/* roulang page: index */
/* ===== 设计变量 ===== */
:root {
  --primary: #0EA5E9;
  --primary-dark: #0369A1;
  --primary-light: #E0F2FE;
  --secondary: #0F4C81;
  --accent: #F97316;
  --accent-dark: #EA580C;
  --bg-gray: #F8FAFC;
  --bg-white: #FFFFFF;
  --text-main: #1E293B;
  --text-body: #475569;
  --text-muted: #94A3B8;
  --border: #E8EDF2;
  --success: #16A34A;
  --error: #DC2626;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px rgba(15,76,129,.08);
  --shadow-md: 0 12px 24px -8px rgba(15,76,129,.15);
  --shadow-lg: 0 20px 40px -12px rgba(15,76,129,.20);
  --container: 1200px;
  --header-h: 68px;
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 40px;
  --space-xl: 64px;
  --space-2xl: 80px;
  --transition: all .2s ease;
  --breakpoint-lg: 1024px;
  --breakpoint-md: 768px;
  --breakpoint-sm: 520px;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}
body {
  font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  color: var(--text-main);
  background: var(--bg-white);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; transition: var(--transition); }
ul, ol { list-style: none; }
button, input, select, textarea { font: inherit; color: inherit; }
button { border: none; background: none; cursor: pointer; }
:focus-visible {
  outline: 3px solid rgba(14,165,233,.4);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}
::placeholder { color: var(--text-muted); opacity: .8; }

/* ===== 容器 ===== */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding-left: 1rem;
  padding-right: 1rem;
}

/* ===== 通用徽章 ===== */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 14px;
  font-size: .75rem;
  font-weight: 600;
  border-radius: 999px;
  line-height: 1.4;
}
.badge-primary {
  background: var(--primary);
  color: #fff;
}
.section-tag {
  display: inline-block;
  padding: 4px 14px;
  font-size: .75rem;
  font-weight: 600;
  color: var(--primary-dark);
  background: rgba(14,165,233,.10);
  border-radius: 999px;
  margin-bottom: 14px;
  letter-spacing: .02em;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 44px;
  padding: 0 24px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  transition: var(--transition);
  cursor: pointer;
  white-space: nowrap;
  min-height: 40px;
}
.btn-primary {
  background: var(--primary);
  color: #fff;
}
.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 8px 20px -6px rgba(14,165,233,.45);
}
.btn-outline {
  background: transparent;
  color: var(--primary);
  border-color: var(--primary);
}
.btn-outline:hover {
  background: rgba(14,165,233,.08);
  border-color: var(--primary-dark);
  color: var(--primary-dark);
  transform: translateY(-1px);
}
.btn-accent {
  background: var(--accent);
  color: #fff;
}
.btn-accent:hover {
  background: var(--accent-dark);
  box-shadow: 0 8px 24px -6px rgba(249,115,22,.5);
  transform: scale(1.02);
}
.btn-text {
  background: transparent;
  color: var(--text-main);
  padding: 0 8px;
  font-weight: 500;
}
.btn-text:hover { color: var(--primary); }
.btn-lg {
  height: 52px;
  padding: 0 32px;
  font-size: 1.0625rem;
  border-radius: 10px;
}
.btn-sm {
  height: 36px;
  padding: 0 18px;
  font-size: .9375rem;
  border-radius: var(--radius-md);
}
.btn-block {
  width: 100%;
}

/* ===== 导航 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.brand-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  background: var(--primary);
  border-radius: 10px;
  flex-shrink: 0;
}
.brand-text {
  font-size: 1.25rem;
  font-weight: 700;
  color: #0F172A;
  letter-spacing: .01em;
  white-space: nowrap;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}
.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  font-size: .9375rem;
  font-weight: 500;
  color: var(--text-body);
  border-radius: var(--radius-sm);
  transition: color .2s ease;
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 0;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .25s ease;
}
.nav-link:hover {
  color: var(--primary);
}
.nav-link:hover::after {
  transform: scaleX(1);
}
.nav-link.active {
  color: var(--primary);
  font-weight: 600;
}
.nav-link.active::after {
  transform: scaleX(1);
}
.nav-action {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.countdown-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: var(--secondary);
  color: #fff;
  font-size: .75rem;
  font-weight: 600;
  border-radius: 999px;
  letter-spacing: .04em;
  line-height: 1;
}
.cd-clock {
  font-size: .8125rem;
  line-height: 1;
}
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text-main);
  border-radius: 2px;
  transition: var(--transition);
}
.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== Hero ===== */
.hero {
  background: linear-gradient(135deg, #E0F2FE 0%, #FFFFFF 60%);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(15,76,129,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(15,76,129,.05) 1px, transparent 1px);
  background-size: 44px 44px;
  pointer-events: none;
}
.hero-inner {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 48px;
  align-items: center;
  padding-top: var(--space-2xl);
  padding-bottom: var(--space-2xl);
  position: relative;
}
.hero-content {
  padding: 20px 0;
}
.hero h1 {
  font-size: clamp(2rem, 4.5vw, 3.25rem);
  font-weight: 800;
  line-height: 1.2;
  color: #0F172A;
  margin: 20px 0 18px;
  letter-spacing: -.01em;
}
.hero-subtitle {
  font-size: 1.125rem;
  color: var(--text-body);
  max-width: 540px;
  margin-bottom: 28px;
  line-height: 1.8;
}
.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}
.hero-trust {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
}
.trust-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.trust-item strong {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--secondary);
  line-height: 1.3;
}
.trust-item span {
  font-size: .875rem;
  color: var(--text-muted);
}
.hero-visual img {
  width: 100%;
  height: 420px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

/* ===== 数据条 ===== */
.stats-bar {
  background: var(--bg-gray);
  padding: 24px 0;
  border-bottom: 1px solid var(--border);
}
.stats-inner {
  display: flex;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
}
.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  text-align: center;
}
.stat strong {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--secondary);
  line-height: 1.2;
}
.stat span {
  font-size: .8125rem;
  color: var(--text-muted);
}

/* ===== 通用区块 ===== */
.section {
  padding: var(--space-2xl) 0;
}
.section-white { background: var(--bg-white); }
.section-gray { background: var(--bg-gray); }
.section-head {
  text-align: center;
  margin-bottom: 40px;
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}
.section-head h2 {
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-main);
  margin-bottom: 10px;
}
.section-head p {
  color: var(--text-body);
  font-size: 1rem;
}
.section-head.with-link {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  text-align: left;
  max-width: none;
  margin-bottom: 32px;
}
.section-head.with-link h2 {
  margin-bottom: 4px;
}
.section-link {
  color: var(--primary);
  font-weight: 600;
  font-size: .9375rem;
  white-space: nowrap;
  padding-bottom: 6px;
}
.section-link:hover {
  color: var(--primary-dark);
  text-decoration: underline;
}

/* ===== 优惠阶梯 ===== */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.step-card {
  position: relative;
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}
.step-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(14,165,233,.3);
}
.step-level {
  font-size: .75rem;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: .1em;
  margin-bottom: 12px;
}
.step-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
}
.step-card > p {
  color: var(--text-body);
  font-size: .9375rem;
  min-height: 48px;
  margin-bottom: 18px;
  line-height: 1.6;
}
.check-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 24px;
  flex: 1;
}
.check-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: .9375rem;
  color: #334155;
}
.check-list li::before {
  content: "";
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--primary);
  flex-shrink: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='none' stroke='white' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 10l3.5 3.5L15 6.5'/%3E%3C/svg%3E");
  background-size: 12px;
  background-position: center;
  background-repeat: no-repeat;
}
.step-card .btn {
  margin-top: auto;
}
.step-card.featured {
  border: 1.5px solid var(--primary);
  box-shadow: var(--shadow-md);
}
.step-card.premium {
  background: #F0F9FF;
  border: 2px solid var(--primary);
}
.premium-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent);
  color: #fff;
  font-size: .75rem;
  font-weight: 600;
  padding: 4px 14px;
  border-radius: 999px;
  white-space: nowrap;
  box-shadow: 0 4px 12px rgba(249,115,22,.35);
}

