/* roulang page: index */
/* ============ 设计变量 ============ */
:root {
  --bg-page: #0B1726;
  --bg-panel: #0F1F35;
  --ink-primary: #0A1628;
  --cyan: #00D4FF;
  --blue: #2E6BFF;
  --violet: #7A7CFF;
  --amber: #FFC351;
  --text-primary: #E8F0F8;
  --text-secondary: #9AB0C4;
  --text-muted: #647A8F;
  --border-glass: rgba(255, 255, 255, 0.08);
  --radius-hero: 20px;
  --radius-card: 16px;
  --radius-tag: 8px;
  --radius-pill: 999px;
  --shadow-card: 0 10px 30px rgba(0, 0, 0, 0.35);
  --shadow-glow: 0 0 24px rgba(0, 212, 255, 0.18);
  --font-body: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Roboto Mono", Consolas, monospace;
  --nav-h: 64px;
  --section-pad: 90px;
}

/* ============ Reset / Base ============ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-primary);
  background-color: var(--bg-page);
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.018) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.018) 1px, transparent 1px);
  background-size: 44px 44px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a {
  color: var(--cyan);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover { color: #4fe0ff; }

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

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

ul, ol { list-style: none; }

.container {
  width: min(1200px, calc(100% - 48px));
  margin: 0 auto;
}

.section {
  padding: var(--section-pad) 0;
  position: relative;
}

.section-head {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 56px;
}

.section-title {
  font-size: clamp(26px, 3.2vw, 36px);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 14px;
  letter-spacing: -0.02em;
}

.section-subtitle {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ============ 导航 ============ */
.site-nav {
  position: fixed;
  top: 14px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1000;
  width: min(1200px, calc(100% - 32px));
  padding: 8px 20px;
  border-radius: var(--radius-pill);
  background: rgba(9, 18, 34, 0.55);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.06);
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background 0.35s ease, box-shadow 0.35s ease, border-color 0.35s ease;
}

.site-nav.scrolled {
  background: rgba(9, 18, 34, 0.85);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-color: rgba(0, 212, 255, 0.12);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

.brand {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.02em;
  display: flex;
  align-items: center;
  gap: 10px;
  white-space: nowrap;
}

.brand::before {
  content: '';
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 14px rgba(0, 212, 255, 0.6);
  flex-shrink: 0;
}

.brand:hover { color: #fff; }

.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: background 0.25s ease, color 0.25s ease;
  white-space: nowrap;
}

.nav-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  transition: background 0.25s ease, box-shadow 0.25s ease;
}

.nav-link:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

.nav-link:hover .nav-dot {
  background: var(--cyan);
  box-shadow: 0 0 8px rgba(0, 212, 255, 0.5);
}

.nav-link.active {
  background: rgba(0, 212, 255, 0.14);
  color: var(--cyan);
}

.nav-link.active .nav-dot {
  background: var(--cyan);
  box-shadow: 0 0 8px rgba(0, 212, 255, 0.6);
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-primary);
  font-size: 18px;
  transition: background 0.25s ease;
}

.nav-toggle:hover {
  background: rgba(0, 212, 255, 0.1);
  border-color: rgba(0, 212, 255, 0.3);
}

/* ============ 按钮 ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  height: 50px;
  padding: 0 30px;
  border-radius: var(--radius-pill);
  font-size: 15px;
  font-weight: 600;
  transition: all 0.3s ease;
  white-space: nowrap;
  line-height: 1;
}

.btn-primary {
  background: linear-gradient(135deg, var(--cyan) 0%, var(--blue) 100%);
  color: #06101d;
  box-shadow: 0 4px 24px rgba(0, 212, 255, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 28px rgba(0, 212, 255, 0.45);
  color: #06101d;
  filter: brightness(1.08);
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: 0 2px 14px rgba(0, 212, 255, 0.3);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: var(--text-primary);
  backdrop-filter: blur(8px);
}

.btn-ghost:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(0, 212, 255, 0.06);
}

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

.btn-sm {
  height: 36px;
  padding: 0 18px;
  font-size: 13px;
}

/* ============ Hero ============ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 140px 24px 100px;
  background:
    radial-gradient(ellipse at 22% 28%, rgba(0, 212, 255, 0.16), transparent 55%),
    radial-gradient(ellipse at 82% 72%, rgba(46, 107, 255, 0.14), transparent 50%),
    linear-gradient(180deg, var(--ink-primary) 0%, var(--bg-page) 55%, var(--bg-panel) 100%);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url('/assets/images/backpic/back-1.webp') center / cover no-repeat;
  opacity: 0.28;
  z-index: 0;
}

.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, var(--bg-page) 0%, transparent 60%);
  z-index: 1;
}

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

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  border-radius: var(--radius-pill);
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid rgba(0, 212, 255, 0.2);
  color: var(--cyan);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.04em;
  margin-bottom: 28px;
}

.hero-badge::before {
  content: '';
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 10px rgba(0, 212, 255, 0.7);
}

.hero-title {
  font-size: clamp(30px, 5vw, 48px);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.025em;
  margin-bottom: 20px;
  color: #fff;
}

.hero-title .highlight {
  color: var(--cyan);
}

.hero-subtitle {
  font-size: clamp(15px, 2vw, 18px);
  color: var(--text-secondary);
  line-height: 1.75;
  max-width: 620px;
  margin: 0 auto 36px;
}

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

.hero-scroll {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  color: var(--text-muted);
  font-size: 20px;
  z-index: 2;
  animation: bounceDown 2s ease infinite;
}

@keyframes bounceDown {
  0%, 100% { transform: translate(-50%, 0); }
  50% { transform: translate(-50%, 8px); }
}

/* ============ 统计条 ============ */
.stats-bar {
  background: var(--bg-panel);
  border-block: 1px solid var(--border-glass);
  padding: 40px 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}

.stat-item {
  text-align: center;
  padding: 12px;
}

.stat-value {
  font-family: var(--font-mono);
  font-size: clamp(28px, 3.5vw, 40px);
  font-weight: 700;
  color: var(--cyan);
  line-height: 1.2;
  font-variant-numeric: tabular-nums;
}

.stat-label {
  font-size: 14px;
  color: var(--text-secondary);
  margin-top: 6px;
}

/* ============ 平台介绍 ============ */
.feature-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  margin-bottom: 80px;
}

.feature-block:last-child {
  margin-bottom: 0;
}

.feature-block.reverse {
  direction: rtl;
}

.feature-block.reverse > * {
  direction: ltr;
}

.feature-content {
  padding: 20px 0;
}

.feature-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 500;
  color: var(--cyan);
  background: rgba(0, 212, 255, 0.08);
  padding: 4px 14px;
  border-radius: var(--radius-pill);
  margin-bottom: 18px;
}

.feature-title {
  font-size: clamp(24px, 2.8vw, 32px);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 16px;
  color: #fff;
}

.feature-text {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 24px;
}

.feature-points {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.feature-point {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 14px;
  color: var(--text-primary);
}

.feature-point i {
  color: var(--cyan);
  margin-top: 3px;
  font-size: 15px;
  flex-shrink: 0;
}

.feature-media {
  position: relative;
  border-radius: var(--radius-hero);
  overflow: hidden;
  border: 1px solid var(--border-glass);
  box-shadow: var(--shadow-card);
  aspect-ratio: 4 / 3;
}

.feature-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.feature-media:hover img {
  transform: scale(1.04);
}

.feature-media::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10, 22, 40, 0.1) 0%, rgba(10, 22, 40, 0.4) 100%);
}

.feature-media .img-caption {
  position: absolute;
  bottom: 16px;
  left: 16px;
  z-index: 2;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.9);
  background: rgba(10, 22, 40, 0.6);
  padding: 4px 14px;
  border-radius: var(--radius-pill);
  backdrop-filter: blur(6px);
}

/* ============ 奖励预览 ============ */
.rewards-section {
  background: var(--bg-panel);
  border-block: 1px solid var(--border-glass);
}

.rewards-scroll {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 24px;
  overflow-x: auto;
  padding: 8px 4px 24px;
  scrollbar-width: thin;
  scrollbar-color: rgba(0, 212, 255, 0.3) transparent;
}

.rewards-scroll::-webkit-scrollbar {
  height: 6px;
}

.rewards-scroll::-webkit-scrollbar-thumb {
  background: rgba(0, 212, 255, 0.3);
  border-radius: 4px;
}

.reward-card {
  position: relative;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: 20px;
  min-width: 210px;
  transition: transform 0.35s ease, border-color 0.35s ease, box-shadow 0.35s ease;
}

.reward-card::before {
  content: '';
  position: absolute;
  top: 18px;
  left: 18px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 12px rgba(0, 212, 255, 0.55);
}

.reward-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 212, 255, 0.4);
  box-shadow: 0 0 24px rgba(0, 212, 255, 0.15), var(--shadow-card);
}

.reward-img {
  width: 100%;
  height: 110px;
  border-radius: 12px;
  overflow: hidden;
  margin-bottom: 16px;
  background: linear-gradient(135deg, rgba(46, 107, 255, 0.2), rgba(0, 212, 255, 0.1));
}

