/* =============================================
   17C品牌官方网站 - 主样式文件
   外部CSS，符合百度SEO标准
   ============================================= */

/* ---- CSS变量 ---- */
:root {
  --primary: #e8320a;
  --primary-dark: #c42a08;
  --primary-light: #ff5533;
  --secondary: #ff8c00;
  --accent: #ff4500;
  --text-main: #1a1a1a;
  --text-sub: #555;
  --text-light: #888;
  --bg-main: #fff;
  --bg-light: #f8f9fa;
  --bg-card: #fff;
  --border: #e5e5e5;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow: 0 2px 12px rgba(0,0,0,0.08);
  --shadow-hover: 0 6px 24px rgba(0,0,0,0.14);
  --transition: 0.22s ease;
  --font: 'PingFang SC','Microsoft YaHei','Hiragino Sans GB',sans-serif;
}

/* ---- Reset ---- */
*, *::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-main); background: var(--bg-main); line-height: 1.7; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: var(--font); }
input, select, textarea { font-family: var(--font); }

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

/* ---- 顶部Logo栏 ---- */
.top-logo-bar {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #fff;
  padding: 10px 0;
}
.top-logo-bar .container { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 10px; }
.logo-link { display: flex; align-items: center; gap: 12px; }
.logo-wrap { display: flex; flex-direction: column; }
.logo-text { font-size: 2rem; font-weight: 900; letter-spacing: 2px; color: #fff; line-height: 1; }
.logo-slogan { font-size: 0.75rem; color: rgba(255,255,255,0.85); margin-top: 2px; }
.top-bar-right { display: flex; align-items: center; gap: 16px; }
.domain-display { font-size: 0.8rem; color: rgba(255,255,255,0.9); }
.btn-join { background: rgba(255,255,255,0.2); color: #fff; padding: 6px 16px; border-radius: 20px; font-size: 0.85rem; border: 1px solid rgba(255,255,255,0.4); transition: background var(--transition); }
.btn-join:hover { background: rgba(255,255,255,0.35); color: #fff; }

/* ---- 主导航 ---- */
.main-nav { background: #1a1a1a; position: sticky; top: 0; z-index: 100; box-shadow: 0 2px 8px rgba(0,0,0,0.3); }
.main-nav .container { display: flex; align-items: center; }
.nav-list { display: flex; flex-wrap: wrap; }
.nav-list li a { display: block; color: #ddd; padding: 14px 16px; font-size: 0.9rem; font-weight: 500; transition: color var(--transition), background var(--transition); }
.nav-list li a:hover, .nav-list li a.active { color: #fff; background: var(--primary); }
.nav-toggle { display: none; color: #fff; font-size: 1.4rem; padding: 14px 16px; cursor: pointer; }

/* ---- 搜索框 ---- */
.search-bar-wrap { background: #f0f0f0; border-bottom: 1px solid var(--border); padding: 10px 0; }
.search-form { display: flex; gap: 0; max-width: 700px; }
.search-input { flex: 1; padding: 10px 16px; border: 2px solid var(--border); border-right: none; border-radius: var(--radius) 0 0 var(--radius); font-size: 0.95rem; outline: none; transition: border-color var(--transition); }
.search-input:focus { border-color: var(--primary); }
.search-btn { background: var(--primary); color: #fff; padding: 10px 22px; border-radius: 0 var(--radius) var(--radius) 0; font-size: 0.95rem; font-weight: 600; display: flex; align-items: center; gap: 6px; transition: background var(--transition); }
.search-btn:hover { background: var(--primary-dark); }
.search-tip { margin-top: 6px; padding: 8px 14px; background: #fff; border: 1px solid var(--border); border-radius: var(--radius); font-size: 0.85rem; color: var(--text-sub); }