/* ===== 套餐对比 ===== */
.compare-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: stretch;
}
.compare-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  position: relative;
}
.compare-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.compare-card.main {
  border-top: 2px solid var(--primary);
  background: var(--bg-white);
  box-shadow: var(--shadow-md);
}
.compare-card.main .price-row {
  background: var(--primary-light);
  border-radius: var(--radius-md);
  padding: 16px 0;
  margin: 16px 0;
}
.compare-card h3 {
  font-size: 1.125rem;
  font-weight: 700;
  text-align: center;
  color: var(--text-main);
  margin-bottom: 8px;
}
.price-row {
  text-align: center;
  padding: 12px 0;
  margin: 8px 0 16px;
  border-top: 1px dashed var(--border);
  border-bottom: 1px dashed var(--border);
}
.price-row .currency {
  font-size: 1rem;
  font-weight: 700;
  vertical-align: top;
  color: var(--secondary);
}
.price-row .amount {
  font-size: 2rem;
  font-weight: 800;
  color: var(--secondary);
  line-height: 1.2;
}
.price-row .unit {
  font-size: .8125rem;
  color: var(--text-muted);
}
.compare-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 24px;
  flex: 1;
}
.compare-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: .9375rem;
  color: var(--text-body);
  padding-bottom: 8px;
  border-bottom: 1px solid #F1F5F9;
}
.compare-list li:last-child { border-bottom: none; }
.icon-check {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: rgba(22,163,74,.12);
  color: var(--success);
  font-size: .75rem;
  font-weight: 700;
  flex-shrink: 0;
}
.icon-x {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #F1F5F9;
  color: #CBD5E1;
  font-size: .75rem;
  font-weight: 700;
  flex-shrink: 0;
}
.compare-card .btn {
  width: 100%;
  margin-top: auto;
}

/* ===== 限时入口 ===== */
.promo-section {
  background: var(--secondary);
  padding: var(--space-2xl) 0;
  text-align: center;
}
.promo-section h2 {
  color: #fff;
  font-size: clamp(1.5rem, 2.5vw, 2.25rem);
  font-weight: 700;
  margin-bottom: 10px;
}
.promo-section .promo-desc {
  color: #E0F2FE;
  font-size: 1rem;
  margin-bottom: 32px;
}
.countdown {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 36px;
}
.count-block {
  background: #fff;
  border-radius: var(--radius-md);
  width: 80px;
  height: 80px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  box-shadow: 0 8px 24px rgba(0,0,0,.18);
}
.count-block .num {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--secondary);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}
.count-block .label {
  font-size: .75rem;
  color: var(--text-muted);
}
.promo-section .btn {
  min-width: 220px;
  height: 54px;
  font-size: 1.0625rem;
  border-radius: 10px;
  animation: breathe 2s ease infinite;
}
@keyframes breathe {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.02); }
}
.promo-note {
  color: #BFDBFE;
  font-size: .8125rem;
  margin-top: 16px;
}

/* ===== 咨询表单 ===== */
.contact-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}
.contact-copy .section-tag {
  margin-bottom: 12px;
}
.contact-copy h2 {
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  font-weight: 700;
  margin-bottom: 12px;
}
.contact-copy > p {
  color: var(--text-body);
  font-size: 1rem;
  margin-bottom: 24px;
}
.contact-copy .check-list {
  margin-bottom: 0;
}
.contact-form-wrap {
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 32px;
  border: 1px solid var(--border);
}
.form-group {
  margin-bottom: 20px;
}
.form-group label {
  display: block;
  font-size: .875rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 6px;
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  height: 44px;
  padding: 0 14px;
  background: var(--bg-gray);
  border: 1px solid #CBD5E1;
  border-radius: var(--radius-md);
  transition: var(--transition);
  font-size: .9375rem;
}
.form-group textarea {
  height: auto;
  min-height: 100px;
  padding: 12px 14px;
  resize: vertical;
  line-height: 1.5;
}
.form-group select {
  cursor: pointer;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--primary);
  outline: none;
  box-shadow: 0 0 0 4px rgba(14,165,233,.15);
  background: #fff;
}
.form-group.has-error input,
.form-group.has-error textarea {
  border-color: var(--error);
}
.form-error-msg {
  color: var(--error);
  font-size: .75rem;
  margin-top: 4px;
  display: block;
}
.btn-submit {
  width: 100%;
  height: 48px;
  font-size: 1rem;
  margin-top: 8px;
}
.form-privacy {
  text-align: center;
  font-size: .75rem;
  color: var(--text-muted);
  margin-top: 14px;
}
.form-success {
  background: #F0FDF4;
  border: 1px solid #BBF7D0;
  color: #166534;
  padding: 14px 16px;
  border-radius: var(--radius-md);
  font-size: .9375rem;
  margin-top: 16px;
  text-align: center;
}

/* ===== 最新资讯 ===== */
.news-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.news-card {
  display: flex;
  align-items: stretch;
  gap: 16px;
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px;
  transition: var(--transition);
}
.news-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: rgba(14,165,233,.3);
}
.news-thumb {
  width: 120px;
  height: 90px;
  border-radius: var(--radius-md);
  overflow: hidden;
  flex-shrink: 0;
  background: #F1F5F9;
}
.news-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.news-body {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-width: 0;
}
.news-body h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 6px;
}
.news-body > p {
  font-size: .875rem;
  color: var(--text-body);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 10px;
  flex: 1;
}
.news-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.news-time {
  font-size: .75rem;
  color: var(--text-muted);
}
.tag {
  display: inline-block;
  padding: 3px 10px;
  font-size: .75rem;
  font-weight: 600;
  background: var(--primary-light);
  color: var(--primary-dark);
  border-radius: 999px;
}
.news-more {
  font-size: .8125rem;
  font-weight: 600;
  color: var(--primary);
  margin-left: auto;
}
.news-card:hover .news-more {
  color: var(--primary-dark);
  text-decoration: underline;
}
.news-more-wrap {
  text-align: center;
  margin-top: 32px;
}
.empty-state {
  text-align: center;
  padding: 48px 20px;
}
.empty-icon {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  background: #F1F5F9;
  margin: 0 auto 16px;
  position: relative;
}
.empty-icon::before {
  content: "";
  position: absolute;
  top: 28px;
  left: 32px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 3px solid #CBD5E1;
  border-top-color: var(--primary);
  animation: spin 1.2s linear infinite;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}
.empty-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 4px;
}
.empty-desc {
  font-size: .875rem;
  color: var(--text-muted);
}

/* ===== 页脚 ===== */
.site-footer {
  background: var(--secondary);
  color: #fff;
  padding-top: var(--space-xl);
}
.footer-inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 48px;
}
.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}
.footer-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--primary);
  border-radius: 10px;
  flex-shrink: 0;
}
.footer-brand-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
}
.footer-brand p {
  color: #E0F2FE;
  font-size: .875rem;
  line-height: 1.7;
  max-width: 320px;
}
.footer-col h4 {
  font-size: .9375rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 16px;
}
.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-col a {
  color: #E0F2FE;
  font-size: .875rem;
}
.footer-col a:hover {
  color: #7DD3FC;
}
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.14);
  padding: 20px 0;
  text-align: center;
}
.footer-bottom p {
  color: #BFDBFE;
  font-size: .8125rem;
}

/* ===== 返回顶部 ===== */
.back-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  font-size: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: var(--transition);
  z-index: 90;
}
.back-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-top:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
}
.back-top svg {
  width: 18px;
  height: 18px;
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .countdown-badge {
    display: none;
  }
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .hero-visual img {
    height: 320px;
  }
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
  .step-card.premium {
    grid-column: span 2;
  }
  .compare-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }
  .compare-card {
    padding: 24px 18px;
  }
  .contact-inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .footer-inner {
    grid-template-columns: 1fr 1fr;
  }
}
@media (max-width: 768px) {
  :root {
    --space-2xl: 56px;
    --space-xl: 48px;
  }
  .nav-toggle {
    display: flex;
  }
  .main-nav {
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: rgba(255,255,255,.98);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    flex-direction: column;
    align-items: stretch;
    padding: 12px 16px 20px;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 16px 32px rgba(15,76,129,.1);
    display: none;
    gap: 2px;
  }
  .main-nav.open {
    display: flex;
  }
  .nav-link {
    padding: 12px 14px;
    font-size: 1rem;
  }
  .nav-link::after {
    display: none;
  }
  .nav-link.active {
    background: var(--primary-light);
    border-radius: var(--radius-md);
  }
  .nav-action .btn-text,
  .nav-action .btn-primary {
    display: none;
  }
  .hero-inner {
    padding-top: 48px;
    padding-bottom: 48px;
  }
  .hero h1 {
    font-size: clamp(1.75rem, 8vw, 2.25rem);
  }
  .hero-subtitle {
    font-size: 1rem;
  }
  .hero-visual img {
    height: 220px;
  }
  .stats-inner {
    gap: 24px;
    justify-content: flex-start;
  }
  .grid-3 {
    grid-template-columns: 1fr;
  }
  .step-card.premium {
    grid-column: auto;
  }
  .compare-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .compare-card.main {
    order: -1;
  }
  .countdown {
    gap: 10px;
  }
  .count-block {
    width: 60px;
    height: 60px;
  }
  .count-block .num {
    font-size: 1.375rem;
  }
  .news-card {
    flex-direction: column;
    padding: 12px;
  }
  .news-thumb {
    width: 100%;
    height: 160px;
  }
  .news-body h3 {
    white-space: normal;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
  }
  .news-time {
    width: 100%;
  }
  .news-more {
    margin-left: 0;
  }
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .contact-form-wrap {
    padding: 24px 20px;
  }
}
@media (max-width: 520px) {
  .container {
    padding-left: .75rem;
    padding-right: .75rem;
  }
  .hero-actions {
    flex-direction: column;
  }
  .hero-actions .btn {
    width: 100%;
  }
  .hero-trust {
    gap: 20px;
  }
  .trust-item strong {
    font-size: 1.125rem;
  }
  .stats-inner {
    gap: 18px;
  }
  .stat strong {
    font-size: 1.25rem;
  }
  .countdown {
    gap: 6px;
  }
  .count-block {
    width: 52px;
    height: 56px;
  }
  .count-block .num {
    font-size: 1.125rem;
  }
  .promo-section .btn {
    width: 100%;
    min-width: 0;
  }
  .news-thumb {
    height: 130px;
  }
  .news-meta {
    gap: 8px;
  }
  .back-top {
    right: 16px;
    bottom: 16px;
  }
}

