:root{--bg: #070b1a;--bg-soft: #0c1226;--panel: rgba(148, 163, 255, .06);--panel-strong: rgba(148, 163, 255, .1);--line: rgba(148, 163, 255, .16);--line-strong: rgba(148, 163, 255, .3);--text: #eef1ff;--text-dim: #9aa3c7;--neon-a: #7c6bff;--neon-b: #22d3ee;--neon-c: #f472b6;--ok: #34d399;--warn: #fbbf24;--danger: #fb7185;--grad: linear-gradient(120deg, var(--neon-a), var(--neon-b) 55%, var(--neon-c));--radius: 16px;--radius-lg: 22px;--shadow: 0 10px 40px rgba(3, 6, 20, .55);font-size:16px}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;background:var(--bg);color:var(--text);font-family:PingFang SC,Microsoft YaHei,Noto Sans 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scale(1.12)}}@media (prefers-reduced-motion: reduce){.nebula{animation:none}}.app-shell{position:relative;z-index:1;min-height:100%;display:flex;flex-direction:column}.topbar{position:sticky;top:0;z-index:50;display:flex;align-items:center;gap:18px;padding:14px 28px;background:#070b1ab8;-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:1.12rem;letter-spacing:.5px;flex:none}.brand .logo{width:36px;height:36px;border-radius:10px;display:block;object-fit:cover;box-shadow:0 0 18px #3884ff73;flex:none}.brand .sub{font-size:.72rem;color:var(--text-dim);font-weight:400;display:block;letter-spacing:2px}.nav{display:flex;gap:6px;margin-left:12px;flex-wrap:nowrap;min-width:0}.nav a{padding:9px 16px;border-radius:999px;color:var(--text-dim);font-size:.95rem;border:1px solid transparent;transition:all .18s;white-space:nowrap;flex:none}.nav 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14px;border-radius:999px;background:var(--panel);border:1px solid var(--line);color:var(--text);font-size:.9rem;cursor:pointer}.account-trigger:hover,.account-menu.open .account-trigger{border-color:var(--line-strong)}.account-trigger-name{max-width:7em;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:600}.account-caret{color:var(--text-dim);font-size:.75rem}.account-dropdown{position:absolute;right:0;top:calc(100% + 8px);z-index:60;min-width:220px;padding:8px;background:#0c1224f5;border:1px solid var(--line);border-radius:14px;box-shadow:0 12px 40px #00000073;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.account-meta{padding:10px 12px 12px;margin-bottom:4px;border-bottom:1px solid var(--line)}.account-meta-name{font-weight:600;color:var(--text);margin-bottom:4px}.account-quota{margin-top:8px;font-size:.88rem;color:var(--neon-b)}.account-item{display:block;width:100%;text-align:left;padding:10px 12px;border:0;border-radius:10px;background:transparent;color:var(--text);font-size:.92rem;cursor:pointer;text-decoration:none}.account-item:hover{background:var(--panel)}.account-item.danger{color:var(--danger)}.nav-measure{position:absolute;visibility:hidden;pointer-events:none;display:flex;gap:6px;white-space:nowrap;left:0;top:0}.nav-measure span{padding:9px 16px;font-size:.95rem}.topbar-start{display:flex;align-items:center;gap:10px;flex:none;min-width:0}.nav-menu{position:relative;flex:none}.nav-toggle{display:inline-flex;align-items:center;gap:8px;min-height:44px;padding:4px 10px 4px 6px;border-radius:14px;border:1px solid transparent;background:transparent;color:inherit;font:inherit;cursor:pointer;text-align:left}.nav-toggle:hover,.nav-menu.open .nav-toggle{border-color:var(--line);background:var(--panel)}.nav-toggle-icon{flex:none;width:28px;text-align:center;font-size:1.15rem;color:var(--text-dim)}.nav-toggle .brand{pointer-events:none}.nav-dropdown{position:absolute;left:0;top:calc(100% + 8px);z-index:60;min-width:200px;padding:8px;display:flex;flex-direction:column;gap:2px;background:#0c1224f5;border:1px solid var(--line);border-radius:14px;box-shadow:0 12px 40px #00000073;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.nav-dropdown-item{display:flex;align-items:center;min-height:44px;padding:10px 14px;border-radius:10px;color:var(--text-dim);font-size:.95rem;text-decoration:none;white-space:nowrap}.nav-dropdown-item:hover{color:var(--text);background:var(--panel)}.nav-dropdown-item.active{color:#fff;background:linear-gradient(120deg,#7c6bff38,#22d3ee24);border:1px solid var(--line-strong)}.page{width:min(1180px,calc(100% - 48px));margin:0 auto;padding:30px 0 80px;flex:1}.page-head{margin:6px 0 24px}.page-head h1{margin:0 0 6px;font-size:1.7rem;letter-spacing:1px}.page-head 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var(--line);cursor:zoom-in}.gen-tags{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-top:10px}.gen-tag{display:inline-flex;align-items:center;gap:2px;padding:2px 4px 2px 10px;border-radius:999px;background:#7c6bff29;border:1px solid rgba(124,107,255,.38);color:var(--text);font-size:.8rem}.gen-tag-name{border:0;background:transparent;color:inherit;font:inherit;padding:0;cursor:pointer}.gen-tag-x{border:0;background:transparent;color:var(--text-dim);cursor:pointer;font-size:1rem;line-height:1;padding:0 6px}.gen-tag-x:hover:not(:disabled){color:var(--danger)}.gen-tag-add{display:inline-flex;align-items:center;gap:6px}.gen-tag-add .input{width:108px;min-width:108px;height:30px;padding:0 10px;font-size:.8rem}.