/* ==========================================================================
   超实惠机场 (CSH Airport) - Pressurized Crystal & Fluid Liquid-Cooling UI
   深海深壕黑 (#04070c) / 高亮冷却荧光靛蓝 (#0055ff) / 冰晶翡翠绿 (#10b981) / 棱镜白
   纯原生 HTML5 + CSS3 + 极轻量原生微交互，秒开级极速响应
   ========================================================================== */

:root {
  /* 基础配色 - 白天浅色模式 (晶体白玉与冰蓝冷液) */
  --bg-deep: #f0f4f9;
  --bg-subsurface: #e5edf6;
  --bg-card: rgba(255, 255, 255, 0.78);
  --bg-card-hover: rgba(255, 255, 255, 0.92);
  --bg-card-active: #ffffff;
  --bg-nav: rgba(240, 244, 249, 0.82);
  
  --border-quartz: rgba(0, 85, 255, 0.14);
  --border-quartz-strong: rgba(0, 85, 255, 0.28);
  --border-specular: rgba(255, 255, 255, 0.9);
  
  --text-main: #060e1d;
  --text-sub: #1e293b;
  --text-muted: #475569;
  
  --coolant-blue: #0055ff;
  --coolant-blue-glow: rgba(0, 85, 255, 0.25);
  --coolant-gradient: linear-gradient(135deg, #0055ff 0%, #00a2ff 100%);
  --coolant-subtle: rgba(0, 85, 255, 0.08);
  
  --emerald-indicator: #10b981;
  --emerald-glow: rgba(16, 185, 129, 0.35);
  --emerald-subtle: rgba(16, 185, 129, 0.1);
  
  --quartz-shadow: 0 10px 30px -10px rgba(0, 85, 255, 0.1), 0 20px 40px -15px rgba(6, 14, 29, 0.07);
  --quartz-shadow-hover: 0 20px 45px -8px rgba(0, 85, 255, 0.22), 0 2px 4px rgba(255, 255, 255, 0.8) inset;
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;
  
  --container-width: 1220px;
  --transition-speed: 0.35s;
}

/* 夜间深色模式 - 深海深壕黑 (#04070c) & 荧光冷却液 & 压制石英厚板 */
[data-theme="dark"] {
  --bg-deep: #04070c;
  --bg-subsurface: #090e18;
  --bg-card: rgba(11, 18, 30, 0.65);
  --bg-card-hover: rgba(15, 25, 42, 0.82);
  --bg-card-active: #101c30;
  --bg-nav: rgba(4, 7, 12, 0.85);
  
  --border-quartz: rgba(0, 85, 255, 0.28);
  --border-quartz-strong: rgba(0, 140, 255, 0.55);
  --border-specular: rgba(255, 255, 255, 0.14);
  
  --text-main: #f8fafc;
  --text-sub: #cbd5e1;
  --text-muted: #8395a7;
  
  --coolant-blue: #0066ff;
  --coolant-blue-glow: rgba(0, 102, 255, 0.45);
  --coolant-gradient: linear-gradient(135deg, #0055ff 0%, #00d2ff 100%);
  --coolant-subtle: rgba(0, 85, 255, 0.18);
  
  --emerald-indicator: #10b981;
  --emerald-glow: rgba(16, 185, 129, 0.5);
  --emerald-subtle: rgba(16, 185, 129, 0.16);
  
  --quartz-shadow: 0 16px 40px -10px rgba(0, 0, 0, 0.75), 0 0 25px -5px rgba(0, 85, 255, 0.15);
  --quartz-shadow-hover: 0 25px 60px -10px rgba(0, 0, 0, 0.9), 0 0 35px 2px rgba(0, 102, 255, 0.32);
}

/* CSS Reset & 基础设置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px; /* 锚点滚动留白，确保不被吸顶页眉遮挡 */
  font-size: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-deep);
  color: var(--text-main);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
  overflow-x: hidden;
  position: relative;
}