/* roulang page: article */
:root {
        --primary: #0EA5E9;
        --primary-dark: #0369A1;
        --primary-light: #E0F2FE;
        --navy: #0F4C81;
        --accent: #F97316;
        --accent-dark: #EA580C;
        --bg: #F8FAFC;
        --card: #FFFFFF;
        --text: #1E293B;
        --text-sub: #475569;
        --text-weak: #94A3B8;
        --border: #E8EDF2;
        --success: #16A34A;
        --danger: #DC2626;
        --radius: 12px;
        --radius-sm: 8px;
        --shadow-sm: 0 1px 3px rgba(15, 76, 129, .08);
        --shadow-hover: 0 12px 24px -8px rgba(15, 76, 129, .15);
        --shadow-lg: 0 20px 40px -12px rgba(15, 76, 129, .20);
        --font: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
        --container: 1200px;
        --space-section: 80px;
        --space-card: 32px;
    }
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
    body {
        font-family: var(--font);
        font-size: 16px;
        line-height: 1.75;
        color: var(--text);
        background: var(--bg);
        -webkit-font-smoothing: antialiased;
    }
    img { max-width: 100%; display: block; }
    a { color: var(--primary); text-decoration: none; transition: color .2s ease; }
    a:hover { color: var(--primary-dark); }
    ul, ol { padding-left: 1.25rem; }
    button, input, select, textarea { font-family: inherit; font-size: inherit; line-height: inherit; }
    .container { max-width: var(--container); margin: 0 auto; padding: 0 1rem; }

    /* Header */
    .site-header {
        position: sticky;
        top: 0;
        z-index: 100;
        background: rgba(255, 255, 255, .92);
        backdrop-filter: blur(14px);
        -webkit-backdrop-filter: blur(14px);
        border-bottom: 1px solid var(--border);
        height: 68px;
    }
    .nav-inner {
        height: 68px;
        display: flex;
        align-items: center;
        gap: 1.5rem;
    }
    .brand {
        display: flex;
        align-items: center;
        gap: .625rem;
        flex-shrink: 0;
    }
    .brand-icon {
        background: var(--primary);
        border-radius: 10px;
        width: 38px;
        height: 38px;
        display: flex;
        align-items: center;
        justify-content: center;
        box-shadow: 0 4px 10px rgba(14, 165, 233, .25);
    }
    .brand-text {
        font-weight: 700;
        font-size: 1.25rem;
        color: #0F172A;
        white-space: nowrap;
    }
    .main-nav {
        display: flex;
        align-items: center;
        gap: .25rem;
        flex: 1;
        justify-content: center;
    }
    .nav-link {
        color: var(--text-sub);
        font-weight: 500;
        font-size: .95rem;
        padding: .5rem .875rem;
        border-radius: var(--radius-sm);
        position: relative;
        transition: color .2s;
    }
    .nav-link::after {
        content: "";
        position: absolute;
        left: .875rem;
        right: .875rem;
        bottom: 0;
        height: 2px;
        background: var(--primary);
        border-radius: 2px;
        transform: scaleX(0);
        transform-origin: left;
        transition: transform .25s ease;
    }
    .nav-link:hover { color: var(--primary); }
    .nav-link:hover::after { transform: scaleX(1); }
    .nav-link.active { color: var(--primary); }
    .nav-link.active::after { transform: scaleX(1); }
    .nav-action {
        display: flex;
        align-items: center;
        gap: .5rem;
        flex-shrink: 0;
    }
    .countdown-badge {
        background: var(--navy);
        color: #fff;
        font-size: .75rem;
        font-weight: 600;
        padding: 6px 12px;
        border-radius: 999px;
        display: flex;
        align-items: center;
        gap: 6px;
        white-space: nowrap;
    }
    .cd-clock { font-size: .875rem; line-height: 1; }
    .nav-toggle {
        display: none;
        flex-direction: column;
        justify-content: center;
        gap: 5px;
        background: transparent;
        border: none;
        padding: 10px;
        cursor: pointer;
        border-radius: 8px;
    }
    .nav-toggle span {
        display: block;
        width: 22px;
        height: 2px;
        background: var(--text);
        border-radius: 2px;
        transition: transform .25s, opacity .2s;
    }
    .nav-toggle:hover span { background: var(--primary); }
    .nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
    .nav-toggle.open span:nth-child(2) { opacity: 0; }
    .nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

    /* Buttons */
    .btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: .5rem;
        padding: .625rem 1.375rem;
        border-radius: var(--radius-sm);
        font-weight: 600;
        font-size: 1rem;
        line-height: 1.4;
        cursor: pointer;
        border: 1px solid transparent;
        transition: all .2s ease;
        text-align: center;
    }
    .btn-sm { padding: .4375rem .875rem; font-size: .875rem; height: 36px; }
    .btn-primary {
        background: var(--primary);
        color: #fff;
        border-color: var(--primary);
    }
    .btn-primary:hover {
        background: var(--primary-dark);
        border-color: var(--primary-dark);
        color: #fff;
        transform: translateY(-1px);
        box-shadow: 0 8px 20px rgba(14, 165, 233, .25);
    }
    .btn-outline {
        background: transparent;
        color: var(--primary);
        border-color: var(--primary);
    }
    .btn-outline:hover {
        background: rgba(14, 165, 233, .1);
        color: var(--primary-dark);
        border-color: var(--primary-dark);
    }
    .btn-text {
        background: transparent;
        color: var(--text-sub);
        padding: .5rem .75rem;
    }
    .btn-text:hover { color: var(--primary); background: rgba(14, 165, 233, .08); }
    .btn-accent {
        background: var(--accent);
        color: #fff;
        border-color: var(--accent);
        min-width: 200px;
        min-height: 52px;
        padding: .75rem 2rem;
    }
    .btn-accent:hover {
        background: var(--accent-dark);
        border-color: var(--accent-dark);
        color: #fff;
        transform: scale(1.02);
        box-shadow: 0 8px 24px rgba(249, 115, 22, .35);
    }

    /* Breadcrumb */
    .breadcrumb {
        background: var(--bg);
        border-bottom: 1px solid var(--border);
        padding: .75rem 0;
        font-size: .875rem;
    }
    .breadcrumb .container { display: flex; align-items: center; gap: .5rem; flex-wrap: wrap; }
    .breadcrumb a { color: var(--primary); }
    .breadcrumb a:hover { text-decoration: underline; }
    .breadcrumb .sep { color: var(--text-weak); margin: 0 .25rem; }
    .breadcrumb .current { color: var(--text-weak); max-width: 320px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

    /* Article Header */
    .article-header {
        background: #fff;
        padding: 3rem 0 2rem;
        border-bottom: 1px solid var(--border);
    }
    .article-header h1 {
        font-size: clamp(1.5rem, 3vw, 2.25rem);
        font-weight: 700;
        line-height: 1.35;
        color: #0F172A;
        max-width: 900px;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }
    .article-meta {
        display: flex;
        align-items: center;
        gap: 1.5rem;
        flex-wrap: wrap;
        margin-top: 1.25rem;
        color: var(--text-weak);
        font-size: .8125rem;
    }
    .article-meta span { display: inline-flex; align-items: center; gap: .375rem; }
    .article-meta span::before { content: ""; width: 4px; height: 4px; border-radius: 50%; background: var(--border); display: inline-block; }
    .article-meta span:first-child::before { display: none; }
    .article-cover {
        margin-top: 2rem;
        border-radius: var(--radius);
        overflow: hidden;
        box-shadow: var(--shadow-sm);
        max-height: 460px;
        background: var(--border);
    }
    .article-cover img {
        width: 100%;
        height: auto;
        object-fit: cover;
        aspect-ratio: 16 / 9;
    }

