*{box-sizing:border-box} :root{color-scheme:light;--ink:#233f35;--green:#2d6a52;--border:#d9e2d6;--muted:#718075}body{margin:0;background:#f5f6ee;color:var(--ink);font-family:system-ui,-apple-system,"Microsoft YaHei",sans-serif}button,input,select{font:inherit}button,a,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer;border:1px solid var(--border);border-radius:12px;padding:10px 15px;background:#fff;color:var(--ink);font-size:14px;min-height:44px}button:hover:not(:disabled){border-color:#65977b;background:#edf5ed}button:disabled{opacity:.45;cursor:not-allowed}button.primary{background:var(--green);border-color:var(--green);color:white}button.primary:hover:not(:disabled){background:#21543f}button.subtle{background:transparent;color:#7c6959}a{color:inherit;text-decoration:none}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #e1ad47;outline-offset:3px}.page-head,main,footer{max-width:1500px;margin:auto;padding-left:32px;padding-right:32px}.page-head{padding-top:26px;display:flex;justify-content:space-between;align-items:center}.back{font-size:14px;font-weight:650}.eyebrow{font-size:12px;letter-spacing:2px;color:var(--muted)}.heading{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;padding:34px 0 24px}.kicker{font-size:11px;letter-spacing:3px;color:#7d9069}h1{font-size:clamp(26px,3vw,40px);letter-spacing:-1px;margin:9px 0 10px}.heading p{font-size:14px;color:var(--muted);margin:0}.download{display:flex;gap:10px;flex-wrap:wrap}.settings{display:flex;gap:16px;align-items:center;flex-wrap:wrap;background:#fff;border:1px solid var(--border);border-radius:18px;padding:18px 22px;margin-bottom:22px}.settings label{display:flex;flex-direction:column;gap:6px;font-size:12px;color:var(--muted)}select{border:1px solid var(--border);border-radius:9px;background:#fafbf7;color:var(--ink);padding:9px 30px 9px 12px;min-width:88px;min-height:42px}.divider{height:40px;width:1px;background:var(--border);margin:0 4px}.capacity{margin-left:auto;font-size:13px;color:var(--green)}.capacity.warning{color:#a65726}.workspace{display:grid;grid-template-columns:270px minmax(0,1fr);gap:22px;align-items:start}.roster-panel,.plan-panel{background:white;border:1px solid var(--border);border-radius:20px}.roster-panel{position:sticky;top:16px;padding:20px;max-height:calc(100dvh - 32px);overflow:auto;scrollbar-width:thin}.panel-heading{display:flex;align-items:center;justify-content:space-between}h2{font-size:18px;margin:0}.count{padding:4px 10px;border-radius:20px;background:#eef3e8;color:#647b4e;font-size:12px}.search-label input{width:100%;margin-top:16px;border:1px solid var(--border);border-radius:10px;padding:11px 12px;font-size:14px;background:#fafbf8;min-width:0}.hint{font-size:12px;color:var(--muted);line-height:1.8;margin:12px 0 16px}.student-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}.name-tile{background:#f3f6e9;border:1px solid #dbe4ca;border-radius:10px;min-height:48px;padding:8px 3px;font-size:15px;font-weight:600;cursor:grab;touch-action:none;user-select:none;-webkit-user-select:none;overflow-wrap:anywhere}.name-tile:hover{background:#e8efd9!important}.name-tile.selected,.seat.selected{outline:3px solid #dfa940;outline-offset:1px;background:#fff7da!important}.name-tile.drag-source,.seat.drag-source{opacity:.35}.empty-pool{grid-column:1/-1;text-align:center;color:var(--muted);font-size:14px;padding:24px 0;line-height:1.8}.return-student{margin-top:12px;width:100%;font-size:12px;border-style:dashed;background:#fffaf0}.plan-panel{padding:24px}.plan-bar{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:24px}.plan-bar p{font-size:12px;color:var(--muted);margin:7px 