/* roulang page: index */
/* ============ 设计变量 ============ */
:root {
  --bg-deep: #0B1020;
  --bg-main: #0D1424;
  --bg-card: #111830;
  --bg-card-2: #16203A;
  --brand-blue: #5B7FFF;
  --brand-purple: #8A5CFF;
  --brand-pink: #C86BFF;
  --accent: #31E5C5;
  --gold: #F5C765;
  --text-main: #EDF1FB;
  --text-sub: #A6B0D4;
  --text-dim: #6C769A;
  --border-color: rgba(255,255,255,0.08);
  --radius-lg: 20px;
  --radius-md: 16px;
  --radius-sm: 10px;
  --shadow-card: 0 10px 30px rgba(0,0,0,0.3);
  --shadow-hover: 0 16px 40px rgba(90,60,255,0.18), 0 4px 12px rgba(0,0,0,0.3);
  --shadow-btn: 0 6px 20px rgba(91,127,255,0.35);
  --grad-brand: linear-gradient(120deg, #31E5C5, #5B7FFF, #C86BFF);
  --grad-btn: linear-gradient(135deg, #5B7FFF, #8A5CFF);
  --font-main: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --sidebar-w: 240px;
  --topbar-h: 56px;
}

/* ============ Reset / 基础 ============ */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-main);
  background-color: var(--bg-deep);
  background-image: radial-gradient(rgba(255,255,255,0.035) 1px, transparent 1px);
  background-size: 34px 34px;
  color: var(--text-main);
  line-height: 1.8;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
h1, h2, h3, h4, p { margin: 0; }
ul { list-style: none; margin: 0; padding: 0; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.container-narrow { max-width: 860px; }

/* ============ 左侧导航 ============ */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-w);
  height: 100vh;
  background: var(--bg-main);
  background-image: radial-gradient(circle at 30% 15%, rgba(91,127,255,0.1), transparent 58%);
  border-right: 1px solid var(--border-color);
  z-index: 100;
  display: flex;
  flex-direction: column;
  padding: 28px 20px 24px;
  overflow-y: auto;
}
.sidebar-inner { display: flex; flex-direction: column; height: 100%; min-height: 480px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-size: 19px; font-weight: 800; letter-spacing: 0.01em; padding: 0 4px; }
.brand-mark {
  width: 38px;
  height: 38px;
  border-radius: 12px;
  background: var(--grad-btn);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 17px;
  color: #fff;
  box-shadow: 0 0 18px rgba(91,127,255,0.45);
  flex: none;
}
.brand-text { white-space: nowrap; }
.side-nav { margin-top: 38px; display: flex; flex-direction: column; gap: 4px; }
.side-nav a {
  position: relative;
  display: flex;
  align-items: center;
  padding: 11px 14px 11px 20px;
  border-radius: var(--radius-sm);
  color: var(--text-sub);
  font-size: 15px;
  font-weight: 500;
  transition: all .25s ease;
}
.side-nav a:hover { color: var(--text-main); background: rgba(91,127,255,0.12); }
.side-nav a.active { color: var(--text-main); background: rgba(91,127,255,0.12); font-weight: 600; }
.side-nav a.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 18%;
  height: 64%;
  width: 3px;
  border-radius: 0 3px 3px 0;
  background: var(--grad-brand);
}
.sidebar-bottom { margin-top: auto; display: flex; flex-direction: column; gap: 14px; }
.sky-status {
  display: flex;
  align-items: center;
  gap: 10px;
  background: rgba(49,229,197,0.07);
  border: 1px solid rgba(49,229,197,0.22);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
}
.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px rgba(49,229,197,0.8);
  flex: none;
  animation: pulse 2.2s ease-in-out infinite;
}
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: .45; } }
.status-label { font-size: 11px; color: var(--accent); font-weight: 600; letter-spacing: .04em; line-height: 1.3; }
.status-text { font-size: 12px; color: var(--text-sub); line-height: 1.4; }
.side-cta {
  display: block;
  text-align: center;
  padding: 11px 16px;
  border-radius: var(--radius-sm);
  background: var(--grad-btn);
  color: #fff;
  font-weight: 600;
  font-size: 14px;
  box-shadow: var(--shadow-btn);
  transition: all .25s ease;
}
.side-cta:hover { transform: translateY(-2px); filter: brightness(1.08); box-shadow: 0 8px 26px rgba(91,127,255,0.45); }

/* ============ 移动端顶栏 ============ */
.topbar {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--topbar-h);
  background: rgba(13,20,36,0.96);
  border-bottom: 1px solid var(--border-color);
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  z-index: 200;
  backdrop-filter: blur(10px);
}
.topbar-left { display: flex; align-items: center; gap: 10px; }
.menu-btn { font-size: 20px; width: 38px; height: 38px; display: flex; align-items: center; justify-content: center; border-radius: 8px; color: var(--text-main); transition: background .2s; }
.menu-btn:hover { background: rgba(91,127,255,0.14); }
.topbar-brand { font-weight: 800; font-size: 17px; }
.topbar-cta { font-size: 13px; font-weight: 600; background: var(--grad-btn); padding: 8px 14px; border-radius: 8px; color: #fff; box-shadow: var(--shadow-btn); transition: all .25s ease; }
.topbar-cta:hover { transform: translateY(-1px); filter: brightness(1.08); }
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.55);
  z-index: 90;
  opacity: 0;
  pointer-events: none;
  transition: opacity .3s ease;
}
.sidebar-overlay.visible { opacity: 1; pointer-events: auto; }

/* ============ 主内容区 ============ */
.app-main { margin-left: var(--sidebar-w); min-height: 100vh; display: flex; flex-direction: column; }

/* ============ 按钮 ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  transition: all .25s ease;
  border: none;
  cursor: pointer;
}
.btn-primary { background: var(--grad-btn); color: #fff; box-shadow: var(--shadow-btn); }
.btn-primary:hover { transform: translateY(-2px); filter: brightness(1.1); box-shadow: 0 10px 30px rgba(91,127,255,0.5); }
.btn-outline { background: transparent; border: 1.5px solid var(--brand-blue); color: var(--text-sub); }
.btn-outline:hover { background: rgba(91,127,255,0.12); color: var(--text-main); transform: translateY(-2px); }
.btn-xl { padding: 18px 48px; font-size: 18px; border-radius: 14px; }

.text-link { color: var(--accent); font-weight: 500; font-size: 14px; transition: color .2s, text-decoration .2s; }
.text-link:hover { color: var(--gold); text-decoration: underline; }

/* ============ 首屏 Hero ============ */
.hero {
  min-height: 720px;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  background-image: linear-gradient(180deg, rgba(11,16,32,0.55), #0B1020 85%), url('/assets/images/backpic/back-1.png');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  padding: 84px 0 64px;
}
.hero::before {
  content: '';
  position: absolute;
  width: 480px;
  height: 480px;
  left: 26%;
  top: -15%;
  background: radial-gradient(circle, rgba(138,92,255,0.2), transparent 70%);
  filter: blur(70px);
  pointer-events: none;
}
.hero-content { position: relative; z-index: 2; max-width: 660px; }
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(49,229,197,0.09);
  border: 1px solid rgba(49,229,197,0.25);
  color: var(--accent);
  font-size: 13px;
  font-weight: 500;
  border-radius: 999px;
  padding: 6px 14px;
  margin-bottom: 26px;
}
.hero-badge .hero-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 8px rgba(49,229,197,0.9); }
.hero h1 {
  font-size: clamp(34px, 5vw, 56px);
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: 0.01em;
  text-wrap: balance;
}
.hero h1 .grad-text {
  background: var(--grad-brand);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-sub {
  margin-top: 22px;
  font-size: 17px;
  color: var(--text-sub);
  max-width: 540px;
  line-height: 1.8;
}
.hero-actions { margin-top: 34px; display: flex; flex-wrap: wrap; gap: 14px; }
.hero-stats { margin-top: 54px; display: flex; flex-wrap: wrap; gap: 12px; }
.stat-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(13,20,36,0.72);
  border: 1px solid var(--border-color);
  border-radius: 999px;
  padding: 10px 18px;
  backdrop-filter: blur(6px);
}
.stat-pill b { font-size: clamp(20px, 3vw, 26px); font-weight: 700; color: var(--accent); line-height: 1.2; }
.stat-pill span { font-size: 12px; color: var(--text-sub); line-height: 1.4; }

/* ============ 通用板块 ============ */
.section { padding: clamp(64px, 10vw, 110px) 0; position: relative; }
.section-alt { background: var(--bg-main); }
.section-head { margin-bottom: 46px; }
.section-head h2 { font-size: clamp(26px, 3.5vw, 38px); font-weight: 700; line-height: 1.3; text-wrap: balance; }
.section-head .section-sub { color: var(--text-sub); margin-top: 10px; font-size: 15px; }
.section-head-flex { display: flex; align-items: flex-end; justify-content: space-between; gap: 20px; flex-wrap: wrap; }

