/* ==========================================================================
   ImmTelecom机场 - 现代浅色 SaaS 视觉设计系统 (Linear / Vercel 风格)
   背景: #fafbfc | 墨色: #0f172a | 灰字: #64748b | 渐变: #6366f1 -> #22d3ee
   ========================================================================== */

:root {
  --bg-primary: #fafbfc;
  --bg-card: #ffffff;
  --bg-subtle: #f1f5f9;
  --text-ink: #0f172a;
  --text-body: #334155;
  --text-muted: #64748b;
  --border-color: #e2e8f0;
  --border-hover: #cbd5e1;
  --accent-indigo: #6366f1;
  --accent-cyan: #22d3ee;
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #22d3ee 100%);
  --accent-gradient-soft: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(34, 211, 238, 0.1) 100%);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 10px 25px -5px rgba(15, 23, 42, 0.06), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 20px 40px -12px rgba(99, 102, 241, 0.14);
  --radius-card: 18px;
  --radius-pill: 9999px;
  --container-width: 1200px;
  --transition-base: all 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-ink);
  line-height: 1.68;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

ul, ol {
  list-style: none;
}

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

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

/* 顶部背景光晕装饰 */
.bg-glow {
  position: fixed;
  top: -180px;
  left: 50%;
  transform: translateX(-50%);
  width: 960px;
  height: 460px;
  background: radial-gradient(ellipse at center, rgba(99, 102, 241, 0.11) 0%, rgba(34, 211, 238, 0.07) 45%, transparent 75%);
  pointer-events: none;
  z-index: 0;
}

/* 渐变文字与徽章 */
.gradient-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  display: inline-block;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  background: var(--accent-gradient-soft);
  border: 1px solid rgba(99, 102, 241, 0.25);
  color: #4f46e5;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 20px;
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-gradient);
  box-shadow: 0 0 8px rgba(99, 102, 241, 0.6);
}

/* 按钮体系 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 26px;
  border-radius: 12px;
  font-size: 0.96rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-base);
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent-gradient);
  color: #ffffff;
  box-shadow: 0 6px 18px -4px rgba(99, 102, 241, 0.45);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 24px -6px rgba(99, 102, 241, 0.6);
  filter: brightness(1.04);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-ink);
  border-color: var(--border-color);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  border-color: var(--accent-indigo);
  color: var(--accent-indigo);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-ghost {
  background: transparent;
  color: var(--text-body);
  padding: 10px 18px;
}

.btn-ghost:hover {
  color: var(--accent-indigo);
  background: rgba(99, 102, 241, 0.06);
}

/* 导航栏 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 251, 252, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: var(--transition-base);
}

.site-header.scrolled {
  background: rgba(255, 255, 255, 0.94);
  border-bottom-color: var(--border-color);
  box-shadow: var(--shadow-sm);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
  gap: 16px;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-ink);
  letter-spacing: -0.02em;
}

.brand-logo-icon {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: var(--accent-gradient);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-weight: 800;
  font-size: 1rem;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.35);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-links a {
  font-size: 0.94rem;
  font-weight: 500;
  color: var(--text-muted);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-ink);
}

.nav-links a.nav-highlight {
  color: var(--accent-indigo);
  font-weight: 600;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.mobile-menu-btn {
  display: none;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 8px 12px;
  color: var(--text-ink);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
}

/* 主视觉 Hero 区 */
.hero-section {
  position: relative;
  z-index: 1;
  padding: 76px 0 64px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.12fr 0.88fr;
  gap: 48px;
  align-items: center;
}

.hero-title {
  font-size: 3.1rem;
  line-height: 1.18;
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--text-ink);
  margin-bottom: 22px;
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--text-muted);
  margin-bottom: 16px;
  font-weight: 500;
}

.hero-desc {
  font-size: 0.98rem;
  color: var(--text-muted);
  margin-bottom: 32px;
  line-height: 1.75;
}

.hero-cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 32px;
}

.hero-guarantees {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.hero-guarantees span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.check-dot {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: rgba(34, 211, 238, 0.16);
  color: #0891b2;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
}

/* 测速卡片与统计面板 */
.speedtest-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: 28px;
  box-shadow: var(--shadow-md);
  transition: var(--transition-base);
}

.speedtest-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.speedtest-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 22px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border-color);
}

.speedtest-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-ink);
}

.speedtest-node-tag {
  font-size: 0.82rem;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  background: #ecfeff;
  color: #0e7490;
  font-weight: 600;
  border: 1px solid #a5f3fc;
}

