/* ====================================
   CSS Reset & Base Styles
   ==================================== */

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

:root {
    /* Nature Tech Palette */
    --bg-global-start: #0F1510;
    --bg-global-end: #050805;

    --bg-surface: #1A221E;
    --bg-surface-hover: #202a25;
    --bg-input: #252C28;

    /* Accents */
    --accent-primary: #2FD45E;
    /* Neon Green */
    --accent-hover: #33FF66;
    --accent-dim: #1a5c2e;

    /* Text */
    --text-main: #FFFFFF;
    --text-secondary: #8E9B95;
    --text-muted: #5c6660;
    --text-on-accent: #050805;
    /* Black/Dark for contrast on neon */

    /* Semantic */
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #06b6d4;

    /* Borders */
    --border-fine: rgba(255, 255, 255, 0.05);
    --border-focus: #2FD45E;

    /* Radius */
    --radius-card: 24px;
    --radius-btn: 999px;
    /* Pill shape */
    --radius-sm: 8px;

    /* Shadows & Glows */
    --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.2);
    --shadow-glow-primary: 0 4px 15px rgba(47, 212, 94, 0.3);
    --shadow-glow-subtle: 0 0 20px rgba(47, 212, 94, 0.1);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
}

body {
    font-family: 'Inter', 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    background: linear-gradient(to bottom, var(--bg-global-start), var(--bg-global-end));
    color: var(--text-main);
    height: 100vh;
    margin: 0;
    padding: 0;
    overflow: hidden;
}

/* ====================================
   Root Grid — 4 rows × 2 cols
   ==================================== */

.app {
    height: 100vh;
    display: grid;
    grid-template-rows: 48px 1fr 160px 28px;
    gap: 10px;
    padding: 10px;
}

/* Header slim */
.head {
    background: var(--bg-surface);
    border: 1px solid var(--border-fine);
    border-radius: 14px;
    padding: 0 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    min-width: 0;
}

.head h1 {
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 0.3px;
    text-shadow: none;
    margin: 0;
    white-space: nowrap;
}

.head .head-dot { color: var(--accent-primary); margin-right: 4px; }
.head .head-sub { color: var(--text-muted); font-weight: 400; margin-left: 4px; }

.head-meta {
    font-size: 11px;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 8px;
    flex: 1;
    justify-content: center;
    font-variant-numeric: tabular-nums;
    overflow: hidden;
    white-space: nowrap;
}
.head-meta .head-sep { color: var(--text-muted); }
.head-meta #head-rule-tag { color: var(--accent-primary); font-weight: 600; }
.head-meta #head-gen-value { color: var(--text-main); font-weight: 600; }

.head-actions { display: flex; gap: 8px; }

.icon-btn {
    width: 28px;
    height: 28px;
    border-radius: 8px;
    background: var(--bg-input);
    border: 1px solid var(--border-fine);
    color: var(--text-secondary);
    font-size: 13px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s, color 0.2s;
}
.icon-btn:hover { background: var(--bg-surface-hover); color: var(--text-main); }

/* Main: canvas left + rail right */
.main {
    display: grid;
    grid-template-columns: 1fr 360px;
    gap: 10px;
    min-height: 0;
    position: relative;
}

.canvas-zone {
    background: var(--bg-surface);
    border: 1px solid var(--border-fine);
    border-radius: 18px;
    padding: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    min-width: 0;
    min-height: 0;
}

.canvas-zone::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at center, rgba(47, 212, 94, 0.06), transparent 65%);
    pointer-events: none;
}

.canvas-label {
    position: absolute;
    top: 12px;
    left: 16px;
    font-size: 10px;
    color: var(--text-muted);
    letter-spacing: 0.5px;
    text-transform: uppercase;
    z-index: 1;
}

#gameCanvas {
    width: 100%;
    height: 100%;
    display: block;
    border-radius: 10px;
    border: 1px solid rgba(47, 212, 94, 0.15);
    box-shadow: 0 0 60px rgba(47, 212, 94, 0.08);
    cursor: crosshair;
    transition: box-shadow 0.3s ease;
    image-rendering: pixelated;
}

#gameCanvas:hover { box-shadow: 0 0 80px rgba(47, 212, 94, 0.15); }

/* Rail (right column) */
.rail {
    display: flex;
    flex-direction: column;
    gap: 10px;
    min-height: 0;
    overflow-y: auto;
    overflow-x: hidden;
    padding-right: 2px;
}
.rail::-webkit-scrollbar { width: 6px; }
.rail::-webkit-scrollbar-track { background: transparent; }
.rail::-webkit-scrollbar-thumb { background: var(--bg-surface-hover); border-radius: 999px; }

/* Card base */
.card {
    background: var(--bg-surface);
    border: 1px solid var(--border-fine);
    border-radius: 18px;
    padding: 14px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    min-width: 0;
}

.card-title {
    color: var(--text-secondary);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.6px;
    text-transform: uppercase;
    margin: 0;
    padding: 0;
    border: none;
}

