/* CSS Reset en Variabelen */
    :root {
        /* Kleurenschema - Light Mode */
        --bg-color: #ffffff;
        --text-color: #1a1a1a;
        --seat-bg: #f5f8fa;
        --seat-border: #e1e8ed;
        --button-bg: #017dbf;
        --button-hover: #0169a2;
        --button-text: white;
        --group-bg: rgba(1, 125, 191, 0.08);
        --error-color: #dc3545;
        --success-color: #0192dd;
        --warning-color: #ffc107;
        
        /* Spacing */
        --spacing-xs: 4px;
        --spacing-sm: 8px;
        --spacing-md: 16px;
        --spacing-lg: 24px;
        --spacing-xl: 32px;
        
        /* Border Radius */
        --border-radius-sm: 4px;
        --border-radius-md: 8px;
        --border-radius-lg: 16px;
        
        /* Transitions */
        --transition-speed: 0.3s;
        --container-bg: rgba(255, 255, 255, 0.9);
        --input-bg: #ffffff;
        --input-border: #e1e8ed;
        --input-text: #1a1a1a;
        --bg-pattern: rgba(1, 125, 191, 0.05);
    }

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

    body {
        font-family: 'Figtree', system-ui, -apple-system, sans-serif;
        max-width: 1200px;
        margin: 0 auto;
        padding: var(--spacing-md);
        background-color: var(--bg-color);
        color: var(--text-color);
        line-height: 1.5;
        transition: background-color var(--transition-speed), color var(--transition-speed);
        background-image: linear-gradient(45deg, var(--bg-color) 85%, var(--bg-pattern) 85%);
        background-size: 4px 4px;
        min-height: 100vh;
        background-attachment: fixed;
    }

    /* Container styles */
    .container {
        max-width: 1200px;
        margin: 0 auto;
        padding: var(--spacing-xl);
        background-color: var(--bg-color);
        border-radius: var(--border-radius-lg);
        box-shadow: 0 0 40px rgba(0, 0, 0, 0.1);
        position: relative;
        z-index: 1;
    }

    /* Header Styles */
    header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin-bottom: var(--spacing-md);
        position: relative;
    }

    .header-content {
        display: flex;
        align-items: center;
        gap: var(--spacing-md);
    }

    .logo {
        width: 48px;
        height: 48px;
        object-fit: contain;
        cursor: pointer;
        transition: transform var(--transition-speed);
    }

    .logo:hover {
        transform: scale(1.05);
    }

    h1 {
        font-size: 1.7rem;
        font-weight: 600;
        background: linear-gradient(45deg, var(--button-bg), var(--button-hover));
        -webkit-background-clip: text;
        background-clip: text;
        -webkit-text-fill-color: transparent;
        text-align: left;
        margin: 0;
    }

    h2 {
        font-size: 1.1rem;
        font-weight: 600;
        position: relative;
        padding-left: var(--spacing-md);
    }

    h2::before {
        content: '';
        position: absolute;
        left: 0;
        top: 50%;
        transform: translateY(-50%);
        width: 4px;
        height: 1em;
        background-color: var(--button-bg);
        border-radius: var(--border-radius-sm);
    }

    .seating-rules {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-md);
        margin-bottom: var(--spacing-md);
    }

/* Styles voor lijstbeheer */
    .list-management {
        margin-bottom: var(--spacing-xl);
        padding: var(--spacing-md);
        border: 1px solid var(--seat-border);
        border-radius: var(--border-radius-md);
        background-color: var(--bg-color);
        transition: background-color var(--transition-speed), border-color var(--transition-speed);
        position: relative;
        z-index: 1;
    }

    .list-management-header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        cursor: pointer;
        padding: var(--spacing-sm);
    }

    .collapse-toggle {
        background: none;
        border: none;
        color: var(--text-color);
        cursor: pointer;
        padding: var(--spacing-sm);
    }

    .collapse-toggle .arrow {
        display: inline-block;
        transition: transform var(--transition-speed);
    }

    .list-management.collapsed .collapse-toggle .arrow {
        transform: rotate(-90deg);
    }

    .list-management-content {
        max-height: 500px;
        overflow: hidden;
        transition: max-height var(--transition-speed);
    }

    .list-management.collapsed .list-management-content {
        max-height: 0;
    }

    .list-controls {
        display: flex;
        gap: var(--spacing-md);
        margin-bottom: var(--spacing-md);
        flex-wrap: wrap;
    }

