/* ==========================================================================
   网际快车 (Flash NetExpress) - 未来超导极简风 (Supersonic Minimalist / Linear)
   设计规范：深曜冷空 | 冰点电光蓝 | 1px 微发光超导边框 | 极致克制的高性能科技感
   ========================================================================== */

/* --- 核心变量系统 --- */
:root {
  /* 基础暗曜画板 */
  --bg-dark: #08090d;
  --bg-dark-secondary: #0c0e14;
  --bg-card: rgba(14, 18, 28, 0.65);
  --bg-card-hover: rgba(20, 26, 42, 0.85);
  --bg-glass: rgba(8, 9, 13, 0.82);
  
  /* 超精细 1px 微发光边框 */
  --border-color: rgba(255, 255, 255, 0.07);
  --border-highlight: rgba(255, 255, 255, 0.14);
  --border-glow: rgba(56, 189, 248, 0.4);
  --border-active: #38bdf8;

  /* 冰点超导色谱 */
  --primary: #38bdf8;
  --primary-deep: #0284c7;
  --primary-glow: rgba(56, 189, 248, 0.28);
  --secondary: #6366f1;
  --accent: #8b5cf6;
  --success: #10b981;
  --warning: #f59e0b;

  /* 高对比排版文字阶梯 */
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --text-dark: #334155;

  /* 字体与排版 */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  --font-mono: "JetBrains Mono", Consolas, "Fira Code", Monaco, monospace;
  
  /* 物理动效与几何圆角 */
  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;
  --max-width: 1200px;
}

/* --- 全局底层与超导微网格画布 --- */
*, *::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: var(--font-family);
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.65;
  overflow-x: hidden;
  position: relative;
  /* Linear 标志性微弱网格 + 顶部超导流光聚光灯 */
  background-image: 
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(56, 189, 248, 0.12) 0%, transparent 70%),
    radial-gradient(circle at 85% 60%, rgba(99, 102, 241, 0.06) 0%, transparent 45%),
    linear-gradient(to right, rgba(255, 255, 255, 0.015) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.015) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 48px 48px, 48px 48px;
}

/* 链接与排版基础 */
a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

img, svg {
  display: block;
}

ul {
  list-style: none;
}

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

/* 渐变标题文字 */
.text-gradient {
  background: linear-gradient(180deg, #ffffff 0%, #cbd5e1 50%, #94a3b8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.text-gradient-cyan {
  background: linear-gradient(135deg, #38bdf8 0%, #818cf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* --- Linear 风格精密按钮组件 --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  border-radius: var(--radius-full);
  cursor: pointer;
  padding: 11px 24px;
  font-size: 0.93rem;
  border: 1px solid transparent;
  transition: var(--transition);
  text-align: center;
  white-space: nowrap;
  letter-spacing: -0.01em;
}

/* 主行动按钮：高光微晶电光蓝，带上边微反光 */
.btn-primary {
  background: linear-gradient(180deg, #38bdf8 0%, #0284c7 100%);
  color: #ffffff;
  border: 1px solid rgba(56, 189, 248, 0.6);
  box-shadow: 
    inset 0 1px 0 rgba(255, 255, 255, 0.35),
    0 2px 8px rgba(2, 132, 199, 0.4),
    0 8px 24px rgba(56, 189, 248, 0.25);
}

.btn-primary:hover {
  transform: translateY(-1.5px);
  background: linear-gradient(180deg, #7dd3fc 0%, #0369a1 100%);
  box-shadow: 
    inset 0 1px 0 rgba(255, 255, 255, 0.45),
    0 4px 14px rgba(2, 132, 199, 0.5),
    0 12px 32px rgba(56, 189, 248, 0.4);
}

/* 次级按钮：半透微晶面板 */
.btn-secondary {
  background: rgba(255, 255, 255, 0.04);
  color: #f1f5f9;
  border: 1px solid var(--border-color);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.2);
  color: #ffffff;
  transform: translateY(-1.5px);
}

.btn-outline {
  background: rgba(56, 189, 248, 0.03);
  color: #38bdf8;
  border: 1px solid rgba(56, 189, 248, 0.3);
}

.btn-outline:hover {
  background: rgba(56, 189, 248, 0.1);
  border-color: #38bdf8;
  box-shadow: 0 0 16px rgba(56, 189, 248, 0.25);
  transform: translateY(-1.5px);
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  padding: 8px 16px;
}

