/* ═══════════════════════════════════════════════════════════════════════
   Forma — Abstract Geometric UI
   ═══════════════════════════════════════════════════════════════════════ */

:root {
    /* Core color tokens */
    --color-bg-0: #07070f;
    --color-surface-0: rgba(7, 7, 15, 0.82);
    --color-border-0: rgba(0, 229, 204, 0.25);
    --color-border-strong: rgba(0, 229, 204, 0.55);
    --color-accent-0: #00e5cc;
    --color-accent-soft: rgba(0, 229, 204, 0.15);
    --color-text-0: #e0e0e8;
    --color-text-1: rgba(224, 224, 232, 0.5);
    --color-danger-0: #ff4466;
    --color-shadow-accent: rgba(0, 229, 204, 0.22);

    /* Typography tokens */
    --font-ui: 'JetBrains Mono', monospace;
    --font-display: 'Space Grotesk', 'JetBrains Mono', sans-serif;
    --type-xs: 11px;
    --type-sm: 12px;
    --type-md: 14px;
    --type-lg: 15px;
    --type-xl: 30px;
    --type-hero: 72px;

    /* Sizing and spacing tokens */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-pill: 999px;
    --space-1: 6px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 14px;
    --space-5: 18px;
    --space-6: 24px;
    --control-h-md: 40px;
    --control-h-mobile: 46px;
    --panel-w-left: 248px;
    --panel-w-right: 318px;
    --panel-blur: 22px;
    --layout-edge: 18px;
    --layout-top: 18px;
    --layout-bottom: 18px;
    --topbar-stack-h: 128px;
    --workspace-bottom-reserve: 170px;
    --zoom-bottom-clearance: 96px;
    --workspace-top: calc(var(--layout-top) + var(--topbar-stack-h) + var(--workspace-gap));
    --workspace-gap: 14px;
    --theme-btn-radius: var(--radius-sm);
    --theme-mode-radius: var(--radius-sm);
    --theme-slider-thumb-radius: var(--radius-sm);
    --theme-panel-border-style: solid;
    --theme-panel-shadow: 0 12px 42px rgba(0, 0, 0, 0.32), 0 0 0 1px rgba(255, 255, 255, 0.02), 0 0 32px var(--shadow-accent);
    --theme-panel-hover-shadow: 0 18px 56px rgba(0, 0, 0, 0.4), 0 0 42px var(--shadow-accent);
    --theme-control-surface: color-mix(in srgb, var(--accent) 7%, transparent);
    --theme-btn-bg: transparent;
    --theme-btn-hover-bg: var(--theme-control-surface);
    --theme-btn-accent-hover-bg: var(--accent);
    --theme-btn-accent-hover-text: var(--bg);
    --theme-heading-track: 4px;
    --theme-button-track: 0.9px;
    --theme-fx-overlay: radial-gradient(circle at 15% 15%, color-mix(in srgb, var(--accent) 10%, transparent), transparent 45%);
    --theme-fx-overlay-opacity: 0.55;
    --theme-fx-noise-opacity: 0.08;
    --motion-fast: 120ms;
    --motion-base: 180ms;
    --motion-slow: 260ms;
    --motion-ease: cubic-bezier(0.2, 0.7, 0.2, 1);
    --theme-fx-noise: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 2px,
        rgba(255, 255, 255, 0.06) 2px,
        rgba(255, 255, 255, 0.06) 3px
    );

    /* Backward-compatible aliases (temporary bridge during token migration) */
    --bg: var(--color-bg-0);
    --bg-panel: var(--color-surface-0);
    --border: var(--color-border-0);
    --border-hover: var(--color-border-strong);
    --accent: var(--color-accent-0);
    --accent-dim: var(--color-accent-soft);
    --text: var(--color-text-0);
    --text-dim: var(--color-text-1);
    --danger: var(--color-danger-0);
    --font: var(--font-ui);
    --shadow-accent: var(--color-shadow-accent);
    --panel-radius: var(--radius-md);
    --panel-padding: var(--space-5);
    --panel-gap: var(--space-5);
    --panel-width-left: var(--panel-w-left);
    --panel-width-right: var(--panel-w-right);
    --control-height: var(--control-h-md);
    --panel-grid: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 19px,
        rgba(0, 229, 204, 0.04) 19px,
        rgba(0, 229, 204, 0.04) 20px
    ),
    repeating-linear-gradient(
        90deg,
        transparent,
        transparent 19px,
        rgba(0, 229, 204, 0.04) 19px,
        rgba(0, 229, 204, 0.04) 20px
    );
}

