/* ===================================================
   17C视频社区 - 主样式文件
   =================================================== */

/* CSS变量 */
:root {
  --primary: #6c3de8;
  --primary-dark: #4a1fc7;
  --secondary: #00c6ff;
  --accent: #ff6b6b;
  --text-dark: #1a1a2e;
  --text-gray: #555577;
  --text-light: #888899;
  --bg-light: #f8f9ff;
  --bg-white: #ffffff;
  --border: #e8e8f0;
  --shadow: 0 4px 24px rgba(108,61,232,0.10);
  --shadow-hover: 0 8px 40px rgba(108,61,232,0.18);
  --radius: 12px;
  --radius-lg: 20px;
  --gradient: linear-gradient(135deg, #6c3de8 0%, #00c6ff 100%);
  --gradient-warm: linear-gradient(135deg, #ff6b6b 0%, #ffa500 100%);
  --font-main: 'PingFang SC', 'Microsoft YaHei', '微软雅黑', sans-serif;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 重置 */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-main);
  color: var(--text-dark);
  background: var(--bg-white);
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; transition: var(--transition); }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

/* 容器 */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.section { padding: 80px 0; }
.section-sm { padding: 50px 0; }

/* 标题 */
.section-title {
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-dark);
  margin-bottom: 12px;
  letter-spacing: -0.5px;
}
.section-subtitle {
  font-size: 1rem;
  color: var(--text-gray);
  margin-bottom: 48px;
}
.section-header { text-align: center; }
.section-header .section-title span { color: var(--primary); }

/* 标签 */
.tag {
  display: inline-block;
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 0.78rem;
  font-weight: 600;
  background: rgba(108,61,232,0.10);
  color: var(--primary);
  margin-bottom: 12px;
  letter-spacing: 0.5px;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 30px;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  text-decoration: none;
}
.btn-primary {
  background: var(--gradient);
  color: #fff;
  box-shadow: 0 4px 20px rgba(108,61,232,0.35);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(108,61,232,0.45);
}
.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}
.btn-outline:hover {
  background: var(--primary);
  color: #fff;
}
.btn-white {
  background: #fff;
  color: var(--primary);
  box-shadow: 0 4px 20px rgba(0,0,0,0.12);
}
.btn-white:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0,0,0,0.18);
}

/* ===== 顶部公告栏 ===== */
.top-bar {
  background: var(--gradient);
  color: #fff;
  text-align: center;
  padding: 8px 20px;
  font-size: 0.85rem;
  font-weight: 500;
}
.top-bar a { color: #fff; text-decoration: underline; }

/* ===== 导航 ===== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 2px 16px rgba(108,61,232,0.06);
}
.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.navbar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--primary);
  letter-spacing: -1px;
}
.navbar-logo img { width: 36px; height: 36px; border-radius: 8px; }
.navbar-logo .logo-text { background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.navbar-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}
.navbar-nav a {
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-dark);
}
.navbar-nav a:hover, .navbar-nav a.active {
  background: rgba(108,61,232,0.08);
  color: var(--primary);
}
.navbar-actions { display: flex; align-items: center; gap: 12px; }
.navbar-toggle { display: none; background: none; border: none; cursor: pointer; padding: 4px; }
.navbar-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-dark);
  margin: 5px 0;
  border-radius: 2px;
  transition: var(--transition);
}

/* ===== 搜索框 ===== */
.search-bar-wrap {
  background: var(--bg-light);
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
}
.search-bar-inner {
  display: flex;
  align-items: center;
  max-width: 700px;
  margin: 0 auto;
  background: #fff;
  border: 2px solid var(--border);
  border-radius: 30px;
  padding: 6px 6px 6px 20px;
  box-shadow: var(--shadow);
  transition: var(--transition);
}
.search-bar-inner:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(108,61,232,0.12);
}
.search-bar-inner input {
  flex: 1;
  border: none;
  outline: none;
  font-size: 0.95rem;
  font-family: var(--font-main);
  background: transparent;
  color: var(--text-dark);
}
.search-bar-inner input::placeholder { color: var(--text-light); }
.search-bar-inner button {
  background: var(--gradient);
  color: #fff;
  border: none;
  border-radius: 24px;
  padding: 8px 20px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  font-family: var(--font-main);
}
.search-bar-inner button:hover { opacity: 0.9; transform: scale(1.02); }
.search-hot-tags {
  text-align: center;
  margin-top: 8px;
  font-size: 0.82rem;
  color: var(--text-light);
}
.search-hot-tags a {
  color: var(--primary);
  margin: 0 4px;
}
.search-hot-tags a:hover { text-decoration: underline; }

