:root {
    --led-on-color: #ffcc00;
    --led-off-color: #1a1a1a;
    --led-glow: #ffaa00;
    --bg-dark: #f5f5f0;
    --bg-medium: #1a1a1a;
    --die-bg: #3a3a3a;
    --text-color: #333;

    /* Scale: pixels per millimeter (10px = 1mm) */
    --scale: 10px;

    /* Physical dimensions in mm, converted to px via scale */
    --led-size: calc(2 * var(--scale));      /* 2mm */
    --led-gap: calc(2 * var(--scale));       /* 2mm */
    --die-size: calc(14 * var(--scale));     /* 14mm */
    --lock-width: calc(6 * var(--scale));    /* 6mm */
    --lock-height: calc(6 * var(--scale));   /* 6mm */
    --rolls-height: calc(6 * var(--scale));  /* 6mm */
    --rolls-width: calc(14 * var(--scale));  /* 14mm */
    --spacing: calc(2 * var(--scale));       /* 2mm between elements */
    --corner-radius: calc(2 * var(--scale)); /* 2mm rounded corners */
    --device-padding: calc(4 * var(--scale)); /* 4mm padding */
    --button-width: calc(8 * var(--scale));   /* 8mm total button width */
    --button-height: calc(4 * var(--scale));  /* 4mm button height */
    --button-protrusion: calc(1.6 * var(--scale)); /* 1.6mm sticking out */
}

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

body {
    font-family: 'Courier New', monospace;
    background: var(--bg-dark);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: calc(4 * var(--scale));
}

.container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: calc(6 * var(--scale));
}

/* Device wrapper (contains buttons and device) */
.device-wrapper {
    position: relative;
    overflow: visible;
}

/* Device (mimics physical layout) */
.device {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing);
    padding: var(--device-padding);
    background: var(--bg-medium);
    border-radius: calc(2 * var(--scale));
    position: relative;
    z-index: 1; /* Place above buttons */
}

/* Physical buttons (left edge) */
.button {
    width: var(--button-width);
    height: var(--button-height);
    background: linear-gradient(to right, #444, #555);
    border: 1px solid #222;
    border-right: none; /* No border on the hidden side */
    border-radius: calc(0.8 * var(--scale)) 0 0 calc(0.8 * var(--scale)); /* 0.8mm rounded corners */
    cursor: pointer;
    transition: transform 0.1s ease, box-shadow 0.1s ease;
    box-shadow:
        inset calc(0.4 * var(--scale)) 0 calc(0.4 * var(--scale)) rgba(255, 255, 255, 0.2);
    position: absolute;
    left: calc(-1 * var(--button-protrusion));
    z-index: 0; /* Place under device */
}

/* Position buttons for each row (vertically centered) */
.button[data-row="0"] {
    top: calc(var(--device-padding) + (var(--rolls-height) - var(--button-height)) / 2);
} /* Rolls row - centered */
.button[data-row="1"] {
    top: calc(var(--device-padding) + var(--rolls-height) + var(--spacing) + (var(--die-size) - var(--button-height)) / 2);
} /* Die 5 - centered */
.button[data-row="2"] {
    top: calc(var(--device-padding) + var(--rolls-height) + var(--spacing) + var(--die-size) + var(--spacing) + (var(--die-size) - var(--button-height)) / 2);
} /* Die 4 */
.button[data-row="3"] {
    top: calc(var(--device-padding) + var(--rolls-height) + var(--spacing) + var(--die-size) + var(--spacing) + var(--die-size) + var(--spacing) + (var(--die-size) - var(--button-height)) / 2);
} /* Die 3 */
.button[data-row="4"] {
    top: calc(var(--device-padding) + var(--rolls-height) + var(--spacing) + var(--die-size) + var(--spacing) + var(--die-size) + var(--spacing) + var(--die-size) + var(--spacing) + (var(--die-size) - var(--button-height)) / 2);
} /* Die 2 */
.button[data-row="5"] {
    top: calc(var(--device-padding) + var(--rolls-height) + var(--spacing) + var(--die-size) + var(--spacing) + var(--die-size) + var(--spacing) + var(--die-size) + var(--spacing) + var(--die-size) + var(--spacing) + (var(--die-size) - var(--button-height)) / 2);
} /* Die 1 */

.button:hover {
    background: linear-gradient(to right, #555, #777);
}

.button:active,
.button.pressed {
    transform: translateX(calc(1.0 * var(--scale))); /* Slide INTO the device (1.0mm, leaving 0.6mm visible) */
    box-shadow:
        inset calc(0.2 * var(--scale)) 0 calc(0.2 * var(--scale)) rgba(0, 0, 0, 0.2);
}

/* Rolls remaining row (mimics die-row structure) */
.rolls-row {
    display: flex;
    align-items: center;
    gap: var(--spacing);
}

/* Spacer to align rolls with dice (same width as lock container) */
.rolls-spacer {
    width: var(--lock-width);
}

/* Rolls remaining container (top) */
.rolls-container {
    width: var(--rolls-width);
    height: var(--rolls-height);
    background: var(--die-bg);
    border-radius: var(--corner-radius);
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--led-gap);
}

/* Die row (lock + die) */
.die-row {
    display: flex;
    align-items: center;
    gap: var(--spacing);
}

