/* 抖阴官网 dyapp.pics - 全局样式 */
:root {
  --bg-primary: #0a0a0a;
  --bg-secondary: #141414;
  --bg-card: #1a1a1a;
  --text-primary: #ffffff;
  --text-secondary: #b0b0b0;
  --text-muted: #707070;
  --accent-cyan: #25f4ee;
  --accent-magenta: #fe2c55;
  --accent-red: #ff2d55;
  --border-color: #2a2a2a;
  --max-width: 1200px;
  --header-height: 64px;
  --radius: 8px;
  --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(10,10,10,0.95);
  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: 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-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 4px;
}

.main-nav ul {
  display: flex;
  list-style: none;
  gap: 28px;
}

.main-nav a {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 4px 0;
  border-bottom: 2px solid transparent;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--text-primary);
  border-bottom-color: var(--accent-magenta);
}

.btn-download {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: linear-gradient(135deg, var(--accent-magenta), #ff0050);
  color: #fff !important;
  padding: 10px 22px;
  border-radius: 24px;
  font-weight: 600;
  font-size: 0.9rem;
  border: none;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  white-space: nowrap;
}

.btn-download:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(254,44,85,0.4);
  color: #fff !important;
}

/* Hero */
.hero {
  padding: 60px 0 50px;
  background: linear-gradient(180deg, #111 0%, var(--bg-primary) 100%);
  text-align: center;
}

.hero h1 {
  font-size: clamp(1.8rem, 5vw, 2.8rem);
  line-height: 1.3;
  margin-bottom: 16px;
  font-weight: 800;
}

.hero 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 {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 720px;
  margin: 0 auto 28px;
}

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

.btn-secondary {
  display: inline-flex;
  align-items: center;
  padding: 10px 22px;
  border-radius: 24px;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-weight: 500;
  transition: border-color 0.2s, background 0.2s;
}

.btn-secondary:hover {
  border-color: var(--accent-cyan);
  background: rgba(37,244,238,0.08);
  color: var(--text-primary);
}

.hero-showcase {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  max-width: 900px;
  margin: 0 auto;
}

.hero-showcase img {
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow);
}

/* Sections */
.section {
  padding: 50px 0;
}

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

.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 8px;
  text-align: center;
}

.section-subtitle {
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: 36px;
  font-size: 1rem;
}

/* Features */
.features-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: 28px 24px;
  transition: transform 0.2s, border-color 0.2s;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(37,244,238,0.3);
}

.feature-icon {
  font-size: 2rem;
  margin-bottom: 12px;
}

.feature-card h3 {
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Category Grid */
.category-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.category-card {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border-color);
  transition: transform 0.2s;
}

.category-card:hover { transform: scale(1.03); }

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

.category-label {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 10px 12px;
  background: linear-gradient(transparent, rgba(0,0,0,0.85));
  font-size: 0.9rem;
  font-weight: 600;
}

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

.content-article h2 {
  font-size: 1.4rem;
  margin: 32px 0 12px;
  padding-left: 12px;
  border-left: 3px solid var(--accent-magenta);
}

.content-article h3 {
  font-size: 1.15rem;
  margin: 24px 0 10px;
  color: var(--accent-cyan);
}

.content-article p {
  color: var(--text-secondary);
  margin-bottom: 14px;
  text-align: justify;
}

.content-article ul, .content-article ol {
  color: var(--text-secondary);
  margin: 0 0 14px 24px;
}

.content-article li { margin-bottom: 6px; }

.content-article a { word-break: break-all; }

/* Screenshot showcase */
.screenshot-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: center;
  margin: 32px 0;
}

.screenshot-row img {
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow);
}

.screenshot-row .text-block h3 {
  font-size: 1.2rem;
  margin-bottom: 10px;
}

.screenshot-row .text-block p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* Page Header */
.page-header {
  padding: 40px 0 30px;
  text-align: center;
  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);
}

.breadcrumb {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

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

/* Page Content */
.page-content {
  padding: 40px 0 60px;
  flex: 1;
}

.page-content .content-article h2 { margin-top: 28px; }

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

.internal-links h3 {
  font-size: 1rem;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.internal-links ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
}

.internal-links a {
  font-size: 0.9rem;
  padding: 4px 0;
}

/* CTA */
.cta-section {
  text-align: center;
  padding: 50px 20px;
  background: linear-gradient(135deg, rgba(254,44,85,0.12), rgba(37,244,238,0.08));
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.cta-section h2 {
  font-size: 1.6rem;
  margin-bottom: 12px;
}

.cta-section p {
  color: var(--text-secondary);
  margin-bottom: 20px;
}

/* Footer */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 40px 0 24px;
  margin-top: auto;
}

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

.footer-brand p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 12px;
  line-height: 1.6;
}

.footer-col h4 {
  font-size: 0.95rem;
  margin-bottom: 14px;
  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: 0.88rem;
}

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

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom p {
  color: var(--text-muted);
  font-size: 0.82rem;
}

/* Error Pages */
.error-page {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 60px 20px;
}

.error-code {
  font-size: 6rem;
  font-weight: 900;
  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;
  margin-bottom: 16px;
}

.error-page h1 {
  font-size: 1.5rem;
  margin-bottom: 12px;
}

.error-page p {
  color: var(--text-secondary);
  margin-bottom: 24px;
}

/* Responsive */
@media (max-width: 992px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .category-grid { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero-showcase { grid-template-columns: repeat(2, 1fr); }
}

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

  .main-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: rgba(10,10,10,0.98);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 0;
    transform: translateY(-120%);
    opacity: 0;
    transition: transform 0.3s, opacity 0.3s;
    pointer-events: none;
  }

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

  .main-nav ul {
    flex-direction: column;
    align-items: center;
    gap: 16px;
  }

  .header-download { display: none; }

  .hero { padding: 40px 0 30px; }

  .features-grid { grid-template-columns: 1fr; }
  .category-grid { grid-template-columns: repeat(2, 1fr); }
  .screenshot-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .hero-showcase { grid-template-columns: 1fr; max-width: 280px; }
}

@media (max-width: 480px) {
  .category-grid { grid-template-columns: 1fr 1fr; gap: 10px; }
  .category-label { font-size: 0.8rem; padding: 8px; }
}