/* ===================================================================
   Fastlink - Convergent Optical Beam UI System (光子汇聚超光速设计系统)
   Deep Spectrum Palette: 
     - Space Void Black: #05070a
     - Brilliant Laser Optic Cyan: #00ddff (#0df)
     - High-Frequency Electric White Luminescence: #ffffff / #e0f7ff
   纯原生无框架依赖、秒开极速、光纤电路流光、激光电容储能交互
   =================================================================== */

/* ---------------- 全局 CSS 变量（默认白天高频光感模式） ---------------- */
:root {
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  
  /* 核心光学色彩体系 */
  --laser-cyan: #00ddff;          /* Brilliant Laser Optic Cyan (#0df) */
  --laser-cyan-glow: rgba(0, 221, 255, 0.45);
  --laser-cyan-subtle: rgba(0, 221, 255, 0.12);
  --laser-blue: #0284c7;
  --laser-indigo: #4338ca;
  --electric-white: #ffffff;
  --electric-luminescence: rgba(255, 255, 255, 0.95);
  
  /* 白天模式（超晶光子白） */
  --bg-page: #f6f9fc;
  --bg-card: rgba(255, 255, 255, 0.92);
  --bg-card-hover: #ffffff;
  --bg-header: rgba(246, 249, 252, 0.88);
  --bg-subtle: #eef4f9;
  --bg-input: #ffffff;
  --bg-tag: rgba(0, 168, 204, 0.08);
  
  --text-main: #06111e;
  --text-muted: #334e68;
  --text-sub: #627d98;
  --text-inverse: #05070a;
  
  --border-color: rgba(186, 215, 233, 0.6);
  --border-highlight: rgba(0, 186, 224, 0.5);
  --circuit-glow: rgba(0, 186, 224, 0.25);
  
  --shadow-sm: 0 2px 6px rgba(6, 17, 30, 0.05);
  --shadow-md: 0 6px 18px rgba(6, 17, 30, 0.08);
  --shadow-lg: 0 16px 36px rgba(6, 17, 30, 0.12);
  --shadow-laser: 0 0 20px rgba(0, 186, 224, 0.35);

  --glass-blur: blur(14px);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --transition-speed: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

/* ---------------- 夜间深空光谱模式 (Space Void Black & Brilliant Laser Cyan) ---------------- */
[data-theme="dark"] {
  --bg-page: #05070a;            /* Space Void Black */
  --bg-card: rgba(10, 15, 24, 0.82);
  --bg-card-hover: rgba(14, 22, 36, 0.95);
  --bg-header: rgba(5, 7, 10, 0.85);
  --bg-subtle: rgba(0, 221, 255, 0.04);
  --bg-input: #0d131f;
  --bg-tag: rgba(0, 221, 255, 0.12);
  
  --text-main: #f0fdf4;
  --text-muted: #94a3b8;
  --text-sub: #64748b;
  --text-inverse: #ffffff;
  
  --border-color: rgba(0, 221, 255, 0.15);
  --border-highlight: rgba(0, 221, 255, 0.6);
  --circuit-glow: rgba(0, 221, 255, 0.4);
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.5);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.7);
  --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.85);
  --shadow-laser: 0 0 30px rgba(0, 221, 255, 0.5);
}

/* ---------------- 基础重置 ---------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

html {
  font-family: var(--font-family);
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: 86px;
}

body {
  background-color: var(--bg-page);
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color var(--transition-speed), color var(--transition-speed);
  position: relative;
  overflow-x: hidden;
}

/* 背景光纤汇聚画布 */
#beamCanvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  opacity: 0.65;
  transition: opacity 0.5s ease;
}

[data-theme="dark"] #beamCanvas {
  opacity: 0.85;
}

/* 中央超导光束微光轴线 (Central Trunk Beam Guide) */
body::after {
  content: "";
  position: fixed;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 2px;
  height: 100vh;
  background: linear-gradient(180deg, 
    rgba(0, 221, 255, 0) 0%, 
    rgba(0, 221, 255, 0.18) 25%, 
    rgba(0, 221, 255, 0.3) 50%, 
    rgba(0, 221, 255, 0.18) 75%, 
    rgba(0, 221, 255, 0) 100%);
  box-shadow: 0 0 16px rgba(0, 221, 255, 0.25);
  pointer-events: none;
  z-index: 0;
}

