:root{color-scheme:light;--bg: #eef8ff;--surface: #ffffff;--surface-soft: #f4f9ff;--line: #d9e8f7;--text: #15223b;--muted: #64748b;--primary: #347ff6;--primary-strong: #1f55c8;--success: #22c55e;--warning: #ffbd00;--orange: #ff9500;--danger: #f43f4b;--shadow: 0 18px 42px rgba(57, 109, 160, .14)}*{box-sizing:border-box}html,body,#root{min-height:100%;margin:0}body{font-family:Inter,PingFang SC,Microsoft YaHei,system-ui,-apple-system,BlinkMacSystemFont,sans-serif;color:var(--text);background:var(--bg)}button,input,select,textarea{font:inherit}button,a{-webkit-tap-highlight-color:transparent}a{color:inherit;text-decoration:none}input,select,textarea{width:100%;border:1px solid var(--line);border-radius:8px;outline:none;background:#fff;color:var(--text);transition:border-color .16s ease,box-shadow .16s ease}input{height:48px;padding:0 14px}select{height:48px;padding:0 38px 0 14px}textarea{min-height:116px;padding:12px 14px;resize:vertical}input:focus,select:focus,textarea:focus{border-color:#347ff6b8;box-shadow:0 0 0 4px #347ff61f}@keyframes spin{to{transform:rotate(360deg)}}.app-shell{min-height:100vh;background:linear-gradient(180deg,#e8f5fffa,#eff9fff5),radial-gradient(circle at 11% 8%,rgba(52,127,246,.16),transparent 34vw),radial-gradient(circle at 84% 4%,rgba(34,197,94,.12),transparent 26vw),radial-gradient(circle at 50% 100%,rgba(255,189,0,.13),transparent 34vw)}.work-page,.teacher-page,.admin-page{min-height:100vh}.entry-page,.admin-login{min-height:100vh;display:grid;grid-template-columns:minmax(0,1.2fr) minmax(360px,480px);gap:48px;align-items:center;padding:6vh 7vw}.top-bar{position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;gap:20px;min-height:82px;padding:18px 28px;border-bottom:1px solid rgba(206,226,243,.92);background:#e2f2ffe0;box-shadow:0 8px 22px #4678aa14;-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px)}.top-bar h1{margin:0;font-size:clamp(24px,3vw,36px);line-height:1.1;color:#1f4fbd;font-weight:950}.top-bar p{margin:6px 0 0;color:var(--muted);font-weight:700}.top-actions{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:10px}.section-title,.section-line{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-bottom:18px}.section-title h2,.section-line strong{margin:0;font-size:24px}.work-grid,.teacher-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:18px;padding:28px}.loading-page{min-height:100vh;display:grid;place-items:center;align-content:center;gap:14px;color:var(--muted);font-weight:900}.primary-btn,.ghost-btn,.icon-btn,.vote-btn,.switch-pill,.identity-chip{min-height:40px;border:1px solid transparent;border-radius:8px;display:inline-flex;align-items:center;justify-content:center;gap:8px;cursor:pointer;font-weight:800;white-space:nowrap}.primary-btn{padding:0 18px;color:#fff;border-color:#347ff63d;background:linear-gradient(180deg,#3f86ff,#2f72ed);box-shadow:0 10px 18px #2f72ed38}.primary-btn:hover{background:linear-gradient(180deg,#4a91ff,#2869e0)}.primary-btn:disabled,.ghost-btn:disabled,.icon-btn:disabled,.switch-pill:disabled{opacity:.5;cursor:not-allowed}.ghost-btn{padding:0 14px;color:#2453b6;border-color:#cfe0f2;background:#ffffffeb;box-shadow:0 8px 16px #4678aa14}.ghost-btn:hover,.icon-btn:hover{border-color:#c2cfdf;background:#f8fafc}.identity-chip{padding:0 14px;color:#1f4fbd;border-color:#cfe0f2;background:#fff;cursor:default}.danger{color:var(--danger)!important}.icon-btn{width:40px;height:40px;padding:0;color:var(--muted);border-color:var(--line);background:#fff}.work-card,.teacher-card,.metric-card,.tenant-card{border:1px solid rgba(216,231,246,.92);border-radius:8px;background:#fff;box-shadow:0 16px 34px #41709d21}.media-box,.media-empty{width:100%;aspect-ratio:var(--work-aspect, 4 / 3);border:2px solid #d9e6f5;border-radius:8px;overflow:hidden;background:linear-gradient(180deg,#f7fbff,#eef6ff);color:var(--muted);display:grid;place-items:center;position:relative;cursor:pointer}.media-box img,.media-box