/* ============================================================
   VARIABLES Y RESET GLOBAL
   ============================================================ */
:root {
    --primary: #10b981;
    --primary-dark: #059669;
    --secondary: #3b82f6;
    --secondary-dark: #2563eb;
    --danger: #ef4444;
    --warning: #f59e0b;
    --dark-bg: #0f172a;
    --dark-card: rgba(30, 41, 59, 0.8);
    --light-text: #e2e8f0;
    --gray-text: #94a3b8;
    --border-color: rgba(100, 116, 139, 0.3);
    --cell-alive: #10b981;
    --cell-born: #3b82f6;
    --cell-dying: #ef4444;
}

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

html, body {
    height: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
    color: var(--light-text);
    line-height: 1.6;
    touch-action: manipulation;
    overflow: hidden; /* Modo desktop: layout fijo al viewport */
}

/* Contenedor principal — grid de 3 filas: header / main / patrones */
.container {
    height: 100vh;
    display: grid;
    grid-template-rows: auto minmax(0, 1fr) auto;
    gap: 10px;
    padding: 10px 12px 8px;
}

/* ============================================================
   HEADER
   ============================================================ */
header {
    display: grid;
    grid-template-areas: "title title" "rules rules";
    grid-template-columns: 1fr auto;
    align-items: center;
    gap: 4px 10px;
    padding-bottom: 6px;
    border-bottom: 1px solid var(--border-color);
}

/* Botones solo visibles en móvil */
.mobile-menu-btn,
.rules-mobile-toggle {
    display: none;
}

h1 {
    grid-area: title;
    font-size: 1.22rem;
    color: white;
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 0;
}

h1 i {
    color: var(--primary);
}

.rules {
    grid-area: rules;
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 8px;
}

.rules-specific {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 6px 12px;
    overflow-x: auto;
    padding-bottom: 2px;
}

.rules-specific::-webkit-scrollbar {
    height: 4px;
}

.rules p {
    font-family: 'Courier New', monospace;
    font-size: 0.8rem;
    white-space: nowrap;
}

.birth {
    color: var(--primary);
    font-weight: 600;
}

.survival {
    color: var(--secondary);
    font-weight: 600;
}

.notation {
    color: var(--warning);
    font-size: 0.9rem;
}

.highlight {
    background: rgba(245, 158, 11, 0.2);
    padding: 1px 8px;
    border-radius: 4px;
    border: 1px solid var(--warning);
}

.header-meta-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-left: auto;
}

.neighborhood-info {
    font-size: 0.76rem;
    color: var(--gray-text);
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.05);
    padding: 4px 8px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    white-space: nowrap;
}

.neighborhood-info i {
    color: var(--secondary);
}

.header-quick-controls {
    display: flex;
    align-items: center;
    gap: 4px;
}

.header-quick-controls .coords {
    font-family: 'Courier New', monospace;
    font-size: 0.72rem;
    color: var(--gray-text);
    background: rgba(0, 0, 0, 0.3);
    padding: 4px 7px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    white-space: nowrap;
}

.header-quick-controls .btn-toggle {
    width: 28px;
    height: 28px;
    background: var(--dark-card);
    border: 1px solid var(--border-color);
    color: var(--light-text);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.header-quick-controls .btn-toggle:hover {
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-2px);
}

.header-quick-controls .btn-toggle.active {
    background: rgba(16, 185, 129, 0.2);
    border-color: var(--primary);
    color: var(--primary);
    box-shadow: 0 0 10px rgba(16, 185, 129, 0.3);
}

/* ============================================================
   LAYOUT PRINCIPAL
   ============================================================ */
.main-content {
    display: grid;
    grid-template-columns: minmax(270px, 300px) minmax(0, 1fr);
    gap: 14px;
    height: 100%;
    min-height: 0;
    align-items: stretch;
}

/* ============================================================
   PANEL IZQUIERDO — Configuración
   ============================================================ */
.left-panel {
    overflow-y: auto;
    padding-right: 8px;
    scrollbar-width: thin;
    scrollbar-color: var(--primary) transparent;
}

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

.left-panel::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.1);
    border-radius: 3px;
}

.left-panel::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 3px;
}

.left-panel::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

.config-section {
    background: var(--dark-card);
    backdrop-filter: blur(10px);
    border-radius: 12px;
    padding: 18px;
    border: 1px solid var(--border-color);
}

h3 {
    font-size: 1.3rem;
    margin-bottom: 20px;
    color: white;
    display: flex;
    align-items: center;
    gap: 10px;
}

h3 i {
    color: var(--primary);
}

.config-group {
    margin-bottom: 18px;
}

.config-group label {
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.value-display {
    padding: 2px 8px;
    font-size: 0.7rem;
}

/* Texto del span dentro de los toggle-label del sidebar */
.toggle-label span:not(.toggle-switch-slider) {
    font-size: 0.75rem;
}

/* Ocultar botón en desktop */
.mobile-panel-close {
    display: none;
}

/* ============================================================
   FORMULARIOS
   ============================================================ */
input[type="range"] {
    width: 100%;
    height: 6px;
    -webkit-appearance: none;
    background: linear-gradient(to right, var(--primary-dark), var(--primary));
    border-radius: 3px;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: white;
    cursor: pointer;
    border: 2px solid var(--primary);
}

.range-ticks {
    display: flex;
    justify-content: space-between;
    margin-top: 5px;
    font-size: 0.8rem;
    color: var(--gray-text);
}

select {
    width: 100%;
    padding: 10px 32px 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--light-text);
    font-size: 0.9rem;
    cursor: pointer;
    -webkit-appearance: none;
    appearance: none;
    background: rgba(255, 255, 255, 0.1) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%2310b981' stroke-width='1.8' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") no-repeat right 10px center;
}

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

select:focus {
    outline: none;
    border-color: var(--primary);
}

select {
    scrollbar-width: thin;
    scrollbar-color: var(--primary) transparent;
}

select::-webkit-scrollbar {
    width: 6px;
}

select::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.1);
    border-radius: 3px;
}

select::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 3px;
}

select::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

.limit-select, #ruleSelector, #neighborhoodType {
    background-color: var(--dark-card);
}

