/* ==========================================================================
   魔戒机场 (The One Ring Cloud) - 拓扑极简主义核心样式表
   Topological Möbius-strip Minimalist Architecture
   Palette: Basalt Grain Black (#08090b), Titanium Bone (#f1f3f5), Circuit-Cyan (#06b6d4)
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. 基础拓扑变量与配色体系 (默认白天模式)
   -------------------------------------------------------------------------- */
:root {
  --font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Roboto Mono", Menlo, Consolas, monospace;
  
  /* 白天模式 (Cold Titanium & Frosted Acrylic) */
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --bg-abyss: #08090b;
  
  --card-bg: rgba(255, 255, 255, 0.85);
  --card-border: rgba(203, 213, 225, 0.75);
  --card-hover-border: #06b6d4;
  --hairline: rgba(148, 163, 184, 0.25);
  
  --card-shadow: 0 12px 32px -4px rgba(15, 23, 42, 0.06), 0 4px 8px -2px rgba(15, 23, 42, 0.02);
  --card-shadow-hover: 0 20px 40px -8px rgba(6, 182, 212, 0.18), 0 0 0 1px rgba(6, 182, 212, 0.4);
  
  --text-primary: #08090b;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --text-inverse: #f1f3f5;
  
  --accent-cyan: #06b6d4;
  --accent-cyan-glow: rgba(6, 182, 212, 0.35);
  --accent-cyan-light: rgba(6, 182, 212, 0.1);
  --circuit-ribbon: linear-gradient(135deg, #06b6d4 0%, #0284c7 50%, #3b82f6 100%);
  
  --nav-bg: rgba(248, 250, 252, 0.82);
  --nav-border: rgba(226, 232, 240, 0.85);
  --glass-bg: rgba(255, 255, 255, 0.65);
  --glass-border: rgba(203, 213, 225, 0.6);
  
  --grid-pattern: radial-gradient(rgba(6, 182, 212, 0.12) 1px, transparent 1px);
  --canvas-glow: radial-gradient(circle at 50% 45%, rgba(6, 182, 212, 0.09) 0%, rgba(248, 250, 252, 0) 70%);

  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-xl: 32px;
  --radius-full: 9999px;

  --transition-fast: 0.18s cubic-bezier(0.16, 1, 0.3, 1);
  --transition: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-smooth: 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

/* --------------------------------------------------------------------------
   夜间深渊拓扑模式 (Deep Mathematical Abyss Mode)
   -------------------------------------------------------------------------- */
[data-theme="dark"] {
  --bg-primary: #08090b;
  --bg-secondary: #0d1117;
  --bg-tertiary: #131922;
  
  --card-bg: rgba(13, 17, 23, 0.78);
  --card-border: rgba(51, 65, 85, 0.45);
  --card-hover-border: #06b6d4;
  --hairline: rgba(51, 65, 85, 0.35);
  
  --card-shadow: 0 16px 40px -8px rgba(0, 0, 0, 0.7);
  --card-shadow-hover: 0 24px 50px -8px rgba(6, 182, 212, 0.28), 0 0 20px rgba(6, 182, 212, 0.2);
  
  --text-primary: #f1f3f5;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-inverse: #08090b;
  
  --accent-cyan: #22d3ee;
  --accent-cyan-glow: rgba(34, 211, 238, 0.5);
  --accent-cyan-light: rgba(6, 182, 212, 0.15);
  --circuit-ribbon: linear-gradient(135deg, #22d3ee 0%, #06b6d4 50%, #38bdf8 100%);
  
  --nav-bg: rgba(8, 9, 11, 0.85);
  --nav-border: rgba(30, 41, 59, 0.7);
  --glass-bg: rgba(19, 25, 34, 0.7);
  --glass-border: rgba(51, 65, 85, 0.6);
  
  --grid-pattern: radial-gradient(rgba(34, 211, 238, 0.15) 1px, transparent 1px);
  --canvas-glow: radial-gradient(circle at 50% 45%, rgba(6, 182, 212, 0.18) 0%, rgba(8, 9, 11, 0) 72%);
}

