/* ===================================================================
   悠兔 YouTu - 【风格 10 · 气泡悠假期】全站原生样式表
   淡紫白 #FBF3FA 底，深紫文字 #5C3A6B，唯一强调色丁香紫 #B97CD8，辅以浅紫 #E8CBF8
   高对比度、清晰易读、极致秒开
   =================================================================== */

:root {
  /* 基础底色与文字层级 (保证极佳可读性与 WCAG AAA 对比度) */
  --bg-dark: #FBF3FA;
  --bg-card: rgba(255, 255, 255, 0.92);
  --bg-card-hover: #FFFFFF;
  --bg-glass: rgba(251, 243, 250, 0.9);
  
  --text-main: #3B1C4B;      /* 深深紫，高对比度主标题 */
  --text-body: #4E2E5F;      /* 正文深紫，清晰易读 */
  --text-muted: #6E4D7F;     /* 辅助说明深紫 */
  --text-sub: #8C6A9E;       /* 次要信息与元数据 */

  /* 品牌强调色系 */
  --accent-cyan: #9C52C2;    /* 丁香紫主色 (原占位变量重定向) */
  --accent-lilac: #B97CD8;   /* 丁香紫明亮色 */
  --accent-deep: #8E3FB8;    /* 高对比度按钮渐变 */
  --accent-light: #E8CBF8;   /* 辅以浅紫 */
  --accent-soft: #F6EBFA;    /* 极浅泡泡紫 */
  --accent-blue: #9C52C2;
  --accent-green: #059669;
  --accent-amber: #d97706;
  
  --gradient-brand: linear-gradient(135deg, #3B1C4B 0%, #7E37A8 50%, #B97CD8 100%);
  --gradient-btn: linear-gradient(135deg, #A858D0 0%, #8E3FB8 100%);
  --gradient-btn-hover: linear-gradient(135deg, #9642C0 0%, #7B2FA2 100%);
  --gradient-border: linear-gradient(135deg, rgba(185, 124, 216, 0.45), rgba(232, 203, 248, 0.3));

  --border-light: rgba(185, 124, 216, 0.24);
  --border-active: rgba(156, 82, 194, 0.6);

  --shadow-glow: 0 0 25px rgba(185, 124, 216, 0.28);
  --shadow-card: 0 10px 30px -10px rgba(142, 63, 184, 0.16);

  --font-stack: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-digits: "Space Grotesk", -apple-system, BlinkMacSystemFont, sans-serif;
  --container-max: 1200px;
}

/* 基础重置与无障碍支持 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-family: var(--font-stack);
  background-color: var(--bg-dark);
  color: var(--text-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* 锚点偏移：解决 sticky 导航栏遮挡标题问题 */
.section[id],
section[id],
[id] {
  scroll-margin-top: 88px;
}

/* 无障碍键盘访问：跳转到主要内容 */
.skip-to-content {
  position: absolute;
  top: -100px;
  left: 20px;
  background: var(--text-main);
  color: #FFFFFF !important;
  padding: 12px 20px;
  border-radius: 8px;
  z-index: 99999;
  font-weight: 700;
  font-size: 0.95rem;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
  transition: top 0.2s ease;
  text-decoration: none;
}

.skip-to-content:focus {
  top: 20px;
  outline: 3px solid var(--accent-lilac);
  outline-offset: 2px;
}

/* 全局键盘交互焦点样式 (:focus-visible) */
a:focus-visible,
button:focus-visible,
summary:focus-visible,
input:focus-visible {
  outline: 2px solid var(--accent-lilac) !important;
  outline-offset: 3px !important;
}

body {
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  background-color: var(--bg-dark);
  color: var(--text-body);
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(185, 124, 216, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 85% 30%, rgba(232, 203, 248, 0.22) 0%, transparent 45%),
    radial-gradient(circle at 50% 80%, rgba(185, 124, 216, 0.08) 0%, transparent 50%);
  background-attachment: fixed;
}

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.2s ease;
}

img, svg {
  vertical-align: middle;
}

/* 容器规范 */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* 渐变标题文本 */
.text-gradient {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