/* ============ 玩法介绍 ============ */
.section-play::before {
  content: '';
  position: absolute;
  width: 420px;
  height: 420px;
  right: -120px;
  top: 60px;
  background: radial-gradient(circle, rgba(138,92,255,0.09), transparent 70%);
  pointer-events: none;
}
.play-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: 20px; position: relative; z-index: 2; }
.play-card {
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  position: relative;
  transition: box-shadow .3s ease, transform .3s ease;
}
.play-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-3px); }
.play-card-featured { grid-row: span 2; min-height: 440px; }
.play-card-featured > img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.play-card-featured::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(17,24,48,0.18) 30%, rgba(17,24,48,0.94) 92%);
}
.play-card-featured .play-card-body {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  z-index: 2;
  padding: 30px;
}
.play-card-featured .play-card-body h3 { font-size: 25px; color: #fff; }
.play-card-featured .play-card-body p { color: rgba(237,241,251,0.72); font-size: 14px; margin-top: 8px; line-height: 1.7; }
.play-card-featured .play-card-body .text-link { margin-top: 16px; display: inline-block; }
.icon-orb {
  width: 42px;
  height: 42px;
  flex: none;
  border-radius: 12px;
  background: rgba(91,127,255,0.14);
  border: 1px solid rgba(91,127,255,0.26);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: var(--brand-pink);
  margin-bottom: 14px;
}
.play-card h3 { font-size: 20px; font-weight: 600; color: var(--text-main); }
.play-card p { color: var(--text-sub); font-size: 14px; line-height: 1.7; margin-top: 6px; }
.play-card-right { display: grid; grid-template-columns: 1fr 138px; min-height: 174px; }
.play-card-right .play-card-content { padding: 26px 22px; display: flex; flex-direction: column; }
.play-card-right img { width: 100%; height: 100%; object-fit: cover; }
.play-card-wide { grid-column: 1 / -1; display: grid; grid-template-columns: 1fr 260px; min-height: 186px; }
.play-card-wide .play-card-body { padding: 30px; display: flex; align-items: flex-start; gap: 18px; }
.play-card-wide .play-card-body .icon-orb { margin-bottom: 0; }
.play-card-wide img { width: 100%; height: 100%; object-fit: cover; }

/* ============ 观测奖励 ============ */
.section-rewards { background: var(--bg-main); }
.section-rewards::after {
  content: '';
  position: absolute;
  width: 360px;
  height: 360px;
  left: -100px;
  bottom: -40px;
  background: radial-gradient(circle, rgba(49,229,197,0.07), transparent 70%);
  pointer-events: none;
}
.rewards-card {
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--bg-card-2), var(--bg-card));
  border: 1px solid var(--border-color);
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 44px;
  padding: 44px;
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
}
.rewards-card::before {
  content: '';
  position: absolute;
  width: 320px;
  height: 320px;
  right: -90px;
  top: -90px;
  background: radial-gradient(circle, rgba(200,107,255,0.16), transparent 70%);
  filter: blur(50px);
  pointer-events: none;
}
.rewards-content { position: relative; z-index: 2; }
.rewards-content h3 { font-size: clamp(24px, 3vw, 32px); font-weight: 700; line-height: 1.35; text-wrap: balance; }
.rewards-desc { color: var(--text-sub); margin-top: 12px; max-width: 480px; font-size: 15px; }
.rewards-list { margin-top: 30px; display: flex; flex-direction: column; gap: 18px; }
.rewards-list li { display: flex; align-items: flex-start; gap: 14px; }
.reward-icon {
  width: 38px;
  height: 38px;
  flex: none;
  border-radius: 10px;
  background: rgba(49,229,197,0.1);
  border: 1px solid rgba(49,229,197,0.22);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
}
.reward-title { font-size: 15px; font-weight: 600; color: var(--text-main); }
.reward-sub { font-size: 13px; color: var(--text-dim); line-height: 1.5; margin-top: 2px; }
.rewards-wall {
  position: relative;
  z-index: 2;
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: center;
  gap: 16px;
  padding: 24px 0;
}
.badge-item {
  width: 88px;
  height: 88px;
  border-radius: 22px;
  background: rgba(255,255,255,0.04);
  border: 1px dashed rgba(255,255,255,0.16);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  color: var(--text-dim);
  transition: all .35s ease;
  cursor: default;
}
.badge-item .badge-icon { font-size: 24px; line-height: 1; }
.badge-item .badge-name { font-size: 11px; font-weight: 500; }
.badge-lg { width: 112px; height: 112px; border-radius: 28px; }
.badge-md { width: 96px; height: 96px; border-radius: 24px; }
.badge-sm { width: 76px; height: 76px; border-radius: 18px; }
.badge-sm .badge-icon { font-size: 20px; }
.badge-item.unlocked {
  background: linear-gradient(135deg, rgba(91,127,255,0.18), rgba(138,92,255,0.18));
  border: 1px solid rgba(91,127,255,0.48);
  color: var(--text-main);
  box-shadow: 0 0 20px rgba(91,127,255,0.18);
}
.badge-item.unlocked .badge-icon { color: var(--accent); }
.badge-item:hover {
  border-color: var(--brand-blue);
  border-style: solid;
  color: var(--text-main);
  background: linear-gradient(135deg, rgba(91,127,255,0.24), rgba(200,107,255,0.2));
  transform: translateY(-4px);
  box-shadow: 0 8px 28px rgba(91,127,255,0.28);
}

/* ============ 任务进度 ============ */
.section-progress::before {
  content: '';
  position: absolute;
  width: 380px;
  height: 380px;
  left: 30%;
  top: -120px;
  background: radial-gradient(circle, rgba(91,127,255,0.09), transparent 70%);
  pointer-events: none;
}
.progress-track {
  display: grid;
  grid-template-columns: 1fr 1fr 1.08fr 1fr 1fr;
  gap: 18px;
  align-items: start;
  position: relative;
  z-index: 2;
}
.step-node {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 28px 18px 24px;
  text-align: center;
  transition: box-shadow .3s ease, transform .3s ease;
}
.step-node:hover { box-shadow: var(--shadow-hover); transform: translateY(-2px); }
.step-num {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 16px;
  background: rgba(255,255,255,0.06);
  color: var(--text-dim);
  border: 1px solid var(--border-color);
  margin-bottom: 14px;
}
.step-num.done { background: rgba(49,229,197,0.14); border-color: rgba(49,229,197,0.4); color: var(--accent); }
.step-num.current { background: var(--grad-btn); border: none; color: #fff; box-shadow: 0 0 18px rgba(91,127,255,0.55); }
.step-node h3 { font-size: 16px; font-weight: 600; color: var(--text-main); margin-bottom: 6px; }
.step-node p { font-size: 13px; color: var(--text-dim); line-height: 1.6; }
.progress-mini-card {
  background: radial-gradient(circle at 30% 15%, rgba(49,229,197,0.12), transparent 70%), var(--bg-card);
  border: 1px solid rgba(49,229,197,0.28);
  border-radius: var(--radius-md);
  padding: 26px 20px;
  text-align: center;
  align-self: center;
  box-shadow: var(--shadow-card);
}
.ring {
  width: 74px;
  height: 74px;
  border-radius: 50%;
  margin: 0 auto 12px;
  background: conic-gradient(var(--accent) 0% 64%, rgba(255,255,255,0.08) 64% 100%);
  display: flex;
  align-items: center;
  justify-content: center;
}
.ring span {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--bg-card);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 17px;
  color: var(--accent);
}
.progress-mini-card p { font-size: 12px; color: var(--text-sub); line-height: 1.7; }
.progress-mini-card p b { color: var(--accent); font-weight: 600; }

/* ============ CTA ============ */
.cta-card {
  border-radius: var(--radius-lg);
  background-image: linear-gradient(180deg, rgba(11,16,32,0.74), rgba(11,16,32,0.92)), url('/assets/images/backpic/back-2.webp');
  background-size: cover;
  background-position: center;
  border: 1px solid var(--border-color);
  text-align: center;
  padding: clamp(60px, 8vw, 100px) 32px;
  position: relative;
  overflow: hidden;
}
.cta-card::before {
  content: '';
  position: absolute;
  width: 520px;
  height: 520px;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle, rgba(91,127,255,0.2), transparent 70%);
  filter: blur(70px);
  pointer-events: none;
}
.cta-card h2 { position: relative; z-index: 2; font-size: clamp(26px, 3.5vw, 38px); font-weight: 700; line-height: 1.35; text-wrap: balance; }
.cta-card .btn-xl { position: relative; z-index: 2; margin-top: 32px; }
.cta-note { position: relative; z-index: 2; margin-top: 18px; color: var(--text-dim); font-size: 13px; }

/* ============ 资讯列表（CMS） ============ */
.section-news { background: var(--bg-main); border-top: 1px solid var(--border-color); }
.news-list { display: flex; flex-direction: column; gap: 12px; }
.news-row {
  display: flex;
  align-items: center;
  gap: 18px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 18px 22px;
  transition: all .25s ease;
}
.news-row:hover { border-color: rgba(49,229,197,0.4); box-shadow: var(--shadow-hover); transform: translateX(4px); }
.news-date {
  flex: none;
  width: 52px;
  height: 58px;
  border-radius: 10px;
  background: rgba(49,229,197,0.08);
  border: 1px solid rgba(49,229,197,0.22);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0;
}
.news-day { font-size: 20px; font-weight: 700; color: var(--accent); line-height: 1.2; }
.news-month { font-size: 11px; color: var(--text-sub); line-height: 1.4; }
.news-main { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 4px; }
.news-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-main);
  transition: color .2s;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.news-row:hover .news-title { color: var(--accent); }
.news-excerpt {
  font-size: 13px;
  color: var(--text-dim);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.news-tag {
  flex: none;
  font-size: 12px;
  font-weight: 500;
  color: var(--brand-pink);
  background: rgba(200,107,255,0.1);
  border: 1px solid rgba(200,107,255,0.25);
  border-radius: 999px;
  padding: 4px 14px;
  white-space: nowrap;
}
.news-empty {
  text-align: center;
  padding: 60px 20px;
  background: var(--bg-card);
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-dim);
  font-size: 15px;
}

