/* roulang page: index */
/* ============ 设计变量 ============ */
:root {
  --primary: #0A1A2F;
  --accent: #00D4FF;
  --accent-b: #7CFC00;
  --bg-deep: #04101F;
  --surface: rgba(255,255,255,0.06);
  --surface-hover: rgba(255,255,255,0.12);
  --text-main: #E6F1FF;
  --text-sub: #9BB0C8;
  --text-body: #B8C9E0;
  --border: rgba(255,255,255,0.14);
  --radius-lg: 20px;
  --radius-md: 16px;
  --radius-sm: 8px;
  --radius-xs: 4px;
  --shadow-card: 0 8px 32px rgba(0,0,0,0.35);
  --shadow-hover: 0 12px 40px rgba(0,0,0,0.5);
  --shadow-btn: 0 0 20px rgba(0,212,255,0.45);
  --shadow-btn-hover: 0 0 30px rgba(0,212,255,0.7);
  --space-section: 80px;
  --space-mobile: 40px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
}

/* ============ 基础 Reset ============ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-body);
  background-color: var(--primary);
  background-image:
    radial-gradient(ellipse at 80% 20%, rgba(0,212,255,0.05), transparent 50%),
    radial-gradient(ellipse at 20% 80%, rgba(0,212,255,0.03), transparent 40%);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
input, textarea { font-family: inherit; }
ul, ol { list-style: none; }

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding-left: 40px;
  padding-right: 40px;
}
section { position: relative; }

/* ============ 按钮 ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  border: none;
  transition: all 0.3s ease;
  cursor: pointer;
}
.btn-primary {
  background: linear-gradient(135deg, #00D4FF, #0078FF);
  color: #fff;
  box-shadow: var(--shadow-btn);
}
.btn-primary:hover {
  box-shadow: var(--shadow-btn-hover);
  filter: brightness(1.1);
  transform: translateY(-2px);
}
.btn-secondary {
  background: transparent;
  border: 1px solid var(--accent);
  color: var(--accent);
}
.btn-secondary:hover {
  background: rgba(0, 212, 255, 0.1);
  box-shadow: 0 0 16px rgba(0,212,255,0.25);
  transform: translateY(-2px);
}
.btn:active { transform: scale(0.98); }
.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* ============ 导航 ============ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 26, 47, 0.88);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 40px;
  height: 72px;
  position: relative;
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 16px;
  flex-shrink: 0;
}
.logo-mark {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), #0078FF);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 16px rgba(0,212,255,0.35);
  flex-shrink: 0;
}
.logo-mark svg { width: 20px; height: 20px; }
.logo-text {
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: 0.02em;
  white-space: nowrap;
}
.nav-left, .nav-right {
  display: flex;
  align-items: center;
  gap: 6px;
}
.nav-link {
  position: relative;
  display: inline-block;
  padding: 8px 12px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-sub);
  transition: color 0.3s ease;
  border-radius: var(--radius-xs);
}
.nav-link:hover,
.nav-link.active {
  color: var(--accent);
}
.nav-link::after {
  content: '';
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 2px;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
  box-shadow: 0 0 8px rgba(0,212,255,0.6);
  opacity: 0;
  transform: scaleX(0);
  transition: all 0.3s ease;
}
.nav-link:hover::after,
.nav-link.active::after {
  opacity: 1;
  transform: scaleX(1);
}
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  padding: 10px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 1001;
}
.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text-main);
  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); }
.nav-panel {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  background: rgba(10, 26, 47, 0.98);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 20px 24px 28px;
  flex-direction: column;
  gap: 6px;
  z-index: 999;
}
.nav-panel a {
  display: block;
  padding: 14px 12px;
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-main);
  border-radius: var(--radius-sm);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transition: all 0.3s ease;
}
.nav-panel a:hover,
.nav-panel a.active {
  color: var(--accent);
  background: rgba(0,212,255,0.06);
  padding-left: 18px;
}

/* ============ Hero ============ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background:
    radial-gradient(ellipse at 30% 40%, rgba(0,212,255,0.12), transparent 50%),
    radial-gradient(ellipse at 70% 70%, rgba(124,252,0,0.06), transparent 40%),
    linear-gradient(180deg, rgba(4,16,31,0.6), rgba(4,16,31,0.92)),
    url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
  padding: 120px 20px 80px;
}
.hero-inner {
  max-width: 900px;
  margin: 0 auto;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  border: 1px solid rgba(124,252,0,0.4);
  border-radius: 40px;
  background: rgba(124,252,0,0.08);
  color: var(--accent-b);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  margin-bottom: 28px;
}
.hero-badge .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-b);
  box-shadow: 0 0 8px rgba(124,252,0,0.7);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}
.hero h1 {
  font-size: clamp(2.8rem, 5vw, 4.5rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: #FFFFFF;
  text-shadow: 0 4px 32px rgba(0,0,0,0.5);
  line-height: 1.2;
  margin-bottom: 20px;
}
.hero-sub {
  font-size: 1.25rem;
  line-height: 1.8;
  color: var(--text-main);
  max-width: 680px;
  margin: 0 auto 36px;
  opacity: 0.9;
}
.hero-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}
.hero-scroll {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  width: 24px;
  height: 40px;
  border: 2px solid rgba(255,255,255,0.3);
  border-radius: 14px;
  display: flex;
  justify-content: center;
  padding-top: 8px;
}
.hero-scroll::before {
  content: '';
  width: 4px;
  height: 8px;
  background: var(--accent);
  border-radius: 4px;
  animation: scrollDown 1.8s ease-in-out infinite;
}
@keyframes scrollDown {
  0% { transform: translateY(0); opacity: 1; }
  100% { transform: translateY(14px); opacity: 0; }
}

/* ============ 数据带 ============ */
.stats {
  padding: 60px 0;
  background: var(--bg-deep);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.stat-item {
  text-align: center;
  padding: 28px 16px;
  border-radius: var(--radius-md);
  background: var(--surface);
  border: 1px solid var(--border);
  transition: all 0.3s ease;
}
.stat-item:hover {
  background: var(--surface-hover);
  border-color: var(--accent);
  transform: translateY(-4px);
}
.stat-num {
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1.2;
  margin-bottom: 6px;
  font-family: 'Segoe UI', sans-serif;
}
.stat-label {
  font-size: 0.875rem;
  color: var(--text-sub);
}

/* ============ 板块通用 ============ */
.section {
  padding: var(--space-section) 0;
}
.section-head {
  text-align: center;
  margin-bottom: 48px;
}
.section-head .section-tag {
  display: inline-block;
  padding: 4px 16px;
  border-radius: 40px;
  background: rgba(0,212,255,0.08);
  border: 1px solid rgba(0,212,255,0.25);
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  margin-bottom: 16px;
}
.section-head h2 {
  font-size: clamp(2rem, 3.5vw, 3rem);
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--text-main);
  line-height: 1.3;
}
.section-head .section-desc {
  font-size: 1rem;
  color: var(--text-sub);
  max-width: 640px;
  margin: 12px auto 0;
}

/* ============ 玩法介绍 ============ */
.intro {
  overflow: hidden;
}
.intro-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.intro-block + .intro-block {
  margin-top: 80px;
}
.intro-media {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-card);
}
.intro-media img {
  width: 100%;
  height: 100%;
  min-height: 320px;
  object-fit: cover;
}
.intro-media::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 60%, rgba(4,16,31,0.7));
}
.intro-media .media-tag {
  position: absolute;
  left: 20px;
  bottom: 20px;
  z-index: 1;
  padding: 4px 14px;
  border-radius: var(--radius-xs);
  background: rgba(0,212,255,0.15);
  border: 1px solid rgba(0,212,255,0.4);
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.05em;
}
.intro-content h3 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 16px;
  line-height: 1.4;
}
.intro-content p {
  font-size: 1rem;
  line-height: 1.9;
  color: var(--text-body);
  margin-bottom: 20px;
}
.intro-content .intro-feature-list {
  margin-bottom: 24px;
}
.intro-content .intro-feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 8px 0;
  color: var(--text-body);
  font-size: 0.95rem;
}
.intro-content .intro-feature-list li::before {
  content: '✓';
  color: var(--accent-b);
  font-weight: 700;
  flex-shrink: 0;
  font-size: 1rem;
  line-height: 1.6;
}
.intro-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--accent);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.3s ease;
}
.intro-link:hover {
  gap: 14px;
  text-shadow: 0 0 12px rgba(0,212,255,0.5);
}

/* ============ 奖励预览 ============ */
.rewards {
  background: var(--bg-deep);
}
.rewards-scroll {
  display: flex;
  gap: 20px;
  overflow-x: auto;
  padding: 8px 4px 24px;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}
.rewards-scroll::-webkit-scrollbar {
  height: 6px;
}
.rewards-scroll::-webkit-scrollbar-track {
  background: rgba(255,255,255,0.05);
  border-radius: 4px;
}
.rewards-scroll::-webkit-scrollbar-thumb {
  background: linear-gradient(90deg, var(--accent), #0078FF);
  border-radius: 4px;
}
.reward-card {
  flex: 0 0 280px;
  scroll-snap-align: start;
  padding: 28px 24px;
  border-radius: var(--radius-md);
  background: var(--surface);
  border: 1px solid var(--border);
  transition: all 0.3s ease;
}
.reward-card:hover {
  background: var(--surface-hover);
  border-color: var(--accent);
  box-shadow: var(--shadow-hover);
  transform: translateY(-6px);
}
.reward-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
  font-size: 1.5rem;
}
.reward-icon.blue {
  background: rgba(0,212,255,0.12);
  border: 1px solid rgba(0,212,255,0.3);
  color: var(--accent);
}
.reward-icon.green {
  background: rgba(124,252,0,0.08);
  border: 1px solid rgba(124,252,0,0.3);
  color: var(--accent-b);
}
.reward-icon.purple {
  background: rgba(158,124,255,0.1);
  border: 1px solid rgba(158,124,255,0.3);
  color: #9E7CFF;
}
.reward-icon.orange {
  background: rgba(255,170,64,0.1);
  border: 1px solid rgba(255,170,64,0.3);
  color: #FFAA40;
}
.reward-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 10px;
}
.reward-card p {
  font-size: 0.9rem;
  color: var(--text-sub);
  line-height: 1.7;
}
.reward-tag {
  display: inline-block;
  margin-top: 14px;
  padding: 3px 12px;
  border-radius: var(--radius-xs);
  background: rgba(0,212,255,0.06);
  border: 1px solid rgba(0,212,255,0.2);
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 600;
}