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

.reward-badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: var(--radius-tag);
  font-size: 12px;
  font-weight: 600;
  background: rgba(255, 195, 81, 0.12);
  color: var(--amber);
  border: 1px solid rgba(255, 195, 81, 0.2);
  margin-bottom: 12px;
}

.reward-name {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.35;
}

.reward-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ============ 任务进度 ============ */
.timeline-wrap {
  max-width: 820px;
  margin: 0 auto;
}

.timeline {
  display: flex;
  flex-direction: column;
  position: relative;
  max-width: 680px;
  margin: 0 auto;
}

.timeline-step {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 32px 0;
  position: relative;
}

.timeline-step:not(:last-child)::after {
  content: '';
  position: absolute;
  left: 31px;
  top: 72px;
  bottom: -16px;
  width: 2px;
  background: linear-gradient(to bottom, rgba(0, 212, 255, 0.35), rgba(0, 212, 255, 0.08));
}

.step-dot {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
  border: 2px solid rgba(255, 255, 255, 0.15);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-muted);
  z-index: 2;
  transition: all 0.3s ease;
}

.timeline-step.completed .step-dot {
  background: rgba(0, 212, 255, 0.18);
  border-color: var(--cyan);
  color: var(--cyan);
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.2);
}

.timeline-step.active .step-dot {
  background: rgba(122, 124, 255, 0.16);
  border-color: var(--violet);
  color: var(--violet);
  box-shadow: 0 0 20px rgba(122, 124, 255, 0.2);
}

.step-content {
  flex: 1;
}

.step-status {
  font-size: 12px;
  color: var(--text-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 4px;
}

.timeline-step.completed .step-status {
  color: var(--cyan);
}

.timeline-step.active .step-status {
  color: var(--violet);
}

.step-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

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

.step-percent {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
  min-width: 52px;
  text-align: right;
  background: rgba(0, 212, 255, 0.08);
  padding: 4px 12px;
  border-radius: var(--radius-pill);
}

.timeline-step.active .step-percent {
  color: var(--violet);
  background: rgba(122, 124, 255, 0.1);
}

.timeline-step.pending .step-percent {
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.04);
}

/* ============ 最新信息 ============ */
.news-section {
  background: linear-gradient(180deg, var(--bg-page) 0%, rgba(15, 31, 53, 0.4) 100%);
}

.news-area {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 40px;
  align-items: start;
}

.news-list-card {
  display: flex;
  gap: 18px;
  padding: 18px;
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-card);
  margin-bottom: 18px;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.news-list-card:hover {
  border-color: rgba(0, 212, 255, 0.3);
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.08);
}

.news-thumb {
  width: 150px;
  height: 100px;
  flex-shrink: 0;
  border-radius: 10px;
  overflow: hidden;
  background: linear-gradient(135deg, rgba(46, 107, 255, 0.2), rgba(0, 212, 255, 0.08));
}

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

.news-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.news-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.4;
  margin-bottom: 8px;
  transition: color 0.25s ease;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.news-list-card:hover .news-title {
  color: var(--cyan);
}

.news-excerpt {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 12px;
  flex: 1;
}

.news-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.news-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 12px;
  border-radius: var(--radius-tag);
  font-size: 12px;
  font-weight: 500;
  background: rgba(0, 212, 255, 0.08);
  color: var(--cyan);
  border: 1px solid rgba(0, 212, 255, 0.15);
}

.news-tag::before {
  content: '';
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--cyan);
}

.news-time {
  font-size: 12px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.empty-state {
  border: 1px dashed rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-card);
  padding: 60px 24px;
  text-align: center;
  color: var(--text-muted);
  font-size: 14px;
  background: rgba(15, 31, 53, 0.3);
}

/* 侧边栏 */
.news-sidebar {
  display: flex;
  flex-direction: column;
  gap: 24px;
  position: sticky;
  top: calc(var(--nav-h) + 24px);
}

.side-block {
  background: var(--bg-glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-card);
  padding: 24px;
}

.side-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  position: relative;
  padding-bottom: 10px;
}

.side-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 32px;
  height: 2px;
  background: var(--cyan);
  border-radius: 2px;
}

.side-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.side-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 10px;
  font-size: 14px;
  color: var(--text-secondary);
  transition: background 0.25s ease, color 0.25s ease;
}

.side-link:hover {
  background: rgba(0, 212, 255, 0.06);
  color: var(--cyan);
}

.side-link i {
  font-size: 13px;
  color: var(--violet);
  width: 20px;
  text-align: center;
}

/* ============ FAQ ============ */
.faq-list {
  max-width: 720px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--border-glass);
  transition: border-color 0.25s ease;
}

.faq-item:first-child {
  border-top: 1px solid var(--border-glass);
}

.faq-q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  width: 100%;
  padding: 24px 8px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  text-align: left;
  transition: color 0.25s ease;
  line-height: 1.5;
}

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

.faq-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  transition: transform 0.25s ease, background 0.25s ease, border-color 0.25s ease;
  flex-shrink: 0;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
  background: rgba(0, 212, 255, 0.1);
  border-color: var(--cyan);
  color: var(--cyan);
}

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
  padding: 0 8px;
}

.faq-item.active .faq-a {
  max-height: 300px;
  padding-bottom: 20px;
}

.faq-a p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.75;
  border-left: 2px solid var(--cyan);
  padding-left: 16px;
}

/* ============ CTA ============ */
.cta-section {
  padding: 0 0 90px;
}

.cta-box {
  position: relative;
  background:
    radial-gradient(ellipse at 20% 40%, rgba(0, 212, 255, 0.12), transparent 55%),
    radial-gradient(ellipse at 80% 60%, rgba(46, 107, 255, 0.1), transparent 50%),
    var(--bg-panel);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-hero);
  padding: clamp(48px, 6vw, 80px) 32px;
  text-align: center;
  overflow: hidden;
}

.cta-box::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--cyan), transparent);
}

.cta-box::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0, 212, 255, 0.4), transparent);
}

.cta-title {
  font-size: clamp(24px, 3.5vw, 34px);
  font-weight: 700;
  color: #fff;
  margin-bottom: 14px;
  line-height: 1.3;
}

.cta-desc {
  font-size: 15px;
  color: var(--text-secondary);
  max-width: 520px;
  margin: 0 auto 32px;
  line-height: 1.7;
}

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

/* ============ 页脚 ============ */
.site-footer {
  background: var(--ink-primary);
  border-top: 1px solid var(--border-glass);
  padding: 56px 0 32px;
}

.footer-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 40px;
  flex-wrap: wrap;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-brand {
  font-size: 21px;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer-brand::before {
  content: '';
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 14px rgba(0, 212, 255, 0.5);
}

.footer-nav {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.footer-nav a {
  display: inline-flex;
  align-items: center;
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  font-size: 14px;
  color: var(--text-secondary);
  transition: color 0.25s ease, background 0.25s ease;
}

.footer-nav a:hover {
  color: var(--cyan);
  background: rgba(0, 212, 255, 0.06);
}

.footer-bottom {
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-copy {
  font-size: 13px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.footer-note {
  font-size: 12px;
  color: rgba(100, 122, 143, 0.7);
}

/* ============ 响应式 ============ */
@media screen and (max-width: 1199px) {
  .rewards-scroll {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .reward-card {
    min-width: 0;
  }
}

@media screen and (max-width: 991px) {
  .feature-block {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .feature-block.reverse {
    direction: ltr;
  }
  
  .feature-media {
    max-width: 600px;
  }

  .news-area {
    grid-template-columns: 1fr;
  }

  .news-sidebar {
    position: static;
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

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

@media screen and (max-width: 767px) {
  :root {
    --section-pad: 48px;
  }

  .site-nav {
    top: 10px;
    padding: 6px 12px;
    border-radius: 22px;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: 76px;
    left: 16px;
    right: 16px;
    background: rgba(9, 18, 34, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-glass);
    border-radius: 20px;
    flex-direction: column;
    align-items: stretch;
    padding: 16px;
    gap: 4px;
    transform: scaleY(0.92) translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.3s ease, opacity 0.3s ease;
    transform-origin: top center;
  }

  .nav-menu.open {
    transform: scaleY(1) translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-link {
    padding: 14px 18px;
    font-size: 15px;
    border-radius: 14px;
  }

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

  .hero-actions {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

  .feature-block {
    margin-bottom: 56px;
  }

  .rewards-scroll {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    overflow: visible;
  }

  .timeline-step {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    padding: 24px 0;
  }

  .timeline-step:not(:last-child)::after {
    left: 31px;
    top: 82px;
  }

  .step-percent {
    position: absolute;
    top: 12px;
    right: 0;
  }

  .step-content {
    flex: 1;
  }

  .news-list-card {
    flex-direction: column;
  }

  .news-thumb {
    width: 100%;
    height: 160px;
  }

  .news-sidebar {
    grid-template-columns: 1fr;
  }

  .footer-top {
    flex-direction: column;
    gap: 24px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }

