/* 抖阴官网 dyapp.autos - 响应式样式 */
:root {
  --bg-primary: #0a0a0a;
  --bg-secondary: #141414;
  --bg-card: #1a1a1a;
  --text-primary: #ffffff;
  --text-secondary: #b0b0b0;
  --text-muted: #707070;
  --accent-pink: #ff2d55;
  --accent-cyan: #00e5ff;
  --accent-magenta: #ff00aa;
  --border: #2a2a2a;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  --max-width: 1200px;
  --header-height: 64px;
}

*, *::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", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  min-height: 100vh;
}

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

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: 1000;
  background: rgba(10, 10, 10, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  height: var(--header-height);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

.logo-link {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-primary);
}

.logo-link:hover { color: var(--text-primary); }

.logo-img { width: 40px; height: 40px; border-radius: 8px; }

.logo-text {
  font-size: 1.25rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-magenta));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-desktop { display: flex; gap: 28px; list-style: none; }
.nav-desktop a { color: var(--text-secondary); font-size: 0.95rem; }
.nav-desktop a:hover, .nav-desktop a.active { color: var(--accent-pink); }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 4px;
}

.nav-mobile {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: 16px 20px;
  z-index: 999;
}

.nav-mobile.open { display: block; }
.nav-mobile ul { list-style: none; }
.nav-mobile li { border-bottom: 1px solid var(--border); }
.nav-mobile a {
  display: block;
  padding: 14px 0;
  color: var(--text-secondary);
}

/* Hero */
.hero {
  padding: 60px 0 80px;
  background: linear-gradient(180deg, #111 0%, var(--bg-primary) 100%);
  text-align: center;
}

.hero-badge {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(255, 45, 85, 0.15);
  border: 1px solid var(--accent-pink);
  border-radius: 20px;
  color: var(--accent-pink);
  font-size: 0.85rem;
  margin-bottom: 20px;
}

.hero h1 {
  font-size: clamp(1.8rem, 5vw, 2.8rem);
  line-height: 1.3;
  margin-bottom: 16px;
}

.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; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 30px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: transform 0.2s, box-shadow 0.2s;
}

.btn:hover { transform: translateY(-2px); }

.btn-primary {
  background: linear-gradient(135deg, var(--accent-pink), var(--accent-magenta));
  color: #fff;
  box-shadow: 0 4px 20px rgba(255, 45, 85, 0.4);
}

.btn-primary:hover { color: #fff; box-shadow: 0 6px 28px rgba(255, 45, 85, 0.55); }

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

.btn-outline:hover { border-color: var(--accent-cyan); color: var(--accent-cyan); }

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

.section-header { text-align: center; margin-bottom: 48px; }

.section-header h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin-bottom: 12px;
}

.section-header p {
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto;
}

/* Feature grid */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: transform 0.2s, border-color 0.2s;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-pink);
}

.feature-card img { width: 100%; aspect-ratio: 9/16; object-fit: cover; object-position: top; }

.feature-card-body { padding: 20px; }

.feature-card h3 { font-size: 1.1rem; margin-bottom: 8px; }
.feature-card p { color: var(--text-secondary); font-size: 0.9rem; }

/* Category tags */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin: 24px 0;
}

.tag {
  padding: 6px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.tag.active {
  background: rgba(255, 45, 85, 0.15);
  border-color: var(--accent-pink);
  color: var(--accent-pink);
}

/* Content article */
.article-content {
  max-width: 860px;
  margin: 0 auto;
}

.article-content h2 {
  font-size: 1.5rem;
  margin: 40px 0 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--accent-pink);
}

.article-content h3 {
  font-size: 1.2rem;
  margin: 28px 0 12px;
  color: var(--accent-cyan);
}

.article-content p { margin-bottom: 16px; color: var(--text-secondary); }
.article-content ul, .article-content ol { margin: 0 0 16px 24px; color: var(--text-secondary); }
.article-content li { margin-bottom: 8px; }

/* Showcase - PC multi column, mobile single */
.showcase-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.showcase-item {
  background: var(--bg-card);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
}

.showcase-item img {
  width: 100%;
  aspect-ratio: 9/16;
  object-fit: cover;
  object-position: top;
}

.showcase-item figcaption {
  padding: 12px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  text-align: center;
}

/* Steps */
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
  counter-reset: step;
}

.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
  position: relative;
}

.step-card::before {
  counter-increment: step;
  content: counter(step);
  display: block;
  width: 40px;
  height: 40px;
  line-height: 40px;
  background: linear-gradient(135deg, var(--accent-pink), var(--accent-magenta));
  border-radius: 50%;
  margin: 0 auto 16px;
  font-weight: 700;
}

.step-card h3 { margin-bottom: 8px; font-size: 1rem; }
.step-card p { color: var(--text-secondary); font-size: 0.9rem; }

