/* ==========================================================================
   一分机场 (Yifen Airport) - 红金吉祥新春典雅样式表 (贴合喜庆美图氛围)
   ========================================================================== */

/* 1. CSS 变量定义 (红金喜庆浅色调) */
:root {
  --bg-primary: #fffdfa;
  --bg-secondary: #fff7ed; /* 暖金杏衬底 */
  --bg-tertiary: #ffedd5;
  --text-primary: #1c1917; /* 沉稳暖墨色 */
  --text-secondary: #44403c;
  --text-muted: #78716c;
  
  --brand-primary: #dc2626; /* 喜庆中国红 */
  --brand-hover: #b91c1c; /* 典雅深红 */
  --brand-light: #fff1f2; /* 柔粉金衬底 */
  --brand-accent: #d97706; /* 璀璨金黄 */
  --brand-border: #fecdd3; /* 暖粉红边框 */

  --accent-gold: #d97706;
  --accent-gold-bg: #fef3c7;
  --accent-green: #16a34a;
  --accent-green-bg: #f0fdf4;
  --accent-purple: #9333ea;
  --accent-purple-bg: #faf5ff;

  --border-color: #fee2e2;
  --border-dark: #fca5a5;
  --card-bg: #ffffff;
  --card-shadow: 0 4px 20px -2px rgba(220, 38, 38, 0.07), 0 2px 4px -1px rgba(217, 119, 6, 0.04);
  --card-shadow-hover: 0 12px 30px -4px rgba(220, 38, 38, 0.18), 0 4px 8px -2px rgba(217, 119, 6, 0.08);
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  --max-width: 1200px;
}

/* 2. 基础重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

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

a {
  color: var(--brand-primary);
  text-decoration: none;
  transition: all 0.2s ease;
}

a:hover {
  color: var(--brand-hover);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* 3. 布局容器与通用组件 */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 5rem 0;
}

.section-alt {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 3.5rem auto;
}

.section-tag {
  display: inline-block;
  padding: 0.35rem 1rem;
  background-color: var(--brand-light);
  color: var(--brand-primary);
  font-size: 0.875rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  margin-bottom: 1rem;
  border: 1px solid var(--brand-border);
}

.section-title {
  font-size: 2.25rem;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 1rem;
  line-height: 1.25;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
}

/* 4. 按钮规范 (红金渐变喜庆视觉) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.875rem 2rem;
  font-size: 1rem;
  font-weight: 700;
  border-radius: var(--radius-md);
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
  border: 2px solid transparent;
  text-align: center;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, #dc2626 0%, #d97706 100%);
  color: #ffffff !important;
  box-shadow: 0 4px 16px rgba(220, 38, 38, 0.35);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #b91c1c 0%, #b45309 100%);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(220, 38, 38, 0.45);
}

.btn-secondary {
  background-color: var(--card-bg);
  color: #dc2626 !important;
  border-color: #fecdd3;
  box-shadow: 0 2px 6px rgba(220, 38, 38, 0.06);
}

.btn-secondary:hover {
  border-color: #dc2626;
  color: #b91c1c !important;
  background-color: var(--brand-light);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 1rem 2.5rem;
  font-size: 1.125rem;
  border-radius: var(--radius-md);
}

.btn-block {
  width: 100%;
}

/* 5. 顶部导航栏 */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(255, 253, 250, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  height: 72px;
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.35rem;
  font-weight: 900;
  color: var(--text-primary);
}

.logo-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, #dc2626 0%, #d97706 100%);
  color: #fef08a;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 1.3rem;
  box-shadow: 0 2px 8px rgba(220, 38, 38, 0.3);
}

.logo img {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  object-fit: cover;
  box-shadow: 0 2px 8px rgba(220, 38, 38, 0.3);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  font-weight: 600;
}

.nav-links a:hover {
  color: var(--brand-primary);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* 6. Hero 主视觉区 (贴合红金美图背景) */
.hero {
  padding: 5rem 0 4rem 0;
  background: radial-gradient(circle at 50% 0%, #fff1f2 0%, #fff7ed 50%, #fffdfa 100%);
  text-align: center;
  position: relative;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1.25rem;
  background-color: var(--brand-light);
  border: 1px solid var(--brand-border);
  border-radius: var(--radius-full);
  color: var(--brand-primary);
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 1.75rem;
  box-shadow: 0 2px 8px rgba(220, 38, 38, 0.08);
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
}

.hero-title .highlight {
  background: linear-gradient(135deg, #dc2626 0%, #d97706 60%, #b45309 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 750px;
  margin: 0 auto 2.5rem auto;
  line-height: 1.6;
}

.hero-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  margin-bottom: 3rem;
}

.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  max-width: 800px;
  margin: 0 auto;
}

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

.stat-value {
  font-size: 1.75rem;
  font-weight: 900;
  color: var(--brand-primary);
}

.stat-label {
  font-size: 0.875rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* 7. 产品核心优势网格 */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.feature-card {
  background-color: var(--card-bg);
  padding: 2.25rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  box-shadow: var(--card-shadow);
  transition: all 0.3s ease;
}

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

.feature-icon {
  width: 52px;
  height: 52px;
  background-color: var(--brand-light);
  color: var(--brand-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
  border: 1px solid var(--brand-border);
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.feature-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* 8. 流媒体与 AI 解锁区 */
.unlock-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.unlock-box {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--card-shadow);
}

.unlock-box-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
}

.unlock-tag-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.35rem;
}

.unlock-media .unlock-tag-icon {
  background-color: #fee2e2;
  color: #ef4444;
}