  .cta-box {
    padding: 40px 20px;
  }
}

@media screen and (max-width: 520px) {
  .container {
    width: calc(100% - 32px);
  }

  .btn {
    padding: 0 20px;
    font-size: 14px;
  }

  .section-title {
    font-size: 24px;
  }

  .rewards-scroll {
    grid-template-columns: 1fr;
  }

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

  .timeline {
    padding-left: 0;
  }

  .step-dot {
    width: 56px;
    height: 56px;
    font-size: 18px;
  }

  .step-title {
    font-size: 17px;
  }

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

  .hero-title {
    font-size: 27px;
  }

  .news-thumb {
    height: 130px;
  }

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

/* roulang page: category1 */
/* ============ 设计变量 ============ */
:root {
  --bg-deep: #0A1628;
  --bg-page: #0B1726;
  --bg-panel: #0F1F35;
  --card-glass: rgba(16, 32, 55, 0.62);
  --cyan: #00D4FF;
  --blue: #2E6BFF;
  --violet: #7A7CFF;
  --amber: #FFC351;
  --text-main: #EAF2FF;
  --text-weak: #8B9CB8;
  --border-line: rgba(255, 255, 255, 0.08);
  --radius-hero: 20px;
  --radius-card: 16px;
  --radius-tag: 8px;
  --radius-pill: 999px;
  --shadow-card: 0 10px 30px rgba(0, 0, 0, 0.35);
  --shadow-glow: 0 0 24px rgba(0, 212, 255, 0.18);
  --font-main: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", -apple-system, sans-serif;
  --spacer-lg: 90px;
  --spacer-md: 64px;
  --spacer-sm: 48px;
}

/* ============ 基础 Reset ============ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

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

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.018) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.018) 1px, transparent 1px);
  background-size: 56px 56px;
  pointer-events: none;
  z-index: 0;
}

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

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

button {
  font-family: var(--font-main);
  cursor: pointer;
}

ul, ol {
  list-style: none;
}

.container {
  position: relative;
  z-index: 1;
  width: min(1200px, calc(100% - 48px));
  margin: 0 auto;
}

.section {
  position: relative;
  padding: var(--spacer-lg) 0;
}

.section-head {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 52px;
}

.section-head h2 {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: 0.01em;
  margin-bottom: 14px;
  line-height: 1.3;
}

.section-head p {
  color: var(--text-weak);
  font-size: 15px;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  background: rgba(0, 212, 255, 0.08);
  border: 1px solid rgba(0, 212, 255, 0.2);
  color: var(--cyan);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  margin-bottom: 18px;
}

.section-tag::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 10px rgba(0, 212, 255, 0.7);
}

/* ============ 按钮 ============ */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 52px;
  padding: 0 38px;
  border: none;
  border-radius: var(--radius-pill);
  background: linear-gradient(135deg, var(--cyan) 0%, var(--blue) 100%);
  color: #08131F;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.02em;
  cursor: pointer;
  box-shadow: 0 8px 26px rgba(0, 212, 255, 0.28);
  transition: all 0.3s ease;
  white-space: nowrap;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 36px rgba(0, 212, 255, 0.36);
  filter: brightness(1.08);
}

.btn-primary:active {
  transform: translateY(1px);
  box-shadow: 0 4px 16px rgba(0, 212, 255, 0.22);
}

.btn-primary:focus-visible,
.nav-toggle:focus-visible,
.faq-q:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* ============ 导航 ============ */
.site-nav {
  position: fixed;
  top: 14px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(1200px, calc(100% - 32px));
  padding: 10px 24px;
  background: rgba(9, 18, 34, 0.55);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-pill);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  transition: all 0.35s ease;
}

.site-nav.scrolled {
  background: rgba(9, 18, 34, 0.85);
  border-color: rgba(0, 212, 255, 0.16);
  box-shadow: 0 6px 30px rgba(0, 0, 0, 0.42);
}

.brand {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: 0.02em;
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.brand::before {
  content: "";
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 14px rgba(0, 212, 255, 0.8), 0 0 40px rgba(0, 212, 255, 0.3);
}

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

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 9px 18px;
  border-radius: var(--radius-pill);
  color: var(--text-weak);
  font-size: 14px;
  font-weight: 500;
  transition: all 0.25s ease;
}

.nav-link:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.045);
}

.nav-link.active {
  color: var(--cyan);
  background: rgba(0, 212, 255, 0.14);
}

.nav-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.7;
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border: 1px solid var(--border-line);
  border-radius: 50%;
  background: rgba(15, 31, 53, 0.7);
  color: var(--text-main);
  font-size: 16px;
}

/* ============ 页面横幅 ============ */
.page-banner {
  position: relative;
  min-height: 320px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 130px 24px 56px;
  background:
    linear-gradient(135deg, rgba(10, 22, 40, 0.92) 0%, rgba(11, 23, 38, 0.82) 40%, rgba(15, 31, 53, 0.72) 100%),
    url('/assets/images/backpic/back-1.webp') center center / cover no-repeat;
  overflow: hidden;
}

.page-banner::before {
  content: "";
  position: absolute;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 212, 255, 0.16) 0%, transparent 70%);
  top: -120px;
  left: 12%;
  pointer-events: none;
}

.page-banner::after {
  content: "";
  position: absolute;
  width: 360px;
  height: 360px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(122, 124, 255, 0.12) 0%, transparent 70%);
  bottom: -140px;
  right: 8%;
  pointer-events: none;
}

.banner-inner {
  max-width: 760px;
}

.banner-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  border-radius: var(--radius-pill);
  background: rgba(255, 195, 81, 0.1);
  border: 1px solid rgba(255, 195, 81, 0.24);
  color: var(--amber);
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 20px;
  letter-spacing: 0.04em;
}

.tag-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 10px rgba(255, 195, 81, 0.7);
}

.banner-inner h1 {
  font-size: 44px;
  font-weight: 700;
  letter-spacing: 0.01em;
  line-height: 1.3;
  margin-bottom: 16px;
  text-shadow: 0 4px 30px rgba(0, 0, 0, 0.4);
}

.banner-sub {
  font-size: 17px;
  color: rgba(234, 242, 255, 0.78);
  font-weight: 400;
  letter-spacing: 0.02em;
}

/* ============ 图文介绍 ============ */
.intro-section {
  background: linear-gradient(180deg, transparent 0%, rgba(15, 31, 53, 0.3) 100%);
}

.split-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 64px;
  align-items: center;
}

.split-text h2 {
  font-size: 30px;
  font-weight: 700;
  margin-bottom: 18px;
  line-height: 1.35;
}

.split-text p {
  color: var(--text-weak);
  font-size: 15.5px;
  margin-bottom: 16px;
}

.check-list {
  margin-top: 22px;
  display: grid;
  gap: 12px;
}

.check-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14.5px;
  color: rgba(234, 242, 255, 0.82);
}

.check-list li::before {
  content: "\f00c";
  font-family: "Font Awesome 6 Free";
  font-weight: 900;
  font-size: 12px;
  color: var(--cyan);
  width: 22px;
  height: 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(0, 212, 255, 0.12);
  border: 1px solid rgba(0, 212, 255, 0.2);
  flex-shrink: 0;
}

.split-media img {
  width: 100%;
  border-radius: var(--radius-hero);
  box-shadow: var(--shadow-card);
  border: 1px solid var(--border-line);
}

.split-media {
  position: relative;
}

.split-media::after {
  content: "";
  position: absolute;
  inset: 18px -18px -18px 18px;
  border-radius: var(--radius-hero);
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.12), transparent 60%);
  z-index: -1;
}

/* ============ 步骤时间线 ============ */
.steps-section {
  background: var(--bg-panel);
  border-top: 1px solid var(--border-line);
  border-bottom: 1px solid var(--border-line);
}

.steps-track {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  position: relative;
}

.step-item {
  position: relative;
  padding: 32px 26px;
  background: var(--card-glass);
  border-radius: var(--radius-card);
  border: 1px solid var(--border-line);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition: all 0.3s ease;
}

.step-item:hover {
  border-color: rgba(0, 212, 255, 0.35);
  box-shadow: var(--shadow-glow);
  transform: translateY(-4px);
}

.step-item:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 52px;
  right: -32px;
  width: 32px;
  border-top: 2px dashed rgba(0, 212, 255, 0.28);
  z-index: 0;
}

.step-num {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 212, 255, 0.12);
  border: 1px solid rgba(0, 212, 255, 0.3);
  color: var(--cyan);
  font-weight: 700;
  font-size: 17px;
  margin-bottom: 18px;
  box-shadow: 0 0 18px rgba(0, 212, 255, 0.1);
}

.step-item h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 10px;
}

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

/* ============ 适用场景 ============ */
.scenario-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 56px;
  align-items: center;
}

.scenario-text h2 {
  font-size: 30px;
  font-weight: 700;
  margin-bottom: 16px;
  line-height: 1.35;
}