/* Dashboard bottom: stats + graph */
.dashboard {
    display: grid;
    grid-template-columns: minmax(380px, 38%) 1fr;
    gap: 10px;
    min-height: 0;
}

.stats-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-fine);
    border-radius: 18px;
    padding: 14px 16px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: auto auto;
    gap: 10px 18px;
    align-content: center;
}

.chip { display: flex; flex-direction: column; gap: 3px; min-width: 0; }
.chip-lbl {
    font-size: 9px;
    text-transform: uppercase;
    letter-spacing: 0.6px;
    color: var(--text-muted);
    display: flex; align-items: center; gap: 5px;
    white-space: nowrap;
}
.chip-lbl .icon { font-size: 11px; }
.chip-val {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-main);
    font-variant-numeric: tabular-nums;
    line-height: 1.1;
}
.chip-val.births { color: var(--accent-primary); text-shadow: 0 0 12px rgba(47, 212, 94, 0.3); }
.chip-val.deaths { color: var(--danger); }
.chip-val.neutral { color: var(--text-secondary); }

.graph-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-fine);
    border-radius: 18px;
    padding: 12px 16px 8px 16px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    min-height: 0;
    position: relative;
}
.graph-head { display: flex; justify-content: space-between; align-items: center; gap: 10px; }
.graph-title {
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.6px;
    color: var(--text-secondary);
    display: flex; align-items: center; gap: 8px;
}
.graph-title::before {
    content: '';
    width: 6px; height: 6px;
    border-radius: 50%;
    background: var(--accent-primary);
    box-shadow: 0 0 8px var(--accent-primary);
}
.graph-legend {
    font-size: 10px;
    color: var(--text-muted);
    font-variant-numeric: tabular-nums;
}
.graph-legend strong { color: var(--text-main); margin: 0 2px; }
.graph-body { flex: 1; min-height: 0; position: relative; }
.graph-body canvas {
    width: 100%;
    height: 100%;
    display: block;
}

/* Footer slim */
.foot {
    background: var(--bg-surface);
    border: 1px solid var(--border-fine);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 14px;
    font-size: 10px;
    color: var(--text-muted);
}
.foot-right { color: var(--accent-primary); opacity: 0.75; font-weight: 600; letter-spacing: 0.3px; }

/* ====================================
   Controls Panel
   ==================================== */

.controls-panel {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.control-buttons {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xs);
}

/* ====================================
   Buttons
   ==================================== */

.btn {
    padding: var(--spacing-xs) var(--spacing-sm);
    border: none;
    border-radius: var(--radius-btn);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    box-shadow: none;
    position: relative;
    overflow: hidden;
}

.btn:hover {
    transform: translateY(-2px);
}

.btn-primary {
    background: var(--accent-primary);
    color: var(--text-on-accent);
    box-shadow: var(--shadow-glow-primary);
}

.btn-primary:hover {
    background: var(--accent-hover);
    box-shadow: 0 6px 20px rgba(47, 212, 94, 0.5);
}

.btn-warning {
    background: rgba(245, 158, 11, 0.2);
    color: var(--warning);
    border: 1px solid rgba(245, 158, 11, 0.5);
}

.btn-warning:hover {
    background: rgba(245, 158, 11, 0.3);
    box-shadow: 0 0 15px rgba(245, 158, 11, 0.2);
}

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

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
}

.btn-danger {
    background: rgba(239, 68, 68, 0.2);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.5);
}

.btn-danger:hover {
    background: rgba(239, 68, 68, 0.3);
    box-shadow: 0 0 15px rgba(239, 68, 68, 0.2);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-sm {
    padding: 0.4rem 0.8rem;
    font-size: 0.8rem;
}

.btn-full {
    width: 100%;
}

/* ====================================
   Panel Sections
   ==================================== */

.stats,
.graph-container,
.controls-advanced,
.instructions,
.rule-selector-panel,
.mode-selector-panel,
.pattern-library-panel {
    background: var(--bg-surface);
    padding: var(--spacing-sm);
    border-radius: var(--radius-card);
    border: 1px solid var(--border-fine);
}

/* Mode selector panel (Tier A) */
.mode-selector-panel {
    margin-bottom: var(--spacing-sm);
}

.mode-selector-panel select#mode-select {
    width: 100%;
    padding: 6px 8px;
    background: var(--bg-input);
    color: var(--text-main);
    border: 1px solid var(--border-fine);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-xs);
}

.mode-description {
    color: var(--text-secondary);
    font-size: 0.78rem;
    font-style: italic;
    margin-bottom: var(--spacing-xs);
    line-height: 1.4;
}

.mode-params {
    border-top: 1px dashed var(--border-fine);
    padding-top: var(--spacing-xs);
    margin-top: var(--spacing-xs);
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.mode-params[hidden] {
    display: none;
}