/* ============ FAQ ============ */
.faq-list.accordion { background: transparent; display: flex; flex-direction: column; gap: 12px; }
.faq-list .accordion-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: 0;
}
.faq-list .accordion-item:first-child > :first-child,
.faq-list .accordion-item:last-child > :last-child { border-radius: var(--radius-md); }
.faq-list .accordion-title {
  border: none;
  border-bottom: 1px solid transparent;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-main);
  padding: 18px 48px 18px 22px;
  line-height: 1.5;
  border-radius: var(--radius-md) !important;
  transition: background .2s, color .2s;
}
.faq-list .accordion-title:hover,
.faq-list .accordion-title:focus { background: rgba(91,127,255,0.08); color: var(--accent); }
.faq-list .accordion-title::before {
  content: '+';
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 22px;
  font-weight: 400;
  color: var(--accent);
  transition: transform .25s ease;
  line-height: 1;
}
.faq-list .accordion-item.is-active > .accordion-title::before { content: '–'; transform: translateY(-50%); }
.faq-list .accordion-title::after { content: none; }
.faq-list .accordion-content {
  border: none;
  border-top: 1px solid var(--border-color);
  background: transparent;
  color: var(--text-sub);
  font-size: 14px;
  line-height: 1.9;
  padding: 16px 22px 22px;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
}

/* ============ 页脚 ============ */
.site-footer {
  background: #0A0F1D;
  border-top: 1px solid var(--border-color);
  padding: 52px 0 0;
  margin-top: auto;
}
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr; gap: 36px; padding-bottom: 40px; }
.footer-brand .brand { padding: 0; }
.footer-brand p { margin-top: 14px; color: var(--text-dim); font-size: 13px; line-height: 1.7; }
.footer-title { font-size: 14px; font-weight: 600; color: var(--text-main); margin-bottom: 14px; }
.footer-nav { display: flex; flex-direction: column; gap: 8px; }
.footer-nav a { color: var(--text-sub); font-size: 13px; transition: color .2s; }
.footer-nav a:hover { color: var(--accent); }
.footer-meta { color: var(--text-dim); font-size: 13px; line-height: 1.9; }
.copyright {
  border-top: 1px solid var(--border-color);
  padding: 22px 0;
  color: var(--text-dim);
  font-size: 12px;
  text-align: center;
}

/* ============ 可访问性 & 动效 ============ */
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.reveal.visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ============ 响应式 ============ */
@media (max-width: 1100px) {
  .progress-track { grid-template-columns: 1fr 1fr 1fr; }
  .progress-mini-card { grid-column: span 1; }
}

@media (max-width: 1024px) {
  :root { --sidebar-w: 200px; }
  .play-grid { grid-template-columns: 1fr; }
  .play-card-featured { grid-row: auto; min-height: 320px; }
  .play-card-featured > img { position: relative; height: 260px; }
  .play-card-featured::after { background: linear-gradient(180deg, rgba(17,24,48,0.1) 40%, rgba(17,24,48,0.92) 95%); }
  .play-card-featured .play-card-body { position: relative; }
  .play-card-wide { grid-column: auto; }
  .rewards-card { grid-template-columns: 1fr; gap: 28px; padding: 34px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .sidebar { padding: 24px 16px; }
  .side-nav a { font-size: 14px; padding: 10px 10px 10px 16px; }
}

@media (max-width: 640px) {
  .topbar { display: flex; }
  .sidebar {
    transform: translateX(-100%);
    transition: transform .3s ease;
    width: 240px;
    box-shadow: 0 0 40px rgba(0,0,0,0.5);
  }
  .sidebar.open { transform: translateX(0); }
  .sidebar-overlay { display: block; }
  .app-main { margin-left: 0; padding-top: var(--topbar-h); }
  .container { padding: 0 16px; }
  .hero { min-height: 80vh; padding: 60px 0 44px; }
  .hero h1 { font-size: 34px; }
  .hero-sub { font-size: 15px; }
  .hero-actions { flex-direction: column; width: 100%; }
  .hero-actions .btn { width: 100%; }
  .hero-stats { flex-direction: column; gap: 10px; }
  .stat-pill { width: 100%; }
  .section { padding: 64px 0; }
  .play-card-featured { min-height: 0; }
  .play-card-featured > img { position: relative; height: 220px; }
  .play-card-right { grid-template-columns: 1fr; }
  .play-card-right img { height: 140px; }
  .play-card-wide { grid-template-columns: 1fr; }
  .play-card-wide img { height: 140px; }
  .play-card-wide .play-card-body { flex-direction: column; gap: 12px; }
  .play-card-wide .play-card-body .icon-orb { margin-bottom: 0; }
  .rewards-card { padding: 28px 20px; border-radius: var(--radius-md); }
  .rewards-wall { gap: 12px; padding: 12px 0 0; }
  .badge-item { width: 80px; height: 80px; border-radius: 20px; }
  .badge-lg { width: 102px; height: 102px; border-radius: 26px; }
  .badge-md { width: 88px; height: 88px; }
  .badge-sm { width: 70px; height: 70px; }
  .progress-track { grid-template-columns: 1fr; }
  .progress-mini-card { grid-column: auto; order: 3; }
  .news-row { flex-wrap: wrap; gap: 12px; padding: 16px; }
  .news-main { width: 100%; order: 3; }
  .news-title, .news-excerpt { white-space: normal; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
  .cta-card { padding: 56px 20px; }
  .cta-card .btn-xl { width: 100%; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
}

/* roulang page: category1 */
:root {
            --bg: #0B1020;
            --bg-2: #111830;
            --bg-3: #16203A;
            --nav-bg: #0D1424;
            --line: rgba(255, 255, 255, 0.08);
            --text: #EDF1FB;
            --text-2: #A6B0D4;
            --text-3: #6C769A;
            --primary: #5B7FFF;
            --purple: #8A5CFF;
            --pink: #C86BFF;
            --cyan: #31E5C5;
            --gold: #F5C765;
            --grad-main: linear-gradient(135deg, #5B7FFF, #8A5CFF, #C86BFF);
            --grad-text: linear-gradient(120deg, #31E5C5, #5B7FFF, #C86BFF);
            --radius-lg: 20px;
            --radius-md: 16px;
            --radius-sm: 10px;
            --shadow-card: 0 10px 30px rgba(0, 0, 0, 0.3);
            --shadow-hover: 0 16px 40px rgba(90, 60, 255, 0.18), 0 4px 12px rgba(0, 0, 0, 0.3);
            --space-section: clamp(64px, 10vw, 110px);
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
            background: var(--bg);
            color: var(--text);
            font-size: 16px;
            line-height: 1.8;
            -webkit-font-smoothing: antialiased;
        }

        a {
            color: var(--primary);
            text-decoration: none;
            transition: color 0.25s ease;
        }
        a:hover {
            color: var(--cyan);
        }

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

        button {
            font-family: inherit;
            cursor: pointer;
        }

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

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

        .app-shell {
            display: flex;
            min-height: 100vh;
        }

        /* ===== 品牌 ===== */
        .brand {
            display: inline-flex;
            align-items: center;
            gap: 10px;
        }

        .brand-mark {
            font-size: 26px;
            color: var(--gold);
            text-shadow: 0 0 14px rgba(245, 199, 101, 0.5);
            line-height: 1;
        }

        .brand-text {
            font-size: 20px;
            font-weight: 800;
            letter-spacing: 0.02em;
            background: var(--grad-text);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }

        .brand-small .brand-text {
            font-size: 17px;
        }

        /* ===== 移动端顶部条 ===== */
        .mobile-topbar {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: 56px;
            z-index: 80;
            background: rgba(13, 20, 36, 0.92);
            backdrop-filter: blur(8px);
            border-bottom: 1px solid var(--line);
            align-items: center;
            justify-content: space-between;
            padding: 0 16px;
        }

        .menu-toggle {
            background: transparent;
            border: 1px solid var(--line);
            color: var(--text);
            border-radius: 8px;
            width: 38px;
            height: 38px;
            font-size: 18px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            transition: border-color 0.25s ease, background 0.25s ease;
        }
        .menu-toggle:hover {
            border-color: var(--primary);
            background: rgba(91, 127, 255, 0.12);
        }

        /* ===== 左侧导航 ===== */
        .side-nav {
            position: fixed;
            top: 0;
            left: 0;
            width: 240px;
            height: 100vh;
            background: var(--nav-bg);
            border-right: 1px solid var(--line);
            z-index: 90;
            display: flex;
            flex-direction: column;
            padding: 28px 16px 20px;
        }

        .nav-inner {
            display: flex;
            flex-direction: column;
            height: 100%;
        }

        .side-nav-links {
            display: flex;
            flex-direction: column;
            gap: 4px;
            margin-top: 40px;
        }

        .side-nav-links a {
            position: relative;
            display: flex;
            align-items: center;
            padding: 12px 16px 12px 20px;
            border-radius: 10px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-2);
            background: transparent;
            transition: background 0.25s ease, color 0.25s ease, box-shadow 0.25s ease;
        }

        .side-nav-links a::before {
            content: "";
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%) scaleY(0);
            width: 3px;
            height: 20px;
            border-radius: 0 4px 4px 0;
            background: var(--grad-main);
            transition: transform 0.25s ease;
        }