.unlock-ai .unlock-tag-icon {
  background-color: #f3e8ff;
  color: #9333ea;
}

.unlock-box-title {
  font-size: 1.35rem;
  font-weight: 800;
}

.platform-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.platform-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.1rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  transition: all 0.2s ease;
}

.platform-chip:hover {
  background-color: var(--brand-light);
  border-color: var(--brand-border);
  color: var(--brand-primary);
}

/* 9. 套餐价格对比表 */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  align-items: stretch;
}

.pricing-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  box-shadow: var(--card-shadow);
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.3s ease;
}

.pricing-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--card-shadow-hover);
}

.pricing-card.featured {
  border: 2px solid var(--brand-primary);
  box-shadow: 0 10px 30px rgba(220, 38, 38, 0.15);
}

.badge-featured {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #dc2626, #d97706);
  color: #ffffff;
  font-size: 0.8rem;
  font-weight: 800;
  padding: 0.3rem 1.1rem;
  border-radius: var(--radius-full);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  box-shadow: 0 4px 10px rgba(220, 38, 38, 0.3);
}

.pricing-header {
  text-align: center;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 1.5rem;
}

.pricing-name {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
}

.pricing-price {
  font-size: 2.75rem;
  font-weight: 900;
  color: var(--brand-primary);
  line-height: 1;
  margin-bottom: 0.5rem;
}

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

.pricing-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.pricing-features {
  list-style: none;
  margin-bottom: 2rem;
  flex-grow: 1;
}

.pricing-features li {
  padding: 0.6rem 0;
  color: var(--text-secondary);
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.pricing-features li::before {
  content: "✓";
  color: var(--accent-green);
  font-weight: 900;
}

/* 10. 用户评价 */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.review-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--card-shadow);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.review-stars {
  color: #f59e0b;
  font-size: 1.1rem;
  margin-bottom: 1rem;
}

.review-text {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: 1.5rem;
  font-style: italic;
}

.review-user {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.avatar {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: var(--brand-light);
  color: var(--brand-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  border: 1px solid var(--brand-border);
}

.user-name {
  font-weight: 700;
  font-size: 0.95rem;
}

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

/* 11. FAQ 常见问题 */
.faq-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.75rem;
}

.faq-item {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  box-shadow: var(--card-shadow);
}

.faq-question {
  font-size: 1.1rem;
  font-weight: 800;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
}

.faq-question::before {
  content: "Q.";
  color: var(--brand-primary);
  font-weight: 900;
}

.faq-answer {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* 12. 页脚 - 严格保留 4 个标题分类 */
.footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 4rem 0 2.5rem 0;
  margin-top: auto;
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2.5rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--border-color);
}

.footer-col {
  text-align: center;
}

.footer-title-link {
  display: inline-block;
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text-primary);
  padding: 0.75rem 1.25rem;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: 0 2px 4px rgba(0,0,0,0.02);
  transition: all 0.25s ease;
  width: 100%;
}

.footer-title-link:hover {
  color: var(--brand-primary);
  border-color: var(--brand-primary);
  background-color: var(--brand-light);
  transform: translateY(-2px);
  box-shadow: var(--card-shadow-hover);
}

.footer-bottom {
  padding-top: 2rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* 13. 子页面专用样式 (About, Terms, Privacy, Sitemap) */
.subpage-hero {
  padding: 4rem 0 3rem 0;
  background: radial-gradient(circle at 50% 0%, #fff1f2 0%, #fff7ed 100%);
  border-bottom: 1px solid var(--border-color);
  text-align: center;
}

.subpage-content {
  padding: 4rem 0;
}

.content-box {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 3rem;
  box-shadow: var(--card-shadow);
  max-width: 900px;
  margin: 0 auto;
}

.content-box h2 {
  font-size: 1.5rem;
  font-weight: 800;
  margin: 2rem 0 1rem 0;
  color: var(--text-primary);
  border-left: 4px solid var(--brand-primary);
  padding-left: 0.75rem;
}

.content-box h2:first-child {
  margin-top: 0;
}

.content-box p {
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  line-height: 1.7;
}

.content-box ul {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
  color: var(--text-secondary);
}

.content-box li {
  margin-bottom: 0.5rem;
  line-height: 1.6;
}

/* 14. 响应式媒体查询 (@media - 手机端单栏优化) */
@media (max-width: 992px) {
  .hero-title {
    font-size: 2.75rem;
  }
  .features-grid,
  .pricing-grid,
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-nav {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }
}

@media (max-width: 768px) {
  .header {
    height: 64px;
  }
  .nav-links {
    display: none;
  }
  .hero {
    padding: 3.5rem 0 2.5rem 0;
  }
  .hero-title {
    font-size: 2.1rem;
  }
  .hero-subtitle {
    font-size: 1rem;
  }
  .hero-cta {
    flex-direction: column;
    width: 100%;
    gap: 0.875rem;
  }
  .hero-cta .btn {
    width: 100%;
  }
  .hero-stats {
    flex-direction: column;
    gap: 1.25rem;
  }
  
  .features-grid,
  .unlock-grid,
  .pricing-grid,
  .reviews-grid,
  .faq-grid {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }

  .footer-nav {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .content-box {
    padding: 1.75rem;
  }

  .section-title {
    font-size: 1.75rem;
  }

  .btn {
    padding: 0.95rem 1.5rem;
    font-size: 1rem;
  }
}