/* ==========================================================================
   灯塔机场 (idengtajiasu.autos) - 全局原生 CSS 样式表
   视觉风格：深海航标与金色灯塔微光 (Deep Oceanic Navy, Beacon Amber & Cyan Ray)
   纯原生 CSS、零重型框架、秒开级性能、无障碍友好、全端自适应响应
   ========================================================================== */

:root {
  /* 品牌核心色彩体系：深海暗夜、灯塔暖金与碧海苍穹 */
  --bg-primary: #0a0f1d;
  --bg-secondary: #0f172a;
  --bg-tertiary: #162035;
  --bg-card: rgba(18, 28, 48, 0.75);
  --bg-card-hover: rgba(26, 38, 64, 0.9);
  --bg-glass: rgba(15, 23, 42, 0.88);
  --bg-accent-soft: rgba(245, 158, 11, 0.08);

  /* 边框与微光反射系统 */
  --border-color: rgba(245, 158, 11, 0.22);
  --border-hover: rgba(251, 191, 36, 0.55);
  --border-accent: rgba(245, 158, 11, 0.7);
  --border-highlight: rgba(255, 255, 255, 0.12);
  --border-subtle: rgba(255, 255, 255, 0.06);

  /* 文字对比度规范 (正文 >= 4.5:1，核心标题 >= 7:1) */
  --text-main: #f8fafc;
  --text-light: #e2e8f0;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  /* 品牌核心色彩：金色灯塔 (Amber) 与 苍穹天蓝 (Cyan) */
  --color-primary: #f59e0b;
  --color-primary-rgb: 245, 158, 11;
  --color-primary-dark: #d97706;
  --color-accent: #38bdf8;
  --color-accent-rgb: 56, 189, 248;
  --color-secondary: #6366f1;
  --color-mint: #10b981;
  --color-success: #10b981;
  --color-tag-bg: rgba(245, 158, 11, 0.12);

  /* 专属流光渐变体系 */
  --color-gradient: linear-gradient(135deg, #f59e0b 0%, #38bdf8 50%, #6366f1 100%);
  --color-gradient-gold: linear-gradient(135deg, #fbbf24 0%, #f59e0b 50%, #d97706 100%);
  --color-gradient-hover: linear-gradient(135deg, #fde68a 0%, #fbbf24 50%, #38bdf8 100%);
  --color-btn-glow: linear-gradient(135deg, rgba(245, 158, 11, 0.45) 0%, rgba(56, 189, 248, 0.3) 100%);
  --color-card-border: linear-gradient(135deg, rgba(245, 158, 11, 0.35) 0%, rgba(56, 189, 248, 0.25) 100%);

  /* 光影与景深系统 */
  --shadow-sm: 0 4px 16px rgba(0, 0, 0, 0.35);
  --shadow-md: 0 10px 30px -5px rgba(0, 0, 0, 0.6), 0 0 1px 1px rgba(255, 255, 255, 0.05);
  --shadow-lg: 0 20px 45px -10px rgba(0, 0, 0, 0.75), 0 0 28px rgba(245, 158, 11, 0.16);
  --shadow-glow: 0 0 30px rgba(245, 158, 11, 0.28);
  --shadow-glow-strong: 0 0 48px rgba(245, 158, 11, 0.45);

  /* 几何圆角与度量体系 */
  --radius-xs: 6px;
  --radius-sm: 10px;
  --radius-md: 18px;
  --radius-lg: 26px;
  --radius-full: 9999px;

  /* 页面容器最大宽度 */
  --container-max-width: 1240px;
  --container-reading-width: 860px;
  --header-height: 74px;
}

/* 基础重置与无障碍通用规范 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-light);
  line-height: 1.65;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  position: relative;
  background-image: 
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(245, 158, 11, 0.15), transparent),
    radial-gradient(ellipse 60% 40% at 85% 60%, rgba(56, 189, 248, 0.08), transparent),
    radial-gradient(ellipse 50% 30% at 15% 40%, rgba(99, 102, 241, 0.08), transparent);
  background-attachment: fixed;
}

