/* ==========================================================================
   ByWave 机场 官方落地页样式表
   设计美学：暖纸面上的编辑排版 — 克制、文学性、画廊感
   配色：
     纸面背景: #F6F3EC
     墨色正文: #101418
     克莱因蓝: #1D3FBF (唯一强调色)
     细分割线: rgba(16, 20, 24, 0.12)
   规范：禁止渐变、禁止重于1px阴影、禁止图标堆砌、每屏字号不超过三种
   ========================================================================== */

:root {
  --bg-paper: #F6F3EC;
  --text-ink: #101418;
  --text-muted: rgba(16, 20, 24, 0.68);
  --accent-blue: #1D3FBF;
  --border-line: rgba(16, 20, 24, 0.12);
  --border-dark: rgba(16, 20, 24, 0.24);
  --font-serif: "Fraunces", "Songti SC", "STSong", "SimSun", "Noto Serif SC", serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "IBM Plex Mono", "Courier New", Courier, monospace;
}

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

html {
  background-color: var(--bg-paper);
  color: var(--text-ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--bg-paper);
  color: var(--text-ink);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* 容器规范：编辑留白 */
.container {
  width: 100%;
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 文字与排版规范 */
h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 500;
  color: var(--text-ink);
  line-height: 1.25;
  letter-spacing: -0.02em;
}

p {
  color: var(--text-muted);
  font-size: 1.05rem;
  line-height: 1.8;
}

.mono-tag {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-blue);
  display: inline-block;
  margin-bottom: 12px;
}

/* 极简墨黑胶囊按钮与下划线文本链接 */
.btn-capsule {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--text-ink);
  color: var(--bg-paper);
  padding: 14px 32px;
  border-radius: 9999px;
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  border: 1px solid var(--text-ink);
  transition: background-color 0.2s ease, color 0.2s ease;
  min-height: 48px;
  cursor: pointer;
}

.btn-capsule:hover {
  background-color: transparent;
  color: var(--text-ink);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: transparent;
  color: var(--text-ink);
  padding: 14px 28px;
  border-radius: 9999px;
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  border: 1px solid var(--border-dark);
  transition: border-color 0.2s ease, color 0.2s ease;
  min-height: 48px;
}

.btn-secondary:hover {
  border-color: var(--accent-blue);
  color: var(--accent-blue);
}

.text-link {
  color: var(--text-ink);
  text-decoration: none;
  border-bottom: 1px solid var(--text-ink);
  padding-bottom: 2px;
  transition: color 0.2s ease, border-color 0.2s ease;
  font-family: var(--font-sans);
  font-size: 0.95rem;
}

.text-link:hover {
  color: var(--accent-blue);
  border-color: var(--accent-blue);
}

/* 导航栏 */
.site-header {
  border-bottom: 1px solid var(--border-line);
  padding: 24px 0;
  position: sticky;
  top: 0;
  background-color: rgba(246, 243, 236, 0.96);
  backdrop-filter: blur(8px);
  z-index: 100;
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-ink);
}

.brand-name {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

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

.nav-menu a {
  text-decoration: none;
  color: var(--text-ink);
  font-size: 0.92rem;
  transition: color 0.2s ease;
}

.nav-menu a:hover,
.nav-menu a.active {
  color: var(--accent-blue);
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* 章节细线分割 */
.section-divider {
  border: 0;
  border-top: 1px solid var(--border-line);
  margin: 0;
  width: 100%;
}

/* 主视觉 Hero 区域 */
.hero-section {
  padding: 96px 0 80px 0;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 60px;
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.brand-eyebrow {
  display: flex;
  align-items: center;
  gap: 8px;
}

.hero-title {
  font-size: 3.4rem;
  line-height: 1.15;
  margin-top: 4px;
}

.hero-echo {
  display: block;
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.45rem;
  color: var(--accent-blue);
  font-weight: 400;
  margin-top: 10px;
}

.hero-desc {
  font-size: 1.12rem;
  max-width: 580px;
  margin-top: 8px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 20px;
  margin-top: 16px;
}

.hero-art {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-end;
  border-left: 1px solid var(--border-line);
  padding-left: 48px;
}

.art-badge {
  text-align: right;
}

.art-badge-number {
  font-family: var(--font-mono);
  font-size: 3.5rem;
  font-weight: 300;
  color: var(--text-ink);
  line-height: 1;
}

.art-badge-label {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 8px;
}

.wave-line-art {
  margin-top: 36px;
  width: 100%;
  max-width: 320px;
}

/* 核心优势板块 (非对称网格, 3个图文卡片) */
.section-features {
  padding: 88px 0;
}

.section-header {
  margin-bottom: 56px;
}

.section-title {
  font-size: 2.2rem;
  margin-top: 8px;
}

.section-desc {
  max-width: 620px;
  margin-top: 12px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 36px;
}

.feature-card {
  border-top: 1px solid var(--text-ink);
  padding-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.card-num {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-blue);
}

.card-title {
  font-size: 1.35rem;
}

.card-desc {
  font-size: 0.98rem;
  line-height: 1.7;
}

/* 流媒体与 AI 支持图卡板块 */
.section-media-ai {
  padding: 88px 0;
  background-color: rgba(16, 20, 24, 0.02);
}

.media-ai-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.media-ai-card {
  border: 1px solid var(--border-line);
  background-color: var(--bg-paper);
  padding: 36px;
}

.media-ai-card .card-title {
  font-size: 1.45rem;
  margin: 12px 0 16px 0;
}

.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
}

.badge-item {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 6px 12px;
  border: 1px solid var(--border-line);
  color: var(--text-ink);
  background: transparent;
}

/* 价格对比表 */
.section-pricing {
  padding: 88px 0;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-top: 48px;
}