body[data-theme="lab"] {
    --color-bg-0: #071118;
    --color-surface-0: rgba(7, 17, 24, 0.86);
    --color-border-0: rgba(78, 232, 255, 0.24);
    --color-border-strong: rgba(78, 232, 255, 0.65);
    --color-accent-0: #4ee8ff;
    --color-accent-soft: rgba(78, 232, 255, 0.14);
    --color-text-0: #eef7ff;
    --color-text-1: rgba(214, 232, 248, 0.6);
    --color-shadow-accent: rgba(78, 232, 255, 0.28);
    --theme-btn-radius: 7px;
    --theme-mode-radius: 4px;
    --theme-slider-thumb-radius: 4px;
    --theme-panel-border-style: solid;
    --theme-control-surface: color-mix(in srgb, var(--accent) 8%, transparent);
    --theme-heading-track: 5px;
    --theme-button-track: 1.1px;
    --theme-fx-overlay: radial-gradient(circle at 20% 20%, rgba(78, 232, 255, 0.25), transparent 42%),
        radial-gradient(circle at 85% 18%, rgba(56, 154, 255, 0.2), transparent 36%);
    --theme-fx-overlay-opacity: 0.48;
    --theme-fx-noise-opacity: 0.05;
}

body[data-theme="ember"] {
    --color-bg-0: #140805;
    --color-surface-0: rgba(24, 10, 5, 0.86);
    --color-border-0: rgba(255, 118, 44, 0.28);
    --color-border-strong: rgba(255, 190, 89, 0.72);
    --color-accent-0: #ff9f43;
    --color-accent-soft: rgba(255, 144, 61, 0.16);
    --color-text-0: #fff1e5;
    --color-text-1: rgba(255, 224, 204, 0.62);
    --color-shadow-accent: rgba(255, 122, 47, 0.3);
    --panel-grid: repeating-linear-gradient(
        135deg,
        transparent,
        transparent 14px,
        rgba(255, 164, 77, 0.06) 14px,
        rgba(255, 164, 77, 0.06) 16px
    );
    --theme-btn-radius: 12px;
    --theme-mode-radius: 10px;
    --theme-slider-thumb-radius: 999px;
    --theme-panel-border-style: solid;
    --theme-panel-shadow: 0 18px 52px rgba(10, 4, 2, 0.5), 0 0 0 1px rgba(255, 187, 130, 0.06), 0 0 30px var(--shadow-accent);
    --theme-panel-hover-shadow: 0 24px 64px rgba(10, 4, 2, 0.6), 0 0 40px var(--shadow-accent);
    --theme-control-surface: color-mix(in srgb, var(--accent) 12%, transparent);
    --theme-heading-track: 2.8px;
    --theme-button-track: 0.7px;
    --theme-btn-bg: linear-gradient(180deg, rgba(255, 174, 93, 0.08), rgba(255, 120, 40, 0.03));
    --theme-btn-hover-bg: linear-gradient(180deg, rgba(255, 169, 88, 0.22), rgba(255, 122, 44, 0.14));
    --theme-fx-overlay: radial-gradient(circle at 14% 84%, rgba(255, 153, 71, 0.28), transparent 45%),
        radial-gradient(circle at 86% 12%, rgba(255, 111, 45, 0.2), transparent 38%);
    --theme-fx-overlay-opacity: 0.62;
    --theme-fx-noise-opacity: 0.03;
}