/* 深海液冷流动背景网格与环境光 */
.subsea-ambient-grid {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 880px;
  background: 
    radial-gradient(ellipse 65% 50% at 50% 0%, var(--coolant-blue-glow) 0%, transparent 75%),
    linear-gradient(to bottom, transparent 80%, var(--bg-deep) 100%),
    repeating-linear-gradient(0deg, transparent, transparent 47px, rgba(0, 85, 255, 0.03) 48px, transparent 49px),
    repeating-linear-gradient(90deg, transparent, transparent 47px, rgba(0, 85, 255, 0.03) 48px, transparent 49px);
  pointer-events: none;
  z-index: 0;
}

.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 2;
}

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

/* ==========================================================================
   吸顶页眉导航 Site Header
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--bg-nav);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-quartz);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  transition: background-color var(--transition-speed) ease, border-color var(--transition-speed) ease;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
  gap: 16px;
}

/* 品牌 Logo (晶体厚块与品牌标志) */
.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.28rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-main);
  flex-shrink: 0;
  text-decoration: none;
}

.site-logo-img {
  height: 42px;
  width: auto;
  max-width: 175px;
  object-fit: contain;
  display: block;
  border-radius: var(--radius-sm);
  transition: transform 0.25s ease, filter 0.25s ease;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.18);
}

.brand-logo:hover .site-logo-img {
  transform: scale(1.03);
  filter: drop-shadow(0 0 12px var(--coolant-blue-glow));
}

.brand-icon-crystal {
  width: 38px;
  height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--coolant-gradient);
  border-radius: var(--radius-sm);
  color: #ffffff;
  box-shadow: 0 0 16px var(--coolant-blue-glow), inset 0 1px 1px var(--border-specular);
  border: 1px solid rgba(255, 255, 255, 0.3);
  position: relative;
  overflow: hidden;
}

.brand-icon-crystal svg {
  width: 22px;
  height: 22px;
  fill: currentColor;
}

/* 导航目录 (首页 + 每个锚点板块 + 推荐资讯) */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 20px;
  list-style: none;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-muted);
  position: relative;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  transition: color 0.25s ease, background 0.25s ease;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.nav-link:hover, .nav-link.active {
  color: var(--coolant-blue);
  background: var(--coolant-subtle);
}

/* “推荐资讯”高亮徽章标记 */
.nav-link-badge {
  font-size: 0.7rem;
  padding: 1px 6px;
  border-radius: var(--radius-full);
  background: var(--coolant-gradient);
  color: #ffffff;
  font-weight: 700;
  margin-left: 2px;
  letter-spacing: 0.02em;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-shrink: 0;
}

/* 精致且专业化的透明昼夜模式切换按钮 */
.theme-toggle-btn {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-quartz-strong);
  width: 42px;
  height: 42px;
  border-radius: var(--radius-full);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-sub);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: inset 0 1px 1px var(--border-specular);
  outline: none;
}

.theme-toggle-btn:hover {
  background: var(--coolant-subtle);
  color: var(--coolant-blue);
  border-color: var(--coolant-blue);
  box-shadow: 0 0 15px var(--coolant-blue-glow);
  transform: scale(1.06);
}

.theme-toggle-btn svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.icon-moon { display: block; }
.icon-sun { display: none; }

[data-theme="dark"] .icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: block; }

/* 统一按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: var(--radius-md);
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
  white-space: nowrap;
}

.btn-coolant-blue {
  background: var(--coolant-gradient);
  color: #ffffff !important;
  box-shadow: 0 4px 18px var(--coolant-blue-glow), inset 0 1px 1px rgba(255, 255, 255, 0.4);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-coolant-blue:hover {
  box-shadow: 0 8px 26px var(--coolant-blue-glow), inset 0 1px 2px rgba(255, 255, 255, 0.6);
  transform: translateY(-2px);
  filter: brightness(1.08);
}

.btn-quartz {
  background: var(--bg-card);
  color: var(--text-main);
  border: 1px solid var(--border-quartz-strong);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: var(--quartz-shadow);
}