/* ============ 参与路径 ============ */
.path-section {
  overflow: hidden;
}
.path-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  position: relative;
}
.path-grid::before {
  content: '';
  position: absolute;
  top: 32px;
  left: 8%;
  right: 8%;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), rgba(0,212,255,0.3), var(--accent));
  opacity: 0.4;
}
.path-step {
  text-align: center;
  position: relative;
  padding: 0 12px;
}
.path-step-num {
  width: 64px;
  height: 64px;
  margin: 0 auto 18px;
  border-radius: 50%;
  background: var(--primary);
  border: 2px solid var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent);
  box-shadow: 0 0 24px rgba(0,212,255,0.2);
  position: relative;
  z-index: 1;
}
.path-step-num::after {
  content: '';
  position: absolute;
  inset: -6px;
  border-radius: 50%;
  border: 1px dashed rgba(0,212,255,0.3);
  animation: spin 20s linear infinite;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}
.path-step h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
}
.path-step p {
  font-size: 0.9rem;
  color: var(--text-sub);
  line-height: 1.7;
  max-width: 220px;
  margin: 0 auto;
}
.path-status {
  display: inline-block;
  margin-top: 12px;
  padding: 2px 12px;
  border-radius: var(--radius-xs);
  background: rgba(124,252,0,0.06);
  border: 1px solid rgba(124,252,0,0.25);
  color: var(--accent-b);
  font-size: 0.75rem;
  font-weight: 600;
}

/* ============ 最新资讯 ============ */
.news {
  background: var(--bg-deep);
}
.news-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 900px;
  margin: 0 auto;
}
.news-card {
  display: flex;
  align-items: stretch;
  gap: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all 0.3s ease;
}
.news-card:hover {
  background: var(--surface-hover);
  border-color: var(--accent);
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
}
.news-thumb {
  width: 120px;
  flex-shrink: 0;
  overflow: hidden;
  position: relative;
}
.news-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.news-card:hover .news-thumb img {
  transform: scale(1.05);
}
.news-info {
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  flex: 1;
  min-width: 0;
}
.news-info h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.5;
  margin-bottom: 6px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: color 0.3s ease;
}
.news-card:hover .news-info h3 {
  color: var(--accent);
}
.news-info p {
  font-size: 0.875rem;
  color: var(--text-sub);
  line-height: 1.6;
  margin-bottom: 10px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.news-meta {
  display: flex;
  align-items: center;
  gap: 10px;
}
.news-cat {
  display: inline-block;
  padding: 2px 10px;
  border-radius: var(--radius-xs);
  background: rgba(0,212,255,0.08);
  border: 1px solid rgba(0,212,255,0.2);
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 600;
}
.news-date {
  font-size: 0.75rem;
  color: var(--text-sub);
}
.empty-tip {
  text-align: center;
  padding: 48px 24px;
  color: var(--text-sub);
  font-size: 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

/* ============ FAQ ============ */
.faq-wrap {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: rgba(255,255,255,0.03);
  overflow: hidden;
  transition: all 0.3s ease;
}
.faq-item:hover {
  border-color: rgba(0,212,255,0.3);
}
.faq-item[open] {
  background: rgba(255,255,255,0.05);
  border-color: var(--accent);
}
.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 20px;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-main);
  list-style: none;
  position: relative;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: '+';
  font-size: 1.4rem;
  color: var(--accent);
  font-weight: 300;
  transition: transform 0.3s ease;
  flex-shrink: 0;
}
.faq-item[open] summary::after {
  transform: rotate(45deg);
}
.faq-item .faq-answer {
  padding: 0 20px 18px;
  font-size: 0.925rem;
  line-height: 1.8;
  color: var(--text-sub);
}

/* ============ CTA ============ */
.cta-section {
  padding: 100px 0;
  text-align: center;
  background:
    radial-gradient(ellipse at center, rgba(0,212,255,0.12), transparent 60%),
    linear-gradient(180deg, rgba(4,16,31,0.7), rgba(4,16,31,0.94)),
    url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
  position: relative;
}
.cta-section h2 {
  font-size: clamp(2rem, 3.5vw, 2.8rem);
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
  letter-spacing: 0.02em;
}
.cta-section p {
  font-size: 1.05rem;
  color: var(--text-main);
  max-width: 560px;
  margin: 0 auto 32px;
  opacity: 0.85;
}
.cta-glow {
  display: inline-block;
  position: relative;
}
.cta-glow::before {
  content: '';
  position: absolute;
  inset: -8px;
  border-radius: 16px;
  background: rgba(0,212,255,0.3);
  filter: blur(20px);
  z-index: -1;
  animation: glowPulse 3s ease-in-out infinite;
}
@keyframes glowPulse {
  0%, 100% { opacity: 0.6; }
  50% { opacity: 1; }
}

/* ============ 页脚 ============ */
.site-footer {
  background: var(--bg-deep);
  border-top: 1px solid rgba(255,255,255,0.06);
  padding-top: 80px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 60px;
  padding-bottom: 50px;
}
.footer-brand .footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}
.footer-brand .footer-logo .logo-text {
  font-size: 1.2rem;
}
.footer-brand p {
  font-size: 0.9rem;
  color: var(--text-sub);
  line-height: 1.8;
  max-width: 320px;
}
.footer-col h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 16px;
}
.footer-col ul li {
  margin-bottom: 10px;
}
.footer-col ul li a {
  font-size: 0.9rem;
  color: var(--text-sub);
  transition: all 0.3s ease;
}
.footer-col ul li a:hover {
  color: var(--accent);
  padding-left: 4px;
}
.footer-contact p {
  font-size: 0.9rem;
  color: var(--text-sub);
  line-height: 1.8;
}
.footer-contact-email {
  color: var(--accent);
  word-break: break-all;
}
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 24px 0;
  text-align: center;
}
.footer-bottom p {
  font-size: 0.8rem;
  color: rgba(155,176,200,0.7);
}

/* ============ 响应式 ============ */
@media (max-width: 1024px) {
  .header-inner { gap: 12px; padding: 0 20px; }
  .nav-link { padding: 8px 8px; font-size: 0.85rem; }
  .logo-text { font-size: 1rem; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .intro-block { gap: 40px; }
  .path-grid { grid-template-columns: repeat(2, 1fr); gap: 40px; }
  .path-grid::before { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 40px; }
}
@media (max-width: 768px) {
  :root { --space-section: var(--space-mobile); }
  .container { padding-left: 20px; padding-right: 20px; }
  .nav-left, .nav-right { display: none; }
  .hamburger { display: flex; }
  .nav-panel.open { display: flex; }
  .header-inner { justify-content: space-between; height: 64px; }
  .site-logo { margin-left: 0; }
  .logo-mark { width: 30px; height: 30px; border-radius: 8px; }
  .logo-mark svg { width: 16px; height: 16px; }
  .logo-text { font-size: 0.95rem; white-space: normal; }
  .hero { padding: 100px 16px 60px; }
  .hero h1 { font-size: clamp(2rem, 7vw, 2.8rem); }
  .hero-sub { font-size: 1.05rem; }
  .hero-actions { flex-direction: column; align-items: center; }
  .hero-actions .btn { width: 100%; max-width: 320px; }
  .intro-block { grid-template-columns: 1fr; gap: 28px; }
  .intro-block + .intro-block { margin-top: 50px; }
  .intro-block.reverse .intro-media { order: -1; }
  .rewards-scroll { padding-bottom: 16px; }
  .reward-card { flex-basis: 220px; }
  .path-grid { grid-template-columns: 1fr; gap: 32px; }
  .news-card { flex-direction: column; }
  .news-thumb { width: 100%; height: 160px; }
  .news-thumb img { width: 100%; height: 100%; }
  .news-info { padding: 16px; }
  .news-info h3 { white-space: normal; overflow: visible; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .cta-section { padding: 70px 20px; }
}
@media (max-width: 520px) {
  .stats-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .stat-num { font-size: 1.8rem; }
  .reward-card { flex-basis: 200px; padding: 20px 16px; }
  .footer-col ul li a { font-size: 0.85rem; }
}

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --c-primary: #0A1A2F;
            --c-accent: #00D4FF;
            --c-lime: #7CFC00;
            --c-bg: #04101F;
            --c-surface: rgba(255, 255, 255, 0.06);
            --c-surface-hover: rgba(255, 255, 255, 0.12);
            --c-text: #E6F1FF;
            --c-text-secondary: #9BB0C8;
            --c-border: rgba(255, 255, 255, 0.14);
            --radius-lg: 20px;
            --radius-md: 16px;
            --radius-sm: 8px;
            --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.35);
            --shadow-btn: 0 0 20px rgba(0, 212, 255, 0.45);
            --transition: 0.3s ease;
            --container-max: 1280px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
            background: var(--c-bg);
            color: var(--c-text);
            line-height: 1.8;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }
        a {
            color: var(--c-accent);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: #fff;
        }
        img {
            max-width: 100%;
            display: block;
        }
        button {
            font-family: inherit;
            cursor: pointer;
            border: none;
            background: none;
        }
        ul {
            list-style: none;
        }

        /* ===== 容器 ===== */
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 40px;
        }

        /* ===== 按钮 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 28px;
            border-radius: var(--radius-sm);
            font-size: 1rem;
            font-weight: 700;
            letter-spacing: 0.05em;
            line-height: 1.4;
            transition: all var(--transition);
            outline: none;
        }
        .btn:focus-visible {
            box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.55);
        }
        .btn:active {
            transform: scale(0.98);
        }
        .btn-primary {
            background: linear-gradient(135deg, #00D4FF, #0078FF);
            color: #fff;
            box-shadow: var(--shadow-btn);
        }
        .btn-primary:hover {
            box-shadow: 0 0 30px rgba(0, 212, 255, 0.7);
            color: #fff;
            filter: brightness(1.08);
        }
        .btn-secondary {
            background: transparent;
            border: 1px solid var(--c-accent);
            color: var(--c-accent);
        }
        .btn-secondary:hover {
            background: rgba(0, 212, 255, 0.1);
            color: var(--c-accent);
        }
        .btn-cta {
            padding: 18px 48px;
            font-size: 1.125rem;
            border-radius: 12px;
        }

