/* ============================================================
   糖心传媒 · 全局样式表
   域名：y33spl.cn | 版本：2.0 | 更新：2025
   ============================================================ */

/* ---------- CSS变量 ---------- */
:root {
    --primary:    #ff6b81;
    --primary-d:  #e84d65;
    --secondary:  #6c5ce7;
    --secondary-d:#5a4bd1;
    --accent:     #fd79a8;
    --gold:       #fdcb6e;
    --teal:       #00cec9;
    --green:      #00b894;
    --text:       #2d3436;
    --text-light: #636e72;
    --text-muted: #b2bec3;
    --bg:         #f8f9fc;
    --bg-card:    #ffffff;
    --border:     #dfe6e9;
    --shadow-sm:  0 2px 8px rgba(0,0,0,.06);
    --shadow-md:  0 4px 20px rgba(0,0,0,.10);
    --shadow-lg:  0 8px 40px rgba(0,0,0,.14);
    --radius-sm:  6px;
    --radius-md:  12px;
    --radius-lg:  20px;
    --radius-xl:  30px;
    --transition: .25s ease;
    --max-w:      1200px;
}

/* ---------- 重置 ---------- */
*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior:smooth; }
body {
    font-family: 'PingFang SC','Microsoft YaHei','Hiragino Sans GB',sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.7;
    font-size: 15px;
}
a { text-decoration:none; color:inherit; transition:color var(--transition); }
a:hover { color:var(--primary); }
img { max-width:100%; height:auto; display:block; }
ul { list-style:none; }
button { cursor:pointer; font-family:inherit; }

/* ---------- 顶部公告栏 ---------- */
.mmyceqo {
    background: linear-gradient(90deg, var(--secondary) 0%, var(--primary) 100%);
    color: #fff;
    font-size: 13px;
    padding: 6px 20px;
}
.1r9nh {
    max-width: var(--max-w);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 6px;
}

/* ---------- 主导航 ---------- */
#main-header {
    background: #fff;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
}
.nav-container {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 12px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}
.logo img { height:40px; width:40px; object-fit:contain; border-radius:8px; }
.logo-text {
    font-size: 22px;
    font-weight: 800;
    background: linear-gradient(45deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.logo-text em { font-style:normal; }

/* 导航链接 */
.nav-links {
    display: flex;
    gap: 6px;
    align-items: center;
}
.nav-links li a {
    font-size: 15px;
    font-weight: 500;
    padding: 7px 16px;
    border-radius: var(--radius-xl);
    transition: background var(--transition), color var(--transition);
}
.nav-links li a:hover,
.nav-links li a.active {
    background: var(--primary);
    color: #fff !important;
    -webkit-text-fill-color: #fff;
}

/* 汉堡菜单 */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    padding: 6px;
    border-radius: var(--radius-sm);
}
.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: transform var(--transition), opacity var(--transition);
}
.hamburger[aria-expanded="true"] span:nth-child(1) { transform:translateY(7px) rotate(45deg); }
.hamburger[aria-expanded="true"] span:nth-child(2) { opacity:0; }
.hamburger[aria-expanded="true"] span:nth-child(3) { transform:translateY(-7px) rotate(-45deg); }

/* 搜索框 */
.search-wrap {
    background: #fafbff;
    border-top: 1px solid var(--border);
    padding: 10px 20px;
    position: relative;
}
.search-box {
    max-width: var(--max-w);
    margin: 0 auto;
    display: flex;
    align-items: center;
    background: #fff;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: border-color var(--transition), box-shadow var(--transition);
}
.search-box:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(255,107,129,.15);
}
.search-box input {
    flex: 1;
    border: none;
    outline: none;
    padding: 11px 20px;
    font-size: 14px;
    background: transparent;
    color: var(--text);
}
.search-box button {
    background: var(--primary);
    border: none;
    padding: 11px 20px;
    color: #fff;
    display: flex;
    align-items: center;
    transition: background var(--transition);
}
.search-box button:hover { background: var(--primary-d); }