.btn-quartz:hover {
  border-color: var(--coolant-blue);
  color: var(--coolant-blue);
  transform: translateY(-2px);
  box-shadow: var(--quartz-shadow-hover);
}

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

.btn-block {
  width: 100%;
}

/* ==========================================================================
   主视觉区 Hero Section (Pressurized Crystal Layout)
   ========================================================================== */
.hero-section {
  padding: 85px 0 70px;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}

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

/* 左上方特征标签：• 赠送独家EMBY影视库 */
.feature-status-tab {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: var(--emerald-subtle);
  border: 1px solid rgba(16, 185, 129, 0.4);
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--emerald-indicator);
  margin-bottom: 24px;
  box-shadow: 0 0 12px var(--emerald-glow);
}

/* 冰绿高亮脉冲点 */
.pulse-emerald-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--emerald-indicator);
  box-shadow: 0 0 8px var(--emerald-indicator);
  display: inline-block;
  animation: pulseEmerald 2s infinite ease-in-out;
}

@keyframes pulseEmerald {
  0% { transform: scale(0.95); opacity: 0.7; }
  50% { transform: scale(1.25); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.7; }
}

/* 大标题包含品牌名，斜体质感 */
.hero-title {
  font-size: 3.4rem;
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -0.035em;
  margin-bottom: 22px;
  color: var(--text-main);
}

.hero-title .brand-italic {
  font-style: italic;
  background: var(--coolant-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
  padding-right: 6px;
  text-shadow: 0 0 30px var(--coolant-blue-glow);
}

.hero-subtitle {
  font-size: 1.18rem;
  color: var(--text-sub);
  line-height: 1.75;
  margin-bottom: 38px;
  max-width: 640px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-bottom: 36px;
}

/* 右侧深海液冷与石英服务器监控块 (Underwater Stability HUD) */
.underwater-hud-slab {
  background: var(--bg-card);
  border: 1px solid var(--border-quartz-strong);
  border-radius: var(--radius-xl);
  padding: 32px;
  box-shadow: var(--quartz-shadow);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  position: relative;
  overflow: hidden;
  box-shadow: inset 0 1px 1px var(--border-specular), var(--quartz-shadow);
}

/* 液冷管路流动光效 */
.coolant-pipe-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-quartz);
  padding-bottom: 16px;
  margin-bottom: 20px;
}

.hud-title {
  font-size: 0.86rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--coolant-blue);
  display: flex;
  align-items: center;
  gap: 6px;
}

.hud-live-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  color: var(--emerald-indicator);
  font-weight: 700;
}

/* 实时指标仪表盘 */
.hud-metrics-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 24px;
}

.metric-pill {
  background: rgba(0, 85, 255, 0.05);
  border: 1px solid var(--border-quartz);
  border-radius: var(--radius-md);
  padding: 12px;
  text-align: center;
}

.metric-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  display: block;
  margin-bottom: 4px;
  font-weight: 600;
}

.metric-val {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-main);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

.metric-val.emerald {
  color: var(--emerald-indicator);
}

/* 0 Jitter 极平冷酷线条与实时示波动画 */
.jitter-stabilizer {
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--border-quartz);
  border-radius: var(--radius-md);
  padding: 16px;
  position: relative;
}

.jitter-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  margin-bottom: 12px;
}

.jitter-status-text {
  font-weight: 700;
  color: var(--emerald-indicator);
}

.jitter-line-svg {
  width: 100%;
  height: 48px;
}

.laser-jitter-path {
  stroke: var(--emerald-indicator);
  stroke-width: 2.5;
  fill: none;
  filter: drop-shadow(0 0 6px var(--emerald-indicator));
}

/* ==========================================================================
   板块统一规范 Section
   ========================================================================== */
.section {
  padding: 85px 0;
  position: relative;
}

.section-alt {
  background: var(--bg-subsurface);
  border-top: 1px solid var(--border-quartz);
  border-bottom: 1px solid var(--border-quartz);
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--coolant-blue);
  margin-bottom: 12px;
  background: var(--coolant-subtle);
  padding: 4px 14px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-quartz);
}

