/**
 * ============================================================
 * TABLES MASTER - Estilos CSS3
 * ============================================================
 * 
 * Diseño moderno y colorido para niños de 6-12 años
 * Incluye animaciones suaves, diseño responsive y accesibilidad
 * 
 * Autor: Mavis (MiniMax Code)
 * Versión: 1.0.0
 * 
 * ============================================================
 */

/* ============================================================
   VARIABLES CSS (CUSTOM PROPERTIES)
   ============================================================ */
:root {
    /* Colores primarios - Paleta vibrante para niños */
    --color-primary: #FF6B6B;           /* Rojo coral */
    --color-primary-dark: #EE5A5A;
    --color-primary-light: #FF8A8A;
    
    --color-secondary: #4ECDC4;         /* Turquesa */
    --color-secondary-dark: #3DBDB5;
    --color-secondary-light: #6FE7DF;
    
    --color-accent: #FFE66D;           /* Amarillo brillante */
    --color-accent-dark: #FFD93D;
    
    --color-success: #6BCB77;          /* Verde */
    --color-success-dark: #5AB868;
    
    --color-danger: #FF6B6B;           /* Rojo */
    --color-danger-dark: #EE5A5A;
    
    --color-warning: #FFA94D;          /* Naranja */
    
    /* Colores del arcoíris para las tablas */
    --table-1: #FF6B6B;    /* Rojo */
    --table-2: #FFA94D;    /* Naranja */
    --table-3: #FFE66D;    /* Amarillo */
    --table-4: #6BCB77;    /* Verde */
    --table-5: #4ECDC4;    /* Turquesa */
    --table-6: #45B7D1;    /* Azul claro */
    --table-7: #6C5CE7;    /* Púrpura */
    --table-8: #A29BFE;    /* Lavanda */
    --table-9: #FD79A8;    /* Rosa */
    --table-10: #74B9FF;   /* Azul */
    
    /* Colores de fondo */
    --bg-primary: #F8F9FA;
    --bg-secondary: #FFFFFF;
    --bg-gradient-1: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --bg-gradient-2: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --bg-gradient-3: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --bg-gradient-success: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    --bg-gradient-danger: linear-gradient(135deg, #eb3349 0%, #f45c43 100%);
    
    /* Colores de texto */
    --text-primary: #2D3436;
    --text-secondary: #636E72;
    --text-light: #B2BEC3;
    --text-white: #FFFFFF;
    
    /* Espaciado */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;
    
    /* Bordes redondeados */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 30px;
    --radius-full: 50%;
    
    /* Sombras */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.2);
    --shadow-glow: 0 0 20px rgba(255, 107, 107, 0.5);
    --shadow-glow-success: 0 0 20px rgba(107, 203, 119, 0.5);
    --shadow-glow-gold: 0 0 30px rgba(255, 230, 109, 0.6);
    
    /* Transiciones */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Tamaños de fuente */
    --font-xs: 0.75rem;
    --font-sm: 0.875rem;
    --font-md: 1rem;
    --font-lg: 1.25rem;
    --font-xl: 1.5rem;
    --font-xxl: 2rem;
    --font-hero: 3rem;
    
    /* Z-index para capas */
    --z-base: 1;
    --z-dropdown: 100;
    --z-modal: 1000;
    --z-overlay: 2000;
    --z-notification: 3000;
}

/* ============================================================
   PANTALLA DE USUARIOS
   ============================================================ */
.users-welcome {
    text-align: center;
    margin: var(--spacing-lg) 0 var(--spacing-xl);
}

.users-title {
    font-size: var(--font-xl);
    color: var(--text-primary);
    font-weight: 700;
}

.users-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

@media (min-width: 480px) {
    .users-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.user-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
    border: 3px solid transparent;
    position: relative;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.user-card:hover, .user-card:active {
    transform: translateY(-4px) scale(1.02);
    box-shadow: var(--shadow-md);
}

.user-card.current {
    border-color: var(--color-success);
    box-shadow: 0 0 0 3px rgba(107, 203, 119, 0.3), var(--shadow-md);
}

.user-card.current::before {
    content: '⭐';
    position: absolute;
    top: -8px;
    right: -8px;
    font-size: 1.5rem;
    background: white;
    border-radius: 50%;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-sm);
}

.user-card-avatar {
    font-size: 3rem;
    display: block;
    margin-bottom: var(--spacing-sm);
    line-height: 1;
}

.user-card-name {
    font-weight: 700;
    font-size: var(--font-md);
    color: var(--text-primary);
    margin-bottom: 2px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.user-card-stats {
    font-size: var(--font-xs);
    color: var(--text-secondary);
    line-height: 1.2;
}

.user-card-delete {
    position: absolute;
    bottom: 4px;
    right: 4px;
    background: transparent;
    border: none;
    color: var(--text-light);
    font-size: 0.85rem;
    cursor: pointer;
    padding: 4px 6px;
    border-radius: 50%;
    transition: all 0.2s ease;
    opacity: 0.6;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.user-card-delete:hover, .user-card-delete:active {
    opacity: 1;
    background: rgba(255, 107, 107, 0.1);
    color: var(--color-danger);
}

.add-user-btn {
    width: 100%;
    margin-top: var(--spacing-md);
}

/* ============================================================
   HEADER DE USUARIO EN HOME
   ============================================================ */
.home-user-header {
    padding: var(--spacing-md) 0 0;
    margin-bottom: -8px;
    display: flex;
    justify-content: flex-start;
}

.home-header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    gap: var(--spacing-md);
}

.btn-back-user {
    background: transparent;
    border: none;
    padding: 0;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    flex: 1;
    text-align: left;
}

.btn-language-toggle {
    display: flex;
    align-items: center;
    gap: 4px;
    background: var(--bg-secondary);
    border: 2px solid var(--bg-primary);
    color: var(--text-primary);
    padding: 8px 12px;
    border-radius: 50px;
    font-weight: 700;
    font-size: var(--font-sm);
    cursor: pointer;
    transition: all var(--transition-normal);
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    box-shadow: var(--shadow-sm);
    flex-shrink: 0;
    min-width: 60px;
    min-height: 44px;
    justify-content: center;
}

.btn-language-toggle:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
}

.btn-language-toggle:active {
    transform: scale(0.95);
}

.btn-language-toggle .lang-icon {
    font-size: 1.1rem;
}

.btn-language-toggle .lang-code {
    font-size: 0.85rem;
    letter-spacing: 0.5px;
}

.user-badge {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: var(--bg-secondary);
    padding: 8px 14px;
    border-radius: 50px;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    border: 2px solid transparent;
    max-width: fit-content;
}

.btn-back-user:hover .user-badge,
.btn-back-user:active .user-badge {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.user-avatar {
    font-size: 1.75rem;
    line-height: 1;
}

.user-info {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    line-height: 1.1;
}

.user-name {
    font-weight: 800;
    color: var(--text-primary);
    font-size: var(--font-md);
    max-width: 120px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.user-level {
    font-size: var(--font-xs);
    color: var(--text-secondary);
    font-weight: 600;
}