body[data-theme="bio"] {
    --color-bg-0: #07140f;
    --color-surface-0: rgba(6, 20, 14, 0.86);
    --color-border-0: rgba(97, 255, 161, 0.26);
    --color-border-strong: rgba(150, 255, 95, 0.68);
    --color-accent-0: #66ffb3;
    --color-accent-soft: rgba(92, 255, 159, 0.16);
    --color-text-0: #ecfff5;
    --color-text-1: rgba(197, 242, 213, 0.62);
    --color-shadow-accent: rgba(88, 255, 162, 0.3);
    --panel-grid:
        radial-gradient(circle at 12px 12px, rgba(104, 255, 171, 0.09) 1.1px, transparent 1.2px),
        radial-gradient(circle at 0 0, rgba(104, 255, 171, 0.04) 0.8px, transparent 0.9px);
    --theme-btn-radius: 14px;
    --theme-mode-radius: 12px;
    --theme-slider-thumb-radius: 999px;
    --theme-panel-border-style: solid;
    --theme-panel-shadow: 0 14px 46px rgba(2, 12, 8, 0.45), 0 0 0 1px rgba(186, 255, 219, 0.05), 0 0 32px var(--shadow-accent);
    --theme-panel-hover-shadow: 0 20px 58px rgba(2, 12, 8, 0.55), 0 0 42px var(--shadow-accent);
    --theme-control-surface: color-mix(in srgb, var(--accent) 11%, transparent);
    --theme-heading-track: 3px;
    --theme-button-track: 0.8px;
    --theme-btn-bg: linear-gradient(180deg, rgba(113, 255, 183, 0.08), rgba(75, 255, 149, 0.04));
    --theme-btn-hover-bg: linear-gradient(180deg, rgba(113, 255, 183, 0.2), rgba(76, 255, 148, 0.14));
    --theme-fx-overlay: radial-gradient(circle at 12% 20%, rgba(88, 255, 162, 0.24), transparent 43%),
        radial-gradient(circle at 86% 78%, rgba(158, 255, 102, 0.2), transparent 38%);
    --theme-fx-overlay-opacity: 0.56;
    --theme-fx-noise-opacity: 0.04;
}

body[data-theme="mono"] {
    --color-bg-0: #0d0d0d;
    --color-surface-0: rgba(16, 16, 16, 0.9);
    --color-border-0: rgba(224, 224, 224, 0.22);
    --color-border-strong: rgba(255, 255, 255, 0.78);
    --color-accent-0: #f3f3f3;
    --color-accent-soft: rgba(255, 255, 255, 0.12);
    --color-text-0: #f5f5f5;
    --color-text-1: rgba(215, 215, 215, 0.56);
    --color-shadow-accent: rgba(255, 255, 255, 0.18);
    --panel-grid: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 15px,
        rgba(255, 255, 255, 0.035) 15px,
        rgba(255, 255, 255, 0.035) 16px
    );
    --theme-btn-radius: 0px;
    --theme-mode-radius: 0px;
    --theme-slider-thumb-radius: 0px;
    --theme-panel-border-style: dashed;
    --theme-panel-shadow: 0 10px 30px rgba(0, 0, 0, 0.45), 0 0 0 1px rgba(255, 255, 255, 0.03), 0 0 24px var(--shadow-accent);
    --theme-panel-hover-shadow: 0 16px 42px rgba(0, 0, 0, 0.55), 0 0 32px var(--shadow-accent);
    --theme-control-surface: color-mix(in srgb, var(--accent) 9%, transparent);
    --theme-heading-track: 2.2px;
    --theme-button-track: 0.5px;
    --theme-btn-bg: linear-gradient(180deg, rgba(255, 255, 255, 0.015), rgba(255, 255, 255, 0.005));
    --theme-btn-hover-bg: rgba(255, 255, 255, 0.14);
    --theme-fx-overlay: linear-gradient(125deg, rgba(255, 255, 255, 0.07), transparent 42%),
        radial-gradient(circle at 84% 14%, rgba(255, 255, 255, 0.11), transparent 34%);
    --theme-fx-overlay-opacity: 0.52;
    --theme-fx-noise-opacity: 0.06;
}

/* ── Reset ──────────────────────────────────────────────────────────── */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: var(--bg);
    font-family: var(--font-ui);
    color: var(--text);
    font-size: var(--type-md);
    line-height: 1.5;
    cursor: crosshair;
    user-select: none;
    -webkit-user-select: none;
    transition: background var(--motion-slow) var(--motion-ease), color var(--motion-slow) var(--motion-ease);
}

body::before,
body::after {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
}

body::before {
    z-index: 2;
    background: var(--theme-fx-overlay);
    opacity: var(--theme-fx-overlay-opacity);
}

body::after {
    z-index: 3;
    background: var(--theme-fx-noise);
    opacity: var(--theme-fx-noise-opacity);
    mix-blend-mode: soft-light;
}

