/* Drawing Board Styles */
.root, html, body {
    box-sizing: border-box;
}
html, body {
    overflow-x: hidden; /* prevent unwanted horizontal scrolling */
}
.drawing-board-section {
    background: #ffffff;
    padding: 2rem;
    border-radius: 15px;
    margin: 3rem auto;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    max-width: 820px; /* keep board fixed and centered */
}

.drawing-board-section h3 {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--color-blue);
}

.drawing-board-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    max-width: 100%;
    margin: 0 auto;
    padding: 0 12px;
}

.drawing-board-wrapper {
    position: relative;
    background: #f8f9fa;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

#drawing-canvas {
    width: 100%;
    height: 520px;
    background: #fff;
    cursor: crosshair;
}

.drawing-controls {
    display: grid;
    gap: 0.75rem;
    padding: 1rem;
    background: #f8f9fa;
    border-radius: 8px;
    align-items: center;
    grid-template-columns: 1fr; /* default single column for narrow viewports */
    overflow: visible; /* ensure children scrollbars are not clipped */
}

.control-group {
    display: flex;
    gap: 0.5rem;
    align-items: center;
        flex-wrap: wrap;
        min-width: 0; /* allow children to shrink within grid */
}

.tool-btn {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 6px;
    background: #fff;
    color: #333;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 500;
    transition: all 0.2s ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.tool-btn:hover {
    background: var(--color-blue);
    color: #fff;
    transform: translateY(-2px);
}

.tool-btn.active {
    background: var(--color-blue);
    color: #fff;
}

.tool-btn i {
    font-size: 1.1rem;
}

#color-picker {
    width: 40px;
    height: 40px;
    padding: 0;
    border: none;
    border-radius: 6px;
    cursor: pointer;
}

#line-width {
    width: 100px;
    margin: 0 0.5rem;
}

.drawing-board-btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.drawing-board-btn.clear {
    background: #dc3545;
    color: #fff;
}

.drawing-board-btn.clear:hover {
    background: #c82333;
    transform: translateY(-2px);
}

@media (max-width: 768px) {
    /* Use single-column stacked controls on tablets and phones to avoid crowding */
    .drawing-controls {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }

    .control-group {
        justify-content: flex-start;
    }

    #drawing-canvas {
        height: 420px;
    }

    /* Make the first control-group (tools) a horizontal scrollable toolbar on tablets/phones */
    .drawing-controls .control-group:first-child {
        display: flex;
        flex-wrap: nowrap;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        gap: 0.5rem;
        padding-bottom: 4px;
        width: 100%;
    }

    .drawing-controls .control-group:first-child .tool-btn {
        flex: 0 0 auto;
        width: auto;
        white-space: nowrap;
    }
}

/* Mobile-friendly larger touch targets */
@media (max-width: 480px) {
    .tool-btn {
        padding: 0.75rem 0.6rem;
        font-size: 0.95rem;
        min-width: 56px;
        min-height: 48px;
        width: auto;
        justify-content: center;
    }

    .tool-btn i {
        font-size: 1.35rem;
    }

    .drawing-board-btn {
        padding: 0.75rem 1rem;
        min-height: 48px;
        width: auto;
    }

    .control-group {
        flex-wrap: wrap;
        gap: 0.75rem;
    }
}

/* Mobile polish: keep tool buttons in a horizontal row (scrollable) so they don't wrap and overlap */
@media (max-width: 420px) {
    /* First control-group contains the main tool buttons (Lápiz, Rectángulo, Círculo, Línea) */
    .drawing-controls .control-group:nth-child(1) {
        display: flex;
        flex-wrap: nowrap;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        gap: 0.5rem;
        padding-bottom: 4px;
    }

    .drawing-controls .control-group:nth-child(1) .tool-btn {
        width: auto; /* let buttons size to content */
        min-width: 56px;
        flex: 0 0 auto;
    }

    /* Make other control groups stack vertically and full width for clarity */
    .drawing-controls .control-group:not(:nth-child(1)) {
        display: flex;
        flex-direction: column;
        align-items: stretch;
        gap: 0.5rem;
    }

    .drawing-controls label {
        display: block;
        margin-bottom: 4px;
        font-size: 0.95rem;
    }

    .drawing-controls input[type="color"],
    .drawing-controls input[type="range"],
    .drawing-controls input[type="number"] {
        max-width: 100%;
        width: 100%;
    }

    .drawing-board-btn {
        width: 100%;
        justify-content: center;
    }

    /* Reduce forced-angle inline spacing */
    #angle-input { width: 100%; box-sizing: border-box; }
    #forced-angle-display { margin-left: 0; }
}

/* Ensure wrapper itself prevents touch-based scrolling while interacting */
.drawing-board-wrapper {
    touch-action: none;
    -ms-touch-action: none;
}

/* Indicador de ángulo para la regla */
.angle-indicator {
    position: absolute;
    background: rgba(0,0,0,0.75);
    color: #fff;
    padding: 6px 8px;
    border-radius: 6px;
    font-size: 0.9rem;
    pointer-events: none;
    z-index: 40;
    transform: translate(-50%, -50%);
    display: none;
}

.tool-btn[data-tool="ruler"] {
    display: inline-flex;
}

.tool-btn[data-tool="ruler"].active {
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    color: white;
}

/* Imagen de regla (overlay) */
#ruler-image {
    position: absolute;
    left: 0;
    top: 0;
    width: 360px; /* tamaño por defecto, ajustable */
    opacity: 0.85;
    transform-origin: 10% 50%; /* origen cerca del borde izquierdo para girar tipo regla */
    pointer-events: none; /* no bloquear eventos del canvas; arrastre detectado por JS global */
    z-index: 30;
    display: none;
}

.ruler-controls {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

#ruler-rotation {
    width: 160px;
}

/* Prevent default touch gestures on the canvas so drawing doesn't scroll the page */
#drawing-canvas, .drawing-board-wrapper canvas {
    touch-action: none;
    -ms-touch-action: none;
}

@media (min-width: 769px) and (max-width: 991px) {
    .drawing-controls {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 992px) {
    .drawing-controls {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Very narrow screens (phones like 292px width) */
@media (max-width: 320px) {
    .drawing-board-section {
        padding: 0.8rem;
        margin: 1rem auto;
        max-width: 292px; /* target the size you reported */
    }

    #drawing-canvas {
        height: 320px;
    }

    .drawing-controls {
        grid-template-columns: 1fr;
        padding: 0.6rem;
        gap: 0.5rem;
    }

    /* First group (tools) becomes a horizontal scrollable toolbar */
    .drawing-controls .control-group:nth-child(1) {
        display: flex;
        gap: 0.45rem;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        padding-bottom: 4px;
        width: 100%;
    }

    .drawing-controls .control-group:nth-child(1) .tool-btn {
        flex: 0 0 auto;
        width: auto !important; /* override earlier full-width rule */
        white-space: nowrap;
        padding: 0.5rem 0.6rem;
        font-size: 0.95rem;
    }

    /* Stack remaining control groups vertically, full width */
    .drawing-controls .control-group:not(:nth-child(1)) {
        display: flex;
        flex-direction: column;
        gap: 0.35rem;
        align-items: stretch;
        width: 100%;
    }

    .drawing-controls label {
        font-size: 0.9rem;
        margin-bottom: 4px;
    }

    .drawing-controls input[type="color"],
    .drawing-controls input[type="range"],
    .drawing-controls input[type="number"] {
        width: 100%;
        box-sizing: border-box;
    }

    .drawing-board-btn {
        width: 100%;
    }

}