.mode-param-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 8px;
}

.mode-param-row label {
    color: var(--text-secondary);
    font-size: 0.8rem;
    flex-shrink: 0;
}

.mode-mini-select,
.mode-mini-input {
    flex: 1;
    padding: 4px 6px;
    background: var(--bg-input);
    color: var(--text-main);
    border: 1px solid var(--border-fine);
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    min-width: 0;
}

.mode-mini-input {
    max-width: 80px;
}

.mode-hint {
    color: var(--text-muted);
    font-size: 0.75rem;
    font-style: italic;
    line-height: 1.4;
    padding: 4px 0;
}

.cyclic-status {
    color: var(--text-secondary);
    font-size: 0.8rem;
    padding: 6px 8px;
    background: rgba(47, 212, 94, 0.08);
    border-radius: var(--radius-sm);
    margin-top: 4px;
}

.cyclic-status strong {
    color: var(--accent-primary);
}

.legend-dot {
    display: inline-block;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    vertical-align: middle;
    margin: 0 2px;
}

.panel-title {
    color: var(--text-main);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    padding-bottom: var(--spacing-xs);
    border-bottom: 1px solid var(--border-fine);
}

/* ====================================
   Stats Display
   ==================================== */

.stat-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-xs);
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-sm);
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.8rem;
    display: flex;
    align-items: center;
    gap: 6px;
}

.stat-label .icon {
    font-size: 1rem;
}

.stat-value {
    color: var(--text-main);
    font-size: 1rem;
    font-weight: 700;
}

.stat-value.births {
    color: var(--accent-primary);
    text-shadow: 0 0 10px rgba(47, 212, 94, 0.3);
}

.stat-value.deaths {
    color: var(--danger);
}

/* ====================================
   Rule Selector Panel
   ==================================== */

.rule-badge {
    background: rgba(47, 212, 94, 0.1);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-xs);
    border: 1px solid rgba(47, 212, 94, 0.3);
    margin-bottom: var(--spacing-xs);
}

.rule-badge strong {
    color: var(--accent-primary);
    font-size: 0.9rem;
}

.rule-badge code {
    font-family: 'Consolas', monospace;
    background: rgba(0, 0, 0, 0.3);
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.8rem;
}

.rule-dropdown {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.rule-dropdown label {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.rule-dropdown select {
    padding: var(--spacing-xs);
    background: var(--bg-input);
    color: var(--text-main);
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.rule-dropdown select:hover,
.rule-dropdown select:focus {
    border-color: var(--accent-primary);
    outline: none;
}

.rule-dropdown.disabled {
    opacity: 0.5;
    pointer-events: none;
}

.rule-dropdown select:disabled {
    cursor: not-allowed;
    opacity: 0.6;
}

.custom-rule-builder {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    padding-top: var(--spacing-xs);
    border-top: 1px solid var(--border-fine);
    margin-top: var(--spacing-xs);
}

.rule-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.rule-label {
    color: var(--accent-primary);
    font-weight: 600;
    font-size: 0.85rem;
}

.checkbox-grid {
    display: grid;
    grid-template-columns: repeat(9, 1fr);
    gap: 4px;
}

.checkbox-grid label {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    padding: 4px;
    background: var(--bg-input);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.checkbox-grid label:hover {
    background: var(--bg-surface-hover);
}

.checkbox-grid input[type="checkbox"] {
    cursor: pointer;
    width: 14px;
    height: 14px;
    accent-color: var(--accent-primary);
}

.checkbox-grid label:has(input:checked) {
    background: var(--accent-primary);
    color: var(--text-on-accent);
    font-weight: 700;
    box-shadow: 0 0 10px rgba(47, 212, 94, 0.4);
}

/* ====================================
   Advanced Controls
   ==================================== */

.controls-advanced {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    background: transparent;
    border: none;
    padding: 0;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    background: var(--bg-surface);
    padding: var(--spacing-sm);
    border-radius: var(--radius-card);
    border: 1px solid var(--border-fine);
}

.group-label {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-bottom: 4px;
}

.input-row {
    display: flex;
    gap: var(--spacing-xs);
    align-items: center;
}

.input-wrapper {
    display: flex;
    align-items: center;
    gap: 4px;
    flex: 1;
}

.input-wrapper label {
    color: var(--text-secondary);
    font-size: 0.8rem;
}

.input-wrapper input[type="number"] {
    width: 100%;
    padding: var(--spacing-xs);
    background: var(--bg-input);
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    color: var(--text-main);
    font-size: 0.9rem;
}

.input-wrapper input[type="number"]:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.control-slider {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.control-slider label {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.control-slider label span {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.control-slider label strong {
    color: var(--accent-primary);
    font-size: 0.9rem;
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 4px;
    border-radius: 2px;
    background: var(--bg-input);
    outline: none;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent-primary);
    cursor: pointer;
    box-shadow: 0 0 10px rgba(47, 212, 94, 0.4);
    transition: all 0.2s ease;
    margin-top: -6px;
}

input[type="range"]::-webkit-slider-runnable-track {
    height: 4px;
    background: var(--bg-input);
    border-radius: 2px;
}

input[type="range"]:hover::-webkit-slider-thumb {
    transform: scale(1.2);
    box-shadow: 0 0 15px rgba(47, 212, 94, 0.6);
}