    .list-select {
        flex: 1;
        min-width: 200px;
        padding: var(--spacing-sm);
        border: 1px solid var(--seat-border);
        border-radius: var(--border-radius-sm);
        background-color: var(--seat-bg);
        color: var(--text-color);
    }

    .save-list-form {
        display: flex;
        gap: var(--spacing-md);
        margin-top: var(--spacing-md);
        align-items: center;
    }

    .save-list-form input {
        flex: 1;
        padding: var(--spacing-sm);
        border: 1px solid var(--seat-border);
        border-radius: var(--border-radius-sm);
        background-color: var(--seat-bg);
        color: var(--text-color);
    }

    /* Action buttons row */
    .controls {
        display: flex;
        gap: var(--spacing-sm);
        flex-wrap: wrap;
        align-items: center;
        margin-bottom: var(--spacing-md);
    }

    /* Button Styles */
    .button {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        padding: 6px var(--spacing-md);
        border: none;
        border-radius: var(--border-radius-md);
        font-size: 0.875rem;
        font-weight: 500;
        cursor: pointer;
        transition: background-color var(--transition-speed), color var(--transition-speed), transform var(--transition-speed), box-shadow var(--transition-speed), opacity var(--transition-speed);
        min-height: 34px;
        gap: var(--spacing-xs);
        position: relative;
        overflow: hidden;
    }

    .button::after {
        content: '';
        position: absolute;
        top: 50%;
        left: 50%;
        width: 120%;
        height: 120%;
        background: radial-gradient(circle, rgba(255,255,255,0.2) 0%, rgba(255,255,255,0) 70%);
        transform: translate(-50%, -50%) scale(0);
        opacity: 0;
        transition: transform 0.3s ease, opacity 0.3s ease;
    }

    .button:hover::after {
        transform: translate(-50%, -50%) scale(1);
        opacity: 1;
    }

    .button:disabled {
        opacity: 0.6;
        cursor: not-allowed;
    }

    .button-primary {
        background-color: var(--button-bg);
        color: var(--button-text);
        font-weight: 600;
        padding: 6px var(--spacing-lg);
    }

    .button-primary:hover:not(:disabled) {
        background-color: var(--button-hover);
        transform: translateY(-1px);
        box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    }

    .button-secondary {
        background-color: var(--seat-bg);
        color: var(--text-color);
        border: 1px solid var(--seat-border);
        font-weight: 500;
    }

    .button-secondary:hover:not(:disabled) {
        background-color: var(--group-bg);
        transform: translateY(-1px);
        box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    }

    .button-danger {
        background-color: var(--error-color);
        color: white;
    }

    .button-danger:hover:not(:disabled) {
        background-color: #cc0000;
        transform: translateY(-1px);
        box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    }

    /* Form Elements */
    textarea, input {
        width: 100%;
        padding: var(--spacing-sm);
        border: 1px solid var(--seat-border);
        border-radius: var(--border-radius-md);
        background-color: var(--seat-bg);
        color: var(--text-color);
        font-family: inherit;
        font-size: 0.9rem;
        line-height: 1.5;
        transition: border-color var(--transition-speed);
        margin-bottom: var(--spacing-md);
    }

    textarea {
        min-height: 120px;
        resize: vertical;
    }

    textarea:focus, input:focus {
        outline: none;
        border-color: var(--button-bg);
        box-shadow: 0 0 0 2px rgba(76, 175, 80, 0.2);
    }

    .form-group {
        margin-bottom: var(--spacing-sm);
    }

    .form-group label {
        display: block;
        margin-bottom: 4px;
        font-weight: 500;
        font-size: 0.875rem;
    }
/* Tab Styling */
    .tabs {
        margin-bottom: var(--spacing-lg);
        border-bottom: 1px solid var(--seat-border);
        background-color: var(--seat-bg);
        border-radius: var(--border-radius-md) var(--border-radius-md) 0 0;
        padding: var(--spacing-sm) var(--spacing-sm) 0 var(--spacing-sm);
    }

    .tab-list {
        display: flex;
        gap: var(--spacing-sm);
        list-style: none;
        padding: 0;
        margin: 0;
        flex-wrap: wrap;
    }

    .tab-button {
        padding: var(--spacing-sm) var(--spacing-md);
        background: none;
        border: none;
        border-bottom: 2px solid transparent;
        color: var(--text-color);
        cursor: pointer;
        font-size: 0.875rem;
        font-weight: 500;
        transition: background-color var(--transition-speed), color var(--transition-speed), border-bottom-color var(--transition-speed), opacity var(--transition-speed);
        opacity: 0.7;
    }