/* 键盘直达主内容 Skip Link */
.skip-link {
  position: absolute;
  top: -60px;
  left: 20px;
  background: var(--color-primary);
  color: #000;
  font-weight: 700;
  padding: 12px 24px;
  z-index: 9999;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: top 0.2s ease;
}
.skip-link:focus {
  top: 15px;
}

/* 页面通用容器与板块布局 */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

.reading-container {
  max-width: var(--container-reading-width);
  margin-left: auto;
  margin-right: auto;
}

section {
  padding: 85px 0;
  position: relative;
  scroll-margin-top: calc(var(--header-height) + 16px);
}

/* 顶部固定页眉与导航系统 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-height);
  background-color: var(--bg-glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.logo-group {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-main);
  font-size: 1.28rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.logo-badge {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--color-gradient-gold);
  color: #111827;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 1.25rem;
  box-shadow: 0 4px 14px rgba(245, 158, 11, 0.45);
}

.brand-title {
  color: var(--text-main);
  font-weight: 800;
  font-size: 1.25rem;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.site-nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.98rem;
  font-weight: 500;
  transition: color 0.2s ease;
  position: relative;
  padding: 8px 0;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--color-primary);
}

.site-nav a.active {
  color: var(--color-primary);
  font-weight: 600;
}

.site-nav a.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--color-primary);
  border-radius: 2px;
}

/* 按钮通用体系 (全部保证 >= 44x44px 点击区域) */
.btn-primary,
.header-cta,
.btn-secondary,
.btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 24px;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.98rem;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  white-space: nowrap;
}

.header-cta {
  background: var(--color-gradient-gold);
  color: #111827;
  box-shadow: 0 4px 15px rgba(245, 158, 11, 0.35);
  font-weight: 700;
  padding: 8px 22px;
}

.header-cta:hover,
.header-cta:focus-visible {
  box-shadow: 0 6px 20px rgba(245, 158, 11, 0.55);
  transform: translateY(-1px);
  color: #000;
}

.btn-primary {
  background: var(--color-gradient-gold);
  color: #111827;
  font-weight: 700;
  box-shadow: 0 6px 22px rgba(245, 158, 11, 0.4);
  padding: 14px 34px;
  font-size: 1.05rem;
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--color-gradient-hover);
  color: #000;
  box-shadow: 0 10px 32px rgba(245, 158, 11, 0.6);
  transform: translateY(-2px);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.07);
  color: var(--text-main);
  border: 1px solid var(--border-highlight);
  padding: 14px 30px;
  font-size: 1.02rem;
}

.btn-secondary:hover,
.btn-secondary:focus-visible {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.25);
  transform: translateY(-2px);
}

/* 视觉流光渐变文本 */
.gradient-text {
  background: var(--color-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

/* 主视觉区 Hero Section */
.hero-section {
  padding: 95px 0 75px;
  text-align: center;
  position: relative;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  border-radius: var(--radius-full);
  background: var(--color-tag-bg);
  border: 1px solid var(--border-color);
  color: var(--color-primary);
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 26px;
}

.hero-headline {
  font-size: 3.25rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.03em;
  margin-bottom: 22px;
  color: var(--text-main);
}

.hero-subhead {
  font-size: 1.25rem;
  color: var(--text-light);
  max-width: 820px;
  margin: 0 auto 18px;
  line-height: 1.6;
}

.hero-intro {
  font-size: 1.02rem;
  color: var(--text-muted);
  max-width: 760px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
  margin-bottom: 45px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 960px;
  margin: 0 auto;
  padding-top: 35px;
  border-top: 1px solid var(--border-subtle);
}

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

.stat-num {
  display: block;
  font-size: 2.1rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.2;
  margin-bottom: 4px;
}

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

/* 通用区块标题与说明 */
.section-header {
  text-align: center;
  margin-bottom: 55px;
}

.section-tag {
  display: inline-block;
  font-size: 0.84rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.35rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-main);
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 680px;
  margin: 0 auto;
  line-height: 1.65;
}