        /* ===== 标签 ===== */
        .badge {
            display: inline-block;
            padding: 4px 12px;
            border-radius: 4px;
            font-size: 0.875rem;
            background: rgba(124, 252, 0, 0.12);
            border: 1px solid rgba(124, 252, 0, 0.4);
            color: var(--c-lime);
            line-height: 1.5;
            white-space: nowrap;
        }
        .badge-accent {
            background: rgba(0, 212, 255, 0.1);
            border-color: rgba(0, 212, 255, 0.35);
            color: var(--c-accent);
        }

        /* ===== 排版 ===== */
        h1 {
            font-size: clamp(2.8rem, 5vw, 4.5rem);
            font-weight: 700;
            letter-spacing: 0.02em;
            color: #fff;
            text-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
            line-height: 1.2;
        }
        h2 {
            font-size: clamp(2rem, 3.5vw, 3rem);
            font-weight: 700;
            letter-spacing: 0.01em;
            color: var(--c-text);
            line-height: 1.3;
            margin-bottom: 20px;
        }
        h3 {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--c-accent);
            line-height: 1.4;
        }
        h4 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--c-text);
        }
        p {
            color: var(--c-text-secondary);
            font-size: 1rem;
            line-height: 1.8;
        }
        .section-title {
            text-align: center;
            margin-bottom: 40px;
        }
        .section-title .lead {
            max-width: 640px;
            margin: 0 auto;
            font-size: 1.05rem;
        }

        /* ===== Header ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(10, 26, 47, 0.88);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.07);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            position: relative;
            height: 76px;
        }
        .nav-left,
        .nav-right {
            display: flex;
            align-items: center;
            gap: 28px;
        }
        .nav-link {
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--c-text);
            padding: 8px 2px;
            position: relative;
            letter-spacing: 0.04em;
            transition: color var(--transition);
        }
        .nav-link::after {
            content: "";
            position: absolute;
            left: 0;
            bottom: 0;
            width: 100%;
            height: 2px;
            background: var(--c-accent);
            border-radius: 2px;
            box-shadow: 0 0 10px rgba(0, 212, 255, 0.6);
            transform: scaleX(0);
            transform-origin: center;
            transition: transform var(--transition);
        }
        .nav-link:hover {
            color: var(--c-accent);
        }
        .nav-link:hover::after {
            transform: scaleX(1);
        }
        .nav-link.active {
            color: var(--c-accent);
        }
        .nav-link.active::after {
            transform: scaleX(1);
        }
        .nav-logo {
            position: absolute;
            left: 50%;
            top: 50%;
            transform: translate(-50%, -50%);
            display: flex;
            align-items: center;
            gap: 10px;
            color: #fff;
            font-weight: 700;
            font-size: 1.2rem;
            letter-spacing: 0.03em;
            white-space: nowrap;
        }
        .nav-logo:hover {
            color: #fff;
        }
        .logo-mark {
            width: 36px;
            height: 36px;
            border-radius: 10px;
            background: linear-gradient(135deg, rgba(0, 212, 255, 0.25), rgba(0, 120, 255, 0.15));
            display: flex;
            align-items: center;
            justify-content: center;
            border: 1px solid rgba(0, 212, 255, 0.3);
        }
        .logo-mark svg {
            width: 22px;
            height: 22px;
        }
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            border-radius: 6px;
            z-index: 110;
        }
        .nav-toggle span {
            width: 22px;
            height: 2px;
            background: var(--c-text);
            border-radius: 2px;
            transition: all 0.3s ease;
        }
        .nav-toggle[aria-expanded="true"] span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .nav-toggle[aria-expanded="true"] span:nth-child(2) {
            opacity: 0;
        }
        .nav-toggle[aria-expanded="true"] span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

        /* ===== Mobile Menu ===== */
        .mobile-menu {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100vh;
            background: var(--c-primary);
            z-index: 105;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 24px;
            opacity: 0;
            visibility: hidden;
            transition: opacity 0.3s ease, visibility 0.3s ease;
        }
        .mobile-menu.is-open {
            opacity: 1;
            visibility: visible;
        }
        .mobile-menu a {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--c-text);
            letter-spacing: 0.02em;
            padding: 6px 12px;
        }
        .mobile-menu a:hover {
            color: var(--c-accent);
        }
        .mobile-menu a.active {
            color: var(--c-accent);
        }

        /* ===== Hero ===== */
        .page-hero {
            position: relative;
            min-height: 62vh;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            background: url('/assets/images/backpic/back-1.webp') center center / cover no-repeat;
            padding: 100px 20px 80px;
        }
        .page-hero::before {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(4, 16, 31, 0.55) 0%, rgba(4, 16, 31, 0.82) 55%, rgba(4, 16, 31, 0.96) 100%);
        }
        .page-hero .container {
            position: relative;
            z-index: 2;
            max-width: 900px;
            margin: 0 auto;
        }
        .page-hero .hero-badge {
            margin-bottom: 20px;
        }
        .page-hero p.hero-sub {
            font-size: 1.25rem;
            color: var(--c-text-secondary);
            max-width: 680px;
            margin: 20px auto 36px;
            line-height: 1.7;
        }
        .hero-actions {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }
        .hero-scroll {
            position: absolute;
            bottom: 28px;
            left: 50%;
            transform: translateX(-50%);
            z-index: 3;
            color: var(--c-text-secondary);
            font-size: 0.875rem;
            letter-spacing: 0.08em;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 4px;
        }
        .hero-scroll .arrow {
            width: 20px;
            height: 20px;
            border-right: 2px solid var(--c-accent);
            border-bottom: 2px solid var(--c-accent);
            transform: rotate(45deg);
            animation: heroBounce 1.8s infinite ease-in-out;
        }
        @keyframes heroBounce {
            0%,
            100% {
                transform: rotate(45deg) translateY(0);
            }
            50% {
                transform: rotate(45deg) translateY(6px);
            }
        }

        /* ===== Section 通用 ===== */
        .section {
            padding: 90px 0;
        }
        .section-alt {
            background: rgba(255, 255, 255, 0.02);
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        }

        /* ===== Overview 双栏 ===== */
        .overview-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }
        .overview-media {
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--c-border);
            box-shadow: var(--shadow-card);
            position: relative;
        }
        .overview-media img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            aspect-ratio: 16 / 10;
            transition: transform 0.5s ease;
        }
        .overview-media:hover img {
            transform: scale(1.03);
        }
        .overview-media::after {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, transparent 60%, rgba(4, 16, 31, 0.35));
            pointer-events: none;
        }
        .overview-content h2 {
            margin-bottom: 16px;
        }
        .overview-content p {
            margin-bottom: 20px;
        }
        .tag-list {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 12px;
        }

        /* ===== Timeline ===== */
        .timeline-marquee {
            position: relative;
            margin-top: 48px;
        }
        .timeline-bar {
            position: relative;
            max-width: 880px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .timeline-bar::before {
            content: "";
            position: absolute;
            left: 50%;
            top: 0;
            bottom: 0;
            width: 2px;
            background: linear-gradient(180deg, rgba(0, 212, 255, 0.5), rgba(124, 252, 0, 0.3));
            transform: translateX(-50%);
        }
        .timeline-node {
            display: flex;
            align-items: flex-start;
            gap: 40px;
            margin-bottom: 48px;
            position: relative;
        }
        .timeline-node:nth-child(odd) {
            flex-direction: row-reverse;
        }
        .timeline-node .node-content {
            width: calc(50% - 40px);
            background: var(--c-surface);
            border: 1px solid var(--c-border);
            border-radius: var(--radius-md);
            padding: 24px 28px;
            transition: all var(--transition);
        }
        .timeline-node .node-content:hover {
            background: var(--c-surface-hover);
            border-color: var(--c-accent);
            box-shadow: var(--shadow-card);
        }
        .timeline-node .node-marker {
            position: absolute;
            left: 50%;
            top: 28px;
            transform: translateX(-50%);
            width: 14px;
            height: 14px;
            border-radius: 50%;
            background: var(--c-accent);
            box-shadow: 0 0 0 4px rgba(0, 212, 255, 0.2), 0 0 14px rgba(0, 212, 255, 0.6);
        }
        .timeline-node .node-icon {
            width: 46px;
            height: 46px;
            border-radius: 12px;
            background: rgba(0, 212, 255, 0.12);
            border: 1px solid rgba(0, 212, 255, 0.3);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            margin-bottom: 12px;
        }
        .timeline-node h3 {
            margin-bottom: 8px;
        }
        .timeline-node p {
            font-size: 0.95rem;
        }
        .timeline-node .node-step {
            display: inline-block;
            margin-bottom: 12px;
            font-size: 0.875rem;
            color: var(--c-lime);
            font-weight: 700;
            letter-spacing: 0.08em;
            border: 1px solid rgba(124, 252, 0, 0.4);
            padding: 2px 10px;
            border-radius: 4px;
            background: rgba(124, 252, 0, 0.08);
        }

        /* ===== Stats ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .stat-card {
            background: var(--c-surface);
            border: 1px solid var(--c-border);
            border-radius: var(--radius-md);
            padding: 32px 20px;
            text-align: center;
            transition: all var(--transition);
        }
        .stat-card:hover {
            background: var(--c-surface-hover);
            border-color: var(--c-accent);
            transform: translateY(-4px);
            box-shadow: var(--shadow-card);
        }
        .stat-icon {
            font-size: 2rem;
            margin-bottom: 12px;
            color: var(--c-accent);
        }
        .stat-title {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--c-text);
            margin-bottom: 6px;
        }
        .stat-desc {
            font-size: 0.9rem;
            color: var(--c-text-secondary);
            line-height: 1.6;
        }
        .stat-highlight {
            color: var(--c-lime);
        }