.scenario-text p {
  color: var(--text-weak);
  font-size: 15.5px;
}

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

.scenario-card {
  display: flex;
  gap: 18px;
  padding: 26px;
  background: var(--card-glass);
  border-radius: var(--radius-card);
  border: 1px solid var(--border-line);
  backdrop-filter: blur(12px);
  transition: all 0.3s ease;
}

.scenario-card:hover {
  border-color: rgba(122, 124, 255, 0.35);
  box-shadow: 0 0 24px rgba(122, 124, 255, 0.14);
  transform: translateY(-3px);
}

.scenario-card:last-child {
  grid-column: span 2;
}

.scenario-icon {
  width: 46px;
  height: 46px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 14px;
  background: rgba(122, 124, 255, 0.12);
  border: 1px solid rgba(122, 124, 255, 0.25);
  color: var(--violet);
  font-size: 18px;
}

.scenario-body h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 6px;
}

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

/* ============ 访问建议 ============ */
.tips-section {
  background: linear-gradient(180deg, transparent 0%, rgba(15, 31, 53, 0.35) 100%);
  border-top: 1px solid var(--border-line);
}

.tips-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 24px;
}

.tip-card {
  position: relative;
  padding: 30px 28px;
  background: var(--card-glass);
  border-radius: var(--radius-card);
  border: 1px solid var(--border-line);
  backdrop-filter: blur(12px);
  transition: all 0.3s ease;
  overflow: hidden;
}

.tip-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0, 212, 255, 0.6), transparent);
  transition: left 0.6s ease;
}

.tip-card:hover::before {
  left: 100%;
}

.tip-card:hover {
  border-color: rgba(0, 212, 255, 0.3);
  box-shadow: var(--shadow-glow);
}

.tip-card:last-child {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 24px;
}

.tip-card:last-child .tip-icon {
  flex-shrink: 0;
}

.tip-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 14px;
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid rgba(0, 212, 255, 0.22);
  color: var(--cyan);
  font-size: 19px;
  margin-bottom: 16px;
}

.tip-card h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 8px;
}

.tip-card p {
  font-size: 14.5px;
  color: var(--text-weak);
  line-height: 1.75;
}

/* ============ FAQ ============ */
.faq-section {
  background: var(--bg-panel);
  border-top: 1px solid var(--border-line);
}

.faq-wrap {
  max-width: 720px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--border-line);
  transition: border-color 0.3s ease;
}

.faq-item:first-child {
  border-top: 1px solid var(--border-line);
}

.faq-item.open {
  border-color: rgba(0, 212, 255, 0.24);
}

.faq-q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 24px 4px;
  cursor: pointer;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-main);
  background: transparent;
  border: none;
  width: 100%;
  text-align: left;
  transition: color 0.25s ease;
  position: relative;
}

.faq-item.open .faq-q {
  color: var(--cyan);
}

.faq-icon {
  width: 30px;
  height: 30px;
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(0, 212, 255, 0.08);
  border: 1px solid rgba(0, 212, 255, 0.18);
  color: var(--cyan);
  font-size: 13px;
  transition: transform 0.25s ease, background 0.25s ease;
}

.faq-item.open .faq-icon {
  transform: rotate(45deg);
  background: rgba(0, 212, 255, 0.18);
}

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
  padding: 0 4px;
}

.faq-item.open .faq-a {
  max-height: 300px;
  padding: 0 4px 24px;
}

.faq-a p {
  font-size: 14.5px;
  color: var(--text-weak);
  line-height: 1.8;
  border-left: 3px solid rgba(0, 212, 255, 0.5);
  padding-left: 16px;
}

/* ============ CTA ============ */
.cta-section {
  padding-top: 0;
}

.cta-band {
  position: relative;
  text-align: center;
  padding: 72px 48px;
  border-radius: var(--radius-hero);
  background:
    radial-gradient(circle at 20% 0%, rgba(0, 212, 255, 0.14), transparent 45%),
    radial-gradient(circle at 85% 100%, rgba(122, 124, 255, 0.12), transparent 45%),
    linear-gradient(135deg, #0F1F35, #0A1628);
  border: 1px solid var(--border-line);
  overflow: hidden;
}

.cta-band::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(0, 212, 255, 0.6), rgba(122, 124, 255, 0.6), transparent);
}

.cta-band h2 {
  font-size: 30px;
  font-weight: 700;
  margin-bottom: 14px;
}

.cta-band p {
  color: var(--text-weak);
  font-size: 15.5px;
  margin-bottom: 32px;
}

/* ============ 页脚 ============ */
.site-footer {
  background: #081220;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding: 48px 0 32px;
}

.footer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  padding-bottom: 28px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-brand {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: 0.02em;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.footer-brand::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 12px rgba(0, 212, 255, 0.7);
}

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

.footer-nav a {
  color: var(--text-weak);
  font-size: 14px;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  transition: all 0.25s ease;
}

.footer-nav a:hover {
  color: var(--cyan);
  background: rgba(0, 212, 255, 0.08);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding-top: 24px;
}

.footer-copy {
  font-size: 13px;
  color: rgba(139, 156, 184, 0.7);
}

.footer-note {
  font-size: 13px;
  color: rgba(139, 156, 184, 0.55);
}

/* ============ 响应式 ============ */
@media (max-width: 1199px) {
  :root {
    --spacer-lg: 64px;
    --spacer-md: 56px;
    --spacer-sm: 40px;
  }

  .split-grid {
    gap: 44px;
  }

  .step-item:not(:last-child)::after {
    right: -20px;
    width: 20px;
  }

  .steps-track {
    gap: 20px;
  }
}

@media (max-width: 991px) {
  .split-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .split-media {
    max-width: 560px;
  }

  .steps-track {
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }

  .step-item:not(:last-child)::after {
    display: none;
  }

  .scenario-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

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

  .tip-card:last-child {
    grid-column: auto;
  }
}

@media (max-width: 767px) {
  :root {
    --spacer-lg: 48px;
    --spacer-md: 40px;
    --spacer-sm: 32px;
  }

  body {
    font-size: 15px;
  }

  .container {
    width: min(100% - 32px, 1200px);
  }

  /* 导航移动端 */
  .site-nav {
    top: 10px;
    width: calc(100% - 20px);
    padding: 8px 16px;
  }

  .brand {
    font-size: 17px;
  }

  .nav-menu {
    position: fixed;
    top: 66px;
    left: 10px;
    right: 10px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 18px;
    background: rgba(9, 18, 34, 0.97);
    border: 1px solid rgba(0, 212, 255, 0.15);
    border-radius: 20px;
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
  }

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

  .nav-link {
    padding: 14px 18px;
    font-size: 15px;
    border-radius: 12px;
  }

  .nav-toggle {
    display: inline-flex;
  }

  /* 横幅 */
  .page-banner {
    min-height: 280px;
    padding: 100px 20px 48px;
  }

  .banner-inner h1 {
    font-size: 30px;
  }

  .banner-sub {
    font-size: 15px;
  }

  /* 标题缩放 */
  .section-head h2,
  .split-text h2,
  .scenario-text h2,
  .cta-band h2 {
    font-size: 24px;
  }

  /* 时间线 */
  .steps-track {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .step-item {
    padding: 24px 20px;
  }

  /* 场景 */
  .scenario-list {
    grid-template-columns: 1fr;
  }

  .scenario-card:last-child {
    grid-column: auto;
  }

  .scenario-card {
    padding: 22px 20px;
  }

  /* 建议 */
  .tip-card {
    padding: 24px 22px;
  }

  .tip-card:last-child {
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
  }

  /* FAQ */
  .faq-q {
    font-size: 15px;
    padding: 20px 2px;
  }

  /* CTA */
  .cta-band {
    padding: 48px 24px;
  }

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

  .btn-primary {
    width: 100%;
    height: 48px;
    padding: 0 20px;
    font-size: 15px;
  }

  /* 页脚 */
  .footer-top {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 400px) {
  .brand {
    font-size: 15px;
  }

  .brand::before {
    width: 7px;
    height: 7px;
  }

  .step-num {
    width: 38px;
    height: 38px;
    font-size: 15px;
  }
}

/* roulang page: article */
:root {
  --bg-page: #0B1726;
  --bg-panel: #0F1F35;
  --glass-bg: rgba(16, 32, 55, 0.62);
  --glass-border: rgba(255, 255, 255, 0.08);
  --primary: #00D4FF;
  --secondary: #2E6BFF;
  --violet: #7A7CFF;
  --amber: #FFC351;
  --text-main: #E8F0FA;
  --text-secondary: #93A5C0;
  --text-muted: #5D7395;
  --radius-lg: 20px;
  --radius-md: 16px;
  --radius-sm: 8px;
  --shadow-card: 0 10px 30px rgba(0, 0, 0, 0.35);
  --shadow-glow: 0 0 24px rgba(0, 212, 255, 0.18);
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --gap-section: 90px;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  background: var(--bg-page);
  color: var(--text-main);
  line-height: 1.75;
  font-size: 16px;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  background-image: radial-gradient(ellipse at 85% 0%, rgba(0, 212, 255, 0.05) 0%, transparent 40%), radial-gradient(ellipse at 0% 85%, rgba(122, 124, 255, 0.035) 0%, transparent 40%);
  background-attachment: fixed;
}
img { max-width: 100%; display: block; }
a { color: var(--primary); text-decoration: none; transition: color .25s ease; }
button { font-family: inherit; cursor: pointer; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.container.narrow { max-width: 880px; }