    /* Article Body */
    .article-content {
        background: #fff;
        padding: 3rem 0 4rem;
    }
    .article-body {
        max-width: 820px;
        margin: 0 auto;
        font-size: 16px;
        line-height: 1.9;
        color: var(--text-sub);
    }
    .article-body p { margin-bottom: 1.5em; }
    .article-body p:first-of-type { font-size: 1.125rem; color: var(--text); font-weight: 400; }
    .article-body h2 {
        font-size: 1.5rem;
        font-weight: 700;
        color: var(--text);
        margin: 2em 0 .75em;
        line-height: 1.3;
        padding-top: .5em;
    }
    .article-body h3 {
        font-size: 1.25rem;
        font-weight: 600;
        color: var(--text);
        margin: 1.75em 0 .5em;
    }
    .article-body h4 {
        font-size: 1.125rem;
        font-weight: 600;
        color: var(--text);
        margin: 1.5em 0 .5em;
    }
    .article-body ul, .article-body ol { margin-bottom: 1.5em; padding-left: 1.5em; }
    .article-body ul li::marker { color: var(--primary); }
    .article-body ol li::marker { color: var(--navy); font-weight: 600; }
    .article-body li { margin-bottom: .5em; }
    .article-body blockquote {
        border-left: 4px solid var(--primary);
        background: #F0F9FF;
        padding: 1rem 1.25rem;
        margin: 1.5em 0;
        border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
        color: var(--text-sub);
        font-style: normal;
    }
    .article-body blockquote p:last-child { margin-bottom: 0; }
    .article-body img {
        max-width: 100%;
        border-radius: var(--radius-sm);
        border: 1px solid var(--border);
        margin: 1.5em 0;
    }
    .article-body figure { margin: 1.5em 0; }
    .article-body figcaption { font-size: .75rem; color: var(--text-weak); text-align: center; margin-top: .5em; }
    .article-body a { color: var(--primary); text-decoration: underline; text-underline-offset: 3px; }
    .article-body a:hover { color: var(--primary-dark); }
    .article-body code {
        background: #1E293B;
        color: #E2E8F0;
        padding: 2px 8px;
        border-radius: 4px;
        font-size: .875em;
    }
    .article-body pre {
        background: #1E293B;
        color: #E2E8F0;
        padding: 1rem 1.25rem;
        border-radius: var(--radius-sm);
        overflow-x: auto;
        margin: 1.5em 0;
        line-height: 1.6;
    }
    .article-body pre code { background: none; padding: 0; color: inherit; }
    .article-body table {
        width: 100%;
        border-collapse: collapse;
        margin: 1.5em 0;
        font-size: .9375rem;
    }
    .article-body th, .article-body td {
        border: 1px solid var(--border);
        padding: .75em 1em;
        text-align: left;
    }
    .article-body th { background: var(--bg); font-weight: 600; color: var(--text); }
    .article-not-found {
        text-align: center;
        padding: 4rem 1rem;
        background: #fff;
        border-radius: var(--radius);
        border: 1px dashed var(--border);
    }
    .article-not-found h2 { font-size: 1.5rem; color: var(--text); margin-bottom: .5rem; }
    .article-not-found p { color: var(--text-weak); margin-bottom: 1.5rem; }

    /* Related Articles */
    .related-section {
        background: var(--bg);
        padding: var(--space-section) 0;
    }
    .section-head {
        text-align: center;
        margin-bottom: 2.5rem;
    }
    .section-tag {
        display: inline-block;
        background: rgba(14, 165, 233, .1);
        color: var(--primary);
        font-size: .75rem;
        font-weight: 600;
        padding: 4px 14px;
        border-radius: 999px;
        margin-bottom: .75rem;
    }
    .section-head h2 {
        font-size: clamp(1.5rem, 2.5vw, 2rem);
        font-weight: 700;
        color: var(--text);
        line-height: 1.3;
    }
    .related-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 1.5rem;
    }
    .related-card {
        background: var(--card);
        border: 1px solid var(--border);
        border-radius: var(--radius);
        overflow: hidden;
        transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
    }
    .related-card:hover {
        transform: translateY(-4px);
        box-shadow: var(--shadow-hover);
        border-color: rgba(14, 165, 233, .3);
    }
    .related-cover { overflow: hidden; aspect-ratio: 16 / 9; background: #F1F5F9; }
    .related-cover img { width: 100%; height: 100%; object-fit: cover; transition: transform .3s; }
    .related-card:hover .related-cover img { transform: scale(1.05); }
    .related-info { padding: 1.25rem; }
    .related-info h3 {
        font-size: .9375rem;
        font-weight: 600;
        color: var(--text);
        line-height: 1.5;
        margin-bottom: .75rem;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
        min-height: 2.8em;
    }
    .related-info h3 a { color: inherit; }
    .related-info h3 a:hover { color: var(--primary); }
    .related-time { font-size: .75rem; color: var(--text-weak); }

    /* Article Back */
    .article-back-wrap {
        background: #fff;
        padding: 2rem 0 4rem;
        border-top: 1px solid var(--border);
    }
    .article-back-wrap .container { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 1rem; }
    .article-back a.btn { min-width: 140px; }
    .article-share { display: flex; gap: .75rem; align-items: center; font-size: .875rem; color: var(--text-weak); }
    .article-share a {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 36px;
        height: 36px;
        border-radius: 50%;
        border: 1px solid var(--border);
        color: var(--text-sub);
        transition: all .2s;
        font-size: .8125rem;
        font-weight: 600;
    }
    .article-share a:hover { background: var(--primary); border-color: var(--primary); color: #fff; }

    /* Footer */
    .site-footer {
        background: var(--navy);
        color: #fff;
        padding: 64px 0 0;
    }
    .footer-inner {
        display: grid;
        grid-template-columns: 2fr 1fr 1fr 1fr;
        gap: 2.5rem;
        padding-bottom: 3rem;
    }
    .footer-logo {
        display: flex;
        align-items: center;
        gap: .625rem;
        margin-bottom: 1rem;
    }
    .footer-icon {
        background: rgba(255, 255, 255, .15);
        border-radius: 8px;
        width: 34px;
        height: 34px;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    .footer-brand-name { font-weight: 700; font-size: 1.125rem; }
    .footer-brand p { color: #B6D4E8; font-size: .875rem; line-height: 1.7; max-width: 320px; }
    .footer-col h4 {
        color: #fff;
        font-size: .9375rem;
        font-weight: 600;
        margin-bottom: 1rem;
    }
    .footer-col ul { list-style: none; padding: 0; }
    .footer-col ul li { margin-bottom: .625rem; }
    .footer-col ul a {
        color: #B6D4E8;
        font-size: .875rem;
        transition: color .2s;
    }
    .footer-col ul a:hover { color: #7DD3FC; }
    .footer-bottom {
        border-top: 1px solid rgba(255, 255, 255, .1);
        padding: 1.5rem 0;
        text-align: center;
    }
    .footer-bottom p { color: #B6D4E8; font-size: .8125rem; }

    /* Back to top */
    .back-top {
        position: fixed;
        right: 20px;
        bottom: 20px;
        width: 44px;
        height: 44px;
        border-radius: 50%;
        background: var(--primary);
        color: #fff;
        display: flex;
        align-items: center;
        justify-content: center;
        cursor: pointer;
        border: none;
        box-shadow: 0 8px 20px rgba(14, 165, 233, .3);
        opacity: 0;
        visibility: hidden;
        transform: translateY(10px);
        transition: all .3s ease;
        z-index: 99;
    }
    .back-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
    .back-top:hover { background: var(--primary-dark); transform: translateY(-2px); }
    .back-top svg { width: 18px; height: 18px; }

    /* Mobile nav drawer */
    @media (max-width: 1023px) {
        .main-nav {
            position: fixed;
            top: 68px;
            left: 0;
            right: 0;
            background: #fff;
            border-bottom: 1px solid var(--border);
            box-shadow: 0 20px 40px rgba(15, 76, 129, .1);
            flex-direction: column;
            align-items: stretch;
            padding: .5rem 1rem 1rem;
            gap: .25rem;
            display: none;
            max-height: calc(100vh - 68px);
            overflow-y: auto;
        }
        .main-nav.open { display: flex; }
        .nav-link { padding: .875rem 1rem; font-size: 1rem; }
        .nav-link::after { display: none; }
        .nav-link.active { background: rgba(14, 165, 233, .08); border-radius: var(--radius-sm); }
        .nav-toggle { display: flex; }
        .countdown-badge { display: none; }
        .nav-action .btn-text { display: none; }
        .footer-inner { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 767px) {
        :root { --space-section: 56px; }
        .brand-text { font-size: 1.05rem; }
        .nav-action .btn-sm { padding: .4375rem .75rem; font-size: .8125rem; }
        .article-header { padding: 2rem 0 1.5rem; }
        .article-meta { gap: .75rem; font-size: .75rem; }
        .related-grid { grid-template-columns: 1fr; }
        .footer-inner { grid-template-columns: 1fr; gap: 2rem; }
        .article-back-wrap .container { flex-direction: column; align-items: flex-start; }
        .article-share { margin-top: .5rem; }
    }
    @media (max-width: 520px) {
        .article-body { font-size: 15px; line-height: 1.85; }
        .article-meta span:nth-child(3) { display: none; }
    }