        /* ===== Steps ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
            margin-top: 20px;
        }
        .step-card {
            background: var(--c-surface);
            border: 1px solid var(--c-border);
            border-radius: var(--radius-md);
            padding: 32px 28px;
            position: relative;
            transition: all var(--transition);
        }
        .step-card:hover {
            background: var(--c-surface-hover);
            border-color: var(--c-accent);
            box-shadow: var(--shadow-card);
            transform: translateY(-3px);
        }
        .step-num {
            font-size: 0.875rem;
            font-weight: 700;
            letter-spacing: 0.1em;
            color: var(--c-lime);
            background: rgba(124, 252, 0, 0.1);
            border: 1px solid rgba(124, 252, 0, 0.35);
            border-radius: 4px;
            padding: 2px 10px;
            display: inline-block;
            margin-bottom: 14px;
        }
        .step-card h3 {
            margin-bottom: 10px;
        }
        .step-card p {
            font-size: 0.95rem;
        }

        /* ===== FAQ ===== */
        .faq-wrap {
            max-width: 860px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 14px;
        }
        .faq-item {
            background: transparent;
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: 12px;
            transition: all var(--transition);
            overflow: hidden;
        }
        .faq-item[open] {
            background: rgba(255, 255, 255, 0.05);
            border-color: rgba(0, 212, 255, 0.3);
        }
        .faq-item summary {
            cursor: pointer;
            list-style: none;
            padding: 20px 52px 20px 20px;
            font-size: 1rem;
            font-weight: 700;
            color: var(--c-text);
            position: relative;
            transition: color var(--transition);
        }
        .faq-item summary::-webkit-details-marker {
            display: none;
        }
        .faq-item summary::after {
            content: "+";
            position: absolute;
            right: 20px;
            top: 50%;
            transform: translateY(-50%);
            font-size: 1.4rem;
            font-weight: 400;
            color: var(--c-accent);
            width: 28px;
            height: 28px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            border: 1px solid rgba(0, 212, 255, 0.4);
            transition: all 0.3s ease;
        }
        .faq-item[open] summary::after {
            content: "−";
            transform: translateY(-50%) rotate(180deg);
            background: rgba(0, 212, 255, 0.15);
        }
        .faq-item summary:hover {
            color: var(--c-accent);
        }
        .faq-answer {
            padding: 0 20px 20px;
            color: var(--c-text-secondary);
            font-size: 0.95rem;
            line-height: 1.8;
        }

        /* ===== CTA ===== */
        .cta-section {
            position: relative;
            background: url('/assets/images/backpic/back-2.webp') center center / cover no-repeat;
            padding: 110px 0;
            text-align: center;
            overflow: hidden;
        }
        .cta-section::before {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(4, 16, 31, 0.88), rgba(4, 16, 31, 0.94));
        }
        .cta-section .container {
            position: relative;
            z-index: 2;
        }
        .cta-section h2 {
            color: #fff;
            margin-bottom: 12px;
        }
        .cta-section .lead {
            max-width: 560px;
            margin: 0 auto 32px;
        }
        .cta-glow {
            display: inline-block;
            position: relative;
        }
        .cta-glow::before {
            content: "";
            position: absolute;
            inset: -8px;
            border-radius: 16px;
            background: radial-gradient(circle, rgba(0, 212, 255, 0.35), transparent 70%);
            z-index: -1;
            filter: blur(12px);
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #04101F;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: 80px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr;
            gap: 48px;
            padding-bottom: 48px;
        }
        .footer-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            color: #fff;
            font-weight: 700;
            font-size: 1.15rem;
            margin-bottom: 14px;
        }
        .footer-logo .logo-mark {
            width: 34px;
            height: 34px;
            border-radius: 10px;
        }
        .footer-brand p {
            font-size: 0.9rem;
            color: var(--c-text-secondary);
            max-width: 360px;
        }
        .footer-col h4 {
            font-size: 1rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
            letter-spacing: 0.04em;
        }
        .footer-col ul {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .footer-col ul a {
            color: var(--c-text-secondary);
            font-size: 0.9rem;
            transition: all var(--transition);
        }
        .footer-col ul a:hover {
            color: var(--c-accent);
            padding-left: 4px;
        }
        .footer-contact {
            font-size: 0.9rem;
            color: var(--c-text-secondary);
        }
        .footer-contact-email {
            color: var(--c-accent);
            font-weight: 600;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding: 28px 0;
            text-align: center;
            font-size: 0.875rem;
            color: var(--c-text-secondary);
        }

        /* ===== 背景装饰 ===== */
        .section-deco {
            position: relative;
        }
        .section-deco::before {
            content: "";
            position: absolute;
            top: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 480px;
            height: 480px;
            background: radial-gradient(circle, rgba(0, 212, 255, 0.06), transparent 70%);
            pointer-events: none;
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .container {
                padding: 0 24px;
            }
            .nav-left,
            .nav-right {
                display: none;
            }
            .nav-toggle {
                display: flex;
                margin-left: auto;
            }
            .nav-logo {
                position: static;
                transform: none;
                margin: 0 auto;
                order: -1;
            }
            .header-inner {
                display: flex;
                justify-content: flex-start;
                gap: 12px;
            }
            .mobile-menu {
                display: flex;
            }
            .steps-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 768px) {
            .section {
                padding: 56px 0;
            }
            .container {
                padding: 0 20px;
            }
            .header-inner {
                height: 64px;
            }
            .page-hero {
                min-height: 52vh;
                padding: 80px 16px 60px;
            }
            .page-hero p.hero-sub {
                font-size: 1.05rem;
                margin: 16px auto 28px;
            }
            .hero-actions {
                flex-direction: column;
                align-items: center;
            }
            .overview-grid {
                grid-template-columns: 1fr;
                gap: 36px;
            }
            .overview-media img {
                aspect-ratio: 16 / 12;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
            }
            .steps-grid {
                grid-template-columns: 1fr;
            }
            .timeline-bar {
                padding: 0 8px;
            }
            .timeline-bar::before {
                left: 8px;
                transform: none;
            }
            .timeline-node {
                flex-direction: column !important;
                gap: 12px;
                padding-left: 32px;
            }
            .timeline-node .node-content {
                width: 100%;
            }
            .timeline-node .node-marker {
                left: 8px;
                transform: translateX(-50%);
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .footer-brand p {
                max-width: 100%;
            }
        }
        @media (max-width: 520px) {
            h1 {
                font-size: 2.4rem;
            }
            h2 {
                font-size: 1.9rem;
            }
            .stats-grid {
                grid-template-columns: 1fr;
            }
            .btn-cta {
                padding: 15px 32px;
                font-size: 1rem;
                width: 100%;
                max-width: 340px;
            }
            .cta-section {
                padding: 70px 0;
            }
        }

/* roulang page: article */
:root {
    --primary: #0A1A2F;
    --accent: #00D4FF;
    --accent-green: #7CFC00;
    --bg: #04101F;
    --surface: rgba(255,255,255,0.06);
    --surface-hover: rgba(255,255,255,0.12);
    --text: #E6F1FF;
    --text-secondary: #9BB0C8;
    --text-body: #B8C9E0;
    --border: rgba(255,255,255,0.14);
    --radius-lg: 20px;
    --radius-md: 16px;
    --radius-sm: 8px;
    --radius-tag: 4px;
    --shadow-card: 0 8px 32px rgba(0,0,0,0.35);
    --shadow-card-hover: 0 12px 40px rgba(0,0,0,0.5);
    --shadow-btn: 0 0 20px rgba(0,212,255,0.45);
    --shadow-btn-hover: 0 0 30px rgba(0,212,255,0.7);
    --container: 1280px;
    --transition: 0.3s ease;
    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
}
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
html {
    scroll-behavior: smooth;
}
body {
    font-family: var(--font);
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.6;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    background-image:
        radial-gradient(circle at 15% 10%, rgba(0,212,255,0.06), transparent 60%),
        radial-gradient(circle at 85% 25%, rgba(124,252,0,0.04), transparent 50%),
        radial-gradient(circle at 50% 90%, rgba(0,212,255,0.04), transparent 40%);
    background-attachment: fixed;
    min-height: 100vh;
}
img {
    max-width: 100%;
    display: block;
}
a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition);
}
button {
    font-family: inherit;
    cursor: pointer;
}
input, textarea {
    font-family: inherit;
    font-size: 1rem;
}
.container {
    max-width: var(--container);
    margin: 0 auto;
    padding-left: 40px;
    padding-right: 40px;
    position: relative;
    z-index: 1;
}

/* ===== Header ===== */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(10, 26, 47, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255,255,255,0.08);
}
.header-inner {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 24px;
    min-height: 76px;
    position: relative;
}
.nav-left, .nav-right {
    display: flex;
    align-items: center;
    gap: 4px;
}
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 0;
    z-index: 2;
    flex-shrink: 0;
}
.logo-mark {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    border-radius: 10px;
    background: linear-gradient(135deg, rgba(0,212,255,0.2), rgba(0,120,255,0.15));
    border: 1px solid rgba(0,212,255,0.4);
    box-shadow: 0 0 14px rgba(0,212,255,0.25);
}
.logo-mark svg {
    width: 20px;
    height: 20px;
}
.logo-text {
    font-weight: 700;
    font-size: 1.1rem;
    letter-spacing: 0.02em;
    color: #ffffff;
    white-space: nowrap;
}
.nav-link {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    padding: 8px 14px;
    border-radius: 6px;
    position: relative;
    transition: color var(--transition), background var(--transition);
}
.nav-link:hover {
    color: var(--accent);
    background: rgba(0,212,255,0.08);
}
.nav-link.active {
    color: var(--accent);
}
.nav-link.active::after {
    content: '';
    position: absolute;
    left: 14px;
    right: 14px;
    bottom: 3px;
    height: 2px;
    background: var(--accent);
    box-shadow: 0 0 10px rgba(0,212,255,0.6);
    border-radius: 2px;
}
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    padding: 10px;
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 102;
}
.nav-toggle-line {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: transform 0.3s ease, opacity 0.3s ease, background 0.3s ease;
}
.nav-toggle:hover .nav-toggle-line {
    background: var(--accent);
}
.header-inner.menu-open .nav-toggle-line:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
    background: var(--accent);
}
.header-inner.menu-open .nav-toggle-line:nth-child(2) {
    opacity: 0;
}
.header-inner.menu-open .nav-toggle-line:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
    background: var(--accent);
}
.mobile-menu {
    display: none;
}
@media (max-width: 1024px) {
    .nav-left .nav-link, .nav-right .nav-link {
        font-size: 0.875rem;
        padding: 8px 10px;
    }
    .logo-text {
        font-size: 1rem;
    }
}
@media (max-width: 860px) {
    .nav-left, .nav-right {
        display: none;
    }
    .nav-toggle {
        display: flex;
    }
    .header-inner {
        justify-content: flex-start;
        padding-left: 20px;
        padding-right: 20px;
    }
    .logo {
        margin-right: auto;
    }
    .mobile-menu {
        display: flex;
        flex-direction: column;
        position: fixed;
        top: 76px;
        left: 0;
        right: 0;
        background: var(--primary);
        padding: 24px 20px 32px;
        border-bottom: 1px solid rgba(255,255,255,0.08);
        box-shadow: 0 20px 40px rgba(0,0,0,0.5);
        transform: translateY(-120%);
        transition: transform 0.35s ease;
        z-index: 99;
    }
    .mobile-menu.menu-open {
        transform: translateY(0);
    }
    .mobile-menu a {
        color: var(--text);
        font-size: 1.25rem;
        font-weight: 600;
        padding: 14px 0;
        border-bottom: 1px solid rgba(255,255,255,0.06);
        transition: color 0.3s ease;
    }
    .mobile-menu a:hover, .mobile-menu a.active {
        color: var(--accent);
    }
}