.user-switch-icon {
    color: var(--text-light);
    font-size: 1.2rem;
    margin-left: 2px;
}

/* ============================================================
   MODAL: CREAR USUARIO
   ============================================================ */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
    padding: var(--spacing-md);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    overflow-y: auto;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    transform: scale(0.8) translateY(20px);
    transition: transform var(--transition-normal);
    box-shadow: var(--shadow-lg);
    margin: auto;
}

.modal-overlay.active .modal-content {
    transform: scale(1) translateY(0);
}

.modal-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: transparent;
    border: none;
    color: var(--text-light);
    font-size: 1.25rem;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.modal-close:hover, .modal-close:active {
    background: var(--bg-primary);
    color: var(--text-primary);
}

.modal-title {
    font-size: var(--font-xl);
    font-weight: 800;
    margin-bottom: var(--spacing-lg);
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.modal-title .emoji {
    animation: none;
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    font-size: var(--font-md);
}

.form-label .emoji {
    animation: none;
}

.form-input {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    border: 3px solid var(--bg-primary);
    border-radius: var(--radius-md);
    font-size: var(--font-lg);
    font-family: inherit;
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: all var(--transition-normal);
    -webkit-tap-highlight-color: transparent;
    transform: translateZ(0);
}

.form-input:focus {
    outline: none;
    border-color: var(--color-primary);
    background: var(--bg-secondary);
    box-shadow: 0 0 0 4px rgba(255, 107, 107, 0.1);
}

.avatar-grid {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    gap: 6px;
    max-height: 220px;
    overflow-y: auto;
    padding: 4px;
}

.avatar-option {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    background: var(--bg-primary);
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    line-height: 1;
}

.avatar-option:hover {
    transform: scale(1.1);
}

.avatar-option.selected {
    border-color: var(--color-primary);
    background: var(--bg-secondary);
    transform: scale(1.1);
    box-shadow: var(--shadow-sm);
}

@media (max-width: 480px) {
    .avatar-grid {
        grid-template-columns: repeat(6, 1fr);
    }
}

.color-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: var(--spacing-sm);
}

.color-option {
    aspect-ratio: 1;
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 3px solid transparent;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.color-option:hover {
    transform: scale(1.15);
}

.color-option.selected {
    border-color: var(--text-primary);
    transform: scale(1.15);
    box-shadow: 0 0 0 3px var(--bg-secondary), 0 0 0 5px currentColor;
}

.modal-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-end;
    margin-top: var(--spacing-xl);
}

.modal-buttons .btn {
    flex: 1;
    min-width: 100px;
}

/* ============================================================
   PANTALLA DE RANKING
   ============================================================ */
.podium {
    display: flex;
    justify-content: center;
    align-items: flex-end;
    gap: var(--spacing-sm);
    margin: var(--spacing-xl) 0;
    min-height: 180px;
}

.podium-place {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex: 1;
    max-width: 110px;
    -webkit-tap-highlight-color: transparent;
    transition: transform 0.3s ease;
}

.podium-place.current-user .podium-avatar {
    box-shadow: 0 0 0 4px var(--color-success), var(--shadow-md);
}

.podium-avatar {
    font-size: 2.5rem;
    background: var(--bg-secondary);
    border-radius: 50%;
    width: 70px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-sm);
    line-height: 1;
}

.podium-place.first .podium-avatar {
    width: 90px;
    height: 90px;
    font-size: 3rem;
    background: linear-gradient(135deg, #FFD700 0%, #FFA500 100%);
}

.podium-place.second .podium-avatar {
    background: linear-gradient(135deg, #E8E8E8 0%, #C0C0C0 100%);
}

.podium-place.third .podium-avatar {
    background: linear-gradient(135deg, #CD7F32 0%, #8B4513 100%);
}

.podium-name {
    font-weight: 800;
    color: var(--text-primary);
    font-size: var(--font-sm);
    text-align: center;
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    margin-bottom: 2px;
}

.podium-points {
    font-size: var(--font-xs);
    color: var(--text-secondary);
    font-weight: 600;
}

.podium-medal {
    font-size: 1.5rem;
    margin-bottom: 4px;
}

.podium-place.first .podium-medal { color: #FFD700; }
.podium-place.second .podium-medal { color: #C0C0C0; }
.podium-place.third .podium-medal { color: #CD7F32; }

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

.ranking-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    border-left: 4px solid transparent;
}

.ranking-item.current-user {
    background: linear-gradient(135deg, rgba(107, 203, 119, 0.1) 0%, var(--bg-secondary) 100%);
    border-left-color: var(--color-success);
    box-shadow: var(--shadow-md);
}

.ranking-position {
    font-size: var(--font-lg);
    font-weight: 800;
    color: var(--text-light);
    min-width: 36px;
    text-align: center;
}

.ranking-item.top-1 .ranking-position { color: #FFD700; }
.ranking-item.top-2 .ranking-position { color: #C0C0C0; }
.ranking-item.top-3 .ranking-position { color: #CD7F32; }

.ranking-avatar {
    font-size: 2.5rem;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-primary);
    border-radius: 50%;
    flex-shrink: 0;
    line-height: 1;
}

.ranking-info {
    flex: 1;
    min-width: 0;
}

.ranking-name {
    font-weight: 700;
    color: var(--text-primary);
    font-size: var(--font-md);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.ranking-substats {
    font-size: var(--font-xs);
    color: var(--text-secondary);
    margin-top: 2px;
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.ranking-substat {
    display: inline-flex;
    align-items: center;
    gap: 2px;
}

.ranking-points {
    font-size: var(--font-lg);
    font-weight: 800;
    color: var(--text-primary);
    text-align: right;
    flex-shrink: 0;
}

.ranking-points-label {
    font-size: var(--font-xs);
    color: var(--text-secondary);
    display: block;
    text-align: right;
    font-weight: 500;
}

.ranking-empty {
    text-align: center;
    padding: var(--spacing-xxl) var(--spacing-lg);
    color: var(--text-secondary);
}

.btn-ranking {
    background: linear-gradient(135deg, #FFD700 0%, #FFA500 100%) !important;
    color: white !important;
    box-shadow: 0 4px 12px rgba(255, 167, 0, 0.3) !important;
}

.btn-ranking:hover {
    box-shadow: 0 6px 16px rgba(255, 167, 0, 0.4) !important;
}

.btn-weekly {
    background: linear-gradient(135deg, #6C5CE7 0%, #A29BFE 100%) !important;
    color: white !important;
    box-shadow: 0 4px 12px rgba(108, 92, 231, 0.3) !important;
}

.btn-weekly:hover {
    box-shadow: 0 6px 16px rgba(108, 92, 231, 0.4) !important;
}

.btn-rewards {
    background: linear-gradient(135deg, #FD79A8 0%, #FDCB6E 100%) !important;
    color: white !important;
    box-shadow: 0 4px 12px rgba(253, 121, 168, 0.3) !important;
}

.btn-rewards:hover {
    box-shadow: 0 6px 16px rgba(253, 121, 168, 0.4) !important;
}