/* ============================================================
   PANEL CENTRAL
   ============================================================ */
.center-panel {
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    padding-right: 8px;
    gap: 8px;
    scrollbar-width: thin;
    scrollbar-color: var(--primary) transparent;
}

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

.center-panel::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.1);
    border-radius: 3px;
}

.center-panel::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 3px;
}

.center-panel::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

/* ============================================================
   ESTADÍSTICAS
   ============================================================ */
.stats {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
    flex-shrink: 0;
    position: sticky;
    top: 0;
    z-index: 10;
    background: inherit;
}

.stat-item {
    min-height: 0;
    padding: 3px 10px;
    background: var(--dark-card);
    backdrop-filter: blur(10px);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
}

.stat-label {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--gray-text);
    font-size: 0.75rem;
}

.stat-value {
    font-family: 'Courier New', monospace;
    font-size: 0.98rem;
    font-weight: 700;
    white-space: nowrap;
}

.generation {
    color: var(--primary);
}

.population {
    color: var(--secondary);
}

.density {
    color: var(--warning);
}

/* ============================================================
   OVERLAY DE RENDIMIENTO
   ============================================================ */
.perf-overlay {
    position: absolute;
    top: 100%;
    margin-top: 8px;
    z-index: 10;
    pointer-events: none;
    background: rgba(0, 0, 0, 0.65);
    backdrop-filter: blur(4px);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 6px;
    padding: 6px 10px;
    font-family: 'Courier New', monospace;
    font-size: 0.75rem;
    line-height: 1.7;
    color: var(--light-text);
    min-width: 140px;
}

.perf-overlay .perf-row {
    display: flex;
    justify-content: space-between;
    gap: 12px;
}

.perf-overlay .perf-label {
    color: var(--gray-text);
}

.perf-overlay .perf-value {
    color: var(--primary);
    font-weight: 700;
}

.perf-overlay .perf-value.warn {
    color: var(--warning);
}

.perf-overlay .perf-value.slow {
    color: var(--danger);
}

/* ============================================================
   CANVAS
   ============================================================ */
.canvas-wrapper {
    text-align: center;
    overflow: auto;
    flex: 1;
    min-height: 0;
    scrollbar-width: thin;
    white-space: nowrap;
    line-height: 0;
}

#canvas-container {
    display: inline-block;
    background: #000;
    border-radius: 15px;
    padding: 10px;
    text-align: left;
    white-space: normal;
    width: fit-content;
    position: relative;
}

canvas {
    display: block;
    cursor: crosshair;
    image-rendering: pixelated;
    background: #0f172a;
}

.canvas-overlay {
    position: absolute;
    top: 10px;
    left: 10px;
    pointer-events: none;
    z-index: 5;
}

/* ============================================================
   GRILLA
   ============================================================ */

/* ── Cabecera de tamaño ──────────────────────────────────────────────────── */
.grid-size-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 10px;
}

.grid-size-header label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    margin-bottom: 0;
}

/* ── Badge de dimensiones ────────────────────────────────────────────────── */
.grid-dimensions-badge {
    font-family: 'Courier New', monospace;
    font-size: 0.78rem;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 6px;
    background: rgba(16, 185, 129, 0.15);
    border: 1px solid rgba(16, 185, 129, 0.35);
    color: var(--primary);
    letter-spacing: 0.03em;
    transition: background 0.25s, border-color 0.25s;
    white-space: nowrap;
}

/* Cuando el grid es rectangular (no cuadrado) */
.grid-dimensions-badge.rect-badge {
    background: rgba(59, 130, 246, 0.15);
    border-color: rgba(59, 130, 246, 0.4);
    color: var(--secondary);
}

/* ── Presets rápidos ─────────────────────────────────────────────────────── */
.grid-presets {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
    margin-bottom: 12px;
}

.btn-grid-preset {
    flex: 1;
    min-width: 44px;
    padding: 5px 4px;
    font-size: 0.72rem;
    font-weight: 600;
    font-family: 'Courier New', monospace;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--gray-text);
    cursor: pointer;
    transition: background 0.18s, border-color 0.18s, color 0.18s, transform 0.15s;
    text-align: center;
}

.btn-grid-preset:hover {
    background: rgba(16, 185, 129, 0.12);
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-1px);
}

.btn-grid-preset:active {
    transform: translateY(0);
}

/* ── Filas de eje (ancho / alto) ─────────────────────────────────────────── */
.grid-axis-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 4px;
    margin-top: 10px;
}

.grid-axis-label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.82rem;
    color: var(--gray-text);
}

.grid-axis-label i {
    font-size: 0.75rem;
    color: var(--secondary);
    width: 14px;
    text-align: center;
}

/* ── Bloqueo de aspecto ──────────────────────────────────────────────────── */
.grid-aspect-lock-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    margin: 8px 0 2px;
    padding: 6px 10px;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    transition: background 0.2s, border-color 0.2s;
}

/* Estado activo del bloqueo */
.grid-aspect-lock-row:has(#gridAspectLock:checked) {
    background: rgba(245, 158, 11, 0.07);
    border-color: rgba(245, 158, 11, 0.35);
}

.grid-aspect-lock-label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-size: 0.82rem;
    color: var(--gray-text);
    user-select: none;
    margin-bottom: 0;
}

.grid-aspect-lock-label:hover {
    color: var(--light-text);
}

/* Ocultar el checkbox nativo */
.grid-aspect-lock-chk {
    display: none;
}

/* Icono del candado */
.grid-aspect-lock-icon {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 5px;
    background: rgba(255, 255, 255, 0.07);
    border: 1px solid var(--border-color);
    color: var(--gray-text);
    font-size: 0.75rem;
    transition: all 0.2s;
    flex-shrink: 0;
}

#gridAspectLock:checked ~ .grid-aspect-lock-icon,
.grid-aspect-lock-label:has(#gridAspectLock:checked) .grid-aspect-lock-icon {
    background: rgba(245, 158, 11, 0.18);
    border-color: rgba(245, 158, 11, 0.5);
    color: var(--warning);
    box-shadow: 0 0 6px rgba(245, 158, 11, 0.25);
}