/* ===== Article Hero ===== */
.article-hero {
    position: relative;
    padding: 140px 0 80px;
    background-image: url('/assets/images/backpic/back-2.webp');
    background-size: cover;
    background-position: center;
    z-index: 1;
    overflow: hidden;
}
.article-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(4,16,31,0.85), rgba(10,26,47,0.78));
    z-index: 1;
}
.article-hero::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 25% 20%, rgba(0,212,255,0.1), transparent 50%),
                radial-gradient(circle at 80% 70%, rgba(124,252,0,0.04), transparent 35%);
    z-index: 2;
}
.article-hero .container {
    position: relative;
    z-index: 3;
    max-width: 900px;
}
.breadcrumb {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 24px;
}
.breadcrumb a {
    color: var(--text-secondary);
    transition: color 0.3s ease;
}
.breadcrumb a:hover {
    color: var(--accent);
}
.breadcrumb-sep {
    opacity: 0.5;
}
.breadcrumb-current {
    color: var(--accent);
    font-weight: 600;
    max-width: 300px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.article-hero-title {
    font-size: clamp(2rem, 3.5vw, 3rem);
    font-weight: 700;
    color: #ffffff;
    letter-spacing: 0.02em;
    line-height: 1.3;
    text-shadow: 0 2px 12px rgba(0,0,0,0.4);
    margin-bottom: 20px;
}
.article-hero-desc {
    font-size: 1rem;
    color: var(--text-body);
    line-height: 1.7;
    max-width: 720px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 20px;
}
.article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    align-items: center;
}
.meta-item {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.875rem;
    color: var(--text-secondary);
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.12);
    padding: 6px 14px;
    border-radius: 999px;
}
.meta-item .meta-icon {
    width: 14px;
    height: 14px;
    flex-shrink: 0;
}
.meta-category-tag {
    background: rgba(0,212,255,0.12);
    border-color: rgba(0,212,255,0.3);
    color: var(--accent);
    font-weight: 600;
}

/* ===== Article Main ===== */
.article-section {
    padding: 80px 0 60px;
    position: relative;
    z-index: 1;
}
.article-container {
    max-width: 820px;
    margin: 0 auto;
}
.article-content {
    font-size: 1rem;
    line-height: 1.85;
    color: var(--text-body);
}
.article-content p {
    margin-bottom: 1.8em;
}
.article-content h2 {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text);
    margin: 2em 0 0.8em;
    line-height: 1.3;
}
.article-content h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--accent);
    margin: 1.8em 0 0.6em;
}
.article-content h4 {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text);
    margin: 1.6em 0 0.5em;
}
.article-content a {
    color: var(--accent);
    text-decoration: underline;
    text-underline-offset: 3px;
}
.article-content a:hover {
    color: #ffffff;
}
.article-content blockquote {
    border-left: 4px solid var(--accent);
    padding: 16px 24px;
    background: rgba(255,255,255,0.04);
    border-radius: 0 12px 12px 0;
    margin: 1.6em 0;
    color: var(--text-secondary);
    font-style: normal;
}
.article-content blockquote p {
    margin-bottom: 0.6em;
}
.article-content blockquote p:last-child {
    margin-bottom: 0;
}
.article-content img {
    max-width: 100%;
    border-radius: 12px;
    margin: 28px 0;
    box-shadow: var(--shadow-card);
}
.article-content ul, .article-content ol {
    margin: 1.2em 0;
    padding-left: 1.5em;
}
.article-content ul li, .article-content ol li {
    margin-bottom: 0.6em;
}
.article-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.6em 0;
    font-size: 0.9375rem;
}
.article-content th, .article-content td {
    border: 1px solid rgba(255,255,255,0.12);
    padding: 10px 14px;
    text-align: left;
}
.article-content th {
    background: rgba(0,212,255,0.08);
    color: var(--text);
    font-weight: 600;
}
.article-content code {
    background: rgba(255,255,255,0.08);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9em;
    color: var(--accent);
}
.article-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-top: 48px;
    padding-top: 32px;
    border-top: 1px solid rgba(255,255,255,0.1);
}
.article-empty {
    text-align: center;
    padding: 100px 20px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
}
.article-empty p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 1rem;
    font-weight: 700;
    padding: 12px 28px;
    border-radius: var(--radius-sm);
    transition: transform 0.3s ease, box-shadow 0.3s ease, background 0.3s ease, color 0.3s ease, border-color 0.3s ease;
    letter-spacing: 0.04em;
    cursor: pointer;
    border: none;
    text-decoration: none;
}
.btn-primary {
    background: linear-gradient(135deg, #00D4FF, #0078FF);
    color: #ffffff;
    box-shadow: var(--shadow-btn);
}
.btn-primary:hover {
    box-shadow: var(--shadow-btn-hover);
    transform: translateY(-2px);
    color: #ffffff;
}
.btn-primary:active {
    transform: scale(0.98);
}
.btn-ghost {
    background: transparent;
    border: 1px solid var(--accent);
    color: var(--accent);
}
.btn-ghost:hover {
    background: rgba(0,212,255,0.1);
    color: #ffffff;
    border-color: #ffffff;
    transform: translateY(-2px);
}
.btn-ghost:active {
    transform: scale(0.98);
}
.btn-lg {
    padding: 16px 40px;
    font-size: 1.125rem;
    border-radius: 10px;
}
.btn:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
}

/* ===== Related Section ===== */
.related-section {
    padding: 60px 0 80px;
    position: relative;
    z-index: 1;
}
.related-section .container {
    max-width: 960px;
}
.section-heading {
    text-align: center;
    margin-bottom: 40px;
}
.section-heading h2 {
    font-size: clamp(1.8rem, 3vw, 2.4rem);
    font-weight: 700;
    color: var(--text);
    letter-spacing: 0.01em;
}
.section-heading .heading-line {
    width: 48px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), transparent);
    border-radius: 2px;
    margin: 14px auto 0;
}
.related-list {
    display: flex;
    flex-direction: column;
    gap: 14px;
}
.related-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 18px 24px;
    transition: background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease, transform 0.3s ease;
}
.related-item:hover {
    background: var(--surface-hover);
    border-color: var(--accent);
    box-shadow: var(--shadow-card-hover);
    transform: translateY(-2px);
}
.related-item-left {
    display: flex;
    align-items: center;
    gap: 14px;
    min-width: 0;
}
.related-item-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: linear-gradient(135deg, rgba(0,212,255,0.15), rgba(0,120,255,0.08));
    border: 1px solid rgba(0,212,255,0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}
.related-item-icon svg {
    width: 18px;
    height: 18px;
}
.related-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.related-item:hover .related-title {
    color: var(--accent);
}
.related-date {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    flex-shrink: 0;
    background: rgba(255,255,255,0.05);
    padding: 4px 10px;
    border-radius: 999px;
    border: 1px solid rgba(255,255,255,0.1);
}

/* ===== CTA Section ===== */
.cta-section {
    position: relative;
    padding: 80px 0;
    background: linear-gradient(135deg, rgba(0,212,255,0.06), rgba(10,26,47,0.4));
    border-top: 1px solid rgba(255,255,255,0.06);
    text-align: center;
    z-index: 1;
}
.cta-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 50% 50%, rgba(0,212,255,0.12), transparent 60%);
    z-index: 1;
}
.cta-section .container {
    position: relative;
    z-index: 2;
}
.cta-section h2 {
    font-size: clamp(1.8rem, 3vw, 2.6rem);
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 16px;
    letter-spacing: 0.02em;
}
.cta-section p {
    color: var(--text-secondary);
    max-width: 560px;
    margin: 0 auto 32px;
    font-size: 1rem;
    line-height: 1.7;
}
.cta-buttons {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
}

/* ===== Footer ===== */
.site-footer {
    background: #04101F;
    border-top: 1px solid rgba(255,255,255,0.06);
    padding: 80px 0 0;
    position: relative;
    z-index: 1;
}
.footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr;
    gap: 48px;
    padding-bottom: 48px;
}
.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
}
.footer-logo .logo-mark {
    width: 34px;
    height: 34px;
}
.footer-logo .logo-text {
    font-size: 1.05rem;
    color: #ffffff;
}
.footer-brand p {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.7;
    max-width: 340px;
}
.footer-col h4 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 20px;
    letter-spacing: 0.03em;
}
.footer-col ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.footer-col ul a {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    transition: color 0.3s ease, padding-left 0.3s ease;
}
.footer-col ul a:hover {
    color: var(--accent);
    padding-left: 6px;
}
.footer-contact p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.6;
}
.footer-contact-email {
    color: var(--accent);
    font-weight: 600;
}
.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.06);
    padding: 24px 0;
    text-align: center;
}
.footer-bottom p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* ===== Media Queries ===== */
@media (max-width: 1024px) {
    .container {
        padding-left: 28px;
        padding-right: 28px;
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 36px;
    }
    .article-hero {
        padding: 110px 0 60px;
    }
}
@media (max-width: 768px) {
    .container {
        padding-left: 20px;
        padding-right: 20px;
    }
    .article-hero {
        padding: 90px 0 48px;
    }
    .article-hero-title {
        font-size: 1.8rem;
    }
    .article-hero-desc {
        font-size: 0.9375rem;
    }
    .article-section {
        padding: 48px 0 40px;
    }
    .related-section {
        padding: 40px 0 56px;
    }
    .cta-section {
        padding: 56px 0;
    }
    .cta-buttons .btn {
        width: 100%;
        max-width: 320px;
    }
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    .site-footer {
        padding: 56px 0 0;
    }
    .article-actions {
        flex-direction: column;
        gap: 12px;
    }
    .article-actions .btn {
        width: 100%;
    }
    .related-item {
        padding: 14px 18px;
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    .related-date {
        align-self: flex-end;
    }
    .breadcrumb-current {
        max-width: 180px;
    }
}
@media (max-width: 520px) {
    .logo-text {
        font-size: 0.9375rem;
    }
    .logo-mark {
        width: 30px;
        height: 30px;
    }
    .article-hero-title {
        font-size: 1.5rem;
    }
    .article-meta {
        gap: 10px;
    }
    .meta-item {
        font-size: 0.8125rem;
        padding: 4px 10px;
    }
    .article-content {
        font-size: 0.9375rem;
    }
    .article-content h2 {
        font-size: 1.4rem;
    }
    .article-content h3 {
        font-size: 1.1rem;
    }
    .related-title {
        font-size: 0.9375rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
    html {
        scroll-behavior: auto;
    }
}

