:root{--bg:#f5f6f8;--surface:#fff;--text:#1f2430;--muted:#6b7280;--border:#e5e7eb;--accent:#2563eb;--accent-soft:#dbeafe;--accent-strong:#1d4ed8;--hit:#fde68a;--danger:#dc2626;--shadow:0 1px 3px #0000000f, 0 1px 2px #0000000a;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-family:system-ui,Segoe UI,Roboto,sans-serif}*{box-sizing:border-box}body{background:var(--bg);margin:0}h1,h2,h3{margin:0;font-weight:650}button{font:inherit;cursor:pointer}input,textarea{font:inherit}.app{flex-direction:column;min-height:100svh;display:flex}.topbar{background:var(--surface);border-bottom:1px solid var(--border);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;padding:16px clamp(16px,4vw,40px);display:flex}.brand{align-items:center;gap:14px;display:flex}.brand .logo{font-size:34px}.brand h1{font-size:20px;line-height:1.2}.brand .sub{color:var(--muted);margin:2px 0 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li.group-header.dragging{opacity:.5;border-color:var(--accent);border-style:dashed}.student-list.rows li.group-header .drag-handle{color:var(--accent)}.drag-handle{cursor:grab;color:var(--muted);-webkit-user-select:none;user-select:none;padding:0 2px;font-size:15px;line-height:1}.drag-handle:active{cursor:grabbing}.student-list.rows li.dragging{opacity:.5;border-color:var(--accent);border-style:dashed}.edit-input.group{box-shadow:none;border-color:var(--border);flex:0 120px}.edit-input.group:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}.plan-btn{border:1px solid var(--border);background:0 0;border-radius:7px;padding:3px 7px;font-size:14px;line-height:1}.plan-btn:hover{border-color:var(--accent)}.plan-btn.has-plan{background:var(--accent-soft);border-color:var(--accent)}.plan-btn.open{background:var(--accent)}.student-list.rows li.plan-row{background:0 0;border:none;padding:0;display:block}.weekly-plan{background:var(--bg);border:1px solid 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2px;font-size:14px;font-weight:700}.wp-cell:hover{border-color:var(--accent);background:var(--accent-soft)}.wp-cell.on{background:var(--accent);color:#fff;border-color:var(--accent)}.wp-cell.disabled{border:1px dashed var(--border);color:var(--muted);cursor:default;background:0 0}button.primary.sm,button.ghost.sm{border-radius:8px;padding:6px 12px;font-size:13px}.toggle-row{cursor:pointer;align-items:center;gap:12px;display:flex}.toggle-row>input{display:none}.toggle-track{background:var(--border);border-radius:20px;flex-shrink:0;width:44px;height:24px;transition:background .15s;position:relative}.toggle-thumb{background:#fff;border-radius:50%;width:20px;height:20px;transition:transform .15s;position:absolute;top:2px;left:2px;box-shadow:0 1px 2px #0003}.toggle-row>input:checked+.toggle-track{background:var(--accent)}.toggle-row>input:checked+.toggle-track .toggle-thumb{transform:translate(20px)}.toggle-label{font-size:14px}.gen-row{flex-wrap:wrap;gap:16px;margin-bottom:16px;display:flex}.gen-row label{flex-direction:column;flex:1;gap:6px;min-width:140px;font-size:14px;font-weight:550;display:flex}.today-btn{background:var(--accent-soft);border:1px solid var(--accent);color:var(--accent);border-radius:7px;align-self:flex-start;padding:4px 10px;font-size:12px;font-weight:600}.today-btn:hover{background:var(--accent);color:#fff}.gen-actions{gap:10px;display:flex}.hint{color:var(--muted);margin:14px 0 0;font-size:13px;line-height:1.5}.muted{color:var(--muted);font-size:14px}