        .side-nav-links a:hover {
            background: rgba(91, 127, 255, 0.12);
            color: var(--text);
        }

        .side-nav-links a:hover::before {
            transform: translateY(-50%) scaleY(1);
        }

        .side-nav-links a.active {
            background: rgba(91, 127, 255, 0.12);
            color: var(--text);
            font-weight: 600;
        }

        .side-nav-links a.active::before {
            transform: translateY(-50%) scaleY(1);
        }

        .nav-sky {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-top: auto;
            padding: 14px 16px;
            border-radius: 12px;
            background: rgba(91, 127, 255, 0.08);
            border: 1px solid var(--line);
            font-size: 13px;
            color: var(--text-2);
        }

        .sky-dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--cyan);
            box-shadow: 0 0 8px rgba(49, 229, 197, 0.8);
            flex-shrink: 0;
        }

        .nav-cta {
            display: block;
            text-align: center;
            margin-top: 14px;
            padding: 10px 12px;
            border-radius: var(--radius-sm);
            background: var(--grad-main);
            color: #fff;
            font-size: 14px;
            font-weight: 600;
            opacity: 0.92;
            transition: opacity 0.25s ease, transform 0.25s ease, box-shadow 0.25s ease;
            box-shadow: 0 6px 20px rgba(91, 127, 255, 0.35);
        }
        .nav-cta:hover {
            opacity: 1;
            transform: translateY(-1px);
            color: #fff;
            box-shadow: 0 8px 28px rgba(91, 127, 255, 0.45);
        }

        .nav-close {
            display: none;
            position: absolute;
            top: 12px;
            right: 8px;
            background: transparent;
            border: none;
            color: var(--text-2);
            font-size: 28px;
            line-height: 1;
            padding: 6px;
            border-radius: 8px;
        }
        .nav-close:hover {
            color: var(--text);
            background: rgba(255, 255, 255, 0.06);
        }

        .nav-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(4, 8, 18, 0.6);
            z-index: 70;
            backdrop-filter: blur(2px);
        }

        /* ===== 主内容区 ===== */
        .page-main {
            width: calc(100% - 240px);
            margin-left: 240px;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        /* ===== Hero ===== */
        .category-hero {
            position: relative;
            padding: clamp(64px, 9vw, 120px) 0 56px;
            background-image: linear-gradient(180deg, rgba(11, 16, 32, 0.72), #0B1020 92%), url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            border-bottom: 1px solid var(--line);
            overflow: hidden;
        }

        .category-hero::after {
            content: "";
            position: absolute;
            top: -40%;
            right: -10%;
            width: 420px;
            height: 420px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(138, 92, 255, 0.2), transparent 65%);
            pointer-events: none;
        }

        .breadcrumb {
            font-size: 13px;
            color: var(--text-3);
            margin-bottom: 18px;
            letter-spacing: 0.02em;
        }

        .breadcrumb a {
            color: var(--text-3);
            transition: color 0.25s ease;
        }
        .breadcrumb a:hover {
            color: var(--cyan);
        }
        .breadcrumb .sep {
            margin: 0 8px;
            color: var(--text-3);
        }
        .breadcrumb .current {
            color: var(--text-2);
        }

        .category-hero h1 {
            font-size: clamp(34px, 5vw, 52px);
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 20px;
            text-wrap: balance;
            letter-spacing: -0.01em;
        }

        .hero-grad {
            background: var(--grad-text);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }

        .hero-lead {
            max-width: 680px;
            font-size: 16px;
            line-height: 1.85;
            color: var(--text-2);
            margin-bottom: 34px;
        }

        .hero-badges {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
        }

        .badge {
            display: inline-flex;
            align-items: baseline;
            gap: 6px;
            background: rgba(49, 229, 197, 0.12);
            border: 1px solid rgba(49, 229, 197, 0.25);
            border-radius: 999px;
            padding: 8px 16px;
            font-size: 13px;
            color: var(--text-2);
        }

        .badge strong {
            font-size: clamp(18px, 2.4vw, 24px);
            font-weight: 700;
            color: var(--cyan);
            line-height: 1;
        }

        /* ===== 板块通用 ===== */
        .section-block {
            padding: var(--space-section) 0;
        }

        .section-head {
            margin-bottom: 42px;
            max-width: 760px;
        }

        .section-kicker {
            display: inline-block;
            font-size: 13px;
            font-weight: 700;
            letter-spacing: 0.1em;
            color: var(--cyan);
            background: rgba(49, 229, 197, 0.1);
            border-radius: 999px;
            padding: 4px 14px;
            margin-bottom: 14px;
        }

        .section-head h2 {
            font-size: clamp(26px, 3.5vw, 38px);
            font-weight: 700;
            line-height: 1.3;
            margin-bottom: 8px;
        }

        .section-note {
            color: var(--text-3);
            font-size: 15px;
        }

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

        /* ===== 引导卡片（交错式） ===== */
        .guide-collection {
            padding: var(--space-section) 0 0;
        }

        .guide-cards {
            display: flex;
            flex-direction: column;
            gap: 36px;
        }

        .guide-card {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 0;
            background: var(--bg-2);
            border: 1px solid var(--line);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            transition: box-shadow 0.35s ease, transform 0.35s ease;
        }

        .guide-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-2px);
        }

        .guide-media {
            position: relative;
            min-height: 260px;
            overflow: hidden;
        }

        .guide-media img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            position: absolute;
            inset: 0;
            transition: transform 0.5s ease;
        }

        .guide-card:hover .guide-media img {
            transform: scale(1.03);
        }

        .guide-media::after {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, transparent 55%, rgba(17, 24, 48, 0.88));
            pointer-events: none;
        }

        .guide-num {
            position: absolute;
            top: 18px;
            left: 18px;
            z-index: 2;
            font-size: 13px;
            font-weight: 700;
            letter-spacing: 0.08em;
            color: #fff;
            background: rgba(11, 16, 32, 0.55);
            border: 1px solid rgba(255, 255, 255, 0.2);
            padding: 4px 12px;
            border-radius: 999px;
            backdrop-filter: blur(4px);
        }

        .guide-body {
            padding: clamp(24px, 3.4vw, 40px);
            display: flex;
            flex-direction: column;
            justify-content: center;
        }

        .guide-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-bottom: 14px;
        }

        .tag {
            display: inline-block;
            font-size: 12px;
            font-weight: 500;
            color: var(--cyan);
            background: rgba(49, 229, 197, 0.1);
            border: 1px solid rgba(49, 229, 197, 0.22);
            border-radius: 999px;
            padding: 2px 12px;
            letter-spacing: 0.02em;
        }

        .tag-hot {
            color: var(--gold);
            background: rgba(245, 199, 101, 0.1);
            border-color: rgba(245, 199, 101, 0.25);
        }

        .guide-body h3 {
            font-size: 22px;
            font-weight: 600;
            line-height: 1.4;
            margin-bottom: 12px;
        }

        .guide-body p {
            color: var(--text-2);
            font-size: 15px;
            line-height: 1.8;
            margin-bottom: 16px;
        }

        .text-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 14px;
            font-weight: 500;
            color: var(--primary);
            transition: color 0.25s ease, gap 0.25s ease;
        }

        .text-link:hover {
            color: var(--cyan);
            gap: 10px;
        }

        .text-link .arrow {
            font-size: 16px;
        }

        .guide-card-flip .guide-media {
            order: 2;
        }
        .guide-card-flip .guide-body {
            order: 1;
        }

        /* ===== 步骤区 ===== */
        .step-section {
            padding: var(--space-section) 0;
            background: var(--bg-2);
            border-top: 1px solid var(--line);
            border-bottom: 1px solid var(--line);
        }

        .steps-list {
            position: relative;
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            margin-top: 8px;
        }

        .steps-list::before {
            content: "";
            position: absolute;
            top: 36px;
            left: 8%;
            right: 8%;
            height: 2px;
            background: linear-gradient(90deg, var(--cyan), var(--primary), var(--pink));
            opacity: 0.45;
            border-radius: 2px;
            z-index: 0;
        }

        .step {
            position: relative;
            z-index: 1;
            text-align: center;
            padding: 0 12px;
        }

        .step-num {
            width: 56px;
            height: 56px;
            margin: 0 auto 16px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            font-weight: 700;
            background: var(--grad-main);
            color: #fff;
            box-shadow: 0 0 24px rgba(91, 127, 255, 0.35);
        }

        .step.done .step-num {
            background: var(--cyan);
            color: #06231c;
            box-shadow: 0 0 18px rgba(49, 229, 197, 0.3);
        }

        .step h3 {
            font-size: 17px;
            font-weight: 600;
            margin-bottom: 6px;
        }

        .step p {
            font-size: 13px;
            color: var(--text-2);
            line-height: 1.7;
        }

        .step-tip {
            margin-top: 40px;
            padding: 18px 22px;
            border-radius: 14px;
            background: rgba(91, 127, 255, 0.08);
            border: 1px solid rgba(91, 127, 255, 0.2);
            font-size: 14px;
            color: var(--text-2);
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .step-tip i {
            color: var(--gold);
            font-size: 18px;
        }

        /* ===== FAQ ===== */
        .faq-section {
            padding: var(--space-section) 0;
        }

        .faq-list {
            max-width: 860px;
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .faq-list .accordion-item {
            background: var(--bg-2);
            border: 1px solid var(--line);
            border-radius: 12px;
            overflow: hidden;
            transition: border-color 0.3s ease, box-shadow 0.3s ease;
        }