/* 顶部导航 */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: var(--bg-glass);
  border-bottom: 1px solid var(--border-light);
  height: 72px;
  display: flex;
  align-items: center;
}

.navbar .nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.35rem;
  font-weight: 900;
  letter-spacing: -0.5px;
  color: var(--text-main);
}

.brand-logo .logo-icon {
  width: 36px;
  height: 36px;
  background: var(--gradient-btn);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: 0 4px 14px rgba(185, 124, 216, 0.35);
}

.brand-logo .brand-badge {
  font-size: 0.65rem;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 20px;
  background: var(--accent-soft);
  color: var(--accent-deep);
  border: 1px solid var(--accent-light);
  margin-left: 6px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 600;
}

.nav-links a:hover {
  color: var(--accent-deep);
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* 按钮通用组件 (触摸区域至少 44x44px) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  min-height: 44px;
  min-width: 44px;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: 12px;
  cursor: pointer;
  border: none;
  transition: all 0.25s ease;
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-btn);
  color: #ffffff !important;
  box-shadow: 0 6px 20px rgba(185, 124, 216, 0.38);
}

.btn-primary:hover {
  background: var(--gradient-btn-hover);
  box-shadow: 0 8px 26px rgba(185, 124, 216, 0.52);
  transform: translateY(-2px);
}

.btn-secondary {
  background: #FFFFFF;
  color: var(--text-main);
  border: 1px solid var(--border-light);
  box-shadow: 0 2px 8px rgba(185, 124, 216, 0.1);
}

.btn-secondary:hover {
  background: #FFFFFF;
  border-color: var(--accent-deep);
  color: var(--accent-deep);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 14px 32px;
  font-size: 1.05rem;
  border-radius: 14px;
}

.btn-block {
  width: 100%;
}

/* 主视觉区 Hero Section */
.hero-section {
  padding: 70px 0 60px;
  position: relative;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 30px;
  background: var(--accent-soft);
  border: 1px solid rgba(185, 124, 216, 0.35);
  color: var(--text-main);
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 20px;
}

.hero-title {
  font-size: 2.85rem;
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: -0.8px;
  margin-bottom: 18px;
  color: var(--text-main);
}

.hero-intro-lead {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 10px;
  line-height: 1.6;
}

.hero-subtitle {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 30px;
}

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

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  padding-top: 24px;
  border-top: 1px solid var(--border-light);
}

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

.stat-number {
  font-family: var(--font-digits);
  font-size: 1.85rem;
  font-weight: 800;
  color: var(--accent-deep);
  margin-bottom: 4px;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

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

.section-alt {
  background: rgba(246, 235, 250, 0.45);
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
}

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

.section-tag {
  display: inline-block;
  font-size: 0.8rem;
  text-transform: uppercase;
  font-weight: 800;
  letter-spacing: 1.5px;
  color: var(--accent-deep);
  margin-bottom: 10px;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 900;
  margin-bottom: 14px;
  letter-spacing: -0.5px;
  color: var(--text-main);
}

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

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

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: 20px;
  padding: 36px 30px;
  position: relative;
  transition: all 0.3s ease;
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow-card);
}

.feature-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-active);
  transform: translateY(-5px);
  box-shadow: var(--shadow-card), var(--shadow-glow);
}

.feature-icon-box {
  width: 58px;
  height: 58px;
  border-radius: 16px;
  background: var(--accent-soft);
  border: 1px solid rgba(185, 124, 216, 0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-deep);
  margin-bottom: 22px;
}

.feature-title {
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--text-main);
}

.feature-text {
  font-size: 0.95rem;
  color: var(--text-body);
  line-height: 1.65;
}

/* 流媒体与 AI 支持图卡 */
.showcase-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
}

.showcase-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: 20px;
  padding: 38px;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: all 0.3s ease;
}

.showcase-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-btn);
}

.showcase-card:hover {
  border-color: var(--border-active);
  box-shadow: var(--shadow-card), var(--shadow-glow);
  transform: translateY(-4px);
  background: var(--bg-card-hover);
}

.showcase-badge {
  align-self: flex-start;
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.5px;
  background: var(--accent-soft);
  color: var(--accent-deep);
  border: 1px solid rgba(185, 124, 216, 0.35);
  margin-bottom: 16px;
}

