/* ===================================================================
   闪电机场 (Shandian Airport) - 原生极简高响应样式表
   全站零外部依赖，极速秒开，全响应式适配
   =================================================================== */

:root {
  --bg-primary: #0a0d14;
  --bg-secondary: #111726;
  --bg-card: rgba(22, 29, 47, 0.75);
  --bg-card-hover: rgba(30, 41, 66, 0.9);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(0, 229, 255, 0.4);
  
  --primary: #00e5ff;
  --primary-hover: #33ebff;
  --primary-glow: rgba(0, 229, 255, 0.35);
  
  --accent-gold: #f59e0b;
  --accent-purple: #8b5cf6;
  --accent-green: #10b981;
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-glow: 0 0 25px var(--primary-glow);
}

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

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(0, 229, 255, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 85% 30%, rgba(139, 92, 246, 0.07) 0%, transparent 45%),
    radial-gradient(circle at 50% 85%, rgba(0, 229, 255, 0.05) 0%, transparent 50%);
  background-attachment: fixed;
}

a {
  color: inherit;
  text-decoration: none;
}

img, svg {
  vertical-align: middle;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 顶部导航 */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 13, 20, 0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  padding: 16px 0;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: #fff;
}

.logo-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, #00e5ff, #8b5cf6);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #0a0d14;
  box-shadow: 0 0 15px rgba(0, 229, 255, 0.4);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-link {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition);
}

.nav-link:hover {
  color: var(--primary);
}

.nav-link.nav-highlight {
  color: var(--primary);
  font-weight: 700;
  position: relative;
}

.nav-link.nav-highlight::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--primary);
  border-radius: var(--radius-full);
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 11px 22px;
  border-radius: var(--radius-full);
  transition: var(--transition);
  cursor: pointer;
  border: 1px solid transparent;
  text-align: center;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, #00e5ff 0%, #0099ff 100%);
  color: #060911;
  box-shadow: 0 4px 18px rgba(0, 229, 255, 0.35);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #33ebff 0%, #1aa3ff 100%);
  box-shadow: 0 6px 24px rgba(0, 229, 255, 0.55);
  transform: translateY(-2px);
}

.btn-outline {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-main);
  border: 1px solid var(--border-color);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.09);
  border-color: rgba(255, 255, 255, 0.2);
  color: #fff;
  transform: translateY(-2px);
}

.btn-lg {
  padding: 14px 34px;
  font-size: 1.05rem;
}

/* 主视觉区 Hero */
.hero-section {
  padding: 85px 0 60px;
  text-align: center;
  position: relative;
}

.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: rgba(0, 229, 255, 0.1);
  border: 1px solid rgba(0, 229, 255, 0.25);
  color: var(--primary);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(2.3rem, 5.5vw, 4rem);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -1px;
  margin-bottom: 22px;
  color: #fff;
}

.gradient-text {
  background: linear-gradient(135deg, #ffffff 30%, #00e5ff 70%, #9966ff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  max-width: 720px;
  margin: 0 auto 36px;
  font-size: 1.15rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 50px;
}

/* 核心保障指标横幅 */
.trust-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px 30px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(10px);
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 14px;
  text-align: left;
}

.trust-icon {
  width: 44px;
  height: 44px;
  background: rgba(0, 229, 255, 0.1);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  flex-shrink: 0;
}

.trust-num {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  line-height: 1.2;
}

.trust-label {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* 统一区块通用样式 */
.section {
  padding: 85px 0;
  position: relative;
}

.section-alt {
  background: rgba(17, 23, 38, 0.45);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 55px;
}

.section-tag {
  color: var(--primary);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 10px;
  display: block;
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 750;
  color: #fff;
  margin-bottom: 14px;
  letter-spacing: -0.5px;
}

.section-desc {
  font-size: 1rem;
  color: var(--text-muted);
}

/* 核心优势网格 */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--primary), transparent);
  opacity: 0;
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-5px);
  border-color: rgba(0, 229, 255, 0.3);
  box-shadow: 0 12px 35px rgba(0, 0, 0, 0.45);
  background: var(--bg-card-hover);
}

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

.feature-icon-box {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: rgba(0, 229, 255, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  margin-bottom: 22px;
}

.feature-card h3 {
  font-size: 1.22rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.92rem;
  line-height: 1.65;
}

