:root{--ink:#172126;--muted:#738086;--line:#e5eaeb;--bg:#f7f9f8;--card:#fff;--mint:#b9eadc;--mint-dark:#197963;--yellow:#fff0b8;--coral:#f47f65;--shadow:0 10px 30px rgba(31,65,59,.07)}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:Inter,"Apple SD Gothic Neo","Noto Sans KR",sans-serif}button,input,textarea,select{font:inherit}button{cursor:pointer;border:0;color:inherit}.app-shell{display:flex;min-height:100vh}.sidebar{width:238px;background:#fff;border-right:1px solid var(--line);padding:27px 18px;display:flex;flex-direction:column}.brand{display:flex;align-items:center;gap:10px;font-size:17px}.brand-mark{background:var(--ink);color:#fff;width:34px;height:34px;display:grid;place-items:center;border-radius:9px;font-size:18px}.brand small{display:block;letter-spacing:2px;color:#9ba5a8;font-size:8px;margin-top:3px}.class-card{margin:36px 3px 22px;padding:13px 11px;background:#f4f7f6;border-radius:11px;position:relative}.class-card span{display:block;color:var(--muted);font-size:11px;margin-bottom:4px}.class-card strong{font-size:14px}.icon-btn{position:absolute;right:9px;top:17px;background:transparent;color:#8a9698}.side-nav{display:grid;gap:5px}.nav-item{background:transparent;text-align:left;padding:14px 10px;border-radius:10px;color:#849093;font-weight:600}.nav-item span{font-size:10px;margin-right:12px;color:#b6c0c0}.nav-item.active{background:var(--mint);color:var(--ink)}.nav-item.active span{color:var(--mint-dark)}.sidebar-bottom{margin-top:auto;padding:14px 10px;color:#a0aaac;font-size:11px;border-top:1px solid var(--line)}.sidebar-bottom p{margin:0 0 4px}.main-content{flex:1;max-width:1500px;padding:38px 5.5vw 60px}.topbar{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:43px}.eyebrow{font-size:10px;letter-spacing:2.5px;color:var(--mint-dark);margin:0 0 7px;font-weight:800}.topbar h1{font-size:29px;margin:0;letter-spacing:-1.5px}.top-actions,.layout-actions,.result-actions{display:flex;gap:9px}.primary-btn,.outline-btn,.soft-btn{border-radius:8px;padding:11px 17px;font-weight:700;font-size:13px}.primary-btn{background:var(--ink);color:white}.primary-btn span{color:var(--mint);margin-left:16px}.outline-btn{background:#fff;border:1px solid var(--line)}.soft-btn{background:var(--mint);color:#155e50}.primary-btn:hover{background:#2a393d}.view{display:none}.view.active{display:block}.hero-row{display:flex;justify-content:space-between;align-items:flex-end;margin-bottom:25px}.hero-row h2{font-size:23px;margin:0 0 8px;letter-spacing:-1px}.hero-row p{color:var(--muted);font-size:13px;margin:0}.stat-grid{display:flex;gap:8px}.stat-grid div{background:white;border:1px solid var(--line);padding:11px 19px;border-radius:9px;min-width:90px}.stat-grid span{font-size:11px;color:var(--muted);display:block}.stat-grid b{font-size:23px}.content-grid{display:grid;gap:20px}.two-col{grid-template-columns:1.15fr .85fr}.panel{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:22px;box-shadow:var(--shadow)}.panel-head{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:18px}.panel h3{font-size:16px;margin:0 0 5px}.panel-head p{font-size:12px;color:var(--muted);margin:0}.bulk-add{display:flex;gap:8px;margin-bottom:15px}.bulk-add textarea{height:48px;resize:vertical;flex:1;border:1px solid var(--line);border-radius:8px;padding:9px 11px;font-size:12px}.student-table-wrap{min-height:245px}.student-table-wrap table{width:100%;border-collapse:collapse;font-size:13px}.student-table-wrap th{text-align:left;font-size:11px;color:#9aa5a6;font-weight:600;padding:10px;border-bottom:1px solid var(--line)}.student-table-wrap td{padding:10px;border-bottom:1px solid #f0f3f3}.gender-chip{display:inline-block;padding:4px 