:root {
    /* Dark Theme Default */
    --bg-app: #030712;
    --bg-card: rgba(15, 23, 42, 0.7);
    --border: rgba(255, 255, 255, 0.1);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --primary: #6366f1;
    --primary-hover: #818cf8;

    --axis-x: #ef4444;
    /* Neon Red */
    --axis-y: #22c55e;
    /* Neon Green */
    --axis-z: #3b82f6;
    /* Neon Blue */

    --face-front: rgba(99, 102, 241, 0.7);
    --face-back: rgba(236, 72, 153, 0.7);
    --face-right: rgba(16, 185, 129, 0.7);
    --face-left: rgba(245, 158, 11, 0.7);
    --face-top: rgba(14, 165, 233, 0.7);
    --face-bottom: rgba(168, 85, 247, 0.7);

    --font-sans: 'Inter', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    --cube-size: 200px;
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-app);
    color: var(--text-main);
    height: 100vh;
    overflow: hidden;
    display: flex;
    background-image:
        radial-gradient(circle at 50% 50%, rgba(99, 102, 241, 0.1) 0%, transparent 60%);
}

.code-font {
    font-family: var(--font-mono);
}

/* Glassmorphism Cards */
.card {
    border: 1px solid var(--border);
    border-radius: 16px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
}

.glass {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

/* ===== Floating UI Dashboard ===== */
.controls-panel {
    position: absolute;
    top: 24px;
    left: 24px;
    bottom: 24px;
    width: 380px;
    display: flex;
    flex-direction: column;
    z-index: 100;
    overflow: hidden;
}

.panel-header {
    padding: 24px;
    border-bottom: 1px solid var(--border);
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
    color: var(--primary);
}

.logo h1 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-main);
    letter-spacing: -0.02em;
}

.subtitle {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.panel-scroll {
    flex: 1;
    overflow-y: auto;
    padding: 0;
}

.panel-scroll::-webkit-scrollbar {
    width: 6px;
}

.panel-scroll::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
}

.control-group {
    padding: 24px;
    border-bottom: 1px solid var(--border);
}

.control-group h3 {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--primary);
    margin-bottom: 16px;
    font-weight: 600;
}

.child-group h3 {
    color: #a855f7;
}

.slider-wrapper {
    margin-bottom: 16px;
}

.slider-wrapper:last-child {
    margin-bottom: 0;
}

.slider-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
    font-size: 0.85rem;
}

.prop-name {
    font-weight: 500;
    font-family: var(--font-mono);
    font-size: 0.8rem;
}

.prop-val {
    color: var(--text-muted);
    font-variant-numeric: tabular-nums;
}

input[type=range] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    outline: none;
    margin: 8px 0;
}

input[type=range]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--text-main);
    cursor: pointer;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
    transition: transform 0.1s;
}

input[type=range]:active::-webkit-slider-thumb {
    transform: scale(1.2);
    background: var(--primary);
}

input[type=range].child-slider:active::-webkit-slider-thumb {
    background: #a855f7;
}

/* Toggles */
.toggle-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.toggle-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.85rem;
    cursor: pointer;
    color: var(--text-muted);
    transition: color 0.1s;
}

.toggle-item:hover {
    color: var(--text-main);
}

.toggle-item input {
    display: none;
}

.custom-checkbox {
    width: 18px;
    height: 18px;
    border: 2px solid var(--border);
    border-radius: 4px;
    display: inline-block;
    position: relative;
    transition: all 0.2s;
}

.toggle-item input:checked+.custom-checkbox {
    background: var(--primary);
    border-color: var(--primary);
}

.toggle-item input:checked+.custom-checkbox::after {
    content: '';
    position: absolute;
    left: 5px;
    top: 1px;
    width: 4px;
    height: 9px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.btn {
    padding: 8px 16px;
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 500;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-main);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.05);
}

.btn-icon {
    padding: 6px;
    background: transparent;
    border: none;
    color: var(--text-muted);
}

.btn-icon:hover {
    color: var(--text-main);
    background: rgba(255, 255, 255, 0.1);
}

.mt-3 {
    margin-top: 16px;
    width: 100%;
}

/* ===== Code Output Footer ===== */
.css-output {
    position: absolute;
    right: 24px;
    bottom: 24px;
    width: 420px;
    z-index: 100;
    display: flex;
    flex-direction: column;
}