/* ============================================================
   PANTALLA DE RETO SEMANAL
   ============================================================ */
.countdown-card {
    background: linear-gradient(135deg, #6C5CE7 0%, #A29BFE 100%);
    color: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    text-align: center;
    box-shadow: 0 4px 16px rgba(108, 92, 231, 0.3);
}

.countdown-label {
    font-size: var(--font-sm);
    margin-bottom: var(--spacing-sm);
    opacity: 0.9;
}

.countdown-timer {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
}

.countdown-unit {
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    min-width: 60px;
    text-align: center;
    backdrop-filter: blur(10px);
}

.countdown-value {
    display: block;
    font-size: var(--font-xxl);
    font-weight: 900;
    line-height: 1;
}

.countdown-period {
    font-size: var(--font-xs);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    opacity: 0.9;
}

.weekly-history-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-top: var(--spacing-lg);
    box-shadow: var(--shadow-md);
}

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

.weekly-history-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: var(--bg-primary);
    border-radius: var(--radius-md);
}

.weekly-history-avatar {
    font-size: 1.5rem;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: white;
    border-radius: 50%;
    line-height: 1;
}

.weekly-history-info {
    flex: 1;
    min-width: 0;
}

.weekly-history-name {
    font-weight: 700;
    color: var(--text-primary);
    font-size: var(--font-sm);
}

.weekly-history-date {
    font-size: var(--font-xs);
    color: var(--text-secondary);
}

.weekly-history-points {
    font-weight: 800;
    color: var(--color-warning);
    font-size: var(--font-sm);
}

.weekly-history-empty {
    text-align: center;
    color: var(--text-secondary);
    padding: var(--spacing-md);
    font-size: var(--font-sm);
}

/* ============================================================
   PANTALLA DE RECOMPENSAS
   ============================================================ */
.rewards-counter {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background: linear-gradient(135deg, #FD79A8 0%, #FDCB6E 100%);
    color: white;
    border-radius: var(--radius-lg);
    box-shadow: 0 4px 12px rgba(253, 121, 168, 0.3);
}

.rewards-counter-text {
    font-size: var(--font-lg);
    font-weight: 800;
}

.rewards-counter-bar {
    height: 8px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 4px;
    overflow: hidden;
    margin-top: var(--spacing-sm);
}

.rewards-counter-fill {
    height: 100%;
    background: white;
    border-radius: 4px;
    transition: width var(--transition-slow);
}

.rewards-tabs {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    background: var(--bg-primary);
    padding: 4px;
    border-radius: var(--radius-md);
}

.rewards-tab {
    flex: 1;
    background: transparent;
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-weight: 600;
    font-size: var(--font-sm);
    color: var(--text-secondary);
    transition: all var(--transition-normal);
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
}

.rewards-tab.active {
    background: var(--bg-secondary);
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
}

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

@media (min-width: 480px) {
    .rewards-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.reward-item {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    position: relative;
    border: 2px solid transparent;
}

.reward-item.unlocked {
    border-color: var(--color-success);
    background: linear-gradient(135deg, rgba(107, 203, 119, 0.1) 0%, var(--bg-secondary) 100%);
}

.reward-item.locked {
    opacity: 0.5;
    filter: grayscale(0.7);
}

.reward-emoji {
    font-size: 2.5rem;
    display: block;
    margin-bottom: var(--spacing-sm);
    line-height: 1;
}

.reward-item.locked .reward-emoji::after {
    content: '🔒';
    position: absolute;
    font-size: 0.9rem;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(0, 0, 0, 0.4);
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.reward-name {
    font-weight: 800;
    font-size: var(--font-sm);
    color: var(--text-primary);
    margin-bottom: 2px;
}

.reward-description {
    font-size: var(--font-xs);
    color: var(--text-secondary);
    line-height: 1.2;
}

.reward-status {
    margin-top: var(--spacing-sm);
    font-size: var(--font-xs);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.reward-status.unlocked {
    color: var(--color-success);
}

.reward-status.locked {
    color: var(--text-light);
}

/* Avatar premium en el modal */
.avatar-option.premium {
    opacity: 0.5;
    position: relative;
}

.avatar-option.premium::after {
    content: '🔒';
    position: absolute;
    bottom: 2px;
    right: 2px;
    font-size: 0.6rem;
}

.avatar-option.premium.selected {
    opacity: 0.8;
    border-color: var(--color-warning);
    background: rgba(255, 167, 0, 0.1);
}
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', 'Nunito', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    /* Mejorar respuesta táctil en Android */
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    overscroll-behavior: contain;
}

/* ============================================================
   CONTENEDOR PRINCIPAL DE LA APLICACIÓN
   ============================================================ */
.app {
    min-height: 100vh;
    position: relative;
}

/* ============================================================
   PANTALLAS (SECTIONS)
   ============================================================ */
.screen {
    display: none;
    min-height: 100vh;
    padding: var(--spacing-lg);
    animation: fadeIn 0.4s ease;
}

.screen.active {
    display: block;
}

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

/* ============================================================
   CONTENEDOR CENTRAL
   ============================================================ */
.container {
    max-width: 600px;
    margin: 0 auto;
    width: 100%;
}

/* ============================================================
   ENCABEZADO
   ============================================================ */
.header {
    text-align: center;
    padding: var(--spacing-xl) 0;
    animation: bounceIn 0.8s ease;
}

@keyframes bounceIn {
    0% {
        transform: scale(0.5);
        opacity: 0;
    }
    50% {
        transform: scale(1.1);
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

.title {
    font-size: var(--font-hero);
    font-weight: 800;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 50%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: none;
    margin-bottom: var(--spacing-sm);
}

.emoji {
    display: inline-block;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

.subtitle {
    font-size: var(--font-lg);
    color: var(--text-secondary);
    font-weight: 500;
}

/* ============================================================
   TARJETAS (CARDS)
   ============================================================ */
.card {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-lg);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.card-title {
    font-size: var(--font-xl);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.card-title .emoji {
    animation: none;
}

/* ============================================================
   SECCIONES DE CONFIGURACIÓN
   ============================================================ */
.config-section {
    margin-bottom: var(--spacing-xl);
}

.section-title {
    font-size: var(--font-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.section-title .emoji {
    animation: none;
}

.section-hint {
    font-size: var(--font-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

/* ============================================================
   GRID DE TABLAS
   ============================================================ */
.tables-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

@media (max-width: 500px) {
    .tables-grid {
        grid-template-columns: repeat(5, 1fr);
        gap: 0.25rem;
    }
}

.table-checkbox {
    display: none;
}

.table-label {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md) var(--spacing-sm);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    cursor: pointer;
    transition: all var(--transition-normal);
    border: 3px solid transparent;
    font-weight: 700;
    font-size: var(--font-lg);
}

