/* ==========================================================================
   宝云机场 BAOYUN CLOUD - 洲海缆流 (Deep Sea Fiber) 主题样式
   主色调：
   - 主背景: #030712
   - 渐变主色: #0891B2 -> #06B6D4
   - 核心 CTA: #38BDF8
   - 边框质感: #1E293B
   - 文字色彩: #F0FDF4 (高亮冷白), #94A3B8 (正文), #64748B (辅助文字)
   ========================================================================== */

:root {
  --bg-deep-abyss: #030712;
  --bg-card: rgba(8, 20, 42, 0.65);
  --bg-card-hover: rgba(14, 34, 68, 0.85);
  --border-subtle: #1E293B;
  --border-glow: rgba(56, 189, 248, 0.35);
  --cyan-primary: #0891B2;
  --cyan-bright: #06B6D4;
  --cyan-light: #22D3EE;
  --cta-sky: #38BDF8;
  --cta-sky-hover: #7DD3FC;
  --text-white: #F0FDF4;
  --text-muted: #94A3B8;
  --text-subtle: #64748B;
  --accent-green: #10B981;
  --accent-amber: #F59E0B;
  --shadow-glow: 0 0 25px rgba(56, 189, 248, 0.25);
  --shadow-cyan: 0 10px 30px -10px rgba(6, 182, 212, 0.4);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  --max-width: 1240px;
}

/* Reset & Box Sizing */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  font-size: 16px;
  background-color: var(--bg-deep-abyss);
  color: var(--text-muted);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
}

body {
  position: relative;
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.65;
  background-color: var(--bg-deep-abyss);
  background-image: 
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(8, 145, 178, 0.22), transparent 70%),
    radial-gradient(circle at 15% 35%, rgba(6, 182, 212, 0.08), transparent 40%),
    radial-gradient(circle at 85% 65%, rgba(56, 189, 248, 0.08), transparent 45%);
}

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.25s ease;
}

ul, ol {
  list-style: none;
}

button, input {
  font-family: inherit;
  border: none;
  outline: none;
}

img, svg {
  vertical-align: middle;
}

/* Background Canvas */
#ocean-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 0;
  opacity: 0.85;
}

/* Page Container */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
  position: relative;
  z-index: 1;
}

/* Section Common Styling */
.section-pad {
  padding-top: 100px;
  padding-bottom: 100px;
  position: relative;
  z-index: 1;
}

@media (max-width: 768px) {
  .section-pad {
    padding-top: 70px;
    padding-bottom: 70px;
  }
}

.section-header {
  text-align: center;
  max-width: 780px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: rgba(8, 145, 178, 0.15);
  border: 1px solid rgba(6, 182, 212, 0.3);
  border-radius: var(--radius-full);
  color: var(--cyan-light);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 16px;
  backdrop-filter: blur(8px);
}

.section-tag .pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cta-sky);
  box-shadow: 0 0 10px var(--cta-sky);
  animation: pulse-dot 2s infinite ease-in-out;
}

.section-title {
  font-size: 2.35rem;
  font-weight: 800;
  color: var(--text-white);
  line-height: 1.25;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.section-title .text-gradient {
  background: linear-gradient(135deg, var(--text-white) 30%, var(--cta-sky) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* Glow Badges & Accents */
.badge-optic {
  background: linear-gradient(90deg, rgba(8, 145, 178, 0.25), rgba(6, 182, 212, 0.15));
  border: 1px solid var(--border-glow);
  color: var(--cta-sky);
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 600;
}

/* ==========================================================================
   Navigation Bar
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(3, 7, 18, 0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(30, 41, 59, 0.8);
  transition: all 0.3s ease;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--cyan-primary), var(--cyan-bright));
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 16px rgba(6, 182, 212, 0.4);
  color: #fff;
}

.brand-name {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-white);
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: 6px;
}

.brand-sub {
  font-size: 0.68rem;
  color: var(--cyan-light);
  font-weight: 600;
  letter-spacing: 0.12em;
}

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

.nav-link {
  font-size: 0.92rem;
  font-weight: 500;
  color: #CBD5E1;
  position: relative;
  padding: 8px 0;
  transition: color 0.25s ease;
}

.nav-link:hover, .nav-link.active {
  color: var(--cta-sky);
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan-primary), var(--cta-sky));
  transition: width 0.25s ease;
  border-radius: 2px;
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.btn-cta-nav {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 20px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--cyan-primary), var(--cta-sky));
  color: #030712;
  font-size: 0.88rem;
  font-weight: 700;
  box-shadow: 0 0 18px rgba(56, 189, 248, 0.35);
  transition: all 0.3s ease;
}