.btn-ghost:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.05);
}

.btn-sm {
  padding: 7px 16px;
  font-size: 0.84rem;
}

.btn-lg {
  padding: 13px 32px;
  font-size: 1.02rem;
}

.btn-block {
  width: 100%;
}

/* --- 顶部超导极简导航栏 --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 999;
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand-icon {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: linear-gradient(180deg, #38bdf8 0%, #0284c7 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.25);
  box-shadow: 0 2px 10px rgba(56, 189, 248, 0.3);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  position: relative;
  letter-spacing: -0.01em;
}

.nav-link:hover, .nav-link.active {
  color: #ffffff;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0%;
  height: 1.5px;
  background: var(--primary);
  transition: width 0.25s ease;
}

.nav-link:hover::after, .nav-link.active::after {
  width: 100%;
}

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

.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--text-main);
}

/* --- 通用区块规范 --- */
.section {
  padding: 95px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 740px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 14px;
  background: rgba(56, 189, 248, 0.06);
  color: var(--primary);
  border: 1px solid rgba(56, 189, 248, 0.2);
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.section-title {
  font-size: 2.35rem;
  font-weight: 800;
  line-height: 1.22;
  margin-bottom: 16px;
  letter-spacing: -0.03em;
}

.section-desc {
  font-size: 1.02rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* --- 首屏 Hero 区域 (Linear 聚光灯居中视觉) --- */
.hero-section {
  padding-top: 160px;
  padding-bottom: 105px;
  text-align: center;
  position: relative;
}

.hero-badge-wrap {
  margin-bottom: 24px;
}

/* Linear 标志性药丸胶囊微光徽章 */
.promo-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 16px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-full);
  color: #f8fafc;
  font-size: 0.86rem;
  font-weight: 500;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.1), 0 4px 16px rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(12px);
}

.promo-badge svg {
  color: #38bdf8;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 22px;
  letter-spacing: -0.035em;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 800px;
  margin: 0 auto 36px;
  line-height: 1.75;
  letter-spacing: -0.01em;
}

.hero-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 56px;
}

/* 信任指标面板 (微发光 Bento 布局) */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  max-width: 940px;
  margin: 0 auto;
  padding: 22px 20px;
  background: linear-gradient(180deg, rgba(16, 21, 33, 0.5) 0%, rgba(10, 13, 20, 0.7) 100%);
  border: 1px solid var(--border-color);
  border-top: 1px solid var(--border-highlight);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(16px);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.4);
}

.stat-item {
  text-align: center;
  border-right: 1px solid rgba(255, 255, 255, 0.05);
}

.stat-item:last-child {
  border-right: none;
}

.stat-num {
  font-size: 1.75rem;
  font-weight: 800;
  color: #ffffff;
  display: block;
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: 0.82rem;
  color: var(--text-dim);
  font-weight: 500;
  margin-top: 4px;
}

/* --- 核心优势图卡区 (Bento Grid 表面) --- */
.cards-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 30px;
}

.feature-card {
  background: linear-gradient(180deg, rgba(16, 21, 33, 0.55) 0%, rgba(9, 12, 19, 0.75) 100%);
  border: 1px solid var(--border-color);
  border-top: 1px solid var(--border-highlight);
  border-radius: var(--radius-lg);
  padding: 34px 28px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(12px);
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(56, 189, 248, 0.35);
  border-top-color: rgba(56, 189, 248, 0.6);
  background: linear-gradient(180deg, rgba(20, 26, 42, 0.7) 0%, rgba(12, 16, 26, 0.9) 100%);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.5), 0 0 24px rgba(56, 189, 248, 0.1);
}

.feature-icon-box {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: rgba(56, 189, 248, 0.08);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  border: 1px solid rgba(56, 189, 248, 0.2);
}

.feature-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.015em;
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.93rem;
  line-height: 1.65;
}

/* 流媒体与 AI 支持图卡 (大型全景 Bento 卡片) */
.media-ai-card {
  background: linear-gradient(180deg, rgba(18, 23, 38, 0.65) 0%, rgba(10, 13, 22, 0.85) 100%);
  border: 1px solid var(--border-color);
  border-top: 1px solid var(--border-highlight);
  border-radius: var(--radius-lg);
  padding: 38px;
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(12px);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.4);
}