.table-label:hover {
    transform: scale(1.1);
}

/* Estilos para cada tabla con su color */
.table-label[data-table="1"] { background: rgba(255, 107, 107, 0.2); color: var(--table-1); }
.table-label[data-table="2"] { background: rgba(255, 169, 77, 0.2); color: var(--table-2); }
.table-label[data-table="3"] { background: rgba(255, 230, 109, 0.2); color: var(--table-3); }
.table-label[data-table="4"] { background: rgba(107, 203, 119, 0.2); color: var(--table-4); }
.table-label[data-table="5"] { background: rgba(78, 205, 196, 0.2); color: var(--table-5); }
.table-label[data-table="6"] { background: rgba(69, 183, 209, 0.2); color: var(--table-6); }
.table-label[data-table="7"] { background: rgba(108, 92, 231, 0.2); color: var(--table-7); }
.table-label[data-table="8"] { background: rgba(162, 155, 254, 0.2); color: var(--table-8); }
.table-label[data-table="9"] { background: rgba(253, 121, 168, 0.2); color: var(--table-9); }
.table-label[data-table="10"] { background: rgba(116, 185, 255, 0.2); color: var(--table-10); }

.table-checkbox:checked + .table-label {
    border-color: currentColor;
    box-shadow: var(--shadow-md);
    transform: scale(1.05);
}

/* Tablas marcadas */
.table-checkbox:checked + .table-label[data-table="1"] { background: var(--table-1); color: white; }
.table-checkbox:checked + .table-label[data-table="2"] { background: var(--table-2); color: white; }
.table-checkbox:checked + .table-label[data-table="3"] { background: var(--table-3); color: var(--text-primary); }
.table-checkbox:checked + .table-label[data-table="4"] { background: var(--table-4); color: white; }
.table-checkbox:checked + .table-label[data-table="5"] { background: var(--table-5); color: white; }
.table-checkbox:checked + .table-label[data-table="6"] { background: var(--table-6); color: white; }
.table-checkbox:checked + .table-label[data-table="7"] { background: var(--table-7); color: white; }
.table-checkbox:checked + .table-label[data-table="8"] { background: var(--table-8); color: white; }
.table-checkbox:checked + .table-label[data-table="9"] { background: var(--table-9); color: white; }
.table-checkbox:checked + .table-label[data-table="10"] { background: var(--table-10); color: white; }

/* Acciones de tablas */
.tables-actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
}

/* ============================================================
   GRUPOS DE RADIO (NÚMERO DE PREGUNTAS)
   ============================================================ */
.radio-group {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    justify-content: center;
}

.radio-option {
    position: relative;
}

.radio-option input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

.radio-label {
    display: block;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    cursor: pointer;
    transition: all var(--transition-normal);
    font-weight: 600;
    font-size: var(--font-md);
    border: 3px solid transparent;
}

.radio-option input:checked + .radio-label {
    background: var(--color-primary);
    color: var(--text-white);
    border-color: var(--color-primary-dark);
    box-shadow: var(--shadow-md);
    transform: scale(1.05);
}

.radio-label:hover {
    transform: scale(1.05);
}

/* ============================================================
   SELECTOR DE DIFICULTAD
   ============================================================ */
.difficulty-selector {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    justify-content: center;
}

.difficulty-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    border: 3px solid transparent;
    cursor: pointer;
    transition: all var(--transition-normal);
    min-width: 90px;
}

.difficulty-btn .emoji {
    font-size: var(--font-xxl);
    animation: none;
}

.difficulty-btn .diff-name {
    font-weight: 600;
    font-size: var(--font-sm);
    margin-top: var(--spacing-xs);
}

.difficulty-btn:hover {
    transform: translateY(-4px);
}

.difficulty-btn.active {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

.difficulty-btn[data-difficulty="easy"].active {
    background: linear-gradient(135deg, #6BCB77 0%, #4ECDC4 100%);
    color: white;
    border-color: #6BCB77;
}

.difficulty-btn[data-difficulty="normal"].active {
    background: linear-gradient(135deg, #4ECDC4 0%, #45B7D1 100%);
    color: white;
    border-color: #4ECDC4;
}

.difficulty-btn[data-difficulty="hard"].active {
    background: linear-gradient(135deg, #FFA94D 0%, #FF6B6B 100%);
    color: white;
    border-color: #FFA94D;
}

.difficulty-btn[data-difficulty="adaptive"].active {
    background: linear-gradient(135deg, #6C5CE7 0%, #A29BFE 100%);
    color: white;
    border-color: #6C5CE7;
}

.difficulty-btn[data-difficulty="extreme"].active {
    background: linear-gradient(135deg, #2D3436 0%, #636E72 100%);
    color: #FFE66D;
    border-color: #2D3436;
    box-shadow: 0 0 20px rgba(255, 230, 109, 0.4);
}

.difficulty-btn[data-difficulty="extreme"] .emoji {
    animation: shake 2s ease infinite;
}

@keyframes shake {
    0%, 100% { transform: translateX(0) rotate(0); }
    25% { transform: translateX(-3px) rotate(-5deg); }
    75% { transform: translateX(3px) rotate(5deg); }
}

.difficulty-hint {
    text-align: center;
    margin-top: var(--spacing-md);
    font-style: italic;
}

/* ============================================================
   TOGGLE SWITCH (SONIDOS)
   ============================================================ */
.toggle-switch {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    cursor: pointer;
}

.toggle-switch input {
    display: none;
}

.toggle-slider {
    width: 50px;
    height: 28px;
    background: var(--text-light);
    border-radius: 28px;
    position: relative;
    transition: all var(--transition-normal);
    flex-shrink: 0;
}

.toggle-slider::before {
    content: '';
    position: absolute;
    width: 22px;
    height: 22px;
    background: white;
    border-radius: 50%;
    top: 3px;
    left: 3px;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

.toggle-switch input:checked + .toggle-slider {
    background: var(--color-success);
}

.toggle-switch input:checked + .toggle-slider::before {
    transform: translateX(22px);
}

.toggle-label {
    font-weight: 600;
    font-size: var(--font-sm);
    min-width: 70px;
    text-align: left;
}

/* Layout horizontal de toggles múltiples */
.toggle-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.toggle-row:last-of-type {
    border-bottom: none;
}

.toggle-row-label {
    font-weight: 600;
    font-size: var(--font-md);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 4px;
}

.toggle-hint {
    text-align: center;
    margin-top: var(--spacing-md);
    margin-bottom: 0;
    font-size: var(--font-xs);
    color: var(--text-secondary);
    line-height: 1.4;
}

.sounds-section {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--bg-primary);
    border-bottom: 1px solid var(--bg-primary);
}

/* ============================================================
   BOTONES
   ============================================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    font-size: var(--font-md);
    font-weight: 700;
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
    /* Touch-friendly para Android */
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    min-height: 44px;
    user-select: none;
}

.btn .emoji {
    animation: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

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

.btn-secondary {
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 2px solid var(--text-light);
}

.btn-secondary:hover {
    background: var(--text-light);
    color: white;
}

.btn-danger {
    background: linear-gradient(135deg, var(--color-danger) 0%, var(--color-danger-dark) 100%);
    color: white;
}

.btn-danger:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-small {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-sm);
}

.btn-large {
    padding: var(--spacing-lg) var(--spacing-xxl);
    font-size: var(--font-xl);
}