/* ---- 面包屑 ---- */
.breadcrumb-bar { background: var(--bg-light); border-bottom: 1px solid var(--border); padding: 8px 0; }
.breadcrumb { display: flex; flex-wrap: wrap; gap: 6px; font-size: 0.85rem; color: var(--text-light); }
.breadcrumb-item + .breadcrumb-item::before { content: '›'; margin-right: 6px; }
.breadcrumb-item a { color: var(--primary); }
.breadcrumb-item.active { color: var(--text-sub); }

/* ---- 通用Section ---- */
.section { padding: 50px 0; }
.section:nth-child(even) { background: var(--bg-light); }
.section-header { display: flex; align-items: flex-end; justify-content: space-between; flex-wrap: wrap; gap: 10px; margin-bottom: 28px; }
.section-title { font-size: 1.5rem; font-weight: 800; color: var(--text-main); position: relative; padding-left: 14px; }
.section-title::before { content: ''; position: absolute; left: 0; top: 50%; transform: translateY(-50%); width: 4px; height: 22px; background: var(--primary); border-radius: 2px; }
.section-subtitle { font-size: 0.9rem; color: var(--text-light); margin-top: 4px; }
.more-link { font-size: 0.88rem; color: var(--primary); white-space: nowrap; }
.more-link:hover { text-decoration: underline; }

/* ---- 首屏Hero ---- */
.hero-section { background: linear-gradient(135deg, #fff5f3 0%, #fff 100%); padding: 60px 0; border-bottom: 1px solid var(--border); }
.hero-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
.hero-title { font-size: 2.4rem; font-weight: 900; line-height: 1.2; margin-bottom: 12px; }
.hero-highlight { color: var(--primary); }
.hero-subtitle { font-size: 1.1rem; color: var(--primary); font-weight: 600; margin-bottom: 14px; }
.hero-desc { color: var(--text-sub); font-size: 0.95rem; margin-bottom: 20px; line-height: 1.8; }
.hero-stats { display: flex; gap: 24px; margin-bottom: 24px; }
.stat-item { text-align: center; }
.stat-item strong { display: block; font-size: 1.3rem; font-weight: 800; color: var(--primary); }
.stat-item span { font-size: 0.8rem; color: var(--text-light); }
.hero-btns { display: flex; gap: 12px; flex-wrap: wrap; }
.hero-image img { width: 100%; border-radius: var(--radius-lg); box-shadow: var(--shadow-hover); }

/* ---- 按钮 ---- */
.btn-primary { background: var(--primary); color: #fff; padding: 12px 28px; border-radius: var(--radius); font-size: 0.95rem; font-weight: 700; display: inline-block; transition: background var(--transition), transform var(--transition); }
.btn-primary:hover { background: var(--primary-dark); color: #fff; transform: translateY(-1px); }
.btn-secondary { background: transparent; color: var(--primary); border: 2px solid var(--primary); padding: 10px 26px; border-radius: var(--radius); font-size: 0.95rem; font-weight: 700; display: inline-block; transition: all var(--transition); }
.btn-secondary:hover { background: var(--primary); color: #fff; }
.btn-sm { background: var(--primary); color: #fff; padding: 6px 14px; border-radius: 4px; font-size: 0.82rem; font-weight: 600; display: inline-block; transition: background var(--transition); }
.btn-sm:hover { background: var(--primary-dark); color: #fff; }

/* ---- 热门资讯 ---- */
.news-list { display: flex; flex-direction: column; gap: 0; }
.news-item { display: flex; align-items: baseline; gap: 10px; padding: 12px 0; border-bottom: 1px solid var(--border); }
.news-item:last-child { border-bottom: none; }
.news-item a { flex: 1; font-size: 0.95rem; color: var(--text-main); transition: color var(--transition); }
.news-item a:hover { color: var(--primary); }
.news-tag { padding: 2px 8px; border-radius: 3px; font-size: 0.75rem; font-weight: 700; flex-shrink: 0; }
.hot-tag { background: var(--primary); color: #fff; }
.new-tag { background: var(--secondary); color: #fff; }
.news-tag:not(.hot-tag):not(.new-tag) { background: #1a7abf; color: #fff; }
.news-meta { font-size: 0.8rem; color: var(--text-light); white-space: nowrap; flex-shrink: 0; }
.news-meta em { color: var(--primary); font-style: normal; }