.media-ai-content {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.media-ai-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.media-ai-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 14px;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.25);
  color: #34d399;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 600;
}

.media-ai-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.service-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 15px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.86rem;
  font-weight: 500;
  color: #e2e8f0;
  transition: var(--transition);
}

.service-pill:hover {
  background: rgba(255, 255, 255, 0.07);
  border-color: rgba(56, 189, 248, 0.35);
  color: #ffffff;
  transform: translateY(-1.5px);
}

.pill-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 6px rgba(16, 185, 129, 0.6);
}

/* --- 定价卡片区 (Linear 风格阶梯架构) --- */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
  align-items: stretch;
}

.pricing-card {
  background: linear-gradient(180deg, rgba(15, 19, 30, 0.6) 0%, rgba(9, 11, 18, 0.8) 100%);
  border: 1px solid var(--border-color);
  border-top: 1px solid var(--border-highlight);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition);
  backdrop-filter: blur(12px);
}

.pricing-card:hover {
  transform: translateY(-4px);
  border-color: rgba(56, 189, 248, 0.3);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
}

/* VIP2 推荐突出卡片 (Linear 标志性高光边框) */
.pricing-card.featured {
  background: linear-gradient(180deg, rgba(18, 27, 48, 0.75) 0%, rgba(10, 15, 28, 0.9) 100%);
  border: 1px solid #38bdf8;
  border-top: 1.5px solid #7dd3fc;
  box-shadow: 0 0 32px rgba(56, 189, 248, 0.18), 0 20px 40px rgba(0, 0, 0, 0.6);
  transform: scale(1.02);
}

.pricing-card.featured:hover {
  transform: scale(1.02) translateY(-4px);
  box-shadow: 0 0 40px rgba(56, 189, 248, 0.28), 0 24px 48px rgba(0, 0, 0, 0.65);
}

.badge-featured {
  position: absolute;
  top: -13px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(180deg, #38bdf8 0%, #0284c7 100%);
  color: #fff;
  font-size: 0.76rem;
  font-weight: 700;
  padding: 4px 16px;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: 1px solid rgba(255, 255, 255, 0.25);
  box-shadow: 0 2px 10px rgba(56, 189, 248, 0.35);
}

.plan-header {
  margin-bottom: 22px;
}

.plan-name {
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 6px;
  letter-spacing: -0.02em;
}

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

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 3px;
  margin: 18px 0 22px;
}

.plan-currency {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
}

.plan-price {
  font-size: 2.85rem;
  font-weight: 900;
  line-height: 1;
  color: #ffffff;
  letter-spacing: -0.04em;
}

.plan-period {
  font-size: 0.85rem;
  color: var(--text-dim);
}

.plan-traffic-badge {
  display: inline-block;
  padding: 5px 12px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.88rem;
  color: #38bdf8;
  margin-bottom: 22px;
}

.plan-features {
  flex-grow: 1;
  margin-bottom: 28px;
}

.plan-features li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.9rem;
  color: #cbd5e1;
  margin-bottom: 13px;
  line-height: 1.5;
}

.check-icon {
  width: 17px;
  height: 17px;
  flex-shrink: 0;
  color: var(--primary);
  margin-top: 2px;
}

/* --- 深度特性解析区 --- */
.why-row {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 48px;
  align-items: center;
  margin-bottom: 75px;
}

.why-row.reverse {
  grid-template-columns: 1.15fr 1fr;
}

.why-row:last-child {
  margin-bottom: 0;
}

.why-content h3 {
  font-size: 2.05rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 16px;
  letter-spacing: -0.025em;
}

.why-content p {
  color: var(--text-muted);
  font-size: 0.98rem;
  line-height: 1.75;
  margin-bottom: 20px;
}

.why-bullets {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.why-bullet-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.93rem;
  color: #e2e8f0;
}

.bullet-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 8px var(--primary);
}

/* 动态数据面板 */
.data-panel-card {
  background: linear-gradient(180deg, rgba(16, 22, 34, 0.7) 0%, rgba(9, 12, 20, 0.9) 100%);
  border: 1px solid var(--border-color);
  border-top: 1px solid var(--border-highlight);
  border-radius: var(--radius-lg);
  padding: 26px;
  box-shadow: 0 16px 45px rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(16px);
}