/* roulang page: category1 */
:root {
  --primary: #0EA5E9;
  --primary-dark: #0369A1;
  --primary-light: #E0F2FE;
  --navy: #0F4C81;
  --accent: #F97316;
  --accent-dark: #EA580C;
  --bg: #F8FAFC;
  --white: #FFFFFF;
  --text: #1E293B;
  --text-secondary: #475569;
  --text-muted: #94A3B8;
  --border: #E8EDF2;
  --success: #16A34A;
  --danger: #DC2626;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --shadow-card: 0 1px 3px rgba(15, 76, 129, .08);
  --shadow-hover: 0 12px 24px -8px rgba(15, 76, 129, .15);
  --shadow-form: 0 20px 40px -12px rgba(15, 76, 129, .20);
  --transition: all .25s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--text-secondary);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

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

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

button {
  font-family: inherit;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding-left: 1rem;
  padding-right: 1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 40px;
  padding: 0 20px;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: var(--primary);
  color: var(--white);
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
}

.btn-text {
  background: transparent;
  color: var(--text-secondary);
  height: 36px;
  padding: 0 8px;
}

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

.btn-sm {
  height: 36px;
  padding: 0 16px;
  font-size: .9375rem;
}

.btn-lg {
  height: 48px;
  padding: 0 32px;
  font-size: 1.0625rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, .92);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 16px;
}

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

.brand-icon {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 10px rgba(14, 165, 233, .25);
}

.brand-text {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: .01em;
}

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

.nav-link {
  font-size: .9375rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 20px 0;
  position: relative;
  transition: color .2s ease;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: var(--primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .25s ease;
}

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

.nav-link:hover::after,
.nav-link.active::after {
  transform: scaleX(1);
}

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

.nav-action {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.countdown-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--navy);
  color: var(--white);
  font-size: .75rem;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: 999px;
  margin-right: 8px;
  white-space: nowrap;
}

.cd-clock {
  font-size: .8125rem;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 8px;
}

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

.nav-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

.nav-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.category-hero {
  padding: 72px 0 60px;
  background: linear-gradient(120deg, #E0F2FE 0%, #F8FAFC 60%, #FFFFFF 100%);
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
}

.category-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
  opacity: .06;
  pointer-events: none;
}

.category-hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 48px;
  align-items: center;
}

.tag-badge {
  display: inline-block;
  font-size: .75rem;
  font-weight: 600;
  color: var(--primary);
  background: rgba(14, 165, 233, .1);
  border-radius: 999px;
  padding: 4px 14px;
  margin-bottom: 16px;
}

.category-hero-content h1 {
  font-size: clamp(2rem, 4vw, 2.5rem);
  font-weight: 800;
  line-height: 1.2;
  color: var(--text);
  margin-bottom: 16px;
}

.category-hero-content p {
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--text-secondary);
  max-width: 520px;
}

.category-hero-media img {
  width: 100%;
  height: 280px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-form);
}

.section {
  padding: 80px 0;
}

.section-white {
  background: var(--white);
}

.section-gray {
  background: var(--bg);
}

.section-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 48px;
}

.section-tag {
  display: inline-block;
  font-size: .75rem;
  font-weight: 600;
  color: var(--primary);
  background: rgba(14, 165, 233, .1);
  border-radius: 999px;
  padding: 4px 14px;
  margin-bottom: 14px;
}

.section-head h2 {
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  font-weight: 700;
  color: var(--text);
  line-height: 1.3;
  margin-bottom: 12px;
}

.section-head p {
  font-size: .9375rem;
  color: var(--text-muted);
  line-height: 1.75;
}

.content-row {
  display: grid;
  grid-template-columns: 1.15fr .85fr;
  gap: 56px;
  align-items: center;
}

.content-text p {
  font-size: 1rem;
  line-height: 1.9;
  color: var(--text-secondary);
  margin-bottom: 1.2em;
}

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

.content-media img {
  width: 100%;
  height: 340px;
  object-fit: cover;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
}

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

.feature-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-card);
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(14, 165, 233, .3);
}

.feature-card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  margin-bottom: 18px;
}

.feature-card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 8px;
}

.feature-card p {
  font-size: .9375rem;
  line-height: 1.75;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.card-link {
  font-size: .875rem;
  font-weight: 500;
  color: var(--primary);
  transition: color .2s;
}

.card-link:hover {
  color: var(--primary-dark);
}

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

.step-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 32px 24px 28px;
  box-shadow: var(--shadow-card);
  transition: var(--transition);
  position: relative;
}

.step-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(14, 165, 233, .3);
}

.step-num {
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 14px;
  display: block;
}

.step-card h3 {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 8px;
}

.step-card p {
  font-size: .875rem;
  line-height: 1.75;
  color: var(--text-secondary);
}

.review-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--white);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-card);
  transition: var(--transition);
}

.review-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(14, 165, 233, .3);
}

.review-card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.review-body {
  padding: 20px;
}

.review-body h3 {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 8px;
}

.review-body p {
  font-size: .875rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.review-meta {
  font-size: .8125rem;
  color: var(--text-muted);
}

.faq-list {
  max-width: 820px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--border);
}

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

.faq-question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 4px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  transition: color .2s;
}

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

.faq-icon {
  font-size: 1.5rem;
  font-weight: 300;
  color: var(--primary);
  transition: transform .3s ease;
  line-height: 1;
  flex-shrink: 0;
  margin-left: 12px;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height .35s ease, padding .35s ease;
  color: var(--text-secondary);
  line-height: 1.8;
  font-size: .9375rem;
  padding: 0 4px;
}

.faq-item.active .faq-answer {
  max-height: 500px;
  padding-bottom: 20px;
}

.section-cta {
  background: var(--primary-light);
  padding: 56px 0;
}

.cta-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.cta-text h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}

.cta-text p {
  color: var(--text-secondary);
  font-size: .9375rem;
}

.site-footer {
  background: var(--navy);
  color: var(--white);
  padding: 64px 0 0;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 48px;
}

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

.footer-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: rgba(255, 255, 255, .12);
  display: flex;
  align-items: center;
  justify-content: center;
}

.footer-brand-name {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--white);
}

.footer-brand p {
  font-size: .875rem;
  line-height: 1.75;
  color: rgba(224, 242, 254, .75);
}

.footer-col h4 {
  font-size: .9375rem;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 16px;
}

.footer-col ul {
  list-style: none;
  padding: 0;
}

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

.footer-col ul a {
  font-size: .875rem;
  color: rgba(224, 242, 254, .75);
  transition: color .2s;
}

.footer-col ul a:hover {
  color: #7DD3FC;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, .1);
  padding: 20px 0;
}

.footer-bottom p {
  font-size: .8125rem;
  color: rgba(224, 242, 254, .65);
  text-align: center;
}

.back-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--primary);
  color: var(--white);
  border: none;
  cursor: pointer;
  font-size: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 20px rgba(14, 165, 233, .3);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: var(--transition);
  z-index: 99;
}

.back-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-top:hover {
  background: var(--primary-dark);
}

@media (max-width: 1024px) {
  .countdown-badge {
    display: none;
  }

  .main-nav {
    gap: 18px;
  }

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

  .category-hero-inner {
    gap: 32px;
  }
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .main-nav {
    position: fixed;
    top: 68px;
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 8px 24px 24px;
    box-shadow: 0 16px 24px -8px rgba(15, 76, 129, .1);
    transform: translateY(-120%);
    transition: transform .3s ease;
    z-index: 100;
  }

  .main-nav.open {
    transform: translateY(0);
  }

  .nav-link {
    width: 100%;
    padding: 14px 0;
    font-size: 1rem;
    border-bottom: 1px solid var(--border);
  }

  .nav-link::after {
    display: none;
  }

  .nav-link.active {
    color: var(--primary);
    font-weight: 600;
  }

  .category-hero {
    padding: 56px 0 48px;
  }

  .category-hero-inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .category-hero-media img {
    height: 220px;
  }

