.draggable-student{display:flex;align-items:center;gap:.75rem;padding:.75rem;background:var(--bg-secondary);border:2px solid var(--border-color);border-radius:8px;cursor:grab;transition:all .2s;margin-bottom:.5rem}.draggable-student:hover{border-color:#4f46e5;box-shadow:0 2px 8px #4f46e533;transform:translateY(-1px)}.draggable-student:active{cursor:grabbing}.draggable-student.scheduled{opacity:.6;cursor:default}.student-avatar{width:36px;height:36px;border-radius:50%;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:600;font-size:.9rem;flex-shrink:0}.student-info{flex:1;min-width:0}.student-name{font-weight:500;color:var(--text-primary);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.timeslot-dropzone{position:absolute;left:8px;right:8px;background-color:#6366f14d;background:var( --availability-bg, color-mix(in srgb, var(--accent) 34%, transparent) );border-left:4px solid var(--accent, #6366f1);border-radius:6px;padding:.25rem .5rem;transition:all .2s;z-index:1}.timeslot-dropzone:hover{border-color:var(--text-tertiary)}.timeslot-dropzone.drag-over{background-color:#6366f166;background:var( --availability-bg-hover, color-mix(in srgb, var(--accent) 44%, transparent) )}.timeslot-dropzone.has-assignment{background-color:#6366f17a;background:var( --availability-bg-filled, color-mix(in srgb, var(--accent) 50%, transparent) )}.timeslot-label{font-weight:600;color:var(--text-secondary);font-size:.85rem}.timeslot-duration{display:none}.assignment{margin-top:.5rem;padding:.5rem;background:var(--bg-tertiary);border-radius:6px;display:flex;justify-content:space-between;align-items:center}.assignment-student{font-weight:500;color:var(--text-primary);font-size:.9rem}.remove-btn{width:24px;height:24px;padding:0;border-radius:50%;background:var(--bg-secondary);color:var(--text-secondary);font-size:1.2rem;line-height:1;display:flex;align-items:center;justify-content:center;cursor:pointer;border:none}.remove-btn:hover{background:var(--bg-tertiary);transform:scale(1.05)}.drop-indicator{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;color:var(--accent);font-weight:600;font-size:.9rem;pointer-events:none}.preferences-list{margin-top:.5rem;display:flex;flex-direction:column;gap:.25rem}.preference-badge{font-size:.8rem;padding:.25rem 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#764ba2}[data-theme=dark]{--bg-primary: #0f172a;--bg-secondary: #1e293b;--bg-tertiary: #334155;--text-primary: #f1f5f9;--text-secondary: #e2e8f0;--text-tertiary: #94a3b8;--border-color: #334155;--border-color-hover: #475569;--shadow: rgba(0, 0, 0, .3);--gradient-start: #172554;--gradient-end: #4c1d95}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background:var(--bg-primary);color:var(--text-primary);transition:background-color .3s ease,color .3s ease}#root{min-height:100vh}button{cursor:pointer;border:none;border-radius:8px;padding:.75rem 1.5rem;font-size:1rem;font-weight:500;transition:all .2s}button:hover{transform:translateY(-1px);box-shadow:0 4px 12px #0000001a}button:active{transform:translateY(0)}.btn-primary{background:#4f46e5;color:#fff}.btn-primary:hover{background:#4338ca}.btn-secondary{background:#e5e7eb;color:#374151}.btn-secondary:hover{background:#d1d5db}input,select{padding:.75rem;border:1px solid var(--border-color-hover);border-radius:8px;font-size:1rem;width:100%;transition:border-color .2s;background:var(--bg-secondary);color:var(--text-primary)}input:focus,select:focus{outline:none;border-color:#4f46e5;box-shadow:0 0 0 3px #4f46e51a}.card{background:var(--bg-secondary);border-radius:6px;padding:1.5rem;box-shadow:0 1px 3px var(--shadow);transition:background-color .3s ease}