/* ===== 英雄区 ===== */
.hero {
  position: relative;
  min-height: 580px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: linear-gradient(135deg, #0f0c29 0%, #302b63 50%, #24243e 100%);
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('../images/hero-banner.jpg');
  background-size: cover;
  background-position: center;
  opacity: 0.35;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(108,61,232,0.7) 0%, rgba(0,198,255,0.3) 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  color: #fff;
  max-width: 700px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: 20px;
  padding: 6px 16px;
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 20px;
  backdrop-filter: blur(8px);
}
.hero-badge .dot { width: 8px; height: 8px; background: #00ff88; border-radius: 50%; animation: pulse 2s infinite; }
@keyframes pulse { 0%,100%{opacity:1;transform:scale(1)} 50%{opacity:0.6;transform:scale(1.3)} }
.hero h1 {
  font-size: 3rem;
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 16px;
  letter-spacing: -1px;
}
.hero h1 .highlight {
  background: linear-gradient(90deg, #fff 0%, #a8edea 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-desc {
  font-size: 1.1rem;
  opacity: 0.88;
  margin-bottom: 32px;
  max-width: 560px;
  line-height: 1.8;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-stats {
  display: flex;
  gap: 40px;
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid rgba(255,255,255,0.2);
}
.hero-stat-item { text-align: center; }
.hero-stat-num { font-size: 1.8rem; font-weight: 900; display: block; }
.hero-stat-label { font-size: 0.82rem; opacity: 0.75; }

/* ===== 视频卡片区 ===== */
.video-section { background: var(--bg-light); }
.video-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}
.video-tab {
  padding: 8px 20px;
  border-radius: 20px;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  border: 2px solid var(--border);
  background: #fff;
  color: var(--text-gray);
  transition: var(--transition);
}
.video-tab.active, .video-tab:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}
.video-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.video-card {
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}
.video-thumb {
  position: relative;
  padding-top: 56.25%;
  overflow: hidden;
  background: #1a1a2e;
}
.video-thumb img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.06); }
.video-play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--transition);
  background: rgba(108,61,232,0.45);
}
.video-card:hover .video-play-btn { opacity: 1; }
.video-play-btn svg {
  width: 52px;
  height: 52px;
  fill: #fff;
  filter: drop-shadow(0 2px 8px rgba(0,0,0,0.4));
  transform: scale(0.8);
  transition: transform 0.3s ease;
}
.video-card:hover .video-play-btn svg { transform: scale(1); }
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.7);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 4px;
}
.video-badge {
  position: absolute;
  top: 8px;
  left: 8px;
  background: var(--accent);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
}
.video-info { padding: 14px; }
.video-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 8px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-light);
}
.video-author { display: flex; align-items: center; gap: 6px; }
.video-author-avatar {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.65rem;
  color: #fff;
  font-weight: 700;
}
.video-stats { display: flex; gap: 10px; }
.video-stats span { display: flex; align-items: center; gap: 3px; }

/* ===== 品牌故事 ===== */
.brand-story { background: #fff; }
.brand-story-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.brand-story-img {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-hover);
}
.brand-story-img img { width: 100%; height: 380px; object-fit: cover; }
.brand-story-content .tag { margin-bottom: 16px; }
.brand-story-content h2 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 20px;
  line-height: 1.3;
}
.brand-story-content p {
  color: var(--text-gray);
  margin-bottom: 16px;
  line-height: 1.8;
}
.brand-milestones {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 28px;
}
.milestone-item {
  background: var(--bg-light);
  border-radius: var(--radius);
  padding: 16px;
  border-left: 3px solid var(--primary);
}
.milestone-num { font-size: 1.5rem; font-weight: 900; color: var(--primary); }
.milestone-label { font-size: 0.82rem; color: var(--text-gray); }