/* ---- 视频网格 ---- */
.video-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.video-card { background: var(--bg-card); border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow); transition: box-shadow var(--transition), transform var(--transition); }
.video-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-3px); }
.video-thumb-wrap { position: relative; overflow: hidden; aspect-ratio: 16/9; }
.video-thumb { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }
.video-card:hover .video-thumb { transform: scale(1.04); }
.video-play-overlay { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; background: rgba(0,0,0,0); transition: background var(--transition); }
.video-card:hover .video-play-overlay { background: rgba(0,0,0,0.15); }
.play-btn { opacity: 0; transform: scale(0.8); transition: opacity var(--transition), transform var(--transition); background: none; border: none; cursor: pointer; }
.video-card:hover .play-btn { opacity: 1; transform: scale(1); }
.video-duration { position: absolute; bottom: 8px; right: 8px; background: rgba(0,0,0,0.75); color: #fff; font-size: 0.78rem; padding: 2px 7px; border-radius: 3px; }
.video-quality { position: absolute; top: 8px; right: 8px; background: var(--primary); color: #fff; font-size: 0.72rem; padding: 2px 7px; border-radius: 3px; font-weight: 700; }
.video-info { padding: 14px; }
.video-title { font-size: 0.92rem; font-weight: 700; line-height: 1.5; margin-bottom: 8px; }
.video-title a { color: var(--text-main); }
.video-title a:hover { color: var(--primary); }
.video-meta { display: flex; align-items: center; justify-content: space-between; margin-bottom: 8px; font-size: 0.82rem; color: var(--text-light); }
.video-author { display: flex; align-items: center; gap: 6px; }
.author-avatar { width: 24px; height: 24px; border-radius: 50%; object-fit: cover; }
.video-tags { display: flex; flex-wrap: wrap; gap: 5px; margin-bottom: 10px; }
.tag { background: #f0f0f0; color: var(--text-sub); font-size: 0.75rem; padding: 2px 8px; border-radius: 3px; }
.video-actions { display: flex; gap: 6px; flex-wrap: wrap; }
.action-btn { font-size: 0.78rem; color: var(--text-light); padding: 4px 8px; border-radius: 4px; transition: color var(--transition), background var(--transition); }
.action-btn:hover { color: var(--primary); background: #fff0ee; }
.load-more-wrap { text-align: center; margin-top: 32px; }
.btn-load-more { background: var(--bg-light); border: 1px solid var(--border); color: var(--text-sub); padding: 12px 36px; border-radius: var(--radius); font-size: 0.95rem; transition: all var(--transition); }
.btn-load-more:hover { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ---- 专题网格 ---- */
.topic-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.topic-card { background: var(--bg-card); border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow); transition: box-shadow var(--transition), transform var(--transition); }
.topic-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-3px); }
.topic-img { width: 100%; aspect-ratio: 4/3; object-fit: cover; }
.topic-info { padding: 16px; }
.topic-title { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }
.topic-title a { color: var(--text-main); }
.topic-title a:hover { color: var(--primary); }
.topic-desc { font-size: 0.85rem; color: var(--text-sub); margin-bottom: 12px; line-height: 1.6; }
.topic-meta { display: flex; align-items: center; gap: 12px; font-size: 0.82rem; color: var(--text-light); flex-wrap: wrap; }

