:root{--primary:#4361ee;--primary-dark:#3a53cc;--bg:#f4f6fb;--surface:#fff;--text:#1e2433;--text-soft:#5c6577;--border:#e3e7f0;--success:#16a34a;--danger:#dc2626;--warning:#d97706;--radius:12px}*{box-sizing:border-box;margin:0;padding:0}body{background:var(--bg);color:var(--text);min-height:100vh;font-family:Segoe UI,system-ui,-apple-system,sans-serif}button{font-family:inherit}.btn{background:var(--primary);color:#fff;cursor:pointer;border:none;border-radius:8px;justify-content:center;align-items:center;gap:8px;padding:10px 20px;font-size:15px;font-weight:600;transition:background .15s;display:inline-flex}.btn:hover{background:var(--primary-dark)}.btn:disabled{cursor:not-allowed;background:#a5b0c8}.btn-danger{background:var(--danger)}.btn-danger:hover{background:#b91c1c}.btn-ghost{color:var(--text-soft);border:1px solid var(--border);background:0 0}.btn-ghost:hover{background:var(--bg)}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px}.input{border:1px solid var(--border);background:var(--surface);width:100%;color:var(--text);border-radius:8px;padding:11px 14px;font-family:inherit;font-size:15px}.input:focus{outline:2px solid var(--primary);outline-offset:-1px;border-color:#0000}.badge{border-radius:999px;padding:3px 10px;font-size:12px;font-weight:700;display:inline-block}.badge-approved{color:var(--success);background:#dcfce7}.badge-pending{color:var(--warning);background:#fef3c7}.badge-rejected{color:var(--danger);background:#fee2e2}.error-text{color:var(--danger);font-size:14px}.login-wrap{justify-content:center;align-items:center;min-height:100vh;padding:16px;display:flex}.login-card{flex-direction:column;gap:14px;width:100%;max-width:400px;display:flex}.login-logo{text-align:center;margin-bottom:8px}.login-logo h1{color:var(--primary);letter-spacing:-.5px;font-size:26px}.login-logo p{color:var(--text-soft);margin-top:4px;font-size:14px}.topbar{background:var(--surface);border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;height:60px;padding:0 24px;display:flex}.topbar .brand{color:var(--primary);font-size:19px;font-weight:800;text-decoration:none}.topbar .user-area{color:var(--text-soft);align-items:center;gap:14px;font-size:14px;display:flex}.page{max-width:860px;margin:0 auto;padding:28px 16px}.page h2{margin-bottom:18px;font-size:21px}.lesson-list{flex-direction:column;gap:12px;display:flex}.lesson-card{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;display:flex}.lesson-card .info{flex:1;min-width:220px}.lesson-card .title{font-size:16px;font-weight:700}.lesson-card .sub{color:var(--text-soft);margin-top:3px;font-size:14px}.empty-note{text-align:center;color:var(--text-soft);padding:40px 16px}.room{background:#0f1117;height:100vh;display:flex}.room-video{flex-direction:column;gap:12px;width:340px;min-width:280px;padding:12px;display:flex}.video-box{background:#1a1e29;border-radius:10px;flex:1;min-height:140px;position:relative;overflow:hidden}.video-box .label{z-index:5;color:#fff;background:#00000073;border-radius:6px;padding:3px 9px;font-size:12px;font-weight:600;position:absolute;bottom:8px;left:10px}.video-box .placeholder{color:#5c6577;justify-content:center;align-items:center;font-size:14px;display:flex;position:absolute;inset:0}.video-el{width:100%;height:100%}.room-controls{justify-content:center;gap:10px;display:flex}.ctrl-btn{cursor:pointer;color:#fff;background:#ffffff1f;border:none;border-radius:50%;justify-content:center;align-items:center;width:46px;height:46px;font-size:19px;display:flex}.ctrl-btn.off,.ctrl-btn.leave{background:var(--danger)}.room-board{flex:1}.room-board iframe{border:none;width:100%;height:100%}.room-status{color:#8b93a5;text-align:center;font-size:13px}@media (width<=800px){.room{flex-direction:column}.room-video{flex-direction:row;align-items:stretch;width:100%;height:170px}.video-box{flex:1}.room-controls{flex-direction:column;justify-content:center}}.stream-tabs{flex-wrap:wrap;gap:8px;margin-bottom:20px;display:flex}.stream-grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:18px;display:grid}.stream-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);cursor:pointer;transition:transform .15s,box-shadow .15s;overflow:hidden}.stream-card:hover{transform:translateY(-2px);box-shadow:0 6px 18px #1e243314}.stream-thumb{aspect-ratio:16/9;background:#1a1e29;position:relative}.stream-thumb img{object-fit:cover;width:100%;height:100%}.stream-thumb-placeholder{justify-content:center;align-items:center;width:100%;height:100%;font-size:32px;display:flex}.stream-badge{color:#fff;border-radius:6px;padding:3px 9px;font-size:11px;font-weight:700;position:absolute;top:8px;left:8px}.stream-badge.live{background:var(--danger)}.stream-badge.upcoming{background:var(--warning)}.stream-badge.locked{background:#0000008c;left:auto;right:8px}.stream-info{padding:12px 14px}.stream-title{text-overflow:ellipsis;white-space:nowrap;font-size:14px;font-weight:700;overflow:hidden}.stream-sub{color:var(--text-soft);margin-top:3px;font-size:13px}.watch-layout{background:#0f1117;height:100vh;display:flex}.watch-video-col{flex-direction:column;flex:1;min-width:0;display:flex}.watch-video-box{aspect-ratio:16/9;background:#000;max-height:80vh;position:relative}.watch-video-el{width:100%;height:100%}.watch-live-badge{position:absolute;top:12px;left:12px}.watch-info{background:var(--surface);color:var(--text);padding:18px 24px;overflow-y:auto}.watch-paywall{background:#111;width:100%;height:100%;position:relative;overflow:hidden}.watch-paywall-bg{object-fit:cover;opacity:.35;filter:blur(2px);width:100%;height:100%;position:absolute;inset:0}.watch-paywall-overlay{z-index:1;text-align:center;color:#fff;flex-direction:column;justify-content:center;align-items:center;height:100%;padding:32px;display:flex;position:relative}.watch-paywall-icon{margin-bottom:14px;font-size:40px}.watch-paywall-overlay h3{margin-bottom:8px;font-size:20px}.watch-paywall-overlay p{color:#fff9;max-width:340px;font-size:14px}.watch-chat-col{background:#171a23;border-left:1px solid #ffffff14;flex-direction:column;width:340px;min-width:280px;display:flex}.watch-chat-messages{flex:1;padding:14px;overflow-y:auto}.chat-msg{flex-direction:column;margin-bottom:10px;display:flex}.chat-msg.me{align-items:flex-end}.chat-author{color:#ffffff73;margin-bottom:2px;font-size:11px}.chat-bubble{color:#fff;background:#2a2f3d;border-radius:12px;max-width:85%;padding:7px 11px;font-size:13px;display:inline-block}.chat-msg.me .chat-bubble{background:var(--primary)}.watch-chat-input{border-top:1px solid #ffffff14;gap:8px;padding:12px;display:flex}.watch-chat-input .input{color:#fff;background:#20242f;border-color:#2f3547}@media (width<=900px){.watch-layout{flex-direction:column;height:auto;min-height:100vh}.watch-video-box{max-height:none}.watch-chat-col{width:100%;min-width:0;height:420px}}