/* FAQ */
.faq-list { max-width: 800px; margin: 0 auto; }

.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
}

.faq-q {
  padding: 18px 20px;
  background: var(--bg-card);
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-q::after { content: "+"; font-size: 1.2rem; color: var(--accent-pink); }
.faq-item.open .faq-q::after { content: "−"; }

.faq-a {
  display: none;
  padding: 0 20px 18px;
  color: var(--text-secondary);
  background: var(--bg-card);
}

.faq-item.open .faq-a { display: block; }

/* Page header for sub pages */
.page-hero {
  padding: 48px 0;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  text-align: center;
}

.page-hero h1 { font-size: clamp(1.6rem, 4vw, 2.2rem); margin-bottom: 8px; }
.page-hero p { color: var(--text-secondary); }

/* Legal pages */
.legal-content {
  max-width: 860px;
  margin: 0 auto;
  padding: 48px 20px 80px;
}

.legal-content h2 { font-size: 1.3rem; margin: 32px 0 12px; color: var(--accent-cyan); }
.legal-content p, .legal-content li { color: var(--text-secondary); margin-bottom: 12px; }
.legal-content ul { margin-left: 24px; }
.legal-content .update-date { color: var(--text-muted); font-size: 0.9rem; margin-bottom: 24px; }

/* Error pages */
.error-page {
  min-height: calc(100vh - var(--header-height) - 200px);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 60px 20px;
}

.error-code {
  font-size: clamp(4rem, 15vw, 8rem);
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-magenta));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}

.error-page h1 { font-size: 1.5rem; margin: 16px 0 8px; }
.error-page p { color: var(--text-secondary); margin-bottom: 24px; }

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

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand p { color: var(--text-secondary); font-size: 0.9rem; margin-top: 12px; }

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

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.footer-bottom a { color: var(--text-muted); }

.footer-copy { margin: 0; }
.footer-meta { margin: 6px 0 0; font-size: 0.8rem; color: var(--text-muted); opacity: 0.85; }

/* Breadcrumb */
.breadcrumb {
  padding: 16px 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.breadcrumb a { color: var(--text-secondary); }
.breadcrumb span { margin: 0 8px; }

/* Internal link box */
.link-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin: 32px 0;
}

.link-box h3 { margin-bottom: 12px; font-size: 1rem; }
.link-box ul { list-style: none; display: flex; flex-wrap: wrap; gap: 12px; }
.link-box a {
  padding: 6px 14px;
  background: var(--bg-secondary);
  border-radius: 6px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* Responsive */
@media (max-width: 992px) {
  .showcase-grid { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .nav-desktop { display: none; }
  .nav-toggle { display: block; }
  .showcase-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .hero { padding: 40px 0 60px; }
  .section { padding: 48px 0; }
  .feature-grid { grid-template-columns: 1fr; }

  .site-footer {
    padding: 28px 0 calc(20px + env(safe-area-inset-bottom, 0px));
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 16px 12px;
    margin-bottom: 20px;
  }

  .footer-brand {
    grid-column: 1 / -1;
    text-align: center;
    padding-bottom: 4px;
    border-bottom: 1px solid var(--border);
  }

  .footer-brand .logo-link {
    justify-content: center;
  }

  .footer-brand p {
    font-size: 0.78rem;
    line-height: 1.55;
    margin-top: 10px;
    padding: 0 4px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }

  .footer-links h4 {
    font-size: 0.82rem;
    margin-bottom: 10px;
    text-align: center;
    color: var(--text-primary);
  }

  .footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 6px;
  }

  .footer-links li { margin-bottom: 0; }

  .footer-links a {
    display: block;
    padding: 8px 6px;
    font-size: 0.78rem;
    text-align: center;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    transition: border-color 0.2s, color 0.2s;
  }

  .footer-links a:hover {
    border-color: var(--accent-pink);
    color: var(--accent-pink);
  }

  .footer-bottom {
    padding-top: 16px;
    padding-left: 8px;
    padding-right: 8px;
  }

  .footer-bottom p { margin: 0; }

  .footer-copy {
    font-size: 0.78rem;
    line-height: 1.5;
  }

  .footer-meta {
    font-size: 0.72rem;
    line-height: 1.5;
    margin-top: 4px;
  }

  .site-footer > .footer-bottom,
  .site-footer > .container.footer-bottom {
    padding: 20px 16px calc(16px + env(safe-area-inset-bottom, 0px));
    text-align: center;
    border-top: 1px solid var(--border);
  }
}

@media (max-width: 480px) {
  .showcase-grid { grid-template-columns: repeat(2, 1fr); }
  .btn { padding: 12px 24px; font-size: 0.9rem; }

  .site-footer { padding-top: 24px; }

  .footer-grid { gap: 12px 10px; }

  .footer-links a {
    padding: 7px 4px;
    font-size: 0.75rem;
  }
}