:root{--ink:#183e34;--muted:#62756d;--paper:#f6f8f4;--line:#dce4dc;--primary-color:#34775b;--pro:#267155;--contra:#a15e37;--shadow:0 12px 38px #193d3109}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:15px/1.55 -apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}button,input,textarea,select{font:inherit}button,a,input,textarea,select{touch-action:manipulation}button{cursor:pointer;border:1px solid #cedbd1;border-radius:8px;padding:9px 14px;background:#fff;color:var(--ink);font-weight:600}button:hover{background:#eef3ec;border-color:#9bb4a4}button:disabled{opacity:.45;cursor:default}a{color:inherit}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #b38838;outline-offset:3px}h1,h2,h3,p{margin-top:0}h2{font-size:23px;letter-spacing:-.6px}h3{font-size:17px}label{display:block;font-size:13px;font-weight:650;margin:0 0 17px}input,textarea,select{display:block;width:100%;margin-top:7px;padding:11px 12px;border:1px solid #cbd7ce;border-radius:7px;color:var(--ink);background:#fff;min-width:0}textarea{resize:vertical}input:focus,textarea:focus,select:focus{border-color:#4c876b}.brand{display:flex;align-items:center;gap:12px;max-width:1300px;margin:0 auto;padding:84px 28px 25px}.brand>a{text-decoration:none;font-weight:750;font-size:19px;letter-spacing:-.6px}.brand>a span{font-weight:400}.beta{font-size:10px;font-weight:750;letter-spacing:1.1px;border:1px solid #bcccb9;border-radius:4px;padding:2px 6px}.brand .text-button{margin-left:auto}.text-button{border:0;background:transparent;padding:5px 0;font-size:13px;text-decoration:underline;text-underline-offset:3px}main{max-width:1300px;margin:auto;padding:0 28px 40px}.hero{padding:38px 0 28px;max-width:740px}.eyebrow{font-size:10px;letter-spacing:1.65px;font-weight:750;color:var(--muted);margin-bottom:12px}.hero h1{font:600 clamp(40px,5.2vw,66px)/1.07 Georgia,serif;letter-spacing:-2px;margin-bottom:22px}.hero em{font-weight:400;color:#66865a}.lead{font-size:17px;line-height:1.65;max-width:600px;color:#5d7166}.steps{display:flex;gap:28px;margin-top:26px;font-size:13px;color:#5c7264}.steps b{display:inline-flex;width:27px;height:27px;border-radius:50%;align-items:center;justify-content:center;background:#e7eddc;margin-right:7px;font-size:10px;color:#61764a}.entry-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;max-width:1060px;margin-top:8px}.panel{padding:30px;border:1px solid var(--line);border-radius:14px;background:#fff;box-shadow:var(--shadow)}.create-panel{background:#edf2e8}.panel form{margin-top:24px}.primary{color:#fff;background:var(--ink);border-color:var(--ink)}.primary:hover{color:#fff;background:#2c5e49;border-color:#2c5e49}.secondary{background:transparent;border-color:#8da284}.wide{width:100%;display:flex;justify-content:space-between;align-items:center;padding:13px 17px}.code-input{font-size:24px;letter-spacing:6px;font-weight:650;text-transform:uppercase}.muted{font-size:12px;color:var(--muted);font-weight:400}.privacy{max-width:850px;font-size:11px;color:#708075;margin-top:25px}.recent{margin-top:30px}.recent h2{font-size:17px}.recent button{margin:0 8px 8px 0;max-width:100%;overflow-wrap:anywhere}footer{max-width:1300px;border-top:1px solid var(--line);padding:25px 28px;margin:0 auto;display:flex;gap:25px;flex-wrap:wrap;font-size:11px;color:var(--muted)}footer>span{margin-right:auto}.room-top{display:flex;justify-content:space-between;align-items:center;gap:30px;padding:24px 0}.room-title{max-width:850px}.room-title h1{font:500 clamp(26px,3vw,38px)/1.2 Georgia,serif;overflow-wrap:anywhere;margin:0}.room-code{flex:none;min-width:170px;background:#e9eedf;border-color:#dbe3cf;text-align:left;padding:13px 18px}.room-code span{display:block;font-size:9px;letter-spacing:1.7px}.room-code strong{display:block;font-size:26px;letter-spacing:4px}.room-code