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

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

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

.container {
  width: 100%;
  max-width: 1220px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* ---------------- 顶部激光导航栏 ---------------- */
.site-header {
  position: sticky;
  top: 0;
  width: 100%;
  height: 74px;
  background-color: var(--bg-header);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

/* 品牌 Logo 与自动转圈火箭 */
.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.45rem;
  font-weight: 800;
  letter-spacing: -0.6px;
  color: var(--text-main);
}

.logo-icon {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: visible;
  filter: drop-shadow(0 0 8px var(--laser-cyan-glow));
  transition: transform var(--transition-speed);
}

.brand-logo:hover .logo-icon {
  transform: scale(1.1);
}

.logo-rotating {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: contain;
  display: block;
  animation: logoSpin 7s linear infinite;
  transform-origin: 50% 50%;
  will-change: transform;
}

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

.brand-name-highlight {
  color: var(--laser-cyan);
  text-shadow: 0 0 12px var(--laser-cyan-glow);
}

/* 导航目录与高亮动画 */
.nav-links {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 22px;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-muted);
  position: relative;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-speed);
}

.nav-link:hover, .nav-link.active {
  color: var(--laser-cyan);
  background: var(--laser-cyan-subtle);
  text-shadow: 0 0 8px var(--laser-cyan-glow);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 20%;
  width: 60%;
  height: 2px;
  background: var(--laser-cyan);
  box-shadow: 0 0 8px var(--laser-cyan);
  border-radius: 2px;
}

/* 推荐资讯特别高光标 */
.nav-link-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  color: #0284c7;
  font-weight: 700;
}

[data-theme="dark"] .nav-link-badge {
  color: #38bdf8;
}

.pulse-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--laser-cyan);
  box-shadow: 0 0 8px var(--laser-cyan);
  animation: pulseDot 1.5s infinite;
}

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

/* 头部操作区 */
.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* 精致半透明光感昼夜切换按钮 */
.theme-toggle-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  transition: all var(--transition-speed);
}

.theme-toggle-btn:hover {
  color: var(--laser-cyan);
  border-color: var(--laser-cyan);
  box-shadow: 0 0 14px var(--laser-cyan-glow);
  transform: translateY(-1px);
}

.theme-icon {
  width: 20px;
  height: 20px;
  transition: transform 0.45s cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

[data-theme="dark"] .sun-icon { display: none; }
[data-theme="dark"] .moon-icon { 
  display: block; 
  transform: rotate(360deg);
  color: var(--laser-cyan);
}

/* 导航 CTA 按钮 */
.btn-cta-nav {
  padding: 9px 20px;
  font-size: 0.92rem;
  font-weight: 700;
  color: #05070a !important;
  background: linear-gradient(135deg, #00ddff 0%, #38bdf8 100%);
  border-radius: var(--radius-full);
  box-shadow: 0 0 18px var(--laser-cyan-glow);
  transition: all var(--transition-speed);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid rgba(255, 255, 255, 0.4);
}

.btn-cta-nav:hover {
  box-shadow: 0 0 28px var(--laser-cyan), 0 0 10px #ffffff;
  transform: translateY(-2px);
  filter: brightness(1.08);
}

/* 移动端菜单按钮 */
.mobile-menu-btn {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  align-items: center;
  justify-content: center;
}

/* ---------------- 通用按钮系统 ---------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-weight: 700;
  border-radius: var(--radius-full);
  padding: 14px 30px;
  font-size: 1rem;
  cursor: pointer;
  text-align: center;
  transition: all var(--transition-speed);
  line-height: 1;
}

.btn-primary {
  background: linear-gradient(135deg, #00ddff 0%, #0284c7 100%);
  color: #05070a !important;
  box-shadow: 0 0 20px var(--laser-cyan-glow);
  border: 1px solid rgba(255, 255, 255, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 32px var(--laser-cyan), 0 0 12px #fff;
  filter: brightness(1.1);
}

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

.btn-secondary:hover {
  border-color: var(--laser-cyan);
  color: var(--laser-cyan);
  box-shadow: 0 0 16px var(--laser-cyan-subtle);
  transform: translateY(-2px);
}

.btn-block { width: 100%; }
.btn-lg { padding: 16px 38px; font-size: 1.08rem; }

/* ---------------- 主视觉区 (Hero Section) ---------------- */
.hero-section {
  padding: 85px 0 65px;
  text-align: center;
  position: relative;
}

