/* 抖阴官网 - 全局样式 */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121b;
  --bg-card: #1a1a28;
  --accent: #fe2c55;
  --accent-hover: #ff4d6d;
  --cyan: #25f4ee;
  --text-primary: #ffffff;
  --text-secondary: #a0a0b8;
  --text-muted: #6b6b80;
  --border: #2a2a3e;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(0,0,0,0.4);
  --max-width: 1200px;
  --header-h: 70px;
  --safe-top: env(safe-area-inset-top, 0px);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.8;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-tap-highlight-color: transparent;
}

a { color: var(--cyan); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--accent); }

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

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 20px; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10,10,15,0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding-top: var(--safe-top);
}

.header-inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.logo-link { display: flex; align-items: center; gap: 12px; }
.logo-link img { width: 42px; height: 42px; border-radius: 10px; }
.logo-text { font-size: 1.4rem; font-weight: 700; color: var(--text-primary); }
.logo-text span { color: var(--accent); }

.main-nav { display: flex; gap: 8px; list-style: none; margin: 0; padding: 0; }
.main-nav li { list-style: none; }
.main-nav a {
  color: var(--text-secondary);
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 0.95rem;
  transition: all 0.2s;
}
.main-nav a:hover, .main-nav a.active {
  color: var(--text-primary);
  background: var(--bg-card);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 8px;
  min-width: 44px;
  min-height: 44px;
  border-radius: 8px;
  flex-shrink: 0;
}
.nav-toggle:active { background: var(--bg-card); }

/* 顶部固定广告栏 */
.ads-bar {
  position: sticky;
  top: var(--header-h);
  z-index: 99;
  background: rgba(18, 18, 27, 0.98);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 8px 12px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
  display: flex;
  justify-content: center;
}

#ads {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 6px;
  background: transparent;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
}

#ads > div {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 70px;
  box-sizing: border-box;
}

#ads img {
  width: 65px;
  height: 65px;
  object-fit: cover;
  border-radius: 18px;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.35);
  transition: transform 180ms ease, box-shadow 180ms ease;
  display: block;
  border: none;
  background: linear-gradient(135deg, #fff, #fff);
}

#ads a {
  display: inline-block;
  text-decoration: none;
  border-radius: 15px;
}

#ads img:hover {
  transform: translateY(-4px) scale(1.06);
  box-shadow: 0 10px 24px rgba(254, 44, 85, 0.35);
}

#ads figcaption,
#ads .caption {
  height: 15px;
  font-size: 11px;
  color: var(--text-secondary);
  text-align: center;
  max-width: 70px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  margin-top: 4px;
}

/* PC端广告：居中且间距更分散 */
@media (min-width: 769px) {
  .ads-bar {
    padding: 12px 24px;
  }
  #ads {
    gap: 28px;
    justify-content: center;
    max-width: 900px;
  }
  #ads > div {
    width: 76px;
  }
  #ads img {
    width: 70px;
    height: 70px;
  }
  #ads .caption {
    max-width: 76px;
    font-size: 12px;
  }
}

/* Hero */
.hero {
  padding: 60px 0 80px;
  background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
  text-align: center;
}

.hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  line-height: 1.3;
  margin-bottom: 20px;
  background: linear-gradient(135deg, #fff 0%, var(--cyan) 50%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 720px;
  margin: 0 auto 32px;
}

.btn-group { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin-bottom: 40px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 50px;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all 0.25s;
  text-decoration: none;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 4px 20px rgba(254,44,85,0.4);
}
.btn-primary:hover { background: var(--accent-hover); color: #fff; transform: translateY(-2px); }

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 2px solid var(--border);
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
  margin-top: 20px;
}

.stat-item { text-align: center; }
.stat-num { font-size: 2rem; font-weight: 700; color: var(--accent); }
.stat-label { font-size: 0.9rem; color: var(--text-muted); }

/* Sections */
.section { padding: 64px 0; }
.section-alt { background: var(--bg-secondary); }

.section-header { text-align: center; margin-bottom: 48px; }
.section-header h2 { font-size: 1.8rem; margin-bottom: 12px; }
.section-header p { color: var(--text-secondary); max-width: 600px; margin: 0 auto; }