.slider-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.7rem;
    color: var(--text-muted);
}

.instructions ul {
    list-style: none;
}

.instructions li {
    padding: var(--spacing-xs) 0;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.85rem;
}

kbd {
    background: var(--bg-input);
    border: 1px solid var(--border-fine);
    border-radius: 4px;
    padding: 2px 6px;
    font-family: monospace;
    font-size: 0.8rem;
    color: var(--text-main);
}

/* ====================================
   Pattern Library Panel - Tabs
   ==================================== */

.pattern-library-panel {
    min-height: 0;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.pattern-tabs {
    display: flex;
    gap: 2px;
    margin-bottom: var(--spacing-xs);
    flex-wrap: wrap;
}

.pattern-tab {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--bg-input);
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.pattern-tab:hover {
    background: var(--bg-surface-hover);
    color: var(--text-main);
}

.pattern-tab.active {
    background: var(--accent-primary);
    color: var(--text-on-accent);
    font-weight: 600;
}

.pattern-list {
    flex: 1;
    overflow-y: auto;
    background: var(--bg-input);
    border-radius: var(--radius-sm);
    padding: var(--spacing-xs);
    margin-bottom: var(--spacing-xs);
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    align-content: flex-start;
    min-height: 0;
}

.pattern-item {
    padding: var(--spacing-xs) var(--spacing-sm);
    cursor: pointer;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    transition: all 0.2s;
    background: var(--bg-surface);
    border: 1px solid var(--border-fine);
    font-size: 0.8rem;
    white-space: nowrap;
}

.pattern-item:hover {
    background: var(--bg-surface-hover);
    color: var(--text-main);
    border-color: var(--accent-dim);
}

.pattern-item.active {
    background: rgba(47, 212, 94, 0.2);
    color: var(--accent-primary);
    border-color: var(--accent-primary);
}

.import-export-section {
    display: flex;
    gap: var(--spacing-sm);
    border-top: 1px solid var(--border-fine);
    padding-top: var(--spacing-xs);
    align-items: stretch;
}

.io-input {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
    min-width: 0;
}

.panel-subtitle {
    color: var(--text-secondary);
    font-size: 0.75rem;
    font-weight: 600;
}

textarea#rle-io {
    width: 100%;
    flex: 1;
    padding: var(--spacing-xs);
    background: var(--bg-input);
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    color: var(--text-main);
    font-family: monospace;
    font-size: 0.75rem;
    resize: none;
}

textarea#rle-io:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.io-buttons {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.io-buttons .btn {
    white-space: nowrap;
}

/* ====================================
   Responsive Media Queries
   ==================================== */

@media (max-width: 1024px) {
    main {
        grid-template-columns: 1fr;
    }

    .top-dashboard {
        flex-direction: column;
    }

    .stats-panel {
        flex: none;
        width: 100%;
    }
}

/* ====================================
   Toggle Switch
   ==================================== */

.toggle-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.toggle-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    cursor: pointer;
}

.toggle-label.active {
    color: var(--accent-primary);
    font-weight: 600;
}

.toggle-switch {
    position: relative;
    display: inline-block;
    width: 48px;
    height: 24px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--bg-input);
    transition: .4s;
    border-radius: 24px;
    border: 1px solid var(--border-fine);
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 2px;
    background-color: var(--text-secondary);
    transition: .4s;
    border-radius: 50%;
}

input:checked+.toggle-slider {
    background-color: rgba(47, 212, 94, 0.2);
    border-color: var(--accent-primary);
}

input:checked+.toggle-slider:before {
    transform: translateX(24px);
    background-color: var(--accent-primary);
    box-shadow: 0 0 10px rgba(47, 212, 94, 0.5);
}

/* ====================================
   Disabled Checkboxes
   ==================================== */

.checkbox-grid.disabled {
    opacity: 0.5;
    pointer-events: none;
    /* Prevent interaction */
}

.checkbox-grid.disabled label {
    cursor: not-allowed;
}

.checkbox-grid.disabled label:has(input:checked) {
    background: var(--text-secondary);
    /* Grey out checked items */
    color: var(--bg-deep);
    box-shadow: none;
}