0 0}.plan-actions{display:flex;gap:7px;flex-wrap:wrap}.plan-actions button{padding:8px 12px;font-size:12px}.board{text-align:center;background:#eaf0e6;border:1px solid #dbe4d4;color:#5f7755;border-radius:12px;padding:13px 20px;margin:0 auto 24px;max-width:460px}.board span{font-size:16px;font-weight:650;letter-spacing:4px}.board small{display:block;font-size:11px;margin-top:5px;color:#819078}.groups-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.group{border:1px solid var(--border);border-radius:14px;padding:14px;background:#fcfdf9;min-width:0}.group:nth-child(3n+2){background:#f8fbfd}.group:nth-child(3n){background:#fffdf6}.group-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}.group h3{font-size:14px;margin:0;font-weight:700}.group-head span{font-size:11px;color:var(--muted)}.seat-grid{display:grid;grid-template-columns:repeat(var(--cols),minmax(0,1fr));gap:7px}.seat{border:1px dashed #c9d8c6;border-radius:9px;min-height:52px;padding:8px 2px;font-size:15px;color:#94a18e;background:#fff;overflow-wrap:anywhere;min-width:0}.seat.occupied{border:1px solid #bfd1bb;background:#eaf1e2;color:#284833;font-weight:650;cursor:grab;touch-action:none;user-select:none;-webkit-user-select:none}.seat:hover{border-color:var(--green)}.seat .seat-number{font-size:11px;font-weight:400;display:block;color:#9ba594;margin-top:2px}.drop-over{outline:3px solid #dfa940!important;outline-offset:3px;background:#fff7da!important}.drag-ghost{position:fixed;left:0;top:0;z-index:1000;pointer-events:none;padding:13px 22px;border-radius:12px;background:#2d6a52;color:white;box-shadow:0 8px 24px #23432a44;font-weight:700;transform:translate(-50%,-65%)}.storage-note{font-size:12px;color:#87917d;margin:24px 0 0;line-height:1.8}.status{min-height:24px;font-size:14px;color:#426b52;margin:16px 0}.status.error{color:#a14d26}.loading{padding:25px;text-align:center;background:white;border-radius:16px;color:var(--muted)}footer{display:flex;justify-content:space-between;padding-top:18px;padding-bottom:25px;color:#86927c;font-size:12px;border-top:1px solid var(--border)}[hidden]{display:none!important}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}
@media(max-width:1150px){.groups-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.workspace{grid-template-columns:235px minmax(0,1fr)}.plan-bar{align-items:flex-start;flex-direction:column}.plan-panel{padding:18px}.roster-panel{padding:16px}}
@media(max-width:700px){.page-head,main,footer{padding-left:16px;padding-right:16px}.eyebrow{display:none}.heading{align-items:flex-start;flex-direction:column;gap:20px;padding-top:26px}.heading h1{font-size:28px}.settings{gap:12px;padding:16px}.divider{display:none}.capacity{margin:0;flex-basis:100%}.workspace{grid-template-columns:1fr}.roster-panel{position:static;max-height:320px}.student-list{grid-template-columns:repeat(4,minmax(0,1fr))}.groups-grid{gap:12px}.group{padding:10px}.plan-panel{padding:16px}.seat{font-size:14px;min-height:50px}.plan-actions{gap:6px}.board span{font-size:14px}.download{width:100%}.download button{flex:1}.settings label{flex:1;min-width:76px}.settings select{width:100%;min-width:0}.plan-bar{gap:14px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}
@media(min-width:701px) and (max-width:980px){.workspace{grid-template-columns:1fr}.roster-panel{position:static;max-height:280px}.student-list{grid-template-columns:repeat(6,minmax(0,1fr))}.empty-pool{padding:4px 0;margin:0}.plan-bar{flex-direction:row}}