/* ===== 功能特性 ===== */
.features { background: var(--bg-light); }
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.feature-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  box-shadow: var(--shadow);
  transition: var(--transition);
  border: 1px solid var(--border);
}
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--primary);
}
.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 1.5rem;
}
.feature-card h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 10px; }
.feature-card p { font-size: 0.88rem; color: var(--text-gray); line-height: 1.7; }

/* ===== 场景推荐 ===== */
.scenarios { background: #fff; }
.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.scenario-card {
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
  cursor: pointer;
  box-shadow: var(--shadow);
}
.scenario-card img {
  width: 100%;
  height: 260px;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.scenario-card:hover img { transform: scale(1.05); }
.scenario-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.7) 0%, transparent 60%);
  display: flex;
  align-items: flex-end;
  padding: 24px;
}
.scenario-text h3 { color: #fff; font-size: 1.1rem; font-weight: 700; margin-bottom: 4px; }
.scenario-text p { color: rgba(255,255,255,0.8); font-size: 0.82rem; }
.scenario-tag {
  position: absolute;
  top: 16px;
  left: 16px;
  background: var(--primary);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 20px;
}

/* ===== 用户评价 ===== */
.reviews { background: var(--bg-light); }
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.review-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transition: var(--transition);
}
.review-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }
.review-header { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.review-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 1rem;
  flex-shrink: 0;
}
.review-name { font-weight: 700; font-size: 0.9rem; }
.review-location { font-size: 0.75rem; color: var(--text-light); }
.review-stars { color: #ffc107; font-size: 0.85rem; margin-bottom: 10px; }
.review-text { font-size: 0.85rem; color: var(--text-gray); line-height: 1.7; }
.review-tag {
  display: inline-block;
  margin-top: 12px;
  padding: 3px 10px;
  background: rgba(108,61,232,0.08);
  color: var(--primary);
  border-radius: 10px;
  font-size: 0.75rem;
  font-weight: 600;
}

/* ===== 媒体/达人推荐 ===== */
.media-section { background: #fff; }
.media-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.media-card {
  border-radius: var(--radius);
  padding: 28px;
  background: var(--bg-light);
  border: 1px solid var(--border);
  transition: var(--transition);
}
.media-card:hover { border-color: var(--primary); box-shadow: var(--shadow); }
.media-logo {
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--primary);
  margin-bottom: 12px;
}
.media-quote {
  font-size: 0.88rem;
  color: var(--text-gray);
  line-height: 1.7;
  font-style: italic;
  margin-bottom: 16px;
}
.media-source { font-size: 0.78rem; color: var(--text-light); font-weight: 600; }

/* ===== 购买指南 ===== */
.guide { background: var(--bg-light); }
.guide-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  position: relative;
}
.guide-steps::before {
  content: '';
  position: absolute;
  top: 32px;
  left: 10%;
  right: 10%;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  z-index: 0;
}
.guide-step {
  text-align: center;
  position: relative;
  z-index: 1;
}
.guide-step-num {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--gradient);
  color: #fff;
  font-size: 1.3rem;
  font-weight: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  box-shadow: 0 4px 16px rgba(108,61,232,0.3);
}
.guide-step h3 { font-size: 0.95rem; font-weight: 700; margin-bottom: 8px; }
.guide-step p { font-size: 0.82rem; color: var(--text-gray); line-height: 1.6; }

/* ===== FAQ ===== */
.faq { background: #fff; }
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
  transition: var(--transition);
}
.faq-item.open { border-color: var(--primary); box-shadow: 0 0 0 2px rgba(108,61,232,0.1); }
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 22px;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  background: #fff;
  transition: var(--transition);
}
.faq-item.open .faq-question { background: rgba(108,61,232,0.04); color: var(--primary); }
.faq-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--bg-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: transform 0.3s ease;
  flex-shrink: 0;
}
.faq-item.open .faq-icon { transform: rotate(45deg); background: var(--primary); color: #fff; }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
  padding: 0 22px;
  font-size: 0.88rem;
  color: var(--text-gray);
  line-height: 1.8;
}
.faq-item.open .faq-answer { max-height: 300px; padding: 0 22px 18px; }