9px;border-radius:99px;font-size:11px}.gender-m{background:#e7f0ff;color:#4672b4}.gender-f{background:#fff0f4;color:#bd607d}.delete-btn{color:#aab4b5;background:none}.empty-state{text-align:center;color:#a9b2b4;font-size:13px;padding:52px 10px}.empty-state.large{padding:100px;background:#fff;border:1px dashed #d9e1e0;border-radius:12px}.status-pill{background:#e8f8f3;color:var(--mint-dark);font-size:10px;padding:5px 9px;border-radius:99px}.toggle-row{display:flex;justify-content:space-between;align-items:center;padding:14px 0;border-bottom:1px solid #eff2f2;gap:15px}.toggle-row b{font-size:13px;display:block}.toggle-row small{color:var(--muted);font-size:11px;display:block;margin-top:4px}.toggle-row input{display:none}.toggle-row i{width:38px;height:22px;background:#dce3e3;border-radius:30px;position:relative;flex:none}.toggle-row i:after{content:"";position:absolute;width:16px;height:16px;left:3px;top:3px;background:#fff;border-radius:50%;transition:.2s}.toggle-row input:checked+i{background:var(--mint-dark)}.toggle-row input:checked+i:after{transform:translateX(16px)}.field-row{display:flex;gap:10px;padding-top:15px}.field-row label{font-size:11px;color:var(--muted);flex:1}.field-row select{display:block;width:100%;margin-top:6px;border:1px solid var(--line);border-radius:7px;padding:8px;background:#fff;font-size:12px}.rule-note,.private-note{background:#fff9dd;color:#88763a;padding:11px;border-radius:7px;font-size:11px;margin-top:17px}.bottom-actions{display:flex;justify-content:flex-end;margin-top:20px}.next-btn{padding:14px 19px}.layout-editor{display:flex;gap:18px}.tool-palette{width:164px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:15px;height:max-content}.tool-palette h3{font-size:13px;margin:0 0 12px}.tool{width:100%;background:transparent;text-align:left;border-radius:7px;padding:10px;font-size:15px;margin-bottom:3px;color:#718082}.tool span{font-size:11px;margin-left:6px}.tool.active{background:var(--mint);color:var(--ink)}.palette-hint{border-top:1px solid var(--line);padding-top:14px;margin-top:10px;color:#a0aaac;font-size:10px;line-height:1.6}.classroom-wrap{flex:1}.classroom{height:480px;background:#fff;border:1px solid #dbe4e2;border-radius:12px;position:relative;overflow:hidden;background-image:linear-gradient(#f1f5f4 1px,transparent 1px),linear-gradient(90deg,#f1f5f4 1px,transparent 1px);background-size:32px 32px}.room-label{position:absolute;top:17px;left:50%;transform:translateX(-50%);font-size:10px;letter-spacing:2px;color:#a3aeae}.canvas-help{font-size:11px;color:#9da8aa;text-align:center;padding:9px}.room-item{position:absolute;min-width:78px;min-height:42px;border-radius:7px;border:2px solid #83cdbc;background:#d9f4eb;display:grid;place-items:center;font-size:11px;font-weight:700;user-select:none;cursor:grab;z-index:2}.room-item:active{cursor:grabbing}.room-item.teacher{background:#ffeab0;border-color:#e8c564}.room-item.board{background:#273b3d;color:#fff;border-color:#273b3d;width:190px;height:20px}.room-item.door{background:#f8dad1;border-color:#efaa98;width:62px;height:28px}.room-item.selected{outline:3px solid rgba(25,121,99,.2)}.draw-round{background:#fff;border:1px solid var(--line);border-radius:9px;padding:10px 18px;text-align:right}.draw-round span{display:block;color:var(--muted);font-size:10px}.draw-round b{font-size:17px}.mode-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-bottom:20px}.mode-card{position:relative;text-align:left;background:#fff;border:1px solid var(--line);border-radius:11px;padding:17px;display:flex;gap:12px;align-items:center}.mode-card.selected{border:2px solid var(--mint-dark);padding:16px;background:#f3fcf9}.mode-icon{font-size:26px;color:var(--mint-dark)}.mode-card