/* Fallback para Firefox (no soporta :has en versiones antiguas) */
.grid-aspect-lock-icon.locked {
    background: rgba(245, 158, 11, 0.18);
    border-color: rgba(245, 158, 11, 0.5);
    color: var(--warning);
    box-shadow: 0 0 6px rgba(245, 158, 11, 0.25);
}

/* Display de ratio */
.grid-aspect-ratio-display {
    font-family: 'Courier New', monospace;
    font-size: 0.72rem;
    color: var(--gray-text);
    white-space: nowrap;
    min-width: 32px;
    text-align: right;
    transition: color 0.2s;
}

.grid-aspect-lock-row:has(#gridAspectLock:checked) .grid-aspect-ratio-display {
    color: var(--warning);
    font-weight: 700;
}

/* ============================================================
   BOTONES GENERALES
   ============================================================ */
.btn-toggle {
    background: var(--dark-card);
    border: 1px solid var(--border-color);
    color: var(--light-text);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.btn-toggle:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.btn-toggle.active {
    background: rgba(16, 185, 129, 0.2);
    border-color: var(--primary);
    color: var(--primary);
    box-shadow: 0 0 10px rgba(16, 185, 129, 0.3);
}

.controls {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
}

.btn-control {
    padding: 7px 10px;
    border: none;
    border-radius: 10px;
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    min-width: 92px;
    min-height: 36px;
}

.btn-control:hover {
    transform: translateY(-3px);
}

.btn-play {
    background: var(--primary);
    color: white;
}

.btn-play:hover {
    background: var(--primary-dark);
}

.btn-step {
    background: var(--secondary);
    color: white;
}

.btn-step:hover {
    background: var(--secondary-dark);
}

.btn-step-back {
    background: #6366f1;
    color: white;
}

.btn-step-back:hover {
    background: #4f46e5;
}

.btn-random {
    background: #8b5cf6;
    color: white;
}

.btn-random:hover {
    background: #7c3aed;
}

.btn-clear {
    background: var(--danger);
    color: white;
}

.btn-clear:hover {
    background: #dc2626;
}

.btn-cancel {
    background: var(--warning);
    color: white;
}

.btn-cancel:hover {
    background: #d97706;
}

.speed-buttons {
    display: flex;
    gap: 4px;
    background: var(--dark-card);
    border-radius: 12px;
    padding: 3px;
}

.btn-speed {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    border: none;
    background: rgba(255, 255, 255, 0.1);
    color: var(--light-text);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-speed:hover {
    background: var(--primary);
    color: white;
}

/* ============================================================
   CONTROL DE ALEATORIEDAD
   ============================================================ */
.random-control {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.random-percentage-control {
    margin-top: 6px;
}

.random-percentage-control .slider-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.random-percentage-control label {
    font-size: 0.85rem;
    color: var(--gray-text);
}

.random-percentage-control .value-display {
    background: var(--primary);
    color: white;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 600;
}

#randomPercentage {
    width: 100%;
    height: 6px;
    background: linear-gradient(to right, var(--primary-dark), var(--primary));
    border-radius: 3px;
    outline: none;
}

#randomPercentage::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: white;
    cursor: pointer;
    border: 2px solid var(--primary);
}

/* ============================================================
   BARRA DE PATRONES
   ============================================================ */
.patterns-horizontal-container {
    background: var(--dark-card);
    backdrop-filter: blur(10px);
    border-radius: 12px;
    padding: 5px 10px 10px;
    border: 1px solid var(--border-color);
    margin-top: 0;
}

.patterns-header {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    gap: 0;
    margin-bottom: 4px;
    padding-bottom: 4px;
    border-bottom: 1px solid var(--border-color);
    position: relative;
}

.patterns-header-left {
    display: flex;
    align-items: center;
    gap: 8px;
    min-width: 0;
    overflow: hidden;
    justify-content: flex-start;
    padding-right: 12px;
}

.patterns-header h3 {
    font-size: 0.94rem;
    margin: 0;
    white-space: nowrap;
    flex-shrink: 0;
}

.pattern-info-expanded {
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 1px;
    overflow: hidden;
    flex: 1;
}

.pattern-info-main {
    font-size: 0.74rem;
    color: var(--light-text);
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Contenedor combinado */
.pattern-info-combined {
    font-size: 0.66rem;
    color: var(--gray-text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    display: flex;
    align-items: center;
    gap: 6px;
}

.pattern-info-combined span {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.pattern-separator {
    color: var(--border-color);
    flex-shrink: 0;
}

.patterns-center-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0 auto;
    min-width: fit-content;
}

.patterns-center-controls .controls {
    gap: 6px;
    flex-wrap: nowrap;
    margin: 0;
}

.patterns-center-controls .btn-control {
    min-width: auto;
    min-height: 30px;
    padding: 6px 10px;
    font-size: 0.8rem;
    border-radius: 8px;
    gap: 6px;
    white-space: nowrap;
}

.patterns-center-controls .btn-control i {
    font-size: 0.9rem;
}

.patterns-center-controls .speed-buttons {
    gap: 4px;
}

.patterns-center-controls .btn-speed {
    width: 30px;
    height: 30px;
}

.patterns-controls {
    display: flex;
    gap: 4px;
    align-items: center;
    justify-content: flex-end;
    padding-left: 12px;
    min-width: 0;
}

.patterns-controls .btn-toggle {
    width: 28px;
    height: 28px;
    flex-shrink: 0;
}

.patterns-controls-divider {
    width: 1px;
    height: 12px;
    background: var(--border-color);
    margin: 0 2px;
    flex-shrink: 0;
}

#bucketToolBtn:not(.active) {
    border-color: var(--border-color);
    box-shadow: none;
    color: var(--light-text);
}

#bucketToolBtn.active {
    color: var(--warning);
    border-color: var(--warning);
    box-shadow: 0 0 6px rgba(245, 158, 11, 0.4);
}

.patterns-scroll-wrapper {
    overflow-x: auto;
    overflow-y: hidden;
    max-width: 100%;
}

.patterns-grid-container {
    display: flex;
    flex-wrap: nowrap;
    gap: 6px;
    padding: 4px 2px 2px;
    overflow-x: auto;
    overflow-y: hidden;
    max-height: 74px;
    scrollbar-width: thin;
    scrollbar-color: var(--primary) transparent;
}