        .faq-list .accordion-item:hover {
            border-color: rgba(91, 127, 255, 0.3);
        }

        .faq-list .accordion-title {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 16px;
            font-weight: 600;
            color: var(--text);
            padding: 18px 22px;
            background: transparent;
            border: none;
            margin: 0;
            transition: color 0.25s ease;
        }

        .faq-list .accordion-title::after {
            content: "+";
            font-size: 22px;
            font-weight: 400;
            color: var(--text-3);
            line-height: 1;
            transition: transform 0.3s ease, color 0.3s ease;
        }

        .faq-list .accordion-item.is-active .accordion-title::after {
            content: "×";
            color: var(--cyan);
            transform: rotate(90deg);
        }

        .faq-list .accordion-content {
            padding: 0 22px 20px;
            font-size: 14px;
            color: var(--text-2);
            line-height: 1.8;
            border-top: none;
            background: transparent;
        }

        .faq-list .accordion-content p {
            margin-bottom: 0;
        }

        /* ===== CTA ===== */
        .cta-section {
            padding: var(--space-section) 0;
        }

        .cta-card {
            position: relative;
            text-align: center;
            padding: clamp(40px, 6vw, 72px) clamp(20px, 5vw, 64px);
            border-radius: 28px;
            background-image: linear-gradient(180deg, rgba(11, 16, 32, 0.65), #0B1020 95%), url('/assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center;
            border: 1px solid var(--line);
            overflow: hidden;
            box-shadow: var(--shadow-card);
        }

        .cta-card::before {
            content: "";
            position: absolute;
            top: -50%;
            left: 50%;
            transform: translateX(-50%);
            width: 420px;
            height: 420px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(138, 92, 255, 0.24), transparent 65%);
            pointer-events: none;
        }

        .cta-card h2 {
            position: relative;
            font-size: clamp(24px, 3.6vw, 38px);
            font-weight: 700;
            margin-bottom: 12px;
        }

        .cta-card p {
            position: relative;
            color: var(--text-2);
            font-size: 16px;
            margin-bottom: 30px;
        }

        .btn {
            position: relative;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 600;
            padding: 14px 28px;
            transition: transform 0.25s ease, box-shadow 0.25s ease, filter 0.25s ease, background 0.25s ease;
            border: none;
        }

        .btn-primary {
            background: var(--grad-main);
            color: #fff;
            box-shadow: 0 6px 20px rgba(91, 127, 255, 0.35);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            filter: brightness(1.08);
            color: #fff;
            box-shadow: 0 10px 32px rgba(91, 127, 255, 0.5);
        }

        .btn-lg {
            padding: 18px 48px;
            font-size: 18px;
            border-radius: 14px;
        }

        .cta-sub {
            margin-top: 16px;
            font-size: 13px;
            color: var(--text-3);
            margin-bottom: 0 !important;
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: #0A0F1D;
            border-top: 1px solid var(--line);
            padding: 48px 0 28px;
        }

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

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1.2fr;
            gap: 36px;
            margin-bottom: 28px;
        }

        .footer-brand .brand {
            margin-bottom: 10px;
        }

        .footer-brand p {
            color: var(--text-3);
            font-size: 14px;
            line-height: 1.7;
        }

        .footer-title {
            font-size: 14px;
            font-weight: 600;
            color: var(--text);
            margin-bottom: 12px;
        }

        .footer-nav {
            display: flex;
            flex-direction: column;
            gap: 6px;
        }

        .footer-nav a {
            color: var(--text-2);
            font-size: 14px;
            transition: color 0.25s ease;
        }

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

        .footer-meta {
            color: var(--text-3);
            font-size: 13px;
            line-height: 1.7;
            margin-bottom: 4px;
        }

        .copyright {
            border-top: 1px solid var(--line);
            padding-top: 20px;
            text-align: center;
            color: var(--text-3);
            font-size: 13px;
        }

        /* ===== 动画 ===== */
        .reveal {
            opacity: 0;
            transform: translateY(24px);
            transition: opacity 0.6s ease, transform 0.6s ease;
        }

        .reveal.visible {
            opacity: 1;
            transform: translateY(0);
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .side-nav {
                width: 200px;
            }

            .page-main {
                width: calc(100% - 200px);
                margin-left: 200px;
            }

            .steps-list {
                grid-template-columns: repeat(2, 1fr);
                gap: 32px 20px;
            }

            .steps-list::before {
                display: none;
            }
        }

        @media (max-width: 768px) {
            .guide-card {
                grid-template-columns: 1fr;
            }

            .guide-card-flip .guide-media {
                order: 0;
            }
            .guide-card-flip .guide-body {
                order: 0;
            }

            .guide-media {
                min-height: 200px;
            }

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

        @media (max-width: 640px) {
            .mobile-topbar {
                display: flex;
            }

            .side-nav {
                transform: translateX(-100%);
                transition: transform 0.3s ease;
                width: 260px;
                box-shadow: 6px 0 30px rgba(0, 0, 0, 0.4);
            }

            .side-nav.is-open {
                transform: translateX(0);
            }

            .nav-close {
                display: block;
            }

            .nav-overlay.show {
                display: block;
            }

            .page-main {
                width: 100%;
                margin-left: 0;
                padding-top: 56px;
            }

            .container {
                padding-left: 16px;
                padding-right: 16px;
            }

            .category-hero {
                padding-top: 56px;
            }

            .category-hero h1 {
                font-size: 32px;
            }

            .hero-badges {
                flex-direction: column;
                align-items: flex-start;
            }

            .guide-body {
                padding: 22px 18px;
            }

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

            .step {
                text-align: left;
                display: flex;
                gap: 16px;
                align-items: flex-start;
                padding: 0;
            }

            .step-num {
                margin: 0;
                width: 44px;
                height: 44px;
                font-size: 16px;
                flex-shrink: 0;
            }

            .step h3 {
                margin-bottom: 4px;
            }

            .step p {
                font-size: 13px;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
                margin-bottom: 20px;
            }

            .btn-lg {
                width: 100%;
                justify-content: center;
                padding: 16px 30px;
            }

            .cta-card {
                padding: 40px 18px;
            }

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

/* roulang page: article */
:root{
  --bg-deep:#0B1020;--bg-panel:#111830;--bg-panel2:#16203A;--bg-nav:#0D1424;
  --text-main:#EDF1FB;--text-secondary:#A6B0D4;--text-muted:#6C769A;
  --border:rgba(255,255,255,0.08);
  --grad:linear-gradient(135deg,#5B7FFF,#8A5CFF);
  --grad2:linear-gradient(120deg,#31E5C5,#5B7FFF,#C86BFF);
  --accent:#31E5C5;--blue:#5B7FFF;--purple:#8A5CFF;--gold:#F5C765;
  --radius-lg:20px;--radius-md:16px;--radius-sm:10px;
  --shadow-card:0 10px 30px rgba(0,0,0,0.3);
  --shadow-hover:0 16px 40px rgba(90,60,255,0.18),0 4px 12px rgba(0,0,0,0.3);
  --font-sans:system-ui,-apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC",sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:var(--font-sans);
  background:
    radial-gradient(circle at 15% 10%,rgba(91,127,255,.10),transparent 38%),
    radial-gradient(circle at 95% 80%,rgba(200,107,255,.06),transparent 30%),
    var(--bg-deep);
  color:var(--text-main);line-height:1.8;
  -webkit-font-smoothing:antialiased;
  background-attachment:fixed;
}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
button{font-family:inherit}
h1,h2,h3,h4{font-weight:700;line-height:1.3}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}

.mobile-header{
  display:none;position:fixed;top:0;left:0;right:0;z-index:1200;
  height:56px;align-items:center;justify-content:space-between;
  padding:0 16px;background:var(--bg-nav);border-bottom:1px solid var(--border);
}
.mobile-header .brand{display:flex;align-items:center;gap:8px}
.menu-toggle{
  display:inline-flex;align-items:center;justify-content:center;
  width:40px;height:40px;background:rgba(255,255,255,.06);
  border:1px solid var(--border);border-radius:10px;
  color:var(--text-main);font-size:20px;cursor:pointer;transition:.25s;
}
.menu-toggle:hover{background:rgba(91,127,255,.15);border-color:rgba(91,127,255,.4)}