.hero-pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 18px;
  border-radius: var(--radius-full);
  background: var(--bg-tag);
  border: 1px solid var(--border-highlight);
  color: var(--laser-cyan);
  font-size: 0.88rem;
  font-weight: 700;
  margin-bottom: 24px;
  box-shadow: 0 0 18px var(--laser-cyan-subtle);
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -1.2px;
  margin-bottom: 22px;
  color: var(--text-main);
}

.hero-title .brand-callout {
  color: var(--laser-cyan);
  text-shadow: 0 0 25px var(--laser-cyan-glow);
  position: relative;
  display: inline-block;
}

.hero-title .laser-text {
  background: linear-gradient(135deg, #00ddff 0%, #38bdf8 50%, #ffffff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--laser-blue);
  margin-bottom: 14px;
}

[data-theme="dark"] .hero-subtitle {
  color: #38bdf8;
  text-shadow: 0 0 10px rgba(56, 189, 248, 0.4);
}

.hero-intro {
  font-size: 1.08rem;
  color: var(--text-muted);
  max-width: 820px;
  margin: 0 auto 38px;
  line-height: 1.8;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin-bottom: 55px;
  flex-wrap: wrap;
}

/* 核心特性数据仪表 */
.hero-stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 1020px;
  margin: 0 auto;
  padding: 26px;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-md);
  position: relative;
}

.hero-stats-grid::before {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: var(--radius-lg);
  padding: 1px;
  background: linear-gradient(90deg, transparent, var(--laser-cyan), transparent);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

.stat-item { text-align: center; }

.stat-number {
  font-size: 2.1rem;
  font-weight: 900;
  color: var(--laser-cyan);
  text-shadow: 0 0 15px var(--laser-cyan-glow);
  line-height: 1.15;
  margin-bottom: 4px;
}

.stat-label {
  font-size: 0.86rem;
  color: var(--text-sub);
  font-weight: 600;
}

/* ---------------- 统一小节标题 ---------------- */
.section-wrapper {
  padding: 85px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 55px;
}

.section-tag {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 1.8px;
  color: var(--laser-cyan);
  text-shadow: 0 0 10px var(--laser-cyan-glow);
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.35rem;
  font-weight: 900;
  letter-spacing: -0.8px;
  line-height: 1.25;
  margin-bottom: 14px;
}

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

/* ---------------- 核心优势（3个图文卡片） ---------------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 38px 30px;
  transition: all var(--transition-speed);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: var(--laser-cyan);
  box-shadow: 0 0 25px var(--laser-cyan-subtle);
  background: var(--bg-card-hover);
}

.feature-icon-wrapper {
  width: 58px;
  height: 58px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  background: var(--laser-cyan-subtle);
  border: 1px solid var(--border-highlight);
  color: var(--laser-cyan);
  box-shadow: 0 0 15px var(--laser-cyan-glow);
  transition: transform var(--transition-speed);
}

.feature-card:hover .feature-icon-wrapper {
  transform: scale(1.12);
}

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

.feature-card-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.7;
  flex-grow: 1;
}

.feature-card-list {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px dashed var(--border-color);
  list-style: none;
}

.feature-card-list li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-sub);
  margin-bottom: 8px;
}

.check-bullet {
  color: var(--laser-cyan);
  font-weight: bold;
}

/* ---------------- 深度聚焦：流媒体 & AI 支持图卡 ---------------- */
.specialty-container {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.specialty-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 42px 36px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-speed);
}

.specialty-card:hover {
  transform: translateY(-5px);
  border-color: var(--laser-cyan);
  box-shadow: 0 0 30px var(--laser-cyan-subtle);
}

.specialty-card-header {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  margin-bottom: 22px;
}

.specialty-icon-box {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  background: var(--laser-cyan-subtle);
  border: 1px solid var(--border-highlight);
  color: var(--laser-cyan);
  box-shadow: 0 0 16px var(--laser-cyan-glow);
}

.specialty-card-title {
  font-size: 1.48rem;
  font-weight: 800;
  margin-bottom: 6px;
  color: var(--text-main);
}

.specialty-badge {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 2px 10px;
  border-radius: var(--radius-full);
  background: var(--laser-cyan-subtle);
  color: var(--laser-cyan);
  border: 1px solid var(--border-highlight);
}

.specialty-card-desc {
  font-size: 0.96rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 24px;
}