.patterns-grid-container::-webkit-scrollbar {
    height: 6px;
}

.patterns-grid-container::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.1);
    border-radius: 3px;
}

.patterns-grid-container::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 3px;
}

.patterns-grid-container.two-rows {
    max-height: 160px;
    flex-wrap: wrap;
    overflow-y: auto;
    overflow-x: hidden;
}

.patterns-grid-container.compact-view {
    max-height: 66px;
}

/* ============================================================
   BOTONES DE PATRÓN
   ============================================================ */
.pattern-btn-horizontal {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    width: 60px;
    height: 60px;
    background: linear-gradient(145deg, rgba(30, 41, 59, 0.9), rgba(15, 23, 42, 0.95));
    border: 1px solid rgba(100, 116, 139, 0.2);
    border-radius: 10px;
    cursor: pointer;
    overflow: hidden;
    transition: all 0.2s ease;
    padding: 5px 4px;
}

.pattern-btn-horizontal:hover {
    border-color: var(--secondary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.pattern-btn-horizontal.active {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(16, 185, 129, 0.3);
}

.pattern-thumb-horizontal {
    width: 100%;
    height: 76px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #0a0f1a;
    border-bottom: 1px solid rgba(100, 116, 139, 0.15);
    position: relative;
    overflow: hidden;
}

.pattern-thumb-horizontal::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image: linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 4px 4px;
    pointer-events: none;
}

.pattern-canvas-horizontal {
    width: auto !important;
    height: auto !important;
    max-width: 24px;
    max-height: 24px;
    object-fit: contain;
    image-rendering: pixelated;
    display: block;
    position: relative;
    z-index: 1;
}

.pattern-label-horizontal {
    width: 100%;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.68rem;
    font-weight: 400;
    color: var(--gray-text);
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    padding: 0 6px;
    background: rgba(0, 0, 0, 0.15);
}

.pattern-size-badge {
    position: absolute;
    top: 4px;
    right: 4px;
    font-size: 0.55rem;
    font-weight: 600;
    background: rgba(16, 185, 129, 0.9);
    color: white;
    border-radius: 3px;
    padding: 1px 4px;
    z-index: 2;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

.pattern-btn-horizontal.compact {
    width: 50px;
    height: 50px;
    padding: 4px 3px;
}

.pattern-btn-horizontal.compact .pattern-canvas-horizontal {
    max-width: 22px;
    max-height: 22px;
}

/* ============================================================
   SCROLL BUTTONS (navegación horizontal de patrones)
   ============================================================ */
.scroll-buttons {
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    transform: translateY(-50%);
    display: flex;
    justify-content: space-between;
    pointer-events: none;
    z-index: 2;
}

.scroll-btn {
    pointer-events: all;
    width: 30px;
    height: 60px;
    background: rgba(30, 41, 59, 0.8);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--light-text);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.scroll-btn:hover {
    background: var(--dark-card);
    border-color: var(--primary);
    transform: scale(1.1);
}

/* ============================================================
   MODAL DE INSTRUCCIONES
   ============================================================ */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    z-index: 1000;
    backdrop-filter: blur(5px);
}

.modal-overlay.show {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: var(--dark-bg);
    border: 1px solid var(--primary);
    border-radius: 8px;
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    scrollbar-width: thin;
    scrollbar-color: var(--primary) transparent;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    border-bottom: 1px solid var(--primary);
    background: rgba(99, 102, 241, 0.1);
}

.modal-header h3 {
    margin: 0;
    color: var(--secondary);
}

.modal-close {
    background: none;
    border: none;
    color: var(--light-text);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 5px;
    border-radius: 4px;
    transition: background 0.2s;
}

.modal-close:hover {
    background: rgba(255, 255, 255, 0.1);
}

.modal-body {
    padding: 20px;
}

.modal-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 20px 18px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.modal-footer a {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--secondary);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.92rem;
}

.modal-footer a:hover {
    color: var(--primary);
}

.modal-content::-webkit-scrollbar {
    width: 6px;
}

.modal-content::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.1);
    border-radius: 3px;
}

.modal-content::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 3px;
}

.modal-content::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

/* ============================================================
   INSTRUCCIONES Y ATAJOS
   ============================================================ */
.instructions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 15px;
    margin: 20px 0;
}

.instruction-item {
    padding: 10px;
    background: rgba(99, 102, 241, 0.05);
    border-left: 3px solid var(--secondary);
    border-radius: 4px;
}

.instruction-item i {
    color: var(--secondary);
    margin-right: 8px;
    width: 16px;
}

.keyboard-shortcuts {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--primary);
}

.keyboard-shortcuts h4 {
    margin-bottom: 10px;
    color: var(--light-text);
}

.keyboard-shortcuts ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.keyboard-shortcuts li {
    padding: 5px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.keyboard-shortcuts li:last-child {
    border-bottom: none;
}

.keyboard-shortcuts strong {
    color: var(--secondary);
    font-family: monospace;
    background: rgba(0, 0, 0, 0.3);
    padding: 2px 6px;
    border-radius: 3px;
}

/* ============================================================
   ACORDEONES
   ============================================================ */
.accordion-group {
    margin-bottom: 8px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    background: rgba(255, 255, 255, 0.02);
}

.accordion-header {
    width: 100%;
    padding: 12px 15px;
    background: rgba(255, 255, 255, 0.05);
    border: none;
    color: var(--light-text);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    transition: all 0.2s ease;
}

.accordion-header:hover {
    background: rgba(255, 255, 255, 0.08);
}

.accordion-header i:first-child {
    color: var(--primary);
    width: 20px;
}

.accordion-icon {
    font-size: 0.8rem;
    color: var(--gray-text);
    transition: transform 0.3s ease;
}

.accordion-header.active .accordion-icon {
    transform: rotate(180deg);
}

.accordion-content {
    padding: 12px 15px;
    display: none;
}

.accordion-header.active + .accordion-content {
    display: block;
    animation: accordionSlide 0.3s ease;
}

@keyframes accordionSlide {
    from {
        opacity: 0;
        transform: translateY(-5px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.accordion-content .config-group {
    margin-bottom: 15px;
}

