*{box-sizing:border-box} :root{--ink:#10221d;--muted:#7d8984;--green:#b8f36a;--green-dark:#1d6a4b;--bg:#f7f9f6;--line:#e8ede8;--navy:#07120f}body{margin:0;background:var(--bg);color:var(--ink);font-family:"DM Sans",sans-serif}button,input{font:inherit}button{cursor:pointer}.app-shell{min-height:100vh}.topbar{height:76px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;padding:0 34px;gap:32px;position:sticky;top:0;z-index:20}.brand{display:flex;align-items:center;gap:11px;text-decoration:none;color:var(--ink);min-width:270px}.brand-mark{width:39px;height:39px;border-radius:12px;background:var(--navy);color:var(--green);display:grid;place-items:center;font:800 15px Manrope;letter-spacing:-1px}.brand-name{font:800 12px Manrope;letter-spacing:.5px;line-height:1.25}.brand-name b{color:#41845d}.brand-name small{display:block;font:600 8px "DM 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solid #e3eae2;border-radius:20px;background:#fff;padding:9px 13px;font-size:10px;font-weight:700;color:#4c6256}.action-btn.on{background:#eff8e8;border-color:#dcebd0;color:#316846}.channel-row{display:flex;align-items:center;gap:10px;margin:18px 0}.channel-row b{font-size:12px}.channel-row small{display:block;color:#929d95;font-size:9px;margin-top:3px}.watch-description{background:#f0f4ef;border-radius:10px;padding:14px;font-size:11px;line-height:1.7;color:#617168}.comment-box{display:flex;gap:8px;margin:15px 0}.comment-box input{flex:1;min-width:0;border:1px solid #e1e9e1;border-radius:9px;padding:10px;font-size:11px}.comment-box button{border:0;background:#183729;color:#fff;border-radius:9px;padding:0 13px;font-size:10px}.comment{padding:12px 0;border-bottom:1px solid var(--line);font-size:11px}.comment b{display:block;margin-bottom:4px}.comment span{color:#718078}.related h3{font:800 14px Manrope;margin:0 0 12px}.related .video-card{margin-bottom:12px}.related .thumb{border-radius:9px}.related .thumb-title{font-size:15px}.related .video-meta{padding:7px 0}.related .teacher-avatar{display:none}.related .video-info h3{font-size:10px}.toast{position:fixed;bottom:22px;left:50%;transform:translate(-50%,20px);background:#10241b;color:#fff;padding:12px 17px;border-radius:9px;font-size:11px;opacity:0;pointer-events:none;transition:.25s;z-index:100}.toast.show{opacity:1;transform:translate(-50%,0)}.notice{padding:12px;background:#f4f8ee;border:1px solid #e6efd9;border-radius:9px;font-size:11px;line-height:1.6;color:#58704f;margin:12px 0}.profile-head{display:flex;align-items:center;gap:13px;margin:10px 0 20px}.profile-big{width:50px;height:50px;border-radius:50%;background:#e7f3dc;color:#3f7049;display:grid;place-items:center;font:800 17px Manrope}.profile-head b{font-size:13px}.profile-head small{display:block;color:#8a968e;font-size:10px;margin-top:4px}
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@media(max-width:760px){.topbar{height:64px;padding:0 14px;gap:10px}.brand{min-width:0;flex:1;gap:8px}.brand-mark{width:34px;height:34px}.brand-name{font-size:10px}.brand-name small{font-size:7px}.search-wrap{order:5;position:absolute;top:70px;left:14px;right:14px;max-width:none;width:auto;height:38px}.topbar{margin-bottom:50px}.top-actions{gap:7px}.upload-btn{padding:10px 11px}.upload-btn span{display:none}.signin-btn{padding:10px 12px;font-size:10px}.mobile-menu{display:block;border:0;background:transparent;font-size:20px;color:#435b4e}.sidebar{top:64px;transform:translateX(-105%);transition:.2s;box-shadow:10px 0 30px #0001}.sidebar.open{transform:translateX(0)}.main-content{margin-left:0;padding:14px 15px 0}.hero{min-height:300px;padding:30px 25px}.hero-art{right:-120px;opacity:.35}.hero-copy{max-width:330px}.hero h1{font-size:39px}.hero p{font-size:12px}.welcome-strip{align-items:flex-start;gap:10px;flex-direction:column}.strip-tag{padding-left:16px}.section-heading h2{font-size:20px}.video-grid{grid-template-columns:1fr;gap:12px}.thumb{aspect-ratio:16/8}.video-meta{padding:9px 2px}.video-info h3{font-size:12px}.watch-layout{grid-template-columns:1fr}.related{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.related h3{grid-column:1/-1}.watch-player{border-radius:10px}.modal{padding:25px 20px}.footer-brand{display:none}footer{font-size:8px}}