/* ==========================================================================
   梯子云 (TiziCloud) - 现代化原生极简样式表
   零重型外部依赖 | 纯原生 CSS | 极致加载速度 | 响应式设计
   ========================================================================== */

:root {
  --bg-primary: #070a13;
  --bg-secondary: #0c1222;
  --bg-card: rgba(13, 20, 36, 0.72);
  --bg-card-hover: rgba(22, 34, 62, 0.82);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-highlight: rgba(59, 130, 246, 0.45);
  --border-glow: rgba(56, 189, 248, 0.5);
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-gradient: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 50%, #06b6d4 100%);
  --accent-cyan: #38bdf8;
  --accent-green: #10b981;
  --accent-orange: #f59e0b;
  
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 15px 35px -5px rgba(0, 0, 0, 0.6), 0 0 25px rgba(59, 130, 246, 0.2);
  --shadow-glow: 0 0 25px rgba(56, 189, 248, 0.4);
  --card-glass-glow: inset 0 1px 1px 0 rgba(255, 255, 255, 0.1);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  --container-max: 1200px;
}

/* 基础重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.65;
  overflow-x: hidden;
  position: relative;
  background-image: 
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    radial-gradient(circle at 10% 12%, rgba(59, 130, 246, 0.18) 0%, transparent 45%),
    radial-gradient(circle at 88% 25%, rgba(139, 92, 246, 0.16) 0%, transparent 45%),
    radial-gradient(circle at 50% 75%, rgba(6, 182, 212, 0.1) 0%, transparent 55%);
  background-size: 40px 40px, 40px 40px, 100% 100%, 100% 100%, 100% 100%;
  background-attachment: fixed;
}

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

ul {
  list-style: none;
}

img, svg {
  vertical-align: middle;
}

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

.section {
  padding: 80px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 50px auto;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  background: rgba(59, 130, 246, 0.12);
  border: 1px solid rgba(59, 130, 246, 0.25);
  color: #60a5fa;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  margin-bottom: 16px;
  text-transform: uppercase;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

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

.gradient-text {
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ==========================================================================
   导航栏 (Navbar)
   ========================================================================== */
.navbar {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(9, 13, 22, 0.78);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}

.navbar-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.5px;
}

.brand-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-gradient);
  border-radius: 10px;
  box-shadow: 0 0 12px rgba(59, 130, 246, 0.4);
}

.brand-icon svg {
  width: 22px;
  height: 22px;
  fill: #ffffff;
}

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

.nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 6px 0;
}

.nav-links a:hover {
  color: var(--text-primary);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--primary-gradient);
  transition: var(--transition);
}

.nav-links a:hover::after {
  width: 100%;
}

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

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  font-size: 0.92rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: 1px solid transparent;
  transition: var(--transition);
  white-space: nowrap;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.88rem;
}

.btn-lg {
  padding: 14px 28px;
  font-size: 1.05rem;
  border-radius: var(--radius-md);
}

.btn-primary {
  background: var(--primary-gradient);
  color: #ffffff;
  box-shadow: 0 4px 15px rgba(59, 130, 246, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.15);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-2px);
}

.btn-ghost {
  color: var(--text-secondary);
  background: transparent;
}

.btn-ghost:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

.btn-outline {
  background: transparent;
  border-color: rgba(59, 130, 246, 0.5);
  color: #60a5fa;
}

.btn-outline:hover {
  background: rgba(59, 130, 246, 0.1);
  border-color: #60a5fa;
  transform: translateY(-2px);
}

/* 移动端汉堡菜单 (纯 CSS 控制) */
.menu-toggle {
  display: none;
}

.hamburger {
  display: none;
  cursor: pointer;
  width: 28px;
  height: 20px;
  position: relative;
  flex-direction: column;
  justify-content: space-between;
}

.hamburger span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* ==========================================================================
   首屏横幅区 (Hero Section)
   ========================================================================== */
.hero-section {
  padding: 90px 0 70px 0;
  text-align: center;
  position: relative;
}

.hero-promo-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: rgba(245, 158, 11, 0.12);
  border: 1px solid rgba(245, 158, 11, 0.35);
  color: #fbbf24;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 24px;
  box-shadow: 0 0 16px rgba(245, 158, 11, 0.2);
  animation: pulse-border 2.5s infinite;
}