video{width:100%;height:100%;object-fit:cover}.media-box.dark{color:#fff;background:linear-gradient(135deg,#1d4ed8,#00a6d6)}.media-empty{gap:8px;font-weight:800}.media-chip{position:absolute;left:10px;bottom:10px;min-height:28px;padding:0 10px;border-radius:999px;background:#1f4fbddb;color:#fff;display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:800}.text-preview,.file-preview{padding:16px;text-align:left;place-items:start;align-content:start;gap:10px}.text-preview span{line-height:1.6;color:var(--text);overflow:hidden}.file-preview strong{font-size:24px}.metric-card{min-height:110px;padding:18px;display:flex;align-items:center;gap:14px}.metric-card>span{width:46px;height:46px;border-radius:8px;display:grid;place-items:center;color:#fff;background:linear-gradient(135deg,#347ff6,#00a6d6)}.metric-card svg{width:22px;height:22px}.metric-card strong{display:block;font-size:30px;line-height:1}.metric-card small{display:block;margin-top:8px;color:var(--muted);font-weight:800}.modal-backdrop,.drawer-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;z-index:100;background:#0f172a94;display:grid;place-items:center;padding:20px}.preview-modal{width:min(1040px,96vw);max-height:92vh;overflow:hidden;border-radius:8px;background:#fff;box-shadow:var(--shadow)}.preview-modal header{min-height:64px;padding:0 18px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.preview-modal header span{display:block;color:var(--muted);font-size:12px;font-weight:900}.preview-stage{height:min(72vh,720px);display:grid;place-items:center;background:#0f172a;overflow:hidden}.preview-stage img,.preview-stage video,.preview-stage model-viewer{width:100%;height:100%;object-fit:contain}.transform-view{width:100%;height:100%;min-height:0;display:grid;grid-template-rows:auto minmax(0,1fr);background:#0f172a}.preview-tools{min-height:52px;padding:8px;display:flex;align-items:center;justify-content:center;gap:8px;border-bottom:1px solid rgba(255,255,255,.1);background:#0f172af0}.preview-tools .icon-btn,.preview-tools .ghost-btn{min-height:36px;height:36px}.preview-tools .ghost-btn{color:#fff;border-color:#ffffff2e;background:#ffffff1a}.preview-tools .drawing-toolbar{min-height:36px;padding:0 0 0 8px;border:0;border-left:1px solid rgba(255,255,255,.18);border-radius:0;background:transparent}.preview-tools .drawing-width{color:#cbd5e1}.preview-tools .drawing-color{border-color:#ffffff38;background:#ffffff1a}.transform-canvas{width:100%;height:100%;min-height:0;overflow:hidden;display:grid;place-items:center;touch-action:none;cursor:grab}.transform-canvas:active{cursor:grabbing}.preview-stage .transform-canvas img,.compare-stage .transform-canvas img{width:100%;height:100%;object-fit:contain;-webkit-user-select:none;user-select:none;transform-origin:center center;will-change:transform}.transform-view.compact .preview-tools{min-height:44px;justify-content:flex-start}.transform-view.compact .preview-tools .icon-btn{width:34px;height:34px;min-height:34px}.transform-view.compact .preview-tools .ghost-btn{min-height:34px;height:34px;padding:0 10px}.preview-stage article{width:min(760px,90%);max-height:86%;overflow:auto;padding:26px;border-radius:8px;background:#fff;color:var(--text);line-height:1.8;white-space:pre-wrap}.file-open{width:min(420px,90%);min-height:260px;padding:30px;border-radius:8px;background:#fff;color:var(--text);display:grid;place-items:center;align-content:center;gap:18px}.compare-backdrop{padding:14px}.compare-modal{width:min(1480px,98vw);height:min(900px,94vh);overflow:hidden;border-radius:8px;background:#fff;box-shadow:var(--shadow);display:grid;grid-template-rows:auto minmax(0,1fr)}.compare-modal>header{min-height:64px;padding:0 18px;display:flex;align-items:center;justify-content:space-between;gap:14px;border-bottom:1px solid var(--line)}.compare-modal>header strong,.compare-tile header strong{display:block}.compare-modal>header span,.compare-tile header span{color:var(--muted);font-size:12px;font-weight:900}.modal-header-actions,.drawing-toolbar,.drawing-width{display:flex;align-items:center}.modal-header-actions{min-width:0;justify-content:flex-end;gap:10px}.modal-header-actions.single-action{justify-content:flex-end}.drawing-toolbar{min-height:44px;padding:4px;gap:6px;border:1px