/* ==========================================================================
   Nexitally 中文官网 - 纯原生极速 CSS 样式表 (style.css)
   - 零第三方依赖、零外部字体、纯原生极速渲染
   - 科技高级感动态背景特效架构：
     1. 3D 赛博穿梭景深网格 (Perspective Warp Grid)
     2. 全景流动极光星云光晕 (Floating Cyber Aurora Orbs)
     3. 动态高能激光地平线 (High-Speed Laser Beam)
     4. 卡片幻彩流动描边 (Card Edge Shimmer)
     5. 标题与徽章科技呼吸流光 (Breathing Cyber Glow)
   - 严格遵循 WCAG 2.1 AA 标准 (对比度 >= 4.5:1, 触控区域 >= 44px)
   ========================================================================== */

:root {
  /* 科技深邃底色 */
  --color-bg-base: #030712;
  --color-bg-primary: #050a17;
  --color-bg-secondary: #080e1d;
  --color-bg-tertiary: #0e172a;
  --color-bg-card: rgba(15, 23, 42, 0.72);
  --color-bg-card-hover: rgba(20, 32, 58, 0.88);

  /* 文本对比度标准 (>= 4.5:1) */
  --color-text-main: #f8fafc;
  --color-text-muted: #94a3b8;
  --color-text-subtle: #64748b;

  /* 科技高光与渐变色 */
  --color-accent: #38bdf8;
  --color-accent-hover: #0284c7;
  --color-accent-gradient: linear-gradient(135deg, #38bdf8 0%, #6366f1 55%, #a855f7 100%);
  --color-accent-glow: rgba(56, 189, 248, 0.35);
  --color-indigo-glow: rgba(99, 102, 241, 0.25);

  /* 科技微光边框 */
  --color-border: rgba(56, 189, 248, 0.14);
  --color-border-hover: rgba(56, 189, 248, 0.45);
  --color-border-subtle: rgba(255, 255, 255, 0.06);

  /* 功能色 */
  --color-success: #10b981;
  --color-warning: #f59e0b;

  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --container-max: 1200px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --transition-normal: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  --header-height: 72px;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* 核心科技高级感背景构建 */
html {
  font-family: var(--font-family);
  background-color: var(--color-bg-base);
  background-image: 
    radial-gradient(rgba(56, 189, 248, 0.12) 1px, transparent 1px);
  background-size: 32px 32px;
  color: var(--color-text-main);
  line-height: 1.65;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow-x: hidden;
}

/* 赛博迷宫点阵随机游走 Canvas 特效层 */
#maze-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
}

/* 背景特效 1：全景流动天青极光星云球 */
body::before {
  content: "";
  position: fixed;
  top: -160px;
  left: 15%;
  width: 680px;
  height: 680px;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.14) 0%, rgba(99, 102, 241, 0.07) 45%, transparent 70%);
  border-radius: 50%;
  filter: blur(100px);
  pointer-events: none;
  z-index: -2;
  animation: aurora-float-1 18s ease-in-out infinite alternate;
  will-change: transform;
}

/* 背景特效 2：右下侧电紫深空能量球 */
body::after {
  content: "";
  position: fixed;
  bottom: -140px;
  right: 10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.11) 0%, rgba(56, 189, 248, 0.05) 45%, transparent 70%);
  border-radius: 50%;
  filter: blur(110px);
  pointer-events: none;
  z-index: -2;
  animation: aurora-float-2 24s ease-in-out infinite alternate;
  will-change: transform;
}

@keyframes aurora-float-1 {
  0% {
    transform: translate(0, 0) scale(1);
  }
  50% {
    transform: translate(60px, 80px) scale(1.12);
  }
  100% {
    transform: translate(-40px, 120px) scale(0.92);
  }
}

@keyframes aurora-float-2 {
  0% {
    transform: translate(0, 0) scale(1);
  }
  50% {
    transform: translate(-80px, -60px) scale(1.15);
  }
  100% {
    transform: translate(40px, -100px) scale(0.95);
  }
}

