:root{--board:#23453a;--board-deep:#1a362d;--chalk:#f4f5ef;--chalk-dim:#b9c9bf;--chalk-yellow:#f2c94c;--wall:#e4e9e4;--surface:#f7f9f7;--desk:#fff;--edge:#c9b48e;--ink:#1d2a25;--sub:#5b6b64;--line:#c8d1cc;--error:#b8392e;--warning:#9a6a12;--focus:#2f6fd6;--radius:8px;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{background:var(--wall);color:var(--ink);margin:0;font-family:BIZ UDPGothic,Hiragino Sans,Hiragino Kaku Gothic ProN,Yu Gothic,sans-serif;font-size:16px;line-height:1.7}h1,h2,h3{margin:0;line-height:1.35}a{color:var(--board)}button,input,select,textarea{font:inherit;color:inherit}:focus-visible{outline:3px solid var(--focus);outline-offset:2px}[hidden]{display:none!important}button{cursor:pointer;border-radius:var(--radius);white-space:nowrap;border:1px solid #0000;min-height:44px;padding:0 18px;font-weight:700}button:disabled{cursor:not-allowed;opacity:.45}.primary{background:var(--board);color:var(--chalk)}.primary:not(:disabled):hover{background:var(--board-deep)}.primary.big{min-height:56px;padding:0 32px;font-size:18px}.secondary{background:var(--desk);border-color:var(--line)}.secondary:not(:disabled):hover{border-color:var(--board)}.small{min-height:36px;padding:0 12px;font-size:14px}.text-button{color:var(--sub);text-underline-offset:3px;background:0 0;padding:0 8px;font-weight:400;text-decoration:underline}.text-button.danger{color:var(--error)}.chalk-button{color:var(--chalk);background:0 0;border-color:#f4f5ef80}.chalk-button:hover{border-color:var(--chalk)}input[type=text],input[type=number],select,textarea{border:1px solid var(--line);border-radius:var(--radius);background:var(--desk);width:100%;min-width:0;min-height:44px;padding:8px 12px}textarea{resize:vertical;line-height:1.6}.num-input{flex:none;width:5.5em!important}.hint{color:var(--sub);margin:4px 0 12px;font-size:14px}.hint.strong{color:var(--ink);font-weight:700}.lead{color:var(--sub);margin:0 0 16px}.note{text-align:center;color:var(--sub);margin:32px 0 24px;font-size:13px}.toast{left:50%;bottom:max(24px, env(safe-area-inset-bottom));background:var(--ink);color:var(--chalk);border-radius:var(--radius);z-index:10;max-width:calc(100vw - 32px);padding:10px 18px;font-size:14px;transition:opacity .3s;position:fixed;transform:translate(-50%)}.toast.out{opacity:0}.conn{background:var(--warning);color:#fff;text-align:center;margin:0;padding:8px 16px;font-size:14px;display:none}.conn.offline{display:block}.classroom{max-width:760px;margin:0 auto;container-type:inline-size}.board{background:var(--board);color:var(--chalk);border-radius:var(--radius);text-align:center;letter-spacing:.04em;border-bottom:6px solid #8d7a5a;padding:10px 16px;font-size:14px}.lectern{background:var(--edge);width:30%;max-width:160px;color:var(--ink);text-align:center;border-radius:4px;margin:10px auto 14px;padding:2px 0;font-size:12px;font-weight:700}.desks{grid-template-columns:repeat(var(--cols), minmax(0, 1fr));-webkit-user-select:none;user-select:none;gap:clamp(4px,1.4cqw,12px);display:grid}.desks.paint{touch-action:none}.desk,.gap{aspect-ratio:3/2;min-width:0}@container (width<=560px){.desk,.gap{aspect-ratio:1}}.desk{background:var(--desk);border-bottom:4px solid var(--edge);text-align:center;--fs:min(17px, calc(100cqw / var(--cols) / 4.6));border-radius:5px;flex-direction:column;justify-content:center;align-items:center;padding:2px;display:flex;position:relative;overflow:hidden;box-shadow:0 1px #1d2a251f}.desk .num{font-size:calc(var(--fs) * .75);color:var(--sub);font-variant-numeric:tabular-nums;line-height:1.1}.desk .name{font-size:var(--fs);word-break:keep-all;overflow-wrap:anywhere;-webkit-line-clamp:2;-webkit-box-orient:vertical;font-weight:700;line-height:1.2;display:-webkit-box;overflow:hidden}.desk.off{border:1px dashed var(--line);box-shadow:none;color:var(--sub);background:0 0}.desk.off .name{font-weight:400;font-size:calc(var(--fs) * .8)}.desk.vacant{background:#ffffff73}.desk.tinted{background:color-mix(in