/* 流媒体与 AI 支持专区 */
.unlock-showcase {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.unlock-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
}

.unlock-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 20px;
}

.unlock-header-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
}

.icon-ai {
  background: linear-gradient(135deg, #10a37f, #0084ff);
}

.icon-media {
  background: linear-gradient(135deg, #e50914, #113ccf);
}

.unlock-header h3 {
  font-size: 1.35rem;
  font-weight: 700;
  color: #fff;
}

.unlock-box p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 26px;
  line-height: 1.65;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  color: #e2e8f0;
}

.tag-item svg {
  width: 14px;
  height: 14px;
  color: var(--primary);
}

/* 价格套餐对比表 */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
  align-items: stretch;
}

.price-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 34px 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition);
}

.price-card:hover {
  transform: translateY(-6px);
  border-color: rgba(0, 229, 255, 0.35);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.45);
}

.price-card.featured {
  background: linear-gradient(180deg, rgba(16, 26, 50, 0.95) 0%, rgba(22, 33, 62, 0.9) 100%);
  border: 2px solid var(--primary);
  box-shadow: 0 0 25px rgba(0, 229, 255, 0.2);
}

.featured-ribbon {
  position: absolute;
  top: -13px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #00e5ff, #0077ff);
  color: #060911;
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 1px;
  padding: 4px 14px;
  border-radius: var(--radius-full);
}

.plan-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 6px;
}

.plan-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.plan-price {
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
}

.price-currency {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--primary);
}

.price-amount {
  font-size: 2.3rem;
  font-weight: 800;
  color: #fff;
}

.price-period {
  font-size: 0.85rem;
  color: var(--text-dim);
}

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

.plan-features li {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.plan-features li svg {
  color: var(--primary);
  flex-shrink: 0;
}

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

/* 用户评价 */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.review-stars {
  color: var(--accent-gold);
  margin-bottom: 14px;
  display: flex;
  gap: 4px;
}

.review-text {
  font-size: 0.95rem;
  color: #cbd5e1;
  line-height: 1.65;
  margin-bottom: 22px;
}

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

.reviewer-avatar {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, #3b82f6, #8b5cf6);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #fff;
  font-size: 0.95rem;
}

.reviewer-info h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: #fff;
}

.reviewer-info span {
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* 常见问题 FAQ (原生 details/summary，无需外部JS) */
.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.faq-item:hover {
  border-color: rgba(255, 255, 255, 0.16);
}

.faq-item[open] {
  border-color: rgba(0, 229, 255, 0.3);
  background: var(--bg-card-hover);
}

.faq-question {
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 600;
  color: #fff;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

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

.faq-chevron {
  width: 20px;
  height: 20px;
  color: var(--primary);
  transition: transform 0.25s ease;
  flex-shrink: 0;
}

.faq-item[open] .faq-chevron {
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 24px 22px;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  margin-top: 4px;
  padding-top: 16px;
}

/* 底部 CTA 诱导区 */
.cta-banner {
  margin-top: 40px;
  padding: 55px 40px;
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.1) 0%, rgba(139, 92, 246, 0.12) 100%);
  border: 1px solid rgba(0, 229, 255, 0.25);
  border-radius: var(--radius-lg);
  text-align: center;
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.4);
}

.cta-banner h2 {
  font-size: 2rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 14px;
}

.cta-banner p {
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 28px;
  font-size: 1rem;
}

/* 页脚 Footer - 严格规范：只保留四个标题 */
.footer {
  background: #07090f;
  border-top: 1px solid var(--border-color);
  padding: 50px 0 35px;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 38px;
  list-style: none;
  margin-bottom: 30px;
}

.footer-nav-link {
  color: #cbd5e1;
  font-size: 1rem;
  font-weight: 600;
  transition: var(--transition);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
}

.footer-nav-link:hover {
  color: var(--primary);
  background: rgba(0, 229, 255, 0.08);
}

.footer-bottom {
  text-align: center;
  color: var(--text-dim);
  font-size: 0.85rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 24px;
}

/* ===================================================================
   响应式媒体查询 (@media) - 确保手机端完美单栏与大触控按键
   =================================================================== */

@media (max-width: 1024px) {
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 18px;
  }
  