.btn-start {
    width: 100%;
    margin-top: var(--spacing-xl);
    padding: var(--spacing-xl) var(--spacing-xxl);
    font-size: var(--font-xl);
    background: linear-gradient(135deg, var(--color-success) 0%, var(--color-secondary) 100%);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        box-shadow: 0 0 0 0 rgba(107, 203, 119, 0.4);
    }
    50% {
        box-shadow: 0 0 0 20px rgba(107, 203, 119, 0);
    }
}

.btn-start:hover {
    animation: none;
    transform: scale(1.05);
}

.btn-control {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-full);
    padding: 0;
    font-size: var(--font-xl);
}

.btn-control .emoji {
    font-size: var(--font-xxl);
}

.btn-control:hover {
    transform: scale(1.1);
}

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

.btn-back {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-full);
    padding: 0;
    font-size: var(--font-lg);
}

.btn-icon {
    flex-direction: column;
    padding: var(--spacing-md);
    min-width: 100px;
}

.btn-icon .emoji {
    font-size: var(--font-xxl);
}

.btn-icon .btn-text {
    font-size: var(--font-sm);
    margin-top: var(--spacing-xs);
}

/* ============================================================
   BOTONES DE NAVEGACIÓN INFERIOR
   ============================================================ */
.nav-buttons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
    flex-wrap: wrap;
}

/* ============================================================
   PANTALLA DE JUEGO
   ============================================================ */
.game-container {
    max-width: 600px;
    margin: 0 auto;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.game-header {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    position: relative;
}

/* Indicador de guardado */
.save-indicator {
    position: absolute;
    top: 8px;
    right: 12px;
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 0.7rem;
    color: var(--text-light);
    font-weight: 600;
    opacity: 0.5;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.save-indicator.flash {
    animation: saveFlash 1.2s ease;
}

@keyframes saveFlash {
    0% { opacity: 0.5; transform: scale(1); }
    20% { opacity: 1; transform: scale(1.1); color: var(--color-success); }
    100% { opacity: 0.5; transform: scale(1); }
}

.save-icon {
    font-size: 0.85rem;
}

.save-text {
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.game-stats-top {
    display: flex;
    justify-content: space-around;
    margin-bottom: var(--spacing-lg);
}

.stat-item {
    text-align: center;
}

.stat-icon {
    font-size: var(--font-xxl);
}

.stat-value {
    display: block;
    font-size: var(--font-xl);
    font-weight: 800;
    color: var(--text-primary);
}

.stat-label {
    font-size: var(--font-xs);
    color: var(--text-secondary);
    text-transform: uppercase;
}

/* Barra de progreso */
.progress-section {
    margin-bottom: var(--spacing-md);
}

.progress-bar {
    height: 12px;
    background: var(--bg-primary);
    border-radius: 10px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-success) 0%, var(--color-secondary) 100%);
    border-radius: 10px;
    transition: width var(--transition-normal);
    width: 0%;
}

.progress-text {
    display: block;
    text-align: center;
    margin-top: var(--spacing-xs);
    font-size: var(--font-sm);
    color: var(--text-secondary);
    font-weight: 600;
}

/* Display de racha */
.streak-display {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: linear-gradient(135deg, #FF6B6B 0%, #FFA94D 100%);
    border-radius: var(--radius-lg);
    color: white;
    font-weight: 700;
    font-size: var(--font-lg);
    opacity: 0;
    transform: scale(0.8);
    transition: all var(--transition-normal);
}

.streak-display.active {
    opacity: 1;
    transform: scale(1);
}

.streak-display.animate {
    animation: streakPop 0.5s ease;
}

@keyframes streakPop {
    0% { transform: scale(1); }
    50% { transform: scale(1.3); }
    100% { transform: scale(1); }
}

.streak-icon {
    font-size: var(--font-xxl);
    animation: fire 0.5s ease infinite;
}

@keyframes fire {
    0%, 100% { transform: scale(1) rotate(-5deg); }
    50% { transform: scale(1.1) rotate(5deg); }
}

.multiplier {
    background: rgba(255, 255, 255, 0.3);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: var(--font-sm);
}

/* Área de pregunta */
.question-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.question-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xxl) var(--spacing-xxl);
    box-shadow: var(--shadow-lg);
    text-align: center;
    width: 100%;
    max-width: 400px;
    transition: all var(--transition-normal);
}

.question-card.correct {
    animation: correctPulse 0.6s ease;
    box-shadow: var(--shadow-glow-success);
}

@keyframes correctPulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); background: rgba(107, 203, 119, 0.1); }
    100% { transform: scale(1); }
}

.question-card.incorrect {
    animation: incorrectShake 0.6s ease;
    box-shadow: var(--shadow-glow);
}

@keyframes incorrectShake {
    0%, 100% { transform: translateX(0); }
    20% { transform: translateX(-20px); }
    40% { transform: translateX(20px); }
    60% { transform: translateX(-20px); }
    80% { transform: translateX(20px); }
}

.question-text {
    font-size: var(--font-hero);
    font-weight: 800;
    color: var(--text-primary);
}

/* Temporizador */
.timer-container {
    width: 100%;
    max-width: 400px;
    margin-top: var(--spacing-lg);
    text-align: center;
}

.timer-bar {
    height: 8px;
    background: var(--bg-primary);
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
}

.timer-fill {
    height: 100%;
    background: var(--color-success);
    border-radius: 10px;
    transition: width 0.1s linear, background-color var(--transition-normal);
    width: 100%;
}

.timer-fill.warning {
    background: var(--color-warning);
}

.timer-fill.danger {
    background: var(--color-danger);
}

.timer-text {
    font-size: var(--font-lg);
    font-weight: 700;
    color: var(--text-secondary);
}

/* Grid de respuestas */
.answers-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    max-width: 500px;
    margin: 0 auto;
    width: 100%;
}

.answer-btn {
    padding: var(--spacing-xl);
    font-size: var(--font-xxl);
    font-weight: 800;
    background: var(--bg-secondary);
    border: 4px solid var(--text-light);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    user-select: none;
    min-height: 80px;
}

.answer-btn:hover:not(:disabled) {
    transform: scale(1.05);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

.answer-btn:active:not(:disabled) {
    transform: scale(0.95);
}

.answer-btn.correct {
    background: var(--color-success);
    border-color: var(--color-success);
    color: white;
    animation: correctPop 0.4s ease;
}

@keyframes correctPop {
    0% { transform: scale(1); }
    50% { transform: scale(1.15); }
    100% { transform: scale(1); }
}

.answer-btn.incorrect {
    background: var(--color-danger);
    border-color: var(--color-danger);
    color: white;
    animation: incorrectPop 0.4s ease;
}

@keyframes incorrectPop {
    0%, 100% { transform: rotate(0); }
    25% { transform: rotate(-10deg); }
    75% { transform: rotate(10deg); }
}

.answer-btn:disabled {
    cursor: not-allowed;
    opacity: 0.7;
}

/* ============================================================
   ÁREA DE INPUT (MODO EXTREMO)
   ============================================================ */
.answer-input-area {
    width: 100%;
    max-width: 500px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    animation: slideUp 0.4s ease;
}