/* 解锁服务徽章墙 (Zero generic AI assistant icons, custom optical matrix badges) */
.unlock-badges-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 24px;
}

.unlock-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-main);
  transition: all var(--transition-speed);
}

.unlock-item:hover {
  border-color: var(--laser-cyan);
  background: var(--bg-card);
  box-shadow: 0 0 12px var(--laser-cyan-subtle);
  transform: translateY(-2px);
}

.optical-node-icon {
  width: 14px;
  height: 14px;
  color: var(--laser-cyan);
  flex-shrink: 0;
}

.specialty-footer-note {
  font-size: 0.86rem;
  color: var(--text-sub);
  display: flex;
  align-items: center;
  gap: 6px;
}

/* ---------------- 套餐价格对比表 (真实的网上套餐价格 + 激光电容交互) ---------------- */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  align-items: stretch;
}

/* 电路流光容器 (Hovering wraps container border in high-velocity optical circuit streams) */
.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;
  position: relative;
  transition: all var(--transition-speed);
  overflow: hidden;
  z-index: 1;
}

/* 高速光纤电路流光边框动效 */
.pricing-card::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: conic-gradient(
    transparent,
    transparent 15%,
    var(--laser-cyan) 30%,
    #ffffff 35%,
    var(--laser-cyan) 40%,
    transparent 55%
  );
  opacity: 0;
  transform: rotate(0deg);
  pointer-events: none;
  z-index: -1;
  transition: opacity 0.4s ease;
}

.pricing-card:hover::before {
  opacity: 1;
  animation: circuitStreamSpin 3s linear infinite;
}

.pricing-card::after {
  content: "";
  position: absolute;
  inset: 2px;
  background: var(--bg-card);
  border-radius: calc(var(--radius-lg) - 2px);
  z-index: -1;
}

@keyframes circuitStreamSpin {
  100% {
    transform: rotate(360deg);
  }
}

.pricing-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 0 35px var(--circuit-glow);
  border-color: transparent;
}

/* 热门推荐卡片 */
.pricing-card.popular {
  border: 1px solid var(--laser-cyan);
  box-shadow: 0 0 25px var(--laser-cyan-subtle);
  transform: scale(1.03);
  z-index: 2;
}

.pricing-card.popular:hover {
  transform: scale(1.03) translateY(-8px);
  box-shadow: 0 0 45px var(--circuit-glow);
}

/* 套餐顶部标签与热门推荐徽章 (完全内置，彻底解决 overflow: hidden 导致的上边框切字遮挡问题) */
.plan-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  align-self: center;
  background: var(--laser-cyan-subtle);
  color: var(--laser-cyan);
  border: 1px solid var(--border-highlight);
  padding: 5px 16px;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 700;
  white-space: nowrap;
  margin-bottom: 16px;
  width: fit-content;
  line-height: 1.4;
}

.popular-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  align-self: center;
  background: linear-gradient(135deg, #00ddff 0%, #0284c7 100%);
  color: #05070a;
  padding: 6px 20px;
  border-radius: var(--radius-full);
  font-size: 0.84rem;
  font-weight: 800;
  letter-spacing: 0.5px;
  white-space: nowrap;
  box-shadow: 0 0 16px var(--laser-cyan-glow);
  border: 1px solid rgba(255, 255, 255, 0.7);
  margin-bottom: 16px;
  width: fit-content;
  line-height: 1.4;
}


.pricing-plan-name {
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: 6px;
  color: var(--text-main);
}

.pricing-plan-desc {
  font-size: 0.88rem;
  color: var(--text-sub);
  margin-bottom: 20px;
  min-height: 42px;
}

.pricing-price-wrapper {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 12px;
}

.pricing-currency {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--laser-cyan);
}

.pricing-amount {
  font-size: 2.9rem;
  font-weight: 900;
  color: var(--text-main);
  line-height: 1;
}

.pricing-period {
  font-size: 0.92rem;
  color: var(--text-sub);
  font-weight: 600;
}

/* 激光电容储能与吞吐量仪表 (Laser Capacitor Throughput Meter) */
.capacitor-meter-wrapper {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  margin-bottom: 22px;
  transition: all var(--transition-speed);
}

.pricing-card:hover .capacitor-meter-wrapper {
  border-color: var(--laser-cyan);
  box-shadow: 0 0 14px var(--laser-cyan-subtle);
}