/* roulang page: category3 */
/* ========== Design Variables ========== */
:root {
  --primary: #0A1A2F;
  --accent: #00D4FF;
  --highlight: #7CFC00;
  --bg-dark: #04101F;
  --surface: rgba(255, 255, 255, 0.06);
  --text-main: #E6F1FF;
  --text-muted: #9BB0C8;
  --border: rgba(255, 255, 255, 0.14);
  --radius-lg: 20px;
  --radius-md: 16px;
  --radius-sm: 8px;
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.35);
  --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.5);
  --transition: 0.3s ease;
  --container: 1280px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
}

/* ========== Reset / Base ========== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.8;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
h1, h2, h3, h4 { line-height: 1.3; font-weight: 700; }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 40px;
}

/* ========== Header / Nav ========== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 26, 47, 0.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
.main-nav {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  height: 72px;
  gap: 24px;
}
.nav-left {
  display: flex;
  align-items: center;
  gap: 32px;
  justify-content: flex-start;
}
.nav-right {
  display: flex;
  align-items: center;
  gap: 32px;
  justify-content: flex-end;
}
.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  justify-self: center;
  white-space: nowrap;
}
.logo-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  background: linear-gradient(135deg, var(--accent), #0078FF);
  border-radius: 10px;
  box-shadow: 0 0 18px rgba(0, 212, 255, 0.35);
}
.logo-mark svg { width: 20px; height: 20px; }
.logo-text {
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.02em;
}
.nav-link {
  position: relative;
  font-size: 0.9375rem;
  color: var(--text-muted);
  font-weight: 500;
  padding: 6px 2px;
  transition: color 0.3s ease;
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.3s ease;
  box-shadow: 0 0 8px rgba(0, 212, 255, 0.6);
}
.nav-link:hover, .nav-link.active {
  color: var(--accent);
}
.nav-link:hover::after, .nav-link.active::after {
  transform: scaleX(1);
}
.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  border-radius: var(--radius-sm);
  transition: background 0.3s ease;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-main);
  border-radius: 2px;
  transition: all 0.3s ease;
}
.nav-toggle:hover { background: rgba(255, 255, 255, 0.06); }
.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: 72px;
  left: 0;
  right: 0;
  background: var(--primary);
  border-bottom: 1px solid var(--border);
  padding: 16px 24px 24px;
  flex-direction: column;
  gap: 4px;
  z-index: 999;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.5);
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
  display: block;
  padding: 14px 12px;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  transition: all 0.3s ease;
}
.mobile-menu a:hover, .mobile-menu a.active {
  color: var(--accent);
  background: rgba(0, 212, 255, 0.08);
}

/* ========== Hero ========== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 140px 0 80px;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background: url('/assets/images/backpic/back-2.webp') center center / cover no-repeat;
  z-index: 0;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(4, 16, 31, 0.55) 0%, rgba(4, 16, 31, 0.85) 70%, rgba(4, 16, 31, 0.95) 100%);
  z-index: 1;
}
.hero .container {
  position: relative;
  z-index: 2;
  max-width: 900px;
}
.breadcrumb {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}
.breadcrumb a { color: var(--text-muted); transition: color 0.3s ease; }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb span:last-child { color: var(--accent); }
.hero-tag {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(124, 252, 0, 0.12);
  border: 1px solid rgba(124, 252, 0, 0.4);
  color: var(--highlight);
  border-radius: 4px;
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  margin-bottom: 24px;
  text-transform: uppercase;
}
.hero h1 {
  font-size: clamp(2.8rem, 5vw, 4.5rem);
  font-weight: 700;
  color: #FFFFFF;
  letter-spacing: 0.02em;
  text-shadow: 0 4px 24px rgba(0, 0, 0, 0.45);
  margin-bottom: 24px;
}
.hero-sub {
  font-size: 1.25rem;
  line-height: 1.7;
  color: var(--text-muted);
  max-width: 680px;
  margin: 0 auto 40px;
}
.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ========== Buttons ========== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  background: linear-gradient(135deg, #00D4FF, #0078FF);
  color: #fff;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  border-radius: 8px;
  border: none;
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.45);
  transition: all 0.3s ease;
}
.btn-primary:hover {
  box-shadow: 0 0 30px rgba(0, 212, 255, 0.7);
  filter: brightness(1.08);
  transform: translateY(-1px);
}
.btn-primary:active { transform: scale(0.98); }
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  background: transparent;
  border: 1px solid var(--accent);
  color: var(--accent);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  border-radius: 8px;
  transition: all 0.3s ease;
}
.btn-secondary:hover {
  background: rgba(0, 212, 255, 0.1);
  box-shadow: 0 0 16px rgba(0, 212, 255, 0.2);
}
.btn-secondary:active { transform: scale(0.98); }

/* ========== Section Common ========== */
.section {
  padding: 100px 0;
}
.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 56px;
}
.section-tag {
  display: inline-block;
  padding: 4px 14px;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--accent);
  background: rgba(0, 212, 255, 0.08);
  border: 1px solid rgba(0, 212, 255, 0.25);
  border-radius: 4px;
  margin-bottom: 16px;
}
.section-head h2 {
  font-size: clamp(2rem, 3.5vw, 3rem);
  color: var(--text-main);
  margin-bottom: 16px;
  letter-spacing: 0.01em;
}
.section-head p {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.8;
}

/* ========== Stats ========== */
.stats {
  background: var(--primary);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 64px 0;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.stat-item {
  text-align: center;
  padding: 36px 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: all 0.3s ease;
}
.stat-item:hover {
  border-color: var(--accent);
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-3px);
}
.stat-number {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1.2;
  text-shadow: 0 0 20px rgba(0, 212, 255, 0.2);
}
.stat-label {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-top: 8px;
}

/* ========== Rewards Cards ========== */
.rewards {
  background: var(--bg-dark);
}
.rewards-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}
.reward-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 36px 32px;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}
.reward-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--highlight));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}
.reward-card:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--accent);
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
}
.reward-card:hover::before {
  transform: scaleX(1);
}
.reward-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 212, 255, 0.1);
  border-radius: 14px;
  margin-bottom: 20px;
  color: var(--accent);
  transition: all 0.3s ease;
}
.reward-card:hover .reward-icon {
  background: rgba(0, 212, 255, 0.2);
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.2);
}
.reward-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 12px;
}
.reward-card p {
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.7;
}
.reward-badge {
  display: inline-block;
  margin-top: 16px;
  padding: 4px 10px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--highlight);
  background: rgba(124, 252, 0, 0.1);
  border: 1px solid rgba(124, 252, 0, 0.3);
  border-radius: 4px;
}

/* ========== Process Timeline ========== */
.process {
  background: var(--primary);
}
.process-timeline {
  position: relative;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 48px 0 0;
}
.process-timeline::before {
  content: '';
  position: absolute;
  top: 68px;
  left: 12%;
  right: 12%;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--highlight));
  opacity: 0.35;
  border-radius: 2px;
}
.process-item {
  position: relative;
  flex: 1;
  text-align: center;
  padding: 0 10px;
}
.process-dot {
  width: 58px;
  height: 58px;
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-dark);
  border: 2px solid var(--accent);
  border-radius: 50%;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--accent);
  position: relative;
  z-index: 1;
  transition: all 0.3s ease;
  box-shadow: 0 0 0 4px rgba(0, 212, 255, 0.08);
}
.process-item:hover .process-dot {
  background: var(--accent);
  color: var(--bg-dark);
  box-shadow: 0 0 24px rgba(0, 212, 255, 0.4);
}
.process-item h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 8px;
}
.process-item p {
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ========== Rules Section ========== */
.rules {
  background: var(--bg-dark);
}
.rules-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.rules-image {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}
.rules-image img {
  width: 100%;
  height: 420px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  transition: transform 0.4s ease;
}
.rules-image:hover img {
  transform: scale(1.03);
}
.rules-image::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(4, 16, 31, 0.1), rgba(4, 16, 31, 0.3));
  border-radius: var(--radius-lg);
}
.rules-content h2 {
  font-size: clamp(1.8rem, 2.8vw, 2.5rem);
  color: var(--text-main);
  margin-bottom: 16px;
}
.rules-content > p {
  color: var(--text-muted);
  font-size: 1rem;
  margin-bottom: 28px;
}
.rules-list li {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
  transition: background 0.3s ease;
}
.rules-list li:hover {
  background: rgba(255, 255, 255, 0.03);
}
.rules-list li:last-child {
  border-bottom: none;
}
.rules-index {
  width: 30px;
  height: 30px;
  min-width: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(124, 252, 0, 0.1);
  border: 1px solid rgba(124, 252, 0, 0.3);
  color: var(--highlight);
  border-radius: 50%;
  font-size: 0.8125rem;
  font-weight: 700;
  margin-top: 4px;
}
.rules-list h4 {
  font-size: 1rem;
  color: var(--text-main);
  margin-bottom: 4px;
}
.rules-list p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ========== FAQ ========== */
.faq {
  background: var(--primary);
}
.faq-list {
  max-width: 820px;
  margin: 0 auto;
}
.faq-item {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: 14px;
  overflow: hidden;
  transition: all 0.3s ease;
}
.faq-item:hover {
  border-color: rgba(0, 212, 255, 0.3);
}
.faq-item.open {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--accent);
}
.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  padding: 20px 22px;
  text-align: left;
  background: none;
  border: none;
  cursor: pointer;
  gap: 16px;
}
.faq-question h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-main);
  transition: color 0.3s ease;
  line-height: 1.5;
}
.faq-question:hover h4 {
  color: var(--accent);
}
.faq-icon {
  width: 26px;
  height: 26px;
  min-width: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(0, 212, 255, 0.12);
  color: var(--accent);
  font-size: 1.25rem;
  font-weight: 400;
  line-height: 1;
  transition: transform 0.3s ease, background 0.3s ease;
}
.faq-item.open .faq-icon {
  transform: rotate(45deg);
  background: rgba(0, 212, 255, 0.25);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}
.faq-item.open .faq-answer {
  max-height: 400px;
}
.faq-answer p {
  padding: 0 22px 20px;
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.8;
}