small{font-size:10px;font-weight:400}.room-meta{display:flex;align-items:center;gap:20px;font-size:11px;color:var(--muted);margin-bottom:24px;flex-wrap:wrap}.room-meta #connection:before{content:'';display:inline-block;width:6px;height:6px;background:#448764;border-radius:50%;margin-right:6px}.room-meta #connection.offline{color:#ac4c2e}.room-meta #connection.offline:before{background:#ac4c2e}.room-meta #leave{margin-left:auto}.toolbar{display:flex;align-items:center;gap:12px;justify-content:space-between;padding:14px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);flex-wrap:wrap}.view-tabs{display:flex;background:#e8ede5;border-radius:8px;padding:4px}.view-tabs button{border:0;background:transparent;font-size:12px;padding:9px 15px}.view-tabs .selected{background:#fff;box-shadow:0 2px 4px #25452a0c}.toolbar-actions{display:flex;gap:8px;flex-wrap:wrap}.toolbar-actions button{font-size:12px}.phase-line{display:flex;gap:15px;align-items:center;padding:18px 0 9px;font-size:11px;flex-wrap:wrap}.phase-line #phase{font-weight:700}.phase-line #members{margin-left:auto;color:var(--muted)}.quality{display:flex;gap:9px;flex-wrap:wrap;font-size:11px}.quality span{background:#eaf0e6;border-radius:5px;padding:5px 9px}.quality .attention{background:#f3eadb;color:#805b27}.board-intro{display:flex;justify-content:space-between;gap:20px;color:var(--muted);font-size:12px;padding:18px 0 10px}.board-intro p{margin:0}.board-intro .muted{max-width:335px;text-align:right;font-size:11px}.columns{display:grid;grid-template-columns:1fr 1fr;gap:22px}.column{background:#edf2eb;border:1px solid #dbe4d8;border-radius:12px;min-width:0;padding:18px}.column.contra{background:#f5efea;border-color:#e6ded5}.column-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:15px}.column-header .eyebrow{font-size:9px;letter-spacing:1.4px}.column-header h2{margin:0;font-size:25px}.column-header h2 span{font-family:inherit;font-size:12px;background:#dbe7d4;border-radius:50%;padding:3px 7px;vertical-align:middle;margin-left:4px}.contra .column-header h2 span{background:#ecded0}.add-argument{font-size:11px;padding:7px 10px;background:#ffffffa0}.node-list{min-height:230px;padding-bottom:30px}.node-card{background:#fff;border:1px solid #dce4db;border-radius:9px;padding:15px;margin-bottom:12px;box-shadow:0 2px 5px #27452905;scroll-margin-top:25px}.node-card.node-selected{outline:2px solid #739b60}.node-head{display:flex;align-items:center;gap:6px;margin-bottom:9px;font-size:10px}.type-tag{font-weight:750;background:#edf3e8;border-radius:4px;padding:3px 7px;color:#3e7155}.contra-tag{color:#985329;background:#f8eede}.author{margin-left:auto;color:var(--muted);overflow-wrap:anywhere}.drag-handle{border:0;background:transparent;padding:0 4px;cursor:grab;color:#718578;font-size:16px}.node-text{white-space:pre-wrap;overflow-wrap:anywhere;font-size:14px;line-height:1.6;margin:0 0 10px}.node-source{border-left:2px solid #cedcc8;padding-left:9px;white-space:pre-wrap;overflow-wrap:anywhere;font-size:11px;color:var(--muted);margin:0 0 10px}.node-actions{display:flex;gap:3px;flex-wrap:wrap}.node-actions button{font-size:10px;border:0;background:transparent;padding:5px 6px;color:#4c695a}.node-actions button:hover{background:#edf3e9}.node-actions .reply-button{color:#9b5738}.children{border-left:2px solid #dce6d5;padding-left:12px;margin-top:12px}.children summary{font-size:10px;color:#64805f;cursor:pointer;margin-bottom:10px}.children .node-card{box-shadow:none;padding:11px;margin-bottom:8px}.empty{font-size:13px;max-width:320px;color:#72816c;line-height:1.7;margin:50px auto;text-align:center}.drop-over{outline:2px dashed #508961!important;background:#edf5e3!important}.dragging{opacity:.45}.plan-controls{display:flex;align-items:center;gap:20px;margin:24px 0}.plan-controls