  .section {
    padding: 56px 0;
  }

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

  .content-media img {
    height: 260px;
  }

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

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

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

  .cta-inner {
    flex-direction: column;
    align-items: flex-start;
  }

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

@media (max-width: 520px) {
  .brand-text {
    font-size: 1.0625rem;
  }

  .nav-action .btn-sm {
    display: none;
  }

  .category-hero-content p {
    font-size: .9375rem;
  }

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

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

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

  .footer-inner {
    grid-template-columns: 1fr;
  }

  .btn-lg {
    width: 100%;
  }
}

/* roulang page: category2 */
:root {
            --primary: #0EA5E9;
            --primary-dark: #0369A1;
            --primary-light: #E0F2FE;
            --navy: #0F4C81;
            --accent: #F97316;
            --accent-dark: #EA580C;
            --bg: #F8FAFC;
            --card: #FFFFFF;
            --text: #1E293B;
            --text-secondary: #475569;
            --text-muted: #94A3B8;
            --border: #E8EDF2;
            --success: #16A34A;
            --error: #DC2626;
            --radius-card: 12px;
            --radius-btn: 8px;
            --shadow-card: 0 1px 3px rgba(15, 76, 129, .08);
            --shadow-hover: 0 12px 24px -8px rgba(15, 76, 129, .15);
            --shadow-form: 0 20px 40px -12px rgba(15, 76, 129, .20);
            --font: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--font);
            font-size: 1rem;
            line-height: 1.75;
            color: var(--text);
            background: var(--card);
        }
        img {
            max-width: 100%;
            display: block;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color .2s ease;
        }
        a:hover {
            color: var(--primary-dark);
        }
        ul {
            list-style: none;
        }
        button {
            border: none;
            cursor: pointer;
            font-family: inherit;
        }
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: .9375rem;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1rem;
        }
        /* ===== 导航 ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255, 255, 255, .92);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border-bottom: 1px solid var(--border);
            height: 68px;
        }
        .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 68px;
            gap: 1rem;
        }
        .brand {
            display: flex;
            align-items: center;
            gap: .5rem;
            flex-shrink: 0;
        }
        .brand-icon {
            width: 34px;
            height: 34px;
            background: var(--primary);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .brand-text {
            font-size: 1.25rem;
            font-weight: 700;
            color: #0F172A;
            letter-spacing: .5px;
            white-space: nowrap;
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 1.5rem;
        }
        .nav-link {
            position: relative;
            font-size: .9375rem;
            font-weight: 500;
            color: var(--text-secondary);
            padding: 6px 2px;
            transition: color .2s ease;
        }
        .nav-link::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: -2px;
            width: 0;
            height: 2px;
            background: var(--primary);
            border-radius: 2px;
            transition: width .25s ease;
        }
        .nav-link:hover {
            color: var(--primary);
        }
        .nav-link:hover::after {
            width: 100%;
        }
        .nav-link.active {
            color: var(--primary);
            font-weight: 600;
        }
        .nav-link.active::after {
            width: 100%;
        }
        .nav-action {
            display: flex;
            align-items: center;
            gap: .75rem;
            flex-shrink: 0;
        }
        .countdown-badge {
            display: inline-flex;
            align-items: center;
            gap: .3rem;
            background: var(--navy);
            color: #fff;
            font-size: .75rem;
            font-weight: 600;
            padding: 5px 12px;
            border-radius: 999px;
            letter-spacing: .3px;
            white-space: nowrap;
        }
        .cd-clock {
            font-size: .85rem;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: .9375rem;
            font-weight: 600;
            border-radius: var(--radius-btn);
            line-height: 1;
            transition: all .2s ease;
            text-align: center;
        }
        .btn-sm {
            height: 36px;
            padding: 0 1rem;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
            border: 1px solid var(--primary);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            border-color: var(--primary-dark);
            color: #fff;
            transform: translateY(-1px);
        }
        .btn-text {
            background: transparent;
            color: var(--text-secondary);
            padding: 0 .25rem;
            height: 36px;
        }
        .btn-text:hover {
            color: var(--primary);
            background: rgba(14, 165, 233, .08);
        }
        .btn-outline {
            background: #fff;
            border: 1px solid var(--primary);
            color: var(--primary);
        }
        .btn-outline:hover {
            background: rgba(14, 165, 233, .1);
            border-color: var(--primary-dark);
            color: var(--primary-dark);
        }
        .btn-accent {
            background: var(--accent);
            border: 1px solid var(--accent);
            color: #fff;
        }
        .btn-accent:hover {
            background: var(--accent-dark);
            border-color: var(--accent-dark);
            transform: translateY(-1px);
            box-shadow: 0 8px 20px -6px rgba(249, 115, 22, .45);
        }
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: transparent;
            padding: 8px;
            border-radius: 6px;
        }
        .nav-toggle span {
            width: 20px;
            height: 2px;
            background: var(--text);
            border-radius: 2px;
            transition: all .25s ease;
        }
        /* ===== Hero ===== */
        .category-hero {
            background: linear-gradient(135deg, var(--primary-light) 0%, #FFFFFF 60%);
            padding: 72px 0 64px;
            position: relative;
            overflow: hidden;
        }
        .category-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: linear-gradient(rgba(14, 165, 233, .04) 1px, transparent 1px),
                linear-gradient(90deg, rgba(14, 165, 233, .04) 1px, transparent 1px);
            background-size: 32px 32px;
            pointer-events: none;
        }
        .hero-grid {
            display: grid;
            grid-template-columns: 58% 42%;
            gap: 2.5rem;
            align-items: center;
            position: relative;
        }
        .hero-badge {
            display: inline-block;
            background: var(--primary);
            color: #fff;
            font-size: .75rem;
            font-weight: 600;
            padding: 4px 14px;
            border-radius: 999px;
            margin-bottom: 1rem;
            letter-spacing: .5px;
        }
        .hero-title {
            font-size: clamp(2rem, 4vw, 2.5rem);
            font-weight: 800;
            line-height: 1.2;
            color: #0F172A;
            margin-bottom: .75rem;
        }
        .hero-desc {
            font-size: 1.0625rem;
            color: var(--text-secondary);
            max-width: 420px;
            line-height: 1.75;
        }
        .hero-media {
            border-radius: 16px;
            overflow: hidden;
            box-shadow: 0 12px 32px -12px rgba(15, 76, 129, .2);
        }
        .hero-media img {
            width: 100%;
            height: 260px;
            object-fit: cover;
        }
        /* ===== 板块标题 ===== */
        .section {
            padding: 80px 0;
        }
        .section-gray {
            background: var(--bg);
        }
        .section-center {
            text-align: center;
        }
        .section-tag {
            display: inline-block;
            background: rgba(14, 165, 233, .12);
            color: var(--primary-dark);
            font-size: .75rem;
            font-weight: 600;
            padding: 4px 14px;
            border-radius: 999px;
            margin-bottom: 12px;
            letter-spacing: .3px;
        }
        .section-title {
            font-size: clamp(1.5rem, 2.5vw, 2rem);
            font-weight: 700;
            line-height: 1.3;
            color: #0F172A;
            margin-bottom: .75rem;
        }
        .section-sub {
            font-size: .9375rem;
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto;
        }
        .section-header {
            margin-bottom: 40px;
        }
        /* ===== 介绍区 ===== */
        .intro-wrap {
            display: grid;
            grid-template-columns: 1fr;
            gap: 2rem;
        }
        .intro-text {
            font-size: 1.0625rem;
            color: var(--text-secondary);
            line-height: 2;
        }
        .intro-text p {
            margin-bottom: 1.2rem;
        }
        .intro-image {
            border-radius: 12px;
            overflow: hidden;
            box-shadow: var(--shadow-card);
        }
        .intro-image img {
            width: 100%;
            height: 360px;
            object-fit: cover;
        }
        /* ===== 图文卡片 ===== */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 1.5rem;
        }
        .feature-card {
            background: var(--card);
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            transition: all .25s ease;
        }
        .feature-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(14, 165, 233, .3);
        }
        .feature-card-img {
            height: 200px;
            overflow: hidden;
        }
        .feature-card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .4s ease;
        }
        .feature-card:hover .feature-card-img img {
            transform: scale(1.03);
        }
        .feature-card-body {
            padding: 24px;
        }
        .feature-card-body h3 {
            font-size: 1.125rem;
            font-weight: 700;
            color: #0F172A;
            margin-bottom: 10px;
        }
        .feature-card-body p {
            font-size: .9375rem;
            color: var(--text-secondary);
            line-height: 1.75;
        }
        .feature-card-tag {
            display: inline-block;
            font-size: .75rem;
            font-weight: 600;
            color: var(--primary-dark);
            background: rgba(14, 165, 233, .12);
            padding: 3px 10px;
            border-radius: 999px;
            margin-bottom: 12px;
        }
        /* ===== FAQ ===== */
        .faq-wrap {
            max-width: 780px;
            margin: 0 auto;
        }
        .faq-item {
            border-bottom: 1px solid var(--border);
        }
        .faq-item:first-child {
            border-top: 1px solid var(--border);
        }
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            width: 100%;
            padding: 18px 0;
            background: transparent;
            font-size: 1rem;
            font-weight: 600;
            color: var(--text);
            text-align: left;
            transition: color .2s ease;
        }
        .faq-question:hover {
            color: var(--primary);
        }
        .faq-icon {
            font-size: 1.25rem;
            color: var(--primary);
            transition: transform .3s ease;
            line-height: 1;
            margin-left: 1rem;
        }
        .faq-item.open .faq-icon {
            transform: rotate(45deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height .3s ease;
        }
        .faq-answer-inner {
            padding: 0 0 18px;
            font-size: .9375rem;
            color: var(--text-secondary);
            line-height: 1.8;
        }
        /* ===== CTA ===== */
        .cta-bar {
            background: var(--primary-light);
            padding: 60px 0;
        }
        .cta-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 2rem;
            flex-wrap: wrap;
        }
        .cta-title {
            font-size: 1.375rem;
            font-weight: 700;
            color: #0F172A;
            margin-bottom: 6px;
        }
        .cta-desc {
            font-size: .9375rem;
            color: var(--text-secondary);
        }
        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--navy);
            color: #fff;
            padding: 64px 0 0;
        }
        .footer-inner {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1fr;
            gap: 2.5rem;
            padding-bottom: 48px;
        }
        .footer-logo {
            display: flex;
            align-items: center;
            gap: .5rem;
            margin-bottom: 14px;
        }
        .footer-icon {
            width: 32px;
            height: 32px;
            background: var(--primary);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .footer-brand-name {
            font-size: 1.125rem;
            font-weight: 700;
            color: #fff;
        }
        .footer-brand p {
            font-size: .875rem;
            color: #B0C4D8;
            line-height: 1.7;
            max-width: 280px;
        }
        .footer-col h4 {
            font-size: .9375rem;
            font-weight: 600;
            color: #fff;
            margin-bottom: 16px;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a {
            font-size: .875rem;
            color: #B0C4D8;
            transition: color .2s ease;
        }
        .footer-col ul li a:hover {
            color: #7DD3FC;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, .12);
            padding: 20px 0;
            text-align: center;
        }
        .footer-bottom p {
            font-size: .8125rem;
            color: #9DB4C8;
        }
        /* ===== 返回顶部 ===== */
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 4px 12px rgba(14, 165, 233, .3);
            opacity: 0;
            visibility: hidden;
            transition: all .3s ease;
            z-index: 99;
        }
        .back-to-top.show {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background: var(--primary-dark);
        }
        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .countdown-badge {
                display: none;
            }
            .main-nav {
                gap: 1rem;
            }
            .nav-link {
                font-size: .875rem;
            }
        }
        @media (max-width: 768px) {
            .site-header {
                height: 60px;
            }
            .nav-inner {
                height: 60px;
            }
            .nav-toggle {
                display: flex;
            }
            .main-nav {
                position: fixed;
                top: 60px;
                left: 0;
                right: 0;
                background: #fff;
                flex-direction: column;
                align-items: stretch;
                padding: 12px 1rem 20px;
                gap: 0;
                border-bottom: 1px solid var(--border);
                box-shadow: 0 12px 24px rgba(15, 76, 129, .1);
                display: none;
            }
            .main-nav.open {
                display: flex;
            }
            .nav-link {
                padding: 14px 0;
                font-size: 1rem;
                border-bottom: 1px solid #F1F5F9;
            }
            .nav-link::after {
                display: none;
            }
            .nav-link.active {
                color: var(--primary);
            }
            .nav-action {
                display: none;
            }
            .nav-toggle.open span:nth-child(1) {
                transform: translateY(7px) rotate(45deg);
            }
            .nav-toggle.open span:nth-child(2) {
                opacity: 0;
            }
            .nav-toggle.open span:nth-child(3) {
                transform: translateY(-7px) rotate(-45deg);
            }
            .hero-grid {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
            .hero-media img {
                height: 200px;
            }
            .category-hero {
                padding: 48px 0;
            }
            .section {
                padding: 56px 0;
            }
            .card-grid {
                grid-template-columns: 1fr;
                gap: 1rem;
            }
            .intro-image img {
                height: 220px;
            }
            .cta-inner {
                flex-direction: column;
                text-align: center;
                justify-content: center;
            }
            .cta-btn {
                width: 100%;
            }
            .footer-inner {
                grid-template-columns: 1fr 1fr;
                gap: 2rem;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
        }
        @media (max-width: 520px) {
            .brand-text {
                font-size: 1rem;
            }
            .hero-title {
                font-size: 1.75rem;
            }
            .footer-inner {
                grid-template-columns: 1fr;
            }
            .footer-brand {
                grid-column: auto;
            }
            .back-to-top {
                bottom: 20px;
                right: 20px;
            }
        }