/* ========== CTA ========== */
.cta {
  background: var(--bg-dark);
  padding: 100px 0;
}
.cta-box {
  position: relative;
  text-align: center;
  padding: 72px 48px;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.08), rgba(124, 252, 0, 0.04));
  border: 1px solid rgba(0, 212, 255, 0.3);
  border-radius: var(--radius-lg);
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.4);
  overflow: hidden;
}
.cta-box::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -20%;
  width: 60%;
  height: 200%;
  background: radial-gradient(circle, rgba(0, 212, 255, 0.08), transparent 70%);
  pointer-events: none;
}
.cta-box h2 {
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  color: var(--text-main);
  margin-bottom: 16px;
  position: relative;
}
.cta-box p {
  color: var(--text-muted);
  font-size: 1rem;
  margin-bottom: 36px;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
  position: relative;
}
.cta-box .btn-primary {
  position: relative;
  font-size: 1.1rem;
  padding: 16px 40px;
}

/* ========== Footer ========== */
.site-footer {
  background: #04101F;
  border-top: 1px solid var(--border);
  padding: 80px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
}
.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}
.footer-brand .footer-logo .logo-text {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-main);
}
.footer-brand p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 360px;
}
.footer-col h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 20px;
}
.footer-col ul li {
  margin-bottom: 10px;
}
.footer-col ul li a {
  font-size: 0.875rem;
  color: var(--text-muted);
  transition: color 0.3s ease, padding-left 0.3s ease;
}
.footer-col ul li a:hover {
  color: var(--accent);
  padding-left: 4px;
}
.footer-contact {
  font-size: 0.875rem;
  color: var(--text-muted);
}
.footer-contact-email {
  color: var(--accent);
}
.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 20px 0;
  text-align: center;
}
.footer-bottom p {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

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

@media (max-width: 768px) {
  .container {
    padding: 0 20px;
  }
  .main-nav {
    grid-template-columns: 1fr auto 1fr;
    height: 64px;
  }
  .nav-left,
  .nav-right {
    display: none;
  }
  .logo {
    grid-column: 2;
  }
  .nav-toggle {
    display: flex;
    grid-column: 3;
    justify-self: end;
  }
  .section {
    padding: 64px 0;
  }
  .section-head {
    margin-bottom: 40px;
  }
  .hero {
    min-height: auto;
    padding: 120px 0 60px;
  }
  .hero h1 {
    font-size: clamp(2rem, 8vw, 2.6rem);
  }
  .hero-sub {
    font-size: 1rem;
  }
  .hero-actions {
    flex-direction: column;
    align-items: center;
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
  .stat-number {
    font-size: 1.8rem;
  }
  .rewards-grid {
    grid-template-columns: 1fr;
  }
  .process-timeline {
    flex-direction: column;
    align-items: stretch;
    gap: 32px;
    padding-top: 16px;
  }
  .process-timeline::before {
    display: none;
  }
  .process-item {
    display: flex;
    align-items: center;
    gap: 20px;
    text-align: left;
    padding: 0;
  }
  .process-dot {
    margin: 0;
    min-width: 48px;
    width: 48px;
    height: 48px;
    font-size: 1rem;
  }
  .process-item h3 {
    margin-bottom: 2px;
  }
  .rules-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .rules-image img {
    height: 260px;
  }
  .cta-box {
    padding: 48px 24px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .footer-brand {
    grid-column: 1;
  }
}

@media (max-width: 520px) {
  .stats-grid {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }
  .stat-item {
    padding: 24px 12px;
  }
  .stat-number {
    font-size: 1.5rem;
  }
  .reward-card {
    padding: 24px 20px;
  }
  .faq-question h4 {
    font-size: 0.9375rem;
  }
  .cta-box h2 {
    font-size: 1.5rem;
  }
  .btn-primary,
  .btn-secondary {
    width: 100%;
    max-width: 320px;
  }
}

/* roulang page: category2 */
:root {
  --primary: #0A1A2F;
  --accent: #00D4FF;
  --accent-green: #7CFC00;
  --bg-deep: #04101F;
  --surface: rgba(255,255,255,0.06);
  --surface-hover: rgba(255,255,255,0.12);
  --text-main: #E6F1FF;
  --text-sub: #9BB0C8;
  --text-light: #B8C9E0;
  --border: rgba(255,255,255,0.14);
  --radius-lg: 20px;
  --radius-md: 16px;
  --radius-sm: 8px;
  --shadow-card: 0 8px 32px rgba(0,0,0,0.35);
  --shadow-hover: 0 12px 40px rgba(0,0,0,0.5);
  --glow: 0 0 20px rgba(0,212,255,0.45);
  --glow-hover: 0 0 30px rgba(0,212,255,0.7);
  --container-w: 1280px;
  --section-pad: 80px;
  --transition: 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
  background: var(--primary);
  color: var(--text-main);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(600px 400px at 15% 10%, rgba(0,212,255,0.05), transparent 60%),
    radial-gradient(800px 500px at 85% 30%, rgba(124,252,0,0.03), transparent 60%);
  pointer-events: none;
  z-index: 0;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: #66E0FF;
}

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

button, input {
  font-family: inherit;
}

ul {
  list-style: none;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.container {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 40px;
  position: relative;
  z-index: 1;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  border: none;
  transition: all var(--transition);
  cursor: pointer;
}

.btn-primary {
  background: linear-gradient(135deg, #00D4FF, #0078FF);
  color: #fff;
  box-shadow: var(--glow);
}

.btn-primary:hover {
  color: #fff;
  box-shadow: var(--glow-hover);
  transform: translateY(-2px);
}

.btn-secondary {
  background: transparent;
  border: 1px solid var(--accent);
  color: var(--accent);
}

.btn-secondary:hover {
  background: rgba(0,212,255,0.1);
  color: #66E0FF;
  transform: translateY(-2px);
}

.btn:active {
  transform: scale(0.98);
}

.btn-large {
  padding: 16px 44px;
  font-size: 1.1rem;
  border-radius: 10px;
}

/* ===== Header / Nav ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(10,26,47,0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.nav-wrap {
  position: relative;
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 40px;
  height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-left {
  display: flex;
  align-items: center;
  gap: 34px;
  flex: 1;
}

.nav-right {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 34px;
  flex: 1;
}

.nav-link {
  position: relative;
  color: var(--text-light);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  padding: 8px 2px;
  white-space: nowrap;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
  box-shadow: 0 0 8px var(--accent);
  transition: width var(--transition);
}

.nav-link:hover {
  color: var(--accent);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.nav-link.active {
  color: var(--accent);
}

.site-logo {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.site-logo:hover {
  color: #fff;
}

.logo-mark {
  display: inline-flex;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #00D4FF, #0078FF);
  border-radius: 10px;
  box-shadow: 0 0 14px rgba(0,212,255,0.4);
  flex-shrink: 0;
}

.logo-mark svg {
  width: 20px;
  height: 20px;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: 8px;
  z-index: 102;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-main);
  border-radius: 2px;
  transition: all var(--transition);
}

.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 {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--primary);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 24px;
  z-index: 101;
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition), visibility var(--transition);
}

.mobile-menu.open {
  visibility: visible;
  opacity: 1;
  pointer-events: auto;
}

.mobile-link {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-main);
  padding: 8px 16px;
}

.mobile-link:hover,
.mobile-link.active {
  color: var(--accent);
}

/* ===== Hero ===== */
.category-hero {
  position: relative;
  min-height: 540px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 150px 20px 100px;
  background: linear-gradient(135deg, rgba(4,16,31,0.62), rgba(4,16,31,0.92)), url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
  overflow: hidden;
}

.category-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(600px 300px at 50% 100%, rgba(0,212,255,0.12), transparent 70%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 2;
  max-width: 860px;
  margin: 0 auto;
}

.hero-breadcrumb {
  color: #6E849C;
  font-size: 0.85rem;
  margin-bottom: 18px;
  letter-spacing: 0.05em;
}

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

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

.hero-breadcrumb .sep {
  color: #4A5F78;
  margin: 0 10px;
}

.hero-breadcrumb .current {
  color: var(--accent);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border: 1px solid rgba(0,212,255,0.4);
  border-radius: 40px;
  background: rgba(0,212,255,0.08);
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(2.8rem, 5vw, 4.5rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: #fff;
  text-shadow: 0 4px 30px rgba(0,0,0,0.4);
  margin-bottom: 20px;
  line-height: 1.25;
}

.title-accent {
  background: linear-gradient(135deg, #00D4FF, #7CFC00);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.hero-sub {
  font-size: 1.25rem;
  color: var(--text-light);
  max-width: 640px;
  margin: 0 auto 36px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  margin-top: 44px;
  flex-wrap: wrap;
}

.hero-stat {
  text-align: center;
}

.hero-stat strong {
  display: block;
  font-size: 1.6rem;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, #00D4FF, #7CFC00);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-stat span {
  color: var(--text-sub);
  font-size: 0.85rem;
}

/* ===== Section Common ===== */
.page-section {
  padding: var(--section-pad) 0;
  position: relative;
}

.section-head {
  max-width: 720px;
  margin-bottom: 52px;
}

.section-head.centered {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--accent-green);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 12px;
  padding: 4px 12px;
  border: 1px solid rgba(124,252,0,0.35);
  border-radius: 4px;
  background: rgba(124,252,0,0.06);
}