.section-title {
  font-size: 2.35rem;
  font-weight: 900;
  letter-spacing: -0.025em;
  margin-bottom: 16px;
  color: var(--text-main);
}

.section-desc {
  font-size: 1.08rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ==========================================================================
   产品核心优势介绍（3个多平面石英厚块图文卡片）
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

/* 模拟斯涅尔定律折射与彩光色散微交互卡片 */
.quartz-card {
  background: var(--bg-card);
  border: 1px solid var(--border-quartz-strong);
  border-radius: var(--radius-lg);
  padding: 38px 30px;
  box-shadow: var(--quartz-shadow), inset 0 1px 1px var(--border-specular);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  display: flex;
  flex-direction: column;
  transition: transform 0.35s cubic-bezier(0.2, 0, 0, 1), box-shadow 0.35s ease, border-color 0.35s ease;
  position: relative;
  overflow: hidden;
}

/* 棱镜色散边缘光 */
.quartz-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--coolant-blue), var(--emerald-indicator), transparent);
  opacity: 0;
  transition: opacity 0.35s ease;
}

.quartz-card:hover {
  transform: translateY(-8px);
  border-color: var(--coolant-blue);
  box-shadow: var(--quartz-shadow-hover);
  background: var(--bg-card-hover);
}

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

.feature-icon-crystal {
  width: 58px;
  height: 58px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  background: var(--coolant-subtle);
  color: var(--coolant-blue);
  border: 1px solid var(--border-quartz-strong);
  box-shadow: inset 0 1px 1px var(--border-specular);
}

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

.feature-title {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--text-main);
}

.feature-text {
  font-size: 0.98rem;
  color: var(--text-sub);
  line-height: 1.7;
  margin-bottom: 22px;
  flex-grow: 1;
}

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

.feature-list-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.92rem;
  color: var(--text-muted);
}

.feature-list-item svg {
  width: 16px;
  height: 16px;
  color: var(--emerald-indicator);
  flex-shrink: 0;
}

/* ==========================================================================
   流媒体图卡 & AI 支持图卡 (严禁 AI 火花与机器人图标)
   ========================================================================== */
.showcase-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.showcase-quartz-card {
  background: var(--bg-card);
  border: 1px solid var(--border-quartz-strong);
  border-radius: var(--radius-xl);
  padding: 42px;
  box-shadow: var(--quartz-shadow), inset 0 1px 1px var(--border-specular);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  transition: all 0.35s ease;
  position: relative;
  overflow: hidden;
}

.showcase-quartz-card:hover {
  transform: translateY(-6px);
  border-color: var(--coolant-blue);
  box-shadow: var(--quartz-shadow-hover);
}

.showcase-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 22px;
}

.showcase-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 14px;
  background: var(--coolant-subtle);
  color: var(--coolant-blue);
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 800;
  border: 1px solid var(--border-quartz);
}

.showcase-title {
  font-size: 1.68rem;
  font-weight: 900;
  margin-bottom: 14px;
  color: var(--text-main);
}

.showcase-desc {
  font-size: 1.02rem;
  color: var(--text-sub);
  line-height: 1.7;
  margin-bottom: 28px;
}

.badge-grid-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.service-pill-crystal {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  background: var(--bg-card-active);
  border: 1px solid var(--border-quartz);
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-main);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05), inset 0 1px 1px var(--border-specular);
  transition: all 0.25s ease;
}

.service-pill-crystal:hover {
  border-color: var(--coolant-blue);
  color: var(--coolant-blue);
  transform: translateY(-2px);
  box-shadow: 0 4px 14px var(--coolant-blue-glow);
}

.service-pill-crystal svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

/* ==========================================================================
   真实套餐价格对比表 Pricing Table
   ========================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

.pricing-quartz-card {
  background: var(--bg-card);
  border: 1px solid var(--border-quartz-strong);
  border-radius: var(--radius-xl);
  padding: 42px 32px;
  box-shadow: var(--quartz-shadow), inset 0 1px 1px var(--border-specular);
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.35s cubic-bezier(0.2, 0, 0, 1);
  backdrop-filter: blur(20px);
}