.capacitor-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-sub);
  margin-bottom: 6px;
}

.capacitor-val {
  color: var(--laser-cyan);
  font-weight: 800;
  letter-spacing: 0.5px;
}

.capacitor-track {
  width: 100%;
  height: 6px;
  background: rgba(0, 221, 255, 0.1);
  border-radius: var(--radius-full);
  overflow: hidden;
  position: relative;
}

.capacitor-fill {
  height: 100%;
  width: 60%;
  background: linear-gradient(90deg, #0284c7 0%, var(--laser-cyan) 80%, #ffffff 100%);
  border-radius: var(--radius-full);
  box-shadow: 0 0 10px var(--laser-cyan);
  transition: width 0.7s cubic-bezier(0.2, 0.8, 0.2, 1);
}

/* 悬停时电容自动充满至 100% 激光等离子充能态 */
.pricing-card:hover .capacitor-fill {
  width: 100% !important;
  box-shadow: 0 0 16px var(--laser-cyan), 0 0 6px #ffffff;
}

.pricing-features-list {
  list-style: none;
  margin-bottom: 28px;
  flex-grow: 1;
}

.pricing-features-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.pricing-features-list li svg {
  flex-shrink: 0;
  color: var(--laser-cyan);
}

/* ---------------- 用户评价 ---------------- */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 26px;
  transition: all var(--transition-speed);
}

.review-card:hover {
  transform: translateY(-5px);
  border-color: var(--laser-cyan);
  box-shadow: 0 0 20px var(--laser-cyan-subtle);
}

.review-stars {
  display: flex;
  gap: 4px;
  color: #fbbf24;
  margin-bottom: 14px;
}

.review-text {
  font-size: 0.94rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 20px;
}

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

.user-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, #00ddff 0%, #0284c7 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #05070a;
  font-weight: 800;
  font-size: 1rem;
}

.user-meta-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
}

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

/* ---------------- 常见问题 (FAQ) ---------------- */
.faq-container {
  max-width: 840px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: 14px;
  overflow: hidden;
  transition: all var(--transition-speed);
}

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

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  text-align: left;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  background: transparent;
  cursor: pointer;
  transition: color var(--transition-speed);
}

.faq-question:hover {
  color: var(--laser-cyan);
}

.faq-chevron {
  width: 20px;
  height: 20px;
  color: var(--text-sub);
  transition: transform var(--transition-speed);
  flex-shrink: 0;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease-out, padding 0.35s ease;
  padding: 0 24px;
  color: var(--text-muted);
  font-size: 0.94rem;
  line-height: 1.75;
}

.faq-item.active .faq-answer {
  max-height: 320px;
  padding: 0 24px 22px 24px;
}

/* ---------------- 底部极速号召横幅 ---------------- */
.bottom-cta-banner {
  background: linear-gradient(135deg, rgba(2, 132, 199, 0.9) 0%, rgba(0, 221, 255, 0.85) 100%);
  border-radius: var(--radius-lg);
  padding: 56px 40px;
  text-align: center;
  color: #05070a;
  margin-top: 40px;
  box-shadow: 0 0 40px var(--laser-cyan-glow);
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.4);
}

.bottom-cta-banner h2 {
  font-size: 2.3rem;
  font-weight: 900;
  margin-bottom: 14px;
}

.bottom-cta-banner p {
  font-size: 1.12rem;
  font-weight: 600;
  opacity: 0.95;
  max-width: 680px;
  margin: 0 auto 30px;
}

.btn-dark {
  background: #05070a;
  color: #ffffff !important;
  font-weight: 700;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
  border: 1px solid var(--laser-cyan);
}

.btn-dark:hover {
  background: #0d131f;
  transform: translateY(-2px);
  box-shadow: 0 0 25px var(--laser-cyan);
}

/* ---------------- 页脚 (严格仅保留四个标题) ---------------- */
.site-footer {
  margin-top: auto;
  border-top: 1px solid var(--border-color);
  background: var(--bg-card);
  padding: 42px 0 32px;
  transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.footer-link {
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--text-muted);
  transition: all var(--transition-speed);
  position: relative;
}

.footer-link:hover {
  color: var(--laser-cyan);
  text-shadow: 0 0 10px var(--laser-cyan-glow);
}

.footer-copy {
  text-align: center;
  font-size: 0.86rem;
  color: var(--text-sub);
}

