* { margin: 0; padding: 0; box-sizing: border-box; }

        body {
            font-family: 'IBM Plex Sans Arabic', sans-serif;
            background: var(--bg-primary);
            color: var(--text-primary);
            min-height: 100vh;
            line-height: 1.7;
        }

        .scheduler-header {
            background: linear-gradient(135deg, #1a1f35 0%, #0f1424 100%);
            border-bottom: 1px solid var(--border);
            padding: 24px 40px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            position: sticky;
            top: 0;
            z-index: 100;
            backdrop-filter: blur(20px);
        }
        .scheduler-header h1 {
            font-size: 1.4rem;
            font-weight: 700;
            background: linear-gradient(135deg, var(--accent-light), var(--info));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .scheduler-header .subtitle { font-size: 0.85rem; color: var(--text-secondary); margin-top: 2px; }
        .header-badge {
            background: var(--accent-glow);
            border: 1px solid rgba(99,102,241,0.3);
            padding: 8px 16px;
            border-radius: 20px;
            font-size: 0.8rem;
            color: var(--accent-light);
        }

        .main { max-width: 1400px; margin: 0 auto; padding: 32px 40px; }

        .steps { display: flex; gap: 20px; margin-bottom: 32px; }
        .step {
            flex: 1;
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 18px 20px;
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            transition: all 0.3s ease;
        }
        .step.active { border-color: var(--accent); background: var(--accent-glow); }
        .step.done { border-color: var(--success); background: var(--success-bg); }
        .step-num {
            width: 36px; height: 36px;
            border-radius: 50%;
            display: flex; align-items: center; justify-content: center;
            font-weight: 700; font-size: 0.9rem;
            background: var(--border);
            color: var(--text-secondary);
            flex-shrink: 0;
        }
        .step.active .step-num { background: var(--accent); color: #fff; }
        .step.done .step-num { background: var(--success); color: #fff; }
        .step-text { font-size: 0.85rem; color: var(--text-secondary); }
        .step.active .step-text { color: var(--text-primary); }
        .step.done .step-text { color: var(--success); }

        .card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 28px;
            margin-bottom: 24px;
        }
        .card-title {
            font-size: 1.1rem;
            font-weight: 600;
            margin-bottom: 16px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .card-title .icon { font-size: 1.3rem; }

        .upload-zone {
            border: 2px dashed var(--border);
            border-radius: var(--radius);
            padding: 40px;
            text-align: center;
            cursor: pointer;
            transition: all 0.3s ease;
            position: relative;
        }
        .upload-zone:hover, .upload-zone.dragover {
            border-color: var(--accent);
            background: var(--accent-glow);
        }
        .upload-zone.has-file {
            border-color: var(--success);
            background: var(--success-bg);
            border-style: solid;
        }
        .upload-zone input[type="file"] {
            position: absolute;
            inset: 0;
            width: 100%;
            height: 100%;
            opacity: 0;
            cursor: pointer;
            z-index: 50;
        }
        .upload-icon { font-size: 2.5rem; margin-bottom: 12px; pointer-events: none; }
        .upload-text { font-size: 0.95rem; color: var(--text-secondary); pointer-events: none; }
        .upload-text strong { color: var(--accent-light); pointer-events: none; }

        .upload-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }

        .file-list { margin-top: 12px; position: relative; z-index: 60; pointer-events: none; }
        .file-item {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 8px 14px;
            background: var(--bg-secondary);
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            margin-top: 6px;
            font-size: 0.82rem;
            pointer-events: auto;
        }
        .file-item .file-name {
            color: var(--success);
            font-weight: 600;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
            max-width: 300px;
        }
        .file-item .remove-btn {
            background: none;
            border: none;
            color: var(--danger);
            cursor: pointer;
            font-size: 1rem;
            padding: 2px 8px;
            border-radius: 4px;
        }
        .file-item .remove-btn:hover { background: var(--danger-bg); }

