:root{--bg: #f4f6f9;--panel: #ffffff;--line: #e2e6ec;--text: #1f2733;--muted: #8a93a2;--accent: #2f6fed;--common: #6b7280;--general: #2f6fed;--career: #16a34a;--fusion: #d97706;font-family:system-ui,-apple-system,Segoe UI,Malgun Gothic,sans-serif}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--text);font-size:14px}button{font:inherit;cursor:pointer;border:1px solid var(--line);background:#fff;border-radius:6px;padding:5px 10px}button:hover{background:#f0f3f8}button:disabled{cursor:default;opacity:.55}button.primary{background:#2563eb;border-color:#2563eb;color:#fff;font-weight:600}button.primary:hover{background:#1d4ed8}button.primary:disabled{background:#93b4f0;border-color:#93b4f0;opacity:1}button.ghost{color:var(--muted)}button.danger{color:#dc2626;border-color:#f0c4c4}button.danger:hover{background:#fdecec}input,select{font:inherit;border:1px solid var(--line);border-radius:6px;padding:4px 7px}.muted{color:var(--muted)}.pad{padding:10px}.app{display:flex;flex-direction:column;height:100vh}.screen-msg{height:100vh;display:flex;flex-direction:column;gap:10px;align-items:center;justify-content:center;color:var(--text);text-align:center}.screen-msg .muted{font-size:13px}.topbar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 16px;background:var(--panel);border-bottom:1px solid var(--line);flex-wrap:wrap}.brand{font-size:16px}.brand strong{color:var(--accent)}.plan-controls{display:flex;align-items:center;gap:6px;flex-wrap:wrap}.plan-controls select{min-width:150px;max-width:240px}.plan-controls .sep{width:1px;height:22px;background:var(--line);margin:0 4px}.body{display:flex;flex:1;min-height:0}.pool{width:300px;flex-shrink:0;background:var(--panel);border-right:1px solid var(--line);display:flex;flex-direction:column}.pool-head{display:flex;align-items:baseline;justify-content:space-between;padding:10px 12px 4px}.pool-head h2{margin:0;font-size:15px}.pool .search{margin:4px 12px}.filters{padding:0 12px 8px;display:flex;flex-direction:column;gap:6px}.filters select{width:100%}.cat-tabs{display:flex;gap:4px;flex-wrap:wrap}.cat-tab{padding:3px 8px;font-size:12px}.cat-tab.active{background:var(--accent);color:#fff;border-color:var(--accent)}.pool-list{flex:1;overflow-y:auto;padding:4px 12px 12px}.pool-area{margin-bottom:10px}.pool-area-title{font-size:12px;font-weight:600;color:var(--muted);border-bottom:1px solid var(--line);padding-bottom:3px;margin-bottom:6px}.pool-chips{display:flex;flex-wrap:wrap;gap:5px}.chip{display:inline-flex;align-items:center;gap:6px;padding:4px 8px;border-radius:14px;background:#eef1f6;border:1px solid var(--line);font-size:12.5px;cursor:grab;-webkit-user-select:none;user-select:none;touch-action:none}.chip:active{cursor:grabbing}.chip .chip-credit{font-size:11px;color:#fff;background:var(--muted);border-radius:8px;padding:0 5px;min-width:16px;text-align:center}.chip.dragging{opacity:.4}.chip.cat-common{border-left:3px solid var(--common)}.chip.cat-general{border-left:3px solid var(--general)}.chip.cat-career{border-left:3px solid var(--career)}.chip.cat-fusion{border-left:3px solid var(--fusion)}.cat-general .chip-credit{background:var(--general)}.cat-career .chip-credit{background:var(--career)}.cat-fusion .chip-credit{background:var(--fusion)}.drag-overlay{background:#fff;box-shadow:0 6px 18px #0000002e;cursor:grabbing}.pool-foot{display:flex;gap:6px;padding:8px 12px;border-top:1px solid var(--line)}.pool-foot button{flex:1;font-size:12.5px}.add-form{padding:10px 12px;border-top:1px solid var(--line);display:flex;flex-direction:column;gap:6px;background:#fafbfd}.add-form .add-row{display:flex;gap:6px}.add-form .add-row