/* 跳至主要内容无障碍入口 */
.skip-link {
  position: absolute;
  top: -60px;
  left: 16px;
  background: var(--color-accent);
  color: #000;
  font-weight: 700;
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  z-index: 9999;
  text-decoration: none;
  transition: top 0.2s ease;
}
.skip-link:focus {
  top: 16px;
  outline: 3px solid #fff;
}

/* 焦点无障碍支持 */
a:focus-visible, button:focus-visible, summary:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 4px;
}

/* 布局容器 */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
  position: relative;
  z-index: 2;
}

/* 锚点防遮挡 */
[id] {
  scroll-margin-top: calc(var(--header-height) + 24px);
}

/* 科技拟态导航头 */
.site-header {
  position: sticky;
  top: 0;
  height: var(--header-height);
  background: rgba(3, 7, 18, 0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
  z-index: 1000;
  display: flex;
  align-items: center;
}
.header-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.25rem;
  font-weight: 800;
  color: #fff;
  text-decoration: none;
  letter-spacing: -0.5px;
}
.site-logo svg {
  width: 36px;
  height: 36px;
  filter: drop-shadow(0 0 10px rgba(56, 189, 248, 0.45));
  transition: var(--transition-normal);
}
.site-logo:hover svg {
  transform: scale(1.08) rotate(-2deg);
  filter: drop-shadow(0 0 18px rgba(56, 189, 248, 0.8));
}
.nav-menu {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 28px;
}
.nav-link {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  padding: 8px 0;
  transition: var(--transition-normal);
  position: relative;
}
.nav-link:hover, .nav-link.active {
  color: var(--color-accent);
  text-shadow: 0 0 12px rgba(56, 189, 248, 0.5);
}

/* 按钮通用规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  min-width: 44px;
  padding: 10px 24px;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: var(--transition-normal);
  white-space: nowrap;
}
.btn-primary {
  background: var(--color-accent-gradient);
  color: #fff;
  box-shadow: 0 4px 16px var(--color-accent-glow), inset 0 1px 0 rgba(255, 255, 255, 0.25);
  position: relative;
}
.btn-primary:hover {
  opacity: 0.95;
  transform: translateY(-2px);
  box-shadow: 0 8px 26px rgba(56, 189, 248, 0.55), inset 0 1px 0 rgba(255, 255, 255, 0.4);
}
.btn-secondary {
  background: rgba(15, 23, 42, 0.7);
  color: var(--color-text-main);
  border-color: var(--color-border);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.btn-secondary:hover {
  background: rgba(30, 41, 59, 0.9);
  border-color: var(--color-accent);
  box-shadow: 0 0 18px rgba(56, 189, 248, 0.25);
}
.btn-sm {
  padding: 8px 18px;
  font-size: 0.88rem;
}

/* 主视觉区 (Hero Section) - 顶部激光地平线 + 居中辐射光晕 + 3D 穿梭网格 */
.hero-section {
  padding: 95px 0 80px;
  text-align: center;
  position: relative;
  overflow: hidden;
  background: radial-gradient(ellipse 75% 50% at 50% 0%, rgba(56, 189, 248, 0.18) 0%, rgba(99, 102, 241, 0.08) 50%, transparent 75%);
}

/* 背景特效 3：高能动态激光地平线光束 */
.hero-laser-line {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(56, 189, 248, 0.35), transparent);
  overflow: hidden;
  z-index: 2;
}
.hero-laser-line::after {
  content: "";
  position: absolute;
  top: -1px;
  left: -25%;
  width: 25%;
  height: 3px;
  background: linear-gradient(90deg, transparent, #38bdf8 50%, #ffffff 80%, transparent 100%);
  box-shadow: 0 0 18px 2px #38bdf8;
  animation: laser-pulse 4.5s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}

@keyframes laser-pulse {
  0% {
    left: -25%;
  }
  100% {
    left: 125%;
  }
}

