/* Number Quest Styling */

:root {
    /* Theme colors - Light mode defaults */
    --nq-bg: #f8f9fa;
    --nq-card: #ffffff;
    --nq-border: #dee2e6;
    --nq-text: #212529;
    --nq-text-muted: #6c757d;
    --nq-primary: #0d6efd;
    
    /* Operators styling */
    --nq-op-bg: #e9ecef;
    --nq-op-border: #ced4da;
    --nq-op-text: #495057;
    --nq-op-hover: #dee2e6;
    --nq-op-selected: #0d6efd;
    --nq-op-selected-text: #ffffff;
    
    /* Soft pastel number node colors (Good in light mode) */
    --nq-color-red: #ff8787;
    --nq-color-yellow: #ffe066;
    --nq-color-green: #8ce99a;
    --nq-color-blue: #74c0fc;
    --nq-color-purple: #b197fc;
    --nq-color-pink: #faa2c1;
    --nq-color-teal: #66d9e8;
    --nq-node-text: #212529;

    --nq-board-size: 380px;
    --nq-node-size: 50px;
    --nq-op-size: 32px;
}

/* Automatic switch to Dark Mode based on body classes or system themes */
body.dark-mode,
body.bootscore-dark-theme,
body.dark,
[data-bs-theme="dark"] body {
    --nq-bg: #1e1e1e;
    --nq-card: #2d2d2d;
    --nq-border: #444444;
    --nq-text: #f8f9fa;
    --nq-text-muted: #adb5bd;
    --nq-primary: #375a7f;
    
    --nq-op-bg: #3c3c3c;
    --nq-op-border: #555555;
    --nq-op-text: #e0e0e0;
    --nq-op-hover: #4e4e4e;
    
    /* Dark mode optimized soft colors */
    --nq-color-red: #c92a2a;
    --nq-color-yellow: #f59f00;
    --nq-color-green: #2b8a3e;
    --nq-color-blue: #1c7ed6;
    --nq-color-purple: #6741d9;
    --nq-color-pink: #d6336c;
    --nq-color-teal: #0c8599;
    --nq-node-text: #ffffff;
}

/* App Container */
.nq-container {
    max-width: 500px;
    margin: 2rem auto;
    padding: 1.5rem;
    background-color: var(--nq-bg);
    border: 1px solid var(--nq-border);
    border-radius: 16px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
    font-family: 'Outfit', 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    user-select: none;
    -webkit-user-select: none;
}

/* Target Header Banner */
.nq-target-banner {
    background-color: var(--nq-card);
    border: 1px solid var(--nq-border);
    border-radius: 12px;
    padding: 1rem;
    text-align: center;
    margin-bottom: 2rem;
}
.nq-target-title {
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--nq-text);
    margin: 0;
}
.nq-target-difficulty {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--nq-text-muted);
    font-weight: 600;
    margin-top: 0.25rem;
}

/* Game Board container */
.nq-board-wrapper {
    position: relative;
    width: var(--nq-board-size);
    height: var(--nq-board-size);
    margin: 0 auto;
}

/* SVG connection lines layer */
.nq-svg-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    pointer-events: none;
}

/* HTML nodes layer */
.nq-nodes-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2;
}

/* Base Node Styles */
.nq-node {
    position: absolute;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: transform 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275), opacity 0.3s ease;
    box-sizing: border-box;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

/* Number Node Specifics */
.nq-number-node {
    width: var(--nq-node-size);
    height: var(--nq-node-size);
    margin-top: calc(var(--nq-node-size) / -2);
    margin-left: calc(var(--nq-node-size) / -2);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--nq-node-text);
    border: 2px solid transparent;
    cursor: default;
}
.nq-number-node.selected {
    transform: scale(1.15);
    box-shadow: 0 0 15px rgba(13, 110, 253, 0.5);
    border-color: var(--nq-primary);
}

/* Operator Node Specifics */
.nq-operator-node {
    width: var(--nq-op-size);
    height: var(--nq-op-size);
    margin-top: calc(var(--nq-op-size) / -2);
    margin-left: calc(var(--nq-op-size) / -2);
    font-size: 1.1rem;
    font-weight: 600;
    background-color: var(--nq-op-bg);
    border: 1.5px solid var(--nq-op-border);
    color: var(--nq-op-text);
    z-index: 3;
}
.nq-operator-node:hover {
    background-color: var(--nq-op-hover);
}
.nq-operator-node.highlighted {
    background-color: var(--nq-primary);
    border-color: var(--nq-primary);
    color: #ffffff;
    box-shadow: 0 0 10px var(--nq-primary);
}
.nq-operator-node.selected {
    transform: scale(1.1);
    background-color: var(--nq-op-selected);
    color: var(--nq-op-selected-text);
    border-color: var(--nq-op-selected);
}