/* 搜索建议 */
.9ftrtq {
    display: none;
    position: absolute;
    top: calc(100% - 2px);
    left: 20px;
    right: 20px;
    max-width: var(--max-w);
    margin: 0 auto;
    background: #fff;
    border: 1px solid var(--border);
    border-top: none;
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    box-shadow: var(--shadow-md);
    z-index: 999;
    overflow: hidden;
}
.xnqdmil {
    padding: 10px 20px;
    font-size: 14px;
    cursor: pointer;
    transition: background var(--transition);
}
.xnqdmil:hover { background: #fff0f3; color: var(--primary); }

/* 面包屑 */
.breadcrumb {
    background: #fff;
    border-bottom: 1px solid var(--border);
}
.breadcrumb-inner {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 10px 20px;
    font-size: 13px;
    color: var(--text-light);
}
.breadcrumb-inner a { color: var(--text-light); }
.breadcrumb-inner a:hover { color: var(--primary); }
.bc-sep { margin: 0 4px; }

/* ---------- 英雄区域 ---------- */
.hero {
    position: relative;
    height: 520px;
    overflow: hidden;
}
.hero-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center top;
}
.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(108,92,231,.65) 0%, rgba(255,107,129,.55) 100%);
}
.hero-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: #fff;
    width: 90%;
    max-width: 700px;
}
.hero-content h1 {
    font-size: clamp(28px, 5vw, 52px);
    font-weight: 900;
    text-shadow: 0 2px 12px rgba(0,0,0,.3);
    margin-bottom: 14px;
    line-height: 1.2;
}
.hero-content p {
    font-size: clamp(14px, 2vw, 20px);
    opacity: .92;
    margin-bottom: 28px;
}
.hero-btn {
    display: inline-block;
    padding: 14px 36px;
    background: #fff;
    color: var(--primary);
    border-radius: var(--radius-xl);
    font-size: 16px;
    font-weight: 700;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition), box-shadow var(--transition);
}
.hero-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    color: var(--primary-d);
}

/* ---------- 通用模块 ---------- */
.section {
    max-width: var(--max-w);
    margin: 70px auto;
    padding: 0 20px;
}
.section-full {
    padding: 70px 20px;
    margin: 0;
}
.section-title {
    text-align: center;
    font-size: clamp(22px, 3vw, 32px);
    font-weight: 800;
    margin-bottom: 12px;
    color: var(--text);
}
.section-subtitle {
    text-align: center;
    font-size: 15px;
    color: var(--text-light);
    margin-bottom: 40px;
}
.section-title::after {
    content: '';
    display: block;
    width: 56px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    margin: 10px auto 0;
    border-radius: 2px;
}

/* ---------- 视频卡片 ---------- */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}
.video-card {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition), box-shadow var(--transition);
    position: relative;
}
.video-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}
.video-thumb {
    position: relative;
    height: 170px;
    overflow: hidden;
}
.video-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform .4s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.06); }
.play-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(.85);
    width: 52px;
    height: 52px;
    background: rgba(0,0,0,.55);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    transition: opacity var(--transition), transform var(--transition);
    backdrop-filter: blur(4px);
}
.play-btn::after {
    content: '';
    border-left: 16px solid #fff;
    border-top: 10px solid transparent;
    border-bottom: 10px solid transparent;
    margin-left: 5px;
}
.video-card:hover .play-btn {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
}
.video-tag {
    position: absolute;
    top: 8px;
    left: 8px;
    color: #fff;
    font-size: 11px;
    padding: 3px 10px;
    border-radius: 20px;
    font-weight: 600;
    letter-spacing: .5px;
}
.video-info { padding: 14px 16px; }
.video-title {
    font-size: 15px;
    font-weight: 700;
    margin-bottom: 10px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.5;
}
.video-meta {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    font-size: 12px;
    color: var(--text-muted);
}
.video-tags {
    margin-top: 8px;
    font-size: 11px;
    color: var(--text-muted);
}

