  flex-shrink: 0;
  line-height: 1;
}
.faq-item.active .plus { transform: rotate(45deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, opacity 0.3s ease;
  opacity: 0;
}
.faq-item.active .faq-answer {
  max-height: 300px;
  opacity: 1;
}
.faq-answer-inner {
  padding: 0 24px 20px 24px;
  border-left: 2px solid var(--e-cyan);
  margin: 0 24px 4px 24px;
  padding-left: 20px;
}
.faq-answer-inner p {
  font-size: 14px;
  color: var(--text-2);
  line-height: 1.7;
}

/* ===== CTA ===== */
.cta-section {
  background: var(--bg-1);
  position: relative;
  overflow: hidden;
}
.cta-section::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(0,224,198,0.08) 0%, transparent 70%);
  pointer-events: none;
}
.cta-card {
  position: relative;
  padding: 60px 48px;
  text-align: center;
  overflow: hidden;
}
.cta-card .cta-icon {
  font-size: 52px;
  margin-bottom: 20px;
  display: block;
}
.cta-card h2 {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-1);
  margin-bottom: 16px;
  letter-spacing: 0.5px;
}
.cta-card p {
  color: var(--text-2);
  max-width: 540px;
  margin: 0 auto 36px;
  font-size: 15px;
}
.cta-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ===== Footer ===== */
.site-footer {
  background: var(--bg-0);
  padding: 64px 0 32px;
  border-top: 1px solid rgba(0,224,198,0.2);
  position: relative;
}
.site-footer::before {
  content: '';
  position: absolute;
  top: -1px;
  left: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, var(--e-cyan) 0%, transparent 40%, transparent 60%, var(--e-violet) 100%);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 2fr;
  gap: 48px;
  margin-bottom: 40px;
}
.footer-logo {
  font-size: 20px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 12px;
  display: inline-block;
}
.footer-logo .logo-suffix {
  background: var(--grad-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.footer-desc {
  font-size: 14px;
  color: var(--text-3);
  line-height: 1.7;
  margin-top: 12px;
  max-width: 320px;
}
.footer-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-1);
  margin-bottom: 16px;
}
.footer-links {
  display: grid;
  gap: 10px;
}
.footer-links a {
  font-size: 14px;
  color: var(--text-3);
  transition: color 0.25s ease, padding-left 0.25s ease;
}
.footer-links a:hover {
  color: var(--e-cyan);
  padding-left: 4px;
}
.footer-note {
  font-size: 14px;
  color: var(--text-3);
  line-height: 1.8;
}
.footer-bottom {
  border-top: 1px solid var(--line);
  padding-top: 24px;
  text-align: center;
  font-size: 13px;
  color: var(--text-3);
}
.footer-bottom a { color: var(--text-3); }
.footer-bottom a:hover { color: var(--e-cyan); }

/* ===== Back to top ===== */
.back-top {
  color: var(--e-cyan);
  font-size: 14px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: gap 0.25s ease;
}
.back-top:hover { gap: 10px; }

/* ===== Responsive ===== */
@media (max-width: 1199px) {
  .hero { padding-top: 140px; }
  .hero-inner { gap: 32px; }
  .hero h1 { font-size: 36px; }
  .container { padding: 0 20px; }
}
@media (max-width: 1024px) {
  .section { padding: 64px 0; }
  .hero-inner { grid-template-columns: 1fr; }
  .hero-panel { max-width: none; margin: 0; }
  .solution-grid-2plus1 { grid-template-columns: 1fr; }
  .solution-side-cards { grid-template-columns: 1fr 1fr; }
  .solution-2col { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .stats-grid .stat-card:last-child { grid-column: 1 / -1; }
  .testi-grid { grid-template-columns: 1fr; }
  .news-layout { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}
@media (max-width: 767px) {
  .main-nav { display: none; }
  .header-actions .btn-sm { display: none; }
  .hamburger { display: flex; }
  .hero { min-height: auto; padding: 120px 0 48px; }
  .hero h1 { font-size: 30px; }
  .hero-sub { font-size: 16px; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .btn { width: 100%; }
  .hero-trust { gap: 16px; flex-direction: column; }
  .section { padding: 56px 0; }
  .section-title { font-size: 23px; }
  .pain-grid { grid-template-columns: 1fr; }
  .solution-side-cards { grid-template-columns: 1fr; }
  .timeline-steps { flex-direction: column; gap: 24px; }
  .timeline-step::after { display: none; }
  .stats-grid { grid-template-columns: 1fr; }
  .stats-grid .stat-card:last-child { grid-column: auto; }
  .cta-card { padding: 40px 24px; }
  .cta-card h2 { font-size: 24px; }
  .cta-actions { flex-direction: column; align-items: stretch; }
  .cta-actions .btn { width: 100%; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .news-list-item { padding: 12px; }
  .news-list-thumb { width: 80px; height: 64px; }
}
@media (max-width: 479px) {
  body { font-size: 14px; }
  .container { padding: 0 16px; }
  .hero h1 { font-size: 26px; }
  .btn { min-height: 44px; }
  .panel-grid { grid-template-columns: 1fr; }
  .solution-main-card { padding: 24px; }
  .solution-text-card { padding: 24px; }
  .news-list-thumb { display: none; }
  .news-list-info h4 { white-space: normal; }
  .news-list-info p { white-space: normal; }
}

/* roulang page: category1 */
:root {
      --bg-0: #04060D;
      --bg-1: #0A0F1E;
      --bg-card: rgba(16, 23, 43, 0.66);
      --e-cyan: #00E0C6;
      --e-cyan-dim: rgba(0, 224, 198, 0.12);
      --e-violet: #7C6CFF;
      --e-amber: #FFC164;
      --success: #34E0A1;
      --error: #FF6B6B;
      --text-1: #EAF0FA;
      --text-2: #A3B0C8;
      --text-3: #5D6C88;
      --line: rgba(255, 255, 255, 0.08);
      --line-strong: rgba(0, 224, 198, 0.35);
      --grad-main: linear-gradient(135deg, #00E0C6 0%, #00B4FF 100%);
      --grad-glow: 0 0 24px rgba(0, 224, 198, 0.35);
      --glass-bg: rgba(16, 23, 43, 0.66);
      --glass-border: rgba(255, 255, 255, 0.08);
      --radius-lg: 20px;
      --radius-md: 16px;
      --radius-sm: 10px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.28);
      --shadow-hover: 0 14px 44px rgba(0, 0, 0, 0.44), 0 0 0 1px var(--line-strong);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
      --container-w: 1200px;
      --nav-h: 68px;
    }

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

    html {
      scroll-behavior: smooth;
      scroll-padding-top: calc(var(--nav-h) + 20px);
    }

    body {
      background: var(--bg-0);
      color: var(--text-1);
      font-family: var(--font-sans);
      font-size: 15px;
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: color 0.25s ease;
    }

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

    button,
    input {
      font-family: inherit;
      border: none;
      outline: none;
      background: none;
    }

    button {
      cursor: pointer;
    }

    .container {
      width: 100%;
      max-width: var(--container-w);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* ---------- Header & Nav ---------- */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-h);
      background: rgba(4, 6, 13, 0.86);
      backdrop-filter: blur(8px);
      -webkit-backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--line);
      z-index: 100;
    }

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

    .logo-mark {
      display: flex;
      align-items: center;
      gap: 10px;
      flex-shrink: 0;
    }

    .logo-symbol {
      width: 34px;
      height: 34px;
      border-radius: 10px;
      background: var(--grad-main);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #04101C;
      font-weight: 800;
      font-size: 15px;
      box-shadow: 0 0 18px rgba(0, 224, 198, 0.4);
      transition: box-shadow 0.3s;
    }

    .logo-text {
      font-size: 20px;
      font-weight: 800;
      letter-spacing: 0.3px;
      color: #fff;
      display: flex;
      align-items: baseline;
      white-space: nowrap;
    }

    .logo-text .logo-word {
      color: #fff;
    }

    .logo-text .logo-suffix {
      background: var(--grad-main);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .main-nav {
      display: flex;
      align-items: center;
      gap: 28px;
    }

    .main-nav a {
      font-size: 14px;
      color: var(--text-2);
      line-height: var(--nav-h);
      position: relative;
      white-space: nowrap;
      transition: color 0.25s;
    }

    .main-nav a:hover {
      color: var(--text-1);
      box-shadow: 0 2px 12px rgba(0, 224, 198, 0.6);
    }

    .main-nav a.active {
      color: var(--e-cyan);
      box-shadow: 0 2px 12px rgba(0, 224, 198, 0.6);
    }

    .nav-cta {
      display: flex;
      align-items: center;
      gap: 16px;
      flex-shrink: 0;
    }

    .btn-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 12px 28px;
      background: var(--grad-main);
      color: #04101C;
      font-weight: 700;
      font-size: 14px;
      border-radius: var(--radius-sm);
      box-shadow: var(--grad-glow);
      transition: all 0.3s ease;
      border: none;
      cursor: pointer;
      line-height: 1.4;
    }