/* ── Canvas ─────────────────────────────────────────────────────────── */
#canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: block;
    background:
        radial-gradient(circle at 20% 20%, color-mix(in srgb, var(--accent) 12%, transparent), transparent 30%),
        radial-gradient(circle at 80% 18%, color-mix(in srgb, var(--accent) 8%, transparent), transparent 28%),
        linear-gradient(180deg, color-mix(in srgb, var(--bg) 92%, #000 8%), var(--bg));
    z-index: 1;
}

body.mobile-ui #canvas {
    touch-action: none;
}

body.presentation .panel {
    display: none !important;
}

body.presentation #theme-badge,
body.presentation #about-modal {
    display: none !important;
}

body.presentation:not(.wallpaper-session) {
    cursor: none;
}

/* Wallpaper mode: hard-hide all interactive chrome. */
body.wallpaper-session #top-bar,
body.wallpaper-session #left-panel,
body.wallpaper-session #right-panel,
body.wallpaper-session #bottom-bar,
body.wallpaper-session #zoom-panel,
body.wallpaper-session #mobile-bar,
body.wallpaper-session #mobile-sheet-backdrop,
body.wallpaper-session #theme-badge,
body.wallpaper-session #about-modal {
    opacity: 0 !important;
    visibility: hidden !important;
    pointer-events: none !important;
}

/* Returning from wallpaper mode: brief, restrained reveal. */
body.controls-reveal #top-bar,
body.controls-reveal #left-panel,
body.controls-reveal #right-panel,
body.controls-reveal #bottom-bar,
body.controls-reveal #zoom-panel,
body.controls-reveal #mobile-bar {
    animation: controlsReveal 240ms ease-out;
}

@keyframes controlsReveal {
    from {
        opacity: 0;
        filter: blur(4px);
    }
    to {
        opacity: 1;
        filter: blur(0);
    }
}

#btn-exit-view {
    position: fixed;
    top: 14px;
    right: 14px;
    z-index: 260;
    display: none;
    border-radius: 999px;
    background: color-mix(in srgb, var(--bg-panel) 88%, black 12%);
}

body.presentation #btn-exit-view {
    display: inline-flex;
}

body.wallpaper-session #btn-exit-view {
    display: none !important;
}

#mobile-sheet-backdrop {
    display: none;
}

#mobile-bar {
    display: none;
}

.mobile-only {
    display: none;
}

/* ── Overlay ────────────────────────────────────────────────────────── */
#overlay {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(7, 7, 15, 0.92);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: fadeOut 0.9s ease-out 0.25s forwards;
    pointer-events: none;
}

#overlay-title {
    font-family: var(--font-display);
    font-size: var(--type-hero);
    font-weight: 700;
    letter-spacing: 24px;
    color: var(--accent);
    text-shadow: 0 0 60px rgba(0, 229, 204, 0.4), 0 0 120px rgba(0, 229, 204, 0.15);
}

#overlay-sub {
    font-size: 13px;
    font-weight: 300;
    letter-spacing: 8px;
    color: var(--text-dim);
    margin-top: 12px;
    text-transform: uppercase;
}

@keyframes fadeOut {
    0%   { opacity: 1; }
    70%  { opacity: 1; }
    100% { opacity: 0; visibility: hidden; }
}

/* ── Panel base ─────────────────────────────────────────────────────── */
.panel {
    position: fixed;
    z-index: 120;
    background: var(--bg-panel);
    background-image: var(--panel-grid);
    border: 1px var(--theme-panel-border-style) var(--border);
    box-shadow: var(--theme-panel-shadow);
    backdrop-filter: blur(var(--panel-blur));
    -webkit-backdrop-filter: blur(var(--panel-blur));
    border-radius: var(--panel-radius);
    padding: var(--panel-padding);
    transition:
        border-color var(--motion-base) var(--motion-ease),
        box-shadow var(--motion-base) var(--motion-ease),
        transform var(--motion-base) var(--motion-ease),
        opacity var(--motion-fast) var(--motion-ease);
}

.panel:hover {
    border-color: var(--border-hover);
    box-shadow: var(--theme-panel-hover-shadow);
}