.accordion-content .config-group:last-child {
    margin-bottom: 0;
}

/* Sub-acordeón de motores especiales */
.accordion-group--engine {
    margin-bottom: 6px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 6px;
    overflow: hidden;
    background: rgba(255, 255, 255, 0.02);
}

.accordion-group--engine .accordion-header {
    padding: 9px 12px;
    font-size: 0.88rem;
    background: rgba(255, 255, 255, 0.04);
}

.accordion-group--engine .accordion-content {
    padding: 10px 12px;
}

/* ============================================================
   TOGGLE SWITCH
   ============================================================ */
.toggle-switch {
    display: flex;
    align-items: center;
}

.toggle-checkbox {
    display: none;
}

.toggle-label {
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--light-text);
    width: 100%;
    justify-content: space-between;
}

.toggle-switch-slider {
    position: relative;
    width: 48px;
    height: 24px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 24px;
    transition: background-color 0.3s ease;
    flex-shrink: 0;
}

.toggle-switch-slider::before {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background-color: var(--gray-text);
    top: 2px;
    left: 2px;
    transition: transform 0.3s ease, background-color 0.3s ease;
}

.toggle-checkbox:checked + .toggle-label .toggle-switch-slider {
    background-color: rgba(16, 185, 129, 0.3);
}

.toggle-checkbox:checked + .toggle-label .toggle-switch-slider::before {
    transform: translateX(24px);
    background-color: var(--primary);
}

/* ============================================================
   REGLA PERSONALIZADA
   ============================================================ */
.custom-rule-group {
    border: 1px solid var(--warning);
    border-radius: 8px;
    padding: 10px;
    background: rgba(245, 158, 11, 0.05);
    margin-top: 8px;
    margin-bottom: 14px;
}

.custom-rule-group label {
    display: block;
    margin-bottom: 3px;
    font-weight: 600;
    color: var(--warning);
}

.custom-rule-group input {
    width: 100%;
    padding: 6px 10px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--light-text);
    margin-bottom: 8px;
    font-family: 'Courier New', monospace;
}

/* ============================================================
   HEX RULE GROUP — clon de custom-rule-group con acento hex
   ============================================================ */
.hex-rule-group {
    border: 1px solid rgba(245, 158, 11, 0.35);
    border-radius: 8px;
    padding: 10px;
    background: rgba(245, 158, 11, 0.04);
    margin-bottom: 10px;
}

.hex-rule-group .config-group {
    margin-bottom: 10px;
}

.hex-rule-group .config-group:last-of-type {
    margin-bottom: 0;
}

.hex-rule-group label {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 4px;
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--warning);
}

.hex-rule-group input {
    width: 100%;
    box-sizing: border-box;
    padding: 6px 10px;
    background: rgba(255, 255, 255, 0.07);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--light-text);
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    letter-spacing: 0.08em;
}

.hex-rule-group input:focus {
    outline: none;
    border-color: var(--warning);
    background: rgba(245, 158, 11, 0.08);
}

.hex-rule-hint {
    font-size: 0.72rem;
    color: var(--gray-text);
    margin: 6px 0 0;
    line-height: 1.4;
}

#applyCustomRuleBtn {
    background: var(--warning);
    color: white;
    width: 100%;
}

#applyCustomRuleBtn:hover {
    background: #d97706;
}

#applyHexRuleBtn {
    background: var(--warning);
    color: white;
    width: 100%;
}

#applyHexRuleBtn:hover {
    background: #d97706;
}

/* ============================================================
   GRILLA DE VECINDAD PERSONALIZADA
   ============================================================ */
.neighborhood-grid {
    display: grid;
    gap: 3px;
    margin-top: 8px;
    width: fit-content;
    max-width: 100%;
}

.neighborhood-cell {
    width: var(--nc-size, 26px);
    height: var(--nc-size, 26px);
    border-radius: 4px;
    border: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.04);
    cursor: pointer;
    transition: background 0.15s ease, border-color 0.15s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.6rem;
    color: transparent;
    user-select: none;
}

.neighborhood-cell:hover:not(.center) {
    border-color: var(--secondary);
    background: rgba(59, 130, 246, 0.15);
}

.neighborhood-cell.active {
    background: rgba(16, 185, 129, 0.3);
    border-color: var(--primary);
    box-shadow: 0 0 6px rgba(16, 185, 129, 0.25);
}

.neighborhood-cell.center {
    background: rgba(100, 116, 139, 0.25);
    border-color: rgba(100, 116, 139, 0.5);
    cursor: default;
    color: var(--gray-text);
    font-size: 0.55rem;
}

.neighborhood-grid-hint {
    font-size: 0.75rem;
    color: var(--gray-text);
    margin-top: 6px;
}

/* ============================================================
   SELECTORES DE COLOR DE ACTIVIDAD
   ============================================================ */
.activity-colors {
    margin-top: 2px;
}

.activity-color-swatches {
    display: flex;
    gap: 5px;
    margin-top: 8px;
    flex-wrap: wrap;
}

.activity-swatch {
    width: 26px;
    height: 26px;
    border-radius: 4px;
    border: 2px solid rgba(255, 255, 255, 0.2);
    background-color: var(--swatch-color);
    cursor: pointer;
    position: relative;
    transition: border-color 0.15s ease, transform 0.15s ease;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.activity-swatch-label {
    font-size: 0.6rem;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.85);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.8);
    pointer-events: none;
    user-select: none;
    line-height: 1;
}

.activity-swatch:hover {
    border-color: var(--light-text);
    transform: scale(1.15);
}

.activity-swatch input[type="color"] {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
    padding: 0;
    border: none;
}

/* ============================================================
   MODOS ESPECIALES — controles
   ============================================================ */
.wolfram-controls, .triangle-controls {
    transition: opacity 0.3s ease;
    opacity: 0.5;
    pointer-events: none;
}

.wolfram-controls.active, .triangle-controls.active {
    opacity: 1;
    pointer-events: all;
}

.wolfram-presets, .triangle-presets {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin-top: 10px;
}

/* Presets con 5 botones: 2 columnas, el último centrado */
.hex-controls .triangle-presets {
    grid-template-columns: 1fr 1fr;
}