@keyframes pulse-border {
  0%, 100% { border-color: rgba(245, 158, 11, 0.35); }
  50% { border-color: rgba(245, 158, 11, 0.85); box-shadow: 0 0 20px rgba(245, 158, 11, 0.4); }
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -1.5px;
  margin-bottom: 22px;
  max-width: 950px;
  margin-left: auto;
  margin-right: auto;
}

.hero-subtitle {
  font-size: 1.18rem;
  color: var(--text-secondary);
  max-width: 780px;
  margin: 0 auto 36px auto;
  line-height: 1.75;
}

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

.hero-trust-badges {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
  max-width: 860px;
  margin: 0 auto;
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
}

.trust-item svg {
  width: 18px;
  height: 18px;
  color: var(--accent-cyan);
}

/* ==========================================================================
   核心优势图卡区 (Dynamic Cards Section)
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-bottom: 36px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: var(--shadow-sm), var(--card-glass-glow);
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--primary-gradient);
  opacity: 0;
  transition: var(--transition);
}

.feature-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-glow);
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg), 0 0 20px rgba(56, 189, 248, 0.2);
}

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

.feature-icon-wrapper {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: rgba(59, 130, 246, 0.12);
  border: 1px solid rgba(59, 130, 246, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  color: #60a5fa;
}

.feature-icon-wrapper svg {
  width: 28px;
  height: 28px;
}

.feature-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.feature-desc {
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* 流媒体与 AI 支持大图卡 */
.unlock-showcase-card {
  background: linear-gradient(135deg, rgba(15, 23, 42, 0.85) 0%, rgba(30, 41, 59, 0.65) 100%);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: var(--radius-lg);
  padding: 40px;
  margin-top: 24px;
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
}

.unlock-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 28px;
  flex-wrap: wrap;
  gap: 16px;
}

.unlock-header h3 {
  font-size: 1.5rem;
  font-weight: 700;
}

.status-badge-online {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: #34d399;
  font-size: 0.85rem;
  font-weight: 600;
}

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

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.8); }
}

.unlock-tags-container {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 24px;
}

.unlock-tag {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  font-weight: 500;
  transition: var(--transition);
}

.unlock-tag:hover {
  background: rgba(59, 130, 246, 0.15);
  border-color: rgba(59, 130, 246, 0.35);
  transform: translateY(-2px);
}

.unlock-tag svg {
  width: 18px;
  height: 18px;
}

/* ==========================================================================
   定价卡片区 (Pricing Section)
   ========================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 38px 30px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  transition: var(--transition);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: var(--shadow-sm), var(--card-glass-glow);
}

.pricing-card:hover {
  border-color: var(--border-glow);
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg), 0 0 20px rgba(56, 189, 248, 0.2);
}

.pricing-card.featured {
  background: linear-gradient(180deg, rgba(22, 34, 62, 0.85) 0%, rgba(13, 20, 36, 0.95) 100%);
  border: 2px solid rgba(56, 189, 248, 0.7);
  box-shadow: 0 0 35px rgba(59, 130, 246, 0.35), 0 0 15px rgba(56, 189, 248, 0.2), var(--card-glass-glow);
  transform: scale(1.02);
}

.pricing-card.featured:hover {
  transform: scale(1.02) translateY(-6px);
  border-color: #38bdf8;
  box-shadow: 0 0 50px rgba(56, 189, 248, 0.45), 0 0 20px rgba(59, 130, 246, 0.3);
}

.pricing-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary-gradient);
  color: #ffffff;
  padding: 4px 18px;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
}

.pricing-header {
  margin-bottom: 24px;
  text-align: center;
}

.plan-name {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 8px;
}

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

.pricing-price-wrap {
  margin: 18px 0;
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
}

.price-currency {
  font-size: 1.5rem;
  font-weight: 700;
  color: #60a5fa;
}

.price-amount {
  font-size: 3rem;
  font-weight: 900;
  color: var(--text-primary);
  line-height: 1;
}

.price-unit {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.traffic-highlight {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: var(--radius-sm);
  color: #60a5fa;
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 20px;
}