/* ---- 创作者网格 ---- */
.creator-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; }
.creator-card { background: var(--bg-card); border-radius: var(--radius-lg); padding: 20px 16px; text-align: center; box-shadow: var(--shadow); transition: box-shadow var(--transition), transform var(--transition); }
.creator-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-3px); }
.creator-avatar { width: 80px; height: 80px; border-radius: 50%; object-fit: cover; margin: 0 auto 12px; border: 3px solid var(--border); }
.creator-name { font-size: 0.95rem; font-weight: 700; margin-bottom: 4px; }
.creator-tag { font-size: 0.78rem; color: var(--primary); margin-bottom: 8px; }
.creator-desc { font-size: 0.8rem; color: var(--text-sub); margin-bottom: 10px; line-height: 1.5; }
.creator-stats { display: flex; flex-direction: column; gap: 4px; font-size: 0.78rem; color: var(--text-light); margin-bottom: 12px; }
.creator-stats strong { color: var(--text-main); }
.btn-follow { background: var(--primary); color: #fff; padding: 7px 20px; border-radius: 20px; font-size: 0.82rem; font-weight: 600; display: inline-block; transition: background var(--transition); }
.btn-follow:hover { background: var(--primary-dark); color: #fff; }

/* ---- 互动专区 ---- */
.interact-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.interact-card { background: var(--bg-card); border-radius: var(--radius-lg); padding: 28px 20px; text-align: center; box-shadow: var(--shadow); transition: box-shadow var(--transition), transform var(--transition); }
.interact-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-3px); }
.interact-icon { font-size: 2.2rem; margin-bottom: 12px; }
.interact-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }
.interact-card p { font-size: 0.85rem; color: var(--text-sub); margin-bottom: 14px; line-height: 1.6; }

/* ---- 创作者CTA ---- */
.creator-cta-section { background: linear-gradient(135deg, #fff5f3 0%, #fff0ee 100%); }
.creator-cta-inner { max-width: 700px; }
.creator-cta-inner h2 { font-size: 1.6rem; font-weight: 800; margin-bottom: 12px; }
.creator-cta-inner p { color: var(--text-sub); margin-bottom: 16px; }
.creator-benefits { display: flex; flex-direction: column; gap: 6px; margin-bottom: 20px; }
.creator-benefits li { font-size: 0.9rem; color: var(--text-sub); }

/* ---- 最新更新 ---- */
.latest-list { display: flex; flex-direction: column; gap: 0; }
.latest-item { display: flex; align-items: flex-start; gap: 14px; padding: 14px 0; border-bottom: 1px solid var(--border); }
.latest-item:last-child { border-bottom: none; }
.latest-time { background: var(--primary); color: #fff; font-size: 0.75rem; padding: 3px 8px; border-radius: 3px; white-space: nowrap; flex-shrink: 0; margin-top: 2px; }
.latest-content h4 { font-size: 0.92rem; font-weight: 600; margin-bottom: 4px; }
.latest-content h4 a { color: var(--text-main); }
.latest-content h4 a:hover { color: var(--primary); }
.latest-meta { font-size: 0.8rem; color: var(--text-light); }

/* ---- FAQ ---- */
.faq-list { display: flex; flex-direction: column; gap: 0; }
.faq-item { border-bottom: 1px solid var(--border); }
.faq-question { display: flex; align-items: center; justify-content: space-between; padding: 16px 0; cursor: pointer; }
.faq-question h3 { font-size: 0.95rem; font-weight: 600; flex: 1; }
.faq-arrow { color: var(--primary); font-size: 0.85rem; transition: transform var(--transition); }
.faq-item.open .faq-arrow { transform: rotate(180deg); }
.faq-answer { display: none; padding: 0 0 16px; }
.faq-item.open .faq-answer { display: block; }
.faq-answer p { font-size: 0.9rem; color: var(--text-sub); line-height: 1.8; }

/* ---- 用户评论 ---- */
.review-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.review-card { background: var(--bg-card); border-radius: var(--radius-lg); padding: 20px; box-shadow: var(--shadow); }
.review-header { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.review-avatar { width: 48px; height: 48px; border-radius: 50%; object-fit: cover; }
.review-name { font-size: 0.9rem; font-weight: 700; display: block; }
.review-stars { color: #f5a623; font-size: 0.85rem; }
.review-text { font-size: 0.88rem; color: var(--text-sub); line-height: 1.7; margin-bottom: 10px; }
.review-date { font-size: 0.78rem; color: var(--text-light); }