        .btn {
            padding: 12px 28px;
            border: none;
            border-radius: var(--radius-sm);
            font-family: inherit;
            font-size: 0.9rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.2s ease;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--accent), #4f46e5);
            color: #fff;
            box-shadow: 0 4px 16px rgba(99,102,241,0.3);
        }
        .btn-primary:hover { transform: translateY(-1px); box-shadow: 0 6px 24px rgba(99,102,241,0.4); }
        .btn-primary:disabled { opacity: 0.4; cursor: not-allowed; transform: none; }
        .btn-secondary {
            background: var(--bg-card-hover);
            color: var(--text-primary);
            border: 1px solid var(--border);
        }
        .btn-secondary:hover { background: var(--border); }
        .btn-success {
            background: linear-gradient(135deg, var(--success), #16a34a);
            color: #fff;
        }
        .btn-group { display: flex; gap: 12px; margin-top: 20px; flex-wrap: wrap; }

        .table-container {
            overflow-x: auto;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border);
            max-height: 600px;
            overflow-y: auto;
        }
        table { width: 100%; border-collapse: collapse; font-size: 0.85rem; }
        th {
            background: var(--bg-secondary);
            padding: 12px 16px;
            text-align: right;
            font-weight: 600;
            color: var(--text-secondary);
            white-space: nowrap;
            border-bottom: 1px solid var(--border);
            position: sticky;
            top: 0;
            z-index: 5;
        }
        td {
            padding: 10px 16px;
            border-bottom: 1px solid rgba(42,54,84,0.5);
            white-space: nowrap;
        }
        tr:hover td { background: var(--bg-card-hover); }
        tr.closed td { color: var(--danger); opacity: 0.5; }

        .pref-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 16px;
        }
        .pref-item {
            background: var(--bg-secondary);
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            padding: 16px;
        }
        .pref-item label {
            display: block;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--text-secondary);
            margin-bottom: 8px;
        }
        .pref-item input, .pref-item select, .pref-item textarea {
            width: 100%;
            padding: 10px 14px;
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            color: var(--text-primary);
            font-family: inherit;
            font-size: 0.85rem;
            transition: border-color 0.2s;
        }
        .pref-item input:focus, .pref-item select:focus, .pref-item textarea:focus {
            outline: none;
            border-color: var(--accent);
        }
        .pref-item textarea { resize: vertical; min-height: 60px; }

        .stats-row { display: flex; gap: 16px; margin-bottom: 24px; flex-wrap: wrap; }
        .stat-card {
            flex: 1;
            min-width: 130px;
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            padding: 16px 20px;
            text-align: center;
        }
        .stat-value {
            font-size: 1.8rem;
            font-weight: 700;
            background: linear-gradient(135deg, var(--accent-light), var(--info));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .stat-label { font-size: 0.78rem; color: var(--text-secondary); margin-top: 4px; }

        .tag {
            display: inline-block;
            padding: 3px 10px;
            border-radius: 12px;
            font-size: 0.72rem;
            font-weight: 600;
        }
        .tag-open { background: var(--success-bg); color: var(--success); border: 1px solid rgba(34,197,94,0.3); }
        .tag-closed { background: var(--danger-bg); color: var(--danger); border: 1px solid rgba(239,68,68,0.3); }
        .tag-source { background: var(--info-bg); color: var(--info); border: 1px solid rgba(6,182,212,0.3); }

        .section { display: none; }
        .section.visible { display: block; animation: fadeIn 0.4s ease; }

        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(10px); }
            to { opacity: 1; transform: translateY(0); }
        }

        .toast {
            position: fixed;
            bottom: 24px;
            left: 50%;
            transform: translateX(-50%) translateY(100px);
            background: var(--bg-card);
            border: 1px solid var(--border);
            padding: 14px 24px;
            border-radius: var(--radius-sm);
            font-size: 0.85rem;
            z-index: 1000;
            box-shadow: var(--shadow);
            transition: transform 0.3s ease, opacity 0.3s ease;
            opacity: 0;
            pointer-events: none;
            display: none;
        }
        .toast.show {
            display: block;
            opacity: 1;
            pointer-events: auto;
            transform: translateX(-50%) translateY(0);
        }