.data-panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 22px;
  padding-bottom: 15px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.node-status-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  color: #10b981;
  font-weight: 600;
}

.live-indicator {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 8px #10b981;
  animation: pulse-live 1.8s infinite;
}

@keyframes pulse-live {
  0% { transform: scale(0.95); opacity: 0.7; }
  50% { transform: scale(1.2); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.7; }
}

.data-metrics-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-bottom: 18px;
}

.metric-box {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-md);
  padding: 14px 16px;
}

.metric-label {
  font-size: 0.75rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}

.metric-val {
  font-size: 1.45rem;
  font-weight: 800;
  color: #ffffff;
  letter-spacing: -0.02em;
}

.speed-meter-bar {
  margin-top: 12px;
  height: 5px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 3px;
  overflow: hidden;
}

.speed-meter-progress {
  width: 94%;
  height: 100%;
  background: linear-gradient(90deg, #38bdf8, #818cf8);
  border-radius: 3px;
}

/* 极客风格终端代码块 (macOS / Linear 质感) */
.terminal-card {
  background: #05070a;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-top: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--radius-md);
  box-shadow: 0 16px 45px rgba(0, 0, 0, 0.6);
  overflow: hidden;
  font-family: var(--font-mono);
}

.terminal-header {
  background: #0c0f17;
  padding: 11px 16px;
  display: flex;
  align-items: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.terminal-buttons {
  display: flex;
  gap: 7px;
}

.terminal-btn {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.btn-close { background: #ef4444; }
.btn-min { background: #f59e0b; }
.btn-max { background: #10b981; }

.terminal-title {
  margin-left: 14px;
  font-size: 0.76rem;
  color: var(--text-dim);
}

.terminal-body {
  padding: 20px 22px;
  font-size: 0.84rem;
  line-height: 1.75;
  color: #e2e8f0;
}

.term-cmd { color: #38bdf8; font-weight: 600; }
.term-prompt { color: #10b981; }
.term-pass { color: #34d399; font-weight: 500; }
.term-info { color: #94a3b8; }
.term-success { color: #38bdf8; font-weight: 700; margin-top: 8px; }

.term-cursor {
  display: inline-block;
  width: 7px;
  height: 14px;
  background: #38bdf8;
  vertical-align: middle;
  margin-left: 4px;
  animation: blink 1s infinite;
}

@keyframes blink {
  0%, 49% { opacity: 1; }
  50%, 100% { opacity: 0; }
}

/* --- 用户评价跑马灯区 --- */
.testimonials-section {
  overflow: hidden;
}

.marquee-wrapper {
  display: flex;
  width: 100%;
  overflow: hidden;
  user-select: none;
  mask-image: linear-gradient(to right, transparent, black 12%, black 88%, transparent);
  -webkit-mask-image: linear-gradient(to right, transparent, black 12%, black 88%, transparent);
  padding: 12px 0;
}

.marquee-track {
  display: flex;
  gap: 20px;
  flex-shrink: 0;
  animation: marquee-scroll 42s linear infinite;
}

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

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

.testimonial-card {
  width: 350px;
  background: linear-gradient(180deg, rgba(16, 21, 33, 0.6) 0%, rgba(9, 12, 19, 0.8) 100%);
  border: 1px solid var(--border-color);
  border-top: 1px solid var(--border-highlight);
  border-radius: var(--radius-md);
  padding: 24px;
  flex-shrink: 0;
  backdrop-filter: blur(12px);
  transition: var(--transition);
}

.testimonial-card:hover {
  border-color: rgba(56, 189, 248, 0.35);
  transform: translateY(-3px);
}

.stars {
  color: #fbbf24;
  display: flex;
  gap: 3px;
  margin-bottom: 12px;
  font-size: 0.85rem;
}

.testimonial-text {
  font-size: 0.9rem;
  color: #cbd5e1;
  line-height: 1.65;
  margin-bottom: 16px;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.author-avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: linear-gradient(180deg, #38bdf8 0%, #0284c7 100%);
  color: #fff;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
}

.author-info h4 {
  font-size: 0.92rem;
  font-weight: 700;
}

.author-info span {
  font-size: 0.76rem;
  color: var(--text-dim);
}

/* --- 常见问题解答区 (FAQ) --- */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: linear-gradient(180deg, rgba(15, 19, 30, 0.5) 0%, rgba(9, 11, 18, 0.7) 100%);
  border: 1px solid var(--border-color);
  border-top: 1px solid var(--border-highlight);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
  backdrop-filter: blur(12px);
}