.site-nav {
  position: fixed; top: 14px; left: 50%; transform: translateX(-50%); z-index: 1000;
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
  width: calc(100% - 48px); max-width: 1160px;
  padding: 10px 18px 10px 24px;
  background: rgba(9, 18, 34, 0.55);
  border: 1px solid var(--glass-border);
  border-radius: 999px;
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  transition: background .3s ease, box-shadow .3s ease, border-color .3s ease;
}
.site-nav.scrolled {
  background: rgba(9, 18, 34, 0.85);
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.3), 0 0 0 1px rgba(0, 212, 255, 0.12);
  border-color: rgba(0, 212, 255, 0.15);
}
.brand {
  font-size: 20px; font-weight: 700; letter-spacing: 0.02em; white-space: nowrap;
  background: linear-gradient(135deg, #FFFFFF 0%, var(--primary) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.nav-menu { display: flex; align-items: center; gap: 4px; }
.nav-link {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 8px 16px; border-radius: 999px;
  color: var(--text-secondary); font-size: 14px; font-weight: 500;
  transition: all .25s ease; white-space: nowrap;
}
.nav-dot { width: 5px; height: 5px; border-radius: 50%; background: transparent; transition: background .25s ease, box-shadow .25s ease; }
.nav-link:hover { color: var(--text-main); background: rgba(255, 255, 255, 0.05); }
.nav-link.active { color: var(--primary); background: rgba(0, 212, 255, 0.14); }
.nav-link.active .nav-dot { background: var(--primary); box-shadow: 0 0 8px rgba(0, 212, 255, 0.6); }
.nav-toggle {
  display: none; background: none; border: none; color: var(--text-main);
  font-size: 20px; width: 40px; height: 40px; border-radius: 50%;
  align-items: center; justify-content: center; transition: background .2s;
}
.nav-toggle:hover { background: rgba(255, 255, 255, 0.08); }

.breadcrumb-wrap { padding: 110px 0 20px; }
.breadcrumb { display: flex; align-items: center; flex-wrap: wrap; font-size: 13px; color: var(--text-muted); gap: 4px; }
.breadcrumb a { color: var(--text-secondary); transition: color .2s; }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb .sep { margin: 0 6px; opacity: .4; }
.breadcrumb .crumb-current { max-width: 300px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: var(--text-muted); }

.article-section { padding: 20px 0 40px; }
.article-header { text-align: center; padding: 30px 0 40px; }
.article-header h1 {
  font-size: 44px; font-weight: 700; line-height: 1.35; letter-spacing: -0.01em; margin-bottom: 18px;
  background: linear-gradient(135deg, #E8F0FA 30%, var(--primary) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.article-meta { display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 14px; font-size: 13px; color: var(--text-muted); }
.meta-item { display: inline-flex; align-items: center; gap: 6px; }
.meta-dot { color: var(--primary); }
.article-body {
  max-width: 780px; margin: 0 auto;
  background: var(--glass-bg); border: 1px solid var(--glass-border); border-radius: var(--radius-lg);
  padding: 48px 56px; backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  box-shadow: var(--shadow-card), 0 0 0 1px rgba(255, 255, 255, 0.05) inset;
}
.article-content { font-size: 16px; line-height: 1.85; color: var(--text-main); }
.article-content h2, .article-content h3 { margin: 32px 0 16px; line-height: 1.4; font-weight: 600; }
.article-content h2 { font-size: 26px; color: var(--text-main); padding-bottom: 10px; border-bottom: 1px solid var(--glass-border); }
.article-content h3 { font-size: 20px; color: var(--primary); }
.article-content p { margin: 16px 0; }
.article-content a { color: var(--primary); border-bottom: 1px solid transparent; }
.article-content a:hover { border-bottom-color: var(--primary); }
.article-content img { max-width: 100%; border-radius: var(--radius-md); margin: 24px auto; border: 1px solid var(--glass-border); }
.article-content blockquote { border-left: 3px solid var(--primary); background: rgba(0, 212, 255, 0.06); padding: 14px 20px; border-radius: 0 var(--radius-md) var(--radius-md) 0; margin: 24px 0; color: var(--text-secondary); }
.article-content ul, .article-content ol { margin: 16px 0; padding-left: 24px; }
.article-content li { margin: 8px 0; }
.article-content li::marker { color: var(--primary); }
.article-content table { display: block; overflow-x: auto; width: max-content; min-width: 100%; border-collapse: collapse; margin: 24px 0; background: var(--glass-bg); border-radius: var(--radius-md); font-size: 14px; }
.article-content th, .article-content td { padding: 12px 16px; border-bottom: 1px solid rgba(255, 255, 255, 0.06); text-align: left; white-space: nowrap; }
.article-content th { background: rgba(0, 212, 255, 0.08); color: var(--primary); font-weight: 600; }
.article-content tr:last-child td { border-bottom: none; }
.article-content code { background: rgba(0, 212, 255, 0.1); color: var(--primary); padding: 2px 8px; border-radius: 4px; font-size: 14px; font-family: "SF Mono", "Fira Code", Consolas, monospace; }
.article-content pre { background: var(--bg-panel); border: 1px solid var(--glass-border); border-radius: var(--radius-md); padding: 18px 24px; overflow-x: auto; margin: 24px 0; line-height: 1.6; }
.article-content pre code { background: none; padding: 0; color: var(--text-main); }
.article-content hr { border: none; border-top: 1px solid var(--glass-border); margin: 32px 0; }

.article-empty { text-align: center; padding: 60px 20px; }
.article-empty i { font-size: 40px; color: var(--text-muted); margin-bottom: 16px; }
.article-empty p { color: var(--text-secondary); margin-bottom: 24px; }

.tags-section { padding: 30px 0 10px; }
.tags-wrap { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; }
.tag { display: inline-flex; align-items: center; gap: 6px; padding: 6px 14px; background: var(--glass-bg); border: 1px solid var(--glass-border); border-radius: 999px; font-size: 13px; color: var(--text-secondary); transition: all .25s ease; }
.tag::before { content: ''; width: 4px; height: 4px; border-radius: 50%; background: var(--primary); opacity: .7; }
.tag:hover { border-color: rgba(0, 212, 255, 0.3); color: var(--primary); }

.pagination-section { padding: 30px 0 50px; }
.article-pagination { display: flex; align-items: center; justify-content: space-between; gap: 16px; max-width: 780px; margin: 0 auto; }
.pager-link { display: inline-flex; align-items: center; gap: 10px; padding: 12px 22px; background: var(--glass-bg); border: 1px solid var(--glass-border); border-radius: 999px; color: var(--text-secondary); font-size: 14px; transition: all .25s ease; }
.pager-link:hover { border-color: rgba(0, 212, 255, 0.4); color: var(--primary); transform: translateY(-2px); box-shadow: var(--shadow-glow); }
.pager-link.prev i { transition: transform .2s; }
.pager-link.prev:hover i { transform: translateX(-3px); }
.pager-link.next i { transition: transform .2s; }
.pager-link.next:hover i { transform: translateX(3px); }

.related-section { padding: 70px 0 var(--gap-section); }
.section-head { text-align: center; margin-bottom: 40px; }
.section-head h2 { font-size: 32px; font-weight: 700; margin-bottom: 8px; letter-spacing: -0.02em; }
.section-head p { color: var(--text-secondary); font-size: 14px; }
.related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.related-card {
  display: block; background: var(--glass-bg); border: 1px solid var(--glass-border);
  border-radius: var(--radius-md); overflow: hidden;
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  box-shadow: var(--shadow-card); transition: all .3s ease;
}
.related-card:hover { border-color: rgba(0, 212, 255, 0.35); transform: translateY(-4px); box-shadow: var(--shadow-glow), var(--shadow-card); }
.related-image { aspect-ratio: 16 / 9; overflow: hidden; background: var(--bg-panel); }
.related-image img { width: 100%; height: 100%; object-fit: cover; transition: transform .45s ease; }
.related-card:hover .related-image img { transform: scale(1.04); }
.related-info { padding: 20px 22px 24px; }
.related-tag { display: inline-block; padding: 4px 12px; background: rgba(0, 212, 255, 0.1); color: var(--primary); border-radius: 999px; font-size: 12px; margin-bottom: 12px; }
.related-info h3 { font-size: 18px; font-weight: 600; color: var(--text-main); margin-bottom: 8px; line-height: 1.4; transition: color .25s; }
.related-card:hover .related-info h3 { color: var(--primary); }
.related-info p { font-size: 14px; color: var(--text-secondary); line-height: 1.6; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }

.cta-section { padding: 30px 0 90px; }
.cta-inner {
  position: relative;
  background:
    radial-gradient(ellipse at 20% 20%, rgba(0, 212, 255, 0.18) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 80%, rgba(122, 124, 255, 0.15) 0%, transparent 60%),
    linear-gradient(rgba(10, 22, 40, 0.87), rgba(10, 22, 40, 0.94)),
    url('/assets/images/backpic/back-2.png') center / cover no-repeat;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 60px 40px; text-align: center; overflow: hidden;
}
.cta-inner::before { content: ''; position: absolute; top: 0; left: -50%; width: 200%; height: 1px; background: linear-gradient(90deg, transparent, var(--primary), transparent); opacity: .4; }
.cta-inner h2 { font-size: 32px; font-weight: 700; margin-bottom: 12px; }
.cta-inner p { color: var(--text-secondary); margin-bottom: 28px; font-size: 15px; }

.btn-primary {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 50px; padding: 0 36px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: #fff; font-size: 15px; font-weight: 600; border: none; border-radius: 999px;
  box-shadow: 0 4px 20px rgba(0, 212, 255, 0.4), 0 0 40px rgba(0, 212, 255, 0.15);
  transition: all .3s ease;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 28px rgba(0, 212, 255, 0.5), 0 0 50px rgba(0, 212, 255, 0.2); filter: brightness(1.08); color: #fff; }
.btn-primary:active { transform: translateY(0); }
.btn-lg { height: 54px; padding: 0 44px; font-size: 16px; }

.site-footer { background: #060E1A; border-top: 1px solid var(--glass-border); padding: 50px 0 20px; }
.footer-top { display: flex; align-items: center; justify-content: space-between; gap: 24px; margin-bottom: 36px; flex-wrap: wrap; }
.footer-brand {
  font-size: 20px; font-weight: 700;
  background: linear-gradient(135deg, #FFFFFF 0%, var(--primary) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.footer-nav { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.footer-nav a { padding: 8px 14px; border-radius: 999px; color: var(--text-secondary); font-size: 14px; transition: all .25s; }
.footer-nav a:hover { color: var(--primary); background: rgba(0, 212, 255, 0.08); }
.footer-bottom { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-top: 20px; border-top: 1px solid rgba(255, 255, 255, 0.05); flex-wrap: wrap; }
.footer-copy, .footer-note { font-size: 13px; color: var(--text-muted); }

@media (max-width: 1024px) {
  .related-grid { grid-template-columns: repeat(2, 1fr); }
  .article-body { padding: 40px 36px; }
}
@media (max-width: 768px) {
  .site-nav { width: calc(100% - 24px); top: 10px; padding: 8px 12px 8px 18px; }
  .nav-menu {
    display: none; position: fixed; top: 0; right: 0; width: 75%; max-width: 320px; height: 100vh;
    background: rgba(9, 18, 34, 0.97); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
    flex-direction: column; align-items: flex-start; justify-content: flex-start;
    padding: 80px 24px 30px; gap: 8px; border-radius: 0; z-index: 999;
    box-shadow: -10px 0 40px rgba(0, 0, 0, 0.4);
  }
  .nav-menu.open { display: flex; }
  .nav-link { width: 100%; padding: 12px 16px; font-size: 16px; }
  .nav-toggle { display: flex; }
  .breadcrumb-wrap { padding: 100px 0 12px; }
  .article-header h1 { font-size: 30px; }
  .article-body { padding: 28px 20px; }
  .article-pagination { flex-direction: column; }
  .pager-link { width: 100%; justify-content: center; }
  .related-grid { grid-template-columns: 1fr; }
  .cta-inner { padding: 40px 24px; }
  .cta-inner h2 { font-size: 26px; }
  .footer-top { flex-direction: column; align-items: flex-start; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
}
@media (max-width: 520px) {
  :root { --gap-section: 48px; }
  .article-header h1 { font-size: 25px; }
  .article-body { padding: 20px 16px; }
  .article-content h2 { font-size: 22px; }
  .breadcrumb .crumb-current { max-width: 140px; }
  .cta-inner h2 { font-size: 22px; }
  .cta-inner p { font-size: 14px; }
  .btn-lg { width: 100%; }
}

/* roulang page: category3 */
:root {
  --bg-page: #0B1726;
  --bg-panel: #0F1F35;
  --bg-elev: #142A45;
  --primary: #00D4FF;
  --blue: #2E6BFF;
  --violet: #7A7CFF;
  --amber: #FFC351;
  --text-main: #E8F1FF;
  --text-body: #B6C4DD;
  --text-weak: #7E8DAB;
  --border-glass: rgba(255,255,255,0.08);
  --radius-lg: 20px;
  --radius-md: 16px;
  --radius-sm: 8px;
  --shadow-card: 0 10px 30px rgba(0,0,0,0.35);
  --shadow-glow: 0 0 24px rgba(0,212,255,0.18);
  --font-h1: 42px;
  --font-h2: 30px;
  --font-h3: 22px;
  --font-body: 16px;
  --font-small: 14px;
  --spacer: 90px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: var(--font-body);
  line-height: 1.75;
  color: var(--text-body);
  background-color: var(--bg-page);
  background-image: radial-gradient(ellipse at 80% 10%, rgba(0,212,255,0.08) 0%, transparent 60%), radial-gradient(ellipse at 10% 40%, rgba(46,107,255,0.06) 0%, transparent 50%);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

a:hover {
  color: #33DFFF;
}

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

ul, ol {
  list-style-position: inside;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding-left: 32px;
  padding-right: 32px;
}

/* ===== 导航系统 ===== */
.site-nav {
  position: fixed;
  top: 14px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  width: calc(100% - 40px);
  max-width: 1160px;
  padding: 10px 12px 10px 22px;
  background: rgba(9,18,34,0.55);
  border: 1px solid var(--border-glass);
  border-radius: 999px;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 8px 32px rgba(0,0,0,0.25);
  transition: background 0.3s ease, box-shadow 0.3s ease;
}

.site-nav.scrolled {
  background: rgba(9,18,34,0.85);
  box-shadow: 0 8px 32px rgba(0,0,0,0.4), 0 0 0 1px rgba(0,212,255,0.1);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.brand {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: 0.5px;
  white-space: nowrap;
  position: relative;
}

.brand::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), transparent);
  border-radius: 2px;
  opacity: 0.5;
}

.brand:hover {
  color: var(--primary);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-body);
  transition: all 0.25s ease;
  white-space: nowrap;
}

.nav-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #3A4866;
  transition: background 0.3s ease, box-shadow 0.3s ease;
}

.nav-link:hover {
  color: var(--text-main);
  background: rgba(255,255,255,0.04);
}

.nav-link:hover .nav-dot {
  background: var(--primary);
}

.nav-link.active {
  color: var(--primary);
  background: rgba(0,212,255,0.14);
}

.nav-link.active .nav-dot {
  background: var(--primary);
  box-shadow: 0 0 8px rgba(0,212,255,0.6);
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  align-items: center;
  justify-content: center;
  color: var(--text-main);
  font-size: 18px;
  border: 1px solid var(--border-glass);
  background: rgba(255,255,255,0.04);
  transition: all 0.3s ease;
}

.nav-toggle:hover {
  color: var(--primary);
  border-color: rgba(0,212,255,0.4);
}

/* ===== 页脚 ===== */
.site-footer {
  background: #0A1628;
  border-top: 2px solid var(--border-glass);
  padding: 40px 0 28px;
  margin-top: 0;
}

.footer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding-bottom: 28px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.footer-brand {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: 0.5px;
}

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

.footer-nav a {
  padding: 6px 14px;
  font-size: 14px;
  color: var(--text-body);
  border-radius: 999px;
  border: 1px solid transparent;
  transition: all 0.25s ease;
}

.footer-nav a:hover {
  color: var(--primary);
  border-color: rgba(0,212,255,0.25);
  background: rgba(0,212,255,0.05);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 24px;
  font-size: 13px;
  color: var(--text-weak);
}

/* ===== 通用按钮 ===== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 52px;
  padding: 0 32px;
  border-radius: 999px;
  font-size: 16px;
  font-weight: 600;
  color: #061221;
  background: linear-gradient(135deg, var(--primary) 0%, #35C0FF 100%);
  box-shadow: 0 8px 24px rgba(0,212,255,0.25);
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(0,212,255,0.35);
  filter: brightness(1.08);
  color: #061221;
}

.btn-primary:active {
  transform: translateY(1px);
  box-shadow: 0 4px 16px rgba(0,212,255,0.25);
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 52px;
  padding: 0 32px;
  border-radius: 999px;
  font-size: 16px;
  font-weight: 500;
  color: var(--text-main);
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border-glass);
  backdrop-filter: blur(8px);
  transition: all 0.3s ease;
  cursor: pointer;
}

.btn-ghost:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(0,212,255,0.06);
}

/* ===== KV横幅 ===== */
.page-banner {
  position: relative;
  min-height: 340px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 120px 0 80px;
  background: linear-gradient(135deg, #0A1628 0%, #0F1F35 100%);
  overflow: hidden;
  text-align: center;
}

.page-banner::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url('/assets/images/backpic/back-2.png');
  background-size: cover;
  background-position: center;
  opacity: 0.35;
}