.input-label {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    font-size: var(--font-lg);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.input-label .emoji {
    animation: none;
}

.input-wrapper {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
}

.answer-input {
    flex: 1;
    min-width: 120px;
    max-width: 200px;
    padding: var(--spacing-lg) var(--spacing-xl);
    font-size: 3rem;
    font-weight: 900;
    text-align: center;
    border: 4px solid var(--text-light);
    border-radius: var(--radius-lg);
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: all var(--transition-normal);
    font-family: inherit;
    outline: none;
    -moz-appearance: textfield;
    /* Prevenir zoom en iOS/Android al hacer focus */
    transform: translateZ(0);
    -webkit-tap-highlight-color: transparent;
}

.answer-input::-webkit-outer-spin-button,
.answer-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.answer-input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(255, 107, 107, 0.2);
    transform: scale(1.05);
}

.answer-input.correct {
    border-color: var(--color-success);
    background: rgba(107, 203, 119, 0.1);
    color: var(--color-success);
    animation: inputCorrect 0.5s ease;
}

@keyframes inputCorrect {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.15); }
}

.answer-input.incorrect {
    border-color: var(--color-danger);
    background: rgba(255, 107, 107, 0.1);
    color: var(--color-danger);
    animation: inputIncorrect 0.5s ease;
}

@keyframes inputIncorrect {
    0%, 100% { transform: translateX(0); }
    20% { transform: translateX(-15px); }
    40% { transform: translateX(15px); }
    60% { transform: translateX(-15px); }
    80% { transform: translateX(15px); }
}

.btn-submit {
    padding: var(--spacing-lg) var(--spacing-xl);
    font-size: var(--font-lg);
    min-width: 140px;
}

.input-hint {
    text-align: center;
    margin-top: var(--spacing-md);
    font-size: var(--font-sm);
    color: var(--text-secondary);
}

.input-hint kbd {
    display: inline-block;
    padding: 2px 8px;
    background: var(--bg-primary);
    border: 2px solid var(--text-light);
    border-radius: 4px;
    font-family: monospace;
    font-size: var(--font-sm);
    font-weight: 700;
    box-shadow: 0 2px 0 var(--text-light);
}

/* Mostrar respuesta correcta tras error en modo extremo */
.correct-answer-display {
    text-align: center;
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(107, 203, 119, 0.2);
    border-radius: var(--radius-md);
    color: var(--color-success-dark);
    font-weight: 700;
    animation: fadeIn 0.3s ease;
}

@media (max-width: 480px) {
    .answer-input {
        font-size: 2rem;
        padding: var(--spacing-md);
    }
    
    .input-wrapper {
        flex-direction: column;
    }
    
    .answer-input,
    .btn-submit {
        width: 100%;
        max-width: none;
    }
}

/* Controles del juego */
.game-controls {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-lg);
    max-width: 200px;
    margin: 0 auto;
}

/* ============================================================
   PANTALLA DE PAUSA
   ============================================================ */
.pause-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-overlay);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.pause-overlay.active {
    opacity: 1;
    visibility: visible;
}

.pause-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xxl);
    max-width: 400px;
    width: 90%;
    text-align: center;
    transform: scale(0.8);
    transition: transform var(--transition-normal);
}

.pause-overlay.active .pause-card {
    transform: scale(1);
}

.pause-title {
    font-size: var(--font-xxl);
    font-weight: 800;
    margin-bottom: var(--spacing-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.pause-title .emoji {
    animation: none;
}

.pause-stats {
    margin-bottom: var(--spacing-xl);
}

.pause-stat {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    font-size: var(--font-lg);
}

.pause-stat .emoji {
    animation: none;
}

.pause-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.pause-buttons .btn {
    width: 100%;
}

/* ============================================================
   PANTALLA DE RESULTADOS
   ============================================================ */
.results-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
    max-width: 600px;
    margin: 0 auto;
    animation: slideUp 0.6s ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.results-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.results-title {
    font-size: var(--font-xxl);
    font-weight: 800;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.results-title .emoji {
    animation: none;
}

.result-emoji {
    font-size: var(--font-hero);
    animation: bounce 1s ease infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

/* Puntuación principal */
.main-score {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-xl);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    border-radius: var(--radius-lg);
    color: white;
}

.score-display {
    margin-bottom: var(--spacing-md);
}

.score-value {
    font-size: 4rem;
    font-weight: 900;
    display: block;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.score-label {
    font-size: var(--font-xl);
    text-transform: uppercase;
    opacity: 0.9;
}

.xp-gained {
    font-size: var(--font-xl);
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

/* Grid de estadísticas */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.result-stat {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--bg-primary);
    border-radius: var(--radius-md);
}

.result-stat .emoji {
    font-size: var(--font-xxl);
    animation: none;
}

.result-stat-content {
    display: flex;
    flex-direction: column;
}

.result-value {
    font-size: var(--font-xl);
    font-weight: 800;
    color: var(--text-primary);
}

.result-label {
    font-size: var(--font-xs);
    color: var(--text-secondary);
}

/* Recomendaciones */
.recommendations {
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: rgba(108, 92, 231, 0.1);
    border-radius: var(--radius-md);
    border-left: 4px solid #6C5CE7;
}

.recommendations-title {
    font-size: var(--font-lg);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.recommendations-title .emoji {
    animation: none;
}

.recommendations-list {
    list-style: none;
}

.recommendations-list li {
    padding: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
    position: relative;
    color: var(--text-secondary);
}

.recommendations-list li::before {
    content: '💡';
    position: absolute;
    left: 0;
}

/* Medallas obtenidas */
.achievements-earned {
    margin-bottom: var(--spacing-xl);
}

.achievements-title {
    font-size: var(--font-lg);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.achievements-title .emoji {
    animation: none;
}

.achievements-grid {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    justify-content: center;
}

.achievement-badge {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-xxl);
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-warning) 100%);
    box-shadow: var(--shadow-md);
    animation: badgePop 0.5s ease backwards;
}

@keyframes badgePop {
    from {
        transform: scale(0);
        opacity: 0;
    }
    to {
        transform: scale(1);
        opacity: 1;
    }
}

/* Nivel y XP */
.level-xp-display {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--bg-primary);
    border-radius: var(--radius-md);
}

.level-display {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-xl);
    font-weight: 800;
}

.xp-progress {
    flex: 1;
    max-width: 200px;
}

.xp-bar {
    height: 12px;
    background: var(--text-light);
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: var(--spacing-xs);
}

.xp-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-warning) 100%);
    border-radius: 10px;
    transition: width var(--transition-slow);
    width: 0%;
}

.xp-text {
    font-size: var(--font-sm);
    color: var(--text-secondary);
    text-align: center;
    display: block;
}

/* Botones de resultados */
.results-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.results-buttons .btn {
    width: 100%;
}

/* ============================================================
   PANTALLAS DE ESTADÍSTICAS, PROGRESO Y LOGROS
   ============================================================ */
.screen-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.screen-title {
    font-size: var(--font-xxl);
    font-weight: 800;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.screen-title .emoji {
    animation: none;
}