/* --------------------------------------------------------------------------
   2. 全局基础重置与数学排版
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.6;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  transition: background-color 0.35s ease, color 0.35s ease;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  background-image: var(--grid-pattern);
  background-size: 32px 32px;
}

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

img, svg {
  display: block;
  max-width: 100%;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

.container {
  width: 100%;
  max-width: 1220px;
  margin: 0 auto;
  padding: 0 24px;
}

.text-cyan {
  color: var(--accent-cyan);
}

.mono {
  font-family: var(--font-mono);
}

.text-gradient {
  background: var(--circuit-ribbon);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.telemetry-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  font-size: 0.82rem;
  font-weight: 600;
  font-family: var(--font-mono);
  border-radius: var(--radius-full);
  background: var(--accent-cyan-light);
  color: var(--accent-cyan);
  border: 1px solid var(--accent-cyan-glow);
  box-shadow: 0 0 12px var(--accent-cyan-light);
  letter-spacing: 0.04em;
}

.pulse-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--accent-cyan);
  box-shadow: 0 0 8px var(--accent-cyan);
  animation: pulseLoop 2s infinite ease-in-out;
}

@keyframes pulseLoop {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}

/* --------------------------------------------------------------------------
   3. 拓扑航行页眉 (Header & Navbar)
   -------------------------------------------------------------------------- */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--nav-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--nav-border);
  transition: background-color 0.35s ease, border-color 0.35s ease;
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.logo-mobius, .logo-ring {
  width: 40px;
  height: 40px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--glass-bg);
  border: 1px solid rgba(255, 183, 3, 0.45);
  border-radius: 12px;
  box-shadow: 0 0 16px rgba(255, 183, 3, 0.25);
  transition: var(--transition-fast);
  flex-shrink: 0;
}

.logo:hover .logo-mobius, .logo:hover .logo-ring {
  border-color: #FFB703;
  box-shadow: 0 0 24px rgba(255, 183, 3, 0.55);
  transform: scale(1.05);
}

.logo-mobius svg, .logo-ring svg, .logo-ring img {
  width: 32px;
  height: 32px;
  display: block;
  object-fit: contain;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-secondary);
  padding: 6px 4px;
  position: relative;
  transition: var(--transition-fast);
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--accent-cyan);
  transition: width 0.25s ease, left 0.25s ease;
  box-shadow: 0 0 8px var(--accent-cyan);
}

.nav-link:hover, .nav-link.active {
  color: var(--accent-cyan);
}

.nav-link:hover::after, .nav-link.active::after {
  width: 100%;
  left: 0;
}

.nav-tag-hot {
  font-size: 0.68rem;
  font-weight: 700;
  font-family: var(--font-mono);
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--accent-cyan);
  color: #08090b;
  margin-left: 4px;
  vertical-align: top;
}

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

/* 昼夜模式切换按钮 (精致、透明专业微质感) */
.theme-toggle-btn {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.theme-toggle-btn:hover {
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
  box-shadow: 0 0 16px var(--accent-cyan-light);
  transform: translateY(-1px);
}

.theme-toggle-btn svg {
  width: 20px;
  height: 20px;
  position: absolute;
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s ease;
}

.icon-sun {
  opacity: 1;
  transform: scale(1) rotate(0deg);
}

.icon-moon {
  opacity: 0;
  transform: scale(0.4) rotate(90deg);
}

[data-theme="dark"] .icon-sun {
  opacity: 0;
  transform: scale(0.4) rotate(-90deg);
}

[data-theme="dark"] .icon-moon {
  opacity: 1;
  transform: scale(1) rotate(0deg);
}

/* 按钮通用拓扑规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  font-size: 0.94rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: var(--transition-fast);
  white-space: nowrap;
  line-height: 1.2;
  position: relative;
  cursor: pointer;
}