/* ===== Help cards ===== */
.help-card {
    --accent: hsl(0, 0%, 40%);
    border-left: 3px solid var(--accent);
    background: rgba(255, 255, 255, 0.03);
    border-radius: 4px;
    padding: 0.5rem 0.7rem;
    margin-top: 0.5rem;
    font-size: 0.85rem;
    line-height: 1.4;
}
.help-card__header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.help-card__emoji {
    font-size: 1.3rem;
    line-height: 1;
}
.help-card__titles {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}
.help-card__title {
    color: #e8e8e8;
    font-size: 0.95rem;
}
.help-card__sub {
    color: var(--accent);
    font-size: 0.75rem;
    background: transparent;
    padding: 0;
}
.help-card__toggle {
    background: rgba(255, 255, 255, 0.08);
    border: none;
    color: #ddd;
    width: 1.5rem;
    height: 1.5rem;
    border-radius: 50%;
    cursor: pointer;
    font-weight: bold;
    flex-shrink: 0;
}
.help-card__toggle:hover { background: rgba(255, 255, 255, 0.18); }
.help-card__synthesis {
    margin: 0.4rem 0 0;
    color: #cfcfcf;
}
.help-card__tagline {
    display: block;
    color: #fff;
    font-weight: 600;
    margin-bottom: 0.2rem;
}
.help-card__expanded {
    margin-top: 0.6rem;
    display: flex;
    gap: 0.7rem;
    align-items: flex-start;
}
.help-card__expanded[hidden] { display: none; }
.help-card__details {
    flex: 1;
    color: #b8b8b8;
    font-size: 0.8rem;
}
.help-card__details p {
    margin: 0 0 0.4rem;
}
.help-card__wiki {
    color: var(--accent);
    text-decoration: none;
    font-size: 0.78rem;
}
.help-card__wiki:hover { text-decoration: underline; }
.mini-preview {
    background: #000;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    image-rendering: pixelated;
    flex-shrink: 0;
}

/* ===== Param help ===== */
.param-help__btn {
    margin-left: 0.3rem;
    width: 1rem;
    height: 1rem;
    border-radius: 50%;
    border: none;
    background: rgba(255, 255, 255, 0.12);
    color: #ddd;
    font-size: 0.7rem;
    cursor: pointer;
    padding: 0;
    line-height: 1;
}
.param-help__btn:hover { background: rgba(255, 255, 255, 0.22); }
.param-help__popover {
    position: absolute;
    max-width: 16rem;
    background: #1a1a1a;
    color: #e8e8e8;
    border: 1px solid #444;
    border-radius: 4px;
    padding: 0.5rem 0.7rem;
    font-size: 0.78rem;
    line-height: 1.35;
    z-index: 1000;
    box-shadow: 0 4px 14px rgba(0,0,0,0.5);
}

/* ===== Custom-rule classifier tag ===== */
.rule-tag {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.04);
    border-left: 3px solid var(--accent, #888);
    padding: 0.4rem 0.6rem;
    margin-bottom: 0.5rem;
    border-radius: 3px;
    font-size: 0.82rem;
    color: #d8d8d8;
}
.rule-tag__emoji { font-size: 1.1rem; }
.rule-tag__label { font-weight: 600; color: #fff; }
.rule-tag__hint  { color: #b8b8b8; font-size: 0.78rem; }
/* ====================================
   Rail cards — Mode / Rule / Transport / Advanced (layout v2)
   ==================================== */

/* Mode card */
.mode-card select#mode-select {
    width: 100%;
    padding: 8px 10px;
    background: var(--bg-input);
    color: var(--text-main);
    border: 1px solid var(--border-fine);
    border-radius: 8px;
    font-size: 12px;
    margin: 0;
}
.mode-card select#mode-select:focus { outline: none; border-color: var(--accent-primary); }

.mode-card .mode-params {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding-top: 8px;
    margin-top: 0;
    border-top: 1px dashed var(--border-fine);
}
.mode-card .mode-params[hidden] { display: none; }

.mode-card .mode-param-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 8px;
}
.mode-card .mode-param-row label { color: var(--text-secondary); font-size: 11px; flex-shrink: 0; }
.mode-card .mode-mini-select,
.mode-card .mode-mini-input {
    flex: 1;
    padding: 5px 8px;
    background: var(--bg-input);
    color: var(--text-main);
    border: 1px solid var(--border-fine);
    border-radius: 6px;
    font-size: 11px;
    min-width: 0;
}
.mode-card .mode-mini-input { max-width: 90px; }
.mode-card .mode-hint {
    color: var(--text-muted);
    font-size: 11px;
    font-style: italic;
    line-height: 1.45;
    padding: 2px 0;
}
.mode-card .cyclic-status {
    color: var(--text-secondary);
    font-size: 11px;
    padding: 6px 8px;
    background: rgba(47, 212, 94, 0.08);
    border-radius: 6px;
}
.mode-card .cyclic-status strong { color: var(--accent-primary); }
.legend-dot {
    display: inline-block;
    width: 10px; height: 10px;
    border-radius: 50%;
    vertical-align: middle;
    margin: 0 2px;
}