.btn-preset {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    color: var(--light-text);
    padding: 6px 8px;
    border-radius: 6px;
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-preset:hover {
    background: var(--primary);
    border-color: var(--primary);
}

/* Etiquetas de header para cada modo */
.wolfram-rule {
    color: #8b5cf6;
    font-weight: 600;
}

.wolfram-binary {
    color: #10b981;
    font-weight: 600;
    font-family: 'Courier New', monospace;
}

.wolfram-direction {
    color: #3b82f6;
    font-weight: 600;
}

.rd2d-states {
    color: #ec4899;
    font-weight: 600;
}

.rd2d-rule {
    color: #8b5cf6;
    font-weight: 600;
}

.rd2d-alive {
    color: #f59e0b;
    font-weight: 600;
}

.triangle-rule {
    color: #ec4899;
    font-weight: 600;
}

.langton-rule {
    color: #0666d4;
    font-weight: 600;
}

.langton-colors {
    color: #10b981;
    font-weight: 600;
}

.langton-ants {
    color: #b9b610;
    font-weight: 600;
}

/* ============================================================
   INDICADOR DE MODO (esquina inferior derecha)
   ============================================================ */
.mode-indicator {
    position: fixed;
    bottom: 20px;
    right: 20px;
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 600;
    z-index: 100;
    display: flex;
    align-items: center;
    gap: 8px;
}

.mode-indicator.standard-mode {
    background: rgba(16, 185, 129, 0.2);
    border: 1px solid var(--primary);
    color: var(--primary);
}

.mode-indicator.wolfram-mode {
    background: rgba(139, 92, 246, 0.2);
    border: 1px solid #8b5cf6;
    color: #8b5cf6;
}

.mode-indicator.rd2d-mode {
    background: rgba(236, 72, 153, 0.2);
    border: 1px solid #ec4899;
    color: #ec4899;
}

.mode-indicator.triangle-mode {
    background: rgba(236, 72, 153, 0.2);
    border: 1px solid #ec4899;
    color: #ec4899;
}

.mode-indicator.wireworld-mode {
    background: rgba(234, 179, 8, 0.15);
    border: 1px solid #eab308;
    color: #eab308;
}

.mode-indicator.generations-mode {
    background: rgba(99, 102, 241, 0.15);
    border: 1px solid #6366f1;
    color: #6366f1;
}

.mode-indicator.langton-mode {
    background: rgba(6, 102, 212, 0.15);
    border: 1px solid #0666d4;
    color: #0666d4;
}

.mode-indicator.uw-mode {
    background: rgba(59, 130, 246, 0.15);
    border: 1px solid var(--secondary);
    color: var(--secondary);
}

/* ============================================================
   EFECTOS VARIOS
   ============================================================ */
.limit-reached {
    animation: pulse-limit 0.5s ease-in-out 3;
    color: var(--danger) !important;
}

@keyframes pulse-limit {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.1);
    }
}

/* Indicador de modo de dibujo (patrón seleccionado) */
.pattern-mode-indicator {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 6px;
    font-size: 0.78rem;
    font-weight: 600;
}

.pattern-mode-indicator.free-draw {
    background: rgba(16, 185, 129, 0.15);
    border: 1px solid var(--primary);
    color: var(--primary);
}

.pattern-mode-indicator.pattern-selected {
    background: rgba(59, 130, 246, 0.15);
    border: 1px solid var(--secondary);
    color: var(--secondary);
}

/* ============================================================
   SELECCIÓN Y ARRASTRE
   ============================================================ */
.selection-overlay {
    position: absolute;
    border: 2px dashed #3b82f6;
    background-color: rgba(59, 130, 246, 0.1);
    pointer-events: none;
    z-index: 4;
}

.drag-preview {
    position: absolute;
    border: 2px solid #3b82f6;
    background-color: rgba(59, 130, 246, 0.15);
    pointer-events: none;
    z-index: 5;
    overflow: hidden;
}

.drag-preview canvas {
    width: 100%;
    height: 100%;
    opacity: 0.7;
}

.selection-info {
    background: var(--dark-card);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 8px 12px;
    margin-top: 10px;
    font-size: 0.9rem;
    display: none;
}

.selection-info-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}

.btn-small {
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--light-text);
    cursor: pointer;
    padding: 4px 8px;
    font-size: 0.8rem;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.btn-small:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--primary);
}

.btn-small.delete {
    color: #ef4444;
    border-color: #ef4444;
}

.btn-small.delete:hover {
    background: rgba(239, 68, 68, 0.1);
}

/* ============================================================
   ╔══════════════════════════════════════════════════════════╗
   ║  RESPONSIVE — MÓVIL (≤ 768px)                           ║
   ╚══════════════════════════════════════════════════════════╝
   ============================================================ */
@media (max-width: 768px) {

    /* ----------------------------------------------------------
       Habilitar scroll vertical.
       El layout desktop usa overflow:hidden + height:100vh para
       fijar la app al viewport. En móvil necesitamos scroll libre.
    ---------------------------------------------------------- */
    html, body {
        height: auto;
        min-height: 100%;
    }

    body {
        overflow-y: auto;
        overflow-x: hidden;
    }

    /* Excepción: bloquear scroll del fondo cuando el drawer está abierto */
    body.panel-open {
        overflow: hidden;
    }

    /* Container: crece con el contenido en lugar de quedar fijo al vh */
    .container {
        height: auto;
        min-height: 100svh; /* svh evita saltos por la barra de URL del browser */
        grid-template-rows: auto auto auto auto;
        padding: 8px;
        gap: 8px;
        overflow: visible;
    }

    /* ----------------------------------------------------------
       HEADER
    ---------------------------------------------------------- */
    header {
        grid-template-areas: "title menu-btn rules-mobile-toggle"
                         "rules rules rules";
        grid-template-columns: 1fr auto auto;
        gap: 8px;
        padding-bottom: 4px;
    }

    h1 {
        font-size: 1rem;
        gap: 6px;
    }

    h1 i {
        font-size: 0.9rem;
    }

    /* Mostrar botones de menú y reglas */
    .mobile-menu-btn,
    .rules-mobile-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 40px;
        height: 40px;
        min-height: 40px; /* touch target */
        background: var(--dark-card);
        border: 1px solid var(--border-color);
        border-radius: 8px;
        color: var(--light-text);
        cursor: pointer;
        transition: all 0.3s ease;
    }