/* ---------------- 推荐资讯 & 子页面通用模块 ---------------- */
.page-hero {
  padding: 55px 0 40px;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-subtle);
  margin-bottom: 40px;
}

.page-hero-title {
  font-size: 2.6rem;
  font-weight: 900;
  margin-bottom: 14px;
  letter-spacing: -0.6px;
}

.page-hero-desc {
  font-size: 1.08rem;
  color: var(--text-muted);
  max-width: 720px;
  margin: 0 auto;
}

.page-content-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 48px;
  margin-bottom: 60px;
  box-shadow: var(--shadow-sm);
}

.page-section-block {
  margin-bottom: 40px;
}

.page-section-block:last-child {
  margin-bottom: 0;
}

.page-section-title {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-section-title::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 22px;
  background: var(--laser-cyan);
  box-shadow: 0 0 8px var(--laser-cyan);
  border-radius: 2px;
}

.page-text {
  font-size: 0.98rem;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 14px;
}

.page-list {
  padding-left: 20px;
  margin-bottom: 16px;
  color: var(--text-muted);
}

.page-list li {
  margin-bottom: 8px;
  line-height: 1.7;
}

.highlight-box {
  background: var(--laser-cyan-subtle);
  border-left: 4px solid var(--laser-cyan);
  padding: 18px 22px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 20px 0;
  color: var(--text-main);
  font-size: 0.95rem;
  line-height: 1.75;
}

.prohibition-box {
  background: rgba(239, 68, 68, 0.08);
  border-left: 4px solid #ef4444;
  padding: 18px 22px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 20px 0;
  color: var(--text-main);
  font-size: 0.95rem;
  line-height: 1.75;
}

/* 资讯专栏卡片网格 */
.insights-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  margin-bottom: 40px;
}

.insight-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: all var(--transition-speed);
  display: flex;
  flex-direction: column;
}

.insight-card:hover {
  transform: translateY(-5px);
  border-color: var(--laser-cyan);
  box-shadow: 0 0 25px var(--laser-cyan-subtle);
}

.insight-tag-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.insight-category {
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
  color: var(--laser-cyan);
  background: var(--laser-cyan-subtle);
  padding: 2px 10px;
  border-radius: var(--radius-full);
}

.insight-date {
  font-size: 0.82rem;
  color: var(--text-sub);
}

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

.insight-summary {
  font-size: 0.94rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 20px;
  flex-grow: 1;
}

.insight-cta {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--laser-cyan);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* 网站地图网格 */
.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.sitemap-card {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
}

.sitemap-card h3 {
  font-size: 1.2rem;
  font-weight: 800;
  margin-bottom: 14px;
  color: var(--text-main);
}

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

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

.sitemap-card ul li a {
  color: var(--laser-cyan);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.sitemap-card ul li a:hover {
  text-decoration: underline;
}

/* ---------------- 深度 SEO 科普文章通用版式 ---------------- */
.article-wrapper {
  max-width: 920px;
  margin: 40px auto 60px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 50px 45px;
  box-shadow: var(--shadow-sm);
  position: relative;
  z-index: 1;
}

.article-header {
  margin-bottom: 35px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 25px;
}

.article-title {
  font-size: 2.3rem;
  font-weight: 900;
  line-height: 1.35;
  color: var(--text-main);
  margin: 16px 0;
  letter-spacing: -0.5px;
}

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

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

/* 文章目录 (Table of Contents) */
.article-toc {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--laser-cyan);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  margin: 30px 0 40px;
}

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

.article-toc ul {
  list-style: none;
  padding-left: 6px;
}

.article-toc ul li {
  margin-bottom: 10px;
  font-size: 0.95rem;
}

.article-toc ul li a {
  color: var(--text-muted);
  font-weight: 600;
  transition: all var(--transition-speed);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.article-toc ul li a:hover {
  color: var(--laser-cyan);
  text-decoration: underline;
  transform: translateX(4px);
}

/* 深度正文样式 */
.article-body {
  font-size: 1.05rem;
  line-height: 1.9;
  color: var(--text-muted);
}

.article-body h2 {
  font-size: 1.65rem;
  font-weight: 900;
  color: var(--text-main);
  margin: 44px 0 18px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--laser-cyan-subtle);
  display: flex;
  align-items: center;
  gap: 10px;
}