.btn-cyan {
  background: var(--circuit-ribbon);
  color: #08090b;
  font-weight: 700;
  box-shadow: 0 4px 18px var(--accent-cyan-glow);
  border: 1px solid rgba(255, 255, 255, 0.25);
}

.btn-cyan:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px var(--accent-cyan);
}

.btn-acrylic {
  background: var(--glass-bg);
  color: var(--text-primary);
  border: 1px solid var(--card-border);
  backdrop-filter: blur(12px);
}

.btn-acrylic:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  box-shadow: 0 0 16px var(--accent-cyan-light);
  transform: translateY(-1px);
}

.btn-lg {
  padding: 14px 34px;
  font-size: 1.05rem;
  border-radius: var(--radius-sm);
}

/* --------------------------------------------------------------------------
   4. 主视觉区 (Hero Section with 3D Möbius Strip Ring Canvas)
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  padding: 80px 0 60px;
  overflow: hidden;
  background-image: var(--canvas-glow);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 40px;
}

.hero-copy {
  z-index: 2;
}

.hero .telemetry-badge {
  margin-bottom: 22px;
}

.hero-title {
  font-size: 3.4rem;
  line-height: 1.14;
  font-weight: 900;
  letter-spacing: -0.035em;
  margin-bottom: 22px;
  color: var(--text-primary);
}

.hero-title .brand-highlight {
  position: relative;
  display: inline-block;
}

.hero-subtitle {
  font-size: 1.18rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 34px;
  max-width: 620px;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 44px;
  flex-wrap: wrap;
}

/* 3D 交互式莫比乌斯环画布容器 */
.mobius-container {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  max-width: 520px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
}

#mobiusCanvas {
  width: 100%;
  height: 100%;
  display: block;
  cursor: grab;
  filter: drop-shadow(0 0 24px var(--accent-cyan-glow));
}

#mobiusCanvas:active {
  cursor: grabbing;
}

/* 浮动无边界磨砂参数面板 (Floating Parameter Panes) */
.floating-pane {
  position: absolute;
  background: var(--glass-bg);
  border: 1px solid var(--hairline);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  padding: 12px 18px;
  border-radius: var(--radius-md);
  box-shadow: var(--card-shadow);
  pointer-events: none;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  z-index: 5;
  transition: transform 0.25s ease;
}

.floating-pane-tl {
  top: 15px;
  left: -10px;
}

.floating-pane-br {
  bottom: 20px;
  right: -10px;
}

.pane-label {
  color: var(--text-muted);
  font-size: 0.72rem;
  text-transform: uppercase;
  margin-bottom: 2px;
}

.pane-value {
  color: var(--accent-cyan);
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 6px;
}

/* 核心指标参数条 */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  padding-top: 32px;
  border-top: 1px solid var(--hairline);
}

.stat-item {
  border-left: 2px solid var(--accent-cyan);
  padding-left: 12px;
}

.stat-number {
  font-size: 1.7rem;
  font-weight: 900;
  font-family: var(--font-mono);
  line-height: 1.15;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

/* --------------------------------------------------------------------------
   5. 通用拓扑区块排版
   -------------------------------------------------------------------------- */
.section {
  padding: 96px 0;
  position: relative;
}

.section-alt {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 60px;
}

.section-tag {
  font-size: 0.8rem;
  font-weight: 800;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent-cyan);
  margin-bottom: 12px;
  display: block;
}

.section-title {
  font-size: 2.35rem;
  font-weight: 900;
  line-height: 1.22;
  margin-bottom: 16px;
  letter-spacing: -0.025em;
}

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

/* --------------------------------------------------------------------------
   6. 核心产品优势 (3个拓扑图文卡片)
   -------------------------------------------------------------------------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: 38px 30px;
  box-shadow: var(--card-shadow);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--circuit-ribbon);
  opacity: 0;
  transition: opacity 0.3s ease;
}