.btn-cta-nav:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 26px rgba(56, 189, 248, 0.55);
  background: linear-gradient(135deg, var(--cyan-bright), var(--cta-sky-hover));
}

.mobile-toggle {
  display: none;
  background: transparent;
  color: var(--text-white);
  padding: 8px;
  cursor: pointer;
  border-radius: 6px;
  border: 1px solid var(--border-subtle);
}

/* ==========================================================================
   Hero Section & Top Ad Banner
   ========================================================================== */
.hero-section {
  padding-top: 50px;
  padding-bottom: 80px;
  position: relative;
  overflow: hidden;
}

.top-ad-banner {
  background: linear-gradient(90deg, rgba(8, 145, 178, 0.2), rgba(6, 182, 212, 0.3), rgba(8, 145, 178, 0.2));
  border: 1px solid rgba(56, 189, 248, 0.35);
  border-radius: var(--radius-full);
  padding: 10px 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin: 0 auto 36px;
  max-width: 820px;
  box-shadow: 0 0 30px rgba(6, 182, 212, 0.15);
  backdrop-filter: blur(12px);
}

.ad-badge {
  background: var(--cta-sky);
  color: #030712;
  font-size: 0.72rem;
  font-weight: 800;
  padding: 3px 8px;
  border-radius: 4px;
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.ad-text {
  font-size: 0.92rem;
  color: var(--text-white);
  font-weight: 500;
}

.ad-text strong {
  color: var(--cta-sky);
  font-weight: 700;
}

.hero-main {
  text-align: center;
  max-width: 960px;
  margin: 0 auto;
}

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

.hero-title {
  font-size: 3.6rem;
  font-weight: 900;
  line-height: 1.15;
  color: var(--text-white);
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, #FFFFFF 20%, var(--cyan-light) 65%, var(--cta-sky) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: #CBD5E1;
  max-width: 780px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.hero-subtitle strong {
  color: var(--cta-sky);
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin-bottom: 50px;
  flex-wrap: wrap;
}

.btn-hero-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 36px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, #0891B2, #38BDF8);
  color: #030712;
  font-size: 1.1rem;
  font-weight: 800;
  box-shadow: 0 0 35px rgba(56, 189, 248, 0.45);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.btn-hero-primary::after {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  transition: left 0.75s ease;
}

.btn-hero-primary:hover::after {
  left: 100%;
}

.btn-hero-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 50px rgba(56, 189, 248, 0.65);
}

.btn-hero-secondary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 32px;
  border-radius: var(--radius-full);
  background: rgba(15, 23, 42, 0.7);
  border: 1px solid var(--border-glow);
  color: var(--text-white);
  font-size: 1.05rem;
  font-weight: 600;
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
}

.btn-hero-secondary:hover {
  background: rgba(30, 41, 59, 0.85);
  border-color: var(--cta-sky);
  color: var(--cta-sky);
  transform: translateY(-2px);
}

/* Hero Stats Grid */
.hero-stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 20px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 22px 18px;
  text-align: center;
  backdrop-filter: blur(12px);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--cyan-bright), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

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

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

.stat-value {
  font-size: 2.1rem;
  font-weight: 900;
  color: var(--text-white);
  line-height: 1.1;
  margin-bottom: 6px;
  letter-spacing: -0.02em;
}

.stat-value span {
  color: var(--cta-sky);
}

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

/* ==========================================================================
   Section 3: Node Latency & Status Board (节点延迟和状态板块)
   ========================================================================== */
.status-panel-wrap {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px;
  backdrop-filter: blur(16px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.status-top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 16px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-subtle);
}

.status-meta {
  display: flex;
  align-items: center;
  gap: 18px;
}

.status-live-indicator {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--accent-green);
  font-weight: 600;
}

.status-live-indicator .pulse-ring {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent-green);
  box-shadow: 0 0 12px var(--accent-green);
  animation: pulse-dot 1.8s infinite ease-in-out;
}

.status-timestamp {
  font-size: 0.82rem;
  color: var(--text-subtle);
}

.btn-refresh-ping {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  border-radius: var(--radius-full);
  background: rgba(30, 41, 59, 0.6);
  border: 1px solid var(--border-glow);
  color: var(--cta-sky);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.25s ease;
}

.btn-refresh-ping:hover {
  background: rgba(56, 189, 248, 0.15);
  box-shadow: 0 0 15px rgba(56, 189, 248, 0.3);
}