.page-banner::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10,22,40,0.6) 0%, rgba(10,22,40,0.5) 50%, rgba(11,23,38,0.9) 100%);
}

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

.banner-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 999px;
  font-size: 13px;
  color: var(--primary);
  background: rgba(0,212,255,0.12);
  border: 1px solid rgba(0,212,255,0.2);
  margin-bottom: 20px;
}

.banner-tag .tag-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 8px var(--primary);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.page-banner h1 {
  font-size: 44px;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.3;
  margin-bottom: 18px;
  letter-spacing: 1px;
}

.page-banner h1 .accent {
  color: var(--primary);
}

.banner-sub {
  max-width: 680px;
  margin: 0 auto;
  font-size: 17px;
  color: var(--text-body);
  line-height: 1.8;
}

.banner-particles {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  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: 64px 64px;
}

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

.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-header .section-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-header h2 {
  font-size: var(--font-h2);
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.4;
  margin-bottom: 12px;
}

.section-header p {
  max-width: 640px;
  margin: 0 auto;
  font-size: 16px;
  color: var(--text-body);
}

/* ===== 导语区 ===== */
.news-intro {
  padding: var(--spacer) 0 60px;
  position: relative;
}

.intro-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 60px;
  align-items: center;
}

.intro-content h2 {
  font-size: 32px;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.4;
  margin-bottom: 16px;
}

.intro-content p {
  margin-bottom: 16px;
  font-size: 16px;
  color: var(--text-body);
  line-height: 1.9;
}

.intro-list {
  list-style: none;
  margin-top: 20px;
}

.intro-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 12px;
  font-size: 15px;
  color: var(--text-body);
}

.intro-list .list-icon {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: rgba(0,212,255,0.15);
  color: var(--primary);
  font-size: 11px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 3px;
  flex-shrink: 0;
}

.intro-visual {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.intro-visual img {
  width: 100%;
  height: 360px;
  object-fit: cover;
}

.intro-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(0,212,255,0.1) 0%, transparent 60%);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  pointer-events: none;
}

/* ===== FAQ区 ===== */
.faq-section {
  padding: 60px 0 90px;
  position: relative;
}

.faq-section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 720px;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0,212,255,0.3), transparent);
}

.faq-wrap {
  max-width: 720px;
  margin: 0 auto;
}

.faq-list {
  border-top: 1px solid var(--border-glass);
}

.faq-item {
  border-bottom: 1px solid var(--border-glass);
  background: var(--bg-panel);
  border-radius: 0;
  transition: background 0.3s ease;
  position: relative;
}

.faq-item:first-child {
  border-radius: var(--radius-md) var(--radius-md) 0 0;
}

.faq-item:last-child {
  border-radius: 0 0 var(--radius-md) var(--radius-md);
}

.faq-item.active {
  background: rgba(16,32,55,0.8);
  box-shadow: inset 3px 0 0 var(--primary);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  width: 100%;
  padding: 22px 28px;
  text-align: left;
  font-size: 17px;
  font-weight: 600;
  color: var(--text-main);
  transition: color 0.25s ease;
  cursor: pointer;
}

.faq-item.active .faq-question {
  color: var(--primary);
}

.faq-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid var(--border-glass);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  color: var(--text-weak);
  flex-shrink: 0;
  transition: all 0.3s ease;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  padding: 0 28px;
  color: var(--text-body);
  font-size: 15px;
  line-height: 1.9;
  transition: max-height 0.4s ease, padding 0.4s ease;
}

.faq-item.active .faq-answer {
  max-height: 600px;
  padding: 0 28px 24px;
}

.faq-answer p {
  margin-bottom: 8px;
}

/* ===== 对比信息栏 ===== */
.compare-section {
  padding: 0 0 90px;
}

.compare-header {
  text-align: center;
  margin-bottom: 40px;
}

.compare-header h2 {
  font-size: var(--font-h2);
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 12px;
}

.compare-header p {
  font-size: 16px;
  color: var(--text-body);
}

.compare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  max-width: 960px;
  margin: 0 auto;
}

.compare-card {
  background: rgba(16,32,55,0.62);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  padding: 40px 36px;
  position: relative;
  overflow: hidden;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.compare-card:hover {
  border-color: rgba(0,212,255,0.3);
  box-shadow: var(--shadow-glow);
}

.compare-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), rgba(0,212,255,0.1));
  opacity: 0.7;
}

.compare-card:last-child::before {
  background: linear-gradient(90deg, var(--violet), rgba(122,124,255,0.1));
}

.compare-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 600;
  padding: 5px 14px;
  border-radius: 999px;
  margin-bottom: 18px;
}

.compare-card:nth-child(1) .compare-badge {
  color: var(--primary);
  background: rgba(0,212,255,0.12);
}

.compare-card:nth-child(2) .compare-badge {
  color: var(--violet);
  background: rgba(122,124,255,0.12);
}

.compare-card h3 {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 12px;
}

.compare-card p {
  font-size: 15px;
  color: var(--text-body);
  line-height: 1.8;
}

.compare-divider {
  position: absolute;
  top: 50%;
  left: -18px;
  transform: translateY(-50%);
  width: 36px;
  height: 36px;
  background: var(--bg-page);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-weak);
  z-index: 2;
  letter-spacing: 1px;
}

/* ===== CTA ===== */
.cta-section {
  padding: 0 0 90px;
}

.cta-inner-card {
  max-width: 860px;
  margin: 0 auto;
  background: var(--bg-panel);
  border: 1px solid var(--border-glass);
  border-radius: 24px;
  padding: 56px 48px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-inner-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 0%, rgba(0,212,255,0.1) 0%, transparent 70%);
  pointer-events: none;
}

.cta-inner-card::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 10%;
  width: 80%;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(0,212,255,0.5), transparent);
}

.cta-inner-card h2 {
  font-size: 32px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 14px;
  position: relative;
  z-index: 1;
}

.cta-inner-card p {
  font-size: 16px;
  color: var(--text-body);
  margin-bottom: 30px;
  position: relative;
  z-index: 1;
}

.cta-btns {
  display: flex;
  justify-content: center;
  gap: 16px;
  position: relative;
  z-index: 1;
  flex-wrap: wrap;
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  :root {
    --font-h1: 36px;
    --font-h2: 28px;
    --spacer: 72px;
  }

  .container {
    padding-left: 24px;
    padding-right: 24px;
  }

  .intro-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .intro-visual img {
    height: 300px;
  }

  .compare-grid {
    grid-template-columns: 1fr;
    gap: 20px;
    max-width: 640px;
  }

  .compare-divider {
    display: none;
  }
}

@media (max-width: 768px) {
  .site-nav {
    top: 10px;
    padding: 8px 8px 8px 16px;
  }

  .brand {
    font-size: 16px;
  }

  .nav-menu {
    position: fixed;
    top: 70px;
    left: 20px;
    right: 20px;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    background: rgba(9,18,34,0.95);
    border: 1px solid var(--border-glass);
    border-radius: 20px;
    padding: 16px;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 20px 60px rgba(0,0,0,0.5);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
  }

  .nav-menu.open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .nav-link {
    padding: 14px 16px;
    border-radius: 12px;
    font-size: 16px;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .page-banner {
    min-height: 300px;
    padding: 100px 0 60px;
  }

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

  .banner-sub {
    font-size: 15px;
  }

  .news-intro {
    padding: 48px 0 40px;
  }

  .intro-content h2 {
    font-size: 26px;
  }

  .faq-section {
    padding: 40px 0 60px;
  }

  .faq-question {
    padding: 18px 20px;
    font-size: 16px;
  }

  .faq-answer {
    padding: 0 20px;
  }

  .faq-item.active .faq-answer {
    padding: 0 20px 18px;
  }

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

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

  .cta-inner-card {
    padding: 40px 24px;
    border-radius: 16px;
  }

  .cta-inner-card h2 {
    font-size: 26px;
  }

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

  .footer-nav {
    justify-content: center;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
    gap: 8px;
  }
}

@media (max-width: 520px) {
  :root {
    --font-h1: 28px;
    --font-h2: 24px;
    --font-body: 15px;
  }

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

  .page-banner {
    min-height: 280px;
  }

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

  .intro-visual img {
    height: 220px;
  }

  .compare-card {
    padding: 28px 22px;
  }

  .btn-primary, .btn-ghost {
    height: 48px;
    padding: 0 24px;
    font-size: 15px;
    width: 100%;
  }

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

@media (min-width: 1200px) {
  .site-nav {
    padding-left: 26px;
    padding-right: 14px;
  }
}

/* roulang page: category2 */
:root {
  --bg-body: #0B1726;
  --bg-deep: #0A1628;
  --bg-panel: #0F1F35;
  --glass-bg: rgba(16,32,55,0.62);
  --glass-border: rgba(255,255,255,0.08);
  --primary: #00D4FF;
  --secondary: #2E6BFF;
  --violet: #7A7CFF;
  --amber: #FFC351;
  --text-main: #E8F0FA;
  --text-sub: #9AA8BD;
  --text-dim: #64748B;
  --radius-main: 20px;
  --radius-card: 16px;
  --radius-tag: 8px;
  --radius-pill: 999px;
  --shadow-card: 0 10px 30px rgba(0,0,0,0.35);
  --shadow-glow: 0 0 24px rgba(0,212,255,0.15);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-body);
  color: var(--text-main);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  position: relative;
  min-height: 100vh;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.015) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul,
ol {
  list-style: none;
}

button {
  font-family: inherit;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 28px;
  position: relative;
  z-index: 1;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 3px;
}