.showcase-card h3 {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--text-main);
}

.showcase-card p {
  color: var(--text-body);
  font-size: 0.95rem;
  margin-bottom: 26px;
}

.tags-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: auto;
}

.tag-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  background: #FFFFFF;
  border: 1px solid var(--border-light);
  border-radius: 10px;
  font-size: 0.85rem;
  color: var(--text-main);
  font-weight: 600;
  box-shadow: 0 2px 6px rgba(185, 124, 216, 0.08);
}

.tag-item svg {
  color: var(--accent-deep);
}

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

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: 20px;
  padding: 36px 30px;
  display: flex;
  flex-direction: column;
  position: relative;
  box-shadow: var(--shadow-card);
  transition: all 0.3s ease;
}

.pricing-card.popular {
  background: #FFFFFF;
  border: 2px solid var(--accent-deep);
  box-shadow: 0 16px 42px rgba(185, 124, 216, 0.24);
  transform: scale(1.02);
}

.pricing-ribbon {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-btn);
  color: #FFFFFF;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 4px 16px;
  border-radius: 20px;
  letter-spacing: 0.5px;
  box-shadow: 0 4px 12px rgba(185, 124, 216, 0.35);
}

.pricing-header {
  margin-bottom: 24px;
  text-align: center;
}

.pricing-plan-name {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 6px;
  color: var(--text-main);
}

.pricing-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.pricing-price {
  font-family: var(--font-digits);
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--text-main);
  margin: 18px 0 6px;
}

.pricing-price span {
  font-size: 1rem;
  color: var(--text-muted);
  font-weight: 500;
}

.price-original {
  font-size: 0.95rem;
  color: var(--text-sub);
  text-decoration: line-through;
  margin-left: 8px;
  font-weight: normal;
}

.pricing-features {
  list-style: none;
  margin: 24px 0 32px;
  flex-grow: 1;
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-body);
  margin-bottom: 14px;
}

.pricing-features li svg {
  color: var(--accent-deep);
  flex-shrink: 0;
}

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

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: 20px;
  padding: 30px 26px;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-card);
  transition: all 0.3s ease;
}

.review-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-active);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card), var(--shadow-glow);
}

.review-stars {
  color: var(--accent-amber);
  margin-bottom: 16px;
  display: flex;
  gap: 4px;
}

.review-text {
  font-size: 0.95rem;
  color: var(--text-body);
  line-height: 1.65;
  margin-bottom: 22px;
  flex-grow: 1;
}

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

.user-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, #E8CBF8 0%, #B97CD8 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: #FFFFFF;
}

.user-info h4 {
  font-size: 0.95rem;
  font-weight: 800;
  color: var(--text-main);
}

.user-info p {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* 常见问题 FAQ (纯 HTML details/summary 无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-light);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: all 0.25s ease;
}

.faq-item[open] {
  border-color: var(--border-active);
  background: #FFFFFF;
}

.faq-question {
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  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-question::after {
  content: "+";
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--accent-deep);
  transition: transform 0.25s ease;
  line-height: 1;
}

.faq-item[open] .faq-question::after {
  content: "−";
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 24px 22px;
  font-size: 0.95rem;
  color: var(--text-body);
  line-height: 1.7;
  border-top: 1px solid var(--border-light);
  padding-top: 14px;
}

/* 呼吁行动条 CTA Banner */
.cta-banner {
  margin: 60px 0 20px;
  padding: 56px 40px;
  border-radius: 24px;
  background: linear-gradient(135deg, #F6EBFA 0%, #E8CBF8 100%);
  border: 1px solid rgba(185, 124, 216, 0.4);
  text-align: center;
  box-shadow: var(--shadow-card);
}

.cta-banner h2 {
  font-size: 2.2rem;
  font-weight: 900;
  margin-bottom: 12px;
  color: var(--text-main);
}

.cta-banner p {
  color: var(--text-body);
  font-size: 1.05rem;
  max-width: 600px;
  margin: 0 auto 30px;
}