/* ---------- 分类卡片 ---------- */
.cat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 18px;
}
.cat-card {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: 22px 16px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition), box-shadow var(--transition);
    cursor: pointer;
}
.cat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}
.cat-icon { font-size: 38px; margin-bottom: 10px; }
.cat-name { font-size: 15px; font-weight: 600; margin-bottom: 5px; }
.cat-count { font-size: 12px; }

/* ---------- 专家卡片 ---------- */
.expert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 24px;
}
.expert-card {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: 28px 20px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition), box-shadow var(--transition);
    position: relative;
    overflow: hidden;
}
.expert-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
}
.expert-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}
.expert-avatar {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    margin: 0 auto 14px;
    object-fit: cover;
    border: 3px solid var(--primary);
    box-shadow: 0 4px 12px rgba(255,107,129,.25);
}
.expert-name { font-size: 20px; font-weight: 700; margin-bottom: 4px; }
.expert-title { color: var(--primary); font-size: 13px; margin-bottom: 12px; }
.expert-award {
    font-size: 13px;
    color: var(--secondary);
    margin-bottom: 8px;
}
.expert-social { font-size: 12px; color: var(--text-muted); margin-bottom: 16px; }
.expert-btns { display:flex; gap:10px; justify-content:center; }
.expert-btn {
    display: inline-block;
    padding: 8px 18px;
    background: var(--primary);
    color: #fff;
    border-radius: var(--radius-xl);
    font-size: 13px;
    font-weight: 600;
    transition: background var(--transition);
}
.expert-btn:hover { background: var(--primary-d); color:#fff; }
.expert-btn-outline {
    display: inline-block;
    padding: 8px 18px;
    border: 1.5px solid var(--primary);
    color: var(--primary);
    border-radius: var(--radius-xl);
    font-size: 13px;
    font-weight: 600;
    transition: all var(--transition);
}
.expert-btn-outline:hover { background:var(--primary); color:#fff; }

/* ---------- FAQ ---------- */
.faq-list {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: 32px;
    box-shadow: var(--shadow-sm);
}
.faq-item {
    margin-bottom: 22px;
    padding-bottom: 22px;
    border-bottom: 1px solid var(--border);
}
.faq-item:last-child { border-bottom:none; margin-bottom:0; padding-bottom:0; }
.faq-q {
    font-weight: 700;
    font-size: 17px;
    margin-bottom: 10px;
    color: var(--secondary);
    display: flex;
    align-items: flex-start;
    gap: 8px;
}
.faq-q::before { content:'Q'; color:var(--primary); font-weight:900; flex-shrink:0; }
.faq-a {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.8;
    padding-left: 22px;
}

/* ---------- 用户评论 ---------- */
.review-list {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: 32px;
    box-shadow: var(--shadow-sm);
}
.review-item {
    display: flex;
    gap: 18px;
    margin-bottom: 22px;
    padding-bottom: 22px;
    border-bottom: 1px solid var(--border);
}
.review-item:last-child { border-bottom:none; margin-bottom:0; padding-bottom:0; }
.review-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--primary);
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: 700;
    color: #fff;
    font-size: 18px;
    flex-shrink: 0;
}
.review-content h4 { font-size: 15px; font-weight: 700; margin-bottom: 4px; }
.stars { color: var(--gold); font-size: 15px; margin-bottom: 6px; }
.review-text { font-size: 14px; color: var(--text-light); line-height: 1.7; }
.review-date { font-size: 12px; color: var(--text-muted); margin-top: 4px; }

/* ---------- 合作品牌 ---------- */
.partner-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
}
.partner-item {
    padding: 12px 24px;
    background: var(--bg-card);
    border-radius: var(--radius-sm);
    font-weight: 700;
    color: var(--secondary);
    font-size: 15px;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition), box-shadow var(--transition);
}
.partner-item:hover { transform:translateY(-3px); box-shadow:var(--shadow-md); }