.panel-header {
    font-family: var(--font-display);
    font-size: var(--type-sm);
    font-weight: 600;
    letter-spacing: var(--theme-heading-track);
    color: var(--accent);
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border);
}

.panel-label {
    display: block;
    font-size: var(--type-xs);
    font-weight: 500;
    letter-spacing: 2.4px;
    color: var(--text-dim);
    margin-top: 14px;
    margin-bottom: 8px;
    text-transform: uppercase;
}

.panel-label span {
    color: var(--accent);
    font-weight: 600;
}

/* ── Top Bar ────────────────────────────────────────────────────────── */
#top-bar {
    top: var(--layout-top);
    left: 50%;
    transform: translateX(-50%);
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: stretch;
    gap: 10px;
    padding: 12px 18px;
    width: min(1080px, calc(100vw - (var(--layout-edge) * 2)));
}

#top-bar .panel-section {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    flex-wrap: wrap;
    gap: 8px;
    width: 100%;
    min-height: 58px;
    padding: 10px 12px;
    border: 1px solid color-mix(in srgb, var(--accent) 14%, transparent);
    border-radius: calc(var(--panel-radius) - 3px);
    background: color-mix(in srgb, var(--bg-panel) 74%, transparent);
}

#top-bar .panel-section-system {
    justify-content: center;
}

#top-bar .section-kicker {
    display: inline-block;
    width: 100%;
    margin-bottom: 2px;
    color: var(--text-dim);
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 2.4px;
}

#top-bar #btn-wallpaper-toggle,
#top-bar #btn-present {
    border-color: color-mix(in srgb, var(--accent) 44%, var(--border) 56%);
}

#top-bar #btn-random-rule {
    border-color: color-mix(in srgb, var(--accent) 68%, var(--border) 32%);
    background: color-mix(in srgb, var(--accent) 12%, transparent);
}

#top-bar .panel-label {
    margin: 0;
}

/* ── Left Panel ─────────────────────────────────────────────────────── */
#left-panel {
    top: var(--workspace-top);
    left: var(--layout-edge);
    width: var(--panel-width-left);
    max-height: calc(100vh - var(--workspace-top) - var(--workspace-bottom-reserve));
    overflow-y: auto;
}

/* ── Right Panel ────────────────────────────────────────────────────── */
#right-panel {
    top: var(--workspace-top);
    right: var(--layout-edge);
    width: var(--panel-width-right);
    max-height: calc(100vh - var(--workspace-top) - var(--workspace-bottom-reserve));
    overflow-y: auto;
}

#zoom-panel {
    right: var(--layout-edge);
    bottom: calc(var(--layout-bottom) + var(--zoom-bottom-clearance));
    width: 188px;
    z-index: 110;
}

#left-panel::-webkit-scrollbar,
#right-panel::-webkit-scrollbar {
    width: 3px;
}
#left-panel::-webkit-scrollbar-track,
#right-panel::-webkit-scrollbar-track {
    background: transparent;
}
#left-panel::-webkit-scrollbar-thumb,
#right-panel::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 1px;
}

/* ── Bottom Bar ─────────────────────────────────────────────────────── */
#bottom-bar {
    bottom: var(--layout-bottom);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 24px;
    padding: 12px 18px;
    width: min(1140px, calc(100vw - (var(--layout-edge) * 2)));
}

#bottom-bar .panel-section {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
}

#bottom-bar .panel-label {
    margin: 0;
    white-space: nowrap;
}

#bottom-bar .controls {
    flex: 1 1 360px;
}

#bottom-bar .stats {
    justify-content: flex-end;
    flex: 1 1 240px;
}

.stats {
    gap: 14px !important;
}

.stat {
    font-size: var(--type-xs);
    letter-spacing: 1.2px;
    color: var(--text-dim);
    white-space: nowrap;
}

.stat-val {
    color: var(--accent);
    font-weight: 600;
    font-variant-numeric: tabular-nums;
}

/* ── Buttons ────────────────────────────────────────────────────────── */
.btn {
    font-family: var(--font-display);
    font-size: var(--type-sm);
    font-weight: 500;
    letter-spacing: 1.2px;
    min-height: var(--control-height);
    padding: 10px 14px;
    background: var(--theme-btn-bg);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: var(--theme-btn-radius);
    cursor: pointer;
    transition:
        background var(--motion-fast) var(--motion-ease),
        border-color var(--motion-fast) var(--motion-ease),
        color var(--motion-fast) var(--motion-ease),
        transform var(--motion-fast) var(--motion-ease);
    white-space: nowrap;
    letter-spacing: var(--theme-button-track);
}