.faq-item:hover {
  border-color: rgba(56, 189, 248, 0.25);
}

.faq-item[open] {
  border-color: rgba(56, 189, 248, 0.35);
  background: linear-gradient(180deg, rgba(18, 25, 42, 0.75) 0%, rgba(10, 14, 24, 0.85) 100%);
}

.faq-summary {
  padding: 20px 24px;
  font-size: 1.02rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
  list-style: none;
  letter-spacing: -0.01em;
}

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

.faq-arrow {
  width: 18px;
  height: 18px;
  transition: transform 0.25s ease;
  color: var(--primary);
  flex-shrink: 0;
}

.faq-item[open] .faq-arrow {
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 24px 20px;
  font-size: 0.93rem;
  color: var(--text-muted);
  line-height: 1.7;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  margin-top: 4px;
  padding-top: 14px;
}

/* --- 底部转化区 (Linear Bento 聚焦横幅) --- */
.cta-section {
  padding: 70px 0 100px;
}

.cta-banner {
  background: linear-gradient(180deg, rgba(18, 25, 42, 0.7) 0%, rgba(9, 12, 20, 0.9) 100%);
  border: 1px solid var(--border-color);
  border-top: 1.5px solid var(--primary);
  border-radius: var(--radius-lg);
  padding: 64px 36px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5), 0 0 30px rgba(56, 189, 248, 0.12);
  backdrop-filter: blur(16px);
}

.cta-banner h2 {
  font-size: 2.45rem;
  font-weight: 800;
  margin-bottom: 14px;
  letter-spacing: -0.03em;
}

.cta-banner p {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 620px;
  margin: 0 auto 34px;
}

.cta-buttons {
  display: flex;
  justify-content: center;
  align-items: center;
}

/* --- 页脚 (严格保留四个标题) --- */
.footer {
  background: #050609;
  border-top: 1px solid var(--border-color);
  padding: 38px 0 32px;
  text-align: center;
}

.footer-nav {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 36px;
  flex-wrap: wrap;
  margin-bottom: 22px;
}

.footer-nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: var(--transition);
}

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

.footer-copy {
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* --- 子页面专用文章排版 --- */
.page-container {
  max-width: 860px;
  margin: 110px auto 80px;
  padding: 0 24px;
}

.page-header {
  margin-bottom: 36px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--border-color);
}

.page-title {
  font-size: 2.4rem;
  font-weight: 800;
  margin-bottom: 10px;
  letter-spacing: -0.03em;
}

.page-subtitle {
  color: var(--text-muted);
  font-size: 0.98rem;
}

.page-article {
  background: linear-gradient(180deg, rgba(16, 21, 33, 0.6) 0%, rgba(9, 12, 19, 0.8) 100%);
  border: 1px solid var(--border-color);
  border-top: 1px solid var(--border-highlight);
  border-radius: var(--radius-lg);
  padding: 40px;
  line-height: 1.8;
  color: #cbd5e1;
}

.page-article h2 {
  font-size: 1.4rem;
  color: #ffffff;
  margin: 30px 0 14px;
  display: flex;
  align-items: center;
  gap: 10px;
  letter-spacing: -0.02em;
}

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

.page-article p {
  margin-bottom: 16px;
}

.page-article ul, .page-article ol {
  margin: 0 0 20px 24px;
}

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

.page-back-nav {
  margin-top: 36px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* --- 推荐资讯与深度文章流 (Insights) --- */
.insights-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 36px;
  margin-top: 40px;
  align-items: start;
}

.insights-sidebar {
  position: sticky;
  top: 96px;
  background: linear-gradient(180deg, rgba(16, 21, 33, 0.6) 0%, rgba(9, 12, 19, 0.8) 100%);
  border: 1px solid var(--border-color);
  border-top: 1px solid var(--border-highlight);
  border-radius: var(--radius-lg);
  padding: 24px;
  backdrop-filter: blur(16px);
}

.sidebar-title {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--primary);
}

.article-nav-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.article-nav-link {
  font-size: 0.86rem;
  color: var(--text-muted);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  display: block;
  line-height: 1.45;
  border-left: 2px solid transparent;
}