/* 背景特效 4：3D 赛博穿梭景深网格 (Perspective Warp Grid) */
.hero-perspective-grid {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 340px;
  overflow: hidden;
  pointer-events: none;
  mask-image: linear-gradient(to top, rgba(0, 0, 0, 0.9) 0%, rgba(0, 0, 0, 0) 85%);
  -webkit-mask-image: linear-gradient(to top, rgba(0, 0, 0, 0.9) 0%, rgba(0, 0, 0, 0) 85%);
  z-index: 1;
}
.hero-perspective-grid::before {
  content: "";
  position: absolute;
  width: 200%;
  left: -50%;
  height: 100%;
  bottom: -60px;
  transform: perspective(280px) rotateX(62deg);
  background-image: 
    linear-gradient(to right, rgba(56, 189, 248, 0.18) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(56, 189, 248, 0.18) 1px, transparent 1px);
  background-size: 44px 44px;
  animation: grid-fly 16s linear infinite;
  will-change: background-position;
}

@keyframes grid-fly {
  0% {
    background-position: 0 0;
  }
  100% {
    background-position: 0 44px;
  }
}

/* 动态呼吸科技徽章 */
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.35);
  color: var(--color-accent);
  padding: 6px 20px;
  border-radius: 999px;
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 24px;
  animation: badge-glow 4s ease-in-out infinite alternate;
  position: relative;
  z-index: 2;
}

@keyframes badge-glow {
  0% {
    box-shadow: 0 0 15px rgba(56, 189, 248, 0.15), inset 0 0 10px rgba(56, 189, 248, 0.08);
    border-color: rgba(56, 189, 248, 0.35);
  }
  100% {
    box-shadow: 0 0 28px rgba(56, 189, 248, 0.45), inset 0 0 16px rgba(56, 189, 248, 0.22);
    border-color: rgba(56, 189, 248, 0.75);
  }
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.4rem);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -1px;
  margin-bottom: 20px;
  position: relative;
  z-index: 2;
}

/* 标题渐变流光特效 */
.hero-title span {
  background: linear-gradient(135deg, #38bdf8 0%, #818cf8 30%, #c084fc 60%, #38bdf8 100%);
  background-size: 250% auto;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: text-shimmer 7s linear infinite;
  filter: drop-shadow(0 0 26px rgba(56, 189, 248, 0.4));
}

@keyframes text-shimmer {
  0% { background-position: 0% center; }
  100% { background-position: 250% center; }
}

.hero-intro {
  max-width: 780px;
  margin: 0 auto 36px;
  color: var(--color-text-muted);
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  line-height: 1.7;
  position: relative;
  z-index: 2;
}
.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  position: relative;
  z-index: 2;
}
.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 800px;
  margin: 60px auto 0;
  padding: 24px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.06);
  position: relative;
  z-index: 2;
}
.stat-item h3 {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--color-accent);
  margin-bottom: 4px;
  text-shadow: 0 0 16px rgba(56, 189, 248, 0.4);
}
.stat-item p {
  color: var(--color-text-muted);
  font-size: 0.88rem;
}

/* 区块通用标题 */
.section-header {
  text-align: center;
  margin-bottom: 48px;
  position: relative;
}
.section-title {
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 12px;
}
.section-subtitle {
  color: var(--color-text-muted);
  font-size: 1rem;
  max-width: 600px;
  margin: 0 auto;
}

/* 产品核心优势 (3个卡片) */
.features-section {
  padding: 80px 0;
  position: relative;
  background: linear-gradient(180deg, rgba(8, 14, 29, 0.85) 0%, rgba(15, 23, 42, 0.6) 50%, rgba(8, 14, 29, 0.85) 100%);
  border-top: 1px solid var(--color-border-subtle);
  border-bottom: 1px solid var(--color-border-subtle);
}
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.feature-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 34px 26px;
  transition: var(--transition-normal);
  display: flex;
  flex-direction: column;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.05);
  position: relative;
  overflow: hidden;
}

/* 背景特效 5：卡片顶边幻彩流动描边 */
.feature-card::before, .media-card::before, .review-card::before, .article-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent 0%, rgba(56, 189, 248, 0.8) 40%, rgba(168, 85, 247, 0.8) 70%, transparent 100%);
  background-size: 200% 100%;
  opacity: 0.6;
  animation: card-shimmer 6s ease-in-out infinite;
  transition: opacity 0.3s ease;
}