.side-nav{
  position:fixed;top:0;left:0;width:240px;height:100vh;z-index:1100;
  background:linear-gradient(180deg,#0D1424 0%,#111830 100%);
  border-right:1px solid var(--border);
  display:flex;flex-direction:column;gap:6px;padding:28px 18px;
  overflow-y:auto;
}
.side-nav .brand{
  display:flex;align-items:center;gap:10px;padding:0 8px 24px;
}
.brand-mark{font-size:26px;color:var(--accent);text-shadow:0 0 14px rgba(49,229,197,.5)}
.brand-text{
  font-size:20px;font-weight:800;letter-spacing:.02em;
  background:var(--grad2);-webkit-background-clip:text;background-clip:text;color:transparent;
}
.side-close{
  display:none;
}
.side-nav > a{
  display:flex;align-items:center;gap:8px;
  padding:10px 14px;border-radius:10px;
  color:var(--text-secondary);font-size:15px;font-weight:500;
  transition:background .25s ease,color .25s ease,transform .2s ease;
}
.side-nav > a:hover:not(.brand):not(.side-mini-cta){
  background:rgba(91,127,255,.12);color:#fff;
}
.side-nav > a.active:not(.brand):not(.side-mini-cta){
  background:rgba(91,127,255,.12);color:#fff;font-weight:600;
}
.side-nav > a.active:not(.brand):not(.side-mini-cta)::before{
  content:'';position:absolute;left:-18px;top:10px;bottom:10px;width:3px;
  background:var(--grad);border-radius:0 4px 4px 0;
}
.side-tip{
  margin-top:auto;padding:14px 14px;
  background:rgba(49,229,197,.07);
  border:1px solid rgba(49,229,197,.18);
  border-radius:12px;display:flex;align-items:center;gap:10px;
  font-size:12px;color:var(--accent);line-height:1.5;
}
.tip-dot{width:6px;height:6px;background:var(--accent);border-radius:50%;box-shadow:0 0 8px var(--accent);flex-shrink:0}
.side-mini-cta{
  display:flex;align-items:center;justify-content:center;
  margin-top:12px;padding:10px 14px;
  background:var(--grad);color:#fff;border-radius:10px;
  font-size:14px;font-weight:600;transition:transform .25s ease,box-shadow .25s ease;
}
.side-mini-cta:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(91,127,255,.35)}

.page-main{flex:1;margin-left:240px;min-width:0;display:flex;flex-direction:column}
.article-wrap{
  flex:1;width:100%;max-width:960px;margin:0 auto;
  padding:48px 24px 64px;
}

.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-size:14px;color:var(--text-muted);margin-bottom:24px;
}
.breadcrumb a{color:var(--text-secondary);transition:color .2s}
.breadcrumb a:hover{color:var(--accent)}
.breadcrumb .sep{color:var(--text-muted)}
.breadcrumb .current{color:var(--text-muted);max-width:260px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

.article-header{margin-bottom:32px}
.article-category-pill{
  display:inline-block;padding:4px 16px;
  background:rgba(91,127,255,.12);border:1px solid rgba(91,127,255,.3);
  color:var(--blue);border-radius:999px;
  font-size:12px;font-weight:600;letter-spacing:.04em;
}
.article-title{
  font-size:clamp(30px,4vw,42px);font-weight:800;line-height:1.3;
  margin:16px 0 14px;color:var(--text-main);text-wrap:balance;
}
.article-meta{
  display:flex;flex-wrap:wrap;gap:18px;
  font-size:13px;color:var(--text-secondary);
}
.article-meta .meta-item{display:inline-flex;align-items:center;gap:6px}
.article-meta svg{width:14px;height:14px;color:var(--accent);flex-shrink:0}

.article-cover{
  margin-bottom:40px;border-radius:var(--radius-lg);overflow:hidden;
  border:1px solid var(--border);background:var(--bg-panel);
  box-shadow:var(--shadow-card);
}
.article-cover img{width:100%;height:auto;object-fit:cover;aspect-ratio:16/9}

.article-content{
  max-width:760px;margin:0 auto;
  font-size:16px;line-height:1.9;color:var(--text-secondary);
}
.article-content p{margin-bottom:24px}
.article-content h2{
  font-size:24px;color:var(--text-main);margin:40px 0 16px;font-weight:700;
  position:relative;padding-left:14px;
}
.article-content h2::before{
  content:'';position:absolute;left:0;top:6px;bottom:6px;width:4px;
  background:var(--grad);border-radius:2px;
}
.article-content h3{font-size:20px;color:var(--text-main);margin:36px 0 12px;font-weight:600}
.article-content h4{font-size:18px;color:var(--text-main);margin:28px 0 10px}
.article-content img{border-radius:16px;margin:24px 0;border:1px solid var(--border)}
.article-content ul,.article-content ol{padding-left:24px;margin-bottom:24px}
.article-content li{margin-bottom:8px}
.article-content a{color:var(--blue);border-bottom:1px solid rgba(91,127,255,.4);transition:color .2s,border-color .2s}
.article-content a:hover{color:var(--accent);border-color:var(--accent)}
.article-content blockquote{
  border-left:3px solid var(--accent);background:rgba(49,229,197,.06);
  padding:16px 20px;border-radius:0 10px 10px 0;margin:24px 0;color:var(--text-secondary);
}
.article-content pre{
  background:var(--bg-panel2);border-radius:12px;padding:20px;overflow:auto;
  border:1px solid var(--border);margin:24px 0;font-size:14px;line-height:1.7;
}
.article-content code{
  background:var(--bg-panel2);padding:2px 8px;border-radius:6px;font-size:14px;
  font-family:ui-monospace,SFMono-Regular,Consolas,monospace;
}
.article-content table{width:100%;border-collapse:collapse;margin:24px 0;font-size:14px}
.article-content th,.article-content td{border:1px solid var(--border);padding:10px 14px;text-align:left}
.article-content th{background:var(--bg-panel2);color:var(--text-main);font-weight:600}
.article-content hr{border:none;border-top:1px solid var(--border);margin:32px 0}

.article-tags{
  max-width:760px;margin:40px auto 48px;display:flex;flex-wrap:wrap;gap:10px;
}
.tag{
  padding:6px 16px;background:var(--bg-panel);
  border:1px solid var(--border);border-radius:999px;
  font-size:13px;color:var(--text-secondary);transition:.25s;
}
.tag:hover{border-color:var(--accent);color:var(--accent)}

.related-posts{border-top:1px solid var(--border);padding-top:40px;margin-bottom:48px}
.related-title{
  font-size:24px;font-weight:700;margin-bottom:24px;color:var(--text-main);
  display:flex;align-items:center;gap:10px;
}
.related-title::before{
  content:'';width:4px;height:22px;background:var(--grad);border-radius:2px;
}
.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.related-card{
  display:block;background:var(--bg-panel);border:1px solid var(--border);
  border-radius:var(--radius-md);overflow:hidden;transition:.3s;
}
.related-card:hover{
  transform:translateY(-4px);box-shadow:var(--shadow-hover);border-color:rgba(91,127,255,.4);
}
.related-card img{
  width:100%;height:140px;object-fit:cover;transition:transform .3s ease;
}
.related-card:hover img{transform:scale(1.03)}
.related-info{padding:16px 16px 18px}
.related-info h3{font-size:15px;font-weight:600;color:var(--text-main);margin-bottom:10px;line-height:1.45}
.related-info .related-date{font-size:12px;color:var(--text-muted)}

.back-link{max-width:760px;margin:0 auto;text-align:center}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  border-radius:var(--radius-sm);font-size:15px;font-weight:600;
  transition:all .25s ease;cursor:pointer;text-decoration:none;
}
.btn-primary{
  background:var(--grad);color:#fff;padding:14px 28px;
  box-shadow:0 6px 20px rgba(91,127,255,.35);
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 10px 28px rgba(91,127,255,.45);}
.btn-outline{
  background:transparent;color:var(--text-secondary);
  border:1.5px solid var(--blue);padding:10px 24px;
}
.btn-outline:hover{background:rgba(91,127,255,.12);color:#fff}

.article-empty{
  text-align:center;padding:80px 24px;
  background:var(--bg-panel);border-radius:var(--radius-lg);
  border:1px dashed var(--border);
}
.article-empty p{font-size:18px;color:var(--text-secondary);margin-bottom:20px}
.article-empty .btn{margin-top:8px}

.site-footer{
  background:#0A0F1D;border-top:1px solid var(--border);
  padding:48px 24px 32px;width:100%;
}
.site-footer .container{max-width:1200px;margin:0 auto}
.footer-grid{
  display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:40px;margin-bottom:32px;
}
.footer-brand .brand{display:inline-flex;align-items:center;gap:8px;margin-bottom:12px}
.footer-brand p{font-size:14px;color:var(--text-muted);line-height:1.6}
.footer-title{
  font-size:14px;font-weight:600;color:var(--text-main);margin-bottom:12px;letter-spacing:.04em;
}
.footer-nav{display:flex;flex-direction:column;gap:8px}
.footer-nav a{font-size:14px;color:var(--text-secondary);transition:color .2s,padding-left .2s}
.footer-nav a:hover{color:var(--accent);padding-left:4px}
.footer-meta{font-size:13px;color:var(--text-muted);margin-bottom:6px}
.copyright{
  border-top:1px solid var(--border);padding-top:20px;
  font-size:12px;color:var(--text-muted);text-align:center;
}

@media (max-width:1024px) and (min-width:641px){
  .side-nav{width:200px;padding:20px 14px}
  .page-main{margin-left:200px}
  .brand-text{font-size:18px}
  .side-nav > a{font-size:14px;padding:9px 12px}
  .article-wrap{padding:36px 20px 56px}
}

@media (max-width:640px){
  .mobile-header{display:flex}
  .side-nav{
    transform:translateX(-100%);width:280px;padding:24px 18px;
    transition:transform .3s ease;box-shadow:none;
  }
  .side-nav.open{
    transform:translateX(0);box-shadow:0 0 60px rgba(0,0,0,.6);
  }
  .side-close{
    display:inline-flex;align-items:center;justify-content:center;
    position:absolute;top:18px;right:16px;width:32px;height:32px;
    background:rgba(255,255,255,.06);border:1px solid var(--border);
    color:var(--text-secondary);border-radius:8px;font-size:20px;cursor:pointer;
    z-index:10;transition:.2s;
  }
  .side-close:hover{color:var(--accent);border-color:var(--accent)}
  .page-main{margin-left:0}
  .article-wrap{padding:28px 16px 48px;padding-top:72px}
  .breadcrumb{font-size:13px;margin-bottom:18px}
  .article-title{font-size:clamp(26px,7vw,32px)}
  .article-meta{flex-direction:column;gap:10px}
  .article-cover{border-radius:16px}
  .article-content{font-size:15px}
  .article-content h2{font-size:22px}
  .related-grid{grid-template-columns:1fr 1fr}
  .related-card img{height:110px}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .article-empty{padding:56px 20px}
}