    .mobile-menu-btn:hover,
    .rules-mobile-toggle:hover {
        border-color: var(--primary);
        color: var(--primary);
    }

    .mobile-menu-btn {
        grid-area: menu-btn;
        display: flex;
    }

    .rules-mobile-toggle {
        grid-area: rules-mobile-toggle;
        display: flex;
    }

    .rules-mobile-toggle i {
        color: var(--secondary);
        font-size: 1.1rem;
    }

    /* Panel de reglas: cae desde arriba como dropdown */
    .rules {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        background: var(--dark-card);
        backdrop-filter: blur(10px);
        border: none;
        border-bottom: 1px solid var(--border-color);
        border-radius: 0 0 14px 14px;
        padding: 52px 14px 14px; /* padding-top cubre el header visible debajo */
        z-index: 110;
        display: none;
        flex-direction: column;
        gap: 10px;
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
        max-height: 85vh;
        overflow-y: auto;
    }

    .rules.show {
        display: flex;
        animation: slideDown 0.3s ease;
    }

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

    /* ----------------------------------------------------------
       LAYOUT PRINCIPAL: una sola columna
    ---------------------------------------------------------- */
    .main-content {
        grid-template-columns: 1fr;
        height: auto;
        gap: 10px;
        position: relative;
    }

    /* ----------------------------------------------------------
       Panel izquierdo como drawer lateral.
       Usa transform para la animación (GPU-accelerated) y
       position:fixed para que no afecte el flujo normal del documento.
    ---------------------------------------------------------- */
    .left-panel {
        position: fixed;
        top: 0;
        left: 0;
        width: 85%;
        max-width: 320px;
        height: 100dvh; /* dvh: descuenta barra de browser en iOS/Android */
        background: var(--dark-bg);
        backdrop-filter: blur(20px);
        z-index: 200;
        padding: 60px 20px 20px;
        border-right: 1px solid var(--border-color);
        box-shadow: 5px 0 30px rgba(0, 0, 0, 0.5);
        transition: transform 0.3s ease;
        overflow-y: auto;
    }

    .left-panel.mobile-hidden {
        transform: translateX(-100%);
        pointer-events: none;
    }

    .left-panel.mobile-visible {
        transform: translateX(0);
        pointer-events: all;
    }

    /* Overlay oscuro al abrir el drawer */
    body.panel-open::before {
        content: '';
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.6);
        z-index: 150;
        backdrop-filter: blur(2px);
    }

    /* Botón cerrar panel */
    .mobile-panel-close {
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        width: 100%;
        padding: 14px;
        margin-top: 20px;
        background: var(--danger);
        color: white;
        border: none;
        border-radius: 8px;
        font-size: 0.9rem;
        font-weight: 600;
        cursor: pointer;
        min-height: 48px; /* touch target mínimo recomendado */
        transition: all 0.3s ease;
    }

    .mobile-panel-close:hover {
        background: #dc2626;
    }

    /* Config section en el drawer */
    .config-section {
        padding: 15px;
    }

    h3 {
        font-size: 1.1rem;
        margin-bottom: 15px;
    }

    .accordion-header {
        padding: 12px 14px;
        font-size: 0.9rem;
        min-height: 44px;
    }

    .accordion-content {
        padding: 10px 12px;
    }

    /* ----------------------------------------------------------
       ESTADÍSTICAS
    ---------------------------------------------------------- */
    .stats {
        grid-template-columns: repeat(3, 1fr);
        gap: 6px;
    }

    .stat-item {
        padding: 8px 6px;
        flex-direction: row;
        gap: 6px;
    }

    .stat-label {
        font-size: 0.68rem;
        gap: 4px;
    }

    .stat-value {
        font-size: 0.9rem;
    }

    /* ----------------------------------------------------------
       Canvas con scroll horizontal.
       El grid puede ser 1000px+ de ancho en pantallas de 375px.
       Permite deslizar el canvas sin romper el layout vertical.
    ---------------------------------------------------------- */
    /* Canvas wrapper ajustable */
    .canvas-wrapper {
        overflow: auto;
        flex: 1;
        min-height: 0;
        scrollbar-width: thin;
        white-space: nowrap;
        line-height: 0;
        padding-bottom: 6px;
    }

    #canvas-container {
        display: inline-block;
        background: #000;
        border-radius: 15px;
        text-align: left;
        white-space: normal;
        width: auto;
        max-width: none;
        position: relative;
    }

    canvas {
        display: block;
        width: auto;
        height: auto;
    }

    /* ----------------------------------------------------------
       Controles en grid de 3 columnas.
       El flex-wrap original genera filas de ancho inconsistente.
       Un grid garantiza alineación y tamaños uniformes.
    ---------------------------------------------------------- */
    .patterns-center-controls .controls {
        display: flex;
        grid-template-rows: auto auto;
        gap: 7px;
        padding: 0;
        flex-wrap: unset; /* cancelar flex-wrap heredado */
    }

    .patterns-center-controls .controls .btn-control {
        min-height: 44px; /* touch target recomendado por WCAG */
        min-width: 0;
        width: 100%;
        font-size: 0.8rem;
        padding: 8px 4px;
        border-radius: 8px;
        flex-direction: column;
        gap: 3px;
        white-space: nowrap;
    }

    .patterns-center-controls .controls .btn-control i {
        font-size: 1rem;
    }

    /* Botones de velocidad abarcan toda la fila inferior */
    .patterns-center-controls .controls .speed-buttons {
        grid-column: 1 / -1;
        justify-content: center;
        background: transparent;
        padding: 0;
    }

    /* ----------------------------------------------------------
       Cabecera de patrones.
       Grid de 2 columnas × 2 filas bien definido.
    ---------------------------------------------------------- */
    .patterns-horizontal-container {
        padding: 8px;
        margin-top: 0;
    }

    .patterns-header {
        display: grid;
        grid-template-columns: 1fr auto;
        grid-template-rows: auto auto;
        gap: 8px;
        align-items: center;
    }