/* 页脚 Footer */
.footer {
  background: rgba(246, 235, 250, 0.85);
  border-top: 1px solid var(--border-light);
  padding: 50px 0 35px;
  margin-top: 50px;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 28px;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  list-style: none;
  flex-wrap: wrap;
}

.footer-nav a {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 700;
  position: relative;
  padding: 4px 0;
}

.footer-nav a:hover {
  color: var(--accent-deep);
}

.footer-copy {
  color: var(--text-sub);
  font-size: 0.85rem;
  border-top: 1px solid var(--border-light);
  padding-top: 24px;
  width: 100%;
}

/* ===================================================================
   子页面通用排版样式 (关于我们、服务条款、隐私政策、知识科普)
   全部优化为极高对比度白底卡片 + 深紫高清晰文字
   =================================================================== */
.page-container {
  max-width: 920px;
  margin: 50px auto 90px;
  padding: 42px;
  background: #FFFFFF;
  border: 1px solid var(--border-light);
  border-radius: 20px;
  box-shadow: 0 14px 36px rgba(185, 124, 216, 0.15);
}

.page-header {
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 24px;
  margin-bottom: 34px;
}

.page-title {
  font-size: 2.2rem;
  font-weight: 900;
  margin-bottom: 10px;
  color: var(--text-main);
}

.page-meta {
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
}

.page-content section {
  margin-bottom: 34px;
}

.page-content h2 {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 10px;
  border-left: 4px solid var(--accent-deep);
  padding-left: 12px;
}

.page-content p {
  color: var(--text-body);
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 14px;
}

.page-content ul, .page-content ol {
  color: var(--text-body);
  font-size: 1rem;
  line-height: 1.8;
  padding-left: 24px;
  margin-bottom: 16px;
}

.page-content li {
  margin-bottom: 8px;
}

.highlight-box {
  background: var(--accent-soft);
  border: 1px solid rgba(185, 124, 216, 0.4);
  border-radius: 12px;
  padding: 18px 22px;
  margin: 20px 0;
  color: var(--text-main);
  font-size: 0.98rem;
  font-weight: 500;
}

.alert-box {
  background: rgba(239, 68, 68, 0.08);
  border: 1px solid rgba(239, 68, 68, 0.35);
  border-radius: 12px;
  padding: 18px 22px;
  margin: 20px 0;
  color: #991b1b;
  font-size: 0.98rem;
  font-weight: 600;
}

/* 网站地图样式 */
.sitemap-group {
  margin-bottom: 30px;
}

.sitemap-list {
  list-style: none;
  padding-left: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.sitemap-list li a {
  display: block;
  padding: 14px 18px;
  background: #FFFFFF;
  border: 1px solid var(--border-light);
  border-radius: 12px;
  color: var(--text-main);
  font-weight: 600;
  box-shadow: 0 2px 8px rgba(185, 124, 216, 0.08);
}

.sitemap-list li a:hover {
  background: var(--accent-soft);
  color: var(--accent-deep);
  border-color: var(--border-active);
  transform: translateY(-2px);
}

/* ===================================================================
   SEO 文章与知识科普专栏样式 (彻底解决对比度问题，纯白卡片+极深紫字)
   =================================================================== */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-sub);
  margin-bottom: 20px;
}

.breadcrumb a {
  color: var(--text-muted);
  font-weight: 600;
}

.breadcrumb a:hover {
  color: var(--accent-deep);
}

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

.article-header {
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 24px;
  margin-bottom: 30px;
}

.article-meta-info {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-top: 14px;
  flex-wrap: wrap;
}

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

.article-body {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--text-body);
}

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

.article-body h2 {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-main);
  margin: 36px 0 16px;
  border-left: 4px solid var(--accent-deep);
  padding-left: 12px;
}

.article-body h3 {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text-main);
  margin: 26px 0 12px;
}

.article-body ul, .article-body ol {
  margin-bottom: 22px;
  padding-left: 24px;
}

.article-body li {
  margin-bottom: 10px;
  color: var(--text-body);
}

.article-body a {
  color: var(--accent-deep);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.article-body a:hover {
  color: #6a1a94;
}