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius)}.courseware-list{display:flex;flex-direction:column;gap:12px}.courseware-item{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:16px 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768px){.courseware-item{flex-direction:column;align-items:stretch}.courseware-item-actions{justify-content:flex-start}}.cw-player{position:fixed;top:0;right:0;bottom:0;left:0;z-index:280;background:#060814f5;display:flex;flex-direction:column;color:var(--text)}.cw-player-bar{display:flex;align-items:center;gap:16px;padding:12px 18px;border-bottom:1px solid var(--line);flex-shrink:0}.cw-player-title{font-weight:650;flex:1;min-width:0;word-break:break-word}.cw-player-empty{flex:1;display:grid;place-items:center;color:var(--text-dim);padding:24px}.cw-player-body{flex:1;min-height:0;display:flex}.cw-slide-nav{width:220px;flex-shrink:0;overflow:auto;border-right:1px solid var(--line);padding:10px;display:flex;flex-direction:column;gap:8px}.cw-slide-nav-item{display:grid;grid-template-columns:28px 64px 1fr;gap:8px;align-items:center;text-align:left;padding:6px;border-radius:10px;border:1px solid transparent;background:transparent;color:inherit;cursor:pointer}.cw-slide-nav-item img{width:64px;height:40px;object-fit:cover;border-radius:6px;background:#0b1020}.cw-slide-nav-idx{font-size:.78rem;color:var(--text-dim);text-align:center}.cw-slide-nav-title{font-size:.78rem;line-height:1.3;color:var(--text-dim);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.cw-slide-nav-item.on{border-color:var(--neon-b);background:#22d3ee14}.cw-slide-stage{flex:1;min-width:0;position:relative;display:grid;place-items:center;padding:18px;background:#05070f}.cw-slide-stage img{max-width:100%;max-height:100%;object-fit:contain;border-radius:8px;box-shadow:0 12px 40px #00000073}.cw-slide-hint,.cw-full-hint{position:absolute;left:50%;transform:translate(-50%);background:#080a18bf;border:1px solid var(--line);padding:6px 12px;border-radius:999px;font-size:.82rem;color:var(--text-dim)}.cw-slide-hint{bottom:24px}.cw-full-hint{top:18px}.cw-player.is-full .cw-player-bar{position:absolute;left:0;right:0;top:0;z-index:2;background:#060814d1}.cw-player.is-full.chrome-off .cw-player-bar{opacity:0;pointer-events:none}.cw-player.is-full .cw-player-body,.cw-player.is-full .cw-slide-stage{padding:0;background:#000}.cw-player.is-full .cw-slide-stage{cursor:pointer}.cw-player.is-full.chrome-off{cursor:none}@media (max-width: 768px){.cw-player-body{flex-direction:column}.cw-slide-nav{width:100%;max-height:140px;flex-direction:row;border-right:0;border-bottom:1px solid var(--line)}.cw-slide-nav-item{min-width:160px}}table.tbl{width:100%;border-collapse:collapse;font-size:.94rem}.tbl th,.tbl td{padding:12px 16px;text-align:left;border-bottom:1px solid var(--line);vertical-align:middle}.tbl td .row{flex-wrap:nowrap}.tbl th{color:var(--text-dim);font-weight:500;font-size:.86rem;background:#94a3ff0d;white-space:nowrap}.tbl tr:last-child td{border-bottom:none}.tbl tbody tr:hover{background:#94a3ff0d}.tag{display:inline-block;padding:3px 10px;border-radius:999px;font-size:.78rem;border:1px solid var(--line-strong);color:var(--text-dim)}.tag.ok{color:var(--ok);border-color:#34d39973;background:#34d39914}.tag.warn{color:var(--warn);border-color:#fbbf2473;background:#fbbf2414}.tag.bad{color:var(--danger);border-color:#fb718573;background:#fb718514}.tag.neon{color:var(--neon-b);border-color:#22d3ee73;background:#22d3ee14}.modal-mask{position:fixed;top:0;right:0;bottom:0;left:0;z-index:100;display:grid;place-items:center;background:#040610b8;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);padding:20px}.modal{width:min(560px,100%);max-height:86vh;overflow:auto;background:var(--bg-soft);border:1px solid var(--line-strong);border-radius:var(--radius-lg);padding:26px;box-shadow:0 30px 90px #0009}.modal.wide{width:min(860px,100%)}.modal.full{width:min(1200px,calc(100vw - 32px));max-height:92vh}.modal h2{margin:0 0 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