b{display:block;font-size:13px}.mode-card small{color:var(--muted);display:block;font-size:11px;margin-top:5px}.mode-card em{position:absolute;right:11px;top:10px;font-style:normal;font-size:9px;color:var(--mint-dark)}.draw-layout{display:grid;grid-template-columns:1.3fr .7fr;gap:20px}.mini-seat-map,.result-map,.share-map{display:grid;gap:10px;grid-template-columns:repeat(5,1fr);background:#f5f8f7;border-radius:9px;padding:18px;min-height:220px}.seat{background:#d9f4eb;border:1px solid #9bdaca;border-radius:7px;min-height:48px;display:flex;align-items:center;justify-content:center;text-align:center;font-size:11px;padding:5px;position:relative}.seat.empty{background:#fff;border:1px dashed #ccd8d5;color:#b9c2c1}.seat.fixed:after{content:"●";color:#e5a75c;font-size:8px;position:absolute;right:5px;top:4px}.seat.drag-over{outline:3px solid var(--coral)}.control-highlight{background:#e9faf5;padding:15px;border-radius:8px;margin-bottom:8px}.control-highlight span{display:block;font-size:10px;color:var(--mint-dark)}.control-highlight strong{font-size:18px}.big-draw-btn{width:100%;font-size:15px;padding:16px;margin-top:19px}.full-btn{width:100%;margin-top:9px}.result-panel{margin-top:20px}.hidden{display:none!important}.result-map{grid-template-columns:repeat(5,1fr)}.result-map .seat{min-height:64px}.result-map .seat b{display:block}.records-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:15px}.record-card{background:#fff;border:1px solid var(--line);border-radius:11px;padding:17px}.record-card h3{font-size:14px;margin:0 0 4px}.record-card p{font-size:11px;color:var(--muted);margin:0 0 14px}.record-card button{font-size:11px;background:#f1f6f5;border-radius:6px;padding:8px 11px}.toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%) translateY(20px);background:var(--ink);color:#fff;padding:12px 17px;border-radius:8px;font-size:12px;opacity:0;transition:.25s;z-index:20}.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}.share-overlay{position:fixed;inset:0;background:#13282b;color:#fff;z-index:30;padding:6vh 8vw;overflow:auto}.close-share{position:absolute;right:30px;top:22px;background:transparent;color:#fff;font-size:30px}.share-head{text-align:center;margin-bottom:30px}.share-head span{color:var(--mint);font-size:12px;letter-spacing:2px}.share-head h2{font-size:36px;margin:10px}.share-map{max-width:1100px;margin:auto;background:#1d393b;gap:16px;padding:28px}.share-map .seat{background:#305658;border-color:#4f7474;color:#fff;min-height:80px;font-size:15px}.share-map .seat b{font-size:17px;display:block}.share-map .seat.empty{background:transparent;border-color:#355253}@media(max-width:950px){.sidebar{width:190px}.main-content{padding:28px}.two-col,.draw-layout{grid-template-columns:1fr}.mode-cards{grid-template-columns:1fr}.records-grid{grid-template-columns:1fr 1fr}}@media(max-width:680px){.app-shell{display:block}.sidebar{width:100%;padding:15px;display:block}.brand{display:inline-flex}.class-card{display:inline-block;margin:0 0 0 18px;padding:8px}.side-nav{display:flex;overflow:auto;margin-top:14px}.nav-item{white-space:nowrap;padding:9px}.sidebar-bottom{display:none}.main-content{padding:22px 15px}.topbar{margin-bottom:28px}.topbar h1{font-size:23px}.top-actions .outline-btn{display:none}.hero-row{display:block}.stat-grid{margin-top:18px}.layout-editor{display:block}.tool-palette{width:100%;display:flex;gap:5px;overflow:auto}.tool-palette h3,.palette-hint{display:none}.tool{width:auto;white-space:nowrap;margin:0}.classroom{height:430px}.records-grid{grid-template-columns:1fr}.field-row{display:block}.field-row label{display:block;margin-bottom:10px}}