@keyframes card-shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.feature-card:hover, .media-card:hover, .review-card:hover, .article-card:hover {
  border-color: var(--color-border-hover);
  transform: translateY(-5px);
  box-shadow: 0 14px 36px rgba(56, 189, 248, 0.18), inset 0 1px 0 rgba(56, 189, 248, 0.4);
}
.feature-card:hover::before, .media-card:hover::before, .review-card:hover::before, .article-card:hover::before {
  opacity: 1;
  height: 2.5px;
}

.feature-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: rgba(56, 189, 248, 0.1);
  color: var(--color-accent);
  margin-bottom: 20px;
  border: 1px solid rgba(56, 189, 248, 0.2);
  box-shadow: 0 0 16px rgba(56, 189, 248, 0.15);
}
.feature-icon svg {
  width: 32px;
  height: 32px;
}
.feature-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
}
.feature-card p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* 流媒体与 AI 支持图卡 */
.media-section {
  padding: 80px 0;
}
.media-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}
.media-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 34px;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.05);
  transition: var(--transition-normal);
  position: relative;
  overflow: hidden;
}
.media-card h3 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.media-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}
.media-tag {
  background: rgba(14, 23, 42, 0.8);
  border: 1px solid var(--color-border);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.85rem;
  color: var(--color-text-main);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition-normal);
}
.media-tag:hover {
  border-color: var(--color-accent);
  box-shadow: 0 0 12px rgba(56, 189, 248, 0.3);
}

/* 价格对比表 */
.pricing-section {
  padding: 80px 0;
  position: relative;
  background: linear-gradient(180deg, rgba(8, 14, 29, 0.9) 0%, rgba(12, 20, 40, 0.7) 50%, rgba(8, 14, 29, 0.9) 100%);
  border-top: 1px solid var(--color-border-subtle);
  border-bottom: 1px solid var(--color-border-subtle);
}
.pricing-table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  background: var(--color-bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.05);
  -webkit-overflow-scrolling: touch;
}
.pricing-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  min-width: 680px;
}
.pricing-table caption {
  padding: 18px 20px;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text-main);
  background: rgba(14, 23, 42, 0.95);
  border-bottom: 1px solid var(--color-border);
  text-align: left;
}
.pricing-table th, .pricing-table td {
  padding: 20px 22px;
  border-bottom: 1px solid var(--color-border);
}
.pricing-table th {
  background: rgba(10, 16, 30, 0.9);
  color: var(--color-text-muted);
  font-size: 0.9rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.pricing-table tr:last-child td {
  border-bottom: none;
}
.pricing-table tr:hover td {
  background: rgba(56, 189, 248, 0.04);
}
.pricing-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
}
.pricing-price {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--color-accent);
  text-shadow: 0 0 12px rgba(56, 189, 248, 0.3);
}
.pricing-price small {
  font-size: 0.85rem;
  color: var(--color-text-subtle);
  font-weight: 400;
}
.badge-hot {
  background: var(--color-accent-gradient);
  color: #fff;
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: 999px;
  font-weight: 700;
  margin-left: 6px;
  vertical-align: middle;
  box-shadow: 0 0 12px rgba(99, 102, 241, 0.6);
}

/* 用户评价区 */
.reviews-section {
  padding: 80px 0;
}
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.review-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 30px;
  display: flex;
  flex-direction: column;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.05);
  transition: var(--transition-normal);
  position: relative;
  overflow: hidden;
}
.review-stars {
  color: #fbbf24;
  margin-bottom: 14px;
  font-size: 1.05rem;
  text-shadow: 0 0 10px rgba(251, 191, 36, 0.4);
}
.review-text {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: 20px;
  flex: 1;
}
.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
}
.author-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: rgba(14, 23, 42, 0.9);
  border: 1px solid var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--color-accent);
  box-shadow: 0 0 12px rgba(56, 189, 248, 0.35);
}
.author-info h4 {
  font-size: 0.95rem;
  font-weight: 600;
}
.author-info p {
  font-size: 0.8rem;
  color: var(--color-text-subtle);
}