  .navbar {
    padding: 10px 0;
  }

  .nav-container {
    flex-wrap: wrap;
    gap: 8px 12px;
  }

  .nav-links {
    display: flex;
    order: 3;
    width: 100%;
    overflow-x: auto;
    white-space: nowrap;
    padding: 6px 2px 2px;
    gap: 16px;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
  }

  .nav-links::-webkit-scrollbar {
    display: none;
  }

  .nav-link {
    font-size: 0.88rem;
    flex-shrink: 0;
  }

  .hero-section {
    padding: 50px 0 40px;
  }

  .hero-title {
    font-size: 2.2rem;
  }

  .hero-desc {
    font-size: 1rem;
    margin-bottom: 28px;
  }

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

  .hero-actions .btn {
    width: 100%;
    min-height: 50px; /* 便于大拇指触摸 */
    font-size: 1.05rem;
  }

  .trust-bar {
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 20px;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .unlock-showcase {
    grid-template-columns: 1fr;
  }

  .pricing-grid {
    grid-template-columns: 1fr;
  }

  .price-card .btn {
    min-height: 48px;
  }

  .reviews-grid {
    grid-template-columns: 1fr;
  }

  .footer-nav {
    flex-direction: column;
    gap: 16px;
  }

  .footer-nav-link {
    font-size: 1.05rem;
    display: block;
    text-align: center;
  }

  .cta-banner {
    padding: 35px 20px;
  }

  .cta-banner h2 {
    font-size: 1.6rem;
  }

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

/* ===================================================================
   独立子页面通用样式 (关于我们、服务条款、隐私政策、网站地图)
   =================================================================== */

.subpage-hero {
  padding: 60px 0 40px;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
  background: radial-gradient(circle at 50% 0%, rgba(0, 229, 255, 0.1) 0%, transparent 60%);
}

.subpage-title {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 800;
  color: #fff;
  margin-bottom: 12px;
}

.subpage-subtitle {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 650px;
  margin: 0 auto;
}

.doc-wrapper {
  max-width: 860px;
  margin: 45px auto 70px;
  padding: 0 20px;
}

.doc-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px;
  margin-bottom: 28px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
}

.doc-section-title {
  font-size: 1.45rem;
  font-weight: 750;
  color: #fff;
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.doc-section-title svg {
  color: var(--primary);
  flex-shrink: 0;
}

.doc-card p {
  color: #cbd5e1;
  font-size: 0.98rem;
  line-height: 1.8;
  margin-bottom: 16px;
}

.doc-card p:last-child {
  margin-bottom: 0;
}

.doc-list {
  list-style: none;
  margin: 16px 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.doc-list li {
  color: #cbd5e1;
  font-size: 0.95rem;
  line-height: 1.65;
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.doc-list li svg {
  color: var(--primary);
  flex-shrink: 0;
  margin-top: 3px;
}

.alert-box {
  background: rgba(245, 158, 11, 0.08);
  border: 1px solid rgba(245, 158, 11, 0.3);
  border-radius: var(--radius-md);
  padding: 18px 22px;
  margin: 20px 0;
  color: #fde68a;
  font-size: 0.95rem;
  line-height: 1.6;
}

.alert-box-success {
  background: rgba(16, 185, 129, 0.08);
  border-color: rgba(16, 185, 129, 0.3);
  color: #a7f3d0;
}

.node-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 20px;
}

.node-item {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-sm);
  padding: 16px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.node-name {
  font-weight: 600;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 10px;
}

.node-tag {
  font-size: 0.75rem;
  padding: 3px 8px;
  border-radius: var(--radius-full);
  background: rgba(0, 229, 255, 0.12);
  color: var(--primary);
  font-weight: 600;
}

.sitemap-group {
  margin-bottom: 30px;
}

.sitemap-group h3 {
  font-size: 1.2rem;
  color: #fff;
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

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

.sitemap-links a {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.95rem;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.02);
  transition: var(--transition);
}

.sitemap-links a:hover {
  background: rgba(0, 229, 255, 0.08);
  color: var(--primary);
  transform: translateX(4px);
}

@media (max-width: 768px) {
  .doc-card {
    padding: 24px 20px;
  }
  .node-grid {
    grid-template-columns: 1fr;
  }
  .sitemap-links {
    grid-template-columns: 1fr;
  }
}

/* ===================================================================
   高科技网格卡片 (Grid Cards) 与 SEO 文章阅读页样式
   =================================================================== */