    .btn-primary:hover {
      filter: brightness(1.12);
      transform: translateY(-2px);
      box-shadow: 0 0 36px rgba(0, 224, 198, 0.5);
      color: #04101C;
    }

    .btn-primary:active {
      transform: scale(0.97);
    }

    .btn-primary:focus-visible {
      outline: 2px solid var(--e-cyan);
      outline-offset: 3px;
    }

    .btn-primary.small {
      padding: 8px 20px;
      font-size: 13px;
    }

    .btn-secondary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 12px 28px;
      background: transparent;
      color: var(--e-cyan);
      font-weight: 600;
      font-size: 14px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--line-strong);
      transition: all 0.3s ease;
      cursor: pointer;
      line-height: 1.4;
    }

    .btn-secondary:hover {
      background: var(--e-cyan-dim);
      border-color: var(--e-cyan);
      box-shadow: 0 0 20px rgba(0, 224, 198, 0.2);
      color: var(--e-cyan);
    }

    .btn-secondary:active {
      transform: scale(0.97);
    }

    .btn-secondary:focus-visible {
      outline: 2px solid var(--e-cyan);
      outline-offset: 3px;
    }

    .btn-ghost {
      color: var(--text-2);
      font-size: 14px;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: color 0.25s, gap 0.25s;
      border-bottom: 1px solid transparent;
    }

    .btn-ghost:hover {
      color: var(--e-cyan);
      gap: 10px;
      border-bottom-color: var(--e-cyan);
    }

    .btn-ghost:focus-visible {
      outline: 2px solid var(--e-cyan);
      outline-offset: 3px;
      border-radius: 4px;
    }

    .nav-glow-line {
      height: 1px;
      position: absolute;
      bottom: -1px;
      left: 0;
      right: 0;
      background: linear-gradient(90deg, var(--e-cyan) 0%, transparent 50%, var(--e-violet) 100%);
      pointer-events: none;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      width: 40px;
      height: 40px;
      justify-content: center;
      align-items: center;
      border-radius: 8px;
      cursor: pointer;
      background: transparent;
      border: none;
    }

    .hamburger span {
      display: block;
      width: 22px;
      height: 2px;
      background: var(--text-1);
      border-radius: 2px;
      transition: all 0.3s ease;
    }

    .hamburger.open span:nth-child(1) {
      transform: translateY(8px) rotate(45deg);
    }

    .hamburger.open span:nth-child(2) {
      opacity: 0;
    }

    .hamburger.open span:nth-child(3) {
      transform: translateY(-8px) rotate(-45deg);
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: var(--nav-h);
      left: 0;
      right: 0;
      background: rgba(4, 6, 13, 0.96);
      backdrop-filter: blur(20px);
      padding: 32px 24px 40px;
      z-index: 99;
      border-bottom: 1px solid var(--line);
    }

    .mobile-menu a {
      display: block;
      font-size: 18px;
      color: var(--text-2);
      padding: 12px 0;
      border-bottom: 1px solid var(--line);
      font-weight: 500;
      transition: color 0.2s;
    }

    .mobile-menu a.active {
      color: var(--e-cyan);
    }

    .mobile-menu .btn-primary {
      width: 100%;
      margin-top: 24px;
    }

    /* ---------- Page Hero ---------- */
    .page-hero {
      position: relative;
      padding: calc(var(--nav-h) + 64px) 0 64px;
      background-image: url('/assets/images/backpic/back-2.webp');
      background-size: cover;
      background-position: center;
      border-bottom: 1px solid var(--line);
    }

    .page-hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(ellipse at 20% 30%, rgba(4, 6, 13, 0.78) 0%, rgba(4, 6, 13, 0.62) 50%, rgba(4, 6, 13, 0.45) 100%);
      z-index: 0;
    }

    .page-hero .container {
      position: relative;
      z-index: 1;
    }

    .breadcrumb {
      font-size: 13px;
      color: var(--text-3);
      margin-bottom: 20px;
      display: flex;
      align-items: center;
      gap: 8px;
      flex-wrap: wrap;
    }

    .breadcrumb a {
      color: var(--text-3);
      transition: color 0.2s;
    }

    .breadcrumb a:hover {
      color: var(--e-cyan);
    }

    .breadcrumb .sep {
      opacity: 0.6;
    }

    .page-hero h1 {
      font-size: 42px;
      font-weight: 800;
      letter-spacing: 0.5px;
      line-height: 1.25;
      color: var(--text-1);
      margin-bottom: 12px;
    }

    .page-hero .hero-subtitle {
      font-size: 16px;
      color: var(--text-2);
      max-width: 560px;
    }

    /* ---------- Category Layout ---------- */
    .category-body {
      padding: 80px 0 48px;
    }

    .category-grid {
      display: grid;
      grid-template-columns: 8fr 4fr;
      gap: 32px;
      align-items: start;
    }

    .content-main {
      display: flex;
      flex-direction: column;
      gap: 32px;
      min-width: 0;
    }

    .content-sidebar {
      position: sticky;
      top: calc(var(--nav-h) + 32px);
      min-width: 0;
    }

    .section-card {
      background: var(--glass-bg);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg);
      padding: 32px;
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      box-shadow: var(--shadow-card);
      transition: border-color 0.3s, box-shadow 0.3s;
    }

    .section-card:hover {
      border-color: var(--line-strong);
      box-shadow: var(--shadow-hover);
    }

    .section-card h2 {
      font-size: 26px;
      font-weight: 700;
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 14px;
    }

    .section-card h2::before {
      content: '';
      width: 4px;
      height: 24px;
      border-radius: 2px;
      background: linear-gradient(180deg, var(--e-cyan) 0%, var(--e-violet) 100%);
      box-shadow: 0 0 12px rgba(0, 224, 198, 0.5);
      flex-shrink: 0;
    }

    .section-card h2.no-line::before {
      display: none;
    }

    .section-card h3 {
      font-size: 18px;
      font-weight: 600;
      margin: 24px 0 12px;
    }

    .section-card h3:first-child {
      margin-top: 0;
    }

    .section-card p {
      color: var(--text-2);
      margin-bottom: 16px;
      font-size: 15px;
    }

    .section-card p:last-child {
      margin-bottom: 0;
    }

    .section-card .feature-list {
      list-style: none;
      margin: 16px 0;
      display: grid;
      gap: 14px;
    }

    .section-card .feature-list li {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      color: var(--text-2);
      font-size: 15px;
    }

    .section-card .feature-list li i {
      color: var(--e-cyan);
      margin-top: 4px;
      font-size: 14px;
      width: 18px;
      text-align: center;
      flex-shrink: 0;
    }

    .section-card .feature-list li strong {
      color: var(--text-1);
      font-weight: 600;
    }

    .inline-img {
      border-radius: var(--radius-md);
      overflow: hidden;
      margin: 20px 0 8px;
      border: 1px solid var(--line);
    }

    .inline-img img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }

    .step-list {
      list-style: none;
      margin-top: 20px;
      counter-reset: step-counter;
      display: grid;
      gap: 16px;
    }

    .step-list li {
      counter-increment: step-counter;
      display: grid;
      grid-template-columns: 40px 1fr;
      gap: 16px;
      align-items: start;
    }

    .step-list li::before {
      content: counter(step-counter);
      width: 32px;
      height: 32px;
      border-radius: 50%;
      background: var(--e-cyan-dim);
      border: 1px solid var(--line-strong);
      color: var(--e-cyan);
      font-weight: 700;
      font-size: 14px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .step-list li .step-title {
      color: var(--text-1);
      font-weight: 600;
      margin-bottom: 4px;
      font-size: 15px;
    }

    .step-list li .step-desc {
      color: var(--text-3);
      font-size: 14px;
      line-height: 1.6;
    }

    .tip-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
      margin-top: 24px;
    }

    .tip-item {
      border: 1px solid var(--line);
      border-radius: var(--radius-md);
      padding: 18px;
      background: rgba(255, 255, 255, 0.02);
      transition: border-color 0.3s, background 0.3s;
    }

    .tip-item:hover {
      border-color: var(--line-strong);
      background: var(--e-cyan-dim);
    }

    .tip-item i {
      color: var(--e-violet);
      font-size: 20px;
      margin-bottom: 10px;
    }

    .tip-item .tip-title {
      color: var(--text-1);
      font-weight: 600;
      font-size: 15px;
      margin-bottom: 4px;
    }

    .tip-item p {
      color: var(--text-3);
      font-size: 13px;
      line-height: 1.6;
      margin: 0;
    }

    /* Sidebar */
    .sidebar-card {
      background: var(--glass-bg);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg);
      padding: 28px;
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      box-shadow: var(--shadow-card);
      position: sticky;
      top: calc(var(--nav-h) + 32px);
    }

    .sidebar-card h4 {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 20px;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .sidebar-card h4::before {
      content: '';
      width: 3px;
      height: 18px;
      border-radius: 2px;
      background: var(--grad-main);
    }

    .sidebar-nav {
      list-style: none;
      display: grid;
      gap: 6px;
    }

