/* 91PO传媒官网 - 全局样式 */
:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #14141f;
  --bg-card: #1a1a2e;
  --accent-orange: #ff6b35;
  --accent-purple: #7b61ff;
  --accent-gold: #d4af37;
  --text-primary: #ffffff;
  --text-secondary: #a0a0b8;
  --text-muted: #6b6b80;
  --border-color: #2a2a3e;
  --gradient-hero: linear-gradient(135deg, #1a1a2e 0%, #0a0a0f 50%, #1a0a2e 100%);
  --gradient-btn: linear-gradient(135deg, #ff6b35, #ff8c42);
  --gradient-purple: linear-gradient(135deg, #7b61ff, #a78bfa);
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4);
  --radius: 12px;
  --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-purple);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--accent-orange);
}

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, 15, 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);
}

.header-inner nav {
  margin-left: auto;
}

.logo-link {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-link img {
  width: 44px;
  height: 44px;
  border-radius: 10px;
}

.logo-text {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.logo-text span {
  color: var(--accent-orange);
}

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

.main-nav a {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 4px 0;
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
}

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

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

/* Hero */
.hero {
  background: var(--gradient-hero);
  padding: 60px 0 80px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(123, 97, 255, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

.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;
  background: linear-gradient(135deg, #fff 0%, #a78bfa 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-content .subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 32px;
}

.badge {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--gradient-btn);
  color: #fff;
  padding: 14px 32px;
  border-radius: 30px;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 4px 20px rgba(255, 107, 53, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 28px rgba(255, 107, 53, 0.5);
  color: #fff;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  color: var(--text-primary);
  padding: 14px 32px;
  border-radius: 30px;
  font-size: 1rem;
  font-weight: 600;
  border: 2px solid var(--accent-purple);
  margin-left: 16px;
  transition: all 0.2s;
}

.btn-secondary:hover {
  background: var(--accent-purple);
  color: #fff;
}

.hero-image {
  position: relative;
}

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

.hero-image .phone-mockup {
  max-width: 320px;
  margin: 0 auto;
}

/* Section */
.section {
  padding: 72px 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: 28px;
  transition: transform 0.2s, border-color 0.2s;
}

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

.feature-icon {
  width: 56px;
  height: 56px;
  background: var(--gradient-purple);
  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: 0.9rem;
}

/* Showcase Grid */
.showcase-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
  align-items: center;
}

.showcase-grid.reverse {
  direction: rtl;
}

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

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

.showcase-content h3 {
  font-size: 1.5rem;
  margin-bottom: 16px;
  color: var(--accent-orange);
}

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

.showcase-list {
  list-style: none;
  margin-top: 16px;
}

.showcase-list li {
  padding: 8px 0;
  padding-left: 24px;
  position: relative;
  color: var(--text-secondary);
}

.showcase-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--accent-purple);
  font-weight: bold;
}

/* Category Tabs */
.category-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-bottom: 40px;
}

.category-tab {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 10px 20px;
  border-radius: 24px;
  color: var(--text-secondary);
  font-size: 0.9rem;
  transition: all 0.2s;
}

.category-tab:hover,
.category-tab.active {
  background: var(--accent-purple);
  border-color: var(--accent-purple);
  color: #fff;
}

/* Image Gallery */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.gallery-item {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border-color);
  aspect-ratio: 9/16;
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s;
}

.gallery-item:hover img {
  transform: scale(1.05);
}

.gallery-item .caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 12px;
  background: linear-gradient(transparent, rgba(0,0,0,0.85));
  font-size: 0.8rem;
}

/* SEO Content */
.seo-content {
  max-width: 900px;
  margin: 0 auto;
}

.seo-content h2 {
  font-size: 1.75rem;
  margin: 40px 0 16px;
  color: var(--accent-orange);
}

.seo-content h3 {
  font-size: 1.25rem;
  margin: 28px 0 12px;
  color: var(--text-primary);
}

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

.seo-content ul, .seo-content ol {
  color: var(--text-secondary);
  margin: 12px 0 16px 24px;
}

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

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

.download-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 48px;
  max-width: 700px;
  margin: 0 auto;
}

.download-box h2 {
  font-size: 1.75rem;
  margin-bottom: 16px;
}

.download-box p {
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.download-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* Page Content */
.page-hero {
  background: var(--gradient-hero);
  padding: 48px 0;
  text-align: center;
}

.page-hero h1 {
  font-size: 2rem;
  margin-bottom: 8px;
}

.page-hero .breadcrumb {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.page-hero .breadcrumb a {
  color: var(--text-secondary);
}

.page-content {
  padding: 48px 0 80px;
}

.legal-content {
  max-width: 800px;
  margin: 0 auto;
}

.legal-content h2 {
  font-size: 1.35rem;
  margin: 32px 0 12px;
  color: var(--accent-orange);
}

.legal-content h3 {
  font-size: 1.1rem;
  margin: 24px 0 10px;
}

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

.legal-content ul, .legal-content ol {
  margin-left: 24px;
  margin-bottom: 16px;
}

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

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

.footer-brand img {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  margin-bottom: 16px;
}

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

.footer-col h4 {
  font-size: 1rem;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.footer-col ul {
  list-style: none;
}

.footer-col li {
  margin-bottom: 10px;
}

.footer-col a {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

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

.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-muted);
  font-size: 0.85rem;
}

/* Error Pages */
.error-page {
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 40px 20px;
}

.error-code {
  font-size: 8rem;
  font-weight: 800;
  background: var(--gradient-purple);
  -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: 32px;
}

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

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

  .main-nav {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    flex-direction: column;
    padding: 20px;
    gap: 0;
    border-bottom: 1px solid var(--border-color);
  }

  .main-nav.open {
    display: flex;
  }

  .main-nav li {
    border-bottom: 1px solid var(--border-color);
  }

  .main-nav a {
    display: block;
    padding: 14px 0;
  }

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

  .hero-content h1 {
    font-size: 1.75rem;
  }

  .hero-badges {
    justify-content: center;
  }

  .btn-secondary {
    margin-left: 0;
    margin-top: 12px;
  }

  .hero-image .phone-mockup {
    max-width: 260px;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }

  .showcase-grid {
    grid-template-columns: 1fr;
  }

  .showcase-grid.reverse {
    direction: ltr;
  }

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

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .section {
    padding: 48px 0;
  }
}

@media (max-width: 480px) {
  .gallery-grid {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }

  .download-box {
    padding: 28px 20px;
  }
}