.articles-section {
  margin-top: 50px;
  padding-top: 40px;
  border-top: 1px solid var(--border-color);
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 32px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 26px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  overflow: hidden;
  transition: var(--transition);
}

.article-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--primary), transparent);
  opacity: 0;
  transition: var(--transition);
}

.article-card:hover {
  transform: translateY(-5px);
  border-color: rgba(0, 229, 255, 0.4);
  background: var(--bg-card-hover);
  box-shadow: 0 12px 35px rgba(0, 229, 255, 0.12);
}

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

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.card-tag {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: var(--primary);
  background: rgba(0, 229, 255, 0.1);
  border: 1px solid rgba(0, 229, 255, 0.25);
  border-radius: var(--radius-full);
  padding: 3px 10px;
}

.card-words {
  font-size: 0.78rem;
  color: var(--text-dim);
}

.card-title {
  font-size: 1.12rem;
  font-weight: 750;
  color: #fff;
  line-height: 1.45;
  margin-bottom: 12px;
  transition: var(--transition);
}

.article-card:hover .card-title {
  color: var(--primary);
}

.card-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 22px;
  flex-grow: 1;
}

.card-footer {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.read-btn {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition);
}

.article-card:hover .read-btn {
  gap: 10px;
  color: #fff;
}

/* 单篇 SEO 文章页样式 */
.article-header {
  padding: 45px 0 25px;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
  background: radial-gradient(circle at 30% 0%, rgba(0, 229, 255, 0.08) 0%, transparent 50%);
}

.article-title-main {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 800;
  color: #fff;
  line-height: 1.3;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.article-meta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  color: var(--text-dim);
  font-size: 0.85rem;
}

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

.article-body {
  font-size: 1rem;
  line-height: 1.9;
  color: #cbd5e1;
}

.article-body h2 {
  font-size: 1.4rem;
  font-weight: 750;
  color: #fff;
  margin: 38px 0 16px;
  padding-left: 14px;
  border-left: 4px solid var(--primary);
}

.article-body h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: #e2e8f0;
  margin: 26px 0 12px;
}

.article-body p {
  margin-bottom: 18px;
  text-align: justify;
}

.article-body ul, .article-body ol {
  margin: 16px 0 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.article-body li {
  line-height: 1.75;
}

.article-body strong {
  color: #fff;
}

.article-body a {
  color: var(--primary);
  text-decoration: underline;
  text-underline-offset: 4px;
  transition: var(--transition);
}

.article-body a:hover {
  color: #fff;
}

.article-bottom-actions {
  margin-top: 45px;
  padding-top: 25px;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

@media (max-width: 1024px) {
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .articles-grid {
    grid-template-columns: 1fr;
  }
  .article-title-main {
    font-size: 1.65rem;
  }
  .article-bottom-actions {
    flex-direction: column;
    width: 100%;
  }
  .article-bottom-actions .btn {
    width: 100%;
  }
}

/* ===================================================================
   高能赛博雷电引擎 Canvas 与画面真实震撼爆闪特效
   =================================================================== */

#lightning-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 0;
}

.navbar,
.hero-section,
.section,
.footer,
.subpage-hero,
.article-header,
.doc-wrapper {
  position: relative;
  z-index: 1;
}

/* 闪电降临瞬间：画面震撼通透爆闪与电荷激活 */
body.thunder-striking .logo-icon {
  box-shadow: 0 0 35px #00e5ff, 0 0 65px rgba(0, 229, 255, 0.9);
  transform: scale(1.06);
  transition: transform 0.08s ease, box-shadow 0.08s ease;
}

body.thunder-striking .gradient-text {
  filter: drop-shadow(0 0 25px rgba(0, 229, 255, 0.95)) drop-shadow(0 0 50px rgba(139, 92, 246, 0.6));
  transition: filter 0.08s ease;
}

body.thunder-striking .price-card.featured {
  border-color: #ffffff;
  box-shadow: 0 0 40px rgba(0, 229, 255, 0.65), 0 0 85px rgba(0, 229, 255, 0.35);
  transition: box-shadow 0.08s ease, border-color 0.08s ease;
}

body.thunder-striking .badge-tag {
  background: rgba(0, 229, 255, 0.25);
  border-color: #00e5ff;
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.6);
  color: #fff;
}