/* ==========================================================================
   闪连 ShanLian - 极速轻量原生样式表 (Vanilla Pure CSS)
   特性: 纯白现代商务风格 / 左右分栏动态主视觉 / 价格真实体系 / 极速秒开
   ========================================================================== */

:root {
  --bg-main: #ffffff;
  --bg-card: #ffffff;
  --bg-card-subtle: #f8fafc;
  --bg-card-hover: #f1f5f9;
  
  --border-subtle: #e2e8f0;
  --border-strong: #cbd5e1;
  --border-focus: #2563eb;
  
  --primary: #2563eb;
  --primary-light: #3b82f6;
  --primary-glow: rgba(37, 99, 235, 0.2);
  --secondary: #0284c7;
  --accent-purple: #7c3aed;
  --accent-green: #059669;
  --accent-amber: #d97706;
  
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-dim: #64748b;
  
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05), 0 1px 2px rgba(0, 0, 0, 0.03);
  --shadow-md: 0 4px 18px -2px rgba(15, 23, 42, 0.06), 0 2px 6px -1px rgba(15, 23, 42, 0.03);
  --shadow-lg: 0 12px 32px -4px rgba(15, 23, 42, 0.09), 0 4px 10px -2px rgba(15, 23, 42, 0.04);
  --shadow-card: 0 10px 30px -5px rgba(15, 23, 42, 0.07), 0 0 0 1px rgba(226, 232, 240, 0.8);
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --container-max: 1200px;
  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  font-family: var(--font-family);
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.6;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  background-color: #ffffff;
  color: var(--text-main);
}

/* 容器与版心 */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 20px;
}

/* 顶部导航栏 (页眉导航目录) */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(255, 255, 255, 0.95);
  border-bottom: 1px solid var(--border-subtle);
  transition: var(--transition);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-main);
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: -0.5px;
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: 0 2px 10px var(--primary-glow);
}

.logo-badge {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: var(--radius-full);
  background: rgba(37, 99, 235, 0.1);
  color: var(--primary);
  border: 1px solid rgba(37, 99, 235, 0.2);
  margin-left: 6px;
}

/* 页眉主导航目录 */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 22px;
  list-style: none;
}

.nav-menu a {
  text-decoration: none;
  color: var(--text-muted);
  font-size: 0.92rem;
  font-weight: 600;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.nav-menu a:hover {
  color: var(--primary);
  background: #f1f5f9;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* 移动端专属二级目录滚动栏 */
.mobile-nav-dir {
  display: none;
  overflow-x: auto;
  white-space: nowrap;
  background: #f8fafc;
  border-bottom: 1px solid var(--border-subtle);
  padding: 8px 16px;
  -webkit-overflow-scrolling: touch;
}

.mobile-nav-dir a {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  text-decoration: none;
  margin-right: 18px;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
}

.mobile-nav-dir a:hover, .mobile-nav-dir a:active {
  color: var(--primary);
  background: #e2e8f0;
}

/* 通用按钮系统 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: var(--radius-full);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #ffffff;
  box-shadow: 0 4px 14px var(--primary-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(37, 99, 235, 0.35);
  filter: brightness(1.05);
}

.btn-secondary {
  background: #f8fafc;
  color: var(--text-main);
  border-color: var(--border-subtle);
}

.btn-secondary:hover {
  background: #f1f5f9;
  border-color: var(--border-strong);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 13px 30px;
  font-size: 1.02rem;
}

.btn-block {
  width: 100%;
}

/* ==========================================================================
   主视觉区 (Hero Section) - 左右分布商务简洁排版
   ========================================================================== */
.hero {
  padding: 60px 0 50px;
  position: relative;
  background: #ffffff;
}

.hero-layout {
  display: grid;
  grid-template-columns: 1.15fr 0.95fr;
  gap: 48px;
  align-items: center;
}

.hero-left {
  text-align: left;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: rgba(37, 99, 235, 0.08);
  border: 1px solid rgba(37, 99, 235, 0.22);
  color: var(--primary);
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 22px;
}

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

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.85); }
}

.hero-title {
  font-size: clamp(2.3rem, 4.2vw, 3.5rem);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -1.2px;
  margin-bottom: 20px;
  color: var(--text-main);
}