/* Rule card */
.rule-card .rule-badge {
    background: rgba(47, 212, 94, 0.1);
    border: 1px solid rgba(47, 212, 94, 0.3);
    border-radius: 999px;
    padding: 6px 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 8px;
    margin: 0;
}
.rule-card .rule-badge strong { color: var(--accent-primary); font-size: 12px; font-weight: 600; }
.rule-card .rule-badge code {
    background: rgba(0, 0, 0, 0.3);
    padding: 2px 8px;
    border-radius: 6px;
    color: var(--text-secondary);
    font-family: 'Consolas', monospace;
    font-size: 10px;
}

.rule-card .toggle-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    font-size: 11px;
    color: var(--text-secondary);
    padding: 4px 0;
}
.rule-card .toggle-label { transition: color 0.2s; }
.rule-card .toggle-label.active { color: var(--text-main); font-weight: 600; }
.rule-card .toggle-switch {
    position: relative;
    display: inline-block;
    width: 30px;
    height: 16px;
}
.rule-card .toggle-switch input { opacity: 0; width: 0; height: 0; }
.rule-card .toggle-slider {
    position: absolute;
    inset: 0;
    background: var(--bg-input);
    border: 1px solid var(--border-fine);
    border-radius: 999px;
    cursor: pointer;
    transition: background 0.2s;
}
.rule-card .toggle-slider::before {
    content: '';
    position: absolute;
    width: 12px; height: 12px;
    top: 1px; left: 1px;
    background: var(--text-secondary);
    border-radius: 50%;
    transition: transform 0.2s, background 0.2s;
}
.rule-card .toggle-switch input:checked + .toggle-slider { background: rgba(47, 212, 94, 0.25); }
.rule-card .toggle-switch input:checked + .toggle-slider::before { transform: translateX(14px); background: var(--accent-primary); }

.rule-card .rule-dropdown { display: flex; flex-direction: column; gap: 6px; }
.rule-card .rule-dropdown label { color: var(--text-secondary); font-size: 11px; }
.rule-card .rule-dropdown select {
    padding: 6px 8px;
    background: var(--bg-input);
    color: var(--text-main);
    border: 1px solid var(--border-fine);
    border-radius: 6px;
    font-size: 12px;
    cursor: pointer;
}
.rule-card .rule-dropdown select:focus { outline: none; border-color: var(--accent-primary); }
.rule-card .rule-dropdown.disabled { opacity: 0.4; pointer-events: none; }

.rule-card .custom-rule-builder {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding-top: 6px;
    margin-top: 0;
    border-top: 1px dashed var(--border-fine);
}
.rule-card .custom-rule-builder[hidden] { display: none; }
.rule-card .rule-tag {
    background: rgba(47, 212, 94, 0.1);
    border: 1px solid rgba(47, 212, 94, 0.3);
    color: var(--accent-primary);
    font-size: 10px;
    padding: 4px 8px;
    border-radius: 999px;
    text-align: center;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.rule-card .rule-tag[hidden] { display: none; }
.rule-card .rule-group { display: flex; flex-direction: column; gap: 4px; }
.rule-card .rule-label {
    color: var(--accent-primary);
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}
.rule-card .checkbox-grid {
    display: grid;
    grid-template-columns: repeat(9, 1fr);
    gap: 3px;
}
.rule-card .checkbox-grid label {
    display: flex;
    align-items: center;
    justify-content: center;
    aspect-ratio: 1;
    background: var(--bg-input);
    border: 1px solid var(--border-fine);
    border-radius: 5px;
    font-size: 10px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: background 0.15s, color 0.15s, border-color 0.15s;
    position: relative;
    padding: 0;
}
.rule-card .checkbox-grid label:hover { background: var(--bg-surface-hover); }
.rule-card .checkbox-grid label input[type="checkbox"] {
    position: absolute;
    opacity: 0;
    inset: 0;
    width: 100%;
    height: 100%;
    margin: 0;
    cursor: pointer;
}
.rule-card .checkbox-grid label:has(input:checked) {
    background: rgba(47, 212, 94, 0.18);
    border-color: rgba(47, 212, 94, 0.5);
    color: var(--accent-primary);
    font-weight: 600;
}

/* Transport card */
.transport-card .control-buttons {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 6px;
    margin: 0;
}
.transport-card .btn {
    padding: 9px 12px;
    font-size: 12px;
}

/* Advanced accordion */
.acc-advanced { padding: 0; gap: 0; }
.acc-advanced > summary.acc-summary {
    list-style: none;
    cursor: pointer;
    padding: 14px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    color: var(--text-secondary);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.6px;
    text-transform: uppercase;
}
.acc-advanced > summary.acc-summary::-webkit-details-marker { display: none; }
.acc-advanced > summary.acc-summary::after {
    content: '▾';
    color: var(--text-muted);
    font-size: 12px;
    transition: transform 0.2s;
}
.acc-advanced[open] > summary.acc-summary::after { transform: rotate(180deg); }
.acc-advanced .acc-body {
    padding: 0 14px 14px 14px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.acc-advanced .control-slider { display: flex; flex-direction: column; gap: 4px; }
.acc-advanced .control-slider label {
    display: flex;
    justify-content: space-between;
    color: var(--text-secondary);
    font-size: 11px;
}
.acc-advanced .control-slider label strong {
    color: var(--text-main);
    font-variant-numeric: tabular-nums;
    font-weight: 600;
}
.acc-advanced .control-slider input[type="range"] {
    width: 100%;
    height: 4px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--bg-input);
    border-radius: 999px;
    outline: none;
    cursor: pointer;
}
.acc-advanced .control-slider input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 12px;
    height: 12px;
    background: var(--accent-primary);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 8px rgba(47, 212, 94, 0.4);
}
.acc-advanced .control-slider input[type="range"]::-moz-range-thumb {
    width: 12px;
    height: 12px;
    background: var(--accent-primary);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    box-shadow: 0 0 8px rgba(47, 212, 94, 0.4);
}
.acc-advanced .btn-full { width: 100%; }