/* Feature Grid */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: transform 0.25s, border-color 0.25s;
}
.feature-card:hover { transform: translateY(-4px); border-color: var(--accent); }

.feature-icon {
  width: 52px; height: 52px;
  background: linear-gradient(135deg, var(--accent), #ff6b8a);
  border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 16px;
}

.feature-card h3 { font-size: 1.15rem; margin-bottom: 10px; }
.feature-card p { color: var(--text-secondary); font-size: 0.95rem; }

/* Category Grid */
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.category-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: transform 0.25s;
}
.category-card:hover { transform: scale(1.02); }

.category-card img { width: 100%; aspect-ratio: 9/16; object-fit: cover; object-position: top; max-height: 360px; }
.category-card-body { padding: 16px; }
.category-card h3 { font-size: 1rem; margin-bottom: 6px; }
.category-card p { color: var(--text-muted); font-size: 0.85rem; }
.category-tag {
  display: inline-block;
  background: rgba(254,44,85,0.15);
  color: var(--accent);
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 0.75rem;
  margin-bottom: 8px;
}

/* Content Article */
.article-content { max-width: 860px; margin: 0 auto; }
.article-content h2 { font-size: 1.5rem; margin: 40px 0 16px; color: var(--text-primary); border-left: 4px solid var(--accent); padding-left: 16px; }
.article-content h3 { font-size: 1.2rem; margin: 28px 0 12px; color: var(--cyan); }
.article-content p { color: var(--text-secondary); margin-bottom: 16px; text-align: justify; }
.article-content ul, .article-content ol { color: var(--text-secondary); margin: 0 0 16px 24px; }
.article-content li { margin-bottom: 8px; }

/* Screenshot Showcase */
.showcase-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: center;
  margin-bottom: 48px;
}

.showcase-row.reverse { direction: rtl; }
.showcase-row.reverse > * { direction: ltr; }

.showcase-img {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.showcase-img img { width: 100%; }

.showcase-text h3 { font-size: 1.3rem; margin-bottom: 12px; }
.showcase-text p { color: var(--text-secondary); margin-bottom: 12px; }

/* FAQ */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
}
.faq-item summary {
  padding: 18px 24px;
  cursor: pointer;
  font-weight: 600;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  line-height: 1.5;
}
.faq-item summary::after { content: "+"; font-size: 1.2rem; color: var(--accent); flex-shrink: 0; margin-top: 2px; }
.faq-item[open] summary::after { content: "−"; }
.faq-answer { padding: 0 24px 18px; color: var(--text-secondary); font-size: 0.95rem; }

/* Download Steps */
.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 24px; counter-reset: step; }
.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  position: relative;
}
.step-num {
  width: 40px; height: 40px;
  background: var(--accent);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700;
  margin: 0 auto 14px;
}
.step-card h4 { margin-bottom: 8px; }
.step-card p { color: var(--text-muted); font-size: 0.9rem; }

/* Breadcrumb */
.breadcrumb {
  padding: 16px 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}
.breadcrumb a { color: var(--text-secondary); }
.breadcrumb span { margin: 0 8px; }

/* Page Header */
.page-header {
  padding: 48px 0 32px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}
.page-header h1 { font-size: 2rem; margin-bottom: 8px; }
.page-header p { color: var(--text-secondary); }

/* Legal Pages */
.legal-content {
  padding-top: 48px;
  padding-bottom: 80px;
}
.legal-content h2 { font-size: 1.3rem; margin: 32px 0 12px; color: var(--cyan); line-height: 1.4; }
.legal-content p, .legal-content li { color: var(--text-secondary); margin-bottom: 12px; overflow-wrap: break-word; word-break: break-word; }
.legal-content ul { margin-left: 24px; padding: 0; }
.legal-content ul li { margin-bottom: 8px; }
.legal-update { color: var(--text-muted); font-size: 0.9rem; margin-bottom: 32px; }