    .sidebar-nav a {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 10px 12px;
      border-radius: 8px;
      color: var(--text-2);
      font-size: 14px;
      transition: background 0.25s, color 0.25s, padding-left 0.25s;
    }

    .sidebar-nav a i {
      font-size: 12px;
      opacity: 0;
      transform: translateX(-4px);
      transition: opacity 0.25s, transform 0.25s;
    }

    .sidebar-nav a:hover {
      background: var(--e-cyan-dim);
      color: var(--e-cyan);
      padding-left: 16px;
    }

    .sidebar-nav a:hover i {
      opacity: 1;
      transform: translateX(0);
    }

    /* ---------- FAQ ---------- */
    .faq-section {
      padding: 64px 0 48px;
    }

    .faq-grid {
      max-width: 860px;
      margin: 0 auto;
    }

    .faq-item {
      background: var(--glass-bg);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-md);
      margin-bottom: 12px;
      overflow: hidden;
      backdrop-filter: blur(8px);
    }

    .faq-question {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 18px 22px;
      cursor: pointer;
      font-size: 15px;
      font-weight: 600;
      color: var(--text-1);
      transition: color 0.25s;
    }

    .faq-question:hover {
      color: var(--e-cyan);
    }

    .faq-icon {
      width: 24px;
      height: 24px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 18px;
      color: var(--e-cyan);
      transition: transform 0.3s;
      flex-shrink: 0;
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, opacity 0.3s ease;
      opacity: 0;
    }

    .faq-item.active .faq-answer {
      max-height: 220px;
      opacity: 1;
    }

    .faq-answer p {
      padding: 0 22px 18px;
      color: var(--text-2);
      font-size: 14px;
      line-height: 1.7;
      border-left: 2px solid var(--e-cyan);
      margin-left: 22px;
    }

    /* ---------- CTA Banner ---------- */
    .cta-section {
      padding: 56px 0 80px;
      position: relative;
    }

    .cta-section::before {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(ellipse at 50% 100%, rgba(0, 224, 198, 0.08) 0%, transparent 70%);
      pointer-events: none;
    }

    .cta-banner {
      background: var(--glass-bg);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg);
      backdrop-filter: blur(16px);
      padding: 56px 40px;
      text-align: center;
      position: relative;
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }

    .cta-banner h2 {
      font-size: 28px;
      font-weight: 800;
      margin-bottom: 12px;
    }

    .cta-banner h2 span {
      background: var(--grad-main);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .cta-banner p {
      color: var(--text-2);
      max-width: 440px;
      margin: 0 auto 32px;
    }

    .cta-buttons {
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
    }

    /* ---------- Bottom Link ---------- */
    .bottom-nav-cards {
      padding: 0 0 80px;
    }

    .bottom-nav-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }

    .bottom-nav-card {
      background: var(--glass-bg);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-md);
      padding: 28px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      transition: border-color 0.3s, box-shadow 0.3s, transform 0.3s;
    }

    .bottom-nav-card:hover {
      border-color: var(--line-strong);
      box-shadow: var(--shadow-hover);
      transform: translateY(-2px);
    }

    .bottom-nav-card .card-title {
      font-size: 16px;
      font-weight: 600;
      color: var(--text-1);
    }

    .bottom-nav-card .card-desc {
      font-size: 13px;
      color: var(--text-3);
      margin-top: 4px;
    }

    .bottom-nav-card i {
      color: var(--e-cyan);
      font-size: 20px;
      flex-shrink: 0;
      transition: transform 0.3s;
    }

    .bottom-nav-card:hover i {
      transform: translateX(6px);
    }

    /* ---------- Footer ---------- */
    .site-footer {
      background: var(--bg-0);
      border-top: 1px solid var(--line);
      position: relative;
    }

    .site-footer::before {
      content: '';
      position: absolute;
      top: -1px;
      left: 0;
      right: 0;
      height: 1px;
      background: linear-gradient(90deg, var(--e-cyan) 0%, transparent 50%, var(--e-violet) 100%);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1.5fr;
      gap: 48px;
      padding: 56px 0 40px;
    }

    .footer-logo {
      display: flex;
      align-items: baseline;
      gap: 0;
      font-size: 22px;
      font-weight: 800;
      margin-bottom: 16px;
    }

    .footer-logo .logo-word {
      color: #fff;
    }

    .footer-logo .logo-suffix {
      background: var(--grad-main);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .footer-desc {
      color: var(--text-3);
      font-size: 14px;
      line-height: 1.7;
      max-width: 320px;
    }

    .footer-title {
      color: var(--text-1);
      font-size: 16px;
      font-weight: 600;
      margin-bottom: 18px;
    }

    .footer-links {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .footer-links a {
      color: var(--text-3);
      font-size: 14px;
      transition: color 0.2s;
    }

    .footer-links a:hover {
      color: var(--e-cyan);
    }

    .footer-note {
      color: var(--text-3);
      font-size: 14px;
      line-height: 2;
    }

    .footer-bottom {
      border-top: 1px solid var(--line);
      padding: 20px 0;
      display: flex;
      justify-content: center;
    }

    .footer-bottom p {
      color: var(--text-3);
      font-size: 13px;
      text-align: center;
    }

    /* ---------- Animations ---------- */
    @keyframes fadeUp {
      from {
        opacity: 0;
        transform: translateY(24px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    .section-card {
      animation: fadeUp 0.6s ease both;
    }

    .section-card:nth-child(2) {
      animation-delay: 0.1s;
    }

    .section-card:nth-child(3) {
      animation-delay: 0.2s;
    }

    /* ---------- Responsive ---------- */
    @media (max-width: 1024px) {
      .category-grid {
        grid-template-columns: 1fr;
      }

      .content-sidebar {
        display: none;
      }

      .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
      }

      .page-hero h1 {
        font-size: 36px;
      }
    }

    @media (max-width: 767px) {
      .container {
        padding: 0 16px;
      }

      .main-nav {
        display: none;
      }

      .hamburger {
        display: flex;
      }

      .nav-cta .btn-primary {
        display: none;
      }

      .mobile-menu {
        display: block;
      }

      .page-hero {
        padding: calc(var(--nav-h) + 40px) 0 40px;
      }

      .page-hero h1 {
        font-size: 28px;
      }

      .hero-subtitle {
        font-size: 14px;
      }

      .category-body {
        padding: 48px 0 32px;
      }

      .section-card {
        padding: 22px;
      }

      .section-card h2 {
        font-size: 22px;
      }

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

      .bottom-nav-grid {
        grid-template-columns: 1fr;
      }

      .footer-grid {
        grid-template-columns: 1fr;
        gap: 24px;
        padding: 40px 0 28px;
      }

      .cta-banner {
        padding: 40px 24px;
      }

      .cta-banner h2 {
        font-size: 22px;
      }

      .faq-question {
        padding: 16px 16px;
        font-size: 14px;
      }

      .faq-answer p {
        padding: 0 16px 14px;
        margin-left: 16px;
      }
    }

    @media (max-width: 479px) {
      body {
        font-size: 14px;
      }

      .logo-text {
        font-size: 17px;
      }

      .logo-symbol {
        width: 30px;
        height: 30px;
        font-size: 13px;
      }

      .btn-primary,
      .btn-secondary {
        min-height: 44px;
        width: 100%;
      }

      .cta-buttons {
        flex-direction: column;
      }

      .step-list li {
        grid-template-columns: 32px 1fr;
        gap: 12px;
      }

      .step-list li::before {
        width: 28px;
        height: 28px;
        font-size: 12px;
      }
    }

/* roulang page: article */
:root {
  --bg-0: #04060D;
  --bg-1: #0A0F1E;
  --bg-card: rgba(16, 23, 43, 0.66);
  --e-cyan: #00E0C6;
  --e-cyan-dim: rgba(0, 224, 198, 0.12);
  --e-violet: #7C6CFF;
  --e-amber: #FFC164;
  --success: #34E0A1;
  --error: #FF6B6B;
  --text-1: #EAF0FA;
  --text-2: #A3B0C8;
  --text-3: #5D6C88;
  --line: rgba(255, 255, 255, 0.08);
  --line-strong: rgba(0, 224, 198, 0.35);
  --grad-main: linear-gradient(135deg, #00E0C6 0%, #00B4FF 100%);
  --grad-glow: 0 0 24px rgba(0, 224, 198, 0.35);
  --radius-card: 16px;
  --radius-btn: 10px;
  --container: 1200px;
  --font-main: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-main);
  background: var(--bg-0);
  color: var(--text-2);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; transition: color .2s ease; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
ul, ol { list-style-position: inside; }
.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-btn);
  font-weight: 700;
  font-size: 15px;
  line-height: 1.2;
  transition: all 0.25s ease;
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
}
.btn-primary {
  background: var(--grad-main);
  color: #04101C;
  box-shadow: var(--grad-glow);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 36px rgba(0, 224, 198, 0.5);
  filter: brightness(1.12);
}
.btn-primary:active { transform: scale(0.97); }
.btn-primary:focus-visible, .btn-secondary:focus-visible {
  outline: 2px solid var(--e-cyan);
  outline-offset: 3px;
}
.btn-secondary {
  background: transparent;
  border-color: var(--line-strong);
  color: var(--e-cyan);
}
.btn-secondary:hover {
  background: var(--e-cyan-dim);
  box-shadow: 0 0 20px rgba(0, 224, 198, 0.2);
}
.btn-sm { padding: 8px 20px; font-size: 14px; }
.btn-block { width: 100%; }