@media (max-width:420px){
  .related-grid{grid-template-columns:1fr}
}

/* roulang page: category2 */
:root {
    --bg-deep: #0B1020;
    --bg-secondary: #111830;
    --bg-tertiary: #16203A;
    --bg-panel: #0D1424;
    --primary: #5B7FFF;
    --primary-2: #8A5CFF;
    --primary-3: #C86BFF;
    --accent: #31E5C5;
    --gold: #F5C765;
    --text-main: #EDF1FB;
    --text-secondary: #A6B0D4;
    --text-muted: #6C769A;
    --border: rgba(255,255,255,0.08);
    --radius-lg: 20px;
    --radius-md: 16px;
    --radius-sm: 10px;
    --shadow-card: 0 10px 30px rgba(0,0,0,0.3);
    --shadow-hover: 0 16px 40px rgba(90,60,255,0.18), 0 4px 12px rgba(0,0,0,0.3);
    --shadow-btn: 0 6px 20px rgba(91,127,255,0.35);
    --gradient-brand: linear-gradient(120deg, #31E5C5, #5B7FFF, #C86BFF);
    --gradient-btn: linear-gradient(135deg, #5B7FFF, #8A5CFF);
    --font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
    --section-space: clamp(64px, 10vw, 110px);
  }

  *, *::before, *::after { box-sizing: border-box; }
  html { scroll-behavior: smooth; }

  body {
    margin: 0;
    background: var(--bg-deep);
    color: var(--text-main);
    font-family: var(--font-family);
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
  }

  img { max-width: 100%; height: auto; display: block; }
  a { color: var(--primary); text-decoration: none; }
  a:hover { color: var(--primary-3); }

  h1, h2, h3, h4, p { margin-top: 0; }
  h1 { font-size: clamp(34px, 5vw, 56px); font-weight: 800; line-height: 1.2; text-wrap: balance; margin-bottom: 20px; }
  h2 { font-size: clamp(26px, 3.5vw, 38px); font-weight: 700; line-height: 1.3; margin-bottom: 18px; }
  h3 { font-size: 22px; font-weight: 600; line-height: 1.4; margin-bottom: 12px; }

  :focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
    border-radius: 6px;
  }

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

  .gradient-text {
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }

  .main-content {
    min-height: 100vh;
    margin-left: 240px;
    background:
      radial-gradient(ellipse at 78% -5%, rgba(91,127,255,0.12), transparent 55%),
      radial-gradient(ellipse at 85% 45%, rgba(138,92,255,0.06), transparent 50%),
      var(--bg-deep);
  }

  /* ========== Header / Side Nav ========== */
  .site-header {
    position: fixed;
    left: 0;
    top: 0;
    width: 240px;
    height: 100vh;
    background: #0D1424;
    border-right: 1px solid var(--border);
    z-index: 100;
  }

  .side-nav-panel {
    display: flex;
    flex-direction: column;
    height: 100%;
    padding: 24px 16px;
    background:
      radial-gradient(ellipse at 20% 0%, rgba(91,127,255,0.08), transparent 50%),
      #0D1424;
  }

  .brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--text-main);
    font-weight: 700;
    font-size: 20px;
    padding: 4px 6px 20px;
  }
  .brand:hover { color: var(--text-main); }

  .brand-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: var(--gradient-btn);
    color: #fff;
    font-size: 18px;
    box-shadow: var(--shadow-btn);
    flex-shrink: 0;
  }

  .brand-text { letter-spacing: .02em; }

  .side-nav {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-top: 8px;
  }

  .side-nav a {
    position: relative;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 14px;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 15px;
    font-weight: 500;
    transition: background .25s ease, color .25s ease;
  }

  .side-nav a:hover {
    background: rgba(91,127,255,0.12);
    color: #fff;
  }

  .side-nav a.active {
    background: rgba(91,127,255,0.12);
    color: #fff;
  }

  .side-nav a.active::before {
    content: "";
    position: absolute;
    left: 0;
    top: 10px;
    bottom: 10px;
    width: 3px;
    border-radius: 3px;
    background: var(--gradient-brand);
  }

  .night-status {
    margin-top: auto;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 14px;
    background: rgba(49,229,197,0.06);
    border: 1px solid rgba(49,229,197,0.18);
    border-radius: 12px;
    font-size: 13px;
    color: var(--text-secondary);
  }

  .status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 8px var(--accent);
    flex-shrink: 0;
  }

  .side-cta {
    display: block;
    margin-top: 12px;
    padding: 12px 14px;
    text-align: center;
    border-radius: var(--radius-sm);
    background: var(--gradient-btn);
    color: #fff;
    font-weight: 600;
    font-size: 14px;
    box-shadow: var(--shadow-btn);
    transition: transform .25s ease, box-shadow .25s ease, filter .25s ease;
  }
  .side-cta:hover {
    transform: translateY(-2px);
    color: #fff;
    box-shadow: 0 10px 28px rgba(91,127,255,0.45);
    filter: brightness(1.08);
  }

  .mobile-topbar {
    display: none;
    height: 56px;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    background: #0D1424;
    border-bottom: 1px solid rgba(255,255,255,0.08);
  }

  .mobile-topbar .brand { padding: 0; font-size: 18px; }
  .mobile-topbar .brand-mark { width: 32px; height: 32px; font-size: 15px; }

  .menu-toggle {
    background: none;
    border: none;
    color: var(--text-main);
    font-size: 22px;
    cursor: pointer;
    padding: 8px;
    line-height: 1;
  }

  .drawer-head {
    display: none;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
  }
  .mobile-drawer { display: none; }

  /* ========== Buttons ========== */
  .btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 28px;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    border: 0;
    cursor: pointer;
    transition: transform .25s ease, box-shadow .25s ease, background .25s ease, color .25s ease, border-color .25s ease, filter .25s ease;
  }
  .btn i { font-size: 14px; }

  .btn-primary {
    background: var(--gradient-btn);
    color: #fff;
    box-shadow: var(--shadow-btn);
  }
  .btn-primary:hover {
    transform: translateY(-2px);
    background: linear-gradient(135deg, #6f8cff, #9a70ff);
    color: #fff;
    box-shadow: 0 10px 28px rgba(91,127,255,0.45);
  }

  .btn-outline {
    background: transparent;
    border: 1.5px solid var(--primary);
    color: var(--text-secondary);
  }
  .btn-outline:hover {
    background: rgba(91,127,255,0.12);
    color: #fff;
    border-color: var(--primary-2);
    transform: translateY(-2px);
  }

  .btn-lg {
    padding: 18px 48px;
    font-size: 18px;
  }

  .text-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--primary);
    font-weight: 600;
    font-size: 15px;
    transition: color .25s ease;
  }
  .text-link:hover {
    color: var(--primary-3);
    text-decoration: underline;
  }

  /* ========== Hero ========== */
  .page-hero {
    position: relative;
    padding: clamp(60px, 9vw, 120px) 0 80px;
    background:
      linear-gradient(180deg, rgba(11,16,32,0.4) 0%, #0B1020 92%),
      url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
    border-bottom: 1px solid rgba(255,255,255,0.06);
  }

  .hero-inner { max-width: 680px; }

  .eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    border-radius: 999px;
    background: rgba(49,229,197,0.1);
    border: 1px solid rgba(49,229,197,0.25);
    color: var(--accent);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: .06em;
    margin-bottom: 20px;
  }

  .hero-sub {
    font-size: clamp(16px, 2vw, 19px);
    color: var(--text-secondary);
    max-width: 560px;
    margin-bottom: 32px;
  }

  .hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-bottom: 40px;
  }

  .hero-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
  }

  .stat-badge {
    display: inline-flex;
    align-items: baseline;
    gap: 6px;
    padding: 8px 16px;
    border-radius: 999px;
    background: rgba(49,229,197,0.08);
    border: 1px solid rgba(49,229,197,0.18);
    color: var(--text-secondary);
    font-size: 13px;
  }
  .stat-badge strong {
    color: var(--accent);
    font-weight: 600;
    font-size: clamp(18px, 2.4vw, 24px);
    line-height: 1;
  }

  /* ========== Sections ========== */
  .section {
    padding: var(--section-space) 0;
    position: relative;
  }

  .section-head {
    max-width: 760px;
    margin-bottom: 48px;
  }

  .kicker {
    display: inline-block;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: .1em;
    color: var(--accent);
    margin-bottom: 12px;
  }

  .section-desc {
    color: var(--text-secondary);
    font-size: 16px;
    margin-bottom: 0;
  }

  /* ========== Scope ========== */
  .section-scope {
    background: linear-gradient(180deg, transparent, rgba(17,24,48,0.35));
  }

  .scope-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
  }

  .scope-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 24px;
    transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
  }
  .scope-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: rgba(91,127,255,0.35);
  }

  .scope-card i {
    font-size: 22px;
    color: var(--primary-3);
    margin-bottom: 14px;
  }
  .scope-card h3 { font-size: 18px; margin-bottom: 10px; }
  .scope-card p { font-size: 14px; color: var(--text-secondary); margin-bottom: 0; }