/* Generic button tightening for v2 */
.rail .btn, .transport-card .btn, .acc-advanced .btn, .drawer .btn {
    padding: 9px 14px;
    border: none;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.15s, background 0.2s, box-shadow 0.2s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
    line-height: 1;
}
.rail .btn:hover { transform: translateY(-1px); }
.rail .btn .icon, .transport-card .btn .icon, .acc-advanced .btn .icon, .drawer .btn .icon { font-size: 12px; }
.rail .btn-sm, .drawer .btn-sm { padding: 5px 10px; font-size: 11px; }
.rail .btn-primary, .transport-card .btn-primary { background: var(--accent-primary); color: var(--text-on-accent); box-shadow: 0 3px 12px rgba(47, 212, 94, 0.25); }
.rail .btn-primary:hover, .transport-card .btn-primary:hover { background: var(--accent-hover); box-shadow: 0 5px 18px rgba(47, 212, 94, 0.4); }
.rail .btn-warning, .transport-card .btn-warning { background: rgba(245, 158, 11, 0.18); color: var(--warning); border: 1px solid rgba(245, 158, 11, 0.4); }
.rail .btn-secondary, .transport-card .btn-secondary, .acc-advanced .btn-secondary, .drawer .btn-secondary { background: rgba(255, 255, 255, 0.08); color: var(--text-main); }
.rail .btn-secondary:hover, .transport-card .btn-secondary:hover, .acc-advanced .btn-secondary:hover, .drawer .btn-secondary:hover { background: rgba(255, 255, 255, 0.14); }
.rail .btn-danger, .transport-card .btn-danger { background: rgba(239, 68, 68, 0.18); color: var(--danger); border: 1px solid rgba(239, 68, 68, 0.4); }
.rail .btn:disabled, .transport-card .btn:disabled { opacity: 0.45; cursor: not-allowed; transform: none; box-shadow: none; }


/* ====================================
   Drawer Motifs + Modal Help (layout v2)
   ==================================== */

.drawer-tab {
    position: absolute;
    right: 360px;
    top: 50%;
    transform: translateY(-50%);
    background: var(--bg-surface);
    border: 1px solid var(--border-fine);
    border-right: none;
    border-radius: 12px 0 0 12px;
    padding: 18px 6px;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    color: var(--text-secondary);
    font-size: 10px;
    letter-spacing: 0.7px;
    z-index: 5;
    transition: background 0.2s, color 0.2s, transform 0.2s;
}
.drawer-tab:hover {
    background: var(--bg-surface-hover);
    color: var(--text-main);
    transform: translateY(-50%) translateX(-3px);
}
.drawer-tab .dt-arrow { color: var(--accent-primary); font-size: 14px; }
.drawer-tab .dt-label {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    font-weight: 600;
    text-transform: uppercase;
}

.drawer {
    position: fixed;
    top: 10px;
    bottom: 198px;
    right: 10px;
    width: 360px;
    background: var(--bg-surface);
    border: 1px solid var(--border-fine);
    border-radius: 18px;
    padding: 14px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    z-index: 20;
    transform: translateX(calc(100% + 20px));
    transition: transform 0.25s ease-out;
    box-shadow: -8px 0 30px rgba(0, 0, 0, 0.3);
}
.drawer[hidden] { display: flex; }
.drawer.open { transform: translateX(0); }

.drawer-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-fine);
}
.drawer-body {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.drawer .pattern-tabs {
    display: flex;
    gap: 4px;
    flex-wrap: wrap;
}
.drawer .pattern-tabs button {
    padding: 4px 10px;
    background: var(--bg-input);
    color: var(--text-secondary);
    border: 1px solid var(--border-fine);
    border-radius: 999px;
    font-size: 11px;
    cursor: pointer;
    transition: background 0.15s, color 0.15s;
}
.drawer .pattern-tabs button:hover { background: var(--bg-surface-hover); }
.drawer .pattern-tabs button.active {
    background: var(--accent-primary);
    color: var(--text-on-accent);
    border-color: transparent;
}