/* ===== 联系方式 ===== */
.contact { background: var(--bg-light); }
.contact-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}
.contact-info h2 { font-size: 1.8rem; font-weight: 800; margin-bottom: 16px; }
.contact-info p { color: var(--text-gray); 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;
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.contact-item-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}
.contact-item-text strong { display: block; font-size: 0.88rem; font-weight: 700; }
.contact-item-text span { font-size: 0.82rem; color: var(--text-gray); }
.contact-form {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow);
}
.contact-form h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 24px; }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 0.85rem; font-weight: 600; margin-bottom: 6px; color: var(--text-dark); }
.form-group input, .form-group textarea, .form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-family: var(--font-main);
  color: var(--text-dark);
  background: var(--bg-light);
  transition: var(--transition);
  outline: none;
}
.form-group input:focus, .form-group textarea:focus {
  border-color: var(--primary);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(108,61,232,0.1);
}
.form-group textarea { resize: vertical; min-height: 100px; }

/* ===== CTA横幅 ===== */
.cta-banner {
  background: var(--gradient);
  padding: 80px 0;
  text-align: center;
  color: #fff;
  position: relative;
  overflow: hidden;
}
.cta-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Ccircle cx='30' cy='30' r='20'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}
.cta-banner h2 { font-size: 2.2rem; font-weight: 900; margin-bottom: 12px; position: relative; }
.cta-banner p { font-size: 1.05rem; opacity: 0.88; margin-bottom: 32px; position: relative; }
.cta-banner .btn-white { position: relative; }

/* ===== 页脚 ===== */
.footer {
  background: var(--text-dark);
  color: rgba(255,255,255,0.75);
  padding: 60px 0 0;
}
.footer-inner {
  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 .navbar-logo { margin-bottom: 16px; }
.footer-brand .navbar-logo .logo-text { -webkit-text-fill-color: #fff; background: none; }
.footer-brand p { font-size: 0.85rem; line-height: 1.8; margin-bottom: 20px; }
.footer-social { display: flex; gap: 10px; }
.footer-social a {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: rgba(255,255,255,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  transition: var(--transition);
}
.footer-social a:hover { background: var(--primary); color: #fff; }
.footer-col h4 { color: #fff; font-size: 0.95rem; font-weight: 700; margin-bottom: 16px; }
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col ul li a { font-size: 0.85rem; transition: var(--transition); }
.footer-col ul li a:hover { color: #fff; padding-left: 4px; }
.footer-bottom {
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
}
.footer-bottom-links { display: flex; gap: 20px; }
.footer-bottom-links a:hover { color: #fff; }

/* ===== 面包屑 ===== */
.breadcrumb {
  background: var(--bg-light);
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
}
.breadcrumb-list { display: flex; align-items: center; gap: 8px; font-size: 0.85rem; }
.breadcrumb-list li { display: flex; align-items: center; gap: 8px; color: var(--text-gray); }
.breadcrumb-list li:last-child { color: var(--primary); font-weight: 600; }
.breadcrumb-list li:not(:last-child)::after { content: '/'; color: var(--border); }
.breadcrumb-list a:hover { color: var(--primary); }

/* ===== 内页通用 ===== */
.page-hero {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #fff;
  padding: 60px 0;
  text-align: center;
}
.page-hero h1 { font-size: 2.2rem; font-weight: 900; margin-bottom: 12px; }
.page-hero p { font-size: 1rem; opacity: 0.85; }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .video-grid { grid-template-columns: repeat(3, 1fr); }
  .reviews-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .hero h1 { font-size: 2rem; }
  .section { padding: 50px 0; }
  .section-title { font-size: 1.6rem; }
  .video-grid { grid-template-columns: repeat(2, 1fr); }
  .brand-story-inner { grid-template-columns: 1fr; gap: 32px; }
  .features-grid { grid-template-columns: 1fr 1fr; }
  .scenarios-grid { grid-template-columns: 1fr; }
  .reviews-grid { grid-template-columns: 1fr 1fr; }
  .media-grid { grid-template-columns: 1fr; }
  .guide-steps { grid-template-columns: 1fr 1fr; }
  .guide-steps::before { display: none; }
  .contact-inner { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .navbar-nav { display: none; }
  .navbar-toggle { display: block; }
  .hero-stats { gap: 20px; }
  .hero-stat-num { font-size: 1.4rem; }
}
@media (max-width: 480px) {
  .video-grid { grid-template-columns: 1fr; }
  .features-grid { grid-template-columns: 1fr; }
  .reviews-grid { grid-template-columns: 1fr; }
  .guide-steps { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; }
  .hero h1 { font-size: 1.7rem; }
  .hero-actions { flex-direction: column; }
  .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
}