/* ---- 帮助中心 ---- */
.help-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.help-card { background: var(--bg-card); border-radius: var(--radius-lg); padding: 24px 20px; text-align: center; box-shadow: var(--shadow); transition: box-shadow var(--transition), transform var(--transition); display: block; color: var(--text-main); }
.help-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-3px); color: var(--text-main); }
.help-icon { font-size: 2rem; margin-bottom: 12px; }
.help-card h3 { font-size: 0.95rem; font-weight: 700; margin-bottom: 8px; }
.help-card p { font-size: 0.82rem; color: var(--text-sub); line-height: 1.6; }

/* ---- 联系我们 ---- */
.contact-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-bottom: 40px; }
.contact-card { background: var(--bg-card); border-radius: var(--radius-lg); padding: 24px 20px; text-align: center; box-shadow: var(--shadow); }
.contact-icon { font-size: 2rem; margin-bottom: 12px; }
.contact-card h3 { font-size: 0.95rem; font-weight: 700; margin-bottom: 8px; }
.contact-card p { font-size: 0.82rem; color: var(--text-sub); margin-bottom: 6px; }
.contact-email { color: var(--primary) !important; font-size: 0.82rem !important; word-break: break-all; }

/* ---- 表单 ---- */
.submit-box { background: var(--bg-light); border-radius: var(--radius-lg); padding: 32px; max-width: 600px; }
.submit-box h2 { font-size: 1.3rem; font-weight: 800; margin-bottom: 8px; }
.submit-box p { color: var(--text-sub); font-size: 0.9rem; margin-bottom: 20px; }
.submit-form { display: flex; flex-direction: column; gap: 12px; }
.form-input { padding: 10px 14px; border: 1px solid var(--border); border-radius: var(--radius); font-size: 0.9rem; outline: none; transition: border-color var(--transition); }
.form-input:focus { border-color: var(--primary); }
.form-textarea { padding: 10px 14px; border: 1px solid var(--border); border-radius: var(--radius); font-size: 0.9rem; outline: none; resize: vertical; transition: border-color var(--transition); }
.form-textarea:focus { border-color: var(--primary); }

/* ---- 筛选栏 ---- */
.filter-bar { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 24px; }
.filter-btn { padding: 7px 16px; border-radius: 20px; font-size: 0.85rem; border: 1px solid var(--border); background: #fff; color: var(--text-sub); transition: all var(--transition); }
.filter-btn.active, .filter-btn:hover { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ---- 页面Hero ---- */
.page-hero { background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%); color: #fff; padding: 40px 0; }
.page-hero h1 { font-size: 1.8rem; font-weight: 900; margin-bottom: 8px; }
.page-hero p { font-size: 0.95rem; color: rgba(255,255,255,0.85); }

/* ---- 关于我们 ---- */
.about-content { max-width: 800px; }
.about-block { margin-bottom: 32px; }
.about-block h2 { font-size: 1.2rem; font-weight: 800; margin-bottom: 12px; color: var(--primary); }
.about-block p { font-size: 0.92rem; color: var(--text-sub); line-height: 1.9; margin-bottom: 10px; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.stat-card { background: var(--bg-light); border-radius: var(--radius); padding: 16px; text-align: center; }
.stat-card strong { display: block; font-size: 1.3rem; font-weight: 800; color: var(--primary); }
.stat-card span { font-size: 0.82rem; color: var(--text-light); }

/* ---- 分类网格 ---- */
.category-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.category-card { background: var(--bg-card); border-radius: var(--radius-lg); padding: 24px 20px; text-align: center; box-shadow: var(--shadow); transition: all var(--transition); display: block; color: var(--text-main); }
.category-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-3px); color: var(--text-main); background: #fff5f3; }
.cat-icon { font-size: 2.2rem; margin-bottom: 10px; }
.category-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 6px; }
.category-card p { font-size: 0.82rem; color: var(--text-sub); margin-bottom: 8px; }
.cat-count { font-size: 0.78rem; color: var(--primary); font-weight: 600; }