solid var(--line);border-radius:8px;background:var(--surface-soft)}.drawing-toolbar .icon-btn{width:34px;height:34px;min-height:34px}.drawing-toolbar .icon-btn.active{border-color:var(--primary);background:var(--primary);color:#fff}.drawing-toolbar .icon-btn:disabled{opacity:.38;cursor:not-allowed}.drawing-color{width:34px;height:34px;padding:3px;border-radius:6px;cursor:pointer}.drawing-width{gap:6px;width:142px;color:var(--muted);font-size:11px;font-weight:900}.drawing-width>span{width:7px;height:7px;flex:0 0 auto;border-radius:50%;background:currentColor}.drawing-width input{width:88px;height:28px;padding:0;border:0;box-shadow:none;accent-color:var(--primary)}.drawing-width output{width:30px;text-align:right}.drawing-stage-host{position:relative}.drawing-canvas{position:absolute;top:0;right:0;bottom:0;left:0;z-index:20;width:100%;height:100%;pointer-events:none;touch-action:none}.drawing-canvas.active{pointer-events:auto;cursor:crosshair}.compare-body{min-height:0;overflow:hidden}.compare-body .compare-grid{width:100%;height:100%}.compare-grid{min-height:0;overflow:auto;padding:14px;display:grid;grid-template-columns:repeat(auto-fit,minmax(360px,1fr));gap:14px;background:#f8fafc}.compare-tile{min-height:420px;border:1px solid var(--line);border-radius:8px;overflow:hidden;background:#fff;display:grid;grid-template-rows:auto minmax(0,1fr)}.compare-tile>header{min-height:52px;padding:10px 12px;display:flex;align-items:center;justify-content:space-between;gap:10px;border-bottom:1px solid var(--line)}.compare-stage{min-height:0;display:grid;place-items:center;overflow:hidden;background:#0f172a}.compare-stage video,.compare-stage model-viewer{width:100%;height:100%;object-fit:contain}.compare-text{width:100%;height:100%;overflow:auto;padding:18px;background:#fff;color:var(--text);line-height:1.7;white-space:pre-wrap}.text-submit-modal{width:min(620px,94vw);border-radius:8px;background:#fff;box-shadow:var(--shadow);display:grid;grid-template-rows:auto minmax(220px,42vh) auto;overflow:hidden}.text-submit-modal header,.text-submit-modal footer{min-height:64px;padding:12px 16px;display:flex;align-items:center;justify-content:space-between;gap:12px;border-bottom:1px solid var(--line)}.text-submit-modal footer{border-top:1px solid var(--line);border-bottom:0}.text-submit-modal footer span{color:var(--muted);font-weight:800}.text-submit-modal textarea{min-height:100%;border:0;border-radius:0;resize:none}.text-submit-modal textarea:focus{box-shadow:none}.settings-drawer{position:fixed;top:0;right:0;width:min(720px,96vw);height:100vh;background:#fff;display:grid;grid-template-rows:auto minmax(0,1fr) auto;box-shadow:var(--shadow)}.settings-drawer>header,.settings-drawer>footer{min-height:76px;padding:16px 20px;display:flex;align-items:center;justify-content:space-between;gap:16px;border-bottom:1px solid var(--line)}.settings-drawer>footer{border-top:1px solid var(--line);border-bottom:0}.settings-drawer h2,.settings-drawer p{margin:0}.settings-drawer p,.settings-drawer footer span{color:var(--muted);font-weight:800}.drawer-body{overflow:auto;padding:18px 20px 28px;display:grid;gap:18px}.form-section{display:grid;gap:14px;padding:16px;border:1px solid var(--line);border-radius:8px;background:#fff}.form-section label{display:grid;gap:8px;color:var(--muted);font-size:13px;font-weight:900}.form-grid.two{display:grid;grid-template-columns:1fr 1fr;gap:12px}.switch-grid,.tenant-switches{display:flex;flex-wrap:wrap;gap:8px}.switch-pill{min-height:36px;padding:0 12px;border-color:var(--line);background:#fff;color:var(--muted)}.switch-pill.on{color:var(--primary-strong);border-color:#2563eb4d;background:#eff6ff}.inline-actions{display:flex;gap:8px}.option-editor{display:grid;gap:8px}.quick-setup{display:grid;grid-template-columns:96px minmax(150px,1fr) 120px minmax(120px,1fr);gap:10px}.import-box{display:grid;grid-template-columns:minmax(0,1fr) 110px;gap:10px;align-items:stretch}.import-box