/* 抖阴官网 - dyapp.baby 全局样式 */
:root {
  --bg-primary: #0a0a0b;
  --bg-secondary: #141416;
  --bg-card: #1a1a1e;
  --text-primary: #ffffff;
  --text-secondary: #a0a0a8;
  --accent-cyan: #00f2ea;
  --accent-magenta: #ff0050;
  --accent-red: #ff2d55;
  --border-color: #2a2a30;
  --max-width: 1200px;
  --header-height: 64px;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
}

*, *::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;
  display: flex;
  flex-direction: column;
}

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

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

.container {
  width: 100%;
  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, 11, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  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: 12px;
  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;
}

.main-nav { display: flex; align-items: center; gap: 8px; }

.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-cta {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-magenta)) !important;
  color: #fff !important;
  font-weight: 600;
  padding: 8px 20px !important;
}

.nav-cta:hover { opacity: 0.9; color: #fff !important; }

.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 8px;
}

/* Hero */
.hero {
  padding: 60px 0 40px;
  background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero-content h1 {
  font-size: 2.5rem;
  line-height: 1.3;
  margin-bottom: 20px;
}

.hero-content h1 span {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-magenta));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-bottom: 32px;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-magenta));
  color: #fff;
}

.btn-primary:hover { opacity: 0.9; transform: translateY(-2px); color: #fff; }

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

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

.hero-image {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 1px solid var(--border-color);
}

.hero-image img { width: 100%; }

/* Sections */
.section {
  padding: 60px 0;
}

.section-alt { background: var(--bg-secondary); }

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

.section-header h2 {
  font-size: 2rem;
  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(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 32px 24px;
  transition: transform 0.2s, border-color 0.2s;
}

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

.feature-icon {
  font-size: 2rem;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 1.15rem;
  margin-bottom: 10px;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* Screenshot Gallery */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

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

.gallery-item:hover { transform: scale(1.02); }

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

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

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

.content-article h2 {
  font-size: 1.6rem;
  margin: 40px 0 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--accent-cyan);
}

.content-article h3 {
  font-size: 1.25rem;
  margin: 28px 0 12px;
  color: var(--accent-cyan);
}

.content-article p {
  margin-bottom: 16px;
  color: var(--text-secondary);
}

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

.content-article li { margin-bottom: 8px; }

.content-article a { text-decoration: underline; }

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

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

.faq-question {
  padding: 20px 24px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-answer {
  padding: 0 24px 20px;
  color: var(--text-secondary);
  display: none;
}

.faq-item.active .faq-answer { display: block; }

/* Download Steps */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.step-card {
  text-align: center;
  padding: 32px 20px;
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
}

.step-number {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-magenta));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 700;
  margin: 0 auto 16px;
}

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

.breadcrumb a { color: var(--text-secondary); }
.breadcrumb a:hover { color: var(--accent-cyan); }

/* Page Header */
.page-header {
  padding: 48px 0 32px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
}

.page-header h1 { font-size: 2rem; margin-bottom: 8px; }
.page-header p { color: var(--text-secondary); }

/* Legal Pages */
.legal-content {
  padding: 48px 0 80px;
}

.legal-content h2 {
  font-size: 1.4rem;
  margin: 32px 0 12px;
  color: var(--accent-cyan);
}

.legal-content h3 {
  font-size: 1.1rem;
  margin: 24px 0 8px;
}

.legal-content p, .legal-content li {
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.legal-content ul, .legal-content ol {
  margin: 12px 0 12px 24px;
}

/* Error Pages */
.error-page {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 80px 20px;
}

.error-code {
  font-size: 6rem;
  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; }
.error-page p { color: var(--text-secondary); margin-bottom: 24px; }

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

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

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

.footer-col h4 {
  font-size: 1rem;
  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-secondary);
  font-size: 0.9rem;
}

.footer-col a:hover { color: var(--accent-cyan); }

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

.footer-bottom p {
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.footer-links {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--text-secondary);
  font-size: 0.85rem;
}

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

.footer-col a {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
}

/* Internal link highlight */
.internal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 24px 0;
}

.internal-links a {
  padding: 8px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.internal-links a:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

/* Responsive */
@media (max-width: 1024px) {
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .gallery-grid { grid-template-columns: repeat(3, 1fr); }
  .steps-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .menu-toggle { display: block; }

  .main-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--bg-primary);
    flex-direction: column;
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
    transform: translateY(-120%);
    opacity: 0;
    transition: all 0.3s;
  }

  .main-nav.open {
    transform: translateY(0);
    opacity: 1;
  }

  .main-nav a { width: 100%; text-align: center; padding: 12px; }

  .hero { padding: 40px 0 32px; }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 32px;
    text-align: center;
  }

  .hero-content h1 { font-size: 1.75rem; }
  .hero-buttons { justify-content: center; }
  .hero-image { max-width: 280px; margin: 0 auto; }

  .feature-grid { grid-template-columns: 1fr; }
  .gallery-grid { grid-template-columns: repeat(2, 1fr); }
  .steps-grid { grid-template-columns: 1fr; }

  /* 移动端页脚优化 */
  .site-footer {
    padding: 28px 0 max(20px, env(safe-area-inset-bottom, 0px));
  }

  .footer-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px 16px;
    margin-bottom: 20px;
  }

  .footer-brand {
    grid-column: 1 / -1;
    text-align: center;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
  }

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

  .footer-brand p {
    font-size: 0.85rem;
    line-height: 1.65;
    max-width: 300px;
    margin: 10px auto 0;
  }

  .footer-col h4 {
    font-size: 0.9rem;
    margin-bottom: 10px;
    color: var(--accent-cyan);
  }

  .footer-col li { margin-bottom: 4px; }

  .footer-col a {
    font-size: 0.85rem;
    min-height: 36px;
    word-break: break-all;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
    padding-top: 16px;
    gap: 0;
  }

  .footer-bottom p {
    font-size: 0.8rem;
    line-height: 1.5;
  }

  .footer-grid + .footer-bottom .footer-links { display: none; }

  .site-footer:not(:has(.footer-grid)) .footer-bottom {
    gap: 12px;
  }

  .site-footer:not(:has(.footer-grid)) .footer-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px 20px;
    width: 100%;
  }

  .site-footer:not(:has(.footer-grid)) .footer-links a {
    min-height: 36px;
    display: inline-flex;
    align-items: center;
  }

  .section { padding: 40px 0; }
  .section-header h2 { font-size: 1.5rem; }
}

@media (max-width: 480px) {
  .gallery-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .hero-content h1 { font-size: 1.5rem; }
  .btn { padding: 12px 20px; font-size: 0.9rem; }

  .site-footer { padding: 24px 0 max(16px, env(safe-area-inset-bottom, 0px)); }

  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px 12px;
  }

  .footer-col:last-child {
    grid-column: 1 / -1;
    text-align: center;
  }

  .footer-col:last-child ul {
    display: flex;
    flex-direction: column;
    align-items: center;
  }

  .footer-col h4 { font-size: 0.85rem; }

  .footer-col a {
    font-size: 0.8rem;
    min-height: 34px;
    justify-content: center;
  }

  .footer-brand p {
    font-size: 0.8rem;
    max-width: 100%;
  }
}