.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(4, 6, 13, 0.86);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.site-header::after {
  content: "";
  display: block;
  height: 1px;
  background: linear-gradient(90deg, var(--e-cyan), transparent 40%, transparent 60%, var(--e-violet));
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 22px;
  font-weight: 800;
  letter-spacing: 0.5px;
  flex-shrink: 0;
}
.logo-word { color: var(--text-1); }
.logo-suffix {
  background: var(--grad-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.site-logo:hover { filter: drop-shadow(0 0 12px rgba(0, 224, 198, 0.6)); }
.main-nav { display: flex; align-items: center; gap: 32px; }
.main-nav a {
  position: relative;
  font-size: 15px;
  color: var(--text-2);
  font-weight: 500;
  padding: 8px 0;
  transition: color 0.2s;
}
.main-nav a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--grad-main);
  box-shadow: 0 2px 12px rgba(0, 224, 198, 0.6);
  opacity: 0;
  transition: opacity 0.25s;
}
.main-nav a:hover { color: var(--text-1); }
.main-nav a:hover::after { opacity: 1; }
.main-nav a.active { color: var(--e-cyan); }
.main-nav a.active::after { opacity: 1; }
.header-actions { display: flex; align-items: center; gap: 16px; }
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  border-radius: 8px;
}
.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--text-1);
  border-radius: 2px;
  transition: all 0.3s ease;
}
.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-menu {
  display: none;
  position: fixed;
  top: 68px; left: 0; right: 0; bottom: 0;
  background: rgba(4, 6, 13, 0.96);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  z-index: 999;
  padding: 32px 24px 40px;
  flex-direction: column;
  justify-content: space-between;
}
.mobile-menu.open { display: flex; }
.mobile-nav { display: flex; flex-direction: column; }
.mobile-nav a {
  font-size: 22px;
  line-height: 3rem;
  color: var(--text-2);
  border-bottom: 1px solid var(--line);
  transition: color 0.2s;
}
.mobile-nav a:hover, .mobile-nav a.active { color: var(--e-cyan); }

.article-page {
  padding-top: 132px;
  padding-bottom: 20px;
  min-height: 70vh;
  position: relative;
}
.article-page::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 320px;
  background: url('/assets/images/backpic/back-2.webp') center 30% / cover no-repeat;
  opacity: 0.28;
  mask-image: linear-gradient(to bottom, rgba(0,0,0,0.7), transparent);
  -webkit-mask-image: linear-gradient(to bottom, rgba(0,0,0,0.7), transparent);
  pointer-events: none;
}
.article-wrap {
  max-width: 960px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13px;
  color: var(--text-3);
  margin-bottom: 20px;
}
.breadcrumb a { transition: color 0.2s; }
.breadcrumb a:hover { color: var(--e-cyan); }
.breadcrumb .sep { color: var(--text-3); opacity: 0.5; }
.breadcrumb .current {
  color: var(--text-3);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 42ch;
}

.article-card,
.article-empty {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  padding: 40px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.28);
}
.article-header {
  border-bottom: 1px solid var(--line);
  padding-bottom: 28px;
  margin-bottom: 32px;
}
.article-header h1 {
  font-size: 36px;
  line-height: 1.3;
  font-weight: 800;
  color: var(--text-1);
  letter-spacing: 0.5px;
  margin-bottom: 16px;
  word-break: break-word;
}
.article-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 13px;
  color: var(--text-3);
}
.badge {
  background: var(--e-cyan-dim);
  color: var(--e-cyan);
  font-size: 12px;
  font-weight: 500;
  padding: 4px 12px;
  border-radius: 20px;
  letter-spacing: 0.5px;
  display: inline-block;
}

.article-content {
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-2);
}
.article-content h2 {
  font-size: 26px;
  font-weight: 700;
  color: var(--text-1);
  margin: 36px 0 16px;
  padding-left: 16px;
  position: relative;
}
.article-content h2::before {
  content: "";
  position: absolute;
  left: 0; top: 4px; bottom: 4px;
  width: 4px;
  border-radius: 2px;
  background: var(--grad-main);
  box-shadow: 0 0 12px rgba(0, 224, 198, 0.4);
}
.article-content h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-1);
  margin: 28px 0 12px;
}
.article-content p { margin-bottom: 16px; }
.article-content ul, .article-content ol { margin: 0 0 16px 20px; }
.article-content li { margin-bottom: 8px; }
.article-content blockquote {
  border-left: 3px solid var(--e-cyan);
  background: rgba(255, 255, 255, 0.03);
  padding: 16px 20px;
  border-radius: 0 12px 12px 0;
  margin: 20px 0;
  color: var(--text-2);
}
.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  border-radius: 12px;
  overflow: hidden;
}
.article-content th {
  background: rgba(0, 224, 198, 0.08);
  color: var(--text-1);
  font-weight: 600;
  text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
}
.article-content td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
}
.article-content img {
  border-radius: 16px;
  border: 1px solid var(--line);
  margin: 20px 0;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.article-content a { color: var(--e-cyan); border-bottom: 1px solid transparent; }
.article-content a:hover { border-bottom-color: var(--e-cyan); }
.article-content code {
  background: #0D1425;
  color: var(--e-cyan);
  padding: 2px 8px;
  border-radius: 6px;
  font-size: 14px;
}
.article-content pre {
  background: #0D1425;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px;
  overflow-x: auto;
  margin: 20px 0;
}
.article-content pre code { background: none; padding: 0; }

.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}
.tag {
  background: var(--e-cyan-dim);
  color: var(--e-cyan);
  font-size: 12px;
  padding: 6px 14px;
  border-radius: 20px;
  border: 1px solid transparent;
  transition: all 0.25s;
}
.tag:hover {
  border-color: var(--line-strong);
  box-shadow: 0 0 12px rgba(0, 224, 198, 0.25);
}

.post-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 32px;
}
.post-nav-card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: all 0.25s;
}
.post-nav-card:hover {
  border-color: var(--line-strong);
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.35);
  transform: translateY(-2px);
}
.post-nav-label { font-size: 12px; color: var(--text-3); }
.post-nav-title { font-size: 14px; color: var(--text-1); font-weight: 600; word-break: break-word; }

.article-back {
  margin-top: 24px;
  text-align: center;
}
.link-arrow {
  color: var(--text-2);
  font-size: 14px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.25s;
}
.link-arrow:hover { color: var(--e-cyan); }
.link-arrow .arrow { transition: transform 0.25s; }
.link-arrow:hover .arrow { transform: translateX(4px); }

.article-empty {
  text-align: center;
  padding: 80px 40px;
}
.article-empty p {
  font-size: 18px;
  color: var(--text-2);
  margin-bottom: 24px;
}

.related-section {
  padding: 72px 0 24px;
}
.related-section .section-title {
  font-size: 26px;
  font-weight: 700;
  color: var(--text-1);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.related-section .section-title::before {
  content: "";
  width: 4px;
  height: 28px;
  border-radius: 2px;
  background: var(--grad-main);
  box-shadow: 0 0 12px rgba(0, 224, 198, 0.4);
}
.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 28px;
}
.related-card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  overflow: hidden;
  transition: all 0.3s;
  display: block;
}
.related-card:hover {
  border-color: var(--line-strong);
  transform: translateY(-4px);
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.4);
}
.related-card img {
  width: 100%;
  height: 160px;
  object-fit: cover;
}
.related-info { padding: 18px 20px; }
.related-info h3 {
  font-size: 15px;
  color: var(--text-1);
  font-weight: 600;
  margin-bottom: 6px;
}
.related-info p {
  font-size: 12px;
  color: var(--text-3);
  line-height: 1.6;
}