.btn-refresh-ping svg.spin {
  animation: spin 1s linear infinite;
}

.node-table-wrap {
  overflow-x: auto;
}

.node-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.node-table th {
  padding: 14px 16px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-subtle);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border-subtle);
}

.node-table td {
  padding: 18px 16px;
  font-size: 0.92rem;
  border-bottom: 1px solid rgba(30, 41, 59, 0.45);
  vertical-align: middle;
}

.node-table tr:hover td {
  background: rgba(8, 145, 178, 0.06);
}

.node-region-cell {
  display: flex;
  align-items: center;
  gap: 12px;
}

.flag-icon {
  font-size: 1.3rem;
  line-height: 1;
}

.node-name-group {
  display: flex;
  flex-direction: column;
}

.node-name {
  font-weight: 700;
  color: var(--text-white);
  font-size: 0.96rem;
}

.node-route {
  font-size: 0.78rem;
  color: var(--text-subtle);
}

.node-latency-val {
  font-weight: 800;
  font-size: 1.05rem;
  color: var(--accent-green);
  font-variant-numeric: tabular-nums;
}

.node-latency-val.amber {
  color: var(--accent-amber);
}

.node-speed-bar {
  width: 100px;
  height: 6px;
  background: rgba(30, 41, 59, 0.8);
  border-radius: 3px;
  overflow: hidden;
  margin-top: 6px;
}

.node-speed-fill {
  height: 100%;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--cyan-primary), var(--accent-green));
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 600;
}

.status-badge.healthy {
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid rgba(16, 185, 129, 0.35);
  color: #34D399;
}

.node-tag-list {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.node-tag {
  font-size: 0.72rem;
  padding: 2px 7px;
  background: rgba(30, 41, 59, 0.6);
  border: 1px solid rgba(148, 163, 184, 0.15);
  border-radius: 4px;
  color: #CBD5E1;
}

/* ==========================================================================
   Section 4: Pricing & Core Advantages (套餐价格 + 核心优势)
   ========================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-bottom: 70px;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  display: flex;
  flex-direction: column;
  position: relative;
  backdrop-filter: blur(14px);
  transition: all 0.35s ease;
}

.pricing-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-glow);
  box-shadow: var(--shadow-cyan);
  background: var(--bg-card-hover);
}

.pricing-card.featured {
  border: 1.5px solid var(--cta-sky);
  box-shadow: 0 0 35px rgba(56, 189, 248, 0.25);
  background: linear-gradient(180deg, rgba(14, 34, 68, 0.9) 0%, rgba(8, 20, 42, 0.85) 100%);
}

.popular-ribbon {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--cyan-primary), var(--cta-sky));
  color: #030712;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 4px 16px;
  border-radius: var(--radius-full);
  letter-spacing: 0.05em;
  box-shadow: 0 0 15px rgba(56, 189, 248, 0.5);
  white-space: nowrap;
}

.plan-header {
  margin-bottom: 24px;
}

.plan-name {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-white);
  margin-bottom: 8px;
}

.plan-desc {
  font-size: 0.88rem;
  color: var(--text-subtle);
  min-height: 42px;
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-subtle);
}

.plan-currency {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--cta-sky);
}

.plan-price {
  font-size: 2.8rem;
  font-weight: 900;
  color: var(--text-white);
  line-height: 1;
}

.plan-period {
  font-size: 0.88rem;
  color: var(--text-subtle);
}

.plan-features-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 32px;
  flex-grow: 1;
}

.plan-feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: #CBD5E1;
}

.plan-feature-item svg {
  color: var(--cyan-bright);
  flex-shrink: 0;
}

.btn-plan {
  width: 100%;
  padding: 14px 20px;
  border-radius: var(--radius-full);
  font-size: 1rem;
  font-weight: 700;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.btn-plan-normal {
  background: rgba(30, 41, 59, 0.7);
  border: 1px solid var(--border-glow);
  color: var(--text-white);
}

.btn-plan-normal:hover {
  background: rgba(56, 189, 248, 0.15);
  border-color: var(--cta-sky);
  color: var(--cta-sky);
}

.btn-plan-featured {
  background: linear-gradient(135deg, var(--cyan-primary), var(--cta-sky));
  color: #030712;
  box-shadow: 0 0 25px rgba(56, 189, 248, 0.4);
}

.btn-plan-featured:hover {
  background: linear-gradient(135deg, var(--cyan-bright), var(--cta-sky-hover));
  box-shadow: 0 0 35px rgba(56, 189, 248, 0.65);
}

/* Core Advantages Grid */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.advantage-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 32px 28px;
  backdrop-filter: blur(12px);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.advantage-card:hover {
  border-color: var(--border-glow);
  transform: translateY(-4px);
  background: var(--bg-card-hover);
}