.article-nav-link:hover,
.article-nav-link.active {
  color: #ffffff;
  background: rgba(56, 189, 248, 0.08);
  border-left-color: var(--primary);
}

.articles-stream {
  display: flex;
  flex-direction: column;
  gap: 55px;
}

.seo-article-card {
  background: linear-gradient(180deg, rgba(16, 21, 33, 0.6) 0%, rgba(9, 12, 19, 0.85) 100%);
  border: 1px solid var(--border-color);
  border-top: 1px solid var(--border-highlight);
  border-radius: var(--radius-lg);
  padding: 42px 36px;
  backdrop-filter: blur(16px);
  position: relative;
  transition: var(--transition);
}

.seo-article-card:hover {
  border-color: rgba(56, 189, 248, 0.35);
  box-shadow: 0 16px 45px rgba(0, 0, 0, 0.5);
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
  flex-wrap: wrap;
  font-size: 0.8rem;
  color: var(--text-dim);
}

.article-badge {
  background: rgba(56, 189, 248, 0.1);
  color: var(--primary);
  border: 1px solid rgba(56, 189, 248, 0.25);
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-weight: 600;
}

.article-badge.brand-badge {
  background: rgba(139, 92, 246, 0.12);
  color: #c084fc;
  border-color: rgba(139, 92, 246, 0.3);
}

.article-heading {
  font-size: 1.8rem;
  font-weight: 800;
  line-height: 1.35;
  margin-bottom: 18px;
  color: #ffffff;
  letter-spacing: -0.025em;
}

.article-body {
  font-size: 0.96rem;
  line-height: 1.85;
  color: #cbd5e1;
}

.article-body h2 {
  font-size: 1.35rem;
  font-weight: 700;
  color: #ffffff;
  margin: 32px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  display: flex;
  align-items: center;
  gap: 8px;
}

.article-body h3 {
  font-size: 1.12rem;
  font-weight: 600;
  color: #e2e8f0;
  margin: 22px 0 12px;
}

.article-body p {
  margin-bottom: 16px;
}

.article-body ul, .article-body ol {
  margin: 0 0 20px 24px;
}

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

.article-body strong {
  color: #ffffff;
}

.article-callout {
  background: rgba(56, 189, 248, 0.05);
  border-left: 3px solid var(--primary);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 22px 0;
  color: #e0f2fe;
}

.article-table-wrap {
  overflow-x: auto;
  margin: 22px 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.seo-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  text-align: left;
}

.seo-table th {
  background: rgba(255, 255, 255, 0.04);
  padding: 13px 16px;
  font-weight: 700;
  color: #ffffff;
  border-bottom: 1px solid var(--border-color);
}

.seo-table td {
  padding: 12px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
  color: #cbd5e1;
}

.seo-table tr:hover td {
  background: rgba(255, 255, 255, 0.02);
}

.seo-link {
  color: #38bdf8;
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: var(--transition);
}

.seo-link:hover {
  color: #7dd3fc;
  text-shadow: 0 0 8px rgba(56, 189, 248, 0.5);
}

.article-footer-cta {
  margin-top: 30px;
  padding: 20px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px dashed rgba(56, 189, 248, 0.3);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

/* --- 响应式适配规范 --- */
@media (max-width: 1024px) {
  .cards-grid-3,
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .pricing-card.featured {
    transform: none;
  }
  .pricing-card.featured:hover {
    transform: translateY(-4px);
  }
  
  .why-row,
  .why-row.reverse {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .insights-layout {
    grid-template-columns: 1fr;
  }
  .insights-sidebar {
    position: static;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: #08090d;
    flex-direction: column;
    padding: 24px;
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.8);
  }

  .nav-links.active {
    display: flex;
  }

  .menu-toggle {
    display: block;
  }

  .nav-actions {
    display: none;
  }

  .hero-title {
    font-size: 2.35rem;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
  }

  .stat-item:nth-child(2) {
    border-right: none;
  }

  .cards-grid-3,
  .pricing-grid {
    grid-template-columns: 1fr;
  }

  .section-title {
    font-size: 1.85rem;
  }

  .cta-banner {
    padding: 42px 20px;
  }

  .cta-banner h2 {
    font-size: 1.8rem;
  }

  .footer-nav {
    gap: 20px;
  }
  
  .page-article {
    padding: 24px 18px;
  }
  
  .page-title {
    font-size: 1.9rem;
  }
}