.cta-section {
  padding: 80px 0;
  background: var(--bg-1);
  position: relative;
  overflow: hidden;
}
.cta-section::before {
  content: "";
  position: absolute;
  top: 50%; left: 50%;
  width: 600px; height: 600px;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle, rgba(0, 224, 198, 0.08), transparent 60%);
  filter: blur(60px);
  pointer-events: none;
}
.cta-card {
  position: relative;
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 56px 40px;
  text-align: center;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.28);
}
.cta-card h2 {
  font-size: 28px;
  font-weight: 800;
  color: var(--text-1);
  margin-bottom: 12px;
}
.cta-card p {
  color: var(--text-2);
  margin-bottom: 28px;
}
.cta-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.site-footer {
  background: var(--bg-0);
  position: relative;
}
.site-footer::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--e-cyan), var(--e-violet));
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1.2fr;
  gap: 40px;
  padding: 56px 0 40px;
}
.footer-logo {
  display: flex;
  align-items: center;
  font-size: 22px;
  font-weight: 800;
  margin-bottom: 12px;
}
.footer-logo .logo-word { color: var(--text-1); }
.footer-logo .logo-suffix {
  background: var(--grad-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.footer-desc {
  font-size: 14px;
  color: var(--text-3);
  line-height: 1.7;
  max-width: 320px;
}
.footer-title {
  font-size: 15px;
  color: var(--text-1);
  font-weight: 600;
  margin-bottom: 16px;
}
.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-links a {
  font-size: 14px;
  color: var(--text-3);
  transition: color 0.2s;
}
.footer-links a:hover { color: var(--e-cyan); }
.footer-note {
  font-size: 13px;
  color: var(--text-3);
  line-height: 1.9;
}
.footer-bottom {
  border-top: 1px solid var(--line);
  padding: 20px 0;
  text-align: center;
  font-size: 13px;
  color: var(--text-3);
}

.back-top {
  position: fixed;
  bottom: 24px; right: 24px;
  z-index: 800;
  width: 44px; height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-card);
  border: 1px solid var(--line-strong);
  color: var(--e-cyan);
  font-size: 18px;
  border-radius: 50%;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
  transition: all 0.25s;
  opacity: 0;
  pointer-events: none;
}
.back-top.visible {
  opacity: 1;
  pointer-events: auto;
}
.back-top:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 24px rgba(0, 224, 198, 0.3);
}

@media (max-width: 1024px) {
  .related-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .main-nav { gap: 20px; }
}

@media (max-width: 767px) {
  .main-nav { display: none; }
  .nav-toggle { display: flex; }
  .header-actions .btn-primary { display: none; }
  .article-page { padding-top: 96px; }
  .article-wrap { padding: 0 16px; }
  .article-card, .article-empty { padding: 24px 20px; }
  .article-header h1 { font-size: 28px; }
  .article-content { font-size: 15px; }
  .article-content h2 { font-size: 22px; }
  .article-content h3 { font-size: 18px; }
  .breadcrumb .current { max-width: 24ch; }
  .post-nav { grid-template-columns: 1fr; }
  .related-grid { grid-template-columns: 1fr; }
  .related-card img { height: 140px; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; padding: 40px 0 32px; }
  .cta-card { padding: 36px 24px; }
  .cta-card h2 { font-size: 24px; }
  .cta-actions { flex-direction: column; }
  .cta-actions .btn { width: 100%; }
}

@media (max-width: 479px) {
  .article-content { font-size: 14px; }
  .btn, .btn-primary, .btn-secondary { min-height: 44px; }
  .breadcrumb { font-size: 12px; }
}

/* roulang page: category2 */
:root {
  --bg-0: #04060D;
  --bg-1: #0A0F1E;
  --bg-card: rgba(16, 23, 43, 0.66);
  --e-cyan: #00E0C6;
  --e-cyan-dim: rgba(0, 224, 198, 0.12);
  --e-violet: #7C6CFF;
  --e-amber: #FFC164;
  --success: #34E0A1;
  --error: #FF6B6B;
  --text-1: #EAF0FA;
  --text-2: #A3B0C8;
  --text-3: #5D6C88;
  --line: rgba(255, 255, 255, 0.08);
  --line-strong: rgba(0, 224, 198, 0.35);
  --grad-main: linear-gradient(135deg, #00E0C6 0%, #00B4FF 100%);
  --grad-glow: 0 0 24px rgba(0, 224, 198, 0.35);
  --font: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
  --radius-card: 16px;
  --radius-btn: 10px;
  --radius-tag: 20px;
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.28);
  --shadow-hover: 0 14px 44px rgba(0, 0, 0, 0.44);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  background: var(--bg-0);
  color: var(--text-1);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease, opacity 0.2s ease;
}

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

ul, ol {
  list-style: none;
}

.container {
  width: 1200px;
  max-width: 92%;
  margin: 0 auto;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--e-cyan);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(0, 224, 198, 0.15);
}

/* ===== Header ===== */
.main-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(4, 6, 13, 0.86);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
  height: 68px;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 20px;
}

.site-logo {
  display: inline-flex;
  align-items: center;
  font-size: 22px;
  font-weight: 800;
  letter-spacing: 0.5px;
  flex-shrink: 0;
}

.site-logo:hover {
  text-shadow: 0 0 20px rgba(0, 224, 198, 0.4);
}

.logo-word {
  color: #ffffff;
}

.logo-suffix {
  background: var(--grad-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 2px;
}

.main-nav a {
  display: block;
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-2);
  border-radius: 8px;
  position: relative;
  white-space: nowrap;
}

.main-nav a:hover {
  color: var(--text-1);
  box-shadow: 0 2px 12px rgba(0, 224, 198, 0.6);
}

.main-nav a.active {
  color: var(--e-cyan);
  box-shadow: 0 2px 12px rgba(0, 224, 198, 0.6);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 9px 22px;
  background: var(--grad-main);
  color: #04101C !important;
  font-size: 14px;
  font-weight: 700;
  border-radius: var(--radius-btn);
  box-shadow: var(--grad-glow);
  white-space: nowrap;
  transition: all 0.25s ease;
}

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 36px rgba(0, 224, 198, 0.5);
  color: #04101C !important;
}

.nav-cta:active {
  transform: scale(0.97);
}

.nav-glow {
  height: 1px;
  background: linear-gradient(90deg, var(--e-cyan), transparent 40%, transparent 60%, var(--e-violet));
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  border-radius: 8px;
  z-index: 1101;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-1);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease, background 0.3s ease;
}

.hamburger.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
  background: var(--e-cyan);
}

.hamburger.open span:nth-child(2) {
  opacity: 0;
}

.hamburger.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
  background: var(--e-cyan);
}

.mobile-menu {
  display: none;
  position: fixed;
  top: 68px;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(4, 6, 13, 0.96);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  flex-direction: column;
  padding: 40px 32px 32px;
  z-index: 1000;
  overflow-y: auto;
}

.mobile-menu.open {
  display: flex;
}

.mobile-menu a {
  font-size: 22px;
  font-weight: 600;
  color: var(--text-2);
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.mobile-menu a:hover,
.mobile-menu a.active {
  color: var(--e-cyan);
}

.mobile-menu .mobile-cta {
  margin-top: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 24px;
  background: var(--grad-main);
  color: #04101C !important;
  font-weight: 700;
  border-radius: var(--radius-btn);
  font-size: 16px;
  box-shadow: var(--grad-glow);
  border-bottom: none;
}

/* ===== Page Hero ===== */
.page-hero {
  position: relative;
  margin-top: 68px;
  min-height: 260px;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, rgba(4, 6, 13, 0.92) 0%, rgba(4, 6, 13, 0.72) 55%, rgba(4, 6, 13, 0.5) 100%), url("/assets/images/backpic/back-2.webp") center center / cover no-repeat;
  border-bottom: 1px solid var(--line);
}

.page-hero::after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--e-cyan), transparent 50%, var(--e-violet));
}

.page-hero-inner {
  padding: 56px 0 64px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-3);
  margin-bottom: 18px;
}

.breadcrumb a {
  color: var(--text-3);
}

.breadcrumb a:hover {
  color: var(--e-cyan);
}

.breadcrumb .sep {
  color: var(--text-3);
}

.breadcrumb .current {
  color: var(--text-2);
}

.page-hero h1 {
  font-size: 38px;
  font-weight: 800;
  letter-spacing: 0.5px;
  color: var(--text-1);
  line-height: 1.3;
  margin-bottom: 10px;
}

.page-hero h1 span {
  background: var(--grad-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-sub {
  font-size: 15px;
  color: var(--text-2);
  max-width: 640px;
}

/* ===== Main Section ===== */
.main-section {
  padding: 72px 0 48px;
  background: linear-gradient(180deg, var(--bg-0) 0%, var(--bg-1) 50%, var(--bg-0) 100%);
}

.main-wrapper {
  display: grid;
  grid-template-columns: 8fr 4fr;
  gap: 28px;
  align-items: start;
}

/* ===== Content Cards ===== */
.content-main {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.section-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  padding: 30px 32px;
  box-shadow: var(--shadow-card);
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
  scroll-margin-top: 100px;
}

.section-card:hover {
  border-color: var(--line-strong);
  box-shadow: var(--shadow-hover);
}

.section-head {
  margin-bottom: 18px;
}

.section-head h2 {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-1);
  position: relative;
  padding-left: 18px;
  line-height: 1.4;
  margin-bottom: 6px;
}

.section-head h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 3px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--e-cyan), var(--e-violet));
  box-shadow: 0 0 12px rgba(0, 224, 198, 0.5);
}