.gradient-text {
  background: linear-gradient(135deg, #0f172a 10%, #2563eb 65%, #0284c7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: clamp(1rem, 1.8vw, 1.15rem);
  color: var(--text-muted);
  margin-bottom: 32px;
  line-height: 1.7;
  max-width: 580px;
}

.hero-cta {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.hero-trust-tags {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-dim);
}

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

/* ==========================================================================
   右侧动态图卡 (Dynamic Graphic Card) - 商务极客监控仪
   ========================================================================== */
.hero-right {
  position: relative;
}

.dynamic-card {
  background: #ffffff;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 26px;
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
  transition: var(--transition);
}

.dynamic-card:hover {
  box-shadow: 0 16px 36px -6px rgba(15, 23, 42, 0.12), 0 0 0 1px #cbd5e1;
}

/* 动态卡片顶部栏 */
.card-top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 16px;
  margin-bottom: 20px;
}

.card-title-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.live-radar-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent-green);
  box-shadow: 0 0 0 0 rgba(5, 150, 105, 0.7);
  animation: radar-ping 2s cubic-bezier(0, 0, 0.2, 1) infinite;
}

@keyframes radar-ping {
  0% { box-shadow: 0 0 0 0 rgba(5, 150, 105, 0.7); }
  70% { box-shadow: 0 0 0 10px rgba(5, 150, 105, 0); }
  100% { box-shadow: 0 0 0 0 rgba(5, 150, 105, 0); }
}

.card-main-title {
  font-size: 0.95rem;
  font-weight: 800;
  color: var(--text-main);
}

.card-status-badge {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-green);
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  padding: 3px 10px;
  border-radius: var(--radius-full);
}

/* 动态测速仪数值看板 */
.speed-meter-box {
  background: #f8fafc;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  position: relative;
  overflow: hidden;
}

.speed-meter-left {
  display: flex;
  flex-direction: column;
}

.meter-label {
  font-size: 0.78rem;
  color: var(--text-dim);
  font-weight: 600;
  text-transform: uppercase;
}

.meter-num-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.meter-num {
  font-size: 1.85rem;
  font-weight: 900;
  color: var(--primary);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.5px;
}

.meter-unit {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-muted);
}

.speed-meter-right {
  text-align: right;
}

.latency-val {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--accent-green);
}

.latency-label {
  font-size: 0.75rem;
  color: var(--text-dim);
  font-weight: 500;
}

/* 动态波形流水线动画 */
.live-stream-bar {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, #2563eb 0%, #059669 50%, #0284c7 100%);
  background-size: 200% 100%;
  animation: stream-flow 2.5s linear infinite;
}

@keyframes stream-flow {
  0% { background-position: 100% 0; }
  100% { background-position: -100% 0; }
}

/* 实时专线节点列表 */
.nodes-monitor-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 20px;
}

.node-monitor-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background: #ffffff;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.node-monitor-item:hover {
  background: #f8fafc;
  border-color: var(--border-strong);
  transform: translateX(3px);
}

.node-item-info {
  display: flex;
  align-items: center;
  gap: 10px;
}

.node-flag {
  font-size: 1.15rem;
  line-height: 1;
}

.node-name {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-main);
}

.node-type-tag {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--primary);
  background: #eff6ff;
  padding: 2px 6px;
  border-radius: 4px;
}

.node-item-stat {
  display: flex;
  align-items: center;
  gap: 12px;
}

.node-ping {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-green);
  font-variant-numeric: tabular-nums;
}

/* 动态信号强度柱状图 */
.signal-bars {
  display: flex;
  align-items: flex-end;
  gap: 2px;
  height: 14px;
}

.signal-bar {
  width: 3px;
  background: #cbd5e1;
  border-radius: 1px;
}

.signal-bar.active {
  background: var(--accent-green);
  animation: bar-glow 1.5s infinite alternate ease-in-out;
}

.signal-bar:nth-child(1) { height: 4px; }
.signal-bar:nth-child(2) { height: 7px; animation-delay: 0.2s; }
.signal-bar:nth-child(3) { height: 11px; animation-delay: 0.4s; }
.signal-bar:nth-child(4) { height: 14px; animation-delay: 0.6s; }

