/* ===== 品牌色板 ===== */
:root {
  --primary: #FF3C00;
  --primary-dark: #D91E00;
  --primary-light: #FF6B35;
  --secondary: #FFB800;
  --secondary-light: #FFD700;
  --accent: #FF6B35;
  --bg-light: #FFF9F5;
  --bg-white: #FFFFFF;
  --text-dark: #1A1A1A;
  --text-gray: #666666;
  --text-light: #999999;
  --border: #E8E8E8;
  --shadow: 0 4px 20px rgba(255,60,0,0.12);
  --shadow-hover: 0 8px 32px rgba(255,60,0,0.20);
  --radius: 16px;
  --radius-sm: 8px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== 全局重置 ===== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  color: var(--text-dark);
  background: var(--bg-light);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}

ul, ol {
  list-style: none;
}

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== 排版层级 ===== */
h1, h2, h3, h4 {
  line-height: 1.2;
}

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

.section-title {
  font-size: 36px;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 12px;
  letter-spacing: -0.5px;
}

.section-desc {
  font-size: 18px;
  color: var(--text-gray);
  max-width: 600px;
  margin: 0 auto;
}

.page-title {
  font-size: 42px;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 12px;
}

.page-desc {
  font-size: 18px;
  color: var(--text-gray);
  margin-bottom: 32px;
}

/* ===== 导航栏 ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0,0,0,0.05);
  transition: var(--transition);
}

.navbar.scrolled {
  box-shadow: 0 2px 20px rgba(0,0,0,0.08);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-left {
  display: flex;
  align-items: center;
}

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

.logo-icon {
  width: 32px;
  height: 32px;
}

.logo-text {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: 0.5px;
}

.nav-center {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-gray);
  padding: 8px 0;
  position: relative;
  transition: var(--transition);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary);
}

.nav-link.active::after,
.nav-link:hover::after {
  width: 100%;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.btn-download {
  display: inline-flex;
  align-items: center;
  padding: 8px 20px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  border-radius: 24px;
  font-size: 14px;
  font-weight: 600;
  transition: var(--transition);
}

.btn-download:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(255,60,0,0.3);
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-dark);
  border-radius: 2px;
  transition: var(--transition);
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

.mobile-menu {
  display: none;
  position: absolute;
  top: 64px;
  left: 0;
  right: 0;
  background: rgba(255,255,255,0.98);
  backdrop-filter: blur(20px);
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.mobile-menu.open {
  display: block;
}

.mobile-link {
  display: block;
  padding: 12px 0;
  font-size: 16px;
  font-weight: 500;
  color: var(--text-dark);
  border-bottom: 1px solid var(--border);
}

.mobile-link.active {
  color: var(--primary);
}

.mobile-download-btn {
  display: block;
  text-align: center;
  padding: 14px;
  margin-top: 12px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  border-radius: 12px;
  font-weight: 600;
}

/* ===== Hero区域 ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 100px 20px 60px;
  background: linear-gradient(160deg, #FFF9F5 0%, #FFE8E0 50%, #FFD6CC 100%);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-particles {
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at 20% 50%, rgba(255,107,53,0.08) 0%, transparent 50%),
              radial-gradient(circle at 80% 30%, rgba(255,184,0,0.06) 0%, transparent 50%),
              radial-gradient(circle at 50% 80%, rgba(255,60,0,0.05) 0%, transparent 50%);
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 800px;
}

.hero-logo {
  width: 120px;
  height: auto;
  margin: 0 auto 24px;
}

.hero-title {
  font-size: 56px;
  font-weight: 800;
  color: var(--text-dark);
  margin-bottom: 16px;
  letter-spacing: -1px;
  line-height: 1.1;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 20px;
  color: var(--text-gray);
  margin-bottom: 40px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  border-radius: 50px;
  font-size: 16px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: var(--transition);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(255,60,0,0.3);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  background: transparent;
  color: var(--primary);
  border-radius: 50px;
  font-size: 16px;
  font-weight: 600;
  border: 2px solid var(--primary);
  cursor: pointer;
  transition: var(--transition);
}