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

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

.feature-icon-wrapper {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  background: var(--accent-cyan-light);
  border: 1px solid var(--accent-cyan-glow);
  color: var(--accent-cyan);
}

.feature-title {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 14px;
  color: var(--text-primary);
}

.feature-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.72;
  margin-bottom: 22px;
  flex-grow: 1;
}

.feature-list {
  list-style: none;
  border-top: 1px solid var(--hairline);
  padding-top: 18px;
}

.feature-list li {
  font-size: 0.88rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.feature-list li svg {
  color: var(--accent-cyan);
  flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   7. 流媒体与 AI 支持图卡 (双生态拓扑面板)
   -------------------------------------------------------------------------- */
.showcase-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.showcase-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-xl);
  padding: 44px 38px;
  box-shadow: var(--card-shadow);
  position: relative;
  overflow: hidden;
  transition: var(--transition);
  backdrop-filter: blur(14px);
}

.showcase-card:hover {
  transform: translateY(-5px);
  border-color: var(--accent-cyan);
  box-shadow: var(--card-shadow-hover);
}

.showcase-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  font-weight: 700;
  font-family: var(--font-mono);
  padding: 5px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 18px;
  background: var(--accent-cyan-light);
  color: var(--accent-cyan);
  border: 1px solid var(--accent-cyan-glow);
}

.showcase-title {
  font-size: 1.7rem;
  font-weight: 900;
  margin-bottom: 14px;
  letter-spacing: -0.02em;
}

.showcase-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 28px;
}

.tags-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 30px;
}

.service-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  background: var(--bg-tertiary);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-xs);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
  transition: var(--transition-fast);
}

.service-tag:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

.showcase-checklist {
  list-style: none;
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  padding: 20px;
  border: 1px solid var(--hairline);
}

.showcase-checklist li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-secondary);
  margin-bottom: 10px;
}

.showcase-checklist li:last-child {
  margin-bottom: 0;
}

.showcase-checklist svg {
  color: var(--accent-cyan);
  flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   8. 网上真实套餐价格对比表 (魔戒机场真实计费模式)
   -------------------------------------------------------------------------- */
.pricing-meta-banner {
  max-width: 840px;
  margin: -20px auto 44px;
  background: var(--glass-bg);
  border: 1px solid var(--accent-cyan-glow);
  border-radius: var(--radius-md);
  padding: 16px 24px;
  text-align: center;
  font-size: 0.92rem;
  color: var(--text-secondary);
  backdrop-filter: blur(12px);
  box-shadow: 0 0 20px var(--accent-cyan-light);
}

.pricing-meta-banner strong {
  color: var(--accent-cyan);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 18px;
}

.pricing-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 30px 20px;
  box-shadow: var(--card-shadow);
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition);
  backdrop-filter: blur(12px);
}

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

.pricing-card.popular {
  border-color: var(--accent-cyan);
  box-shadow: 0 16px 40px -8px var(--accent-cyan-glow);
  background: linear-gradient(180deg, var(--card-bg) 0%, var(--bg-tertiary) 100%);
}

.popular-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--circuit-ribbon);
  color: #08090b;
  font-size: 0.72rem;
  font-weight: 800;
  font-family: var(--font-mono);
  padding: 3px 12px;
  border-radius: var(--radius-full);
  box-shadow: 0 0 12px var(--accent-cyan);
  white-space: nowrap;
}

.plan-name {
  font-size: 1.18rem;
  font-weight: 800;
  margin-bottom: 6px;
}

.plan-desc {
  font-size: 0.82rem;
  color: var(--text-muted);
  min-height: 48px;
  margin-bottom: 16px;
  line-height: 1.5;
}

.plan-price-wrap {
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--hairline);
}

.currency {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
}

.amount {
  font-size: 2.3rem;
  font-weight: 900;
  font-family: var(--font-mono);
  line-height: 1;
  color: var(--text-primary);
}

.period {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-cyan);
  margin-top: 4px;
  font-family: var(--font-mono);
}