@keyframes bar-glow {
  0% { opacity: 0.6; }
  100% { opacity: 1; }
}

/* 解锁服务动态状态指示 */
.card-unlock-pills {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  border-top: 1px solid var(--border-subtle);
  padding-top: 16px;
}

.unlock-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  background: #f8fafc;
  padding: 7px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
}

.unlock-pill-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-green);
}

/* 指标卡片 (Hero下方) */
.hero-metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  max-width: var(--container-max);
  margin: 45px auto 0;
  padding-top: 28px;
  border-top: 1px solid var(--border-subtle);
}

.metric-item {
  padding: 18px 12px;
  background: #ffffff;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.metric-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.metric-value {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-main);
  display: block;
  margin-bottom: 4px;
}

.metric-value.cyan { color: var(--secondary); }
.metric-value.blue { color: var(--primary); }
.metric-value.green { color: var(--accent-green); }
.metric-value.purple { color: var(--accent-purple); }

.metric-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* 通用 Section */
.section {
  padding: 75px 0;
  background-color: #ffffff;
}

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

.section-badge {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--primary);
  background: rgba(37, 99, 235, 0.08);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 14px;
  color: var(--text-main);
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 620px;
  margin: 0 auto;
}

/* 核心优势卡片 (3 Cards) */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.adv-card {
  background: #ffffff;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.adv-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-lg);
}

.adv-card-icon {
  width: 58px;
  height: 58px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
}

.icon-blue { background: rgba(37, 99, 235, 0.1); color: var(--primary); }
.icon-cyan { background: rgba(2, 132, 199, 0.1); color: var(--secondary); }
.icon-purple { background: rgba(124, 58, 237, 0.1); color: var(--accent-purple); }

.adv-card-title {
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--text-main);
}

.adv-card-text {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

.adv-card-features {
  list-style: none;
  border-top: 1px solid var(--border-subtle);
  padding-top: 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.adv-card-features li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-main);
  font-weight: 500;
}

.adv-card-features li svg {
  color: var(--accent-green);
  flex-shrink: 0;
}

/* 流媒体与 AI 支持图卡 */
.support-container {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.support-panel {
  background: #ffffff;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.support-panel:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--border-strong);
}

.support-panel-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 18px;
}

.support-panel-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.support-panel-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-main);
}

.support-panel-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 24px;
  line-height: 1.6;
}

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

.support-chip {
  background: #f8fafc;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  display: flex;
  align-items: center;
  gap: 10px;
  transition: var(--transition);
}

.support-chip:hover {
  background: #f1f5f9;
  border-color: var(--border-strong);
  transform: translateY(-2px);
}

.chip-icon {
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.chip-name {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-main);
}

.chip-tag {
  font-size: 0.72rem;
  color: var(--accent-green);
  font-weight: 600;
  display: block;
}

/* ==========================================================================
   价格对比表 (Pricing) - 真实网上主流套餐架构
   ========================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: stretch;
}

.pricing-card {
  background: #ffffff;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
  position: relative;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.pricing-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
}

.pricing-card.featured {
  border: 2px solid var(--primary);
  box-shadow: 0 8px 30px rgba(37, 99, 235, 0.12);
  transform: scale(1.02);
}

.pricing-card.featured:hover {
  transform: scale(1.02) translateY(-4px);
  box-shadow: 0 14px 38px rgba(37, 99, 235, 0.18);
}

.featured-ribbon {
  position: absolute;
  top: -13px;
  right: 24px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  font-size: 0.76rem;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  box-shadow: 0 2px 10px rgba(37, 99, 235, 0.35);
}

.pricing-badge {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 8px;
  text-transform: uppercase;
}

.pricing-title {
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--text-main);
}

.pricing-price-box {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 4px;
}

.pricing-currency {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-main);
}

.pricing-amount {
  font-size: 2.7rem;
  font-weight: 900;
  letter-spacing: -1px;
  color: var(--text-main);
}

.pricing-period {
  font-size: 0.9rem;
  color: var(--text-dim);
  font-weight: 500;
}

.pricing-discount-tag {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent-green);
  background: #f0fdf4;
  padding: 2px 8px;
  border-radius: 4px;
  margin-bottom: 12px;
}

.pricing-summary {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 24px;
  min-height: 40px;
  line-height: 1.5;
}

.pricing-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 30px;
  flex-grow: 1;
}