/* Error Pages */
.error-page {
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 40px 20px;
  box-sizing: border-box;
}
.error-page > div {
  width: 100%;
  max-width: 420px;
  margin: 0 auto;
}
.error-code { font-size: 6rem; font-weight: 800; color: var(--accent); line-height: 1; }
.error-title { font-size: 1.5rem; margin: 16px 0 8px; }
.error-desc { color: var(--text-secondary); margin-bottom: 32px; line-height: 1.7; }
main.error-page + .site-footer { margin-top: 32px; }

/* Footer */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 48px 0 24px;
  margin-top: 64px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 32px;
}

.footer-brand img { width: 48px; margin-bottom: 12px; border-radius: 10px; }
.footer-brand p { color: var(--text-muted); font-size: 0.9rem; max-width: 280px; }

.footer-col h4 { font-size: 0.95rem; margin-bottom: 16px; color: var(--text-primary); }
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 8px; }
.footer-col a { color: var(--text-muted); font-size: 0.9rem; }
.footer-col a:hover { color: var(--accent); }

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Internal Links Box */
.internal-links {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin: 32px 0;
}
.internal-links h3 { font-size: 1rem; margin-bottom: 12px; }
.link-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.link-tag {
  background: var(--bg-secondary);
  color: var(--text-secondary);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.85rem;
  border: 1px solid var(--border);
  transition: all 0.2s;
}
.link-tag:hover { border-color: var(--accent); color: var(--accent); background: rgba(254,44,85,0.08); }

/* Responsive */
@media (max-width: 768px) {
  :root { --header-h: calc(52px + var(--safe-top)); }

  .container { padding: 0 16px; max-width: 100%; }

  /* 导航 */
  .header-inner { padding: 8px 16px; }
  .logo-link { gap: 8px; min-width: 0; flex: 1; }
  .logo-link img { width: 36px; height: 36px; flex-shrink: 0; }
  .logo-text { font-size: 1.15rem; white-space: nowrap; }
  .nav-toggle { display: flex; align-items: center; justify-content: center; }

  .main-nav { display: none; }
  .main-nav.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    width: 100%;
    background: var(--bg-secondary);
    padding: 8px 16px 16px;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
    gap: 4px;
    z-index: 101;
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }
  .main-nav li { width: 100%; }
  .main-nav a {
    display: block;
    width: 100%;
    padding: 14px 16px;
    font-size: 1rem;
    border-radius: 10px;
    box-sizing: border-box;
  }
  .main-nav a:active { background: var(--bg-card); }

  /* 广告居中 */
  .ads-bar { padding: 6px 12px; top: var(--header-h); }
  #ads {
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    width: 100%;
    max-width: 100%;
    padding: 0;
  }
  #ads > div { width: 62px; flex-shrink: 0; }
  #ads img { width: 58px; height: 58px; border-radius: 14px; }
  #ads .caption { max-width: 62px; font-size: 10px; }

  /* Hero */
  .hero { padding: 32px 0 48px; }
  .hero h1 {
    font-size: 1.45rem;
    line-height: 1.4;
    margin-bottom: 14px;
    padding: 0;
    word-break: break-word;
  }
  .hero-desc {
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 24px;
    text-align: left;
  }
  .btn-group { margin-bottom: 28px; }
  .btn-group .btn {
    padding: 12px 28px;
    font-size: 0.95rem;
    min-height: 44px;
    width: 100%;
    max-width: 280px;
    justify-content: center;
  }
  .btn { min-height: 44px; padding: 12px 24px; font-size: 0.95rem; }
  .hero-stats {
    gap: 12px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
  }
  .stat-num { font-size: 1.35rem; }
  .stat-label { font-size: 0.75rem; line-height: 1.3; }

  /* 区块 */
  .section { padding: 40px 0; }
  .section-header { margin-bottom: 28px; }
  .section-header h2 { font-size: 1.35rem; word-break: break-word; }
  .section-header p { font-size: 0.9rem; }

  /* 功能卡片 */
  .feature-grid { grid-template-columns: 1fr; gap: 14px; }
  .feature-card { padding: 20px; }
  .feature-card:hover { transform: none; }
  .feature-icon { width: 44px; height: 44px; font-size: 1.25rem; }
  .feature-card h3 { font-size: 1.05rem; }
  .feature-card p { font-size: 0.9rem; line-height: 1.65; }