.plan-features {
  list-style: none;
  margin-bottom: 26px;
  flex-grow: 1;
}

.plan-features li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 0.84rem;
  color: var(--text-secondary);
  margin-bottom: 11px;
  line-height: 1.45;
}

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

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

/* --------------------------------------------------------------------------
   9. 用户评价 (Testimonials)
   -------------------------------------------------------------------------- */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.review-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 26px 22px;
  box-shadow: var(--card-shadow);
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  backdrop-filter: blur(10px);
}

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

.review-stars {
  display: flex;
  gap: 4px;
  color: #fbbf24;
  margin-bottom: 12px;
  font-size: 0.9rem;
}

.review-content {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.68;
  margin-bottom: 18px;
  flex-grow: 1;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--hairline);
  padding-top: 14px;
}

.author-avatar {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-xs);
  background: var(--accent-cyan-light);
  border: 1px solid var(--accent-cyan-glow);
  color: var(--accent-cyan);
  font-weight: 800;
  font-family: var(--font-mono);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.92rem;
}

.author-info h4 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-primary);
}

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

/* --------------------------------------------------------------------------
   10. 常见问题解答 (FAQ 手风琴)
   -------------------------------------------------------------------------- */
.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: var(--card-shadow);
  transition: var(--transition);
  backdrop-filter: blur(10px);
}

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

.faq-question {
  width: 100%;
  text-align: left;
  padding: 20px 24px;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  cursor: pointer;
  background: transparent;
}

.faq-icon {
  width: 20px;
  height: 20px;
  transition: transform 0.3s ease;
  color: var(--text-muted);
  flex-shrink: 0;
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
  color: var(--accent-cyan);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0.16, 1, 0.3, 1), padding 0.35s ease;
  padding: 0 24px;
  font-size: 0.94rem;
  line-height: 1.72;
  color: var(--text-secondary);
}

.faq-item.active .faq-answer {
  max-height: 350px;
  padding-bottom: 22px;
}

/* --------------------------------------------------------------------------
   11. 拓扑转化横幅 (CTA Banner)
   -------------------------------------------------------------------------- */
.cta-banner {
  padding: 80px 0;
}

.cta-banner-inner {
  background: var(--bg-abyss);
  border: 1px solid var(--accent-cyan-glow);
  border-radius: var(--radius-xl);
  padding: 68px 40px;
  text-align: center;
  color: #f1f3f5;
  position: relative;
  overflow: hidden;
  box-shadow: 0 24px 60px -12px rgba(6, 182, 212, 0.25);
}

.cta-banner-inner::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -20%;
  width: 140%;
  height: 200%;
  background: radial-gradient(circle, rgba(6, 182, 212, 0.18) 0%, transparent 60%);
  pointer-events: none;
}

.cta-banner-title {
  font-size: 2.5rem;
  font-weight: 900;
  margin-bottom: 16px;
  line-height: 1.25;
  letter-spacing: -0.025em;
}

.cta-banner-desc {
  font-size: 1.15rem;
  color: #94a3b8;
  max-width: 660px;
  margin: 0 auto 36px;
  line-height: 1.65;
}

/* --------------------------------------------------------------------------
   12. 页脚规范 (严格只保留四个链接标题，全部打开新页面)
   -------------------------------------------------------------------------- */
.footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--hairline);
  padding: 48px 0 38px;
  text-align: center;
  transition: var(--transition);
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  list-style: none;
  margin-bottom: 22px;
  flex-wrap: wrap;
}

.footer-nav a {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  position: relative;
  padding: 4px 0;
  transition: var(--transition-fast);
}

.footer-nav a:hover {
  color: var(--accent-cyan);
}

.footer-copyright {
  font-size: 0.84rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   13. 独立内页排版 (关于我们 / 服务条款 / 隐私政策 / 网站地图 / 推荐资讯)
   -------------------------------------------------------------------------- */
.page-hero {
  padding: 70px 0 36px;
  text-align: center;
}