.btn-secondary:hover {
  background: var(--primary);
  color: #fff;
  transform: translateY(-3px);
}

.btn-lg {
  padding: 16px 40px;
  font-size: 18px;
}

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

.stat-item {
  text-align: center;
}

.stat-number {
  display: block;
  font-size: 32px;
  font-weight: 800;
  color: var(--primary);
}

.stat-label {
  font-size: 14px;
  color: var(--text-gray);
  margin-top: 4px;
}

.hero-scroll {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-light);
  font-size: 13px;
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
  40% { transform: translateX(-50%) translateY(-10px); }
  60% { transform: translateX(-50%) translateY(-5px); }
}

/* ===== 特色功能 ===== */
.features {
  padding: 100px 0;
  background: var(--bg-white);
}

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

.feature-card {
  background: var(--bg-light);
  padding: 32px;
  border-radius: var(--radius);
  text-align: center;
  transition: var(--transition);
  border: 1px solid transparent;
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-hover);
  border-color: var(--primary);
}

.feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
}

.feature-card h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text-dark);
}

.feature-card p {
  font-size: 14px;
  color: var(--text-gray);
  line-height: 1.6;
}

/* ===== 热门内容 ===== */
.trending {
  padding: 100px 0;
  background: var(--bg-light);
}

.trending-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.trending-card {
  background: var(--bg-white);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  border: 1px solid var(--border);
}

.trending-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}

.trending-card .card-image {
  width: 100%;
  height: 180px;
  object-fit: cover;
  background: linear-gradient(135deg, var(--primary-light), var(--secondary));
}

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

.trending-card .card-body h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-dark);
}

.trending-card .card-body p {
  font-size: 13px;
  color: var(--text-gray);
  margin-bottom: 12px;
  line-height: 1.5;
}

.trending-card .card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--text-light);
}

.trending-card .card-meta .tag {
  background: var(--bg-light);
  padding: 4px 12px;
  border-radius: 20px;
  color: var(--primary);
  font-weight: 500;
}

/* ===== 下载CTA ===== */
.download-cta {
  padding: 100px 0;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  text-align: center;
  color: #fff;
}

.cta-title {
  font-size: 42px;
  font-weight: 700;
  margin-bottom: 16px;
}

.cta-desc {
  font-size: 18px;
  opacity: 0.9;
  margin-bottom: 36px;
}

.cta-buttons {
  display: flex;
  gap: 20px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.cta-buttons .btn-primary {
  background: #fff;
  color: var(--primary);
  border: none;
}

.cta-buttons .btn-primary:hover {
  background: var(--secondary);
  color: var(--text-dark);
}

.cta-buttons .btn-android {
  background: rgba(255,255,255,0.2);
  color: #fff;
  border: 2px solid rgba(255,255,255,0.5);
}

.cta-buttons .btn-android:hover {
  background: rgba(255,255,255,0.3);
  border-color: #fff;
}

.cta-note {
  font-size: 14px;
  opacity: 0.7;
}

/* ===== 页脚 ===== */
.footer {
  background: #1A1A1A;
  color: rgba(255,255,255,0.8);
  padding: 60px 0 30px;
}

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

.footer-brand {
  max-width: 320px;
}

.footer-logo {
  width: 100px;
  margin-bottom: 16px;
  filter: brightness(0) invert(1);
}

.footer-desc {
  font-size: 14px;
  line-height: 1.6;
  margin-bottom: 20px;
  opacity: 0.7;
}

.footer-social {
  display: flex;
  gap: 12px;
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255,255,255,0.1);
  color: #fff;
  transition: var(--transition);
}

.social-link:hover {
  background: var(--primary);
  transform: translateY(-3px);
}

.footer-links h4 {
  font-size: 16px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 20px;
}

.footer-links a {
  display: block;
  font-size: 14px;
  padding: 6px 0;
  opacity: 0.7;
  transition: var(--transition);
}

.footer-links a:hover {
  opacity: 1;
  color: var(--primary);
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 24px;
  text-align: center;
  font-size: 13px;
  opacity: 0.6;
}