srgb, var(--tag) 22%, white);border-bottom-color:var(--tag)}.desk.tinted .name{font-weight:400;font-size:calc(var(--fs) * .8);color:color-mix(in srgb, var(--tag) 60%, var(--ink))}.desk.fixed{background:color-mix(in srgb, var(--board) 12%, white)}.desk.pickable{cursor:pointer;outline:2px dashed color-mix(in srgb, var(--board) 40%, transparent);outline-offset:-4px}.desk.pickable:hover{background:color-mix(in srgb, var(--chalk-yellow) 30%, white)}.paint .desk{cursor:pointer}.paint .desk.painted-on,.paint .desk.painted-off{outline:3px solid var(--chalk-yellow);outline-offset:-3px}.stage .board{justify-content:center;align-items:center;min-height:132px;padding:18px 16px 16px;display:flex}.board-text p{margin:0}.board-big{letter-spacing:.02em;font-size:clamp(22px,6cqw,40px);font-weight:700;line-height:1.3}.board-big.count{color:var(--chalk-yellow);font-size:clamp(56px,16cqw,96px);line-height:1}.board-sub{color:var(--chalk-dim);min-height:1.5em;font-size:14px;margin-top:6px!important}.stage .desk.flip{transform:translateY(-1px)}.stage.landed .desk:not(.vacant){animation:.9s ease-out land}@keyframes land{0%{background:var(--chalk-yellow);transform:scale(1.06)}to{background:var(--desk);transform:scale(1)}}@media (prefers-reduced-motion:reduce){.stage.landed .desk:not(.vacant){animation:none}.stage .desk.flip{transform:none}}.home{max-width:640px;margin:0 auto;padding:24px 16px}.home-board{background:var(--board);color:var(--chalk);border-radius:var(--radius);border-bottom:8px solid #8d7a5a;padding:36px 24px 32px}.home-board h1{letter-spacing:.04em;font-size:clamp(36px,10vw,56px)}.home-board p{color:var(--chalk-dim);margin:10px 0 0}.steps{counter-reset:step;gap:14px;margin:28px 0;padding:0;list-style:none;display:grid}.steps li{counter-increment:step;grid-template-columns:36px 1fr;column-gap:12px;display:grid}.steps li:before{content:counter(step);background:var(--desk);border-bottom:3px solid var(--edge);border-radius:50%;grid-row:span 2;place-items:center;width:32px;height:32px;font-weight:700;display:grid}.steps span{color:var(--sub);font-size:14px}.create{background:var(--desk);border-radius:var(--radius);border-bottom:4px solid var(--edge);padding:20px}.create label{margin-bottom:8px;font-weight:700;display:block}.create-row{gap:8px;display:flex}.my-rooms{margin-top:32px}.my-rooms h2{margin-bottom:8px;font-size:16px}.my-rooms ul{margin:0;padding:0;list-style:none}.my-rooms li{border-bottom:1px solid var(--line);justify-content:space-between;gap:12px;padding:10px 0;display:flex}.my-rooms li a{overflow-wrap:anywhere;min-width:0;font-weight:700}.my-rooms li span{color:var(--sub);flex:none;font-size:14px}.viewer{max-width:760px;margin:0 auto;padding:12px 16px 0}.viewer-head{justify-content:space-between;align-items:baseline;gap:12px;margin-bottom:10px;display:flex}.room-title{overflow-wrap:anywhere;min-width:0;font-size:18px}.viewers{color:var(--sub);flex:none;font-size:13px}.viewer-actions{justify-content:center;margin-top:20px;display:flex}.admin-head{background:var(--board);color:var(--chalk);flex-wrap:wrap;align-items:center;gap:12px;padding:10px 16px;display:flex}.brand{color:var(--chalk);flex:none;font-weight:700;text-decoration:none}.title-input{flex:200px;font-weight:700;color:var(--chalk)!important;background:#f4f5ef14!important;border-color:#f4f5ef40!important;font-size:17px!important}.title-input::placeholder{color:var(--chalk-dim)}.share{align-items:center;gap:12px;margin-left:auto;display:flex}.admin-head .viewers{color:var(--chalk-dim)}.tabs{gap:4px;max-width:960px;margin:16px auto 0;padding:0 16px;display:flex;overflow-x:auto}.tab{border-radius:var(--radius) var(--radius) 0 0;color:var(--sub);background:0 0;align-items:center;gap:6px;padding:0 18px;display:flex}.tab small{font-size:12px;font-weight:400}.tab[aria-selected=true]{background:var(--surface);color:var(--ink)}.tab.has-error