.pricing-card {
  border: 1px solid var(--border-line);
  background-color: var(--bg-paper);
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
}

.pricing-card.featured {
  border: 1px solid var(--text-ink);
}

.pricing-card.featured::before {
  content: "推荐订阅方案";
  position: absolute;
  top: -12px;
  left: 24px;
  background-color: var(--text-ink);
  color: var(--bg-paper);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 2px 10px;
  letter-spacing: 0.05em;
}

.pricing-tier-name {
  font-size: 1.35rem;
}

.pricing-price {
  margin: 20px 0 12px 0;
}

.price-currency {
  font-size: 1.2rem;
  vertical-align: top;
  font-family: var(--font-mono);
}

.price-amount {
  font-family: var(--font-mono);
  font-size: 3rem;
  line-height: 1;
  font-weight: 400;
  color: var(--text-ink);
}

.price-period {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.pricing-specs {
  list-style: none;
  margin: 24px 0 36px 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
  border-top: 1px solid var(--border-line);
  padding-top: 20px;
}

.pricing-specs li {
  font-size: 0.92rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
}

.pricing-specs li::before {
  content: "—";
  color: var(--accent-blue);
  font-family: var(--font-mono);
}

/* 用户评价 (Testimonials) */
.section-reviews {
  padding: 88px 0;
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.review-card {
  border-left: 1px solid var(--border-dark);
  padding-left: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.review-quote {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--text-ink);
  margin-bottom: 20px;
}

.review-author {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-muted);
}

.review-author strong {
  display: block;
  color: var(--text-ink);
  font-size: 0.88rem;
  margin-bottom: 2px;
}

/* 常见问题 (FAQ - 原生 details/summary，无需外置 JS) */
.section-faq {
  padding: 88px 0;
}

.faq-list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--border-line);
  margin-top: 36px;
}

.faq-item {
  border-bottom: 1px solid var(--border-line);
}

.faq-question {
  padding: 22px 0;
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 500;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-ink);
}

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

.faq-question::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.4rem;
  color: var(--accent-blue);
  font-weight: 300;
  transition: transform 0.2s ease;
}

details[open] .faq-question::after {
  content: "—";
}

.faq-answer {
  padding-bottom: 24px;
  color: var(--text-muted);
  font-size: 0.98rem;
  line-height: 1.8;
}

/* 页脚规范：仅保留四个标题，每个打开新页面 */
.site-footer {
  border-top: 1px solid var(--border-line);
  padding: 56px 0 40px 0;
  margin-top: auto;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.footer-nav-four {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  border-bottom: 1px solid var(--border-line);
  padding-bottom: 36px;
}

.footer-col-title {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  margin-bottom: 12px;
  color: var(--text-ink);
}

.footer-col-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.92rem;
  display: inline-block;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.footer-col-link:hover {
  color: var(--accent-blue);
  border-color: var(--accent-blue);
}

.footer-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* 文章列表与单页排版（资讯页专用） */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 36px;
  margin-top: 48px;
}

.article-card {
  border-top: 1px solid var(--text-ink);
  padding-top: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.article-card-title {
  font-size: 1.35rem;
  margin: 10px 0 12px 0;
}

.article-card-title a {
  text-decoration: none;
  color: var(--text-ink);
  transition: color 0.2s ease;
}

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

.article-body {
  max-width: 760px;
  margin: 48px auto;
}

.article-body h2 {
  font-size: 1.65rem;
  margin: 40px 0 16px 0;
  border-bottom: 1px solid var(--border-line);
  padding-bottom: 8px;
}

.article-body h3 {
  font-size: 1.25rem;
  margin: 28px 0 12px 0;
}

.article-body p {
  margin-bottom: 20px;
  font-size: 1.05rem;
}

.article-body ul, .article-body ol {
  margin-bottom: 24px;
  padding-left: 24px;
  color: var(--text-muted);
}

.article-body li {
  margin-bottom: 8px;
  line-height: 1.7;
}

/* 博客外链与内链高亮规范 */
.article-body a.dofollow-partner {
  color: var(--accent-blue);
  text-decoration: none;
  border-bottom: 1px solid var(--accent-blue);
  font-weight: 500;
  transition: opacity 0.2s ease;
}

.article-body a.dofollow-partner:hover {
  opacity: 0.8;
}

.article-body a.internal-home-link {
  color: var(--text-ink);
  text-decoration: none;
  border-bottom: 1px solid var(--text-ink);
  font-weight: 500;
}

.article-body a.internal-home-link:hover {
  color: var(--accent-blue);
  border-color: var(--accent-blue);
}

/* 响应式媒体查询：移动端单栏与点击热区适配 */
@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .hero-art {
    border-left: 0;
    border-top: 1px solid var(--border-line);
    padding-left: 0;
    padding-top: 36px;
    align-items: flex-start;
  }
  
  .art-badge {
    text-align: left;
  }
  
  .features-grid,
  .pricing-grid,
  .reviews-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  
  .media-ai-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  
  .articles-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  
  .footer-nav-four {
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
  }
}

@media (max-width: 680px) {
  .site-header {
    padding: 16px 0;
  }
  
  .nav-wrapper {
    flex-wrap: wrap;
    gap: 16px;
  }
  
  .nav-menu {
    gap: 16px;
    font-size: 0.85rem;
    overflow-x: auto;
    width: 100%;
    padding-bottom: 8px;
  }
  
  .nav-cta {
    width: 100%;
    justify-content: flex-start;
  }
  
  .hero-title {
    font-size: 2.3rem;
  }
  
  .hero-echo {
    font-size: 1.15rem;
  }
  
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }
  
  .btn-capsule, .btn-secondary {
    width: 100%;
    text-align: center;
  }
  
  .footer-nav-four {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  
  .footer-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }
}