  /* ========== Topics ========== */
  .topic-row {
    display: grid;
    grid-template-columns: 1.05fr 1fr;
    gap: 48px;
    align-items: center;
    margin-bottom: 56px;
  }
  .topic-row:last-child { margin-bottom: 0; }
  .topic-row.reverse .topic-media { order: 2; }
  .topic-row.reverse .topic-body { order: 1; }

  .topic-media {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-card);
  }
  .topic-media::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 55%, rgba(17,24,48,0.85));
    pointer-events: none;
  }
  .topic-media img {
    width: 100%;
    height: 280px;
    object-fit: cover;
    transition: transform .6s ease;
  }
  .topic-row:hover .topic-media img { transform: scale(1.03); }

  .topic-body { padding: 12px 0; }
  .topic-body h3 { font-size: 24px; margin-bottom: 14px; }
  .topic-body p { color: var(--text-secondary); margin-bottom: 20px; }

  /* ========== Data Strip ========== */
  .section-data {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
  }

  .data-strip {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
  }

  .data-item {
    background: rgba(11,16,32,0.5);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 28px 20px;
    text-align: center;
    transition: box-shadow .25s ease, border-color .25s ease;
  }
  .data-item:hover {
    box-shadow: var(--shadow-hover);
    border-color: rgba(49,229,197,0.3);
  }
  .data-item strong {
    display: block;
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 700;
    line-height: 1.2;
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }
  .data-item span {
    display: block;
    margin-top: 6px;
    font-size: 13px;
    color: var(--text-muted);
  }

  /* ========== Scenario ========== */
  .scenario-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }

  .scenario-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 28px;
    transition: transform .25s ease, box-shadow .25s ease;
  }
  .scenario-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
  }
  .scenario-icon {
    font-size: 28px;
    color: var(--accent);
    margin-bottom: 16px;
  }
  .scenario-card h3 { font-size: 19px; margin-bottom: 10px; }
  .scenario-card p { color: var(--text-secondary); font-size: 15px; margin-bottom: 0; }

  /* ========== Steps ========== */
  .section-steps {
    background:
      radial-gradient(ellipse at 50% 100%, rgba(138,92,255,0.1), transparent 55%),
      var(--bg-deep);
  }

  .steps-track {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    position: relative;
  }
  .steps-track::before {
    content: "";
    position: absolute;
    top: 22px;
    left: 10%;
    right: 10%;
    height: 2px;
    background: linear-gradient(90deg, var(--accent), var(--primary-3));
    opacity: 0.35;
    border-radius: 2px;
  }

  .step-item {
    position: relative;
    padding: 24px 20px;
    background: rgba(17,24,48,0.7);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    transition: box-shadow .25s ease, transform .25s ease;
  }
  .step-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
  }

  .step-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--gradient-btn);
    color: #fff;
    font-weight: 700;
    font-size: 18px;
    box-shadow: var(--shadow-btn);
    margin-bottom: 14px;
    position: relative;
    z-index: 1;
  }
  .step-item h3 { font-size: 17px; margin-bottom: 8px; }
  .step-item p { font-size: 14px; color: var(--text-secondary); margin-bottom: 0; }

  /* ========== FAQ ========== */
  .section-faq {
    background: linear-gradient(180deg, transparent, rgba(11,16,32,0.6));
  }

  .accordion {
    max-width: 860px;
    margin: 0 auto;
    list-style: none;
    background: transparent;
    border: none;
  }
  .accordion-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    margin-bottom: 12px;
    overflow: hidden;
    transition: box-shadow .25s ease, border-color .25s ease;
  }
  .accordion-item.is-active {
    box-shadow: 0 16px 40px rgba(90,60,255,0.14);
    border-color: rgba(91,127,255,0.35);
  }

  .accordion-title {
    position: relative;
    display: block;
    padding: 18px 48px 18px 22px;
    background: transparent;
    border: none;
    color: var(--text-main);
    font-size: 16px;
    font-weight: 600;
    line-height: 1.5;
    transition: background .25s ease, color .25s ease;
  }
  .accordion-title:hover,
  .accordion-title:focus {
    background: rgba(91,127,255,0.08);
    color: #fff;
  }
  .accordion-title::before,
  .accordion-title::after {
    content: "+";
    position: absolute;
    right: 22px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 22px;
    font-weight: 400;
    color: var(--primary);
    transition: opacity .25s ease;
  }
  .accordion-title::after {
    content: "×";
    opacity: 0;
  }
  .accordion-item.is-active .accordion-title::before { opacity: 0; }
  .accordion-item.is-active .accordion-title::after { opacity: 1; }

  .accordion-content {
    background: transparent;
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.8;
    padding: 0 22px 20px;
    border: none;
  }
  .accordion-content p { margin-bottom: 0; }

  /* ========== CTA ========== */
  .section-cta { padding-bottom: clamp(64px, 10vw, 110px); }

  .cta-card {
    position: relative;
    padding: clamp(48px, 7vw, 80px) 40px;
    text-align: center;
    border-radius: 24px;
    background:
      radial-gradient(ellipse at 50% 0%, rgba(138,92,255,0.28), transparent 60%),
      linear-gradient(180deg, rgba(11,16,32,0.82), rgba(11,16,32,0.92)),
      url('/assets/images/backpic/back-3.webp') center/cover no-repeat;
    border: 1px solid rgba(255,255,255,0.08);
    box-shadow: 0 20px 60px rgba(0,0,0,0.45);
    overflow: hidden;
  }
  .cta-card h2 {
    font-size: clamp(24px, 3.5vw, 36px);
    margin-bottom: 24px;
  }
  .cta-card .btn { margin-top: 8px; }
  .cta-note {
    margin-top: 16px;
    color: var(--text-muted);
    font-size: 14px;
  }

  /* ========== Footer ========== */
  .site-footer {
    margin-left: 240px;
    background: #0A0F1D;
    border-top: 1px solid var(--border);
    padding: 48px 0 24px;
  }

  .footer-grid {
    display: grid;
    grid-template-columns: 1.6fr 1fr 1fr;
    gap: 40px;
  }
  .footer-brand .brand { padding: 0; margin-bottom: 12px; font-size: 18px; }
  .footer-brand .brand-mark { width: 32px; height: 32px; font-size: 15px; }
  .footer-brand p { color: var(--text-secondary); font-size: 14px; margin-bottom: 0; }

  .footer-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 12px;
  }

  .footer-nav {
    display: flex;
    flex-direction: column;
    gap: 8px;
  }
  .footer-nav a {
    color: var(--text-secondary);
    font-size: 14px;
    transition: color .25s ease;
  }
  .footer-nav a:hover { color: var(--accent); }

  .footer-meta {
    color: var(--text-muted);
    font-size: 14px;
    margin-bottom: 6px;
  }

  .copyright {
    border-top: 1px solid rgba(255,255,255,0.06);
    margin-top: 40px;
    padding-top: 20px;
    font-size: 13px;
    color: var(--text-muted);
    text-align: center;
  }

  /* ========== Responsive ========== */
  @media (max-width: 1024px) {
    .site-header { width: 200px; }
    .main-content { margin-left: 200px; }
    .site-footer { margin-left: 200px; }
    .scope-grid,
    .data-strip { grid-template-columns: repeat(2, 1fr); }
    .scenario-grid { grid-template-columns: repeat(2, 1fr); }
    .steps-track { grid-template-columns: repeat(2, 1fr); }
    .steps-track::before { display: none; }
    .topic-row { gap: 32px; }
  }

  @media (max-width: 640px) {
    .container { padding: 0 16px; }

    .site-header {
      width: 100%;
      height: 56px;
      border-right: none;
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    .side-nav-panel { display: none; }
    .mobile-topbar { display: flex; }
    .drawer-head { display: flex; }
    .mobile-drawer {
      display: block;
      position: fixed;
      top: 0;
      left: 0;
      width: min(82vw, 320px);
      height: 100vh;
      background: #0D1424;
      z-index: 200;
      padding: 24px 16px;
      transform: translateX(-105%);
      transition: transform .3s ease;
      border-right: 1px solid rgba(255,255,255,0.08);
      overflow-y: auto;
    }
    .mobile-drawer.is-open {
      transform: translateX(0);
      box-shadow: 0 0 0 100vmax rgba(0,0,0,0.55);
    }
    .drawer-close {
      background: none;
      border: none;
      color: var(--text-muted);
      font-size: 26px;
      cursor: pointer;
      padding: 4px;
      line-height: 1;
    }
    .mobile-drawer .night-status { margin-top: 32px; }

    .main-content { margin-left: 0; padding-top: 56px; }
    .site-footer { margin-left: 0; padding: 40px 0 20px; }

    .section { padding: 56px 0; }
    .section-head { margin-bottom: 32px; }

    .scope-grid,
    .data-strip,
    .scenario-grid,
    .steps-track { grid-template-columns: 1fr; }

    .topic-row { grid-template-columns: 1fr; gap: 16px; margin-bottom: 40px; }
    .topic-row.reverse .topic-media { order: 0; }
    .topic-row.reverse .topic-body { order: 0; }
    .topic-media img { height: 200px; }
    .topic-body h3 { font-size: 21px; }

    .hero-actions { flex-direction: column; }
    .hero-actions .btn { justify-content: center; }
    .page-hero { padding-top: 56px; }

    .cta-card { padding: 40px 20px; }
    .btn-lg { padding: 16px 32px; font-size: 16px; }

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