label{min-width:180px;margin:0}.plan-controls p{max-width:330px;margin-left:auto}#plan{background:#fff;border:1px solid var(--line);border-radius:10px;padding:35px;max-width:950px;margin:0 auto}#plan h2{font:500 27px Georgia,serif;margin-top:25px}.plan-entry{border-left:2px solid #d4dfd0;margin:15px 0;padding:0 0 0 15px}.plan-entry h3{font-size:13px;margin:0 0 7px}.plan-entry .node-text{font-size:13px}.plan-entry.root-entry{border-color:#39775a;margin-top:24px}.plan-prose{white-space:pre-wrap;overflow-wrap:anywhere}dialog{border:1px solid #d5dfd1;border-radius:15px;padding:27px;width:min(660px,calc(100vw - 28px));max-height:90dvh;overflow:auto;color:var(--ink);box-shadow:0 25px 80px #0e34244a;background:#fff}dialog::backdrop{background:#18382b70;backdrop-filter:blur(3px)}.dialog-header{display:flex;align-items:flex-start;gap:15px;justify-content:space-between;margin-bottom:18px}.dialog-header h2{font-size:22px;margin:0}.dialog-header button{border:0;padding:0 8px;background:transparent;font-size:24px;line-height:1.2}.dialog-actions{display:flex;gap:10px;justify-content:flex-end;flex-wrap:wrap;margin-top:25px}.two-fields{display:grid;grid-template-columns:1fr 1fr;gap:16px}.reference{font-size:12px;padding:12px;border-left:3px solid #8ca785;background:#f2f5ef;white-space:pre-wrap;overflow-wrap:anywhere;max-height:140px;overflow:auto}.writing-hint{background:#edf3e8;border-radius:6px;padding:12px;font-size:12px}.check{display:flex;align-items:center;gap:9px}.check input{width:auto;margin:0}.danger{color:#a74733}.help-steps{padding-left:23px;font-size:14px}.help-steps li{padding-left:4px;margin-bottom:20px}.help-steps strong{display:block}.error-box{background:#fff0e9;color:#943c28;padding:12px;border-radius:7px;font-size:12px}.person{display:flex;justify-content:space-between;gap:15px;padding:10px 0;border-bottom:1px solid var(--line)}.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:#173f33;color:white;padding:14px 22px;border-radius:10px;box-shadow:var(--shadow);font-size:13px;max-width:calc(100% - 30px);width:max-content;z-index:20000}.toast.error{background:#91422e}[hidden]{display:none!important}@media(min-width:1200px){#lobby{position:relative}.hero{padding-top:35px;padding-bottom:32px}.entry-grid{margin-top:0;max-width:none}.panel{padding:30px 35px}}@media(max-width:800px){.brand{padding:85px 20px 15px}.brand>a{font-size:16px}main{padding:0 16px 30px}.columns{grid-template-columns:1fr}.entry-grid{gap:16px}.panel{padding:22px}.hero h1{font-size:49px}.plan-controls{flex-wrap:wrap}.plan-controls p{margin:0}.room-top{gap:15px}.room-code{min-width:140px;padding:12px}.room-code strong{font-size:22px}.board-intro{display:block}.board-intro .muted{max-width:none;text-align:left;margin-top:5px}#plan{padding:20px}.children{padding-left:8px}.node-list{min-height:140px}}@media(max-width:550px){.entry-grid{grid-template-columns:1fr}.hero{padding-top:22px}.hero h1{font-size:43px}.lead{font-size:15px}.steps{gap:12px;font-size:11px}.room-top{align-items:flex-start;flex-direction:column}.room-code{width:100%;display:flex;align-items:center;justify-content:space-between;gap:8px}.room-code small{max-width:100px;text-align:right}.brand>a span{display:none}.toolbar-actions{width:100%}.toolbar-actions #pdf{margin-left:auto}.view-tabs{width:100%}.view-tabs button{flex:1}.phase-line #members{margin-left:0}.two-fields{grid-template-columns:1fr;gap:0}.plan-controls label{min-width:140px;flex:1}.column{padding:12px}.node-card{padding:12px}.node-head{flex-wrap:wrap}.children{margin-left:0;padding-left:5px}.children .children .children{border-left:0;padding-left:0}dialog{padding:20px}.room-meta{gap:10px}.privacy{font-size:10px}}
/* Classroom planning and touch-first movement, 2026-10-09. */