.btn:hover {
    background: var(--theme-btn-hover-bg);
    border-color: var(--accent);
    color: #fff;
}

.btn:active {
    transform: scale(0.96);
}

.btn.accent {
    border-color: var(--accent);
    color: var(--accent);
}

.btn.accent:hover {
    background: var(--theme-btn-accent-hover-bg);
    color: var(--theme-btn-accent-hover-text);
}

.btn:focus-visible {
    outline: 2px solid color-mix(in srgb, var(--accent) 75%, white 25%);
    outline-offset: 2px;
}

/* ── Mode toggle ────────────────────────────────────────────────────── */
.mode-toggle {
    display: flex;
    gap: 0;
    border: 1px solid var(--border);
    border-radius: var(--theme-mode-radius);
    overflow: hidden;
}

.mode-btn {
    font-family: var(--font-display);
    font-size: var(--type-xs);
    font-weight: 500;
    letter-spacing: var(--theme-button-track);
    min-height: var(--control-height);
    padding: 10px 12px;
    background: transparent;
    color: var(--text-dim);
    border: none;
    border-right: 1px solid var(--border);
    cursor: pointer;
    transition: background var(--motion-fast) var(--motion-ease), color var(--motion-fast) var(--motion-ease);
    flex: 1;
    text-align: center;
}

.mode-btn:last-child {
    border-right: none;
}

.mode-btn:hover {
    color: var(--text);
    background: var(--theme-control-surface);
}

.mode-btn.active {
    color: var(--bg);
    background: var(--accent);
    font-weight: 600;
}

.mode-btn:focus-visible {
    outline: 2px solid color-mix(in srgb, var(--accent) 70%, white 30%);
    outline-offset: -2px;
}

/* ── Sliders ────────────────────────────────────────────────────────── */
input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    background: color-mix(in srgb, var(--accent) 16%, transparent);
    border-radius: 1px;
    outline: none;
    margin: 8px 0 2px;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    background: var(--accent);
    border: none;
    border-radius: var(--theme-slider-thumb-radius);
    cursor: pointer;
    transition: transform var(--motion-fast) var(--motion-ease);
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.3);
}

input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: var(--accent);
    border: none;
    border-radius: var(--theme-slider-thumb-radius);
    cursor: pointer;
}

/* ── Select ─────────────────────────────────────────────────────────── */
select {
    font-family: var(--font-ui);
    font-size: var(--type-sm);
    min-height: var(--control-height);
    padding: 10px 12px;
    background: var(--theme-control-surface);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: var(--theme-btn-radius);
    outline: none;
    cursor: pointer;
    width: 100%;
    transition: border-color var(--motion-fast) var(--motion-ease);
}

select:hover, select:focus {
    border-color: var(--accent);
}

select:focus-visible {
    outline: 2px solid color-mix(in srgb, var(--accent) 72%, white 28%);
    outline-offset: 2px;
}

select option {
    background: var(--bg);
    color: var(--text);
}

/* ── Checkbox row (B/S rules) ───────────────────────────────────────── */
.checkbox-row {
    display: flex;
    gap: 6px;
    margin: 6px 0;
    flex-wrap: wrap;
}

.cb-item {
    position: relative;
    width: 32px;
    height: 32px;
}

.cb-item input[type="checkbox"] {
    position: absolute;
    opacity: 0;
    width: 100%;
    height: 100%;
    cursor: pointer;
    z-index: 1;
    margin: 0;
}

.cb-item label {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    font-size: var(--type-xs);
    font-weight: 500;
    color: var(--text-dim);
    border: 1px solid var(--border);
    border-radius: var(--theme-btn-radius);
    cursor: pointer;
    transition: all var(--motion-fast) var(--motion-ease);
}

.cb-item input[type="checkbox"]:checked + label {
    background: var(--accent);
    color: var(--bg);
    border-color: var(--accent);
    font-weight: 700;
}