/* ---- 创作者权益 ---- */
.benefits-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-bottom: 20px; }
.benefit-card { background: var(--bg-light); border-radius: var(--radius-lg); padding: 24px 20px; text-align: center; }
.benefit-icon { font-size: 2rem; margin-bottom: 10px; }
.benefit-card h3 { font-size: 0.95rem; font-weight: 700; margin-bottom: 8px; }
.benefit-card p { font-size: 0.82rem; color: var(--text-sub); line-height: 1.6; }

/* ---- 底部Logo栏 ---- */
.footer-logo-bar { background: #1a1a1a; padding: 20px 0; }
.footer-logo-wrap { display: flex; align-items: center; gap: 12px; }
.footer-logo-text { font-size: 2rem; font-weight: 900; color: var(--primary); letter-spacing: 2px; }
.footer-logo-slogan { font-size: 0.82rem; color: #888; }

/* ---- 页脚 ---- */
.main-footer { background: #111; color: #aaa; padding: 40px 0 0; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: 32px; margin-bottom: 32px; }
.footer-col-title { color: #fff; font-size: 0.95rem; font-weight: 700; margin-bottom: 14px; }
.footer-about { font-size: 0.85rem; line-height: 1.7; margin-bottom: 8px; }
.footer-domain { font-size: 0.82rem; color: #888; }
.footer-links { display: flex; flex-direction: column; gap: 6px; }
.footer-links a { font-size: 0.85rem; color: #aaa; transition: color var(--transition); }
.footer-links a:hover { color: var(--primary); }
.footer-contact { display: flex; flex-direction: column; gap: 6px; font-size: 0.82rem; margin-bottom: 14px; }
.footer-social { display: flex; gap: 8px; }
.social-btn { background: #333; color: #aaa; padding: 5px 12px; border-radius: 4px; font-size: 0.8rem; transition: all var(--transition); }
.social-btn:hover { background: var(--primary); color: #fff; }
.footer-bottom { border-top: 1px solid #333; padding: 16px 0; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 10px; }
.footer-bottom-left p { font-size: 0.82rem; color: #666; margin-bottom: 3px; }
.footer-update { color: #888 !important; }
.footer-icp { color: #555 !important; font-size: 0.78rem !important; }
.footer-bottom-right { display: flex; gap: 14px; flex-wrap: wrap; }
.footer-bottom-right a { font-size: 0.82rem; color: #666; transition: color var(--transition); }
.footer-bottom-right a:hover { color: var(--primary); }

/* ---- 响应式 ---- */
@media (max-width: 1024px) {
  .creator-grid { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-image { display: none; }
  .video-grid { grid-template-columns: repeat(2, 1fr); }
  .topic-grid { grid-template-columns: repeat(2, 1fr); }
  .creator-grid { grid-template-columns: repeat(2, 1fr); }
  .interact-grid { grid-template-columns: repeat(2, 1fr); }
  .review-grid { grid-template-columns: repeat(2, 1fr); }
  .help-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: repeat(2, 1fr); }
  .category-grid { grid-template-columns: repeat(2, 1fr); }
  .benefits-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; }
  .nav-toggle { display: block; }
  .nav-list { display: none; flex-direction: column; width: 100%; }
  .nav-list.open { display: flex; }
  .nav-list li a { padding: 12px 20px; border-top: 1px solid #333; }
  .section-header { flex-direction: column; align-items: flex-start; }
  .hero-title { font-size: 1.8rem; }
}

@media (max-width: 480px) {
  .video-grid { grid-template-columns: 1fr; }
  .topic-grid { grid-template-columns: 1fr; }
  .creator-grid { grid-template-columns: repeat(2, 1fr); }
  .interact-grid { grid-template-columns: 1fr 1fr; }
  .review-grid { grid-template-columns: 1fr; }
  .help-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr 1fr; }
  .category-grid { grid-template-columns: repeat(2, 1fr); }
  .benefits-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .hero-stats { flex-wrap: wrap; gap: 14px; }
}