.article-body h2::before {
  content: "";
  display: inline-block;
  width: 5px;
  height: 22px;
  background: var(--laser-cyan);
  border-radius: 2px;
  box-shadow: 0 0 8px var(--laser-cyan);
}

.article-body h3 {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-main);
  margin: 28px 0 14px;
}

.article-body p {
  margin-bottom: 20px;
}

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

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

.article-body a:hover {
  text-shadow: 0 0 8px var(--laser-cyan-glow);
}

/* 文章表格 */
.article-table-wrapper {
  overflow-x: auto;
  margin: 26px 0;
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  font-size: 0.94rem;
}

.article-table th,
.article-table td {
  padding: 14px 18px;
  border: 1px solid var(--border-color);
  text-align: left;
}

.article-table th {
  background: var(--bg-subtle);
  font-weight: 800;
  color: var(--text-main);
}

/* 常见问题模块 (FAQ in Article) */
.article-faq-section {
  margin-top: 50px;
  padding-top: 30px;
  border-top: 1px solid var(--border-color);
}

.article-faq-section h2 {
  margin-bottom: 24px;
}

/* 相关阅读模块 */
.article-related-section {
  margin-top: 50px;
  padding-top: 35px;
  border-top: 1px dashed var(--border-color);
}

.article-related-section h3 {
  font-size: 1.35rem;
  font-weight: 900;
  color: var(--text-main);
  margin-bottom: 20px;
}

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

.related-card {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px 22px;
  transition: all var(--transition-speed);
  display: flex;
  flex-direction: column;
}

.related-card:hover {
  border-color: var(--laser-cyan);
  background: var(--bg-card);
  transform: translateY(-3px);
  box-shadow: 0 0 18px var(--laser-cyan-subtle);
}

.related-card h4 {
  font-size: 1.05rem;
  font-weight: 800;
  margin-bottom: 8px;
  color: var(--text-main);
  line-height: 1.45;
}

.related-card p {
  font-size: 0.88rem;
  color: var(--text-sub);
  line-height: 1.6;
  margin-bottom: 12px;
  flex-grow: 1;
}

.related-card a {
  color: var(--laser-cyan);
  font-weight: 700;
  font-size: 0.88rem;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* ---------------- 响应式媒体查询适配 (@media) ---------------- */

@media (max-width: 1024px) {
  .hero-title { font-size: 2.8rem; }
  
  .features-grid,
  .pricing-grid,
  .reviews-grid,
  .insights-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .pricing-card.popular { transform: none; }
  .pricing-card.popular:hover { transform: translateY(-8px); }
  .specialty-container { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .site-header { height: 66px; }
  
  .nav-links {
    position: fixed;
    top: 66px;
    left: 0;
    width: 100%;
    background: var(--bg-header);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--border-color);
    flex-direction: column;
    padding: 20px 24px;
    gap: 12px;
    box-shadow: var(--shadow-lg);
    transform: translateY(-150%);
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s ease-in-out;
  }

  .nav-links.active {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .mobile-menu-btn { display: flex; }

  .hero-section { padding: 55px 0 45px; }
  .hero-title { font-size: 2.2rem; }
  .hero-subtitle { font-size: 1.1rem; }
  .hero-intro { font-size: 0.98rem; margin-bottom: 28px; }

  .hero-cta-group {
    flex-direction: column;
    gap: 12px;
    width: 100%;
  }

  .hero-cta-group .btn {
    width: 100%;
    min-height: 48px;
  }

  .hero-stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
    padding: 18px;
  }

  .stat-number { font-size: 1.6rem; }

  .features-grid,
  .pricing-grid,
  .reviews-grid,
  .insights-grid,
  .sitemap-grid {
    grid-template-columns: 1fr;
  }

  .section-title { font-size: 1.85rem; }
  .unlock-badges-grid { grid-template-columns: repeat(2, 1fr); }
  .page-content-box { padding: 24px 18px; }
  .bottom-cta-banner { padding: 40px 22px; }
  .bottom-cta-banner h2 { font-size: 1.7rem; }
  .footer-nav { gap: 20px; }
  .footer-link { font-size: 0.95rem; }
}

@media (max-width: 480px) {
  .hero-title { font-size: 1.9rem; }
  .hero-stats-grid { grid-template-columns: 1fr; gap: 12px; }
  .unlock-badges-grid { grid-template-columns: 1fr; }
  .btn { font-size: 0.95rem; padding: 12px 22px; }
}