/* Resumen de estadísticas */
.stats-summary-card,
.stats-by-table-card,
.hardest-operations-card,
.level-card,
.chart-card,
.mastered-card,
.progress-summary-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-lg);
}

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

.summary-stat {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--bg-primary);
    border-radius: var(--radius-md);
}

.summary-stat .emoji {
    font-size: var(--font-xl);
    animation: none;
}

.summary-value {
    display: block;
    font-size: var(--font-xl);
    font-weight: 800;
    color: var(--text-primary);
}

.summary-label {
    font-size: var(--font-xs);
    color: var(--text-secondary);
}

/* Estadísticas por tabla */
.tables-stats-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--spacing-sm);
}

.table-stat {
    text-align: center;
    padding: var(--spacing-sm);
    background: var(--bg-primary);
    border-radius: var(--radius-md);
}

.table-stat-header {
    font-size: var(--font-lg);
    font-weight: 800;
    margin-bottom: var(--spacing-xs);
}

.table-stat-value {
    font-size: var(--font-sm);
    font-weight: 600;
}

.table-stat-bar {
    height: 4px;
    background: var(--text-light);
    border-radius: 4px;
    margin-top: var(--spacing-xs);
    overflow: hidden;
}

.table-stat-fill {
    height: 100%;
    border-radius: 4px;
    transition: width var(--transition-normal);
}

/* Operaciones más difíciles */
.hardest-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.hardest-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md);
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--color-danger);
}

.hardest-operation {
    font-size: var(--font-lg);
    font-weight: 700;
}

.hardest-stats {
    text-align: right;
}

.hardest-accuracy {
    font-weight: 700;
    color: var(--color-danger);
}

.hardest-attempts {
    font-size: var(--font-xs);
    color: var(--text-secondary);
}

/* Nivel card */
.level-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.level-badge {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-hero);
    color: white;
    box-shadow: var(--shadow-lg);
}

.level-number {
    font-size: var(--font-xxl);
    font-weight: 900;
}

.level-info {
    flex: 1;
}

.level-title {
    font-size: var(--font-xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.level-xp-bar {
    height: 16px;
    background: var(--text-light);
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: var(--spacing-xs);
}

.level-xp-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-warning) 100%);
    border-radius: 10px;
    transition: width var(--transition-slow);
}

/* Gráfico de barras */
.bars-chart {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.bar-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.bar-label {
    width: 40px;
    font-weight: 700;
    font-size: var(--font-lg);
}

.bar-container {
    flex: 1;
    height: 30px;
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.bar-fill {
    height: 100%;
    border-radius: var(--radius-md);
    transition: width var(--transition-slow);
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding-right: var(--spacing-sm);
    font-weight: 700;
    font-size: var(--font-sm);
    color: white;
    min-width: fit-content;
}

.bar-value {
    width: 50px;
    text-align: right;
    font-weight: 700;
    font-size: var(--font-md);
}

/* Grid de operaciones dominadas */
.mastered-count {
    text-align: center;
    font-size: var(--font-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--color-success);
}

.mastered-grid {
    display: grid;
    grid-template-columns: repeat(10, 1fr);
    gap: var(--spacing-xs);
}

.mastered-item {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-xs);
    font-weight: 700;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.mastered-item.not-started {
    background: var(--bg-primary);
    color: var(--text-light);
}

.mastered-item.learning {
    background: rgba(255, 169, 77, 0.3);
    color: var(--table-2);
}

.mastered-item.practicing {
    background: rgba(78, 205, 196, 0.3);
    color: var(--table-5);
}

.mastered-item.mastered {
    background: var(--color-success);
    color: white;
    box-shadow: var(--shadow-sm);
}

/* Resumen de progreso */
.progress-summary-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.progress-stat {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--bg-primary);
    border-radius: var(--radius-md);
}

.progress-stat .emoji {
    font-size: var(--font-xl);
    animation: none;
}

.progress-value {
    display: block;
    font-size: var(--font-xl);
    font-weight: 800;
    color: var(--text-primary);
}

.progress-label {
    font-size: var(--font-xs);
    color: var(--text-secondary);
}

/* ============================================================
   LISTA DE LOGROS
   ============================================================ */
.achievements-counter {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.counter-text {
    font-size: var(--font-xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    display: block;
}

.counter-bar {
    height: 12px;
    background: var(--text-light);
    border-radius: 10px;
    overflow: hidden;
}

.counter-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-warning) 100%);
    border-radius: 10px;
    transition: width var(--transition-slow);
}

.achievements-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.achievement-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.achievement-item.locked {
    opacity: 0.5;
    filter: grayscale(1);
}

.achievement-item.unlocked {
    border-left: 4px solid var(--color-accent);
}

.achievement-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-xxl);
    background: var(--bg-primary);
    flex-shrink: 0;
}

.achievement-item.unlocked .achievement-icon {
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-warning) 100%);
    box-shadow: var(--shadow-glow-gold);
}

.achievement-info {
    flex: 1;
}

.achievement-name {
    font-size: var(--font-lg);
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.achievement-description {
    font-size: var(--font-sm);
    color: var(--text-secondary);
}

.achievement-item.unlocked .achievement-name {
    color: var(--color-primary);
}

/* ============================================================
   OVERLAYS (LEVEL UP, MEDALLA, RÉCORD) - TOAST MÓVIL
   ============================================================ */
.level-up-overlay,
.medal-overlay,
.record-overlay {
    position: fixed;
    top: 12px;
    left: 0;
    right: 0;
    bottom: auto;
    background: transparent;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    z-index: var(--z-notification);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-normal);
    pointer-events: none;
    padding: 0 12px;
}

.level-up-overlay.active,
.medal-overlay.active,
.record-overlay.active {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

/* Toast card base */
.level-up-content,
.medal-content,
.record-content {
    color: var(--text-primary);
    border-radius: var(--radius-lg);
    padding: 12px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    max-width: 420px;
    width: 100%;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.18);
    transform: translateY(-20px);
    transition: transform 0.3s ease;
    background: var(--bg-secondary);
}

.level-up-overlay.active .level-up-content,
.medal-overlay.active .medal-content,
.record-overlay.active .record-content {
    transform: translateY(0);
    animation: toastSlideDown 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* Variantes por tipo con borde de color */
.level-up-content {
    border-left: 5px solid var(--color-primary);
    background: linear-gradient(135deg, #FFF5F5 0%, #FFFFFF 100%);
}

.medal-content {
    border-left: 5px solid var(--color-warning);
    background: linear-gradient(135deg, #FFFBEB 0%, #FFFFFF 100%);
}

.record-content {
    border-left: 5px solid var(--color-secondary);
    background: linear-gradient(135deg, #E0F7FA 0%, #FFFFFF 100%);
}

@keyframes toastSlideDown {
    0% {
        transform: translateY(-40px);
        opacity: 0;
    }
    100% {
        transform: translateY(0);
        opacity: 1;
    }
}

/* Elementos del toast */
.toast-emoji {
    font-size: 2.25rem;
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 230, 109, 0.2);
    border-radius: 50%;
    line-height: 1;
}

