:root {
  /* 配色系统：01 月岩米白 × 烟熏紫灰 × 赤铜 */
  --bg-body: #F2EEE7;           /* 主背景：月岩米白 */
  --bg-alt: #F8F5F0;            /* 辅助背景 */
  --bg-card: #FAF8F5;           /* 卡片暖白底 */
  --bg-stone: #E7E1D8;          /* 浅石灰 */
  
  --secondary-color: #292B30;   /* 主标题 / 重点深色 */
  --accent-purple: #574B61;     /* 烟熏紫灰 */
  --text-main: #292B30;         /* 主正文 */
  --text-muted: #574B61;        /* 次级正文 / 烟熏紫灰 */
  --text-light: #7B707D;        /* 次级辅助文字 */
  
  --primary-color: #B67B60;     /* 主按钮赤铜色 */
  --primary-hover: #9F664D;     /* 按钮悬停深赤铜 */
  --primary-light: #F8F5F0;     /* 浅色辅助区 */
  
  --border-color: #DDD5CB;      /* 边框：温润浅石边框 */
  --border-light: #E7E1D8;      /* 浅边框 */
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  
  --shadow-sm: 0 2px 4px 0 rgba(41, 43, 48, 0.04);
  --shadow-md: 0 8px 18px -2px rgba(87, 75, 97, 0.06), 0 2px 6px -1px rgba(41, 43, 48, 0.03);
  --shadow-lg: 0 16px 32px -4px rgba(87, 75, 97, 0.08), 0 4px 12px -2px rgba(41, 43, 48, 0.03);
  
  --max-width: 1200px;
  --header-height: 74px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  color: var(--text-main);
  background-color: var(--bg-body);
  line-height: 1.68;
  -webkit-font-smoothing: antialiased;
}

/* Accessibility Skip Link */
.skip-link {
  position: absolute;
  top: -60px;
  left: 20px;
  background: var(--primary-color);
  color: #ffffff;
  padding: 10px 18px;
  z-index: 9999;
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-weight: 600;
  transition: top 0.2s ease;
}
.skip-link:focus {
  top: 15px;
}

/* Container */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* Header & Navigation */
header.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(242, 238, 231, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  height: var(--header-height);
  display: flex;
  align-items: center;
}

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

.logo-wrap {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.site-logo {
  height: 44px;
  width: auto;
  max-width: 165px;
  display: block;
  object-fit: contain;
}

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

.site-nav a {
  text-decoration: none;
  color: var(--accent-purple);
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.2s ease;
  padding: 8px 0;
}

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

.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  min-width: 44px;
  padding: 10px 22px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s ease;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--primary-color);
  color: #ffffff;
  box-shadow: 0 3px 10px rgba(182, 123, 96, 0.22);
}

.btn-primary:hover, .btn-primary:focus {
  background: var(--primary-hover);
  color: #ffffff;
  box-shadow: 0 6px 16px rgba(159, 102, 77, 0.32);
}

.btn-outline {
  border-color: var(--border-color);
  color: var(--secondary-color);
  background: var(--bg-card);
}

.btn-outline:hover, .btn-outline:focus {
  border-color: var(--primary-color);
  color: var(--primary-color);
  background: #ffffff;
}

.btn-lg {
  padding: 14px 34px;
  font-size: 1.05rem;
  border-radius: var(--radius-md);
}

/* Sections */
section {
  padding: 76px 0;
  scroll-margin-top: calc(var(--header-height) + 20px);
}

.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 52px;
}

.section-tag {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--primary-color);
  text-transform: uppercase;
  letter-spacing: 1.2px;
  background: var(--bg-stone);
  padding: 5px 14px;
  border-radius: 20px;
  border: 1px solid var(--border-color);
  margin-bottom: 14px;
}

.section-title {
  font-size: 2.15rem;
  font-weight: 800;
  color: var(--secondary-color);
  line-height: 1.32;
  margin-bottom: 14px;
  letter-spacing: -0.3px;
}

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

/* Hero Section: 真实质感极简流线建筑空间背景 */
.hero-section {
  position: relative;
  padding: 96px 0 84px;
  background-color: var(--bg-body);
  background-image: 
    radial-gradient(ellipse at 50% 38%, rgba(255, 253, 249, 0.88) 0%, rgba(248, 245, 240, 0.65) 45%, rgba(242, 238, 231, 0.2) 100%),
    url('images/hero_architecture.webp'),
    url('images/hero_architecture.jpg');
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
  border-bottom: 1px solid var(--border-color);
  text-align: center;
  overflow: hidden;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 6px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 30px;
  font-size: 0.92rem;
  line-height: 1;
  color: var(--accent-purple);
  font-weight: 600;
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
  vertical-align: middle;
}

.hero-badge .badge-car-icon {
  display: inline-block;
  vertical-align: middle;
  flex-shrink: 0;
  margin-top: -1px;
  color: var(--primary-color);
}