.speedtest-dial-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 12px 0 22px;
}

.speedtest-svg-box {
  position: relative;
  width: 168px;
  height: 168px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}

.speedtest-svg {
  width: 168px;
  height: 168px;
  transform: rotate(-90deg);
}

.ring-bg {
  fill: none;
  stroke: #f1f5f9;
  stroke-width: 12;
}

.ring-progress {
  fill: none;
  stroke: url(#speedGradient);
  stroke-width: 12;
  stroke-linecap: round;
  stroke-dasharray: 440;
  stroke-dashoffset: 440;
  transition: stroke-dashoffset 1.8s cubic-bezier(0.22, 1, 0.36, 1);
}

.speedtest-center-text {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.speed-main-num {
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-ink);
  line-height: 1.1;
}

.speed-main-unit {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.speedtest-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 18px;
}

.metric-box {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 12px 10px;
  text-align: center;
  transition: var(--transition-base);
}

.metric-box.pop {
  border-color: rgba(99, 102, 241, 0.4);
  background: rgba(99, 102, 241, 0.03);
  transform: scale(1.03);
}

.metric-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.metric-val {
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--text-ink);
}

/* 3项滚动计数统计栏 */
.stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 16px;
}

.stat-mini-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 16px 14px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-base);
}

.stat-mini-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-hover);
}

.stat-number {
  font-size: 1.55rem;
  font-weight: 800;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  line-height: 1.2;
}

.stat-label {
  font-size: 0.84rem;
  color: var(--text-muted);
  margin-top: 4px;
  font-weight: 500;
}

/* 社会证明文字标识条 */
.trust-strip {
  padding: 28px 0;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  background: #ffffff;
}

.trust-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.trust-caption {
  font-size: 0.88rem;
  color: var(--text-muted);
  font-weight: 600;
}

.trust-badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px 32px;
}

.trust-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.96rem;
  font-weight: 700;
  color: #475569;
  padding: 6px 14px;
  border-radius: 10px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
}

/* 通用区块排版 */
.section {
  padding: 84px 0;
  position: relative;
  z-index: 1;
}

.section-alt {
  background: #ffffff;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 54px;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--text-ink);
  letter-spacing: -0.02em;
  margin-bottom: 14px;
}

.section-subtitle {
  font-size: 1.04rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* 3张图文核心优势卡 */
.advantage-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.saas-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-base);
  display: flex;
  flex-direction: column;
}

.saas-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
  border-color: rgba(99, 102, 241, 0.35);
}

.card-illust-wrap {
  width: 100%;
  height: 170px;
  border-radius: 14px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  margin-bottom: 22px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px;
}

.card-illust-wrap img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.card-title {
  font-size: 1.24rem;
  font-weight: 700;
  color: var(--text-ink);
  margin-bottom: 12px;
}

.card-text {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.72;
}

/* 6张内联SVG图标功能卡 */
.feature-grid-6 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 32px;
}

.feature-icon-box {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--accent-gradient-soft);
  border: 1px solid rgba(99, 102, 241, 0.22);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}

.feature-icon-box img {
  width: 26px;
  height: 26px;
}

/* 流媒体与人工智能支持图卡 */
.unlock-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.unlock-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-base);
}

.unlock-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
  border-color: rgba(34, 211, 238, 0.45);
}

.unlock-banner-img {
  width: 100%;
  height: 200px;
  background: var(--bg-primary);
  border-radius: 14px;
  border: 1px solid var(--border-color);
  margin-bottom: 24px;
  padding: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.unlock-banner-img img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.unlock-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.unlock-tag {
  font-size: 0.84rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  color: var(--text-body);
}

/* 无限横向滚动全球节点 Marquee */
.marquee-wrapper {
  overflow: hidden;
  width: 100%;
  position: relative;
  padding: 14px 0;
  mask-image: linear-gradient(to right, transparent 0%, black 8%, black 92%, transparent 100%);
  -webkit-mask-image: linear-gradient(to right, transparent 0%, black 8%, black 92%, transparent 100%);
}

.marquee-track {
  display: flex;
  width: max-content;
  gap: 16px;
  animation: scrollMarquee 48s linear infinite;
}

.marquee-wrapper:hover .marquee-track {
  animation-play-state: paused;
}

@keyframes scrollMarquee {
  0% {
    transform: translateX(0);
  }
  100% {
    transform: translateX(-50%);
  }
}

.node-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-pill);
  padding: 10px 20px;
  box-shadow: var(--shadow-sm);
  white-space: nowrap;
  font-size: 0.94rem;
  font-weight: 600;
  color: var(--text-ink);
  transition: var(--transition-base);
}