.level-up-content .toast-emoji {
    background: rgba(255, 107, 107, 0.15);
}

.medal-content .toast-emoji {
    background: rgba(255, 169, 77, 0.2);
}

.record-content .toast-emoji {
    background: rgba(78, 205, 196, 0.2);
}

.level-up-overlay.active .toast-emoji,
.medal-overlay.active .toast-emoji,
.record-overlay.active .toast-emoji {
    animation: toastEmojiBounce 0.6s ease 0.1s;
}

@keyframes toastEmojiBounce {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.2) rotate(-10deg); }
}

.toast-text {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
}

.toast-title {
    font-size: 0.95rem;
    font-weight: 800;
    color: var(--text-primary);
    line-height: 1.2;
}

.toast-subtitle {
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.3;
    font-weight: 500;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

.toast-close {
    background: transparent;
    border: none;
    color: var(--text-light);
    font-size: 1.1rem;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 50%;
    transition: all 0.2s ease;
    flex-shrink: 0;
    line-height: 1;
    min-width: 32px;
    min-height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.toast-close:hover,
.toast-close:active {
    background: var(--bg-primary);
    color: var(--text-primary);
}

/* Ajustes para móvil pequeño */
@media (max-width: 480px) {
    .level-up-overlay,
    .medal-overlay,
    .record-overlay {
        top: 8px;
        padding: 0 8px;
    }
    
    .level-up-content,
    .medal-content,
    .record-content {
        padding: 10px 12px;
        gap: 10px;
    }
    
    .toast-emoji {
        width: 38px;
        height: 38px;
        font-size: 1.85rem;
    }
    
    .toast-title {
        font-size: 0.9rem;
    }
    
    .toast-subtitle {
        font-size: 0.75rem;
    }
}

/* ============================================================
   RESPONSIVE DESIGN
   ============================================================ */

/* Tablets */
@media (max-width: 768px) {
    :root {
        --font-hero: 2.5rem;
        --font-xxl: 1.75rem;
    }
    
    .tables-grid {
        grid-template-columns: repeat(5, 1fr);
    }
    
    .radio-group {
        flex-direction: column;
    }
    
    .difficulty-selector {
        flex-direction: column;
    }
    
    .difficulty-btn {
        flex-direction: row;
        justify-content: flex-start;
        gap: var(--spacing-md);
    }
    
    .nav-buttons {
        flex-direction: column;
    }
    
    .btn-icon {
        flex-direction: row;
        width: 100%;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .summary-grid {
        grid-template-columns: 1fr;
    }
    
    .progress-summary-grid {
        grid-template-columns: 1fr;
    }
    
    .tables-stats-grid {
        grid-template-columns: repeat(5, 1fr);
    }
    
    .mastered-grid {
        grid-template-columns: repeat(10, 1fr);
    }
    
    .answers-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-sm);
    }
    
    .answer-btn {
        padding: var(--spacing-lg);
        font-size: var(--font-xl);
    }
}

/* Móviles */
@media (max-width: 480px) {
    :root {
        --font-hero: 2rem;
        --font-xxl: 1.5rem;
        --spacing-lg: 1rem;
        --spacing-xl: 1.5rem;
    }
    
    .screen {
        padding: var(--spacing-md);
    }
    
    .card {
        padding: var(--spacing-lg);
        border-radius: var(--radius-md);
    }
    
    .tables-grid {
        grid-template-columns: repeat(5, 1fr);
        gap: 0.25rem;
    }
    
    .table-label {
        padding: var(--spacing-sm) 0;
        font-size: var(--font-md);
    }
    
    .question-card {
        padding: var(--spacing-xl);
    }
    
    .question-text {
        font-size: var(--font-xxl);
    }
    
    .answer-btn {
        padding: var(--spacing-md);
        font-size: var(--font-lg);
    }
    
    .game-stats-top {
        flex-wrap: wrap;
        gap: var(--spacing-sm);
    }
    
    .stat-item {
        flex: 1 1 30%;
    }
    
    .level-header {
        flex-direction: column;
        text-align: center;
    }
    
    .bars-chart {
        gap: var(--spacing-sm);
    }
    
    .bar-label {
        width: 30px;
        font-size: var(--font-sm);
    }
    
    .bar-value {
        width: 40px;
        font-size: var(--font-xs);
    }
    
    .achievement-item {
        padding: var(--spacing-md);
    }
    
    .achievement-icon {
        width: 50px;
        height: 50px;
        font-size: var(--font-xl);
    }
    
    .score-value {
        font-size: 3rem;
    }
}

/* Pantallas muy pequeñas */
@media (max-width: 360px) {
    :root {
        --font-hero: 1.75rem;
    }
    
    .tables-grid {
        gap: 0.15rem;
    }
    
    .table-label {
        padding: var(--spacing-xs) 0;
        font-size: var(--font-sm);
    }
}

/* Orientación landscape en móviles */
@media (max-height: 500px) and (orientation: landscape) {
    .game-container {
        flex-direction: row;
        flex-wrap: wrap;
    }
    
    .game-header {
        width: 100%;
        margin-bottom: var(--spacing-sm);
    }
    
    .question-area {
        flex: 1;
        margin-bottom: var(--spacing-sm);
    }
    
    .answers-grid {
        flex-direction: row;
        flex-wrap: wrap;
    }
    
    .answer-btn {
        flex: 1 1 40%;
    }
}

/* Pantallas grandes */
@media (min-width: 1200px) {
    .container {
        max-width: 800px;
    }
    
    .game-container {
        max-width: 800px;
    }
    
    .answers-grid {
        max-width: 600px;
    }
}

/* ============================================================
   UTILIDADES
   ============================================================ */

/* Ocultar elemento */
.hidden {
    display: none !important;
}

/* Animación de carga */
.loading {
    animation: loading 1s ease-in-out infinite;
}

@keyframes loading {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* Scrollbar personalizado */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--text-light);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* Selección de texto */
::selection {
    background: var(--color-primary);
    color: white;
}

/* Focus visible para accesibilidad */
.btn:focus-visible,
.difficulty-btn:focus-visible,
.table-label:focus-visible,
.radio-label:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 2px;
}

/* Animación de entrada para elementos */
.animate-in {
    animation: animateIn 0.4s ease forwards;
}

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

/* Estrellas de fondo (decoración) */
.stars-bg {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    z-index: -1;
    background: 
        radial-gradient(2px 2px at 20px 30px, var(--color-accent), transparent),
        radial-gradient(2px 2px at 40px 70px, var(--color-primary), transparent),
        radial-gradient(2px 2px at 50px 160px, var(--color-secondary), transparent),
        radial-gradient(2px 2px at 90px 40px, var(--color-success), transparent),
        radial-gradient(2px 2px at 130px 80px, var(--color-accent), transparent),
        radial-gradient(2px 2px at 160px 120px, var(--color-primary), transparent);
    background-repeat: repeat;
    background-size: 200px 200px;
    animation: twinkle 4s linear infinite;
    opacity: 0.3;
}

@keyframes twinkle {
    from { transform: translateY(0); }
    to { transform: translateY(-200px); }
}