.hero-badge .badge-text {
  display: inline-block;
  line-height: 1;
  vertical-align: middle;
}

.hero-title {
  font-size: 2.85rem;
  font-weight: 900;
  color: var(--secondary-color);
  line-height: 1.25;
  letter-spacing: -0.5px;
  max-width: 900px;
  margin: 0 auto 20px;
}

.hero-subtitle {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--primary-color);
  margin-bottom: 18px;
  letter-spacing: 0.2px;
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--accent-purple);
  max-width: 780px;
  margin: 0 auto 38px;
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 44px;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 860px;
  margin: 0 auto;
  padding-top: 32px;
  border-top: 1px solid var(--border-color);
}

.metric-item strong {
  display: block;
  font-size: 1.85rem;
  font-weight: 800;
  color: var(--secondary-color);
}

.metric-item span {
  font-size: 0.88rem;
  color: var(--text-light);
}

/* Feature Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--bg-card);
  padding: 38px 30px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: #C8BEB2;
  box-shadow: var(--shadow-lg);
}

.feature-icon-wrap {
  width: 54px;
  height: 54px;
  border-radius: 12px;
  background: var(--bg-stone);
  color: var(--primary-color);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
}

.feature-icon-wrap svg {
  width: 26px;
  height: 26px;
}

.feature-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--secondary-color);
}

.feature-card p {
  color: var(--text-light);
  font-size: 0.98rem;
  line-height: 1.65;
}

/* Unlock Section (Streaming & AI) */
.unlock-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

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

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

.unlock-icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.unlock-streaming .unlock-icon {
  background: var(--bg-stone);
  color: var(--primary-color);
}

.unlock-ai .unlock-icon {
  background: var(--bg-stone);
  color: var(--accent-purple);
}

.unlock-card h3 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--secondary-color);
}

.unlock-card p {
  color: var(--text-light);
  font-size: 0.98rem;
  margin-bottom: 20px;
  line-height: 1.65;
}

.service-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.service-pill {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  background: var(--bg-body);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--secondary-color);
  transition: border-color 0.2s ease;
}

.service-pill:hover {
  border-color: var(--primary-color);
}

/* Pricing Table */
.pricing-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
}

.pricing-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.95rem;
}

.pricing-table caption {
  font-size: 1.1rem;
  font-weight: 700;
  padding: 18px 20px;
  text-align: left;
  background: var(--bg-stone);
  border-bottom: 1px solid var(--border-color);
  color: var(--secondary-color);
}

.pricing-table th, .pricing-table td {
  padding: 18px 20px;
  border-bottom: 1px solid var(--border-color);
}

.pricing-table th {
  background: var(--bg-alt);
  color: var(--secondary-color);
  font-weight: 700;
  font-size: 1rem;
}

.pricing-table td {
  color: var(--text-muted);
}

.pricing-table tr.popular-row {
  background: #F5EFE8;
}

.plan-badge {
  display: inline-block;
  padding: 3px 9px;
  background: var(--primary-color);
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: 4px;
  margin-left: 8px;
}

.price-num {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--secondary-color);
}

/* Reviews */
.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-md);
  padding: 28px;
  box-shadow: var(--shadow-sm);
}

.review-stars {
  color: var(--primary-color);
  margin-bottom: 12px;
  font-size: 1.1rem;
  letter-spacing: 2px;
}

.review-card p {
  color: var(--secondary-color);
  font-size: 0.95rem;
  line-height: 1.65;
  margin-bottom: 20px;
}

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

.review-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--bg-stone);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--accent-purple);
  font-size: 0.9rem;
}

.review-name {
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--secondary-color);
}

.review-role {
  font-size: 0.82rem;
  color: var(--text-light);
}

/* FAQ */
.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

details.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  box-shadow: var(--shadow-sm);
  transition: border-color 0.2s ease;
}

details.faq-item[open] {
  border-color: #C8BEB2;
}

details.faq-item summary {
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--secondary-color);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  outline: none;
}

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

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

details.faq-item[open] summary::after {
  content: "−";
}

.faq-content {
  margin-top: 14px;
  color: var(--accent-purple);
  font-size: 0.96rem;
  line-height: 1.7;
  border-top: 1px solid var(--border-light);
  padding-top: 12px;
}

.faq-content p {
  margin-bottom: 8px;
}

/* CTA Banner Section: 高端极简烟熏紫灰深色建筑氛围 */
.cta-banner-section {
  background: linear-gradient(135deg, #37333B 0%, #292B30 100%);
  color: #ffffff;
  text-align: center;
  border-radius: var(--radius-lg);
  padding: 64px 32px;
  margin: 40px auto 60px;
  max-width: var(--max-width);
  border: 1px solid #4B4652;
  box-shadow: 0 16px 36px rgba(41, 43, 48, 0.16);
}