/* Colors styling mapping */
.nq-bg-red { background-color: var(--nq-color-red); }
.nq-bg-yellow { background-color: var(--nq-color-yellow); }
.nq-bg-green { background-color: var(--nq-color-green); }
.nq-bg-blue { background-color: var(--nq-color-blue); }
.nq-bg-purple { background-color: var(--nq-color-purple); }
.nq-bg-pink { background-color: var(--nq-color-pink); }
.nq-bg-teal { background-color: var(--nq-color-teal); }

/* Dim/Fade state during selection */
.nq-node.dimmed, .nq-operator-node.dimmed {
    opacity: 0.25 !important;
    pointer-events: none;
}

/* Bottom Selector Bar (Options bar for Subtraction and Division) */
.nq-options-bar {
    display: none;
    flex-direction: column;
    gap: 0.5rem;
    margin-top: 2rem;
    animation: slideUp 0.3s cubic-bezier(0.19, 1, 0.22, 1);
}
.nq-option-btn {
    background-color: #0040ff;
    color: #ffffff;
    border: none;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
    text-align: center;
}
.nq-option-btn:hover {
    background-color: #0033cc;
}
.nq-cancel-btn {
    background-color: var(--nq-op-bg);
    color: var(--nq-op-text);
    border: 1px solid var(--nq-border);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
    text-align: center;
}
.nq-cancel-btn:hover {
    background-color: var(--nq-op-hover);
}

/* Control Buttons & Score */
.nq-bottom-controls {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-top: 1.5rem;
}
.nq-undo-counter {
    font-size: 0.95rem;
    color: var(--nq-text-muted);
    font-weight: 600;
}
.nq-action-row {
    display: flex;
    gap: 0.5rem;
}
.nq-btn {
    flex: 1;
    background-color: var(--nq-op-bg);
    color: var(--nq-op-text);
    border: 1px solid var(--nq-border);
    padding: 0.6rem 1rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}
.nq-btn:hover {
    background-color: var(--nq-op-hover);
}
.nq-btn-restart {
    flex: 2;
}

/* Hint Mode Widget */
.nq-hint-section {
    margin-top: 1rem;
    border-top: 1px dashed var(--nq-border);
    padding-top: 1rem;
}
.nq-hint-btn {
    background: none;
    border: none;
    color: var(--nq-primary);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    padding: 0;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}
.nq-hint-steps {
    display: none;
    margin-top: 0.5rem;
    background-color: var(--nq-card);
    border: 1px solid var(--nq-border);
    border-radius: 8px;
    padding: 0.75rem;
}
.nq-hint-step {
    font-size: 0.95rem;
    color: var(--nq-text);
    padding: 0.25rem 0;
    border-bottom: 1px solid var(--nq-bg);
}
.nq-hint-step:last-child {
    border-bottom: none;
}

/* Modal and popups */
.nq-win-popup {
    display: none;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.9);
    background-color: var(--nq-card);
    border: 2px solid var(--nq-border);
    border-radius: 16px;
    padding: 2rem;
    z-index: 1000;
    box-shadow: 0 10px 40px rgba(0,0,0,0.25);
    text-align: center;
    width: 320px;
}
.nq-win-popup.show {
    display: block;
    animation: popIn 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}
.nq-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 999;
}
.nq-overlay.show {
    display: block;
}

@keyframes slideUp {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

@keyframes popIn {
    from { transform: translate(-50%, -50%) scale(0.8); opacity: 0; }
    to { transform: translate(-50%, -50%) scale(1); opacity: 1; }
}

/* Mobile responsive sizing adjustments */
@media(max-width: 480px) {
    :root {
        --nq-board-size: 320px;
        --nq-node-size: 44px;
        --nq-op-size: 28px;
    }
    .nq-container {
        padding: 1rem;
        margin: 1rem auto;
    }
}

/* Stacked Fractions and Layouts inside Nodes */
.nq-fraction {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    line-height: 1;
    font-size: 1.05rem;
    font-family: inherit;
    width: 100%;
    height: 100%;
}
.nq-fraction .nq-numerator {
    border-bottom: 1.5px solid var(--nq-node-text);
    padding: 0 3px;
    font-weight: 700;
}
.nq-fraction .nq-denominator {
    padding: 0 3px;
    font-weight: 700;
}

/* Mixed fraction layout: [Integer] [Numerator / Denominator] */
.nq-mixed {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: 2px;
    font-size: 1.05rem;
    width: 100%;
    height: 100%;
}
.nq-mixed .nq-integer {
    font-weight: 700;
}
.nq-mixed .nq-frac-part {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    line-height: 1;
}
.nq-mixed .nq-frac-part .nq-numerator {
    border-bottom: 1px solid var(--nq-node-text);
    padding: 0 1px;
    font-weight: 700;
}
.nq-mixed .nq-frac-part .nq-denominator {
    padding: 0 1px;
    font-weight: 700;
}