.drawer .pattern-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 6px;
}
.drawer .pattern-list button {
    padding: 7px 10px;
    background: var(--bg-input);
    color: var(--text-main);
    border: 1px solid var(--border-fine);
    border-radius: 8px;
    font-size: 11px;
    cursor: pointer;
    text-align: left;
    transition: background 0.15s;
}
.drawer .pattern-list button:hover {
    background: var(--bg-surface-hover);
    border-color: var(--accent-primary);
}

.drawer .import-export-section {
    border-top: 1px solid var(--border-fine);
    padding-top: 10px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.drawer .panel-subtitle {
    color: var(--text-secondary);
    font-size: 11px;
    margin: 0;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.drawer .io-input textarea {
    width: 100%;
    padding: 8px;
    background: var(--bg-input);
    color: var(--text-main);
    border: 1px solid var(--border-fine);
    border-radius: 6px;
    font-family: 'Consolas', monospace;
    font-size: 11px;
    resize: vertical;
    min-height: 60px;
}
.drawer .io-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6px;
}

.backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.55);
    z-index: 15;
    opacity: 0;
    transition: opacity 0.2s;
    pointer-events: none;
}
.backdrop.open {
    opacity: 1;
    pointer-events: auto;
}

/* Modal Help */
.modal {
    position: fixed;
    inset: 0;
    z-index: 30;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.6);
    opacity: 0;
    transition: opacity 0.2s;
    pointer-events: none;
}
.modal[hidden] { display: flex; }
.modal.open {
    opacity: 1;
    pointer-events: auto;
}
.modal-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-fine);
    border-radius: 18px;
    padding: 20px 24px;
    min-width: 360px;
    max-width: 480px;
    display: flex;
    flex-direction: column;
    gap: 14px;
}
.modal-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-fine);
}
.modal .kbd-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 0;
    margin: 0;
}
.modal .kbd-list li {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-secondary);
    font-size: 12px;
}
.modal .kbd-list kbd {
    background: var(--bg-input);
    border: 1px solid var(--border-fine);
    border-bottom-width: 2px;
    padding: 3px 8px;
    border-radius: 5px;
    font-family: 'Consolas', monospace;
    font-size: 11px;
    color: var(--text-main);
    min-width: 60px;
    text-align: center;
}

/* Pattern hover preview popover */
.pattern-preview-popover {
    position: fixed;
    z-index: 25;
    background: var(--bg-surface);
    border: 1px solid var(--border-fine);
    border-radius: 10px;
    padding: 8px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.45);
    pointer-events: none;
    opacity: 0;
    transform: translateY(4px);
    transition: opacity 0.12s ease-out, transform 0.12s ease-out;
    display: flex;
    flex-direction: column;
    gap: 6px;
    min-width: 130px;
}
.pattern-preview-popover.visible {
    opacity: 1;
    transform: translateY(0);
}
.pattern-preview-popover canvas {
    background: #0a0f0c;
    border: 1px solid rgba(47, 212, 94, 0.18);
    border-radius: 4px;
    display: block;
    image-rendering: pixelated;
}
.pattern-preview-popover .pp-name {
    font-size: 11px;
    color: var(--text-main);
    font-weight: 600;
    letter-spacing: 0.3px;
}
.pattern-preview-popover .pp-meta {
    font-size: 10px;
    color: var(--text-muted);
}

/* ====================================
   Language Switcher
   ==================================== */

.lang-switcher { position: relative; }
.lang-current {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    height: 28px;
    padding: 0 10px;
    background: var(--bg-input);
    border: 1px solid var(--border-fine);
    border-radius: 999px;
    color: var(--text-secondary);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.4px;
    cursor: pointer;
    transition: background 0.2s, color 0.2s;
    font-family: inherit;
}
.lang-current:hover { background: var(--bg-surface-hover); color: var(--text-main); }
.lang-current .lang-flag { font-size: 14px; line-height: 1; }
.lang-current .lang-caret { color: var(--text-muted); font-size: 10px; }

.lang-menu {
    position: absolute;
    right: 0;
    top: calc(100% + 6px);
    min-width: 140px;
    list-style: none;
    margin: 0;
    padding: 4px;
    background: var(--bg-surface);
    border: 1px solid var(--border-fine);
    border-radius: 10px;
    box-shadow: 0 8px 22px rgba(0, 0, 0, 0.4);
    z-index: 40;
}
.lang-menu[hidden] { display: none; }
.lang-menu li {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 7px 10px;
    border-radius: 6px;
    font-size: 12px;
    color: var(--text-main);
    cursor: pointer;
    transition: background 0.15s;
}
.lang-menu li:hover { background: var(--bg-surface-hover); }
.lang-menu li.active { color: var(--accent); background: rgba(47, 212, 94, 0.08); }
.lang-menu li .lang-flag { font-size: 14px; line-height: 1; }
.lang-menu li .lang-name { flex: 1; }
.lang-menu li .lang-check { color: var(--accent); opacity: 0; }
.lang-menu li.active .lang-check { opacity: 1; }