        .filter-bar {
            display: flex;
            gap: 12px;
            margin-bottom: 16px;
            flex-wrap: wrap;
            align-items: center;
        }
        .filter-bar input[type="search"] {
            flex: 1;
            min-width: 200px;
            padding: 10px 16px;
            background: var(--bg-secondary);
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            color: var(--text-primary);
            font-family: inherit;
            font-size: 0.85rem;
        }
        .filter-bar input:focus { outline: none; border-color: var(--accent); }
        .filter-bar select {
            padding: 10px 14px;
            background: var(--bg-secondary);
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            color: var(--text-primary);
            font-family: inherit;
            font-size: 0.82rem;
            cursor: pointer;
        }

        .export-area {
            background: var(--bg-secondary);
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            padding: 16px;
            margin-top: 16px;
        }
        .export-area textarea {
            width: 100%;
            min-height: 120px;
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            color: var(--text-primary);
            font-family: monospace;
            font-size: 0.8rem;
            padding: 12px;
            direction: ltr;
            resize: vertical;
        }

        .needed-list {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
            gap: 16px;
            margin-top: 16px;
        }
        .needed-item {
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            gap: 12px;
            padding: 16px;
            background: #131828;
            border: 1px solid var(--border);
            border-radius: 12px;
            font-size: 0.85rem;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
            transition: all 0.2s ease;
        }
        .needed-item:hover {
            border-color: rgba(99, 102, 241, 0.4);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
        }
        .needed-item.completed {
            opacity: 0.5;
            background: rgba(15, 23, 42, 0.4);
        }
        .needed-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 8px;
        }
        .needed-item .code {
            font-weight: 800;
            font-size: 0.9rem;
            color: var(--accent-light);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .needed-item .status-dot {
            width: 10px; height: 10px;
            border-radius: 50%;
            display: inline-block;
            flex-shrink: 0;
        }
        .needed-item .status-dot.done { background: var(--success); box-shadow: 0 0 8px var(--success); }
        .needed-item .status-dot.pending { background: var(--warning); box-shadow: 0 0 8px var(--warning); }
        .needed-item .status-dot.available { background: var(--info); box-shadow: 0 0 8px var(--info); }

        .needed-body {
            display: flex;
            flex-direction: column;
            gap: 4px;
        }
        .needed-body .course-title {
            font-size: 0.98rem;
            font-weight: 700;
            color: var(--text-primary);
            line-height: 1.4;
        }
        .needed-body .course-meta {
            font-size: 0.78rem;
            color: var(--text-secondary);
        }
        .needed-prereqs {
            background: rgba(0, 0, 0, 0.3);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: 8px;
            padding: 8px 12px;
            font-size: 0.78rem;
            color: var(--text-secondary);
        }
        .prereq-label {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 6px;
        }
        .prereq-pill {
            display: inline-flex;
            align-items: center;
            padding: 2px 8px;
            border-radius: 6px;
            font-size: 0.72rem;
            font-weight: 600;
        }
        .prereq-pill.done {
            background: rgba(76, 175, 80, 0.15);
            color: #81c784;
            border: 1px solid rgba(76, 175, 80, 0.3);
        }
        .prereq-pill.pending {
            background: rgba(239, 68, 68, 0.15);
            color: #ef5350;
            border: 1px solid rgba(239, 68, 68, 0.3);
        }

        .info-box {
            background: var(--info-bg);
            border: 1px solid rgba(6,182,212,0.3);
            border-radius: var(--radius-sm);
            padding: 14px 18px;
            font-size: 0.85rem;
            color: var(--info);
            margin-bottom: 16px;
            display: flex;
            align-items: flex-start;
            gap: 10px;
        }
        .info-box .info-icon { font-size: 1.2rem; flex-shrink: 0; }

        @media (max-width: 768px) {
            .scheduler-header { padding: 16px 20px; flex-direction: column; gap: 12px; }
            .main { padding: 90px 12px 20px !important; }
            .steps { flex-direction: column; gap: 8px; }
            .upload-grid { grid-template-columns: 1fr; }
            .pref-grid { grid-template-columns: 1fr; }
            .stats-row { flex-direction: column; }
            .needed-list {
                grid-template-columns: 1fr !important;
                gap: 12px;
                margin-top: 12px;
            }
            .needed-item {
                padding: 12px 14px;
                gap: 10px;
            }
            .needed-body .course-title {
                font-size: 0.9rem;
            }
            .needed-item .code {
                font-size: 0.85rem;
            }
        }