:root{font-family:Segoe UI,"Microsoft YaHei",sans-serif;color:#172033;background:#f5f7fb;--panel:#fff;--line:#e5e9f1;--muted:#738096;--blue:#3867e8;--blue2:#edf2ff}*{box-sizing:border-box}body{margin:0;background:radial-gradient(circle at 100% 0,#e9efff 0,transparent 32%),#f5f7fb}body.dark{color:#e8edf7;background:#101522;--panel:#171e2d;--line:#2a3448;--muted:#98a5ba;--blue2:#1b2b55}.topbar{height:72px;background:var(--panel);border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 30px}.brand{display:flex;align-items:center;gap:11px}.brand-mark{background:#1b2b55;color:#fff;font-weight:800;padding:9px 8px;border-radius:9px;font-size:13px}.brand strong{display:block;font-size:16px}.brand small{display:block;color:var(--muted);font-size:11px;margin-top:2px}.top-actions{display:flex;gap:10px}.layout{display:grid;grid-template-columns:260px minmax(0,1fr);min-height:calc(100vh - 72px)}.sidebar{border-right:1px solid var(--line);padding:24px 18px;background:color-mix(in srgb,var(--panel) 82%,transparent)}.license,.side-section{padding:16px;border:1px solid var(--line);background:var(--panel);border-radius:12px;margin-bottom:16px}.eyebrow{color:var(--muted);font-size:11px;letter-spacing:.08em;text-transform:uppercase}.license-row{display:flex;align-items:center;gap:8px;margin:10px 0 4px}.dot{width:8px;height:8px;border-radius:50%;background:#29b37e}.expiry{color:var(--muted);font-size:12px}.section-title,.section-heading,.workspace-head,.composer-actions,.dialog-head,.dialog-actions,.license-row{display:flex;align-items:center;justify-content:space-between}.section-title{font-weight:700;margin-bottom:12px}.mini,.icon-btn{border:0;background:transparent;color:var(--muted);cursor:pointer;font-size:18px}.group{padding:10px;border-radius:8px;color:var(--muted);cursor:pointer}.group.active{background:var(--blue2);color:var(--blue);font-weight:700}.primary,.secondary{border:0;border-radius:8px;padding:10px 15px;cursor:pointer;font-weight:700}.primary{background:var(--blue);color:#fff}.secondary{background:var(--blue2);color:var(--blue)}.full{width:100%;margin-top:8px}.help p{color:var(--muted);font-size:12px;line-height:1.6}.workspace{max-width:1100px;width:100%;margin:0 auto;padding:32px 42px}.workspace-head{margin-bottom:24px}.workspace-head h1,.section-heading h2{margin:5px 0 0;font-size:25px}.section-heading h2{font-size:18px}.head-meta{display:flex;gap:18px;color:var(--muted);font-size:12px}.panel{background:var(--panel);border:1px solid var(--line);border-radius:14px}.composer{padding:22px;margin-bottom:34px}.composer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:14px}label{display:flex;flex-direction:column;gap:7px;color:var(--muted);font-size:12px}select,input,textarea{font:inherit;border:1px solid var(--line);border-radius:8px;background:var(--panel);color:inherit;padding:10px;outline:none}textarea{resize:vertical}.prompt-label{margin-top:17px}.composer-actions{margin-top:16px}.composer-actions span{font-size:12px;color:var(--muted)}.video-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px;margin-top:16px}.video-card{background:var(--panel);border:1px solid var(--line);border-radius:12px;overflow:hidden}.thumb{height:125px;background:linear-gradient(135deg,#24314f,#5f77b8);display:flex;align-items:flex-end;padding:13px;color:#fff;font-weight:700}.video-body{padding:14px}.video-body h3{font-size:14px;margin:0 0 8px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.video-meta{font-size:11px;color:var(--muted);display:flex;justify-content:space-between}.video-body a{display:inline-block;margin-top:12px;font-size:12px;color:var(--blue);text-decoration:none}.empty{grid-column:1/-1;text-align:center;padding:48px;color:var(--muted);border:1px dashed var(--line);border-radius:12px}dialog{border:1px solid var(--line);border-radius:14px;background:var(--panel);color:inherit;padding:0;width:360px}dialog::backdrop{background:#10152266}dialog form{padding:20px}dialog h3{margin:0 0 18px}.dialog-head{margin-bottom:18px}.dialog-actions{justify-content:flex-end;gap:10px;margin-top:20px}@media(max-width:760px){.layout{grid-template-columns:1fr}.sidebar{border-right:0;border-bottom:1px solid var(--line)}.workspace{padding:24px 18px}.composer-grid{grid-template-columns:1fr}.topbar{padding:0 18px}}