.node-pill:hover {
  border-color: var(--accent-indigo);
  transform: translateY(-2px);
}

.node-status-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 8px rgba(16, 185, 129, 0.55);
}

.node-latency {
  font-size: 0.84rem;
  color: #059669;
  background: #ecfdf5;
  padding: 2px 10px;
  border-radius: var(--radius-pill);
  font-weight: 700;
}

/* 价格切换与套餐对比表 */
.billing-toggle-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  margin-bottom: 42px;
}

.billing-label {
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  transition: var(--transition-base);
}

.billing-label.active {
  color: var(--text-ink);
}

.toggle-switch {
  width: 56px;
  height: 30px;
  border-radius: var(--radius-pill);
  background: var(--accent-gradient);
  padding: 3px;
  cursor: pointer;
  position: relative;
  border: none;
  display: inline-flex;
  align-items: center;
}

.toggle-knob {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: #ffffff;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.toggle-switch.yearly .toggle-knob {
  transform: translateX(26px);
}

.discount-pill {
  background: linear-gradient(135deg, #4f46e5 0%, #0891b2 100%);
  color: #ffffff;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

.price-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: 34px 28px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-base);
  display: flex;
  flex-direction: column;
  position: relative;
}

.price-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
}

.price-card.featured {
  border: 2px solid transparent;
  background: linear-gradient(#ffffff, #ffffff) padding-box, var(--accent-gradient) border-box;
  box-shadow: var(--shadow-lg);
}

.popular-badge {
  position: absolute;
  top: -14px;
  right: 24px;
  background: var(--accent-gradient);
  color: #ffffff;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: var(--radius-pill);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.35);
}

.plan-name {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-ink);
  margin-bottom: 8px;
}

.plan-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.price-amount-box {
  margin-bottom: 24px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--border-color);
  transition: opacity 0.22s ease, transform 0.22s ease;
}

.price-amount-box.fading {
  opacity: 0;
  transform: translateY(4px);
}

.price-currency {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-ink);
  vertical-align: top;
}

.price-value {
  font-size: 2.85rem;
  font-weight: 800;
  color: var(--text-ink);
  line-height: 1;
}

.price-period {
  font-size: 0.92rem;
  color: var(--text-muted);
  font-weight: 500;
}

.price-note {
  font-size: 0.82rem;
  color: #4f46e5;
  margin-top: 6px;
  font-weight: 600;
}

.plan-features {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 13px;
  margin-bottom: 28px;
}

.plan-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.94rem;
  color: var(--text-body);
}

/* 用户评价 */
.review-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.review-stars {
  color: #f59e0b;
  font-size: 1.05rem;
  letter-spacing: 2px;
  margin-bottom: 14px;
}

.review-quote {
  font-size: 0.95rem;
  color: var(--text-body);
  line-height: 1.75;
  flex: 1;
  margin-bottom: 20px;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--border-color);
}

.author-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--accent-gradient);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
}

.author-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-ink);
}

.author-role {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* 常见问题手风琴 */
.faq-list {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-base);
}

.faq-item.open {
  border-color: rgba(99, 102, 241, 0.4);
  box-shadow: var(--shadow-md);
}

.faq-question {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 20px 24px;
  font-size: 1.04rem;
  font-weight: 700;
  color: var(--text-ink);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.faq-icon {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--bg-subtle);
  color: var(--text-ink);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  transition: transform 0.25s ease, background 0.25s ease;
  flex-shrink: 0;
}

.faq-item.open .faq-icon {
  transform: rotate(45deg);
  background: var(--accent-gradient);
  color: #ffffff;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.32s cubic-bezier(0.16, 1, 0.3, 1);
}

.faq-answer-inner {
  padding: 0 24px 22px;
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.75;
}

/* 通栏渐变 CTA 横幅 */
.cta-banner {
  background: var(--accent-gradient);
  border-radius: 24px;
  padding: 58px 40px;
  text-align: center;
  color: #ffffff;
  box-shadow: 0 20px 45px -12px rgba(99, 102, 241, 0.4);
}

.cta-banner h2 {
  font-size: 2.1rem;
  font-weight: 800;
  margin-bottom: 14px;
}

.cta-banner p {
  font-size: 1.05rem;
  opacity: 0.92;
  max-width: 640px;
  margin: 0 auto 28px;
}

.btn-white {
  background: #ffffff;
  color: #4f46e5;
  font-weight: 700;
  padding: 14px 32px;
  border-radius: 12px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

