:root{--bg: #f5f6f8;--panel: #ffffff;--ink: #1c2330;--muted: #667085;--line: #e3e6ec;--brand: #17365d;--brand-ink: #ffffff;--accent: #b8862b;--ok: #1f7a4d;--danger: #b42318;--radius: 10px;font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Microsoft YaHei,Segoe UI,sans-serif;font-size:15px;line-height:1.6;color:var(--ink)}*{box-sizing:border-box}body{margin:0;background:var(--bg)}a{color:var(--brand);text-decoration:none}h1{font-size:22px;margin:0 0 14px}h1.spaced{margin-top:36px}h2{font-size:16px;margin:22px 0 10px}h3{font-size:15px;margin:16px 0 8px}p{margin:6px 0}.muted{color:var(--muted)}.small{font-size:13px}.error{color:var(--danger)}.warn{background:#fff7e6;border:1px solid #f1d39a;padding:8px 12px;border-radius:8px}.empty{color:var(--muted);padding:28px 0;text-align:center}.center-note{padding:80px 16px;text-align:center;color:var(--muted)}button{font:inherit;cursor:pointer}button:disabled{opacity:.5;cursor:not-allowed}.primary{background:var(--brand);color:var(--brand-ink);border:0;border-radius:8px;padding:9px 18px}.ghost{background:transparent;color:var(--brand);border:1px solid var(--line);border-radius:8px;padding:8px 14px}.link{background:none;border:0;color:var(--brand);padding:0}input,textarea{font:inherit;color:inherit;width:100%;padding:9px 11px;border:1px solid var(--line);border-radius:8px;background:#fff}input:focus,textarea:focus,button:focus-visible,a:focus-visible{outline:2px solid var(--accent);outline-offset:1px}label{display:block;margin:12px 0;font-size:14px;color:var(--muted)}label input,label textarea{margin-top:5px;color:var(--ink)}.mono{font-family:Consolas,SF Mono,monospace;font-size:13px}.topbar{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;background:var(--brand);color:var(--brand-ink);padding:10px 20px}.topbar a,.topbar .link{color:var(--brand-ink)}.brand{font-size:19px;font-weight:700;letter-spacing:1px}.brand span{font-size:13px;font-weight:400;opacity:.75;margin-left:8px}.topbar nav{display:flex;gap:18px;flex-wrap:wrap;font-size:14px}.page{max-width:1240px;margin:0 auto;padding:22px 16px 60px}.narrow{max-width:440px;margin:20px auto}.auth-wrap{min-height:100vh;display:grid;place-items:center;padding:16px;background:linear-gradient(160deg,#17365d,#0e2440)}.auth-card{width:100%;max-width:400px;background:var(--panel);border-radius:14px;padding:28px;box-shadow:0 10px 40px #0000002e}.narrow .auth-card{box-shadow:none;border:1px solid var(--line)}.auth-card h1{font-size:26px;color:var(--brand);margin-bottom:0;letter-spacing:2px}.auth-card .primary{width:100%;margin-top:8px;padding:11px}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:14px}.card{display:block;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:16px;color:inherit}a.card:hover{border-color:var(--brand)}.card h3{margin:0 0 4px;font-size:16px}.card.locked{opacity:.65}.card .small{display:flex;justify-content:space-between;gap:8px;flex-wrap:wrap}.card b{color:var(--brand);font-weight:600}.tag{display:inline-block;font-size:12px;color:var(--muted);border:1px solid var(--line);border-radius:20px;padding:1px 10px}.bar{height:6px;background:var(--line);border-radius:3px;overflow:hidden;margin:12px 0 6px}.bar i{display:block;height:100%;background:var(--accent)}.course{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:20px;align-items:start}.crumb{font-size:13px;color:var(--muted);margin:0 0 10px}.video-box{position:relative;background:#000;border-radius:var(--radius);overflow:hidden;aspect-ratio:16 / 9}.video-box video{width:100%;height:100%;display:block}.watermark{position:absolute;pointer-events:none;-webkit-user-select:none;user-select:none;white-space:nowrap;color:#ffffff47;font-size:14px;text-shadow:0 0 2px rgba(0,0,0,.35);transition:top 1.2s,left 1.2s}.speed{display:flex;align-items:center;gap:8px;margin:10px 0 4px;font-size:13px}.chip{background:var(--panel);border:1px solid var(--line);border-radius:20px;padding:2px 12px;color:var(--ink)}.chip.on{background:var(--brand);color:var(--brand-ink);border-color:var(--brand)}.lesson-title{font-size:19px;margin:8px 0 2px}.course-main .ghost{margin-top:10px}.lesson-list{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);max-height:calc(100vh - 110px);overflow:auto;position:sticky;top:12px}.list-head{display:flex;justify-content:space-between;padding:12px 14px;font-weight:600;border-bottom:1px solid var(--line);position:sticky;top:0;background:var(--panel)}.list-head .muted{font-weight:400;font-size:13px}.lesson-list ol{list-style:none;margin:0;padding:0}.chapter{padding:10px 14px 4px;font-size:13px;color:var(--accent);font-weight:600}.lesson{display:grid;grid-template-columns:30px minmax(0,1fr) auto;gap:6px;width:100%;text-align:left;background:none;border:0;border-bottom:1px solid var(--line);padding:9px 14px;color:var(--ink);align-items:baseline}.lesson:hover{background:#f3f5f9}.lesson.on{background:#eaf0f8;font-weight:600}.lesson .no{color:var(--muted);font-size:13px}.lesson .name{overflow-wrap:anywhere}.lesson .state{font-size:12px;color:var(--muted);white-space:nowrap}.lesson .state.done{color:var(--ok)}.admin-head{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:12px}.admin-head h1{margin:0}.admin-head h1 .muted{font-size:14px;font-weight:400;margin-left:10px}.admin-head>div{display:flex;gap:10px}.search{width:220px}.table-wrap{overflow-x:auto;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius)}table{width:100%;border-collapse:collapse;font-size:14px}th,td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--line);vertical-align:top;white-space:nowrap}th{color:var(--muted);font-weight:500;font-size:13px;background:#fafbfc}td.wrap{white-space:normal;min-width:220px;max-width:420px}tr.off td{color:var(--muted)}.ops{display:flex;gap:12px}.modal-back{position:fixed;inset:0;background:#0f172a73;display:grid;place-items:center;padding:16px;z-index:10}.modal{background:var(--panel);border-radius:14px;width:100%;max-width:640px;max-height:90vh;overflow:auto;padding:20px 22px}.modal-head{display:flex;justify-content:space-between;align-items:center}.modal-head h2{margin:0;font-size:17px}.actions{display:flex;justify-content:flex-end;gap:10px;margin-top:16px}.grant-group{border:1px solid var(--line);border-radius:8px;padding:6px 12px;margin-bottom:10px}.grant-row{display:flex;align-items:center;gap:12px;flex-wrap:wrap;padding:4px 0 4px 22px}.grant-row.cat{padding-left:0;font-weight:600}.check{display:flex;align-items:center;gap:8px;margin:0;color:var(--ink);font-size:14px}.check input{width:auto;margin:0}.until{display:flex;align-items:center;gap:6px;margin:0;font-size:13px;font-weight:400}.until input{width:auto;margin:0;padding:3px 6px}@media(max-width:900px){.course{grid-template-columns:1fr}.lesson-list{position:static;max-height:none}.page{padding:14px 12px 50px}.search{width:100%}.admin-head>div{width:100%;flex-wrap:wrap}}