:root {
    --night: #0a0a0c;
    --night-light: #121216;
    --ivory: #f5f1e8;
    --ivory-muted: rgba(245, 241, 232, 0.6);
    --gold: #c9a35f;
    --dune: #d97642;
    --border: rgba(255, 255, 255, 0.08);
    --card-bg: rgba(255, 255, 255, 0.03);
    
    --font-ui: 'Inter', sans-serif;
    --font-display: 'Cormorant Garamond', serif;
    --font-code: 'JetBrains Mono', monospace;

    --sidebar-width: 360px;
    --accent-gradient: linear-gradient(135deg, var(--dune), var(--gold));
}

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

body {
    background-color: var(--night);
    color: var(--ivory);
    font-family: var(--font-ui);
    -webkit-font-smoothing: antialiased;
    overflow: hidden;
    height: 100vh;
}

.app-shell {
    display: grid;
    grid-template-columns: 1fr var(--sidebar-width);
    height: 100vh;
}

/* Sidebar Styling */
.sidebar {
    background-color: var(--night-light);
    border-left: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    z-index: 100;
}

.sidebar-header {
    padding: 2.5rem 2rem;
    border-bottom: 1px solid var(--border);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    margin-bottom: 0.5rem;
}

.logo-mark {
    width: 32px;
    height: 32px;
    background: var(--accent-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    font-weight: 700;
    font-size: 0.8rem;
    color: white;
}

.logo h1 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    letter-spacing: 0.05em;
    font-weight: 600;
}

.sidebar-intro {
    font-size: 0.8rem;
    color: var(--ivory-muted);
    line-height: 1.4;
}

.sidebar-tabs {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    padding: 0.5rem;
    background-color: rgba(255, 255, 255, 0.02);
    border-bottom: 1px solid var(--border);
}

.tab-btn {
    padding: 0.8rem;
    background: none;
    border: none;
    color: var(--ivory-muted);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.2s ease;
}

.tab-btn.active {
    color: var(--ivory);
    background-color: rgba(255, 255, 255, 0.05);
}

.controls-container {
    flex: 1;
    overflow-y: auto;
    padding: 2rem;
}

.tab-panel {
    display: none;
    animation: fadeIn 0.4s ease forwards;
}

.tab-panel.active {
    display: block;
}

.control-group {
    margin-bottom: 1.8rem;
}

.control-group label {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-weight: 600;
    color: var(--gold);
    margin-bottom: 0.8rem;
}

.control-group label span {
    color: var(--ivory);
    font-family: var(--font-code);
}

input[type="range"] {
    width: 100%;
    appearance: none;
    background: rgba(255, 255, 255, 0.08);
    height: 4px;
    border-radius: 10px;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    width: 16px;
    height: 16px;
    background: var(--ivory);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
    transition: transform 0.2s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

input[type="color"] {
    width: 100%;
    height: 32px;
    background: none;
    border: 1px solid var(--border);
    border-radius: 6px;
    cursor: pointer;
}

/* Viewport & Stage */
.viewport {
    position: relative;
    display: flex;
    flex-direction: column;
}

.stage {
    flex: 1;
    position: relative;
    overflow: hidden;
    background-color: #050507;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: crosshair;
}

.pattern-layer {
    position: absolute;
    inset: 0;
    z-index: 1;
}

.noise-layer {
    position: absolute;
    inset: 0;
    z-index: 2;
    pointer-events: none;
    opacity: 0.15;
    filter: url(#grainy-noise);
}

/* Glass Card */
.glass-card {
    position: relative;
    z-index: 10;
    width: 400px;
    padding: 3.5rem;
    border-radius: 32px;
    background: rgba(255, 255, 255, 0.05); /* Default */
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    transition: all 0.1s ease;
}

.glass-card__content {
    animation: contentReveal 1s ease 0.4s forwards;
    opacity: 0;
}

.eyebrow {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--gold);
    margin-bottom: 0.8rem;
    font-weight: 500;
}

.glass-card h2 {
    font-family: var(--font-display);
    font-size: 2.8rem;
    margin-bottom: 1rem;
    line-height: 1.1;
}

.glass-card .description {
    font-size: 0.95rem;
    color: var(--ivory-muted);
    line-height: 1.6;
}

/* Draggable Points */
.mesh-point {
    position: absolute;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    border: 2px solid white;
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.5);
    cursor: grab;
    z-index: 50;
    transform: translate(-50%, -50%);
}

.mesh-point:active {
    cursor: grabbing;
}

/* Code Drawer */
.code-drawer {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: var(--night-light);
    border-top: 1px solid var(--border);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    transform: translateY(calc(100% - 48px));
    z-index: 200;
}

.code-drawer.open {
    transform: translateY(0);
}

.drawer-handle {
    width: 100%;
    height: 48px;
    background: none;
    border: none;
    padding: 0 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    color: var(--gold);
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    cursor: pointer;
}

.drawer-handle svg {
    transition: transform 0.3s ease;
}

.code-drawer.open .drawer-handle svg {
    transform: rotate(180deg);
}

.drawer-content {
    padding: 2rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    max-height: 40vh;
    overflow-y: auto;
}

.code-group {
    background-color: rgba(0, 0, 0, 0.3);
    border-radius: 12px;
    padding: 1.5rem;
    border: 1px solid var(--border);
}

.code-group header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.code-group h3 {
    font-size: 0.75rem;
    color: var(--ivory-muted);
    text-transform: uppercase;
}

.copy-btn {
    background: none;
    border: 1px solid var(--gold);
    color: var(--gold);
    padding: 0.3rem 0.8rem;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s ease;
}

.copy-btn:hover {
    background-color: var(--gold);
    color: var(--night);
}

.code-group pre {
    margin: 0;
    font-family: var(--font-code);
    font-size: 0.85rem;
    color: #a0a0a0;
    overflow-x: auto;
}

/* Presets */
.preset-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.preset-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: center;
}

.preset-card:hover {
    background-color: rgba(255, 255, 255, 0.08);
}

.swatch {
    height: 60px;
    border-radius: 8px;
    margin-bottom: 0.8rem;
}

.swatch.desert { background: linear-gradient(135deg, #FFB382, #FF7B54); }
.swatch.midnight { background: linear-gradient(135deg, #121216, #2E5090); }
.swatch.opal { background: linear-gradient(135deg, #E29587, #D4E2D4); }
.swatch.vanta { background: linear-gradient(135deg, #050507, #1A1A1E); }

.preset-card span {
    font-size: 0.75rem;
    font-weight: 600;
}

/* Helpers */
.btn-secondary {
    width: 100%;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px dashed var(--gold);
    color: var(--gold);
    border-radius: 12px;
    font-weight: 600;
    font-size: 0.8rem;
    cursor: pointer;
    margin-top: 1.5rem;
}

.btn-ghost {
    width: 100%;
    padding: 1rem;
    background: none;
    border: none;
    color: var(--ivory-muted);
    font-weight: 600;
    font-size: 0.8rem;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.sidebar-footer {
    padding: 1.5rem 2rem;
    border-top: 1px solid var(--border);
}

.toast {
    position: fixed;
    top: 2rem;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--gold);
    color: var(--night);
    padding: 0.8rem 1.5rem;
    border-radius: 8px;
    font-weight: 700;
    font-size: 0.85rem;
    z-index: 1000;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    animation: toastReveal 0.3s ease forwards;
}

@keyframes toastReveal {
    from { opacity: 0; transform: translate(-50%, -10px); }
    to { opacity: 1; transform: translate(-50%, 0); }
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

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