/* ===== 动画 ===== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-in-up { animation: fadeInUp 0.6s ease forwards; }

/* ===== 滚动条 ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-light); }
::-webkit-scrollbar-thumb { background: var(--primary); border-radius: 3px; }

/* ===== 移动端导航菜单 ===== */
.mobile-nav {
  display: none;
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  background: #fff;
  border-bottom: 1px solid var(--border);
  padding: 16px 20px;
  z-index: 999;
  box-shadow: 0 8px 24px rgba(0,0,0,0.1);
}
.mobile-nav.open { display: block; }
.mobile-nav a {
  display: block;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
  font-weight: 500;
  color: var(--text-dark);
}
.mobile-nav a:last-child { border-bottom: none; }
.mobile-nav a:hover { color: var(--primary); }

/* ===== 内页样式 ===== */
.content-article {
  max-width: 860px;
  margin: 0 auto;
  padding: 48px 20px;
}
.content-article h2 { font-size: 1.5rem; font-weight: 800; margin: 32px 0 16px; color: var(--text-dark); }
.content-article h3 { font-size: 1.15rem; font-weight: 700; margin: 24px 0 12px; color: var(--primary); }
.content-article p { color: var(--text-gray); line-height: 1.9; margin-bottom: 16px; }
.content-article ul { padding-left: 20px; margin-bottom: 16px; }
.content-article ul li { color: var(--text-gray); line-height: 1.8; margin-bottom: 8px; list-style: disc; }
.content-article .highlight-box {
  background: rgba(108,61,232,0.06);
  border-left: 4px solid var(--primary);
  padding: 16px 20px;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 24px 0;
}

/* ===== 更新日志 ===== */
.changelog-list { max-width: 800px; margin: 0 auto; }
.changelog-item {
  display: flex;
  gap: 24px;
  margin-bottom: 40px;
  position: relative;
}
.changelog-item::before {
  content: '';
  position: absolute;
  left: 48px;
  top: 60px;
  bottom: -40px;
  width: 2px;
  background: var(--border);
}
.changelog-item:last-child::before { display: none; }
.changelog-date {
  flex-shrink: 0;
  width: 96px;
  text-align: center;
}
.changelog-date .version {
  display: inline-block;
  background: var(--gradient);
  color: #fff;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 20px;
  margin-bottom: 6px;
}
.changelog-date .date { font-size: 0.78rem; color: var(--text-light); }
.changelog-content {
  flex: 1;
  background: #fff;
  border-radius: var(--radius);
  padding: 20px 24px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}
.changelog-content h3 { font-size: 1rem; font-weight: 700; margin-bottom: 12px; }
.changelog-content ul { padding-left: 16px; }
.changelog-content ul li { font-size: 0.88rem; color: var(--text-gray); margin-bottom: 6px; list-style: disc; }
.changelog-type {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.72rem;
  font-weight: 700;
  margin-right: 6px;
}
.changelog-type.new { background: #e8f5e9; color: #2e7d32; }
.changelog-type.fix { background: #fff3e0; color: #e65100; }
.changelog-type.improve { background: #e3f2fd; color: #1565c0; }

/* ===== 下载中心 ===== */
.download-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.download-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  text-align: center;
  transition: var(--transition);
}
.download-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.download-icon { font-size: 2.5rem; margin-bottom: 16px; }
.download-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }
.download-card p { font-size: 0.82rem; color: var(--text-gray); margin-bottom: 20px; }
.download-meta { font-size: 0.78rem; color: var(--text-light); margin-bottom: 16px; }

/* ===== 帮助中心 ===== */
.help-categories {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 48px;
}
.help-cat {
  background: #fff;
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
}
.help-cat:hover { border-color: var(--primary); transform: translateY(-3px); }
.help-cat-icon { font-size: 2rem; margin-bottom: 12px; }
.help-cat h3 { font-size: 0.95rem; font-weight: 700; margin-bottom: 6px; }
.help-cat p { font-size: 0.8rem; color: var(--text-gray); }