.advantage-icon-wrap {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(8, 145, 178, 0.25), rgba(6, 182, 212, 0.15));
  border: 1px solid var(--border-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--cta-sky);
  margin-bottom: 20px;
}

.advantage-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-white);
  margin-bottom: 12px;
}

.advantage-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ==========================================================================
   Section 5: FAQ & Knowledge Base (常见问题 + 知识库与教程)
   ========================================================================== */
.faq-wrap {
  max-width: 860px;
  margin: 0 auto 80px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  backdrop-filter: blur(12px);
  overflow: hidden;
  transition: all 0.25s ease;
}

.faq-item:hover {
  border-color: var(--border-glow);
}

.faq-question {
  width: 100%;
  padding: 22px 26px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-align: left;
  background: transparent;
  color: var(--text-white);
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
}

.faq-question svg {
  color: var(--cta-sky);
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

.faq-item.active .faq-question svg {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  padding: 0 26px;
  color: #CBD5E1;
  font-size: 0.95rem;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding-bottom: 22px;
}

/* Knowledge Base Grid */
.kb-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.kb-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 26px;
  display: flex;
  flex-direction: column;
  backdrop-filter: blur(12px);
  transition: all 0.3s ease;
  position: relative;
}

.kb-card:hover {
  border-color: var(--border-glow);
  transform: translateY(-4px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
  background: var(--bg-card-hover);
}

.kb-card-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--cyan-light);
  margin-bottom: 12px;
}

.kb-card-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-white);
  line-height: 1.4;
  margin-bottom: 12px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.kb-card-title a {
  color: inherit;
}

.kb-card-title a:hover {
  color: var(--cta-sky);
}

.kb-card-snippet {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex-grow: 1;
}

.kb-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.82rem;
  color: var(--text-subtle);
}

.kb-card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--cta-sky);
  font-weight: 600;
}

.kb-card-link:hover {
  gap: 10px;
}

/* ==========================================================================
   Section 6: User Reviews / Testimonials (用户评价板块)
   ========================================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 30px 26px;
  backdrop-filter: blur(12px);
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
}

.review-card:hover {
  border-color: var(--border-glow);
  transform: translateY(-4px);
  background: var(--bg-card-hover);
}

.review-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}

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

.reviewer-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--cyan-primary), var(--cyan-bright));
  color: #030712;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

.reviewer-info {
  display: flex;
  flex-direction: column;
}

.reviewer-name {
  font-size: 0.96rem;
  font-weight: 700;
  color: var(--text-white);
}

.reviewer-role {
  font-size: 0.78rem;
  color: var(--cyan-light);
}

.review-stars {
  color: #FBBF24;
  font-size: 0.9rem;
  letter-spacing: 2px;
}

.review-content {
  font-size: 0.92rem;
  color: #CBD5E1;
  line-height: 1.65;
  margin-bottom: 20px;
  flex-grow: 1;
}

.review-metrics-badge {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  background: rgba(3, 7, 18, 0.6);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.review-metrics-badge strong {
  color: var(--accent-green);
}

/* ==========================================================================
   Bottom CTA Banner & Footer
   ========================================================================== */
.bottom-cta-wrap {
  margin-top: 40px;
  background: linear-gradient(135deg, rgba(8, 145, 178, 0.25), rgba(6, 182, 212, 0.15));
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-lg);
  padding: 56px 40px;
  text-align: center;
  box-shadow: 0 0 50px rgba(8, 145, 178, 0.2);
  backdrop-filter: blur(16px);
}

.bottom-cta-title {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--text-white);
  margin-bottom: 16px;
}

.bottom-cta-desc {
  font-size: 1.05rem;
  color: #CBD5E1;
  max-width: 650px;
  margin: 0 auto 32px;
}

.site-footer {
  border-top: 1px solid var(--border-subtle);
  padding: 60px 0 36px;
  background: rgba(2, 6, 16, 0.95);
  font-size: 0.88rem;
  color: var(--text-subtle);
  position: relative;
  z-index: 1;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand p {
  margin-top: 14px;
  color: var(--text-muted);
  line-height: 1.6;
  max-width: 320px;
}

.footer-col-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-white);
  margin-bottom: 18px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a:hover {
  color: var(--cta-sky);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 30px;
  border-top: 1px solid rgba(30, 41, 59, 0.5);
  font-size: 0.82rem;
  flex-wrap: wrap;
  gap: 14px;
}