.pricing-quartz-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--quartz-shadow-hover);
}

/* 热门推荐（爆款高亮卡片） */
.pricing-quartz-card.featured {
  border: 2px solid var(--coolant-blue);
  box-shadow: 0 15px 45px -5px var(--coolant-blue-glow), inset 0 1px 2px var(--border-specular);
}

.pricing-top-tag {
  position: absolute;
  top: -15px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--coolant-gradient);
  color: #ffffff;
  padding: 5px 20px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  box-shadow: 0 4px 12px var(--coolant-blue-glow);
  white-space: nowrap;
}

.pricing-header {
  text-align: center;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-quartz);
  margin-bottom: 24px;
}

.pricing-plan-name {
  font-size: 1.38rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.pricing-plan-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.pricing-price-box {
  margin: 18px 0 8px;
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
}

.pricing-currency {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--coolant-blue);
}

.pricing-amount {
  font-size: 3.2rem;
  font-weight: 900;
  line-height: 1;
  color: var(--text-main);
  letter-spacing: -0.04em;
}

.pricing-period {
  font-size: 0.95rem;
  color: var(--text-muted);
  font-weight: 600;
}

.pricing-per-month {
  font-size: 0.82rem;
  color: var(--emerald-indicator);
  font-weight: 700;
  margin-top: 4px;
}

.pricing-feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 32px;
  flex-grow: 1;
}

.pricing-feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.95rem;
  color: var(--text-sub);
}

.pricing-feature-item svg {
  width: 18px;
  height: 18px;
  color: var(--emerald-indicator);
  flex-shrink: 0;
}

.pricing-feature-item.highlight {
  font-weight: 700;
  color: var(--text-main);
}

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

.review-quartz-card {
  background: var(--bg-card);
  border: 1px solid var(--border-quartz-strong);
  border-radius: var(--radius-lg);
  padding: 34px 28px;
  box-shadow: var(--quartz-shadow);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  backdrop-filter: blur(18px);
  transition: transform 0.3s ease;
}

.review-quartz-card:hover {
  transform: translateY(-5px);
  border-color: var(--coolant-blue);
}

.review-stars-row {
  display: flex;
  gap: 4px;
  margin-bottom: 16px;
  color: #f59e0b;
}

.review-stars-row svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

.review-text {
  font-size: 0.98rem;
  color: var(--text-sub);
  line-height: 1.7;
  margin-bottom: 24px;
  font-style: italic;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 14px;
  border-top: 1px solid var(--border-quartz);
  padding-top: 18px;
}

.author-avatar {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: var(--coolant-subtle);
  color: var(--coolant-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.15rem;
  border: 1px solid var(--border-quartz-strong);
}

.author-info h4 {
  font-size: 1rem;
  font-weight: 800;
  color: var(--text-main);
}

.author-info span {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ==========================================================================
   常见问题解答 FAQ
   ========================================================================== */
.faq-accordion {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item-quartz {
  background: var(--bg-card);
  border: 1px solid var(--border-quartz-strong);
  border-radius: var(--radius-md);
  box-shadow: var(--quartz-shadow);
  overflow: hidden;
  transition: all 0.25s ease;
}

.faq-item-quartz:hover {
  border-color: var(--coolant-blue);
}

.faq-summary {
  padding: 22px 26px;
  font-size: 1.1rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  list-style: none;
  user-select: none;
  color: var(--text-main);
}

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

.faq-icon-arrow {
  width: 20px;
  height: 20px;
  color: var(--coolant-blue);
  transition: transform 0.25s ease;
  flex-shrink: 0;
}

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

details[open] {
  border-color: var(--coolant-blue);
  background: var(--bg-card-hover);
}

.faq-answer {
  padding: 0 26px 24px;
  font-size: 1rem;
  color: var(--text-sub);
  line-height: 1.75;
}

