/* ==========================================================================
   【风格 01 · 航线晨昏】Mikasa 机场 - 暮色航站楼风 全局样式表
   深蓝暮色 #0B142E | 唯一强调色晨昏金 #FFB454 | 暖白正文 #F5F7FA
   ========================================================================== */

:root {
  --bg-dusk: #0B142E;
  --bg-darker: #070D1E;
  --bg-card: rgba(16, 26, 56, 0.78);
  --bg-card-hover: rgba(23, 37, 78, 0.9);
  --gold-accent: #FFB454;
  --gold-hover: #FFA230;
  --gold-dim: rgba(255, 180, 84, 0.15);
  --gold-glow: rgba(255, 180, 84, 0.35);
  --border-color: rgba(255, 180, 84, 0.16);
  --border-highlight: rgba(255, 180, 84, 0.45);
  --text-white: #F5F7FA;
  --text-muted: #A6B4D0;
  --text-dim: #6E7F9E;
  --accent-green: #10B981;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-pill: 9999px;
  --max-width: 1240px;
  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

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

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

body {
  font-family: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-dusk);
  color: var(--text-white);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.stat-num, .plan-price, .plan-currency, .stat-item strong, .plan-features strong {
  font-family: "Space Grotesk", "SF Pro Display", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-feature-settings: "tnum";
  font-variant-numeric: tabular-nums;
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 2;
}

/* 顶部导航 */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(11, 20, 46, 0.88);
  border-bottom: 1px solid var(--border-color);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.3rem;
  font-weight: 900;
  letter-spacing: -0.02em;
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, #FFB454 0%, #FF9820 100%);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 16px rgba(255, 180, 84, 0.45);
  color: var(--bg-dusk);
}

.logo-text {
  color: var(--text-white);
  font-weight: 900;
}

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

.nav-menu a {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 600;
  position: relative;
  padding: 6px 0;
}

.nav-menu a:hover {
  color: var(--gold-accent);
}

.nav-knowledge-link {
  color: var(--gold-accent) !important;
  position: relative;
}

.nav-knowledge-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--gold-accent);
  border-radius: 2px;
  box-shadow: 0 0 8px var(--gold-accent);
}

/* 按钮体系 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-pill);
  font-size: 0.95rem;
  font-weight: 800;
  cursor: pointer;
  border: 1px solid transparent;
  transition: var(--transition);
  min-height: 46px;
  text-align: center;
}

.btn-primary {
  background: linear-gradient(135deg, #FFB454 0%, #FF9820 100%);
  color: #0B142E;
  box-shadow: 0 4px 22px rgba(255, 180, 84, 0.4);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #FFC070 0%, #FFA836 100%);
  box-shadow: 0 6px 28px rgba(255, 180, 84, 0.6);
  transform: translateY(-2px);
}

.btn-secondary {
  background: rgba(255, 180, 84, 0.08);
  border-color: rgba(255, 180, 84, 0.28);
  color: var(--gold-accent);
}

.btn-secondary:hover {
  background: rgba(255, 180, 84, 0.16);
  border-color: var(--gold-accent);
  color: #fff;
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1.08rem;
  min-height: 52px;
}

/* 副页面内容布局 */
.subpage-hero {
  padding: 60px 0 40px;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
  background: rgba(16, 26, 56, 0.6);
}

.section-title {
  font-family: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: clamp(1.8rem, 3.2vw, 2.4rem);
  font-weight: 900;
  color: var(--text-white);
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

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

.subpage-content {
  max-width: 880px;
  margin: 50px auto 80px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 48px;
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.5);
}

.subpage-content h2 {
  font-family: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--text-white);
  margin: 36px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.subpage-content h2:first-of-type {
  margin-top: 0;
}

.subpage-content p {
  color: var(--text-muted);
  font-size: 0.98rem;
  line-height: 1.8;
  margin-bottom: 16px;
}

.subpage-content ul {
  list-style: disc;
  margin: 0 0 20px 24px;
  color: var(--text-muted);
}

.subpage-content li {
  margin-bottom: 8px;
  line-height: 1.7;
}

.highlight-box {
  background: rgba(255, 180, 84, 0.08);
  border-left: 4px solid var(--gold-accent);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 20px 0;
  color: var(--text-white);
  font-size: 0.95rem;
}

.warning-box {
  background: rgba(239, 68, 68, 0.08);
  border-left: 4px solid #ef4444;
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 20px 0;
  color: #fca5a5;
  font-size: 0.95rem;
}

.sitemap-links-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 24px;
}

.sitemap-card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
}

.sitemap-card h3 {
  font-size: 1.15rem;
  margin-bottom: 14px;
  color: var(--gold-accent);
  font-weight: 800;
}

.sitemap-card ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.sitemap-card li {
  margin-bottom: 10px;
}

.sitemap-card a {
  color: var(--gold-accent);
  font-size: 0.95rem;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.sitemap-card a:hover {
  text-decoration: underline;
  color: #FFE3A0;
}

/* 页脚 (只保留 4 个标题链接并新窗口打开) */
.footer {
  border-top: 1px solid var(--border-color);
  background: rgba(8, 14, 33, 0.98);
  padding: 40px 0 30px;
  margin-top: auto;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  list-style: none;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.footer-link {
  font-size: 1rem;
  font-weight: 700;
  color: #CBD5E1;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.footer-link:hover {
  color: var(--gold-accent);
  background: rgba(255, 180, 84, 0.08);
}

.footer-copy {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-dim);
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
  }
  .subpage-content {
    padding: 24px 18px;
    margin: 30px auto 50px;
  }
  .sitemap-links-grid {
    grid-template-columns: 1fr;
  }
  .footer-nav {
    flex-direction: column;
    gap: 14px;
  }
}

/* ==========================================================================
   A11y & SEO Enhancements: Skip Link, Focus, Scroll Margin, Reduced Motion
   ========================================================================== */
.skip-link {
  position: absolute;
  top: -9999px;
  left: 20px;
  z-index: 99999;
  padding: 12px 20px;
  background: var(--gold-accent, #FFB454);
  color: #0B142E !important;
  font-weight: 800;
  border-radius: 8px;
  text-decoration: none;
  box-shadow: 0 4px 20px rgba(0,0,0,0.5);
  transition: top 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.skip-link:focus, .skip-link:focus-visible {
  top: 16px;
  outline: 3px solid #FFFFFF;
  outline-offset: 2px;
}

:focus-visible {
  outline: 2px solid var(--gold-accent, #FFB454);
  outline-offset: 3px;
}

section[id], div[id^="modal-art-"], .policy-card, .article-modal {
  scroll-margin-top: 88px;
}

/* 按钮与可交互元素触摸热区保障 */
button, .btn, .topic-read-btn, .modal-close-icon, .modal-back-btn, .footer-link {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

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