/* roulang page: category3 */
:root {
  --primary: #0EA5E9;
  --primary-dark: #0369A1;
  --primary-light: #E0F2FE;
  --navy: #0F4C81;
  --accent: #F97316;
  --accent-dark: #EA580C;
  --bg: #F8FAFC;
  --card: #FFFFFF;
  --text: #1E293B;
  --text-body: #475569;
  --text-weak: #94A3B8;
  --border: #E8EDF2;
  --success: #16A34A;
  --danger: #DC2626;
  --r-lg: 16px;
  --r-md: 12px;
  --r-sm: 8px;
  --shadow-sm: 0 1px 3px rgba(15,76,129,.08);
  --shadow-md: 0 12px 24px -8px rgba(15,76,129,.15);
  --shadow-lg: 0 20px 40px -12px rgba(15,76,129,.20);
  --container: 1200px;
  --font: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-body);
  background: #fff;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--primary); text-decoration: none; transition: color .2s ease; }
a:hover { color: var(--primary-dark); }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input, select, textarea { font-family: inherit; }
.container { max-width: var(--container); margin: 0 auto; padding: 0 1rem; }

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
  height: 68px;
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 1.25rem;
}
.brand {
  display: flex;
  align-items: center;
  gap: .65rem;
  flex-shrink: 0;
}
.brand-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 10px rgba(14,165,233,.25);
}
.brand-text {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  white-space: nowrap;
  letter-spacing: .01em;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: .25rem;
}
.nav-link {
  position: relative;
  padding: .5rem .85rem;
  font-size: .9375rem;
  font-weight: 500;
  color: var(--text-body);
  border-radius: 8px;
  transition: color .2s ease;
}
.nav-link:hover { color: var(--primary); }
.nav-link.active { color: var(--primary); font-weight: 600; }
.nav-link.active::after {
  content: "";
  position: absolute;
  left: .85rem;
  right: .85rem;
  bottom: 2px;
  height: 2px;
  border-radius: 2px;
  background: var(--primary);
}
.nav-action {
  display: flex;
  align-items: center;
  gap: .75rem;
  flex-shrink: 0;
}
.countdown-badge {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  background: var(--navy);
  color: #fff;
  font-size: .75rem;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: 999px;
  font-variant-numeric: tabular-nums;
  letter-spacing: .04em;
}
.cd-clock { font-size: .85rem; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--r-sm);
  padding: 10px 20px;
  transition: all .2s ease;
  border: 1px solid transparent;
  line-height: 1.2;
}
.btn-sm { height: 36px; padding: 0 16px; font-size: .875rem; border-radius: 8px; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); color: #fff; transform: translateY(-1px); box-shadow: 0 6px 16px rgba(14,165,233,.3); }
.btn-text { background: transparent; color: var(--text-body); padding: 8px 10px; }
.btn-text:hover { color: var(--primary); background: rgba(14,165,233,.06); }
.btn-outline { background: #fff; color: var(--primary); border-color: var(--primary); }
.btn-outline:hover { background: rgba(14,165,233,.06); color: var(--primary-dark); border-color: var(--primary-dark); }
.btn-accent { background: var(--accent); color: #fff; min-width: 200px; height: 52px; font-size: 1.0625rem; }
.btn-accent:hover { background: var(--accent-dark); color: #fff; transform: scale(1.02); box-shadow: 0 8px 24px rgba(249,115,22,.35); }
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
}
.nav-toggle span { width: 22px; height: 2px; border-radius: 2px; background: var(--text); transition: all .3s ease; }
.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== Cat Hero ===== */
.category-hero {
  background: linear-gradient(135deg, var(--primary-light) 0%, #FFFFFF 70%);
  padding: 60px 0 64px;
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}
.category-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(14,165,233,.08) 1px, transparent 1px);
  background-size: 22px 22px;
  pointer-events: none;
}
.cat-hero-inner {
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 48px;
  align-items: center;
  position: relative;
}
.cat-hero-tag {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  font-size: .75rem;
  font-weight: 600;
  padding: 4px 14px;
  border-radius: 999px;
  margin-bottom: 18px;
}
.cat-hero-title {
  font-size: clamp(2rem, 4vw, 2.5rem);
  font-weight: 800;
  color: var(--text);
  line-height: 1.2;
  margin-bottom: 16px;
}
.cat-hero-desc {
  font-size: 1.0625rem;
  color: var(--text-body);
  max-width: 480px;
  line-height: 1.8;
}
.cat-hero-pic {
  border-radius: var(--r-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  height: 260px;
}
.cat-hero-pic img { width: 100%; height: 100%; object-fit: cover; }