.cb-item:hover label {
    border-color: var(--accent);
}

.cb-item input[type="checkbox"]:focus-visible + label {
    outline: 2px solid color-mix(in srgb, var(--accent) 72%, white 28%);
    outline-offset: 2px;
}

#theme-badge {
    position: fixed;
    right: 22px;
    bottom: 22px;
    z-index: 150;
    padding: 10px 14px;
    border-radius: var(--radius-pill);
    border: 1px solid var(--border);
    background: color-mix(in srgb, var(--bg-panel) 92%, black 8%);
    color: var(--accent);
    font-size: var(--type-sm);
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
    opacity: 0;
    transform: translateY(10px);
    pointer-events: none;
    transition: opacity var(--motion-base) var(--motion-ease), transform var(--motion-base) var(--motion-ease);
    box-shadow: 0 0 24px var(--shadow-accent);
}

#theme-badge.show {
    opacity: 1;
    transform: translateY(0);
}

#about-modal {
    position: fixed;
    inset: 0;
    z-index: 220;
    display: none;
}

#about-modal.open {
    display: block;
}

#about-backdrop {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at top left, color-mix(in srgb, var(--accent) 12%, transparent), transparent 34%),
        rgba(5, 8, 12, 0.74);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

#about-dialog {
    position: absolute;
    top: 50%;
    left: 50%;
    width: min(880px, calc(100vw - 32px));
    max-height: min(720px, calc(100vh - 40px));
    transform: translate(-50%, -50%);
    overflow: auto;
    border: 1px solid var(--border);
    border-radius: 18px;
    background:
        linear-gradient(180deg, color-mix(in srgb, var(--bg-panel) 96%, #fff 4%), color-mix(in srgb, var(--bg-panel) 92%, #000 8%));
    box-shadow: 0 24px 72px rgba(0, 0, 0, 0.42), 0 0 40px var(--shadow-accent);
    padding: 28px;
}

.about-top {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 18px;
    margin-bottom: 24px;
}

.about-kicker {
    font-size: 11px;
    letter-spacing: 3px;
    color: var(--accent);
    margin-bottom: 6px;
}

#about-title {
    font-size: var(--type-xl);
    line-height: 1.1;
    letter-spacing: 1px;
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
}

.about-section {
    padding: 18px;
    border: 1px solid var(--border);
    border-radius: 14px;
    background: color-mix(in srgb, var(--bg-panel) 88%, black 12%);
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.02);
}

.about-section h3 {
    font-size: var(--type-lg);
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 10px;
}

.about-section p {
    font-size: var(--type-md);
    color: var(--text);
    margin-bottom: 10px;
}

.about-section p:last-child {
    margin-bottom: 0;
}

.about-section code {
    font-family: var(--font);
    color: var(--accent);
}

/* ── Responsive ─────────────────────────────────────────────────────── */
@media (max-width: 900px) and (min-width: 761px) {
    :root {
        --panel-w-left: 212px;
        --panel-w-right: 262px;
        --panel-padding: 16px;
        --control-height: 36px;
        --type-hero: 42px;
        --topbar-stack-h: 308px;
        --workspace-bottom-reserve: 196px;
        --layout-edge: 12px;
    }
    .about-grid { grid-template-columns: 1fr; }
    #zoom-panel {
        right: var(--layout-edge);
        bottom: calc(var(--layout-bottom) + var(--zoom-bottom-clearance));
    }
    #overlay-title { letter-spacing: 12px; }
}

@media (max-width: 1220px) and (min-width: 901px) {
    :root {
        --panel-w-left: 228px;
        --panel-w-right: 286px;
        --topbar-stack-h: 236px;
        --workspace-bottom-reserve: 184px;
        --layout-edge: 12px;
    }

    #bottom-bar {
        gap: 16px;
    }

    #top-bar {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    #top-bar .panel-section-system {
        grid-column: 1 / -1;
    }

    #bottom-bar .stats {
        justify-content: flex-start;
    }
}

@media (max-height: 860px) and (min-width: 761px) {
    :root {
        --topbar-stack-h: 300px;
        --workspace-bottom-reserve: 210px;
    }
}