.pricing-features li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-main);
}

.pricing-features li svg {
  flex-shrink: 0;
  margin-top: 2px;
  color: var(--accent-green);
}

.pricing-features li.dimmed {
  color: var(--text-dim);
}

.pricing-features li.dimmed svg {
  color: var(--text-dim);
}

/* 用户评价 (Testimonials) */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: #ffffff;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.review-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.review-stars {
  display: flex;
  gap: 4px;
  color: #f59e0b;
  margin-bottom: 16px;
  font-size: 1rem;
}

.review-quote {
  font-size: 0.95rem;
  color: var(--text-main);
  line-height: 1.65;
  margin-bottom: 22px;
  flex-grow: 1;
}

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

.avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: rgba(37, 99, 235, 0.1);
  border: 1px solid rgba(37, 99, 235, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.95rem;
  color: var(--primary);
}

.author-name {
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--text-main);
}

.author-role {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* 常见问题 (FAQ) - 原生 details/summary */
.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: #ffffff;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.faq-item[open] {
  border-color: var(--primary);
  background: #f8fafc;
}

.faq-question {
  padding: 18px 22px;
  font-weight: 700;
  font-size: 1.02rem;
  color: var(--text-main);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-icon {
  width: 20px;
  height: 20px;
  transition: transform 0.25s ease;
  color: var(--text-dim);
}

.faq-item[open] .faq-icon {
  transform: rotate(180deg);
  color: var(--primary);
}

.faq-answer {
  padding: 0 22px 20px;
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* 底部行动召唤 (Bottom CTA) */
.cta-banner {
  background: linear-gradient(135deg, #eff6ff 0%, #f0fdfa 100%);
  border: 1px solid #bfdbfe;
  border-radius: var(--radius-lg);
  padding: 56px 36px;
  text-align: center;
  margin-top: 40px;
  box-shadow: var(--shadow-sm);
}

.cta-banner-title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  margin-bottom: 14px;
  color: var(--text-main);
}

.cta-banner-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 28px;
}

/* 页脚 (Footer) - 严格遵循用户规范: 只保留四个标题，纯白背景，在新窗口打开 */
.footer {
  border-top: 1px solid var(--border-subtle);
  background: #ffffff;
  padding: 40px 0 32px;
  margin-top: 60px;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.footer-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.footer-link:hover {
  color: var(--primary);
  background: #f1f5f9;
}

.footer-copy {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-dim);
}

.footer-friends {
  text-align: center;
  margin: 18px auto 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 0.88rem;
}

.footer-friends-label {
  color: var(--text-dim);
  font-weight: 500;
}

.pbn-link {
  color: #2563eb;
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition);
}

.pbn-link:hover {
  color: #1d4ed8;
  text-decoration: underline;
}

.pbn-divider {
  color: #cbd5e1;
  font-size: 0.8rem;
}

/* 内容页面专属样式 (About, Terms, Privacy, Sitemap) */
.page-hero {
  padding: 60px 0 40px;
  text-align: center;
  border-bottom: 1px solid var(--border-subtle);
  background: #ffffff;
}

.page-title {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 900;
  margin-bottom: 14px;
  color: var(--text-main);
}

.page-subtitle {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 650px;
  margin: 0 auto;
}

.page-content {
  max-width: 860px;
  margin: 40px auto 80px;
  background: #ffffff;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 44px;
  box-shadow: var(--shadow-sm);
}

.page-article h2 {
  font-size: 1.45rem;
  font-weight: 800;
  margin: 32px 0 14px;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-article h2:first-child {
  margin-top: 0;
}

.page-article h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin: 20px 0 10px;
  color: var(--primary);
}

.page-article p {
  color: var(--text-muted);
  margin-bottom: 16px;
  line-height: 1.75;
}

.page-article ul, .page-article ol {
  color: var(--text-muted);
  margin-bottom: 20px;
  padding-left: 24px;
  line-height: 1.75;
}

.page-article li {
  margin-bottom: 8px;
}

.page-callout {
  background: #eff6ff;
  border-left: 4px solid var(--primary);
  padding: 16px 20px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 24px 0;
  color: var(--text-main);
  font-size: 0.95rem;
}

.page-callout.warning {
  background: #fffbeb;
  border-left-color: var(--accent-amber);
}