textarea{min-height:82px;resize:vertical}.import-box .ghost-btn{min-height:82px}.option-row{display:grid;grid-template-columns:38px minmax(0,1fr) 48px 40px;align-items:center;gap:8px}.option-row>span{height:38px;border-radius:8px;background:#f8fafc;display:grid;place-items:center;color:var(--muted);font-weight:900}.option-row input{height:38px}.option-row input[type=color]{padding:4px}.setting-choice{display:grid;gap:8px}.setting-choice>span{color:var(--muted);font-size:13px;font-weight:900}.setting-choice>div{display:flex;flex-wrap:wrap;gap:8px}.teacher-vote-btn{width:100%;min-height:42px;margin-top:10px;border:0;border-radius:8px;color:#fff;background:linear-gradient(180deg,color-mix(in srgb,var(--accent) 82%,white),var(--accent));box-shadow:0 10px 18px color-mix(in srgb,var(--accent) 28%,transparent);display:inline-flex;align-items:center;justify-content:center;gap:8px;cursor:pointer;font-weight:900}.entry-qr-modal,.ranking-modal{width:min(760px,94vw);max-height:92vh;overflow:hidden;border-radius:8px;background:#fff;box-shadow:var(--shadow);display:grid;grid-template-rows:auto minmax(0,1fr)}.entry-qr-modal>header,.ranking-modal>header{min-height:64px;padding:0 18px;display:flex;align-items:center;justify-content:space-between;gap:14px;border-bottom:1px solid var(--line)}.ranking-modal>header span{display:block;margin-top:4px;color:var(--muted);font-size:12px;font-weight:900}.entry-qr-modal>section{min-height:0;padding:18px;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;background:#eef8ff}.qr-card{min-width:0;padding:16px;border:1px solid var(--line);border-radius:8px;background:#fff;display:grid;gap:14px;justify-items:center}.qr-card header{width:100%;color:#1f4fbd;font-size:18px}.qr-card img{width:min(240px,100%);aspect-ratio:1}.qr-card footer{width:100%;display:flex;gap:8px}.qr-card footer>*{flex:1}.ranking-list{min-height:0;overflow:auto;padding:14px;display:grid;gap:10px;background:#eef8ff}.ranking-row{min-height:62px;padding:10px 12px;border:1px solid var(--line);border-radius:8px;background:#fff;display:grid;grid-template-columns:46px minmax(0,1fr) 90px 90px 70px;align-items:center;gap:10px;box-shadow:0 10px 22px #41709d14}.ranking-rank{width:38px;height:38px;display:grid;place-items:center;border-radius:999px;color:#fff;background:var(--accent, var(--primary));font-weight:900}.ranking-row strong{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.ranking-row span{color:var(--muted);font-size:13px;font-weight:900}.ranking-row b{color:#1f4fbd;font-size:24px;text-align:right}.toast{position:fixed;left:50%;bottom:24px;z-index:200;transform:translate(-50%,18px);min-height:44px;max-width:min(460px,calc(100vw - 32px));padding:0 18px;border-radius:8px;background:#111827;color:#fff;display:flex;align-items:center;justify-content:center;opacity:0;pointer-events:none;transition:opacity .18s ease,transform .18s ease;font-weight:800}.toast.show{opacity:1;transform:translate(-50%)}.loader{width:42px;height:42px;border-radius:50%;border:4px solid #dbeafe;border-top-color:var(--primary);animation:spin .8s linear infinite}.entry-hero{max-width:760px}.brand-mark{display:inline-flex;align-items:center;gap:10px;min-height:42px;padding:0 16px;border:1px solid var(--line);border-radius:999px;background:#ffffffd1;color:var(--primary-strong);font-weight:800}.entry-hero h1{margin:28px 0 0;font-size:clamp(44px,6vw,86px);line-height:1.02;letter-spacing:0;color:#1f4fbd}.entry-hero p{max-width:620px;margin:24px 0 0;color:var(--muted);font-size:clamp(17px,1.5vw,22px);line-height:1.75}.login-panel{width:100%;padding:34px;border:1px solid var(--line);border-radius:8px;background:#ffffffeb;box-shadow:var(--shadow)}.panel-icon{width:62px;height:62px;display:grid;place-items:center;border-radius:8px;color:#fff;background:linear-gradient(135deg,#347ff6,#22c55e)}.login-panel h2{margin:24px 0;font-size:32px}.input-line{display:grid;gap:12px}.student-select{padding:28px}.group-picker{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:12px}.group-choice{height:82px;padding:12px;border:1px