/* =============================================
   蘑菇短视频官网 - 主样式表
   ============================================= */

/* --- 基础重置与变量 --- */
:root {
  --primary: #1db87e;
  --primary-dark: #17a06c;
  --secondary: #ff6b35;
  --dark: #1a1a2e;
  --dark-2: #16213e;
  --text: #333;
  --text-light: #666;
  --text-muted: #999;
  --bg-light: #f8fafb;
  --bg-white: #fff;
  --border: #e8edf2;
  --shadow: 0 4px 20px rgba(0,0,0,0.08);
  --shadow-hover: 0 8px 30px rgba(0,0,0,0.15);
  --radius: 12px;
  --radius-sm: 8px;
  --font: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
  font-family: var(--font);
  color: var(--text);
  background: var(--bg-white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--primary); text-decoration: none; transition: color .2s; }
a:hover { color: var(--primary-dark); }

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

ul { list-style: none; }

/* --- 通用工具类 --- */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.section { padding: 80px 0; }
.section-alt { background: var(--bg-light); }
.text-center { text-align: center; }
.text-primary { color: var(--primary); }
.text-secondary { color: var(--secondary); }

.section-header { text-align: center; margin-bottom: 56px; }
.section-header h2 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 12px;
}
.section-header p {
  font-size: 1.05rem;
  color: var(--text-light);
  max-width: 600px;
  margin: 0 auto;
}
.section-divider {
  width: 48px;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  border-radius: 2px;
  margin: 16px auto 0;
}

/* --- 按钮 --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 50px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all .25s;
  text-decoration: none;
}
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  box-shadow: 0 4px 15px rgba(29,184,126,0.35);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(29,184,126,0.45);
  color: #fff;
}
.btn-secondary {
  background: linear-gradient(135deg, var(--secondary), #e55a28);
  color: #fff;
  box-shadow: 0 4px 15px rgba(255,107,53,0.35);
}
.btn-secondary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(255,107,53,0.45);
  color: #fff;
}
.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}
.btn-outline:hover {
  background: var(--primary);
  color: #fff;
}
.btn-lg { padding: 16px 36px; font-size: 1.1rem; }

/* --- 顶部导航 --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--dark);
  text-decoration: none;
}
.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
}
.logo span { color: var(--primary); }

.nav-menu { display: flex; align-items: center; gap: 4px; }
.nav-menu a {
  padding: 8px 14px;
  border-radius: 8px;
  color: var(--text);
  font-size: 0.95rem;
  font-weight: 500;
  transition: all .2s;
}
.nav-menu a:hover, .nav-menu a.active {
  background: rgba(29,184,126,0.1);
  color: var(--primary);
}

.header-cta { display: flex; align-items: center; gap: 10px; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 6px;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--dark);
  border-radius: 2px;
  transition: all .3s;
}

/* --- 搜索框 --- */
.search-bar-wrap {
  background: var(--bg-light);
  border-bottom: 1px solid var(--border);
  padding: 10px 0;
}
.search-bar-inner {
  display: flex;
  align-items: center;
  max-width: 600px;
  margin: 0 auto;
  background: #fff;
  border: 2px solid var(--border);
  border-radius: 50px;
  overflow: hidden;
  transition: border-color .2s;
}
.search-bar-inner:focus-within { border-color: var(--primary); }
.search-bar-inner input {
  flex: 1;
  border: none;
  outline: none;
  padding: 10px 20px;
  font-size: 0.95rem;
  font-family: var(--font);
  background: transparent;
}
.search-bar-inner button {
  background: var(--primary);
  color: #fff;
  border: none;
  padding: 10px 22px;
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: var(--font);
  transition: background .2s;
}
.search-bar-inner button:hover { background: var(--primary-dark); }

/* --- Hero Banner --- */
.hero {
  background: linear-gradient(135deg, var(--dark) 0%, var(--dark-2) 60%, #0f3460 100%);
  color: #fff;
  padding: 90px 0 80px;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(29,184,126,0.15) 0%, transparent 70%);
  border-radius: 50%;
}
.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -5%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(255,107,53,0.1) 0%, transparent 70%);
  border-radius: 50%;
}
.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 1;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(29,184,126,0.2);
  border: 1px solid rgba(29,184,126,0.4);
  color: #4eedb5;
  padding: 5px 14px;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 20px;
}
.hero h1 {
  font-size: 2.8rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 18px;
}
.hero h1 em {
  font-style: normal;
  background: linear-gradient(135deg, var(--primary), #4eedb5);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc {
  font-size: 1.1rem;
  color: rgba(255,255,255,0.75);
  margin-bottom: 30px;
  line-height: 1.8;
}
.hero-stats {
  display: flex;
  gap: 30px;
  margin-bottom: 36px;
}
.hero-stat strong {
  display: block;
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--primary);
}
.hero-stat span { font-size: 0.85rem; color: rgba(255,255,255,0.6); }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-img {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0,0,0,0.4);
  position: relative;
}
.hero-img img { width: 100%; display: block; }