.section-head h2 {
  font-size: clamp(2rem, 3.5vw, 3rem);
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--text-main);
  line-height: 1.3;
  margin-bottom: 16px;
}

.section-head .section-lead {
  color: var(--text-sub);
  font-size: 1rem;
  line-height: 1.8;
}

/* ===== Overview Rows ===== */
.overview-section {
  background: transparent;
}

.overview-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
  padding: 44px 0;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.overview-row:last-child {
  border-bottom: none;
}

.overview-media {
  position: relative;
}

.overview-media img {
  width: 100%;
  height: 360px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255,255,255,0.1);
  box-shadow: 0 12px 40px rgba(0,0,0,0.4);
}

.media-badge {
  position: absolute;
  top: 16px;
  left: 16px;
  padding: 6px 14px;
  background: rgba(10,26,47,0.75);
  border: 1px solid rgba(0,212,255,0.5);
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 700;
  border-radius: 6px;
  backdrop-filter: blur(6px);
}

.overview-content {
  padding: 8px 0;
}

.overview-content h3 {
  font-size: 1.5rem;
  color: var(--accent);
  margin-bottom: 16px;
  font-weight: 700;
}

.overview-content p {
  color: var(--text-light);
  margin-bottom: 20px;
}

.feature-list {
  margin-bottom: 24px;
}

.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  color: #C9D7EA;
  padding: 6px 0;
  font-size: 0.95rem;
}

.check-icon {
  flex-shrink: 0;
  display: inline-flex;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: rgba(124,252,0,0.12);
  color: var(--accent-green);
  font-size: 0.75rem;
  align-items: center;
  justify-content: center;
  margin-top: 4px;
  border: 1px solid rgba(124,252,0,0.3);
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--accent);
}

.text-link:hover {
  gap: 10px;
  color: #66E0FF;
}

/* ===== Steps Section ===== */
.steps-section {
  background: var(--bg-deep);
  border-top: 1px solid rgba(255,255,255,0.04);
  border-bottom: 1px solid rgba(255,255,255,0.04);
  overflow: hidden;
}

.steps-section::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}

.steps-section .container {
  z-index: 2;
}

.steps-track {
  display: flex;
  align-items: flex-start;
  gap: 0;
}

.step-item {
  flex: 1;
  text-align: center;
  padding: 0 16px;
  position: relative;
}

.step-dot {
  width: 52px;
  height: 52px;
  margin: 0 auto 16px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, #00D4FF, #0078FF);
  box-shadow: 0 0 0 6px rgba(0,212,255,0.12), 0 0 20px rgba(0,212,255,0.35);
  position: relative;
  z-index: 2;
}

.step-item:nth-child(even) .step-dot {
  box-shadow: 0 0 0 6px rgba(124,252,0,0.1), 0 0 20px rgba(124,252,0,0.25);
}

.step-line {
  flex: 0 0 60px;
  height: 2px;
  background: linear-gradient(90deg, rgba(0,212,255,0.6), rgba(124,252,0,0.4));
  margin-top: 26px;
  border-radius: 2px;
}

.step-item h3 {
  color: var(--text-main);
  font-size: 1.1rem;
  margin-bottom: 8px;
  font-weight: 700;
}

.step-item p {
  color: var(--text-sub);
  font-size: 0.9rem;
  line-height: 1.7;
  max-width: 200px;
  margin: 0 auto;
}

/* ===== Tips Grid ===== */
.tips-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.tip-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 40px 32px 32px;
  transition: all var(--transition);
  overflow: hidden;
}

.tip-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, #00D4FF, #7CFC00);
  opacity: 0;
  transition: opacity var(--transition);
}

.tip-card:hover {
  background: var(--surface-hover);
  border-color: var(--accent);
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
}

.tip-card:hover::before {
  opacity: 1;
}

.tip-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  margin-bottom: 20px;
}

.tip-icon-cyan {
  background: rgba(0,212,255,0.1);
  color: var(--accent);
  border: 1px solid rgba(0,212,255,0.3);
}

.tip-icon-green {
  background: rgba(124,252,0,0.1);
  color: var(--accent-green);
  border: 1px solid rgba(124,252,0,0.3);
}

.tip-badge {
  position: absolute;
  top: 20px;
  right: 20px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--accent-green);
  padding: 4px 10px;
  border-radius: 4px;
  border: 1px solid rgba(124,252,0,0.3);
  background: rgba(124,252,0,0.06);
}

.tip-card h3 {
  color: var(--text-main);
  font-size: 1.2rem;
  margin-bottom: 10px;
  font-weight: 700;
}

.tip-card p {
  color: var(--text-sub);
  font-size: 0.95rem;
  line-height: 1.75;
}

/* ===== FAQ ===== */
.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 12px;
  overflow: hidden;
  transition: background var(--transition), border-color var(--transition);
}

.faq-item.open {
  background: rgba(255,255,255,0.05);
  border-color: rgba(0,212,255,0.4);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 20px 24px;
  background: none;
  border: none;
  text-align: left;
  color: var(--text-main);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
}

.faq-que-text {
  flex: 1;
}

.faq-icon {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 1px solid rgba(0,212,255,0.4);
  color: var(--accent);
  font-size: 1.1rem;
  font-weight: 400;
  transition: transform var(--transition), background var(--transition);
}

.faq-item.open .faq-icon {
  transform: rotate(135deg);
  background: rgba(0,212,255,0.12);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  padding: 0 24px;
}

.faq-item.open .faq-answer {
  max-height: 220px;
  padding: 0 24px 20px;
}

.faq-answer p {
  color: var(--text-sub);
  font-size: 0.95rem;
  line-height: 1.85;
}

/* ===== CTA ===== */
.cta-section {
  position: relative;
  padding: 100px 0;
  background: linear-gradient(135deg, rgba(4,16,31,0.72), rgba(4,16,31,0.95)), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
  text-align: center;
  overflow: hidden;
}

.cta-section::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(500px 260px at 50% 50%, rgba(0,212,255,0.15), transparent 70%);
  pointer-events: none;
}

.cta-inner {
  position: relative;
  z-index: 2;
  max-width: 720px;
  margin: 0 auto;
}

.cta-inner h2 {
  font-size: clamp(2rem, 3.2vw, 2.75rem);
  color: #fff;
  margin-bottom: 16px;
  font-weight: 700;
}

.cta-inner p {
  color: var(--text-light);
  font-size: 1.05rem;
  margin-bottom: 32px;
}

/* ===== Footer ===== */
.site-footer {
  background: var(--bg-deep);
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 80px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 60px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}

.logo-text {
  font-weight: 700;
  color: #fff;
  font-size: 1.05rem;
  white-space: nowrap;
}

.footer-brand p {
  color: var(--text-sub);
  font-size: 0.92rem;
  max-width: 340px;
}

.footer-col h4 {
  color: var(--text-main);
  font-size: 1rem;
  margin-bottom: 18px;
  font-weight: 700;
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul a {
  color: var(--text-sub);
  font-size: 0.92rem;
}

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

.footer-contact p {
  color: var(--text-sub);
  font-size: 0.92rem;
}

.footer-contact-email {
  color: var(--accent);
}

.footer-bottom {
  padding-top: 24px;
  text-align: center;
}

.footer-bottom p {
  color: #6E849C;
  font-size: 0.85rem;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .nav-wrap {
    padding: 0 24px;
  }

  .nav-left {
    gap: 20px;
  }

  .nav-right {
    gap: 20px;
  }

  .footer-grid {
    gap: 40px;
  }

  .overview-row {
    gap: 40px;
  }

  .step-line {
    flex-basis: 30px;
  }

  .hero-title {
    font-size: clamp(2.4rem, 4vw, 3.6rem);
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 20px;
  }

  .nav-wrap {
    padding: 0 20px;
    height: 64px;
    justify-content: space-between;
  }

  .nav-left,
  .nav-right {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .site-logo {
    position: static;
    transform: none;
    font-size: 0.95rem;
  }

  .logo-mark {
    width: 32px;
    height: 32px;
  }

  .logo-mark svg {
    width: 18px;
    height: 18px;
  }

  .category-hero {
    min-height: 460px;
    padding: 120px 20px 80px;
  }

  .hero-title {
    font-size: 2.4rem;
  }

  .hero-sub {
    font-size: 1.05rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .hero-stats {
    gap: 32px;
    margin-top: 36px;
  }

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

  .section-head {
    margin-bottom: 36px;
  }

  .overview-row {
    grid-template-columns: 1fr;
    gap: 28px;
    padding: 28px 0;
  }

  .overview-media img {
    height: 240px;
  }

  .steps-track {
    flex-direction: column;
    align-items: center;
    gap: 0;
  }

  .step-line {
    width: 2px;
    height: 40px;
    flex: none;
    margin: 0;
  }

  .step-item {
    padding: 16px 0;
  }

  .step-item p {
    max-width: 260px;
  }

  .tips-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .tip-card {
    padding: 28px 24px 24px;
  }

  .cta-section {
    padding: 60px 0;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 36px;
    padding-bottom: 36px;
  }

  .site-footer {
    padding-top: 50px;
  }
}

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

  .nav-wrap {
    padding: 0 16px;
  }

  .site-logo .logo-text {
    font-size: 0.9rem;
  }

  .category-hero {
    padding: 110px 16px 60px;
    min-height: 400px;
  }

  .hero-title {
    font-size: 2rem;
  }

  .hero-sub {
    font-size: 0.98rem;
  }

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

  .hero-stats {
    gap: 24px;
  }

  .hero-stat strong {
    font-size: 1.4rem;
  }

  .overview-content h3 {
    font-size: 1.3rem;
  }

  .overview-media img {
    height: 200px;
  }

  .tip-card {
    padding: 26px 20px 22px;
  }

  .step-item h3 {
    font-size: 1rem;
  }

  .faq-question {
    padding: 16px 18px;
    font-size: 0.95rem;
  }

  .faq-item.open .faq-answer {
    padding: 0 18px 16px;
  }

  .btn {
    padding: 11px 20px;
    font-size: 0.95rem;
  }

  .btn-large {
    padding: 14px 28px;
    font-size: 1rem;
  }

  .footer-bottom p {
    font-size: 0.8rem;
  }
}