.plan-panel{min-width:0}.grid-instruction{font-size:12px;color:#718075;line-height:1.8;margin:0 0 14px}.room-scroll{max-width:100%;overflow-x:auto;overscroll-behavior-x:contain;padding:5px 5px 12px}.classroom-map{--cell-height:46px;min-width:calc(32px + var(--grid-cols,14) * 62px)}.classroom-map[data-zoom="compact"]{min-width:calc(32px + var(--grid-cols,14) * 50px);--cell-height:40px}.classroom-map[data-zoom="large"]{min-width:calc(32px + var(--grid-cols,14) * 82px);--cell-height:58px}.rear-label{text-align:center;font-size:12px;letter-spacing:4px;color:#9aa58f;padding:8px 0 12px}.room-grid,.column-labels{display:grid;grid-template-columns:28px repeat(var(--grid-cols,14),minmax(0,1fr));gap:4px}.column-labels{padding-bottom:7px;text-align:center;color:#89967e;font-size:11px}.row-label{display:flex;align-items:center;justify-content:center;color:#89967e;font-size:11px}.room-grid .seat{height:var(--cell-height);min-height:0;padding:3px 1px;font-size:14px;border-radius:5px;border:1px solid #dce5d7;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;line-height:1.3}.room-grid .seat-name{max-width:100%;word-break:break-all}.room-grid .seat-number{font-size:10px;margin:0;color:#6f7d65}.empty-mark{color:#c5cebf;font-size:12px}.room-grid .seat:not(.occupied){background:#fafcf7}.classroom-map .board{margin:18px auto 0;max-width:480px}.group-legend{display:flex;gap:7px;flex-wrap:wrap;margin-top:14px}.group-chip{padding:4px 10px;border:1px solid #d7dfd0;border-radius:20px;font-size:12px;background:var(--group-color,#eef2e9)}[data-group="1"]{--group-color:#e4edda}[data-group="2"]{--group-color:#dcecf6}[data-group="3"]{--group-color:#f7e9cc}[data-group="4"]{--group-color:#eee0f3}[data-group="5"]{--group-color:#d7eeeb}[data-group="6"]{--group-color:#f6dfdc}[data-group="7"]{--group-color:#e0e3f5}[data-group="8"]{--group-color:#e8ebce}[data-group="9"]{--group-color:#dcebdc}[data-group="10"]{--group-color:#f4e1c9}[data-group="11"]{--group-color:#e7dfea}[data-group="12"]{--group-color:#d7e9f0}.room-grid .seat.occupied{background:var(--group-color,#eef2e9)}.room-grid .seat.occupied:hover{background:var(--group-color,#eef2e9)}.classroom-map[data-zoom="large"] .seat{font-size:17px}.classroom-map[data-zoom="compact"] .seat{font-size:12px}.settings #set-group{align-self:end;font-size:12px}.plan-bar{margin-bottom:16px}

.lab-hint{font-size:12px;line-height:1.8;color:#52745c;margin:0 0 10px}.plan-actions{justify-content:flex-end}.plan-bar>div:first-child{min-width:180px}.roster-panel h2{font-size:16px}

.cloud-bar{display:flex;align-items:center;justify-content:space-between;gap:16px;background:#edf5ed;border:1px solid #cedecc;border-radius:16px;padding:16px 22px;margin-bottom:22px}.cloud-bar strong{font-size:15px}.cloud-bar p{font-size:13px;color:#52745c;margin:6px 0 0;line-height:1.6}.cloud-actions{display:flex;gap:8px;flex-shrink:0}@media(max-width:700px){.cloud-bar{align-items:flex-start;flex-direction:column;padding:16px}.cloud-actions{width:100%}.cloud-actions button{flex:1}}
.room-grid .seat-id-input{box-sizing:border-box;width:100%;min-width:0;height:28px;min-height:0;padding:2px 1px;border:0;border-radius:4px;background:transparent;color:var(--ink);font-size:11px;text-align:center}.room-grid .seat-id-input::placeholder{color:#9aa58f;opacity:1}.room-grid .seat-id-input:focus{outline:2px solid #dfa940;outline-offset:0;background:#fff}.room-grid .seat-student{display:flex;flex:1;flex-direction:column;align-items:center;justify-content:center;gap:2px;width:100%;min-width:0;min-height:0;height:100%;padding:0 1px;border:0;border-radius:0;background:transparent;color:inherit;font-size:inherit;line-height:1.3;touch-action:none;user-select:none;-webkit-user-select:none}.room-grid .seat-student:hover:not(:disabled){background:transparent;border-color:transparent}