.cta-banner-section h2 {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 16px;
  color: #FAF8F5;
  letter-spacing: -0.3px;
}

.cta-banner-section p {
  font-size: 1.1rem;
  color: var(--border-color);
  max-width: 640px;
  margin: 0 auto 34px;
  line-height: 1.7;
}

.btn-white {
  background: var(--primary-color);
  color: #ffffff;
  font-weight: 700;
  box-shadow: 0 4px 16px rgba(182, 123, 96, 0.35);
}

.btn-white:hover, .btn-white:focus {
  background: var(--primary-hover);
  color: #ffffff;
}

/* Footer: 建筑主色深色石炭灰 */
footer.site-footer {
  background: #232428;
  color: #A39BA5;
  padding: 64px 0 32px;
  border-top: 1px solid #36383E;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 24px;
  padding-bottom: 40px;
  border-bottom: 1px solid #36383E;
}

.footer-brand h3 {
  color: #FAF8F5;
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 6px;
}

.footer-brand p {
  font-size: 0.9rem;
  color: #7B707D;
}

.footer-nav {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
}

.footer-nav a {
  color: #DDD5CB;
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.2s ease;
}

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

.footer-bottom {
  text-align: center;
  padding-top: 30px;
  font-size: 0.85rem;
  color: #7B707D;
}

/* Article & Content Page Styles */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--text-light);
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.breadcrumb a {
  color: var(--primary-color);
  text-decoration: none;
}

.breadcrumb a:hover {
  color: var(--primary-hover);
  text-decoration: underline;
}

.content-wrapper {
  max-width: 860px;
  margin: 0 auto;
  background: var(--bg-card);
  padding: 48px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.article-header {
  margin-bottom: 32px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 24px;
}

.article-title {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--secondary-color);
  line-height: 1.32;
  margin-bottom: 16px;
  letter-spacing: -0.3px;
}

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

.article-body {
  font-size: 1.05rem;
  line-height: 1.82;
  color: #383A40;
}

.article-body h2 {
  font-size: 1.55rem;
  font-weight: 700;
  color: var(--secondary-color);
  margin: 36px 0 16px;
  border-left: 4px solid var(--primary-color);
  padding-left: 12px;
}

.article-body h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--secondary-color);
  margin: 24px 0 12px;
}

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

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

.article-body li {
  margin-bottom: 8px;
}

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

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

.article-body blockquote {
  border-left: 4px solid var(--border-color);
  padding: 14px 20px;
  background: var(--bg-alt);
  color: var(--accent-purple);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 24px 0;
}

/* Article List Grid (Knowledge Hub) */
.article-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 26px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.article-card:hover {
  transform: translateY(-3px);
  border-color: #C8BEB2;
  box-shadow: var(--shadow-md);
}

.article-card-tag {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--primary-color);
  background: var(--bg-stone);
  border: 1px solid var(--border-color);
  padding: 3px 9px;
  border-radius: 4px;
  align-self: flex-start;
  margin-bottom: 12px;
}

.article-card h2 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--secondary-color);
  line-height: 1.4;
  margin-bottom: 12px;
}

.article-card p {
  color: var(--text-light);
  font-size: 0.92rem;
  line-height: 1.62;
  margin-bottom: 18px;
}

.article-card-link {
  font-weight: 600;
  color: var(--primary-color);
  text-decoration: none;
  font-size: 0.92rem;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: color 0.2s ease;
}

.article-card-link:hover {
  color: var(--primary-hover);
  text-decoration: underline;
}

/* Responsive Media Queries */
@media (max-width: 1024px) {
  .features-grid, .reviews-grid, .article-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .hero-section {
    padding: 72px 0 60px;
    background-position: center bottom;
    background-image: 
      radial-gradient(circle at 50% 36%, rgba(255, 253, 249, 0.92) 0%, rgba(248, 245, 240, 0.75) 50%, rgba(242, 238, 231, 0.3) 100%),
      url('images/hero_architecture.webp'),
      url('images/hero_architecture.jpg');
  }
  .site-logo {
    height: 38px;
  }
  .hero-title {
    font-size: 2.1rem;
  }
  .hero-metrics {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
  .features-grid, .unlock-grid, .reviews-grid, .article-grid {
    grid-template-columns: 1fr;
  }
  .site-nav {
    display: none;
  }
  .content-wrapper {
    padding: 24px 18px;
  }
  .footer-top {
    flex-direction: column;
    align-items: flex-start;
  }
  .footer-nav {
    flex-direction: column;
    gap: 16px;
  }
}

@media (max-width: 480px) {
  .hero-section {
    padding: 60px 0 48px;
    background-position: center bottom;
  }
  .hero-title {
    font-size: 1.75rem;
  }
  .btn-lg {
    width: 100%;
  }
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  .hero-metrics {
    grid-template-columns: 1fr 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}