    .patterns-header-left {
        grid-column: 1;
        grid-row: 1;
        gap: 6px;
    }

    .patterns-header h3 {
        font-size: 0.9rem;
        margin-bottom: 0;
    }

    /* Info extendida del patrón: oculta en móvil (ocupa espacio innecesario) */
    .pattern-info-expanded {
        display: none;
    }

    /* Botones de toggle: columna derecha, fila 1 */
    .patterns-controls {
        grid-column: 2;
        grid-row: 1;
        position: static; /* cancelar cualquier herencia de absolute */
        flex-wrap: nowrap;
        gap: 4px;
    }

    .patterns-controls .btn-toggle {
        width: 32px;
        height: 32px;
        min-height: 32px;
    }

    .patterns-controls-divider {
        height: 10px;
    }

    /* Controles de play: fila 2, ancho completo */
    .patterns-center-controls {
        grid-column: 1 / -1;
        grid-row: 2;
        order: unset; /* cancelar order:2 del desktop */
    }

    /* Contenedor de scroll de patrones */
    .patterns-grid-container {
        max-height: 74px;
        gap: 5px;
    }

    .patterns-grid-container.two-rows {
        max-height: 152px;
        flex-wrap: wrap;
        overflow-y: auto;
        overflow-x: hidden;
    }

    .patterns-grid-container.compact-view {
        max-height: 64px;
    }

    /* Tamaño de botones de patrón en móvil */
    .pattern-btn-horizontal {
        width: 52px;
        height: 52px;
        padding: 4px 3px;
        flex-shrink: 0;
    }

    .pattern-btn-horizontal.compact {
        width: 46px;
        height: 46px;
    }

    .pattern-thumb-horizontal {
        height: 30px;
    }

    .pattern-canvas-horizontal {
        max-width: 22px;
        max-height: 22px;
    }

    .pattern-label-horizontal {
        height: 18px;
        font-size: 0.62rem;
    }

    .pattern-size-badge {
        font-size: 0.5rem;
        padding: 1px 3px;
        top: 2px;
        right: 2px;
    }

    /* ----------------------------------------------------------
       MISCELÁNEA
    ---------------------------------------------------------- */
    .random-percentage-control .slider-header {
        margin-bottom: 6px;
    }

    .random-percentage-control label {
        font-size: 0.8rem;
    }

    .neighborhood-cell {
        --nc-size: 22px;
    }

    .modal-content {
        width: 95%;
        max-height: 85vh;
        margin: 10px;
    }

    .instructions-grid {
        grid-template-columns: 1fr;
        gap: 10px;
    }

    .keyboard-shortcuts ul {
        font-size: 0.85rem;
    }

    .perf-overlay {
        font-size: 0.65rem;
        padding: 4px 8px;
        min-width: 120px;
        position: absolute;
        top: 100%;
    }

    .mode-indicator {
        bottom: 10px;
        right: 10px;
        padding: 6px 12px;
        font-size: 0.75rem;
    }

    .grid-presets {
        gap: 4px;
    }

    .btn-grid-preset {
        font-size: 0.68rem;
        padding: 6px 3px;
        min-height: 36px;
    }

    .grid-aspect-lock-row {
        padding: 7px 8px;
    }

    .grid-aspect-lock-label {
        font-size: 0.78rem;
    }
}

/* ============================================================
   RESPONSIVE — EXTRA PEQUEÑO (≤ 480px)
   ============================================================ */
@media (max-width: 480px) {
    .container {
        padding: 6px;
        gap: 6px;
    }

    header {
        gap: 6px;
    }

    h1 {
        font-size: 0.9rem;
    }

    /* Solo iconos: los textos de los botones se ocultan */
    .patterns-center-controls .controls .btn-control span {
        display: none;
    }

    .patterns-center-controls .controls .btn-control {
        padding: 10px 6px;
        min-height: 44px;
    }

    .patterns-grid-container {
        max-height: 62px;
    }

    .patterns-grid-container.two-rows {
        max-height: 130px;
    }

    .pattern-btn-horizontal {
        width: 46px;
        height: 46px;
    }

    .stat-item {
        padding: 6px 4px;
    }

    .stat-label {
        font-size: 0.62rem;
    }

    .stat-value {
        font-size: 0.82rem;
    }
}

/* ============================================================
   RESPONSIVE — LANDSCAPE EN MÓVIL
   ============================================================ */
@media (max-width: 768px) and (orientation: landscape) {
    .left-panel {
        width: 60%;
        max-width: 400px;
    }

    .patterns-grid-container {
        max-height: 56px;
    }

    .patterns-grid-container.two-rows {
        max-height: 112px;
    }
}

/* ============================================================
   DESKTOP OVERRIDE (≥ 769px)
   Garantiza que los estilos mobile nunca "contaminen" el desktop.
   Usa !important para anular transformaciones/posicionamientos
   que el JS puede haber aplicado antes de detectar el breakpoint.
   ============================================================ */
@media (min-width: 769px) {

    /* Restaurar el panel izquierdo a su estado inline */
    .left-panel {
        transform: none !important;
        position: relative !important;
        width: auto !important;
        height: auto !important;
        z-index: auto !important;
        border-right: none !important;
        box-shadow: none !important;
        padding: 0 8px 0 0 !important;
        background: transparent !important;
        backdrop-filter: none !important;
    }

    .left-panel.mobile-hidden,
    .left-panel.mobile-visible {
        transform: none !important;
        pointer-events: all !important;
    }

    /* Ocultar elementos exclusivamente móviles */
    .mobile-menu-btn,
    .rules-mobile-toggle,
    .mobile-panel-close {
        display: none !important;
    }

    /* Eliminar overlay de panel abierto */
    body.panel-open::before {
        display: none !important;
    }

    /* Restaurar el panel de reglas a su posición inline en el header */
    .rules {
        position: relative !important;
        top: auto !important;
        left: auto !important;
        right: auto !important;
        display: flex !important;
        background: transparent !important;
        border: none !important;
        box-shadow: none !important;
        padding: 0 !important;
        max-height: none !important;
        z-index: auto !important;
    }
}