/* FAQ 常见问题 (默认展开) */
.faq-section {
  padding: 80px 0;
  background: linear-gradient(180deg, rgba(8, 14, 29, 0.85) 0%, rgba(15, 23, 42, 0.6) 100%);
  border-top: 1px solid var(--color-border-subtle);
}
.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.faq-item {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition-normal);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
}
.faq-item:hover {
  border-color: var(--color-border-hover);
  box-shadow: 0 6px 20px rgba(56, 189, 248, 0.14);
}
.faq-item summary {
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-text-main);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.faq-item summary::-webkit-details-marker {
  display: none;
}
.faq-item summary::after {
  content: "▾";
  font-size: 1.2rem;
  color: var(--color-accent);
  transition: transform 0.25s ease;
}
.faq-item[open] summary::after {
  transform: rotate(180deg);
}
.faq-content {
  padding: 0 24px 24px;
  color: var(--color-text-muted);
  font-size: 0.96rem;
  line-height: 1.7;
}
.faq-content a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 4px;
}

/* 页脚规范 (仅四个标题，新页面打开) */
.site-footer {
  background: #02050e;
  border-top: 1px solid var(--color-border);
  padding: 50px 0 34px;
  margin-top: auto;
  position: relative;
}
.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 50%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(56, 189, 248, 0.4), transparent);
}
.footer-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  list-style: none;
  margin-bottom: 24px;
  flex-wrap: wrap;
}
.footer-link {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition-normal);
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}
.footer-link:hover {
  color: var(--color-accent);
  text-shadow: 0 0 10px rgba(56, 189, 248, 0.4);
}
.footer-copyright {
  text-align: center;
  color: var(--color-text-subtle);
  font-size: 0.85rem;
  line-height: 1.6;
}

/* 博客/文章通用样式 */
.article-header {
  padding: 60px 0 30px;
  text-align: center;
}
.article-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  color: var(--color-text-subtle);
  font-size: 0.88rem;
  margin-top: 12px;
}
.article-content {
  max-width: 820px;
  margin: 0 auto 60px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 40px;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.05);
}
.article-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 32px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
  color: #fff;
}
.article-content h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin: 24px 0 12px;
  color: var(--color-accent);
}
.article-content p {
  color: var(--color-text-muted);
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 18px;
}
.article-content ul, .article-content ol {
  color: var(--color-text-muted);
  padding-left: 24px;
  margin-bottom: 20px;
  line-height: 1.8;
}
.article-content li {
  margin-bottom: 8px;
}
.article-content a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 4px;
}
.article-cta-box {
  background: rgba(14, 23, 42, 0.85);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-md);
  padding: 26px;
  text-align: center;
  margin: 36px 0;
  box-shadow: 0 0 24px rgba(56, 189, 248, 0.15);
}

/* 知识科普列表页卡片网格 */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 60px;
}
.article-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 26px;
  display: flex;
  flex-direction: column;
  transition: var(--transition-normal);
  text-decoration: none;
  color: inherit;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.05);
  position: relative;
  overflow: hidden;
}
.article-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
  line-height: 1.4;
}
.article-card p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 16px;
  flex: 1;
}
.article-card .read-more {
  color: var(--color-accent);
  font-size: 0.88rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* 面包屑导航 */
.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--color-text-subtle);
  margin-bottom: 20px;
}
.breadcrumbs a {
  color: var(--color-text-muted);
  text-decoration: none;
}
.breadcrumbs a:hover {
  color: var(--color-accent);
}

/* 响应式媒体查询 (@media) */
@media (max-width: 992px) {
  .features-grid, .reviews-grid, .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }
  .features-grid, .reviews-grid, .media-grid, .articles-grid {
    grid-template-columns: 1fr;
  }
  .hero-stats {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .nav-menu {
    gap: 16px;
  }
  .nav-link {
    font-size: 0.88rem;
  }
  .article-content {
    padding: 24px 16px;
  }
  .footer-links {
    gap: 20px;
  }
  .hero-perspective-grid {
    height: 240px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  body::before, body::after, .hero-laser-line::after, .hero-perspective-grid::before {
    animation: none !important;
  }
}