    .tab-button:hover {
        background-color: var(--group-bg);
    }

    .tab-button.active {
        border-bottom-color: var(--button-bg);
        color: var(--button-bg);
        opacity: 1;
        font-weight: 600;
    }

    .tab-content {
        display: none;
    }

    .tab-content.active {
        display: block;
        animation: fadeIn 0.25s ease-in-out;
    }

    @keyframes fadeIn {
        from { opacity: 0; transform: translateY(4px); }
        to   { opacity: 1; transform: translateY(0); }
    }

    /* Seating Layout Styles */
    .layout-container {
        margin-bottom: var(--spacing-xl);
        border: 1px solid var(--seat-border);
        border-radius: var(--border-radius-lg);
        padding: var(--spacing-lg);
        background-color: var(--bg-color);
        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
        position: relative;
        z-index: 1;
        overflow-x: auto; /* Zorgt voor scrollen bij extreme breedte */
    }

    .layout-container h3 {
        margin-bottom: var(--spacing-lg);
        padding-bottom: var(--spacing-sm);
        border-bottom: 1px solid var(--seat-border);
    }

    .seating-plan {
        display: flex;
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .row-container {
        display: flex;
        flex-direction: column;
        gap: var(--spacing-md);
        margin-bottom: var(--spacing-sm);
    }

    .group-container {
        display: flex;
        gap: var(--spacing-md);
        justify-content: space-between;
    }

    .seat-group {
        display: flex;
        gap: var(--spacing-sm);
        background-color: var(--group-bg);
        padding: var(--spacing-md);
        border-radius: var(--border-radius-md);
        transition: transform 0.3s ease, box-shadow 0.3s ease;
        box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    }

    .seat-group:hover {
        transform: translateY(-2px);
        box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    }

    .seat {
        position: relative;
        min-width: 100px;
        min-height: 60px;
        padding: var(--spacing-sm);
        background-color: var(--seat-bg);
        border: 1px solid var(--seat-border);
        border-radius: var(--border-radius-sm);
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        transition: transform var(--transition-speed), box-shadow var(--transition-speed), background-color var(--transition-speed);
        cursor: move;
        user-select: none;
        font-weight: 500;
        box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    }

    .seat.dragging {
        opacity: 0.7;
        transform: scale(1.05);
        box-shadow: 0 8px 16px rgba(0,0,0,0.2);
        z-index: 1000;
    }

    .seat:hover {
        transform: translateY(-2px);
        box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        background-color: var(--seat-bg);
        z-index: 1;
    }

    .seat.drag-over {
        background-color: var(--button-bg);
        color: var(--button-text);
        transform: scale(1.05);
        box-shadow: 0 0 0 2px var(--button-bg);
    }

    .seat-number {
        position: absolute;
        top: 2px;
        left: 2px;
        font-size: 0.65rem;
        font-weight: 600;
        background-color: var(--button-bg);
        color: var(--button-text);
        padding: 1px 3px;
        border-radius: 3px;
        opacity: 0.8;
    }

    /* Teacher Desk Styles */
    .teacher-desk {
        display: flex;
        justify-content: center;
        margin-bottom: var(--spacing-md);
        padding: var(--spacing-lg) 0;
    }

    .teacher-seat {
        width: 200px;
        min-height: 60px;
        padding: var(--spacing-sm);
        background-color: var(--seat-bg);
        border: 1px solid var(--seat-border);
        border-radius: var(--border-radius-sm);
        display: flex;
        align-items: center;
        justify-content: center;
        font-weight: bold;
    }

    /* Notification System */
    .notification-container {
        position: fixed;
        top: var(--spacing-lg);
        right: var(--spacing-lg);
        z-index: 1000;
        display: flex;
        flex-direction: column;
        gap: var(--spacing-sm);
        max-width: 300px;
    }

    .notification {
        padding: var(--spacing-md);
        border-radius: var(--border-radius-md);
        background-color: var(--seat-bg);
        color: var(--text-color);
        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
        display: flex;
        align-items: center;
        gap: var(--spacing-sm);
        animation: slideIn 0.3s ease-out;
    }

    @keyframes slideIn {
        from {
            transform: translateX(100%);
            opacity: 0;
        }
        to {
            transform: translateX(0);
            opacity: 1;
        }
    }