.page-title {
  font-size: 2.6rem;
  font-weight: 900;
  margin-bottom: 12px;
  letter-spacing: -0.025em;
}

.page-subtitle {
  font-size: 1.08rem;
  color: var(--text-secondary);
  max-width: 660px;
  margin: 0 auto;
}

.article-content {
  max-width: 880px;
  margin: 0 auto 80px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-xl);
  padding: 50px 48px;
  box-shadow: var(--card-shadow);
  backdrop-filter: blur(14px);
}

.article-content h2 {
  font-size: 1.5rem;
  font-weight: 800;
  margin: 36px 0 16px;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 1px solid var(--hairline);
  padding-bottom: 8px;
}

.article-content h2:first-of-type {
  margin-top: 0;
}

.article-content h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 24px 0 12px;
  color: var(--text-primary);
}

.article-content p {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
}

.article-content ul, .article-content ol {
  margin: 16px 0 24px 24px;
  color: var(--text-secondary);
}

.article-content li {
  font-size: 0.95rem;
  line-height: 1.75;
  margin-bottom: 8px;
}

.alert-box {
  padding: 18px 22px;
  border-radius: var(--radius-sm);
  margin: 24px 0;
  font-size: 0.92rem;
  line-height: 1.7;
}

.alert-warning {
  background: rgba(245, 158, 11, 0.1);
  border: 1px solid rgba(245, 158, 11, 0.3);
  color: #f59e0b;
}

.alert-success {
  background: var(--accent-cyan-light);
  border: 1px solid var(--accent-cyan-glow);
  color: var(--accent-cyan);
}

/* 资讯列表卡片 */
.news-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  margin-top: 24px;
}

.news-card {
  background: var(--bg-tertiary);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: var(--transition);
}

.news-card:hover {
  border-color: var(--accent-cyan);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--accent-cyan-light);
}

.news-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-cyan);
  margin-bottom: 10px;
}

.news-title {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.news-snippet {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.68;
  margin-bottom: 16px;
}

/* --------------------------------------------------------------------------
   文章独立排版系统 (Breadcrumbs, TOC, Related Reading, FAQ)
   -------------------------------------------------------------------------- */
.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.86rem;
  color: var(--text-muted);
  margin-bottom: 24px;
  flex-wrap: wrap;
}

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

.breadcrumbs a:hover {
  color: var(--accent-cyan);
}

.breadcrumbs-sep {
  opacity: 0.5;
}

.breadcrumbs-current {
  color: var(--accent-cyan);
  font-weight: 600;
}

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

.article-main-title {
  font-size: 2.2rem;
  font-weight: 900;
  line-height: 1.25;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.article-byline {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 0.84rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  flex-wrap: wrap;
}

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

/* 目录 (TOC - Table of Contents) */
.toc-box {
  background: var(--bg-tertiary);
  border: 1px solid var(--hairline);
  border-left: 3px solid var(--accent-cyan);
  border-radius: var(--radius-sm);
  padding: 22px 26px;
  margin: 28px 0 38px;
}

.toc-title {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: toc-counter;
}

.toc-list li {
  margin-bottom: 8px;
  font-size: 0.94rem;
  line-height: 1.6;
}

.toc-list li a {
  color: var(--text-secondary);
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
}

.toc-list li a:hover {
  color: var(--accent-cyan);
  text-decoration: underline;
}

.toc-num {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--accent-cyan);
  font-weight: 700;
}

/* 文章正文强化 */
.article-body h2 {
  font-size: 1.55rem;
  font-weight: 800;
  margin: 44px 0 18px;
  color: var(--text-primary);
  border-bottom: 1px solid var(--hairline);
  padding-bottom: 10px;
  scroll-margin-top: 90px;
}

.article-body h3 {
  font-size: 1.22rem;
  font-weight: 700;
  margin: 28px 0 14px;
  color: var(--text-primary);
  scroll-margin-top: 90px;
}