/* 核心优势板块 (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-subtle);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  position: relative;
  overflow: hidden;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.3s ease, box-shadow 0.3s ease;
  display: flex;
  flex-direction: column;
}

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

.feature-icon-wrap {
  width: 58px;
  height: 58px;
  border-radius: var(--radius-md);
  background: rgba(245, 158, 11, 0.12);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  margin-bottom: 24px;
}

.feature-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 14px;
}

.feature-desc {
  font-size: 0.96rem;
  color: var(--text-muted);
  line-height: 1.7;
  flex-grow: 1;
}

.feature-list {
  list-style: none;
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--border-subtle);
}

.feature-list li {
  font-size: 0.9rem;
  color: var(--text-light);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.feature-list li::before {
  content: "✓";
  color: var(--color-primary);
  font-weight: 800;
}

/* 流媒体与 AI 支持图卡板块 */
.showcase-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.showcase-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 38px 34px;
  position: relative;
  transition: transform 0.3s ease, border-color 0.3s ease;
}

.showcase-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-color);
  box-shadow: var(--shadow-lg);
}

.showcase-head {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.showcase-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
}

.showcase-title {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--text-main);
}

.showcase-desc {
  font-size: 0.98rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 24px;
}

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

.service-tag {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  padding: 6px 16px;
  font-size: 0.88rem;
  color: var(--text-light);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.service-tag.active {
  border-color: var(--border-color);
  background: var(--color-tag-bg);
  color: var(--color-primary);
  font-weight: 600;
}

/* 套餐价格对比表板块 */
.pricing-section {
  position: relative;
}

.pricing-table-wrap {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  margin-bottom: 28px;
}

.pricing-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  min-width: 640px;
}

.pricing-table caption {
  caption-side: top;
  text-align: left;
  padding: 20px 24px;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  border-bottom: 1px solid var(--border-subtle);
}

.pricing-table th,
.pricing-table td {
  padding: 18px 24px;
  border-bottom: 1px solid var(--border-subtle);
  font-size: 0.96rem;
}

.pricing-table th {
  background: rgba(255, 255, 255, 0.02);
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

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

.pricing-table tr:hover td {
  background: rgba(255, 255, 255, 0.03);
}

.plan-name {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text-main);
  display: block;
}

.plan-badge {
  display: inline-block;
  background: var(--color-tag-bg);
  color: var(--color-primary);
  border: 1px solid var(--border-color);
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  margin-left: 6px;
  font-weight: 600;
  vertical-align: middle;
}

.plan-price {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-primary);
}

.plan-price span {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
}

.pricing-cards-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
  margin-top: 30px;
}

.price-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 30px 24px;
  position: relative;
  display: flex;
  flex-direction: column;
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.price-card.featured {
  border-color: var(--border-accent);
  background: rgba(24, 34, 56, 0.88);
  box-shadow: var(--shadow-lg);
  transform: scale(1.02);
}

.price-card.featured:hover {
  transform: scale(1.04) translateY(-4px);
}

.popular-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-gradient-gold);
  color: #111827;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  letter-spacing: 0.04em;
  box-shadow: 0 4px 10px rgba(245, 158, 11, 0.35);
}

.card-plan-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
}

.card-plan-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 20px;
  min-height: 40px;
}

.card-price-wrap {
  margin-bottom: 24px;
}

.card-price-num {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--text-main);
}

.card-price-unit {
  font-size: 0.9rem;
  color: var(--text-muted);
}

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

.card-plan-features li {
  font-size: 0.92rem;
  color: var(--text-light);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.card-plan-features li::before {
  content: "✔";
  color: var(--color-primary);
  font-size: 0.85rem;
  font-weight: 700;
}

.btn-card-buy {
  width: 100%;
  min-height: 44px;
  padding: 11px 0;
  border-radius: var(--radius-full);
  text-align: center;
  font-weight: 700;
  text-decoration: none;
  font-size: 0.96rem;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.price-card .btn-card-buy {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-main);
  border: 1px solid var(--border-highlight);
}