    /* Fixed Seats & Separated Pairs Sections */
    .fixed-seats-section, .separated-pairs-section {
        background-color: var(--bg-color);
        padding: var(--spacing-md);
        border-radius: var(--border-radius-md);
        position: relative;
        z-index: 1;
        border: 1px solid var(--seat-border);
    }

    .fixed-seat-input, .separated-pair-input {
        display: flex;
        gap: var(--spacing-sm);
        margin-bottom: var(--spacing-sm);
        align-items: center;
    }

    .fixed-seat-input input, .separated-pair-input input {
        padding: var(--spacing-sm);
        border: 1px solid var(--seat-border);
        border-radius: var(--border-radius-sm);
        background-color: var(--seat-bg);
        color: var(--text-color);
    }

    .fixed-seat-input input[type="text"] {
        flex: 1;
    }

    .separated-pair-input input {
        flex: 1;
    }

    .fixed-seat-input input[type="number"] {
        width: 80px;
    }
    
    .separated-pair-input .separator {
        font-weight: bold;
    }

    /* Custom Layout Controls */
    .custom-layout-controls {
        display: flex;
        gap: var(--spacing-md);
        align-items: flex-end;
        margin-bottom: var(--spacing-md);
        flex-wrap: wrap;
    }

    .custom-layout-controls .form-group {
        flex: 1;
        min-width: 150px;
    }
    
    .custom-layout-controls button {
        margin-bottom: var(--spacing-lg); /* Align with input fields */
    }

    /* Responsive Design */
    @media (max-width: 900px) {
        .seating-rules {
            grid-template-columns: 1fr;
        }
    }
    
    @media (max-width: 768px) {
        body {
            padding: var(--spacing-sm);
        }

        .container {
            padding: var(--spacing-md);
        }

        .list-controls, .save-list-form, .fixed-seat-input, .separated-pair-input {
            flex-direction: column;
            align-items: stretch;
            width: 100%;
        }

        .save-list-form input, .list-select, .fixed-seat-input input, .separated-pair-input input {
            width: 100%;
        }

        .button:not(.remove-fixed):not(.remove-separated-pair) {
            width: 100%;
            margin-bottom: var(--spacing-sm);
        }

        .logo {
            width: 40px;
            height: 40px;
        }

        h1 {
            font-size: 1.8rem;
        }
    }

    /* Responsive adjustments for wide layouts */
    .seating-plan.wide-layout .group-container {
        justify-content: center; /* Plaats de groepen in het midden */
        gap: var(--spacing-sm); /* Verklein de ruimte TUSSEN de groepen */
    }

    .seating-plan.wide-layout .seat-group {
        gap: var(--spacing-xs); /* Verklein de ruimte IN een groep */
        padding: var(--spacing-sm); /* Verklein de opvulling van een groep */
    }

    .seating-plan.wide-layout .seat {
        min-width: 75px; /* Maak de stoeltjes (tafels) smaller */
        min-height: 50px;
        font-size: 0.8rem; /* Maak de tekst iets kleiner */
        padding: var(--spacing-xs);
    }

    .seating-plan.wide-layout .seat-number {
        font-size: 0.6rem;
    }

/* ─── Vrije Opstelling (Freeform) ─────────────────────────────────────── */

.freeform-toolbar {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--group-bg);
    border-radius: var(--border-radius-md);
}

.freeform-hint-text {
    font-size: 0.85rem;
    color: #666;
    flex: 1;
}

.freeform-canvas {
    position: relative;
    min-height: 520px;
    border: 2px dashed var(--seat-border);
    border-radius: var(--border-radius-md);
    background: var(--seat-bg);
    overflow: auto;
}

.freeform-stage {
    position: relative;
    min-width: 100%;
    min-height: 100%;
    transform-origin: top left;
}

.zoom-controls {
    display: flex;
    align-items: center;
    gap: 2px;
    background: var(--seat-bg);
    border: 1px solid var(--seat-border);
    border-radius: var(--border-radius-md);
    padding: 2px 4px;
}

.zoom-btn {
    padding: 2px 8px !important;
    min-height: 26px !important;
    font-size: 1rem !important;
    border: none !important;
    background: transparent !important;
    box-shadow: none !important;
}

.zoom-btn:hover:not(:disabled) {
    background: var(--group-bg) !important;
    transform: none !important;
    box-shadow: none !important;
}

.zoom-label {
    font-size: 0.78rem;
    font-weight: 600;
    min-width: 36px;
    text-align: center;
    color: var(--text-color);
}