.article-body p {
  font-size: 1.02rem;
  color: var(--text-secondary);
  line-height: 1.85;
  margin-bottom: 20px;
}

.article-body ul, .article-body ol {
  margin: 18px 0 24px 28px;
  color: var(--text-secondary);
}

.article-body li {
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 10px;
}

.article-body strong {
  color: var(--text-primary);
  font-weight: 700;
}

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

.article-body a:hover {
  opacity: 0.85;
}

/* 比较表格 */
.table-wrap {
  width: 100%;
  overflow-x: auto;
  margin: 28px 0;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
}

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

.article-table th {
  background: var(--bg-tertiary);
  padding: 14px 18px;
  font-weight: 700;
  color: var(--text-primary);
  border-bottom: 1px solid var(--hairline);
}

.article-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--hairline);
  color: var(--text-secondary);
}

.article-table tr:last-child td {
  border-bottom: none;
}

/* 文章内部 FAQ 样式 */
.article-faq {
  margin: 48px 0 36px;
  padding-top: 24px;
  border-top: 1px solid var(--hairline);
}

.article-faq-title {
  font-size: 1.45rem;
  font-weight: 800;
  margin-bottom: 22px;
  color: var(--text-primary);
}

/* 相关阅读模块 */
.related-reading {
  margin-top: 54px;
  padding-top: 36px;
  border-top: 2px dashed var(--hairline);
}

.related-title {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.related-card {
  background: var(--bg-tertiary);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  padding: 18px 20px;
  transition: var(--transition);
}

.related-card:hover {
  border-color: var(--accent-cyan);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px var(--accent-cyan-light);
}

.related-card h4 {
  font-size: 0.98rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text-primary);
  line-height: 1.4;
}

.related-card p {
  font-size: 0.84rem;
  color: var(--text-muted);
  margin: 0;
  line-height: 1.5;
}

@media (max-width: 768px) {
  .related-grid {
    grid-template-columns: 1fr;
  }
  .article-main-title {
    font-size: 1.7rem;
  }
}


/* 网站地图网格 */
.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 24px;
}

.sitemap-card {
  padding: 24px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  border: 1px solid var(--hairline);
}

.sitemap-card h3 {
  font-size: 1.15rem;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.sitemap-card ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.sitemap-card li {
  margin-bottom: 10px;
}

.sitemap-card a {
  color: var(--accent-cyan);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* --------------------------------------------------------------------------
   14. 响应式适配 (@media 媒体查询，移动端完美单栏与手指友好交互)
   -------------------------------------------------------------------------- */
@media (max-width: 1200px) {
  .pricing-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 30px;
  }
  
  .hero-subtitle {
    margin-left: auto;
    margin-right: auto;
  }
  
  .hero-cta-group {
    justify-content: center;
  }
  
  .hero-stats {
    max-width: 600px;
    margin: 0 auto;
    grid-template-columns: repeat(2, 1fr);
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .showcase-grid {
    grid-template-columns: 1fr;
  }
  
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 18px;
  }
  
  .header-inner {
    height: 64px;
  }
  
  .nav-links {
    display: none; /* 移动端精简头部，保障触屏空间 */
  }
  
  .hero {
    padding: 44px 0 36px;
  }
  
  .hero-title {
    font-size: 2.25rem;
  }
  
  .hero-subtitle {
    font-size: 1.02rem;
  }
  
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
    gap: 12px;
  }
  
  .hero-cta-group .btn {
    width: 100%;
    min-height: 48px;
  }
  
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  
  .reviews-grid {
    grid-template-columns: 1fr;
  }
  
  .cta-banner-title {
    font-size: 1.8rem;
  }
  
  .footer-nav {
    gap: 18px;
  }
  
  .article-content {
    padding: 28px 18px;
  }
  
  .sitemap-grid {
    grid-template-columns: 1fr;
  }
  
  .floating-pane {
    display: none; /* 移动端隐藏浮动参数面板以保持整洁 */
  }
}