/* ===== Section common ===== */
.section { padding: 80px 0; }
.section-alt { background: var(--bg); }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 44px; }
.section-tag {
  display: inline-block;
  background: rgba(14,165,233,.1);
  color: var(--primary-dark);
  font-size: .75rem;
  font-weight: 600;
  padding: 4px 14px;
  border-radius: 999px;
  margin-bottom: 12px;
}
.section-title { font-size: clamp(1.5rem, 2.5vw, 2rem); font-weight: 700; color: var(--text); line-height: 1.3; margin-bottom: 12px; }
.section-sub { font-size: .9375rem; color: var(--text-body); line-height: 1.8; }

/* ===== Intro block ===== */
.intro-block { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.intro-copy h3 { font-size: 1.375rem; font-weight: 700; color: var(--text); margin-bottom: 20px; }
.intro-copy p { font-size: 1.0625rem; line-height: 2; color: var(--text-body); margin-bottom: 16px; }
.intro-copy p:last-child { margin-bottom: 0; }
.intro-pic { border-radius: var(--r-md); overflow: hidden; box-shadow: var(--shadow-md); }
.intro-pic img { width: 100%; height: 100%; min-height: 300px; object-fit: cover; }

/* ===== Level cards ===== */
.level-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; margin-top: 40px; }
.level-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 28px 24px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}
.level-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: rgba(14,165,233,.3); }
.level-card.hot { border: 2px solid var(--primary); background: #F0F9FF; }
.level-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  font-size: 1.375rem;
  font-weight: 800;
  color: #fff;
}
.lv-1 .level-icon { background: #B45309; }
.lv-2 .level-icon { background: #94A3B8; }
.lv-3 .level-icon { background: #D97706; }
.lv-4 .level-icon { background: linear-gradient(135deg, #64748B, #0F172A); }
.level-name { font-size: 1.125rem; font-weight: 700; color: var(--text); margin-bottom: 6px; }
.level-req { font-size: .8125rem; color: var(--text-weak); margin-bottom: 14px; }
.level-feature { font-size: .875rem; color: var(--text-body); line-height: 1.7; }

/* ===== Feature cards ===== */
.feature-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px; }
.feature-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform .25s ease, box-shadow .25s ease;
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.feature-card img { width: 100%; height: 220px; object-fit: cover; }
.feature-body { padding: 28px; }
.feature-body h3 { font-size: 1.25rem; font-weight: 700; color: var(--text); margin-bottom: 10px; }
.feature-body p { font-size: .9375rem; color: var(--text-body); line-height: 1.85; }
.feature-list { margin-top: 16px; }
.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: .875rem;
  color: var(--text-body);
  padding: 4px 0;
}
.feature-list li::before {
  content: "";
  flex-shrink: 0;
  width: 16px;
  height: 16px;
  margin-top: 5px;
  border-radius: 50%;
  background: var(--success);
  mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='none' stroke='%23fff' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M3 8.5L6.5 12L13 4.5'/%3E%3C/svg%3E") center / 10px no-repeat;
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='none' stroke='%23fff' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M3 8.5L6.5 12L13 4.5'/%3E%3C/svg%3E") center / 10px no-repeat;
}

/* ===== Steps ===== */
.steps-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.step-item { position: relative; text-align: center; padding: 0 8px; }
.step-num {
  width: 48px;
  height: 48px;
  margin: 0 auto 16px;
  border-radius: 50%;
  background: var(--primary-light);
  color: var(--primary-dark);
  font-size: 1.125rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
}
.step-item::after {
  content: "";
  position: absolute;
  top: 24px;
  left: calc(50% + 36px);
  width: calc(100% - 72px);
  height: 2px;
  background: var(--border);
}
.step-item:last-child::after { display: none; }
.step-item h4 { font-size: 1rem; font-weight: 700; color: var(--text); margin-bottom: 8px; }
.step-item p { font-size: .875rem; color: var(--text-weak); line-height: 1.7; }

/* ===== FAQ ===== */
.faq-wrap { max-width: 800px; margin: 0 auto; }
.faq-item { border-bottom: 1px solid var(--border); }
.faq-item:first-child { border-top: 1px solid var(--border); }
.faq-q {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  text-align: left;
  padding: 18px 4px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  transition: color .2s ease;
}
.faq-q:hover { color: var(--primary); }
.faq-q .icon {
  flex-shrink: 0;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--primary-light);
  color: var(--primary-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.125rem;
  transition: transform .3s ease;
  margin-left: 12px;
}
.faq-item.active .faq-q .icon { transform: rotate(45deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .35s ease; }
.faq-item.active .faq-a { max-height: 300px; }
.faq-a p { padding: 0 4px 18px; font-size: .9375rem; color: var(--text-body); line-height: 1.85; }

/* ===== CTA ===== */
.cat-cta {
  background: #F0F9FF;
  border-top: 1px solid var(--border);
  padding: 48px 0;
}
.cta-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}
.cta-copy h3 { font-size: 1.375rem; font-weight: 700; color: var(--text); margin-bottom: 6px; }
.cta-copy p { font-size: .9375rem; color: var(--text-body); }

/* ===== Footer ===== */
.site-footer { background: var(--navy); color: #fff; }
.footer-inner {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 48px;
  padding: 64px 1rem;
}
.footer-logo { display: flex; align-items: center; gap: .5rem; margin-bottom: 14px; }
.footer-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: rgba(255,255,255,.14);
  display: flex;
  align-items: center;
  justify-content: center;
}
.footer-brand-name { font-size: 1.125rem; font-weight: 700; color: #fff; }
.footer-col p { font-size: .875rem; color: #E0F2FE; line-height: 1.8; opacity: .85; }
.footer-col h4 { font-size: .9375rem; font-weight: 600; color: #fff; margin-bottom: 16px; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul a { font-size: .875rem; color: #E0F2FE; opacity: .8; transition: all .2s ease; }
.footer-col ul a:hover { color: #7DD3FC; opacity: 1; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.1); padding: 18px 0; }
.footer-bottom p { font-size: .8125rem; color: #E0F2FE; opacity: .6; text-align: center; }

/* ===== Back to top ===== */
.back-top {
  position: fixed;
  right: 24px;
  bottom: 32px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all .3s ease;
  z-index: 99;
  font-size: 1.25rem;
}
.back-top.show { opacity: 1; visibility: visible; }
.back-top:hover { background: var(--primary-dark); transform: translateY(-3px); }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .main-nav { gap: .1rem; }
  .nav-link { padding: .5rem .6rem; font-size: .875rem; }
  .countdown-badge { display: none; }
  .brand-text { font-size: 1.1rem; }
  .level-grid { grid-template-columns: repeat(2, 1fr); }
  .steps-grid { grid-template-columns: repeat(2, 1fr); row-gap: 32px; }
  .step-item::after { display: none; }
  .footer-inner { grid-template-columns: 1fr 1fr; gap: 40px; }
}
@media (max-width: 768px) {
  .site-header { height: auto; min-height: 68px; }
  .nav-inner { flex-wrap: wrap; height: auto; padding: 12px 1rem; gap: .75rem; }
  .nav-toggle { display: flex; margin-left: auto; order: 3; }
  .nav-action { order: 2; margin-left: auto; gap: .5rem; }
  .nav-action .btn-text { display: none; }
  .main-nav {
    order: 4;
    flex-basis: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height .35s ease;
    background: #fff;
    border-radius: 12px;
  }
  .main-nav.open { max-height: 460px; padding: 10px 0; box-shadow: var(--shadow-md); }
  .nav-link { padding: 14px 16px; font-size: 1rem; border-radius: 10px; }
  .nav-link.active::after { display: none; }
  .nav-link.active { background: rgba(14,165,233,.08); }
  .cat-hero-inner { grid-template-columns: 1fr; gap: 32px; }
  .cat-hero-pic { height: 220px; }
  .section { padding: 56px 0; }
  .intro-block { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
  .level-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
  .steps-grid { grid-template-columns: 1fr; gap: 24px; }
  .cta-inner { flex-direction: column; text-align: center; }
  .footer-inner { grid-template-columns: 1fr; gap: 32px; padding: 48px 1rem; }
}
@media (max-width: 520px) {
  .level-grid { grid-template-columns: 1fr; }
  .feature-card img { height: 180px; }
  .feature-body { padding: 20px; }
  .btn-accent { width: 100%; }
  .brand-text { font-size: 1rem; }
  .brand-icon { width: 32px; height: 32px; }
}