.price-card .btn-card-buy:hover {
  background: var(--color-primary);
  color: #111827;
  border-color: var(--color-primary);
}

.price-card.featured .btn-card-buy {
  background: var(--color-gradient-gold);
  color: #111827;
  border: none;
  box-shadow: 0 4px 15px rgba(245, 158, 11, 0.4);
}

.price-card.featured .btn-card-buy:hover {
  background: var(--color-gradient-hover);
  box-shadow: 0 6px 22px rgba(245, 158, 11, 0.6);
  color: #000;
}

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

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 30px 26px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.25s ease, border-color 0.25s ease;
}

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

.stars {
  color: #fbbf24;
  font-size: 1.1rem;
  margin-bottom: 14px;
  letter-spacing: 2px;
}

.review-text {
  font-size: 0.95rem;
  color: var(--text-light);
  line-height: 1.68;
  margin-bottom: 22px;
  font-style: italic;
}

.reviewer-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--border-subtle);
}

.reviewer-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--color-primary);
  font-size: 1rem;
}

.reviewer-name {
  font-weight: 600;
  font-size: 0.94rem;
  color: var(--text-main);
  display: block;
}

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

/* FAQ 常见问题解答规范板块 (原生 details/summary，默认全部 open 展开) */
.faq-list {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

details.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0;
  overflow: hidden;
  transition: border-color 0.25s ease, background-color 0.25s ease;
}

details.faq-item[open] {
  border-color: var(--border-color);
  background: rgba(22, 33, 56, 0.7);
}

summary.faq-question {
  padding: 20px 26px;
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--text-main);
  cursor: pointer;
  list-style: none;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

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

summary.faq-question::after {
  content: "+";
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--color-primary);
  transition: transform 0.2s ease;
  line-height: 1;
}

details[open] summary.faq-question::after {
  content: "−";
  transform: rotate(0deg);
}

.faq-answer {
  padding: 0 26px 22px;
  font-size: 0.96rem;
  color: var(--text-light);
  line-height: 1.75;
  border-top: 1px solid var(--border-subtle);
  padding-top: 16px;
}

.faq-answer a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.faq-answer a:hover {
  color: var(--color-accent);
}

/* 文章详情页与科普专栏排版体系 */
.article-header {
  padding: 60px 0 35px;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 40px;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  color: var(--text-dim);
  font-size: 0.9rem;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

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

.article-headline {
  font-size: 2.35rem;
  font-weight: 800;
  line-height: 1.3;
  color: var(--text-main);
  margin-bottom: 20px;
}

.article-lead {
  font-size: 1.12rem;
  color: var(--text-light);
  line-height: 1.7;
  padding: 18px 22px;
  background: rgba(245, 158, 11, 0.06);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-xs);
  margin-bottom: 30px;
}

.article-body {
  font-size: 1.04rem;
  line-height: 1.85;
  color: var(--text-light);
}

.article-body h2 {
  font-size: 1.65rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 42px 0 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-subtle);
  scroll-margin-top: calc(var(--header-height) + 20px);
}

.article-body h3 {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--text-main);
  margin: 28px 0 14px;
}

.article-body p {
  margin-bottom: 22px;
}

.article-body ul,
.article-body ol {
  margin: 0 0 24px 28px;
}

.article-body li {
  margin-bottom: 10px;
}

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

.article-body a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
  font-weight: 500;
}

.article-body a:hover {
  color: var(--color-accent);
}

.article-body blockquote {
  background: var(--bg-card);
  border-left: 4px solid var(--color-accent);
  padding: 18px 24px;
  margin: 26px 0;
  border-radius: var(--radius-xs);
  font-style: italic;
  color: var(--text-muted);
}

.article-cta-box {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.12) 0%, rgba(56, 189, 248, 0.08) 100%);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  margin: 48px 0;
  text-align: center;
}

.article-cta-box h3 {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 12px;
}

.article-cta-box p {
  color: var(--text-muted);
  font-size: 0.98rem;
  margin-bottom: 24px;
}