.page-callout.success {
  background: #f0fdf4;
  border-left-color: var(--accent-green);
}

.sitemap-tree {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 20px;
}

.sitemap-box {
  background: #f8fafc;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 22px;
}

.sitemap-box h3 {
  font-size: 1.1rem;
  color: var(--text-main);
  font-weight: 800;
  margin-bottom: 14px;
}

.sitemap-box ul {
  list-style: none;
  padding-left: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.sitemap-box a {
  color: var(--primary);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 600;
  transition: var(--transition);
}

.sitemap-box a:hover {
  text-decoration: underline;
  color: var(--secondary);
}

/* 响应式适配 (Mobile-First / Responsive Breakpoints) */
@media (max-width: 992px) {
  .hero-layout {
    grid-template-columns: 1fr;
    gap: 36px;
  }
  
  .hero-left {
    text-align: center;
  }
  
  .hero-subtitle {
    margin-left: auto;
    margin-right: auto;
  }
  
  .hero-cta {
    justify-content: center;
  }
  
  .hero-trust-tags {
    justify-content: center;
  }

  .advantages-grid,
  .pricing-grid,
  .reviews-grid {
    grid-template-columns: 1fr;
  }
  
  .pricing-card.featured {
    transform: none;
  }
  
  .pricing-card.featured:hover {
    transform: translateY(-4px);
  }
  
  .support-container {
    grid-template-columns: 1fr;
  }
  
  .chips-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
  }
  
  .mobile-nav-dir {
    display: flex;
  }
  
  .hero {
    padding: 35px 0 35px;
  }
  
  .hero-cta {
    flex-direction: column;
    width: 100%;
  }
  
  .hero-cta .btn {
    width: 100%;
  }
  
  .hero-metrics {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .page-content {
    padding: 24px 18px;
    margin: 20px auto 50px;
  }
  
  .sitemap-tree {
    grid-template-columns: 1fr;
  }
  
  .footer-nav {
    flex-direction: column;
    gap: 14px;
  }
}

@media (max-width: 480px) {
  .card-unlock-pills {
    grid-template-columns: 1fr;
  }

  .chips-grid {
    grid-template-columns: 1fr;
  }
  
/* ==========================================================================
   SEO 文章图卡专区 (Articles Grid) & 详情页排版
   ========================================================================== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.article-card {
  background: #ffffff;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  text-decoration: none;
  color: inherit;
}

.article-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-lg);
}

.article-card-header {
  padding: 22px 24px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.article-tag {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  background: rgba(37, 99, 235, 0.08);
  color: var(--primary);
  border: 1px solid rgba(37, 99, 235, 0.18);
}

.article-tag.hot {
  background: #fef2f2;
  color: #dc2626;
  border-color: #fecaca;
}

.article-tag.guide {
  background: #f0fdf4;
  color: var(--accent-green);
  border-color: #bbf7d0;
}

.article-date {
  font-size: 0.78rem;
  color: var(--text-dim);
  font-weight: 500;
}

.article-card-body {
  padding: 16px 24px 24px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.article-card-title {
  font-size: 1.15rem;
  font-weight: 800;
  line-height: 1.45;
  color: var(--text-main);
  margin-bottom: 12px;
  transition: color 0.2s ease;
}

.article-card:hover .article-card-title {
  color: var(--primary);
}

.article-card-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 18px;
  flex-grow: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-subtle);
  padding-top: 14px;
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--primary);
}

.article-read-arrow {
  transition: transform 0.2s ease;
}

.article-card:hover .article-read-arrow {
  transform: translateX(4px);
}

/* 文章详情页专用排版 */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-dim);
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.breadcrumb a {
  color: var(--text-muted);
  text-decoration: none;
  transition: var(--transition);
}

.breadcrumb a:hover {
  color: var(--primary);
  text-decoration: underline;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 30px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-subtle);
  flex-wrap: wrap;
}

.internal-link-box {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin: 28px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.internal-link-box a.brand-link {
  color: var(--primary);
  font-weight: 800;
  text-decoration: none;
  font-size: 1.05rem;
}

.internal-link-box a.brand-link:hover {
  text-decoration: underline;
}

/* 响应式适配 */
@media (max-width: 992px) {
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

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