  /* 分类双列 */
  .category-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }
  .category-card { min-width: 0; }
  .category-card:hover { transform: none; }
  .category-card img { max-height: 200px; aspect-ratio: 9/14; width: 100%; }
  .category-card-body { padding: 10px; }
  .category-card h3 { font-size: 0.85rem; margin-bottom: 4px; word-break: break-word; }
  .category-card p {
    font-size: 0.75rem;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }
  .category-tag { font-size: 0.68rem; padding: 2px 8px; }

  /* 展示区块 */
  .showcase-row { grid-template-columns: 1fr; gap: 20px; margin-bottom: 32px; }
  .showcase-row.reverse { direction: ltr; }
  .showcase-img { max-width: 260px; margin: 0 auto; width: 100%; }
  .showcase-text { min-width: 0; }
  .showcase-text h3 { font-size: 1.1rem; word-break: break-word; }
  .showcase-text p { font-size: 0.9rem; line-height: 1.7; text-align: left; }

  /* 文章 */
  .article-content { max-width: 100%; }
  .article-content h2 {
    font-size: 1.2rem;
    margin: 28px 0 12px;
    padding-left: 12px;
    word-break: break-word;
  }
  .article-content h3 { font-size: 1.05rem; word-break: break-word; }
  .article-content p { font-size: 0.9rem; text-align: left; line-height: 1.75; }
  .article-content ul, .article-content ol { margin-left: 0; padding-left: 20px; }

  /* FAQ */
  .faq-item summary { padding: 14px 16px; font-size: 0.95rem; }
  .faq-answer { padding: 0 16px 14px; font-size: 0.9rem; }

  /* 步骤 */
  .steps { grid-template-columns: 1fr 1fr; gap: 12px; }
  .step-card { padding: 16px; min-width: 0; }
  .step-card h4 { font-size: 0.95rem; }
  .step-card p { font-size: 0.8rem; }

  /* 内链 */
  .internal-links { padding: 16px; margin: 24px 0; }
  .link-tags { gap: 8px; }
  .link-tag { padding: 8px 14px; font-size: 0.82rem; }

  /* 页头 */
  .page-header { padding: 28px 0 20px; }
  .page-header h1 { font-size: 1.5rem; word-break: break-word; }
  .page-header p { font-size: 0.9rem; line-height: 1.6; }
  .breadcrumb { padding: 8px 0; font-size: 0.85rem; }

  /* 法律页 */
  .legal-content {
    padding-top: 28px;
    padding-bottom: 48px;
  }
  .legal-content h2 { font-size: 1.1rem; margin: 24px 0 10px; }
  .legal-content p, .legal-content li { font-size: 0.9rem; line-height: 1.75; }
  .legal-content ul { margin-left: 0; padding-left: 20px; }
  .legal-update { font-size: 0.85rem; margin-bottom: 20px; }

  /* 错误页 */
  .error-page { min-height: 50vh; padding: 32px 16px; }
  .error-page > div { padding: 0 8px; }
  .error-code { font-size: 4rem; }
  .error-title { font-size: 1.25rem; }
  .error-desc { font-size: 0.9rem; }
  main.error-page + .site-footer { margin-top: 16px; }

  /* 页脚 */
  .site-footer { padding: 32px 0 20px; margin-top: 40px; padding-bottom: calc(20px + env(safe-area-inset-bottom, 0)); }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .footer-brand p { max-width: 100%; }
  .footer-bottom { flex-direction: column; text-align: center; gap: 8px; }
}

@media (max-width: 480px) {
  .hero-stats { gap: 8px; }
  .stat-num { font-size: 1.1rem; }
  .stat-label { font-size: 0.68rem; }
  .steps { grid-template-columns: 1fr; }
  .category-card img { max-height: 180px; }
  .category-grid { gap: 10px; }
}

@media (hover: none) {
  .feature-card:hover,
  .category-card:hover { transform: none; }
  .btn-primary:hover { transform: none; }
  #ads img:hover { transform: none; }
}