/* ---------- 加入社区步骤 ---------- */
.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 20px;
}
.step-card {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: 28px 20px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    position: relative;
}
.step-num {
    font-size: 52px;
    font-weight: 900;
    color: var(--primary);
    opacity: .15;
    line-height: 1;
    margin-bottom: 8px;
}
.step-title { font-size: 18px; font-weight: 700; margin-bottom: 10px; }
.step-desc { font-size: 14px; color: var(--text-light); }

/* ---------- 联系模块 ---------- */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: start;
}
.contact-info-list { display:flex; flex-direction:column; gap:16px; }
.contact-info-item { display:flex; gap:14px; align-items:flex-start; }
.contact-icon { font-size:22px; flex-shrink:0; }
.contact-info-item strong { display:block; font-size:15px; margin-bottom:3px; }
.contact-info-item p { font-size:14px; color:var(--text-light); }

/* ---------- 社交分享栏 ---------- */
.fjbxccn {
    background: linear-gradient(90deg, var(--secondary) 0%, var(--primary) 100%);
    padding: 16px 20px;
}
.zgeep {
    max-width: var(--max-w);
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
}
.pyyaku { color:#fff; font-size:14px; font-weight:600; white-space:nowrap; }
.8oyfzzg { display:flex; gap:10px; flex-wrap:wrap; }
.nh2yk3 {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 7px 16px;
    border: none;
    border-radius: var(--radius-xl);
    font-size: 13px;
    font-weight: 600;
    color: #fff;
    transition: opacity var(--transition), transform var(--transition);
}
.nh2yk3:hover { opacity:.85; transform:translateY(-2px); }
.share-btn.wechat   { background:#07c160; }
.share-btn.weibo    { background:#e6162d; }
.share-btn.douyin   { background:#161823; }
.share-btn.bilibili { background:#00a1d6; }
.share-btn.qq       { background:#1da1f2; }

/* ---------- 页脚 ---------- */
#main-footer { background:#1e2330; color:#c8cdd8; margin-top:0; }
.footer-body { padding: 60px 20px 40px; }
.footer-container {
    max-width: var(--max-w);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 40px;
}
.footer-brand .footer-logo { height:48px; width:48px; margin-bottom:12px; border-radius:10px; }
.footer-col h3 { font-size:20px; font-weight:700; color:#fff; margin-bottom:14px; }
.footer-col h4 { font-size:16px; font-weight:700; color:#fff; margin-bottom:14px; }
.footer-col p { font-size:14px; line-height:1.8; margin-bottom:14px; }
.footer-contact-list { font-size:13px; line-height:2; }
.footer-col ul li { margin-bottom:8px; }
.footer-col ul li a { color:#c8cdd8; font-size:14px; }
.footer-col ul li a:hover { color:var(--primary); }

/* 二维码 */
.qr-codes { display:flex; gap:14px; flex-wrap:wrap; }
.qr-item { text-align:center; }
.qr-item img { border-radius:var(--radius-sm); border:2px solid rgba(255,255,255,.1); }
.qr-item p { font-size:12px; color:#c8cdd8; margin-top:6px; }

/* 版权栏 */
.footer-bottom {
    border-top: 1px solid rgba(255,255,255,.08);
    padding: 20px;
    text-align: center;
}
.footer-bottom-inner { max-width:var(--max-w); margin:0 auto; }
.footer-bottom p { font-size:13px; color:#8a92a0; margin-bottom:6px; }
.footer-bottom strong { color:#fff; }
.footer-update { color:var(--text-muted); }
.footer-links a { color:#8a92a0; font-size:13px; }
.footer-links a:hover { color:var(--primary); }