.pricing-features {
  border-top: 1px solid var(--border-color);
  padding-top: 24px;
  margin-bottom: 30px;
  flex-grow: 1;
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.94rem;
  color: var(--text-secondary);
  margin-bottom: 14px;
}

.pricing-features li svg {
  width: 18px;
  height: 18px;
  color: var(--accent-green);
  flex-shrink: 0;
}

.pricing-card .btn {
  width: 100%;
}

/* ==========================================================================
   深度特性解析区 (Why Choose Section)
   ========================================================================== */
.why-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  align-items: center;
  margin-bottom: 70px;
}

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

.why-content h3 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 18px;
  line-height: 1.3;
}

.why-content p {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 24px;
}

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

.why-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.98rem;
  color: var(--text-primary);
}

.why-feature-item svg {
  width: 20px;
  height: 20px;
  color: #60a5fa;
  flex-shrink: 0;
  margin-top: 3px;
}

/* 视觉化动态数据面板 */
.stats-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(8px);
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 16px;
  margin-bottom: 20px;
}

.panel-header-title {
  font-size: 0.95rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}

.ping-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 14px;
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--radius-sm);
  margin-bottom: 10px;
  font-size: 0.92rem;
}

.ping-region {
  display: flex;
  align-items: center;
  gap: 10px;
}

.ping-val {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-weight: 700;
  color: var(--accent-green);
}

.bandwidth-meter {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--border-color);
}

.meter-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.meter-bar-bg {
  width: 100%;
  height: 8px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.meter-bar-fill {
  height: 100%;
  width: 96%;
  background: var(--primary-gradient);
  border-radius: var(--radius-full);
  animation: meter-pulse 3s ease-in-out infinite alternate;
}

@keyframes meter-pulse {
  0% { width: 92%; }
  100% { width: 98%; }
}

/* 极客风格终端代码块 (Strict_No_Logs_Policy.sh) */
.terminal-block {
  background: #090d16;
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: var(--radius-md);
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.7), 0 0 25px rgba(56, 189, 248, 0.12), var(--card-glass-glow);
  overflow: hidden;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.88rem;
  backdrop-filter: blur(12px);
}

.terminal-header {
  background: #111827;
  padding: 10px 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.terminal-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  display: inline-block;
}

.dot-red { background: #ef4444; box-shadow: 0 0 6px rgba(239, 68, 68, 0.6); }
.dot-yellow { background: #eab308; box-shadow: 0 0 6px rgba(234, 179, 8, 0.6); }
.dot-green { background: #22c55e; box-shadow: 0 0 6px rgba(34, 197, 94, 0.6); }

.terminal-title {
  margin-left: 8px;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.terminal-body {
  padding: 22px;
  color: #c9d1d9;
  line-height: 1.75;
}

.t-prompt { color: #58a6ff; }
.t-cmd { color: #f0883e; font-weight: 600; }
.t-comment { color: #8b949e; }
.t-success { color: #3fb950; font-weight: 600; }
.t-warning { color: #d29922; }
.t-cyan { color: #38bdf8; }

.blinking-cursor {
  display: inline-block;
  color: #38bdf8;
  font-weight: 700;
  animation: blink-cursor 1s step-end infinite;
  margin-left: 2px;
}

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

/* 动态延迟监控指示点 */
.ping-dot {
  width: 8px;
  height: 8px;
  background-color: #10b981;
  border-radius: 50%;
  display: inline-block;
  position: relative;
  box-shadow: 0 0 8px #10b981;
  margin-right: 6px;
  flex-shrink: 0;
}

.ping-dot::after {
  content: '';
  position: absolute;
  top: -3px;
  left: -3px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 1px solid rgba(16, 185, 129, 0.6);
  animation: ping-ripple 2s infinite ease-out;
}

@keyframes ping-ripple {
  0% { transform: scale(0.6); opacity: 1; }
  100% { transform: scale(2.2); opacity: 0; }
}

/* ==========================================================================
   用户评价跑马灯区 (Testimonials Marquee Section)
   ========================================================================== */
.testimonials-section {
  overflow: hidden;
  padding: 80px 0;
}