.freeform-empty-hint {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: #999;
    font-size: 1rem;
    text-align: center;
    pointer-events: none;
    white-space: nowrap;
}

.freeform-group {
    position: absolute;
    background: var(--bg-color);
    border: 1px solid var(--seat-border);
    border-radius: var(--border-radius-md);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    min-width: 150px;
    user-select: none;
    transition: box-shadow 0.15s;
}

.freeform-group.dragging-group {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
    z-index: 10;
    opacity: 0.92;
}

.freeform-group-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 5px 8px;
    background: var(--button-bg);
    color: white;
    border-radius: var(--border-radius-md) var(--border-radius-md) 0 0;
}

.drag-handle {
    cursor: grab;
    font-size: 1.1rem;
    line-height: 1;
    opacity: 0.85;
    flex-shrink: 0;
}

.drag-handle:active {
    cursor: grabbing;
}

.group-label {
    flex: 1;
    font-weight: 600;
    font-size: 0.82rem;
    white-space: nowrap;
}

.group-controls {
    display: flex;
    align-items: center;
    gap: 4px;
}

.group-shape-select {
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.35);
    color: white;
    border-radius: var(--border-radius-sm);
    font-size: 0.78rem;
    padding: 2px 4px;
    cursor: pointer;
    max-width: 68px;
}

.group-shape-select:focus {
    outline: none;
    background: rgba(255, 255, 255, 0.28);
}

.group-shape-select optgroup,
.group-shape-select option {
    color: var(--text-color);
    background: var(--bg-color);
}

.group-seats-btn {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    cursor: pointer;
    border-radius: var(--border-radius-sm);
    width: 22px;
    height: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    line-height: 1;
    padding: 0;
    transition: background 0.15s;
    flex-shrink: 0;
}

.group-seats-btn:hover {
    background: rgba(255, 255, 255, 0.35);
}

.freeform-group-seats {
    padding: var(--spacing-sm);
    display: grid;
    gap: var(--spacing-xs);
    /* grid-template-columns is set inline per group */
}

.freeform-group-seats .seat {
    min-width: 0;
    cursor: grab;
}

/* ─── Help button & overlay ────────────────────────────────────────────── */

.help-btn {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: none;
    background: var(--button-bg);
    color: white;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: background var(--transition-speed), transform var(--transition-speed);
}

.help-btn:hover {
    background: var(--button-hover);
    transform: scale(1.08);
}

.help-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.45);
    z-index: 2000;
    display: flex;
    align-items: flex-start;
    justify-content: flex-end;
    padding: 56px 24px 24px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
}

.help-overlay.visible {
    opacity: 1;
    pointer-events: all;
}

.help-panel {
    background: var(--bg-color);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2);
    width: 340px;
    max-height: 82vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transform: translateY(-8px);
    transition: transform 0.2s ease;
}

.help-overlay.visible .help-panel {
    transform: translateY(0);
}

.help-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid var(--seat-border);
    flex-shrink: 0;
}

.help-header h2 {
    font-size: 1rem;
    font-weight: 600;
    padding-left: 0;
    margin: 0;
}

.help-header h2::before {
    display: none;
}

.help-close {
    background: none;
    border: none;
    font-size: 1rem;
    cursor: pointer;
    color: #888;
    padding: 4px;
    line-height: 1;
    border-radius: var(--border-radius-sm);
    transition: color 0.15s, background 0.15s;
}

.help-close:hover {
    color: var(--text-color);
    background: var(--seat-bg);
}

.help-body {
    overflow-y: auto;
    padding: 8px 0;
}

.help-section {
    padding: 12px 20px;
    border-bottom: 1px solid var(--seat-border);
}

.help-section:last-child {
    border-bottom: none;
}

.help-section h3 {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.help-section p {
    font-size: 0.82rem;
    line-height: 1.5;
    color: #555;
}

.help-section p kbd {
    display: inline-block;
    background: var(--seat-bg);
    border: 1px solid var(--seat-border);
    border-radius: 4px;
    padding: 0 5px;
    font-size: 0.75rem;
    font-family: inherit;
}

@media (max-width: 768px) {
    .help-overlay {
        align-items: flex-end;
        justify-content: stretch;
        padding: 0;
    }

    .help-panel {
        width: 100%;
        max-height: 70vh;
        border-radius: var(--border-radius-lg) var(--border-radius-lg) 0 0;
    }
}