/* ===== 内页Hero ===== */
.page-hero {
  padding: 120px 20px 60px;
  text-align: center;
  background: linear-gradient(160deg, #FFF9F5, #FFE8E0);
}

.page-hero .search-bar {
  max-width: 500px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 12px;
  background: #fff;
  padding: 12px 20px;
  border-radius: 50px;
  box-shadow: var(--shadow);
}

.page-hero .search-input {
  flex: 1;
  border: none;
  outline: none;
  font-size: 16px;
  color: var(--text-dark);
  background: transparent;
}

.page-hero .search-input::placeholder {
  color: var(--text-light);
}

/* ===== 分类标签 ===== */
.category-section {
  padding: 40px 0 80px;
}

.category-tabs {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.category-tab {
  padding: 8px 24px;
  border-radius: 24px;
  background: var(--bg-white);
  border: 1px solid var(--border);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-gray);
  cursor: pointer;
  transition: var(--transition);
}

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

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

/* ===== 下载页 ===== */
.download-platforms {
  display: flex;
  gap: 24px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 40px;
}

.download-card {
  background: var(--bg-white);
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
  min-width: 200px;
  transition: var(--transition);
  border: 1px solid var(--border);
}

.download-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}

.download-card .platform-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 16px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
}

.download-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

.download-card p {
  font-size: 13px;
  color: var(--text-gray);
  margin-bottom: 16px;
}

.download-card .btn-download-sm {
  display: inline-block;
  padding: 10px 24px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  border-radius: 24px;
  font-size: 14px;
  font-weight: 600;
  transition: var(--transition);
}

.download-card .btn-download-sm:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(255,60,0,0.3);
}

.info-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  margin-top: 40px;
}

.info-card {
  background: var(--bg-white);
  padding: 24px;
  border-radius: var(--radius);
  text-align: center;
  border: 1px solid var(--border);
  transition: var(--transition);
}

.info-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.info-card h4 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
}

.info-card p {
  font-size: 13px;
  color: var(--text-gray);
}

/* ===== 创作者页 ===== */
.creator-hero {
  background: linear-gradient(160deg, #FFF9F5, #FFE8E0, #FFD6CC);
}

.creator-grid,
.benefits-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-top: 40px;
}

.creator-card,
.benefit-card {
  background: var(--bg-white);
  padding: 32px;
  border-radius: var(--radius);
  text-align: center;
  border: 1px solid var(--border);
  transition: var(--transition);
}

.creator-card:hover,
.benefit-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}

.creator-card .card-icon,
.benefit-card .card-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 16px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
}

.creator-card h3,
.benefit-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

.creator-card p,
.benefit-card p {
  font-size: 13px;
  color: var(--text-gray);
  line-height: 1.6;
}

.creator-benefits {
  padding: 80px 0;
  background: var(--bg-light);
}

/* ===== 回到顶部 ===== */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow);
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .nav-center {
    display: none;
  }
  
  .hamburger {
    display: flex;
  }
  
  .hero-title {
    font-size: 36px;
  }
  
  .hero-subtitle {
    font-size: 16px;
  }
  
  .hero-stats {
    gap: 24px;
    flex-wrap: wrap;
  }
  
  .stat-number {
    font-size: 24px;
  }
  
  .section-title {
    font-size: 28px;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  
  .page-title {
    font-size: 32px;
  }
  
  .cta-title {
    font-size: 32px;
  }
  
  .category-tabs {
    gap: 8px;
  }
  
  .category-tab {
    padding: 6px 16px;
    font-size: 13px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 28px;
  }
  
  .hero-logo {
    width: 80px;
  }
  
  .btn-lg {
    padding: 12px 28px;
    font-size: 16px;
  }
  
  .hero-actions {
    flex-direction: column;
    align-items: center;
  }
  
  .features-grid,
  .trending-grid,
  .discover-grid {
    grid-template-columns: 1fr;
  }
  
  .back-to-top {
    bottom: 20px;
    right: 20px;
  }
}

@media (min-width: 769px) {
  .mobile-menu {
    display: none !important;
  }
}