.section-desc {
  font-size: 14px;
  color: var(--text-2);
  line-height: 1.7;
}

.section-body {
  font-size: 15px;
  color: var(--text-2);
  line-height: 1.8;
}

.section-body p {
  margin-bottom: 14px;
}

.section-body p:last-child {
  margin-bottom: 0;
}

.section-img {
  border-radius: 14px;
  border: 1px solid var(--line);
  margin-top: 20px;
  width: 100%;
  object-fit: cover;
  max-height: 340px;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.25);
}

/* ===== Steps ===== */
.steps-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 18px;
}

.step-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 18px 20px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--line);
  border-radius: 12px;
  transition: border-color 0.3s ease, background 0.3s ease, transform 0.3s ease;
}

.step-item:hover {
  border-color: var(--line-strong);
  background: var(--e-cyan-dim);
  transform: translateX(4px);
}

.step-num {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: var(--e-cyan-dim);
  color: var(--e-cyan);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.3px;
  border: 1px solid rgba(0, 224, 198, 0.3);
}

.step-body h4 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-1);
  margin-bottom: 4px;
}

.step-body p {
  font-size: 14px;
  color: var(--text-2);
  line-height: 1.7;
}

/* ===== Feature Grid ===== */
.feature-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 20px;
}

.feature-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 16px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--line);
  border-radius: 12px;
  transition: all 0.3s ease;
}

.feature-item:hover {
  border-color: var(--line-strong);
  background: rgba(0, 224, 198, 0.06);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.feature-icon {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  border-radius: 9px;
  background: var(--e-cyan-dim);
  color: var(--e-cyan);
  border: 1px solid rgba(0, 224, 198, 0.25);
}

.feature-text h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-1);
  margin-bottom: 3px;
}

.feature-text p {
  font-size: 13px;
  color: var(--text-2);
  line-height: 1.6;
}

/* ===== Tip List ===== */
.tip-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 16px;
}

.tip-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 13px 16px;
  background: rgba(255, 255, 255, 0.02);
  border-left: 3px solid var(--e-cyan);
  border-radius: 0 10px 10px 0;
  font-size: 14px;
  color: var(--text-2);
  line-height: 1.7;
  transition: background 0.3s ease, border-color 0.3s ease;
}

.tip-item:hover {
  background: var(--e-cyan-dim);
  border-left-color: var(--e-cyan);
}

.tip-item::before {
  content: "✦";
  color: var(--e-cyan);
  font-size: 13px;
  margin-top: 2px;
  flex-shrink: 0;
}

/* ===== Aside Bar ===== */
.aside-bar {
  position: relative;
}

.page-nav-card {
  position: sticky;
  top: 96px;
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  padding: 26px 24px;
  box-shadow: var(--shadow-card);
}

.page-nav-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-1);
  padding-bottom: 14px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--line);
  position: relative;
}

.page-nav-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 48px;
  height: 2px;
  background: var(--grad-main);
  border-radius: 2px;
}

.nav-anchors {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.anchor-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  font-size: 14px;
  color: var(--text-2);
  border-radius: 8px;
  transition: all 0.2s ease;
}

.anchor-link::after {
  content: "→";
  opacity: 0;
  transform: translateX(-6px);
  transition: all 0.2s ease;
  color: var(--e-cyan);
}

.anchor-link:hover {
  color: var(--e-cyan);
  background: rgba(0, 224, 198, 0.06);
}

.anchor-link:hover::after {
  opacity: 1;
  transform: translateX(0);
}

.aside-note {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  color: var(--text-3);
  line-height: 1.6;
}

.aside-note strong {
  color: var(--text-2);
  font-weight: 600;
}

/* ===== Link Cards ===== */
.link-cards-section {
  padding: 24px 0 72px;
  background: var(--bg-0);
}

.link-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.link-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 28px 28px;
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  transition: all 0.3s ease;
}

.link-card:hover {
  border-color: var(--line-strong);
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
}

.link-card-info h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-1);
  margin-bottom: 5px;
}

.link-card-info p {
  font-size: 13px;
  color: var(--text-3);
}

.link-card-arrow {
  font-size: 22px;
  color: var(--e-cyan);
  transition: transform 0.3s ease;
}

.link-card:hover .link-card-arrow {
  transform: translateX(6px);
}

/* ===== CTA Section ===== */
.cta-section {
  padding: 64px 0;
  background: radial-gradient(circle at 50% 50%, rgba(0, 224, 198, 0.08), transparent 70%);
  background-color: var(--bg-1);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.cta-card {
  position: relative;
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
  padding: 52px 40px;
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: var(--shadow-card), 0 0 60px rgba(0, 224, 198, 0.06);
  overflow: hidden;
}

.cta-card::before {
  content: "";
  position: absolute;
  top: -60px;
  right: -60px;
  width: 160px;
  height: 160px;
  border-radius: 50%;
  background: rgba(0, 224, 198, 0.1);
  filter: blur(40px);
}

.cta-card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--e-cyan), var(--e-violet), transparent);
}

.cta-title {
  font-size: 28px;
  font-weight: 800;
  color: var(--text-1);
  line-height: 1.4;
  margin-bottom: 12px;
}

.cta-title span {
  background: var(--grad-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.cta-desc {
  font-size: 15px;
  color: var(--text-2);
  margin-bottom: 28px;
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
}

.cta-buttons {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 30px;
  background: var(--grad-main);
  color: #04101C;
  font-size: 15px;
  font-weight: 700;
  border-radius: var(--radius-btn);
  box-shadow: var(--grad-glow);
  transition: all 0.25s ease;
  white-space: nowrap;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 36px rgba(0, 224, 198, 0.5);
  color: #04101C;
}

.btn-primary:active {
  transform: scale(0.97);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 28px;
  background: transparent;
  color: var(--e-cyan);
  font-size: 14px;
  font-weight: 600;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-btn);
  transition: all 0.25s ease;
  white-space: nowrap;
}

.btn-secondary:hover {
  background: var(--e-cyan-dim);
  box-shadow: 0 0 16px rgba(0, 224, 198, 0.15);
  color: var(--e-cyan);
}

.btn-secondary:active {
  transform: scale(0.97);
}

/* ===== Footer ===== */
.site-footer {
  background: var(--bg-0);
  border-top: 1px solid var(--line);
  padding: 48px 0 24px;
  position: relative;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--e-cyan), transparent 40%, transparent 60%, var(--e-violet));
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 32px;
}

.footer-logo {
  display: inline-flex;
  align-items: center;
  font-size: 22px;
  font-weight: 800;
  margin-bottom: 10px;
}

.footer-logo .logo-word {
  color: #fff;
}

.footer-logo .logo-suffix {
  background: var(--grad-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.footer-desc {
  font-size: 13px;
  color: var(--text-3);
  line-height: 1.7;
  margin-top: 8px;
  max-width: 320px;
}

.footer-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-1);
  margin-bottom: 16px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  font-size: 13px;
  color: var(--text-3);
  transition: all 0.2s ease;
}

.footer-links a:hover {
  color: var(--e-cyan);
  padding-left: 4px;
}

.footer-note {
  font-size: 13px;
  color: var(--text-3);
  line-height: 2;
}

.footer-bottom {
  border-top: 1px solid var(--line);
  padding-top: 20px;
  text-align: center;
}

.footer-bottom p {
  font-size: 12px;
  color: var(--text-3);
}

/* ===== Responsive ===== */
@media (max-width: 1199px) {
  .container {
    max-width: 94%;
  }

  .main-wrapper {
    grid-template-columns: 7fr 5fr;
  }

  .page-nav-card {
    padding: 20px 18px;
  }
}

@media (max-width: 1024px) {
  .main-nav {
    gap: 0;
  }

  .main-nav a {
    padding: 8px 10px;
    font-size: 13px;
  }

  .nav-cta {
    padding: 8px 16px;
    font-size: 13px;
  }

  .main-wrapper {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .aside-bar {
    order: 2;
  }

  .page-nav-card {
    position: static;
    top: auto;
  }

  .nav-anchors {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .anchor-link {
    flex: 1 1 calc(50% - 8px);
    justify-content: space-between;
  }
}

@media (max-width: 767px) {
  .main-header {
    height: 60px;
  }

  .header-inner {
    height: 60px;
  }

  .site-logo {
    font-size: 18px;
  }

  .main-nav {
    display: none !important;
  }

  .nav-cta {
    display: none !important;
  }

  .hamburger {
    display: inline-flex;
  }

  .page-hero {
    margin-top: 60px;
    min-height: 220px;
  }

  .page-hero-inner {
    padding: 40px 0 48px;
  }

  .page-hero h1 {
    font-size: 30px;
  }

  .hero-sub {
    font-size: 14px;
  }

  .main-section {
    padding: 48px 0 32px;
  }

  .section-card {
    padding: 20px 18px;
  }

  .section-head h2 {
    font-size: 20px;
  }

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

  .step-item {
    flex-direction: column;
    gap: 10px;
  }

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

  .cta-section {
    padding: 40px 0;
  }

  .cta-card {
    padding: 36px 20px;
  }

  .cta-title {
    font-size: 22px;
  }

  .cta-buttons {
    flex-direction: column;
    width: 100%;
  }

  .btn-primary,
  .btn-secondary {
    width: 100%;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .page-nav-card {
    padding: 18px 16px;
  }