.article-body blockquote {
  border-left: 4px solid var(--accent-deep);
  background: var(--accent-soft);
  padding: 18px 22px;
  margin: 24px 0;
  border-radius: 0 12px 12px 0;
  color: var(--text-main);
  font-size: 1rem;
  line-height: 1.7;
}

.article-footer-cta {
  margin-top: 45px;
  padding: 36px 30px;
  background: linear-gradient(135deg, #F6EBFA 0%, #E8CBF8 100%);
  border: 1px solid rgba(185, 124, 216, 0.4);
  border-radius: 20px;
  text-align: center;
  box-shadow: 0 10px 24px rgba(185, 124, 216, 0.15);
}

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

.article-footer-cta p {
  color: var(--text-body);
  font-size: 0.98rem;
  margin-bottom: 20px;
}

/* 知识科普专栏文章列表卡片网格 (重构为纯白高亮卡片，字字清晰) */
.articles-catalog-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 26px;
}

.article-catalog-card {
  background: #FFFFFF !important;
  border: 1px solid var(--border-light) !important;
  border-radius: 18px;
  padding: 26px;
  display: flex;
  flex-direction: column;
  box-shadow: 0 8px 24px rgba(185, 124, 216, 0.12) !important;
  transition: all 0.25s ease;
}

.article-catalog-card:hover {
  border-color: var(--border-active) !important;
  transform: translateY(-4px);
  box-shadow: 0 14px 36px rgba(185, 124, 216, 0.22) !important;
}

.article-card-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 4px 12px;
  border-radius: 16px;
  background: var(--accent-soft) !important;
  color: var(--accent-deep) !important;
  border: 1px solid rgba(185, 124, 216, 0.35);
  margin-bottom: 14px;
  align-self: flex-start;
}

.article-card-title {
  font-size: 1.15rem;
  font-weight: 800;
  margin-bottom: 12px;
  line-height: 1.45;
  color: var(--text-main) !important;
}

.article-card-title a {
  color: var(--text-main) !important;
  text-decoration: none;
}

.article-card-title a:hover {
  color: var(--accent-deep) !important;
}

.article-card-desc {
  font-size: 0.92rem;
  color: var(--text-body) !important;
  line-height: 1.65;
  margin-bottom: 18px;
  flex-grow: 1;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-muted) !important;
  border-top: 1px solid var(--border-light) !important;
  padding-top: 14px;
}

.article-card-footer a {
  color: var(--accent-deep) !important;
  font-weight: 700;
}

/* 响应式适配 */
@media (max-width: 992px) {
  .hero-title {
    font-size: 2.75rem;
  }
  
  .features-grid,
  .pricing-grid,
  .reviews-grid {
    grid-template-columns: 1fr;
    gap: 22px;
  }
  
  .pricing-card.popular {
    transform: none;
  }

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

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }
}

@media (max-width: 768px) {
  .navbar {
    height: auto;
    padding: 14px 0;
  }

  .navbar .nav-inner {
    flex-direction: column;
    gap: 14px;
  }

  .nav-links {
    display: none;
  }

  .nav-cta {
    width: 100%;
    justify-content: center;
  }

  .nav-cta .btn {
    width: 100%;
    min-height: 44px;
  }

  .hero-section {
    padding: 45px 0 40px;
  }

  .hero-title {
    font-size: 2.1rem;
    line-height: 1.25;
  }

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

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

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

  .section {
    padding: 55px 0;
  }

  .section-title {
    font-size: 1.8rem;
  }

  .cta-banner {
    padding: 36px 20px;
  }

  .cta-banner h2 {
    font-size: 1.7rem;
  }

  .footer-nav {
    flex-direction: column;
    gap: 18px;
  }

  .page-container {
    padding: 24px 18px;
    margin: 20px 14px 60px;
  }

  .sitemap-list {
    grid-template-columns: 1fr;
  }

  .articles-catalog-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.85rem;
  }

  .stat-number {
    font-size: 1.5rem;
  }

  .showcase-card {
    padding: 24px 18px;
  }

  .pricing-card {
    padding: 28px 20px;
  }
}

/* 遵循系统减少动效偏好 (prefers-reduced-motion) */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  #bg-canvas {
    display: none !important;
  }
}