/* --- 功能卡片 --- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 28px;
}
.feature-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: all .3s;
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  transform: scaleX(0);
  transition: transform .3s;
}
.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: var(--primary);
}
.feature-card:hover::before { transform: scaleX(1); }
.feature-icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, rgba(29,184,126,0.1), rgba(29,184,126,0.2));
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
  color: var(--primary);
}
.feature-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 10px;
}
.feature-card p { font-size: 0.95rem; color: var(--text-light); line-height: 1.7; }

/* --- 视频卡片 --- */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 28px;
}
.video-card {
  background: var(--bg-white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: all .3s;
  cursor: pointer;
}
.video-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-hover); }
.video-thumb {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16/9;
  background: var(--dark);
}
.video-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s; }
.video-card:hover .video-thumb img { transform: scale(1.05); }
.video-play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.3);
  opacity: 0;
  transition: opacity .3s;
}
.video-card:hover .video-play-btn { opacity: 1; }
.play-icon {
  width: 60px;
  height: 60px;
  background: rgba(255,255,255,0.95);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  color: var(--primary);
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
  transform: scale(0.9);
  transition: transform .3s;
}
.video-card:hover .play-icon { transform: scale(1); }
.video-duration {
  position: absolute;
  bottom: 10px;
  right: 10px;
  background: rgba(0,0,0,0.75);
  color: #fff;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.8rem;
}
.video-body { padding: 18px; }
.video-tags { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 10px; }
.video-tag {
  background: rgba(29,184,126,0.1);
  color: var(--primary);
  padding: 2px 10px;
  border-radius: 50px;
  font-size: 0.78rem;
  font-weight: 600;
}
.video-body h3 { font-size: 1rem; font-weight: 700; color: var(--dark); margin-bottom: 8px; line-height: 1.5; }
.video-body p { font-size: 0.88rem; color: var(--text-light); margin-bottom: 12px; line-height: 1.6; }
.video-meta { display: flex; gap: 16px; font-size: 0.82rem; color: var(--text-muted); }
.video-meta span { display: flex; align-items: center; gap: 4px; }

/* --- 场景区域 --- */
.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
}
.scenario-card {
  border-radius: var(--radius);
  overflow: hidden;
  position: relative;
  aspect-ratio: 3/4;
  cursor: pointer;
}
.scenario-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .4s;
}
.scenario-card:hover img { transform: scale(1.08); }
.scenario-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.7) 0%, transparent 60%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 20px;
  color: #fff;
}
.scenario-overlay h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 4px; }
.scenario-overlay p { font-size: 0.85rem; opacity: 0.85; }

/* --- 更新日志 --- */
.changelog-list { max-width: 800px; margin: 0 auto; }
.changelog-item {
  display: flex;
  gap: 24px;
  padding: 28px 0;
  border-bottom: 1px solid var(--border);
}
.changelog-item:last-child { border-bottom: none; }
.changelog-version {
  flex-shrink: 0;
  text-align: center;
  width: 90px;
}
.changelog-version .version-tag {
  display: inline-block;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  padding: 4px 12px;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 6px;
}
.changelog-version .version-date { font-size: 0.8rem; color: var(--text-muted); }
.changelog-content h3 { font-size: 1rem; font-weight: 700; color: var(--dark); margin-bottom: 10px; }
.changelog-content ul { padding-left: 0; }
.changelog-content li {
  font-size: 0.92rem;
  color: var(--text-light);
  padding: 4px 0;
  padding-left: 18px;
  position: relative;
}
.changelog-content li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--primary);
}

/* --- FAQ --- */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  overflow: hidden;
  transition: box-shadow .2s;
}
.faq-item:hover { box-shadow: var(--shadow); }
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 22px;
  cursor: pointer;
  font-weight: 600;
  color: var(--dark);
  font-size: 0.98rem;
  user-select: none;
  background: var(--bg-white);
  transition: background .2s;
}
.faq-question:hover { background: rgba(29,184,126,0.04); }
.faq-question.active { color: var(--primary); }
.faq-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: rgba(29,184,126,0.1);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
  transition: transform .3s;
}
.faq-question.active .faq-icon { transform: rotate(45deg); }
.faq-answer {
  display: none;
  padding: 0 22px 18px;
  font-size: 0.93rem;
  color: var(--text-light);
  line-height: 1.8;
  border-top: 1px solid var(--border);
  padding-top: 16px;
}
.faq-answer.open { display: block; }