.marquee-container {
  width: 100%;
  overflow: hidden;
  position: relative;
  mask-image: linear-gradient(to right, transparent 0%, black 10%, black 90%, transparent 100%);
  -webkit-mask-image: linear-gradient(to right, transparent 0%, black 10%, black 90%, transparent 100%);
}

.marquee-track {
  display: flex;
  gap: 24px;
  width: max-content;
  animation: marquee-scroll 35s linear infinite;
}

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

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

.testimonial-card {
  width: 360px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  flex-shrink: 0;
  transition: var(--transition);
}

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

.stars-row {
  color: #fbbf24;
  margin-bottom: 12px;
  display: flex;
  gap: 2px;
}

.testimonial-text {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 18px;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.user-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--primary-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #ffffff;
  font-size: 0.95rem;
}

.user-meta h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
}

.user-meta p {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ==========================================================================
   常见问题解答区 (FAQ Section)
   ========================================================================== */
.faq-wrapper {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

details.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 18px 24px;
  transition: var(--transition);
  cursor: pointer;
}

details.faq-item[open] {
  background: var(--bg-card-hover);
  border-color: var(--border-highlight);
}

summary.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  outline: none;
  user-select: none;
  list-style: none;
}

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

.faq-arrow {
  width: 20px;
  height: 20px;
  color: var(--text-muted);
  transition: transform 0.25s ease;
  flex-shrink: 0;
  margin-left: 12px;
}

details.faq-item[open] .faq-arrow {
  transform: rotate(180deg);
  color: #60a5fa;
}

.faq-answer {
  padding-top: 14px;
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.7;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  margin-top: 14px;
}

/* ==========================================================================
   底部二次转化区 (CTA Section)
   ========================================================================== */
.final-cta-section {
  padding: 90px 0;
}

.cta-banner {
  background: radial-gradient(circle at center, rgba(59, 130, 246, 0.22) 0%, rgba(15, 23, 42, 0.9) 100%),
              linear-gradient(180deg, #111827 0%, #0b0f19 100%);
  border: 1px solid var(--border-highlight);
  border-radius: var(--radius-lg);
  padding: 60px 40px;
  text-align: center;
  box-shadow: 0 0 50px rgba(59, 130, 246, 0.2);
  position: relative;
  overflow: hidden;
}

.cta-banner h2 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.cta-banner p {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 36px auto;
}

/* ==========================================================================
   页脚 (Footer)
   ========================================================================== */
.footer {
  border-top: 1px solid var(--border-color);
  background: #060911;
  padding: 40px 0;
  text-align: center;
}

.footer-nav {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 36px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.footer-nav a {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  position: relative;
}

.footer-nav a:hover {
  color: #60a5fa;
}

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

/* ==========================================================================
   子页面统一布局样式 (About / Terms / Privacy / Sitemap)
   ========================================================================== */
.page-header {
  padding: 60px 0 40px 0;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 50px;
}

.page-title {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.page-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
}

.page-content-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px;
  margin-bottom: 60px;
  backdrop-filter: blur(8px);
}

.page-content-box h2 {
  font-size: 1.6rem;
  font-weight: 700;
  margin: 32px 0 16px 0;
  color: #60a5fa;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding-bottom: 8px;
}

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

.page-content-box p {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
}

.page-content-box ul {
  list-style: disc;
  padding-left: 24px;
  margin-bottom: 20px;
}

.page-content-box li {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 8px;
}

/* ==========================================================================
   响应式媒体查询 (@media)
   ========================================================================== */
@media (max-width: 992px) {
  .hero-title {
    font-size: 2.8rem;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 500px;
    margin: 0 auto;
  }
  
  .pricing-card.featured {
    transform: none;
  }
  
  .pricing-card.featured:hover {
    transform: translateY(-6px);
  }
  
  .why-row {
    grid-template-columns: 1fr;
    gap: 36px;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .nav-actions .btn-ghost {
    display: none;
  }
  
  .hamburger {
    display: flex;
  }
  
  /* 移动端菜单激活样式 */
  .menu-toggle:checked ~ .nav-links {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 72px;
    left: 0;
    width: 100%;
    background: #090d16;
    border-bottom: 1px solid var(--border-color);
    padding: 24px;
    gap: 20px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.5);
  }
  