input[list]{flex:1;min-width:0}.add-form .add-row input[type=number]{width:52px}.add-form .add-actions{display:flex;gap:6px}.board{flex:1;min-width:0;display:flex;flex-direction:column}.board-info{padding:8px 16px;border-bottom:1px solid var(--line);background:var(--panel)}.semesters{flex:1;overflow:auto;padding:14px;display:grid;grid-template-columns:repeat(3,minmax(280px,1fr));gap:14px}@media (max-width: 1100px){.semesters{grid-template-columns:repeat(2,minmax(280px,1fr))}}@media (max-width: 760px){.semesters{grid-template-columns:1fr}}.semester{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:10px}.semester-head{display:flex;align-items:center;gap:8px;margin-bottom:8px}.semester-head h3{margin:0;font-size:14px}.sem-total{font-size:12px;color:var(--accent);font-weight:600;margin-left:auto}.add-group{font-size:12px;padding:3px 8px}.empty-sem{color:var(--muted);font-size:12.5px;padding:14px;text-align:center;border:1px dashed var(--line);border-radius:8px}.group{border:1px solid var(--line);border-radius:8px;margin-bottom:10px;overflow:hidden;transition:box-shadow .12s,opacity .12s}.group.slot-over{box-shadow:0 -3px 0 0 var(--accent) inset}.group.group-dragging{opacity:.45}.group-handle{cursor:grab;color:var(--muted);touch-action:none;font-size:13px;-webkit-user-select:none;user-select:none}.group-handle:active{cursor:grabbing}.group-drag-overlay{background:#fff;border:1px solid var(--accent);border-radius:8px;padding:6px 12px;font-weight:600;box-shadow:0 6px 18px #0000002e;cursor:grabbing}.group-head{display:flex;align-items:center;gap:6px;padding:6px 8px;background:#f7f9fc;border-bottom:1px solid var(--line)}.group-name{flex:1;min-width:0;font-weight:600}.choose{display:inline-flex;align-items:center;gap:3px;font-size:12px;color:var(--muted);white-space:nowrap}.choose input{width:44px}.group-del{font-size:11.5px;color:#dc2626;border-color:transparent;background:transparent;padding:2px 4px}.group-del:hover{background:#fdecec}.dropzone{min-height:46px;padding:8px;display:flex;flex-direction:column;gap:5px;transition:background .12s}.dropzone.over{background:#eaf1ff;outline:2px dashed var(--accent);outline-offset:-4px}.drop-hint{color:var(--muted);font-size:12px;text-align:center;padding:8px}.placed{display:flex;align-items:center;gap:6px;padding:4px 6px;background:#fff;border:1px solid var(--line);border-radius:6px}.placed.dragging{opacity:.4}.placed.slot-over{box-shadow:0 -3px 0 0 var(--accent)}.placed.cat-common{border-left:3px solid var(--common)}.placed.cat-general{border-left:3px solid var(--general)}.placed.cat-career{border-left:3px solid var(--career)}.placed.cat-fusion{border-left:3px solid var(--fusion)}.placed-handle{cursor:grab;color:var(--muted);touch-action:none;font-size:13px}.placed-name{flex:1;min-width:0;font-size:13px}.order-btns{display:inline-flex;flex-direction:column;line-height:0}.order-btn{border:none;background:transparent;color:var(--muted);font-size:9px;padding:0 3px;height:11px;line-height:11px}.order-btn:hover:not(:disabled){color:var(--accent);background:transparent}.order-btn:disabled{color:#d4d9e0;cursor:default}.credit-input{width:48px;text-align:center}.credit-input::-webkit-outer-spin-button,.credit-input::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}.credit-input{-moz-appearance:textfield;-webkit-appearance:textfield;appearance:textfield}.placed-x{border:none;background:transparent;color:var(--muted);font-size:16px;line-height:1;padding:0 4px}.placed-x:hover{color:#dc2626;background:transparent}.group-foot{padding:5px 8px;font-size:11.5px;color:var(--muted);border-top:1px solid var(--line);background:#fafbfd}.group-foot b{color:var(--accent)}