.btn-white:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.22);
}

/* 页脚（严格只保留四个链接标题） */
.site-footer {
  background: #ffffff;
  border-top: 1px solid var(--border-color);
  padding: 44px 0 36px;
  margin-top: 40px;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  text-align: center;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 32px;
}

.footer-links a {
  font-size: 0.96rem;
  font-weight: 600;
  color: var(--text-body);
}

.footer-links a:hover {
  color: var(--accent-indigo);
}

.footer-copy {
  font-size: 0.86rem;
  color: var(--text-muted);
}

/* 滚动渐显上浮动画 */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* 子页面与资讯文章通用样式 */
.page-hero {
  padding: 56px 0 36px;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
  background: #ffffff;
}

.page-hero h1 {
  font-size: 2.35rem;
  font-weight: 800;
  color: var(--text-ink);
  margin-bottom: 12px;
}

.page-hero p {
  font-size: 1.02rem;
  color: var(--text-muted);
  max-width: 720px;
  margin: 0 auto;
}

.doc-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: 40px;
  box-shadow: var(--shadow-sm);
  margin: 40px auto;
  max-width: 960px;
}

.doc-card h2 {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-ink);
  margin: 28px 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.doc-card h2:first-child {
  margin-top: 0;
}

.doc-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-ink);
  margin: 20px 0 10px;
}

.doc-card p {
  font-size: 0.98rem;
  color: var(--text-body);
  line-height: 1.82;
  margin-bottom: 14px;
}

.doc-card ul, .doc-card ol {
  margin: 12px 0 18px 20px;
  color: var(--text-body);
}

.doc-card ul li {
  list-style: disc;
  margin-bottom: 8px;
  line-height: 1.75;
}

.doc-card ol li {
  list-style: decimal;
  margin-bottom: 8px;
  line-height: 1.75;
}

/* 推荐资讯目录与文章排版 */
.toc-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin: 32px 0 48px;
}

.toc-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 20px 24px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: var(--transition-base);
}

.toc-card:hover {
  border-color: var(--accent-indigo);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.toc-num {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent-indigo);
}

.toc-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-ink);
  line-height: 1.45;
}

.seo-article {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 44px;
  box-shadow: var(--shadow-sm);
  margin-bottom: 44px;
}

.seo-article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 18px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
}

.seo-article h2 {
  font-size: 1.68rem;
  font-weight: 800;
  color: var(--text-ink);
  margin-bottom: 16px;
  line-height: 1.35;
}

.seo-article h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-ink);
  margin: 28px 0 12px;
  padding-left: 12px;
  border-left: 4px solid var(--accent-indigo);
}

.seo-article p {
  font-size: 1rem;
  color: var(--text-body);
  line-height: 1.88;
  margin-bottom: 16px;
  text-align: justify;
}

.seo-article a {
  color: var(--accent-indigo);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.seo-table-wrap {
  overflow-x: auto;
  margin: 20px 0 24px;
}

.seo-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.seo-table th, .seo-table td {
  border: 1px solid var(--border-color);
  padding: 12px 14px;
  text-align: left;
}

.seo-table th {
  background: var(--bg-subtle);
  font-weight: 700;
  color: var(--text-ink);
}

/* 响应式设计 (@media) */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }
  .advantage-grid,
  .feature-grid-6,
  .pricing-grid,
  .review-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .unlock-grid,
  .toc-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links,
  .nav-actions {
    display: none;
  }
  .mobile-menu-btn {
    display: inline-flex;
  }
  .site-header.menu-open .nav-links {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 74px;
    left: 0;
    right: 0;
    background: #ffffff;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    gap: 16px;
  }
  .site-header.menu-open .nav-actions {
    display: flex;
    position: absolute;
    top: 330px;
    left: 0;
    right: 0;
    background: #ffffff;
    padding: 12px 24px 20px;
    border-bottom: 1px solid var(--border-color);
    justify-content: center;
  }
  .hero-title {
    font-size: 2.15rem;
  }
  .section {
    padding: 56px 0;
  }
  .section-title {
    font-size: 1.75rem;
  }
  .advantage-grid,
  .feature-grid-6,
  .pricing-grid,
  .review-grid,
  .stats-row {
    grid-template-columns: 1fr;
  }
  .hero-cta-row .btn {
    width: 100%;
  }
  .doc-card,
  .seo-article {
    padding: 24px 18px;
  }
  .cta-banner {
    padding: 40px 20px;
  }
  .cta-banner h2 {
    font-size: 1.6rem;
  }
}