  .hero-section {
    padding: 60px 0 40px 0;
  }
  
  .hero-title {
    font-size: 2.1rem;
    letter-spacing: -0.5px;
  }
  
  .hero-subtitle {
    font-size: 1rem;
  }
  
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }
  
  .hero-cta-group .btn {
    width: 100%;
    min-height: 50px;
  }
  
  .hero-trust-badges {
    flex-direction: column;
    gap: 16px;
    align-items: flex-start;
  }
  
  .cta-banner {
    padding: 40px 20px;
  }
  
  .cta-banner h2 {
    font-size: 1.8rem;
  }
  
  .footer-nav {
    gap: 20px;
  }
}

/* ==========================================================================
   推荐资讯与深度 SEO 文章专用样式 (Insights & SEO Articles)
   ========================================================================== */
.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.breadcrumbs a {
  color: var(--text-secondary);
}

.breadcrumbs a:hover {
  color: #60a5fa;
}

.article-toc-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px 30px;
  margin-bottom: 40px;
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(8px);
}

.article-toc-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.article-toc-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px 24px;
  list-style: none;
}

.article-toc-list li {
  font-size: 0.95rem;
}

.article-toc-list a {
  color: #60a5fa;
  display: flex;
  align-items: center;
  gap: 6px;
}

.article-toc-list a:hover {
  color: #93c5fd;
  text-decoration: underline;
}

.seo-article-post {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 45px;
  margin-bottom: 45px;
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(8px);
  position: relative;
}

.seo-article-post:hover {
  border-color: rgba(59, 130, 246, 0.25);
}

.article-meta-row {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.article-category-badge {
  padding: 4px 12px;
  background: rgba(59, 130, 246, 0.15);
  border: 1px solid rgba(59, 130, 246, 0.3);
  color: #60a5fa;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
}

.article-date {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.article-h1-title {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1.35;
  margin-bottom: 24px;
  color: var(--text-primary);
  letter-spacing: -0.5px;
}

.article-body h2 {
  font-size: 1.45rem;
  font-weight: 700;
  margin: 32px 0 16px 0;
  color: #60a5fa;
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding-bottom: 10px;
}

.article-body h3 {
  font-size: 1.18rem;
  font-weight: 600;
  margin: 22px 0 12px 0;
  color: #e2e8f0;
}

.article-body p {
  font-size: 1.02rem;
  color: #cbd5e1;
  line-height: 1.85;
  margin-bottom: 18px;
}

.article-body ul, .article-body ol {
  margin-bottom: 20px;
  padding-left: 24px;
}

.article-body li {
  font-size: 0.98rem;
  color: #cbd5e1;
  line-height: 1.8;
  margin-bottom: 8px;
}

.article-callout {
  background: rgba(59, 130, 246, 0.08);
  border-left: 4px solid #3b82f6;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 18px 22px;
  margin: 24px 0;
  color: #e2e8f0;
}

.article-callout strong {
  color: #60a5fa;
}

.internal-link {
  color: #38bdf8;
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 4px;
  transition: var(--transition);
}

.internal-link:hover {
  color: #60a5fa;
  text-decoration-color: #60a5fa;
}

.seo-data-table-wrap {
  width: 100%;
  overflow-x: auto;
  margin: 24px 0;
}

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

.seo-data-table th {
  background: rgba(30, 41, 59, 0.9);
  color: #f8fafc;
  padding: 12px 16px;
  font-weight: 600;
  border: 1px solid var(--border-color);
}

.seo-data-table td {
  padding: 12px 16px;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
}

.seo-data-table tr:nth-child(even) {
  background: rgba(255, 255, 255, 0.02);
}

.article-cta-box {
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.15) 0%, rgba(139, 92, 246, 0.15) 100%);
  border: 1px solid rgba(59, 130, 246, 0.35);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-top: 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.article-cta-text h4 {
  font-size: 1.15rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 6px;
}

.article-cta-text p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 0;
}

@media (max-width: 768px) {
  .article-toc-list {
    grid-template-columns: 1fr;
  }
  
  .seo-article-post {
    padding: 24px 18px;
  }
  
  .article-h1-title {
    font-size: 1.5rem;
  }
  
  .article-cta-box {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .article-cta-box .btn {
    width: 100%;
  }
}