  .nav-anchors {
    flex-direction: column;
  }

  .anchor-link {
    flex: 1 1 auto;
  }
}

@media (max-width: 479px) {
  body {
    font-size: 14px;
  }

  .page-hero h1 {
    font-size: 26px;
  }

  .hero-sub {
    font-size: 13px;
  }

  .section-head h2 {
    font-size: 18px;
  }

  .section-body {
    font-size: 14px;
  }

  .step-num {
    width: 36px;
    height: 36px;
    font-size: 14px;
  }

  .btn-primary,
  .btn-secondary {
    min-height: 44px;
  }

  .feature-item {
    flex-direction: column;
  }

  .feature-icon {
    width: 34px;
    height: 34px;
  }

  .cta-title {
    font-size: 20px;
  }

  .footer-logo {
    font-size: 19px;
  }
}

/* roulang page: category3 */
:root {
  --bg-0: #04060D;
  --bg-1: #0A0F1E;
  --bg-card: rgba(16, 23, 43, 0.66);
  --e-cyan: #00E0C6;
  --e-cyan-dim: rgba(0, 224, 198, 0.12);
  --e-violet: #7C6CFF;
  --e-amber: #FFC164;
  --success: #34E0A1;
  --error: #FF6B6B;
  --text-1: #EAF0FA;
  --text-2: #A3B0C8;
  --text-3: #5D6C88;
  --line: rgba(255, 255, 255, 0.08);
  --line-strong: rgba(0, 224, 198, 0.35);
  --grad-main: linear-gradient(135deg, #00E0C6 0%, #00B4FF 100%);
  --grad-glow: 0 0 24px rgba(0, 224, 198, 0.35);
  --glass: blur(16px);
  --radius-card: 16px;
  --radius-btn: 10px;
  --radius-tag: 20px;
  --radius-input: 8px;
  --radius-img: 20px;
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.28);
  --shadow-hover: 0 14px 44px rgba(0, 0, 0, 0.44);
  --font-main: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  background: var(--bg-0);
  color: var(--text-1);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--e-cyan);
  text-decoration: none;
  transition: color 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease, transform 0.25s ease;
}

a:hover {
  color: var(--e-cyan);
}

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

ul,
ol {
  list-style: none;
}

button,
input,
select,
textarea {
  font-family: inherit;
  font-size: inherit;
  border: none;
  outline: none;
  background: none;
}

:focus-visible {
  outline: 2px solid var(--e-cyan);
  outline-offset: 2px;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Header / Nav ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(4, 6, 13, 0.86);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 20px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 22px;
  font-weight: 800;
  letter-spacing: 0.5px;
  white-space: nowrap;
  color: var(--text-1);
  transition: text-shadow 0.3s ease;
}

.logo:hover {
  text-shadow: 0 0 20px rgba(0, 224, 198, 0.4);
}

.logo-word {
  color: #EAF0FA;
  font-weight: 800;
}

.logo-suffix {
  background: var(--grad-main);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 800;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.main-nav a {
  position: relative;
  color: var(--text-2);
  font-size: 15px;
  font-weight: 500;
  padding: 8px 2px;
  transition: color 0.25s ease;
}

.main-nav a:hover {
  color: var(--text-1);
  box-shadow: 0 2px 12px rgba(0, 224, 198, 0.6);
  position: relative;
}

.main-nav a.active {
  color: var(--e-cyan);
  box-shadow: 0 2px 12px rgba(0, 224, 198, 0.6);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--grad-main);
  color: #04101C;
  font-weight: 700;
  padding: 12px 28px;
  border-radius: var(--radius-btn);
  box-shadow: var(--grad-glow);
  transition: all 0.28s ease;
  cursor: pointer;
  text-align: center;
  line-height: 1.4;
  white-space: nowrap;
}

.btn:hover {
  filter: brightness(1.12);
  transform: translateY(-2px);
  box-shadow: 0 0 36px rgba(0, 224, 198, 0.5);
  color: #04101C;
}

.btn:active {
  transform: scale(0.97);
}

.btn-sm {
  padding: 8px 20px;
  font-size: 14px;
  border-radius: 8px;
}

.btn-secondary {
  background: transparent;
  border: 1px solid var(--line-strong);
  color: var(--e-cyan);
  box-shadow: none;
}

.btn-secondary:hover {
  background: var(--e-cyan-dim);
  border-color: var(--e-cyan);
  color: var(--e-cyan);
  box-shadow: 0 0 20px rgba(0, 224, 198, 0.25);
  filter: none;
}

.btn-block {
  display: flex;
  width: 100%;
  justify-content: center;
}

.nav-neon-line {
  height: 1px;
  background: linear-gradient(90deg, var(--e-cyan) 0%, transparent 50%, var(--e-violet) 100%);
}

.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  width: 40px;
  height: 40px;
  gap: 6px;
  border-radius: 8px;
  padding: 0 8px;
  cursor: pointer;
  color: var(--text-2);
  background: transparent;
}

.menu-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text-1);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease, background 0.3s ease;
}

.menu-toggle.active span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

.mobile-drawer {
  display: none;
  position: fixed;
  top: 68px;
  left: 0;
  right: 0;
  background: rgba(4, 6, 13, 0.96);
  backdrop-filter: blur(20px);
  padding: 24px 32px 40px;
  flex-direction: column;
  gap: 4px;
  border-bottom: 1px solid var(--line);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
  z-index: 999;
}

.mobile-drawer.open {
  display: flex;
}

.mobile-drawer a {
  color: var(--text-2);
  font-size: 20px;
  font-weight: 600;
  padding: 12px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  transition: color 0.25s ease, padding-left 0.25s ease;
}

.mobile-drawer a:hover,
.mobile-drawer a.active {
  color: var(--e-cyan);
  padding-left: 8px;
}

.mobile-drawer .btn {
  margin-top: 20px;
}

/* ===== Hero Banner ===== */
.hero-banner {
  position: relative;
  padding: 120px 0 56px;
  margin-top: 68px;
  background: url('/assets/images/backpic/back-2.webp') center / cover no-repeat;
  border-bottom: 1px solid var(--line);
}

.hero-banner::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 20% 20%, rgba(4, 6, 13, 0.55) 0%, rgba(4, 6, 13, 0.82) 60%);
}

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

.breadcrumb {
  font-size: 13px;
  color: var(--text-3);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.breadcrumb a {
  color: var(--text-3);
  transition: color 0.25s ease;
}

.breadcrumb a:hover {
  color: var(--e-cyan);
}

.breadcrumb .sep {
  color: var(--text-3);
  opacity: 0.6;
}

.page-title {
  font-size: 44px;
  font-weight: 800;
  letter-spacing: 0.5px;
  line-height: 1.25;
  margin-bottom: 14px;
}

.page-title .grad-text {
  background: var(--grad-main);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.page-subtitle {
  font-size: 17px;
  color: var(--text-2);
  max-width: 640px;
  line-height: 1.75;
}

.hero-badges {
  display: flex;
  gap: 12px;
  margin-top: 24px;
  flex-wrap: wrap;
}

.tag-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.5px;
  padding: 6px 16px;
  border-radius: var(--radius-tag);
  background: var(--e-cyan-dim);
  color: var(--e-cyan);
  border: 1px solid transparent;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.tag-badge:hover {
  border-color: var(--line-strong);
  box-shadow: 0 0 16px rgba(0, 224, 198, 0.2);
}

/* ===== Main Layout ===== */
.main-wrap {
  padding: 72px 0;
}

.layout-main {
  display: grid;
  grid-template-columns: 8fr 4fr;
  gap: 40px;
  align-items: start;
}

.section-block {
  scroll-margin-top: 96px;
}

.block-title {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 26px;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 10px;
  color: var(--text-1);
}

.block-title::before {
  content: "";
  width: 40px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(135deg, var(--e-cyan), var(--e-violet));
  flex-shrink: 0;
  box-shadow: 0 0 12px rgba(0, 224, 198, 0.5);
}

.block-desc {
  font-size: 15px;
  color: var(--text-3);
  margin-bottom: 28px;
  padding-left: 54px;
  line-height: 1.7;
}

.content-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  padding: 28px;
  box-shadow: var(--shadow-card);
  margin-bottom: 28px;
  transition: border-color 0.3s ease, box-shadow 0.3s ease, transform 0.3s ease;
}

.content-card:hover {
  border-color: var(--line-strong);
  box-shadow: var(--shadow-hover);
}

.content-card h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-1);
  margin-bottom: 12px;
}

.content-card p {
  font-size: 15px;
  color: var(--text-2);
  line-height: 1.75;
  margin-bottom: 16px;
}

.content-card p:last-child {
  margin-bottom: 0;
}

.card-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 4px;
}

.card-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 12px;
  font-size: 14px;
  color: var(--text-2);
  line-height: 1.65;
  transition: border-color 0.25s ease, background 0.25s ease;
}