small{color:var(--error);font-weight:700}.tab-content{max-width:960px;margin:0 auto 48px;padding:0 16px}.panel{background:var(--surface);border-radius:0 var(--radius) var(--radius) var(--radius);padding:20px}.add-row{flex-wrap:wrap;gap:8px;margin:12px 0;display:flex}.add-row>input[type=text],.add-row>select{flex:160px;width:auto}.row-buttons{flex-wrap:wrap;gap:8px;margin-top:10px;display:flex}.empty{color:var(--sub);padding:16px 0}.roster-table{border-collapse:collapse;width:100%}.roster-table th{text-align:left;color:var(--sub);padding:4px 6px;font-size:13px;font-weight:400}.roster-table td{border-top:1px solid var(--line);vertical-align:middle;padding:4px 6px}.roster-table td:first-child{width:6em}.roster-table td:last-child{width:1%}.tag-cell{flex-wrap:wrap;gap:4px;display:flex}.chip{background:var(--desk);border:1px solid var(--line);min-height:32px;color:var(--sub);border-radius:999px;padding:0 10px;font-size:13px;font-weight:400}.chip.on{background:var(--tag);border-color:var(--tag);color:#fff;font-weight:700}.paste{border-top:1px solid var(--line);margin-top:20px;padding-top:12px}.paste summary{cursor:pointer;align-items:center;min-height:44px;font-weight:700;display:flex}.line-controls{gap:8px;margin-bottom:12px;display:grid}.line-group{flex-wrap:wrap;align-items:center;gap:6px;display:flex}.line-label{flex:none;width:4.5em;font-weight:700}.seat-count{margin:0 0 12px;font-weight:700}.seat-count.bad{color:var(--error)}.rule{border-bottom:1px solid var(--line);margin-bottom:20px;padding:4px 0 20px}.rule:last-child{border-bottom:none;margin-bottom:0}.rule h2{font-size:18px}.tag-list,.pair-list{margin:0;padding:0;list-style:none}.tag-list li,.pair-list li{border-bottom:1px solid var(--line);flex-wrap:nowrap;align-items:center;gap:10px;padding:6px 0;display:flex}.tag-list li>*,.pair-list li>button{flex:none}.tag-list b,.tag-list .meta span{white-space:nowrap}.tag-list li.editing{border-bottom:none}.dot{border-radius:50%;flex:none;width:14px;height:14px}.tag-list .meta{color:var(--sub);gap:8px;min-width:0;font-size:14px;display:flex;overflow:hidden;flex:auto!important}.pair-list span{flex:1;min-width:0}.tag-editor{border:2px solid var(--tag);border-radius:var(--radius);background:var(--wall);margin:8px 0 12px;padding:16px}.tag-editor h3{margin-top:4px;font-size:16px}.tag-editor h3+.hint{margin-bottom:12px}.tag-editor .classroom{margin-bottom:20px}.member-chips{flex-wrap:wrap;gap:6px;margin-top:8px;display:flex}.check{cursor:pointer;align-items:center;gap:10px;min-height:44px;display:flex}.check input{width:22px;height:22px;accent-color:var(--board)}.issues ul{gap:6px;margin:0;padding:0;list-style:none;display:grid}.issue{border-radius:var(--radius);border-left:4px solid var(--line);background:var(--desk);margin:0;padding:8px 12px;font-size:15px}.issue.error{border-left-color:var(--error);color:var(--error);font-weight:700}.issue.warning{border-left-color:var(--warning)}.issue.info,.issue.ok{color:var(--sub)}.share-box{background:var(--desk);border-radius:var(--radius);justify-content:space-between;align-items:center;gap:12px;margin-bottom:16px;padding:12px 16px;display:flex}.share-box .url{color:var(--sub);overflow-wrap:anywhere;margin:0;font-size:14px}.draw .issues{margin-bottom:16px}.draw-actions{flex-wrap:wrap;justify-content:center;align-items:center;gap:8px;margin-bottom:20px;display:flex}@media (width<=600px){.panel{padding:16px 12px}.tabs{gap:2px;padding:0 12px}.tab{flex:1;justify-content:center;padding:0 6px}.roster-table thead{display:none}.roster-table tr{border-top:1px solid var(--line);grid-template-columns:auto 1fr auto;gap:6px;padding:8px 0;display:grid}.roster-table td{border:none;padding:0;width:auto!important}.roster-table .tag-cell{grid-area:2/1/auto/-1}.admin-head .share{justify-content:space-between;width:100%;margin-left:0}.num-input{width:4.2em!important;padding:8px 6px!important}.create-row{flex-direction:column}}