.code-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
}

pre {
    margin: 0;
    padding: 16px;
    overflow-x: auto;
    font-size: 0.85rem;
    line-height: 1.6;
    color: #a5b4fc;
}


/* ===== Viewport & 3D Stage ===== */
.viewport {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    perspective-origin: center center;
    background: repeating-linear-gradient(rgba(255, 255, 255, 0.02) 0 1px, transparent 1px 100px),
        repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.02) 0 1px, transparent 1px 100px);
    z-index: 1;
}

/* The Container doing the perspective */
.stage {
    position: relative;
    width: var(--cube-size);
    height: var(--cube-size);
    perspective: 800px;
    perspective-origin: 50% 50%;
    transform-style: preserve-3d;
}

/* Axis Helpers */
.world-axis {
    position: absolute;
    inset: 0;
    transform-style: preserve-3d;
    pointer-events: none;
    opacity: 1;
    /* toggled via JS class */
    transition: opacity 0.3s;
}

.world-axis.hidden {
    opacity: 0;
}

.axis {
    position: absolute;
    top: 50%;
    left: 50%;
    transform-origin: 0 0;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: bold;
}

.axis span {
    padding: 4px;
    background: rgba(0, 0, 0, 0.5);
    border-radius: 4px;
}

.x-axis {
    width: 300px;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--axis-x));
    transform: translateY(-1px);
    color: var(--axis-x);
}

.y-axis {
    height: 300px;
    width: 2px;
    align-items: flex-start;
    justify-content: center;
    background: linear-gradient(180deg, transparent, var(--axis-y));
    transform: translateX(-1px) rotateX(180deg);
    color: var(--axis-y);
}

.y-axis span {
    margin-top: 280px;
}

.z-axis {
    width: 300px;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--axis-z));
    transform: translateY(-1px) rotateY(-90deg);
    color: var(--axis-z);
}

/* The Cube */
.cube {
    position: relative;
    width: 100%;
    height: 100%;
    transform-style: preserve-3d;
    /* Default Transform */
    transform: rotateX(-20deg) rotateY(45deg) rotateZ(0deg) translate3d(0, 0, 0);
}

.cube.is-animated {
    transition: transform 1s cubic-bezier(0.4, 0, 0.2, 1);
}

.face {
    position: absolute;
    width: var(--cube-size);
    height: var(--cube-size);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.2);
    backface-visibility: visible;
    /* Make face glow slightly */
    box-shadow: inset 0 0 40px rgba(0, 0, 0, 0.2);
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    /* for explode */
}

/* Face positioning */
/* Note: Z transform pushes the face out to form the cube */
.face.front {
    transform: rotateY(0deg) translateZ(calc(var(--cube-size)/2));
    background: var(--face-front);
}

.face.back {
    transform: rotateY(180deg) translateZ(calc(var(--cube-size)/2));
    background: var(--face-back);
}

.face.right {
    transform: rotateY(90deg) translateZ(calc(var(--cube-size)/2));
    background: var(--face-right);
}

.face.left {
    transform: rotateY(-90deg) translateZ(calc(var(--cube-size)/2));
    background: var(--face-left);
}

.face.top {
    transform: rotateX(90deg) translateZ(calc(var(--cube-size)/2));
    background: var(--face-top);
}

.face.bottom {
    transform: rotateX(-90deg) translateZ(calc(var(--cube-size)/2));
    background: var(--face-bottom);
}

/* Exploded state */
.cube.exploded .face.front {
    transform: rotateY(0deg) translateZ(calc(var(--cube-size)));
}

.cube.exploded .face.back {
    transform: rotateY(180deg) translateZ(calc(var(--cube-size)));
}

.cube.exploded .face.right {
    transform: rotateY(90deg) translateZ(calc(var(--cube-size)));
}

.cube.exploded .face.left {
    transform: rotateY(-90deg) translateZ(calc(var(--cube-size)));
}

.cube.exploded .face.top {
    transform: rotateX(90deg) translateZ(calc(var(--cube-size)));
}

.cube.exploded .face.bottom {
    transform: rotateX(-90deg) translateZ(calc(var(--cube-size)));
}

/* Toast */
.toast {
    position: fixed;
    top: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(-20px);
    background: var(--primary);
    color: white;
    padding: 8px 16px;
    border-radius: 8px;
    font-weight: 500;
    font-size: 0.85rem;
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s;
    z-index: 1000;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}