/* --- 用户评价 --- */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}
.review-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: all .3s;
}
.review-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.review-stars { color: #fbbf24; font-size: 1rem; margin-bottom: 14px; letter-spacing: 2px; }
.review-content {
  font-size: 0.93rem;
  color: var(--text-light);
  line-height: 1.8;
  margin-bottom: 18px;
  font-style: italic;
}
.review-content::before { content: '"'; color: var(--primary); font-size: 1.5rem; line-height: 0; vertical-align: -0.4em; margin-right: 4px; }
.review-author { display: flex; align-items: center; gap: 12px; }
.review-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 1rem;
  flex-shrink: 0;
}
.review-info strong { display: block; font-size: 0.95rem; color: var(--dark); }
.review-info span { font-size: 0.82rem; color: var(--text-muted); }

/* --- 联系我们 --- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}
.contact-info h2 { font-size: 1.8rem; font-weight: 700; color: var(--dark); margin-bottom: 16px; }
.contact-info p { color: var(--text-light); margin-bottom: 28px; line-height: 1.8; }
.contact-items { display: flex; flex-direction: column; gap: 16px; }
.contact-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 20px;
  background: var(--bg-light);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}
.contact-item-icon {
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.1rem;
  flex-shrink: 0;
}
.contact-item strong { display: block; font-size: 0.9rem; color: var(--dark); }
.contact-item span { font-size: 0.85rem; color: var(--text-light); }
.contact-form-wrap {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px;
  box-shadow: var(--shadow);
}
.contact-form-wrap h3 { font-size: 1.2rem; font-weight: 700; color: var(--dark); margin-bottom: 24px; }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 0.9rem; font-weight: 600; color: var(--text); margin-bottom: 6px; }
.form-group input, .form-group textarea, .form-group select {
  width: 100%;
  padding: 11px 16px;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg-white);
  transition: border-color .2s;
  outline: none;
}
.form-group input:focus, .form-group textarea:focus { border-color: var(--primary); }
.form-group textarea { min-height: 100px; resize: vertical; }

/* --- 页脚 --- */
.site-footer {
  background: var(--dark);
  color: rgba(255,255,255,0.7);
  padding: 60px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-brand .logo { color: #fff; margin-bottom: 16px; }
.footer-brand p { font-size: 0.9rem; line-height: 1.8; margin-bottom: 20px; }
.footer-social { display: flex; gap: 10px; }
.social-btn {
  width: 38px;
  height: 38px;
  border-radius: 8px;
  background: rgba(255,255,255,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.7);
  font-size: 0.9rem;
  transition: all .2s;
}
.social-btn:hover { background: var(--primary); color: #fff; }
.footer-col h4 { font-size: 1rem; font-weight: 700; color: #fff; margin-bottom: 18px; }
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col ul a {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.6);
  transition: color .2s;
}
.footer-col ul a:hover { color: var(--primary); }
.footer-bottom {
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.4);
  flex-wrap: wrap;
  gap: 10px;
}
.footer-bottom a { color: rgba(255,255,255,0.4); }
.footer-bottom a:hover { color: var(--primary); }

/* --- 面包屑 --- */
.breadcrumb {
  background: var(--bg-light);
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}
.breadcrumb-inner {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-muted);
}
.breadcrumb-inner a { color: var(--text-muted); }
.breadcrumb-inner a:hover { color: var(--primary); }
.breadcrumb-inner span { color: var(--text); font-weight: 500; }

/* --- 内页标题区 --- */
.page-hero {
  background: linear-gradient(135deg, var(--dark) 0%, var(--dark-2) 100%);
  color: #fff;
  padding: 60px 0;
  text-align: center;
}
.page-hero h1 { font-size: 2.2rem; font-weight: 800; margin-bottom: 12px; }
.page-hero p { font-size: 1.05rem; color: rgba(255,255,255,0.7); max-width: 600px; margin: 0 auto; }

/* --- 下载区域 --- */
.download-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
}
.download-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  transition: all .3s;
}
.download-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-hover); border-color: var(--primary); }
.download-card-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
  display: block;
}
.download-card h3 { font-size: 1.1rem; font-weight: 700; color: var(--dark); margin-bottom: 8px; }
.download-card p { font-size: 0.88rem; color: var(--text-muted); margin-bottom: 20px; }
.download-card .version-info { font-size: 0.8rem; color: var(--text-muted); margin-top: 10px; }

/* --- 响应式 --- */
@media (max-width: 1024px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-img { display: none; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .section { padding: 60px 0; }
  .hero { padding: 60px 0; }
  .hero h1 { font-size: 2rem; }
  .section-header h2 { font-size: 1.6rem; }
  .nav-menu { display: none; position: absolute; top: 70px; left: 0; right: 0; background: #fff; flex-direction: column; padding: 16px; border-bottom: 1px solid var(--border); box-shadow: 0 4px 20px rgba(0,0,0,0.1); }
  .nav-menu.open { display: flex; }
  .nav-toggle { display: flex; }
  .header-cta .btn { display: none; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .hero-stats { gap: 20px; }
  .hero-stat strong { font-size: 1.3rem; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .hero h1 { font-size: 1.7rem; }
  .hero-actions { flex-direction: column; }
  .btn-lg { width: 100%; justify-content: center; }
}