/* ---------- MCP组件 ---------- */
.lozfh {
    position: fixed;
    bottom: 28px;
    right: 28px;
    width: 52px;
    height: 52px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border: none;
    border-radius: 50%;
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1001;
    transition: transform var(--transition);
}
.lozfh:hover { transform:scale(1.1); }
.zs4uud {
    display: none;
    position: fixed;
    bottom: 90px;
    right: 28px;
    width: 280px;
    background: #fff;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    overflow: hidden;
}
.dseo137 {
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    color: #fff;
    padding: 12px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    font-size: 14px;
}
.dseo137 button { background:none; border:none; color:#fff; font-size:16px; }
.5fny5v04 { padding:16px; }
.5fny5v04 p { font-size:14px; color:var(--text-light); margin-bottom:12px; }
.uvfdmsvi { display:flex; gap:8px; flex-wrap:wrap; }
.uvfdmsvi button {
    padding:6px 14px;
    background:var(--bg);
    border:1px solid var(--border);
    border-radius:var(--radius-xl);
    font-size:13px;
    color:var(--text);
    transition:all var(--transition);
}
.uvfdmsvi button:hover { background:var(--primary); color:#fff; border-color:var(--primary); }
.w6wkr { margin-top:12px; font-size:13px; color:var(--text-light); line-height:1.7; }
.w6wkr a { color:var(--primary); }

/* ---------- 内页通用 ---------- */
.page-hero {
    position: relative;
    height: 280px;
    overflow: hidden;
}
.page-hero img { width:100%; height:100%; object-fit:cover; }
.page-hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(108,92,231,.7), rgba(255,107,129,.6));
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    text-align: center;
    color: #fff;
    padding: 20px;
}
.page-hero-overlay h1 { font-size:clamp(24px,4vw,42px); font-weight:900; margin-bottom:10px; }
.page-hero-overlay p  { font-size:clamp(14px,2vw,18px); opacity:.9; }

/* 内容卡片 */
.content-card {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: 28px;
    box-shadow: var(--shadow-sm);
    margin-bottom: 24px;
}

/* 标签 */
.tag {
    display: inline-block;
    padding: 3px 12px;
    border-radius: var(--radius-xl);
    font-size: 12px;
    font-weight: 600;
    margin: 3px;
}
.tag-primary { background:rgba(255,107,129,.12); color:var(--primary); }
.tag-secondary { background:rgba(108,92,231,.12); color:var(--secondary); }
.tag-green { background:rgba(0,184,148,.12); color:var(--green); }

/* 按钮 */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: var(--radius-xl);
    font-size: 15px;
    font-weight: 600;
    transition: all var(--transition);
    border: none;
}
.btn-primary { background:var(--primary); color:#fff; }
.btn-primary:hover { background:var(--primary-d); color:#fff; transform:translateY(-2px); box-shadow:var(--shadow-md); }
.btn-secondary { background:var(--secondary); color:#fff; }
.btn-secondary:hover { background:var(--secondary-d); color:#fff; transform:translateY(-2px); }
.btn-outline { background:transparent; color:var(--primary); border:2px solid var(--primary); }
.btn-outline:hover { background:var(--primary); color:#fff; }

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

@media (max-width: 768px) {
    .hamburger { display:flex; }
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0; right: 0;
        background: #fff;
        flex-direction: column;
        padding: 16px 20px;
        box-shadow: var(--shadow-md);
        gap: 4px;
        z-index: 999;
    }
    .nav-links.open { display:flex; }
    .nav-links li a { display:block; padding:10px 16px; border-radius:var(--radius-sm); }
    nav { position:relative; }
    .hero { height:380px; }
    .footer-container { grid-template-columns: 1fr; gap:28px; }
    .1r9nh { justify-content:center; text-align:center; }
    .zgeep { justify-content:center; }
    .qr-codes { justify-content:center; }
}

@media (max-width: 480px) {
    .hero { height:300px; }
    .video-grid { grid-template-columns: 1fr; }
    .expert-grid { grid-template-columns: 1fr; }
    .cat-grid { grid-template-columns: repeat(2, 1fr); }
    .steps-grid { grid-template-columns: 1fr; }
    .section { margin:40px auto; }
}