/* 知识科普文章卡片网格列表 */
.knowledge-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 30px 26px;
  display: flex;
  flex-direction: column;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.article-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-color);
  box-shadow: var(--shadow-lg);
  background: var(--bg-card-hover);
}

.article-card-tag {
  align-self: flex-start;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--color-primary);
  background: var(--color-tag-bg);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  margin-bottom: 16px;
  border: 1px solid var(--border-color);
}

.article-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--text-main);
  margin-bottom: 14px;
  flex-grow: 0;
}

.article-card-title a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease;
}

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

.article-card-excerpt {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.68;
  margin-bottom: 22px;
  flex-grow: 1;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.86rem;
  color: var(--text-dim);
}

.article-card-link {
  color: var(--color-primary);
  font-weight: 600;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.article-card-link:hover {
  color: var(--color-accent);
}

/* 面包屑导航 */
.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-dim);
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.breadcrumbs a {
  color: var(--text-muted);
  text-decoration: none;
}

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

.breadcrumbs span.current {
  color: var(--color-primary);
  font-weight: 500;
}

/* 网站地图与条款页面专用排版 */
.info-section {
  padding: 60px 0 80px;
}

.sitemap-group {
  margin-bottom: 38px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 30px;
}

.sitemap-group h2 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-subtle);
}

.sitemap-links-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.sitemap-links-grid a {
  color: var(--text-light);
  text-decoration: none;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-subtle);
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sitemap-links-grid a:hover {
  background: rgba(245, 158, 11, 0.08);
  border-color: var(--border-color);
  color: var(--color-primary);
  transform: translateX(4px);
}

/* 页脚系统 (仅保留4个核心标题链接：网站地图、关于我们、服务条款、隐私政策) */
.site-footer {
  margin-top: auto;
  background: #060a12;
  border-top: 1px solid var(--border-subtle);
  padding: 50px 0 40px;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 30px;
}

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

.footer-nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.98rem;
  font-weight: 600;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  transition: color 0.2s ease, background 0.2s ease;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

.footer-nav a:hover,
.footer-nav a:focus-visible {
  color: var(--color-primary);
  background: rgba(245, 158, 11, 0.08);
}

.footer-copy {
  font-size: 0.88rem;
  color: var(--text-dim);
  text-align: center;
  line-height: 1.6;
}

/* ==========================================================================
   响应式断点适配规范 (@media)
   ========================================================================== */

/* 1024px 平板与小屏桌面 */
@media (max-width: 1024px) {
  .hero-headline {
    font-size: 2.65rem;
  }
  .features-grid,
  .knowledge-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-cards-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .price-card.featured {
    transform: none;
  }
  .price-card.featured:hover {
    transform: translateY(-4px);
  }
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* 768px 平板与大屏手机 */
@media (max-width: 768px) {
  :root {
    --header-height: 66px;
  }
  section {
    padding: 60px 0;
  }
  .hero-headline {
    font-size: 2.15rem;
  }
  .hero-subhead {
    font-size: 1.08rem;
  }
  .section-title {
    font-size: 1.85rem;
  }
  .site-nav {
    display: none; /* 移动端精简突出 CTA */
  }
  .features-grid,
  .showcase-grid,
  .knowledge-grid,
  .reviews-grid,
  .sitemap-links-grid {
    grid-template-columns: 1fr;
  }
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }
  .pricing-cards-grid {
    grid-template-columns: 1fr;
  }
  .footer-nav {
    gap: 16px;
  }
}

/* 480px / 390px / 360px 手机端完美单栏与手指触摸保障 */
@media (max-width: 480px) {
  .container {
    padding-left: 18px;
    padding-right: 18px;
  }
  .hero-headline {
    font-size: 1.85rem;
  }
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  .btn-primary,
  .btn-secondary {
    width: 100%;
  }
  .hero-stats {
    grid-template-columns: 1fr;
  }
  .footer-nav {
    flex-direction: column;
    gap: 8px;
    width: 100%;
  }
  .footer-nav a {
    width: 100%;
    justify-content: center;
  }
}

/* 减弱动画无障碍偏好 */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}