.single-room{margin-top:22px}.single-room summary{cursor:pointer;font-size:13px}.brand #teacher-button{margin-left:auto;min-height:44px}.brand #help-button{margin-left:0}.class-heading,.class-switch,.class-actions,.class-all{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.class-heading{justify-content:space-between;margin:20px 0}.class-heading h1{font:500 34px Georgia,serif;margin-bottom:8px}.class-switch{margin-bottom:24px}.class-switch label{flex:1;min-width:200px;margin:0}.class-switch button{margin-top:23px}#teacher .panel{margin-bottom:22px}#teacher button,#teacher select,#teacher input:not([type=checkbox]),#move-dialog button,#move-dialog select{min-height:48px;font-size:14px}#teacher input[type=checkbox]{width:26px;height:26px;cursor:pointer}.class-all{margin:20px 0}.class-all span{margin-left:auto;font-size:13px}.assignment-scroll{overflow-x:auto}.assignment-table{width:100%;border-collapse:collapse;font-size:14px}.assignment-table th,.assignment-table td{padding:10px;text-align:left;border-bottom:1px solid var(--line)}.assignment-table th:first-child{width:100px}.assignment-table select{margin:0;min-width:180px}.assignment-table .absent{color:#7f8a82;background:#f4f5f2}.class-room-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:15px}.class-room{border:1px solid var(--line);border-radius:10px;background:#f7faf4;padding:20px}.class-room h3{margin-bottom:8px}.class-code{font-size:27px;letter-spacing:3px}.class-room ul{padding-left:18px}.class-room li{overflow-wrap:anywhere}.class-room li small{color:var(--muted);margin-left:5px}.class-error{color:#983d2a;font-size:13px;overflow-wrap:anywhere}#class-status{font-weight:600}#class-summary{margin:16px 0}.node-actions{gap:7px}.node-actions button{min-height:44px;font-size:12px;padding:9px 11px;border:1px solid #dbe5da;background:#fafcf8}.node-actions .move-main-button{flex-basis:100%;background:#e8f0e1;border:1px solid #97b28a;color:#244c36;font-size:14px;font-weight:750;min-height:48px}.move-modes,.move-destinations,.move-arrows{display:flex;gap:10px;margin:15px 0;flex-wrap:wrap}.move-modes button,.move-arrows button{flex:1;min-width:180px}.move-modes .selected,.move-destinations .selected{background:#254d3b;border-color:#254d3b;color:white}.move-destinations button{flex:1;min-width:135px}.move-preview{list-style:none;padding:0;max-height:280px;overflow:auto;border:1px solid var(--line);border-radius:8px}.move-preview li{padding:12px;display:flex;gap:10px;border-bottom:1px solid var(--line);font-size:13px;overflow-wrap:anywhere}.move-preview .moving-item{background:#e8f1df;border:2px solid #4e7c3e}.move-preview strong{display:block}#move-context{font-size:13px;overflow-wrap:anywhere}#move-dialog .dialog-actions button{min-width:130px}#move-dialog{width:min(760px,calc(100vw - 28px))}.class-presentation{width:100vw;max-width:none;height:100dvh;max-height:none;margin:0;border-radius:0;padding:24px 4vw;background:#f4f7ef}.presentation-toolbar{display:flex;gap:12px;align-items:center}.presentation-toolbar strong{margin-right:auto}.presentation-toolbar button,.presentation-pages button{min-height:48px}.class-presentation>h2{font:500 clamp(24px,3vw,38px)/1.2 Georgia,serif;margin:22px 0 8px}.class-presentation>p{font-size:14px;margin-bottom:20px}#presentation-cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}#presentation-cards article{background:white;border:2px solid #d2dfc6;border-radius:12px;padding:20px;overflow-wrap:anywhere}#presentation-cards h3{font-size:18px;margin-bottom:8px}#presentation-cards strong{font-size:clamp(28px,3.8vw,54px);letter-spacing:4px}#presentation-cards ul{padding-left:0;list-style:none;margin:14px 0 0;font-size:clamp(15px,1.6vw,23px)}#presentation-cards small{font-size:.75em;color:#5b6f59}.presentation-pages{display:flex;justify-content:center;align-items:center;gap:24px;margin-top:24px}#presentation-page{font-weight:700}@media(max-width:850px){#presentation-cards{grid-template-columns:repeat(2,minmax(0,1fr))}.class-heading