/* ≡ 导航 */
.site-nav {
  position: fixed;
  top: 14px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1000;
  display: flex;
  align-items: center;
  gap: 28px;
  background: rgba(9,18,34,0.55);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-pill);
  padding: 10px 18px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
  max-width: calc(100vw - 24px);
}

.site-nav.scrolled {
  background: rgba(9,18,34,0.85);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom-color: rgba(0,212,255,0.2);
  box-shadow: 0 8px 30px rgba(0,0,0,0.35);
}

.brand {
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 0.5px;
  background: linear-gradient(135deg, var(--primary), var(--violet));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  white-space: nowrap;
}

.nav-menu {
  display: flex;
  gap: 4px;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  color: var(--text-sub);
  font-size: 14px;
  font-weight: 500;
  transition: color 0.25s ease, background 0.25s ease;
}

.nav-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--text-dim);
  transition: background 0.25s ease, box-shadow 0.25s ease;
}

.nav-link:hover {
  color: var(--primary);
  background: rgba(0,212,255,0.07);
}

.nav-link:hover .nav-dot {
  background: var(--primary);
  box-shadow: 0 0 8px var(--primary);
}

.nav-link.active {
  color: var(--primary);
  background: rgba(0,212,255,0.14);
}

.nav-link.active .nav-dot {
  background: var(--primary);
  box-shadow: 0 0 8px var(--primary);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 20px;
  cursor: pointer;
  padding: 8px;
  border-radius: 10px;
  transition: background 0.25s ease;
}

.nav-toggle:hover {
  background: rgba(255,255,255,0.06);
}

/* ≡ 页头横幅 */
.page-hero {
  min-height: 320px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  padding: 120px 0 60px;
  background:
    linear-gradient(180deg, rgba(10,22,40,0.72), rgba(11,23,38,0.92)),
    url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
  overflow: hidden;
}

.page-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 20%, rgba(0,212,255,0.18), transparent 50%),
    radial-gradient(ellipse at 80% 80%, rgba(122,124,255,0.12), transparent 50%);
  pointer-events: none;
}

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

.page-hero h1 {
  font-size: 44px;
  font-weight: 800;
  letter-spacing: 1px;
  line-height: 1.3;
}

.page-hero p {
  margin-top: 14px;
  color: var(--text-sub);
  font-size: 18px;
}

/* ≡ 主体布局 */
.activity-layout {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 40px;
  padding: 60px 0 90px;
  align-items: start;
}

/* ≡ 左侧固定目录 */
.sticky-toc {
  position: sticky;
  top: 100px;
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-card);
  padding: 24px;
  box-shadow: var(--shadow-card);
}

.toc-title {
  font-size: 13px;
  color: var(--text-sub);
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: 14px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--glass-border);
}

.toc-list a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 10px;
  color: var(--text-sub);
  font-size: 15px;
  transition: color 0.2s ease, background 0.2s ease;
}

.toc-list li + li {
  margin-top: 4px;
}

.toc-list a::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--text-dim);
  transition: background 0.2s ease, box-shadow 0.2s ease;
}

.toc-list a:hover {
  color: var(--primary);
  background: rgba(0,212,255,0.08);
}

.toc-list a:hover::before {
  background: var(--primary);
  box-shadow: 0 0 8px var(--primary);
}

/* ≡ 右侧内容卡片 */
.content-main {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.content-card {
  position: relative;
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-card);
  padding: 36px;
  box-shadow: var(--shadow-card);
  scroll-margin-top: 110px;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
  overflow: hidden;
}

.content-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0,212,255,0.4), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.content-card:hover {
  border-color: rgba(0,212,255,0.28);
  box-shadow: var(--shadow-glow), var(--shadow-card);
}

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

.content-card h2 {
  font-size: 25px;
  font-weight: 700;
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 12px;
  line-height: 1.4;
}

.content-card h2 i {
  color: var(--primary);
  font-size: 22px;
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,212,255,0.1);
  border-radius: 10px;
  flex-shrink: 0;
}

.content-card > p {
  color: var(--text-sub);
  font-size: 15px;
  margin-top: 10px;
}

/* ≡ 活动概览 */
.overview-grid {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 32px;
  align-items: center;
  margin-top: 24px;
}

.overview-text p {
  color: var(--text-sub);
  font-size: 15px;
  margin-bottom: 12px;
}

.overview-text p:last-child {
  margin-bottom: 0;
}

.overview-media img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: 14px;
  border: 1px solid var(--glass-border);
}

/* ≡ 参与流程 */
.step-list {
  margin-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.step-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.step-num {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
  box-shadow: 0 4px 14px rgba(0,212,255,0.25);
}

.step-item h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
}

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

/* ≡ 规则列表 */
.rule-list {
  margin-top: 20px;
}

.rule-list li {
  padding: 12px 0 12px 26px;
  position: relative;
  color: var(--text-sub);
  font-size: 15px;
  border-bottom: 1px dashed rgba(255,255,255,0.06);
}

.rule-list li:last-child {
  border-bottom: none;
}

.rule-list li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 21px;
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background: var(--primary);
  box-shadow: 0 0 8px rgba(0,212,255,0.4);
}

/* ≡ 奖励网格 */
.reward-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 24px;
}

.reward-item {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 14px;
  padding: 20px;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.reward-item:hover {
  transform: translateY(-4px);
  border-color: rgba(0,212,255,0.3);
  box-shadow: var(--shadow-glow);
}

.reward-item h3 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.reward-item p {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.7;
}

/* ≡ CTA */
.cta-box {
  background: linear-gradient(135deg, rgba(46,107,255,0.15), rgba(0,212,255,0.08));
  border: 1px solid rgba(0,212,255,0.2);
  border-radius: var(--radius-main);
  padding: 48px 36px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.cta-box::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--primary), transparent);
}

.cta-box h3 {
  font-size: 26px;
  font-weight: 700;
  margin-bottom: 12px;
}

.cta-box p {
  color: var(--text-sub);
  font-size: 15px;
  margin-bottom: 24px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  height: 50px;
  padding: 0 32px;
  border-radius: var(--radius-pill);
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  font-weight: 600;
  font-size: 15px;
  box-shadow: 0 8px 24px rgba(0,212,255,0.25);
  transition: transform 0.2s ease, box-shadow 0.2s ease, filter 0.2s ease;
  border: none;
  cursor: pointer;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 30px rgba(0,212,255,0.35);
  filter: brightness(1.08);
}

.btn-primary:active {
  transform: translateY(0px);
  box-shadow: 0 6px 18px rgba(0,212,255,0.25);
}

/* ≡ 页脚 */
.site-footer {
  background: #070F1C;
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 48px 0 32px;
  position: relative;
  z-index: 1;
}

.footer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
  padding-bottom: 24px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.footer-brand {
  font-size: 20px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--violet));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.footer-nav {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

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

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

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 20px;
  color: var(--text-dim);
  font-size: 13px;
  flex-wrap: wrap;
  gap: 8px;
}

.footer-copy {
  font-variant-numeric: tabular-nums;
}

/* ≡ 响应式 */
@media (max-width: 1024px) {
  .activity-layout {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 28px;
  }

  .page-hero h1 {
    font-size: 38px;
  }
}

@media (max-width: 820px) {
  .overview-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
}

@media (max-width: 768px) {
  .site-nav {
    gap: 12px;
    padding: 8px 14px;
  }

  .nav-menu {
    display: none;
    position: fixed;
    top: 74px;
    left: 12px;
    right: 12px;
    background: rgba(9,18,34,0.92);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border: 1px solid var(--glass-border);
    border-radius: 18px;
    padding: 14px;
    flex-direction: column;
    gap: 6px;
    box-shadow: var(--shadow-card);
  }

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

  .nav-link {
    padding: 12px 16px;
    font-size: 15px;
  }

  .nav-toggle {
    display: block;
  }

  .page-hero {
    min-height: 260px;
    padding: 100px 0 48px;
  }

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

  .page-hero p {
    font-size: 15px;
  }

  .activity-layout {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 40px 0 60px;
  }

  .sticky-toc {
    position: static;
    margin-bottom: 0;
  }

  .content-card {
    padding: 24px;
  }

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

  .cta-box h3 {
    font-size: 22px;
  }

  .reward-list {
    grid-template-columns: 1fr;
  }
}

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

  .content-card h2 {
    font-size: 21px;
  }

  .step-item {
    flex-direction: column;
    gap: 8px;
  }

  .page-hero p {
    font-size: 14px;
  }

  .btn-primary {
    width: 100%;
    justify-content: center;
  }

  .footer-top {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}