/* Lock container */
.lock-container {
    width: var(--lock-width);
    height: var(--lock-height);
    background: var(--die-bg);
    border-radius: var(--corner-radius);
    display: flex;
    justify-content: center;
    align-items: center;
}

/* Die container */
.die-container {
    width: var(--die-size);
    height: var(--die-size);
    background: var(--die-bg);
    border-radius: var(--corner-radius);
    display: flex;
    justify-content: center;
    align-items: center;
}

/* Die 3x3 grid */
.die-grid {
    display: grid;
    grid-template-columns: repeat(3, var(--led-size));
    grid-template-rows: repeat(3, var(--led-size));
    gap: var(--led-gap);
}

/* LED styling (both pips and indicators) */
.led, .pip {
    width: var(--led-size);
    height: var(--led-size);
    border-radius: 50%;
    background: var(--led-off-color);
    transition: all 0.15s ease;
}

.led.on, .pip.on {
    background: var(--led-on-color);
    box-shadow:
        0 0 10px var(--led-glow),
        0 0 20px var(--led-glow),
        0 0 30px rgba(255, 170, 0, 0.5);
}

.led.off, .pip.off {
    background: var(--led-off-color);
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.5);
}

/* Controls help */
.controls-help {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem;
    background: var(--bg-medium);
    border-radius: 8px;
}

.control-item {
    font-size: 0.9rem;
}

kbd {
    display: inline-block;
    padding: 0.3rem 0.6rem;
    background: #444;
    border: 2px solid #555;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-weight: bold;
    box-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

/* Responsive design */
@media (max-width: 768px) {
    :root {
        --scale: 5px;
    }
}

/* Loading indicator (optional) */
.loading {
    text-align: center;
    padding: 2rem;
    font-size: 1.2rem;
}

/* Debug panel */
.debug-toggle {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 48px;
    height: 48px;
    border: none;
    border-radius: 50%;
    background: var(--bg-medium);
    color: var(--led-on-color);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    transition: all 0.3s ease;
    z-index: 1000;
    opacity: 1;
    pointer-events: auto;
}

.debug-toggle.hidden {
    opacity: 0;
    pointer-events: none;
}

.debug-toggle:hover {
    background: #2a2a2a;
    transform: scale(1.1);
}

.debug-toggle svg {
    width: 24px;
    height: 24px;
}

.debug-panel {
    position: fixed;
    top: 0;
    right: -450px;
    width: 450px;
    height: 100vh;
    background: var(--bg-medium);
    color: #fff;
    box-shadow: -4px 0 12px rgba(0, 0, 0, 0.5);
    transition: right 0.3s ease;
    z-index: 999;
    display: flex;
    flex-direction: column;
}

.debug-panel.open {
    right: 0;
}

.debug-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: .5rem .5rem .5rem 1.5rem;
}

.debug-header h2 {
    font-size: 1.1rem;
    margin: 0;
    color: var(--led-on-color);
    font-weight: bold;
}

.debug-close {
    background: none;
    border: none;
    color: var(--led-on-color);
    font-size: 2rem;
    cursor: pointer;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.2s ease;
}

.debug-close:hover {
    color: var(--led-on-color);
}

.debug-controls {
    padding: 1.5rem;
}

.debug-control-group {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.5rem 0;
}

.debug-control-group label {
    font-size: 0.9rem;
    font-weight: bold;
    color: var(--led-on-color);
    white-space: nowrap;
}

.debug-control-group .control-right {
    flex: 1;
    max-width: 200px;
    display: flex;
    justify-content: flex-end;
}

.battery-slider {
    width: 100%;
    height: 8px;
    border-radius: 4px;
    background: #444;
    outline: none;
    -webkit-appearance: none;
}

/* Custom LED-style checkbox */
.debug-checkbox {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--die-bg);
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.5);
    cursor: pointer;
    transition: all 0.15s ease;
}

.debug-checkbox:checked {
    background: var(--led-on-color);
    box-shadow:
        0 0 10px var(--led-glow),
        0 0 20px var(--led-glow),
        0 0 30px rgba(255, 170, 0, 0.5);
}

.battery-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--led-on-color);
    cursor: pointer;
    box-shadow: 0 0 10px var(--led-glow);
}

.battery-slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--led-on-color);
    cursor: pointer;
    border: none;
    box-shadow: 0 0 10px var(--led-glow);
}

.battery-presets {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.battery-preset {
    padding: 0.4rem 0.8rem;
    background: #444;
    border: 1px solid #555;
    color: #fff;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: all 0.2s ease;
}

.battery-preset:hover {
    background: #555;
    border-color: var(--led-on-color);
}

.battery-preset:active {
    background: var(--led-on-color);
    color: #000;
}

.debug-logs {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.debug-logs-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem 0;
}

.debug-logs-header h3 {
    font-size: 0.95rem;
    margin: 0;
    color: var(--led-on-color);
}

.log-output {
    flex: 1;
    overflow-y: auto;
    padding: 0.5rem 1.5rem 1rem ;
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
    line-height: 1.5;
}

.log-entry {
    word-wrap: break-word;
}

.log-entry::before {
    color: var(--led-on-color);
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .debug-panel {
        width: 100%;
        right: -100%;
    }

    .debug-toggle {
        bottom: 10px;
        right: 10px;
    }
}