h1{font-size:29px}.class-switch button{margin-top:0}}@media(max-width:550px){.brand{flex-wrap:wrap}.brand #teacher-button{font-size:12px;padding:7px}.brand #help-button{font-size:12px}#presentation-cards{gap:8px}#presentation-cards article{padding:12px}#presentation-cards strong{font-size:24px;letter-spacing:2px}.class-presentation{padding:14px}.presentation-toolbar button{font-size:11px;padding:7px}.presentation-pages{gap:10px}.presentation-pages button{font-size:12px}.move-arrows{display:grid;grid-template-columns:1fr}.assignment-table th,.assignment-table td{padding:8px}.class-actions>*{width:100%}}

.assignment-scroll{max-height:430px}.assignment-table thead{position:sticky;top:0;background:#fff;z-index:1}

/* Direct sorting: Pointer Events support mouse, touch and pen on the same handle. */
.node-head{flex-wrap:wrap}
.node-head .drag-handle{display:inline-flex;align-items:center;justify-content:center;gap:7px;margin-left:auto;min-width:104px;min-height:48px;padding:10px 14px;border:1px solid #97b28a;border-radius:8px;background:#e8f0e1;color:#234936;font-family:inherit;font-size:14px;font-weight:700;line-height:1.2;cursor:grab;touch-action:none;-webkit-touch-callout:none;user-select:none;-webkit-user-select:none}
.node-head .drag-handle span{font-size:24px;line-height:1}
.node-head .drag-handle:active{cursor:grabbing;background:#d5e5c9}
.node-head .drag-handle:focus-visible{outline:3px solid #376c53;outline-offset:3px}
.node-head .drag-handle:disabled{opacity:.45;cursor:default}
.drop-child-zone{display:none}
.node-face{position:relative}
.sorting .drop-child-zone{position:absolute;bottom:0;left:0;right:0;z-index:2;display:flex;align-items:center;justify-content:center;min-height:48px;margin:0;padding:8px;box-sizing:border-box;border:2px dashed #96b6a7;border-radius:8px;background:#f3f8f5;color:#305b46;font-size:12px;font-weight:650;text-align:center}
.sorting .node-list>.empty{display:none}
.sorting .drop-child-zone.nest-drop-active{background:#dcefdc;border-color:#3d805d;box-shadow:0 0 0 2px #3d805d33}
.sorting,.argument-drag-active{cursor:grabbing;user-select:none;-webkit-user-select:none;overflow-anchor:none}
.argument-drag-active .node-card{overflow-anchor:none}
.drag-placeholder{display:flex;flex-direction:column;justify-content:center;gap:5px;min-height:84px;margin:0 0 12px;padding:15px;border:2px dashed #3d805d;border-radius:9px;background:#dcefdc;color:#1c5034;box-sizing:border-box;overflow-wrap:anywhere;pointer-events:auto}
.drag-placeholder strong{font-size:14px}.drag-placeholder span{font-size:12px}
.drag-ghost{position:fixed;z-index:20001;pointer-events:none;display:flex;flex-direction:column;gap:7px;width:min(290px,calc(100vw - 32px));padding:14px 17px;border:1px solid #679176;border-radius:10px;background:#fffef5;color:#244536;box-shadow:0 12px 32px #163e3438;box-sizing:border-box;overflow-wrap:anywhere;opacity:.96}
.drag-ghost strong{font-size:12px}.drag-ghost span{font-size:13px;line-height:1.45}
.drag-placeholder.invalid-drop{opacity:.4}.drag-ghost.invalid-drop{border-color:#ae7768;opacity:.65}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

/* Prominent app title and compact entry without the introductory hero. */
.brand{flex-wrap:wrap}
.brand>a{max-width:100%;font-size:clamp(30px,4.2vw,54px);line-height:1.1;letter-spacing:-1.2px}
.brand>a span{display:inline}

.pingpong-column{max-width:850px;margin:0 auto}.pingpong-add{display:flex;gap:8px;flex-wrap:wrap}.sequence-number{display:inline-flex;justify-content:center;align-items:center;min-width:30px;height:30px;border-radius:50%;background:#e9efe6;color:#2e503c;font-size:14px;font-weight:750}.board-model-label{max-width:400px;margin-bottom:18px}