solid rgba(216,231,246,.92);border-radius:8px;background:#fff;color:var(--text);cursor:pointer;text-align:left;box-shadow:0 12px 24px #41709d14}.group-choice span{width:30px;height:30px;display:grid;place-items:center;border-radius:8px;color:#fff;background:var(--accent);font-weight:900}.group-choice strong{display:block;margin-top:10px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.group-choice.active{border-color:var(--accent);box-shadow:0 0 0 4px color-mix(in srgb,var(--accent) 14%,transparent)}.student-dock{margin:22px 28px 0;display:grid;grid-template-columns:minmax(190px,260px) minmax(240px,1fr) auto;gap:14px;align-items:stretch}.my-group-card,.rating-box,.submission-actions{min-height:76px;padding:14px;border:1px solid var(--line);border-radius:8px;background:#fff;display:flex;align-items:center;gap:10px}.my-group-card{flex-direction:column;align-items:flex-start;border-left:5px solid var(--accent)}.my-group-card span{color:var(--muted);font-size:13px;font-weight:800}.my-group-card strong{font-size:24px}.submission-actions{justify-content:flex-start}.rating-box{justify-content:center}.rating-box.rating-inline{min-height:40px;padding:0 6px;border:2px solid #ffbd00;background:#fff8dc;gap:2px;justify-content:flex-end}.star-btn{width:38px;height:38px;border:0;background:transparent;color:#cbd5e1;cursor:pointer}.star-btn.active{color:#f59e0b}.rating-inline .star-btn{width:30px;height:34px}.work-card{padding:12px;transition:transform .16s ease,box-shadow .16s ease}.work-card:hover,.teacher-card:hover{transform:translateY(-2px)}.work-card.mine{border-color:var(--accent);box-shadow:0 0 0 4px color-mix(in srgb,var(--accent) 16%,transparent),0 18px 38px #41709d29}.work-meta{display:flex;align-items:center;justify-content:space-between;gap:12px;padding-top:12px}.work-meta span{display:block;color:#4f6b8b;font-size:12px;font-weight:800}.work-meta strong{display:block;max-width:138px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.vote-btn{min-width:82px;padding:0 12px;color:#fff;border-color:transparent;background:linear-gradient(180deg,color-mix(in srgb,var(--accent) 86%,white),var(--accent));box-shadow:0 10px 18px color-mix(in srgb,var(--accent) 28%,transparent)}.teacher-dashboard{display:grid;grid-template-columns:repeat(4,minmax(160px,1fr));gap:16px;padding:24px 28px 0}.teacher-card{padding:12px}.teacher-card header{min-height:52px;display:grid;grid-template-columns:42px minmax(0,1fr) 40px;align-items:center;gap:10px;margin-bottom:12px}.teacher-card.selectable{border-color:color-mix(in srgb,var(--accent) 38%,var(--line))}.teacher-card.selectable header{grid-template-columns:42px minmax(0,1fr) 40px 40px}.teacher-card.selected{box-shadow:0 0 0 4px color-mix(in srgb,var(--accent) 18%,transparent)}.select-toggle.on{color:#fff;border-color:var(--accent);background:var(--accent)}.rank{width:38px;height:38px;display:grid;place-items:center;border-radius:8px;color:#fff;background:linear-gradient(180deg,color-mix(in srgb,var(--accent) 86%,white),var(--accent));font-weight:900}.teacher-card header strong{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.teacher-card header small{color:var(--muted);font-weight:800}.teacher-media-frame{position:relative}.teacher-stat-stack{position:absolute;left:10px;bottom:10px;display:flex;flex-wrap:wrap;gap:6px;max-width:calc(100% - 20px);pointer-events:none}.teacher-stat-pill,.teacher-total-pill{min-height:28px;padding:0 9px;border-radius:999px;display:inline-flex;align-items:center;color:#fff;font-size:12px;font-weight:900;box-shadow:0 8px 18px #0f172a2e}.teacher-stat-pill.peer{background:#2f7df6f0}.teacher-stat-pill.teacher{background:#16a34af0}.teacher-stat-pill.self{background:#7c3aedf0}.teacher-total-pill{position:absolute;top:10px;right:10px;background:#ff9500f2;pointer-events:none}.teacher-card-actions{margin-top:10px}.admin-page{padding-bottom:28px}.tenant-create{display:grid;grid-template-columns:minmax(180px,1fr) minmax(180px,1fr) 120px 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