/* ==========================================================================
   页脚规范 (严格只保留四个标题，在新页面打开)
   ========================================================================== */
.site-footer {
  border-top: 1px solid var(--border-quartz);
  background: var(--bg-nav);
  padding: 52px 0 42px;
  margin-top: 60px;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 26px;
  text-align: center;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  flex-wrap: wrap;
}

.footer-link {
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--text-sub);
  position: relative;
  padding: 6px 4px;
  transition: color 0.25s ease;
}

.footer-link:hover {
  color: var(--coolant-blue);
}

.footer-copyright {
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* ==========================================================================
   独立文章模板与推荐资讯样式
   ========================================================================== */
.article-hub-header {
  text-align: center;
  margin-bottom: 48px;
}

.article-cards-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.article-item-card {
  background: var(--bg-card);
  border: 1px solid var(--border-quartz-strong);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--quartz-shadow);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.3s ease;
}

.article-item-card:hover {
  border-color: var(--coolant-blue);
  transform: translateY(-4px);
  box-shadow: var(--quartz-shadow-hover);
}

.article-meta-row {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.article-badge {
  background: var(--coolant-subtle);
  color: var(--coolant-blue);
  font-weight: 700;
  padding: 3px 10px;
  border-radius: var(--radius-full);
}

.article-item-title {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--text-main);
  line-height: 1.4;
}

.article-excerpt {
  font-size: 0.96rem;
  color: var(--text-sub);
  line-height: 1.7;
  margin-bottom: 20px;
  flex-grow: 1;
}

.article-read-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--coolant-blue);
  font-weight: 700;
  font-size: 0.95rem;
}

.article-read-more:hover {
  text-decoration: underline;
}

/* ==========================================================================
   响应式媒体查询适配 (@media)
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .features-grid,
  .pricing-grid,
  .reviews-grid,
  .article-cards-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .pricing-quartz-card.featured {
    grid-column: span 2;
  }
}

@media (max-width: 860px) {
  .nav-menu {
    display: none; /* 移动端隐藏较长主菜单，通过首屏锚点/底部快速触达 */
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2.35rem;
  }
  
  .hero-subtitle {
    font-size: 1.05rem;
  }
  
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  
  .hero-actions .btn {
    width: 100%;
    min-height: 52px; /* 适合手指触摸点击 */
  }
  
  .features-grid,
  .showcase-grid,
  .pricing-grid,
  .reviews-grid,
  .article-cards-grid {
    grid-template-columns: 1fr; /* 完美单栏布局 */
  }
  
  .pricing-quartz-card.featured {
    grid-column: span 1;
  }
  
  .pricing-quartz-card .btn,
  .showcase-quartz-card .btn {
    min-height: 50px;
    font-size: 1rem;
  }
  
  .footer-nav {
    flex-direction: column;
    gap: 18px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }
  
  .hero-title {
    font-size: 2.05rem;
  }
  
  .hud-metrics-row {
    grid-template-columns: 1fr;
    gap: 8px;
  }
  
  .quartz-card,
  .showcase-quartz-card,
  .pricing-quartz-card,
  .review-quartz-card,
  .article-item-card {
    padding: 26px 20px;
  }
}

/* ==========================================================================
   长篇深度 SEO 科普文章通用排版样式 (Article Single View)
   ========================================================================== */
.article-wrapper {
  max-width: 880px;
  margin: 0 auto;
  padding: 40px 0 80px;
}

.article-container {
  background: var(--bg-card);
  border: 1px solid var(--border-quartz-strong);
  border-radius: var(--radius-xl);
  padding: 48px;
  box-shadow: var(--quartz-shadow), inset 0 1px 1px var(--border-specular);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
}

.breadcrumb-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.breadcrumb-nav a {
  color: var(--text-sub);
}

.breadcrumb-nav a:hover {
  color: var(--coolant-blue);
}

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

.article-post-header {
  border-bottom: 1px solid var(--border-quartz);
  padding-bottom: 28px;
  margin-bottom: 36px;
}

.article-category-tag {
  display: inline-block;
  padding: 4px 14px;
  background: var(--coolant-subtle);
  color: var(--coolant-blue);
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  margin-bottom: 14px;
  border: 1px solid var(--border-quartz);
}