.card-list li:hover {
  border-color: rgba(0, 224, 198, 0.25);
  background: rgba(0, 224, 198, 0.05);
}

.card-list .li-icon {
  width: 24px;
  height: 24px;
  border-radius: 6px;
  background: var(--e-cyan-dim);
  color: var(--e-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  flex-shrink: 0;
}

.step-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  counter-reset: step;
}

.step-list li {
  counter-increment: step;
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 14px 16px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 12px;
  font-size: 14px;
  color: var(--text-2);
  line-height: 1.65;
  transition: border-color 0.25s ease, background 0.25s ease;
}

.step-list li:hover {
  border-color: rgba(0, 224, 198, 0.25);
  background: rgba(0, 224, 198, 0.05);
}

.step-list li::before {
  content: counter(step, decimal-leading-zero);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--grad-main);
  color: #04101C;
  font-weight: 800;
  font-size: 13px;
  flex-shrink: 0;
}

.img-frame {
  border-radius: var(--radius-img);
  overflow: hidden;
  border: 1px solid var(--line);
  margin-top: 16px;
}

.img-frame img {
  width: 100%;
  height: 300px;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.img-frame:hover img {
  transform: scale(1.02);
}

/* ===== Sidebar ===== */
.side-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  padding: 24px;
  box-shadow: var(--shadow-card);
  position: sticky;
  top: 96px;
}

.side-card-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-1);
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.side-card-title::before {
  content: "";
  width: 3px;
  height: 18px;
  border-radius: 3px;
  background: var(--grad-main);
  box-shadow: 0 0 10px rgba(0, 224, 198, 0.5);
}

.side-nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.side-nav a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 11px 14px;
  border-radius: 10px;
  color: var(--text-2);
  font-size: 14px;
  border: 1px solid transparent;
  transition: all 0.25s ease;
}

.side-nav a span {
  opacity: 0;
  transform: translateX(-6px);
  transition: all 0.25s ease;
  color: var(--e-cyan);
  font-size: 16px;
}

.side-nav a:hover,
.side-nav a:focus-visible {
  background: var(--e-cyan-dim);
  color: var(--e-cyan);
  border-color: rgba(0, 224, 198, 0.25);
}

.side-nav a:hover span {
  opacity: 1;
  transform: translateX(0);
}

/* ===== FAQ ===== */
.faq-wrap {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-left: 54px;
}

.faq-item {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.faq-item:hover {
  border-color: rgba(0, 224, 198, 0.25);
}

.faq-q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 22px;
  cursor: pointer;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-1);
  transition: color 0.25s ease;
}

.faq-q:hover {
  color: var(--e-cyan);
}

.faq-q .faq-icon {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--e-cyan-dim);
  color: var(--e-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 400;
  flex-shrink: 0;
  transition: transform 0.3s ease, background 0.3s ease;
}

.faq-item.active .faq-q .faq-icon {
  transform: rotate(45deg);
  background: rgba(0, 224, 198, 0.2);
}

.faq-a {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, opacity 0.3s ease, padding 0.3s ease;
}

.faq-item.active .faq-a {
  max-height: 400px;
  opacity: 1;
  padding: 0 22px 20px;
}

.faq-a-inner {
  padding-left: 16px;
  border-left: 2px solid var(--e-cyan);
  font-size: 15px;
  color: var(--text-2);
  line-height: 1.75;
}

/* ===== Bottom CTA ===== */
.bottom-cta {
  padding: 56px 0 72px;
  background: var(--bg-1);
  border-top: 1px solid var(--line);
  position: relative;
}

.bottom-cta::before {
  content: "";
  position: absolute;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 300px;
  background: radial-gradient(circle, rgba(0, 224, 198, 0.08), transparent 70%);
  pointer-events: none;
}

.cta-card {
  position: relative;
  background: var(--bg-card);
  backdrop-filter: blur(18px);
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 48px;
  text-align: center;
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.cta-card::before {
  content: "";
  position: absolute;
  top: -90px;
  right: -90px;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  border: 2px solid rgba(0, 224, 198, 0.2);
  background: radial-gradient(circle, rgba(0, 224, 198, 0.1), transparent 70%);
}

.cta-card h2 {
  font-size: 28px;
  font-weight: 800;
  color: var(--text-1);
  margin-bottom: 12px;
  line-height: 1.4;
}

.cta-card h2 .grad-text {
  background: var(--grad-main);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.cta-card .cta-desc {
  font-size: 15px;
  color: var(--text-2);
  margin-bottom: 28px;
}

.cta-btns {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* ===== Page Changer ===== */
.changer-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.changer-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  padding: 24px 28px;
  transition: all 0.3s ease;
  color: var(--text-1);
}

.changer-link:hover {
  border-color: var(--line-strong);
  box-shadow: var(--shadow-hover);
  color: var(--e-cyan);
  transform: translateY(-3px);
}

.changer-link .changer-text {
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
}

.changer-link .changer-sub {
  display: block;
  font-size: 13px;
  color: var(--text-3);
  margin-top: 4px;
}

.changer-link .changer-arrow {
  font-size: 24px;
  color: var(--e-cyan);
  flex-shrink: 0;
  transition: transform 0.3s ease;
}

.changer-link:hover .changer-arrow {
  transform: translateX(6px);
}

/* ===== Footer ===== */
.site-footer {
  background: var(--bg-0);
  border-top: 1px solid var(--line);
  position: relative;
  padding: 60px 0 30px;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--e-cyan), transparent 40%, transparent 60%, var(--e-violet));
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1.2fr;
  gap: 48px;
  margin-bottom: 40px;
}

.footer-logo {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 22px;
  font-weight: 800;
  margin-bottom: 14px;
}

.footer-logo .logo-word {
  color: var(--text-1);
}

.footer-logo .logo-suffix {
  background: var(--grad-main);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.footer-desc {
  font-size: 14px;
  color: var(--text-3);
  line-height: 1.8;
  max-width: 380px;
}

.footer-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-1);
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  color: var(--text-3);
  font-size: 14px;
  transition: color 0.25s ease, padding-left 0.25s ease;
}

.footer-links a:hover {
  color: var(--e-cyan);
  padding-left: 6px;
}

.footer-note {
  font-size: 14px;
  color: var(--text-3);
  line-height: 2;
}

.footer-bottom {
  border-top: 1px solid var(--line);
  padding-top: 24px;
  text-align: center;
  font-size: 13px;
  color: var(--text-3);
}

.footer-bottom a {
  color: var(--text-3);
}

.footer-bottom a:hover {
  color: var(--e-cyan);
}

/* ===== Responsive ===== */
@media (max-width: 1199px) {
  .layout-main {
    grid-template-columns: 7fr 5fr;
    gap: 28px;
  }

  .container {
    padding: 0 20px;
  }

  .hero-banner {
    padding: 100px 0 48px;
  }

  .page-title {
    font-size: 38px;
  }
}

@media (max-width: 1024px) {
  .main-nav {
    gap: 20px;
  }

  .layout-main {
    grid-template-columns: 1fr;
  }

  .side-card {
    position: static;
    order: -1;
  }

  .side-nav {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 8px;
  }

  .side-nav a {
    width: calc(50% - 4px);
  }

  .side-nav a span {
    display: none;
  }

  .footer-grid {
    gap: 32px;
  }
}

@media (max-width: 767px) {
  .site-header {
    height: auto;
  }

  .header-inner {
    height: 64px;
  }

  .main-nav,
  .header-actions .btn {
    display: none;
  }

  .menu-toggle {
    display: flex;
  }

  .hero-banner {
    padding: 72px 0 40px;
    margin-top: 64px;
  }

  .page-title {
    font-size: 30px;
  }

  .page-subtitle {
    font-size: 15px;
  }

  .block-title {
    font-size: 22px;
  }

  .block-desc {
    padding-left: 0;
  }

  .faq-wrap {
    padding-left: 0;
  }

  .content-card {
    padding: 22px;
  }

  .img-frame img {
    height: 220px;
  }

  .cta-card {
    padding: 32px 24px;
  }

  .cta-card h2 {
    font-size: 24px;
  }

  .cta-btns {
    flex-direction: column;
  }

  .cta-btns .btn {
    width: 100%;
  }

  .changer-links {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .main-wrap {
    padding: 48px 0;
  }
}

@media (max-width: 520px) {
  .header-inner {
    padding: 0 16px;
  }

  .container {
    padding: 0 16px;
  }

  .logo {
    font-size: 18px;
  }

  .page-title {
    font-size: 26px;
  }

  .hero-badges {
    gap: 8px;
  }

  .tag-badge {
    padding: 5px 12px;
    font-size: 11px;
  }

  .card-list li,
  .step-list li {
    padding: 12px;
    font-size: 13px;
  }

  .block-title {
    font-size: 20px;
  }

  .content-card {
    padding: 18px;
  }

  .faq-q {
    padding: 16px;
    font-size: 15px;
  }

  .faq-a-inner {
    font-size: 14px;
  }

  .btn {
    min-height: 44px;
  }
}