/* ==========================================================================
   Article Pages Specific Styles (知识库单篇)
   ========================================================================== */
.article-page {
  padding-top: 40px;
  padding-bottom: 80px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-subtle);
  margin-bottom: 30px;
  flex-wrap: wrap;
}

.breadcrumb a:hover {
  color: var(--cta-sky);
}

.breadcrumb-separator {
  color: var(--border-subtle);
}

.article-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 40px;
  align-items: start;
}

.article-main {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 44px;
  backdrop-filter: blur(14px);
}

.article-header {
  margin-bottom: 36px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-subtle);
}

.article-header-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.85rem;
  color: var(--text-subtle);
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.article-page-title {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--text-white);
  line-height: 1.3;
  margin-bottom: 18px;
}

.article-lead {
  font-size: 1.05rem;
  color: #CBD5E1;
  line-height: 1.7;
  padding: 16px 20px;
  background: rgba(8, 145, 178, 0.1);
  border-left: 4px solid var(--cyan-bright);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

/* Article Body Typography */
.article-content {
  color: #CBD5E1;
  font-size: 1.02rem;
  line-height: 1.85;
}

.article-content h2 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-white);
  margin: 38px 0 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  gap: 10px;
}

.article-content h2::before {
  content: "";
  display: inline-block;
  width: 5px;
  height: 22px;
  background: linear-gradient(180deg, var(--cyan-bright), var(--cta-sky));
  border-radius: 3px;
}

.article-content h3 {
  font-size: 1.22rem;
  font-weight: 700;
  color: var(--cyan-light);
  margin: 26px 0 12px;
}

.article-content p {
  margin-bottom: 18px;
}

.article-content ul, .article-content ol {
  margin-bottom: 22px;
  padding-left: 24px;
}

.article-content ul {
  list-style: disc;
}

.article-content ol {
  list-style: decimal;
}

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

.article-content strong {
  color: var(--text-white);
}

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 0.92rem;
  overflow-x: auto;
  display: block;
}

.article-content th, .article-content td {
  padding: 12px 16px;
  border: 1px solid var(--border-subtle);
  text-align: left;
}

.article-content th {
  background: rgba(8, 20, 42, 0.9);
  color: var(--cta-sky);
  font-weight: 700;
}

.article-content tr:nth-child(even) {
  background: rgba(15, 23, 42, 0.4);
}

.article-callout {
  padding: 20px;
  background: rgba(6, 182, 212, 0.08);
  border: 1px solid rgba(6, 182, 212, 0.25);
  border-radius: var(--radius-md);
  margin: 24px 0;
}

.article-callout-title {
  font-weight: 700;
  color: var(--cta-sky);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.article-sidebar {
  position: sticky;
  top: 96px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.sidebar-widget {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px;
  backdrop-filter: blur(14px);
}

.sidebar-cta-widget {
  background: linear-gradient(180deg, rgba(8, 145, 178, 0.2), rgba(3, 7, 18, 0.8));
  border: 1.5px solid var(--border-glow);
  text-align: center;
}

.sidebar-cta-widget .btn-hero-primary {
  width: 100%;
  padding: 12px 20px;
  font-size: 0.98rem;
  margin-top: 16px;
}

.related-articles-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.related-article-link {
  font-size: 0.9rem;
  color: #CBD5E1;
  display: flex;
  align-items: flex-start;
  gap: 8px;
  line-height: 1.45;
}

.related-article-link:hover {
  color: var(--cta-sky);
}

/* ==========================================================================
   Keyframes & Utilities
   ========================================================================== */
@keyframes pulse-dot {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.4;
    transform: scale(0.85);
  }
}

@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-title {
    font-size: 2.8rem;
  }
  .pricing-grid, .advantages-grid, .kb-grid, .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .hero-stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
  .article-layout {
    grid-template-columns: 1fr;
  }
  .article-sidebar {
    position: static;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 76px;
    left: 0;
    width: 100%;
    background: rgba(3, 7, 18, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 30px 24px;
    gap: 18px;
    border-bottom: 1px solid var(--border-subtle);
    transform: translateY(-150%);
    transition: transform 0.35s ease;
  }
  .nav-menu.open {
    transform: translateY(0);
  }
  .mobile-toggle {
    display: block;
  }
  .hero-title {
    font-size: 2.15rem;
  }
  .hero-subtitle {
    font-size: 1.05rem;
  }
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }
  .btn-hero-primary, .btn-hero-secondary {
    width: 100%;
    justify-content: center;
  }
  .pricing-grid, .advantages-grid, .kb-grid, .reviews-grid {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .article-main {
    padding: 24px 18px;
  }
  .article-page-title {
    font-size: 1.6rem;
  }
}