@media (max-width: 760px) {
    :root {
        --panel-padding: 18px;
        --control-height: var(--control-h-mobile);
    }

    html, body {
        font-size: 15px;
    }

    .mobile-only {
        display: block;
    }

    #zoom-panel {
        display: none;
    }

    #mobile-sheet-backdrop {
        position: fixed;
        inset: 0;
        z-index: 140;
        background: rgba(5, 8, 12, 0.48);
        backdrop-filter: blur(4px);
        -webkit-backdrop-filter: blur(4px);
        opacity: 0;
        pointer-events: none;
        transition: opacity 0.18s ease;
        display: block;
    }

    #mobile-sheet-backdrop.open {
        opacity: 1;
        pointer-events: auto;
    }

    #mobile-bar {
        position: fixed;
        left: 10px;
        right: 10px;
        bottom: calc(env(safe-area-inset-bottom, 0px) + 10px);
        z-index: 170;
        display: grid;
        grid-template-columns: repeat(5, minmax(0, 1fr));
        gap: 8px;
        padding: 10px;
        border-radius: 18px;
    }

    #mobile-bar .btn {
        min-height: 48px;
        padding: 10px 6px;
        font-size: 11px;
        letter-spacing: 1.6px;
        border-radius: 12px;
    }

    #top-bar,
    #left-panel,
    #right-panel,
    #bottom-bar {
        top: auto;
        left: 10px;
        right: 10px;
        bottom: calc(env(safe-area-inset-bottom, 0px) + 82px);
        width: auto;
        max-height: min(68vh, calc(100vh - 120px));
        overflow-y: auto;
        transform: translateY(calc(100% + 28px));
        opacity: 0;
        pointer-events: none;
        transition: transform 0.2s ease, opacity 0.2s ease;
        z-index: 160;
    }

    #top-bar.mobile-open,
    #left-panel.mobile-open,
    #right-panel.mobile-open,
    #bottom-bar.mobile-open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
    }

    #top-bar {
        display: flex;
        flex-direction: column;
        left: 10px;
        transform: translateY(calc(100% + 28px));
    }

    #top-bar.mobile-open {
        transform: translateY(0);
    }

    #top-bar .panel-section,
    #bottom-bar,
    #bottom-bar .panel-section {
        width: 100%;
        flex-wrap: wrap;
    }

    #top-bar .btn,
    #bottom-bar .btn {
        flex: 1 1 calc(50% - 8px);
    }

    #left-panel,
    #right-panel {
        max-height: min(72vh, calc(100vh - 120px));
    }

    #bottom-bar {
        gap: 16px;
    }

    .btn {
        font-size: 13px;
        padding: 12px 14px;
        border-radius: 12px;
    }

    .mode-btn {
        font-size: 12px;
        min-height: 46px;
        padding: 12px 10px;
    }

    input[type="range"] {
        height: 10px;
        margin: 12px 0 6px;
    }

    input[type="range"]::-webkit-slider-thumb {
        width: 24px;
        height: 24px;
        border-radius: 999px;
    }

    input[type="range"]::-moz-range-thumb {
        width: 24px;
        height: 24px;
        border-radius: 999px;
    }

    select {
        font-size: 14px;
        min-height: 46px;
    }

    .checkbox-row {
        gap: 8px;
    }

    .cb-item {
        width: 38px;
        height: 38px;
    }

    #theme-badge {
        right: 14px;
        bottom: calc(env(safe-area-inset-bottom, 0px) + 76px);
    }

    #about-dialog {
        inset: auto 0 0 0;
        width: 100vw;
        max-height: 86vh;
        transform: none;
        border-radius: 24px 24px 0 0;
        padding: 22px 18px 28px;
    }

    .about-top {
        flex-direction: column;
        align-items: stretch;
    }

    #about-title {
        font-size: 24px;
    }

    .about-grid {
        grid-template-columns: 1fr;
    }

    body.presentation #btn-exit-view {
        top: 12px;
        right: 12px;
    }
}

@media (prefers-reduced-motion: reduce) {
    html, body,
    .panel,
    .btn,
    .mode-btn,
    #theme-badge {
        transition: none !important;
    }

    body.controls-reveal #top-bar,
    body.controls-reveal #left-panel,
    body.controls-reveal #right-panel,
    body.controls-reveal #bottom-bar,
    body.controls-reveal #zoom-panel,
    body.controls-reveal #mobile-bar {
        animation: none !important;
    }
}