.article-main-title {
  font-size: 2.25rem;
  font-weight: 900;
  line-height: 1.3;
  letter-spacing: -0.025em;
  color: var(--text-main);
  margin-bottom: 18px;
}

.article-meta-info {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 0.88rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

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

/* 文章目录 (Table of Contents) */
.article-toc-box {
  background: var(--bg-card-active);
  border: 1px solid var(--border-quartz);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  margin: 32px 0 40px;
  box-shadow: inset 0 1px 1px var(--border-specular);
}

.toc-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toc-link {
  color: var(--text-sub);
  font-size: 0.96rem;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: color 0.2s ease, transform 0.2s ease;
}

.toc-link:hover {
  color: var(--coolant-blue);
  transform: translateX(4px);
}

/* 文章正文排版 */
.article-rich-body h2 {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-main);
  margin: 44px 0 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-quartz);
  display: flex;
  align-items: center;
  gap: 10px;
}

.article-rich-body h3 {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-main);
  margin: 28px 0 14px;
}

.article-rich-body p {
  font-size: 1.04rem;
  line-height: 1.85;
  color: var(--text-sub);
  margin-bottom: 20px;
}

.article-rich-body ul, .article-rich-body ol {
  padding-left: 24px;
  margin-bottom: 24px;
  color: var(--text-sub);
  line-height: 1.85;
}

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

.article-rich-body strong {
  color: var(--text-main);
}

.article-rich-body a {
  color: var(--coolant-blue);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.article-rich-body a:hover {
  filter: brightness(1.15);
}

/* 重点提示框与呼吁框 */
.article-callout {
  background: var(--coolant-subtle);
  border-left: 4px solid var(--coolant-blue);
  padding: 20px 24px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 28px 0;
}

.article-callout p {
  margin: 0;
  font-size: 1rem;
  color: var(--text-main);
  font-weight: 500;
}

/* 表格样式 */
.article-table-wrapper {
  overflow-x: auto;
  margin: 30px 0;
  border: 1px solid var(--border-quartz);
  border-radius: var(--radius-md);
}

.seo-compare-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.95rem;
}

.seo-compare-table th {
  background: var(--bg-card-active);
  color: var(--text-main);
  padding: 14px 18px;
  font-weight: 800;
  border-bottom: 1px solid var(--border-quartz-strong);
}

.seo-compare-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-quartz);
  color: var(--text-sub);
}

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

/* 文章内嵌入式转化卡片 */
.article-inline-cta {
  background: linear-gradient(135deg, rgba(0, 85, 255, 0.08) 0%, rgba(16, 185, 129, 0.06) 100%);
  border: 1px solid var(--border-quartz-strong);
  border-radius: var(--radius-lg);
  padding: 32px;
  text-align: center;
  margin: 48px 0;
  box-shadow: inset 0 1px 1px var(--border-specular);
}

.article-inline-cta h3 {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 10px;
}

.article-inline-cta p {
  font-size: 1rem;
  color: var(--text-sub);
  max-width: 600px;
  margin: 0 auto 22px;
}

/* 相关推荐阅读板块 */
.related-posts-section {
  margin-top: 56px;
  padding-top: 36px;
  border-top: 1px solid var(--border-quartz);
}

.related-posts-title {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 22px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.related-posts-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.related-card {
  background: var(--bg-card-active);
  border: 1px solid var(--border-quartz);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: all 0.25s ease;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.related-card:hover {
  border-color: var(--coolant-blue);
  transform: translateY(-3px);
  box-shadow: 0 6px 18px rgba(0, 85, 255, 0.12);
}

.related-card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
  line-height: 1.45;
}

.related-card-date {
  font-size: 0.82rem;
  color: var(--text-muted);
}

@media (max-width: 768px) {
  .article-container {
    padding: 28px 18px;
  }
  
  .article-main-title {
    font-size: 1.7rem;
  }
  
  .related-posts-grid {
    grid-template-columns: 1fr;
  }
}