/* Reset y variables CSS */
:root {
    /* Colores principales */
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --secondary-color: #f59e0b;
    --accent-color: #ec4899;
    
    /* Colores de fondo */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-dark: #0f172a;
    --bg-card: #ffffff;
    
    /* Colores de texto */
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --text-white: #ffffff;
    
    /* Colores de estado */
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
    --info-color: #3b82f6;
    
    /* Sombras */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    /* Bordes */
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --border-radius-lg: 16px;
    --border-color: #e2e8f0;
    
    /* Espaciado */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Transiciones */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Contenedor principal */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Loader */
.loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    color: var(--text-white);
    transition: opacity var(--transition-slow), visibility var(--transition-slow);
}

.loader.hidden {
    opacity: 0;
    visibility: hidden;
}

.emoji-spinner {
    font-size: 4rem;
    animation: spin 2s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Header */
.header {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(12px);
    background: rgba(255, 255, 255, 0.95);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-emoji {
    font-size: 2rem;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* Navegación desktop */
.nav-desktop {
    display: flex;
    gap: var(--spacing-sm);
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    background: transparent;
    color: var(--text-secondary);
    border-radius: var(--border-radius-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.nav-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.nav-btn.active {
    background: var(--primary-color);
    color: var(--text-white);
}

/* Main content */
.main {
    padding: var(--spacing-xl) 0;
    min-height: calc(100vh - 80px);
    padding-bottom: calc(var(--spacing-xl) + 80px); /* Espacio para navegación móvil */
}

/* Daily Streak Card */
.daily-streak-card {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: var(--text-white);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
    animation: slideDown 0.5s ease-out;
}

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

.streak-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
}

.daily-emoji-section {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.daily-emoji {
    font-size: 3rem;
    cursor: pointer;
    transition: transform var(--transition-fast);
}

.daily-emoji:hover {
    transform: scale(1.1);
}

.daily-info h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

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

.streak-count {
    font-weight: 600;
    font-size: 1.1rem;
}

.close-streak {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: var(--text-white);
    width: 32px;
    height: 32px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition-fast);
}

.close-streak:hover {
    background: rgba(255, 255, 255, 0.3);
}

.daily-challenge {
    background: rgba(255, 255, 255, 0.15);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-sm);
    font-size: 0.9rem;
}

/* Secciones */
.section {
    display: none;
    animation: fadeIn 0.3s ease-in-out;
}

.section.active {
    display: block;
}

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

.section h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    text-align: center;
}

.section-subtitle {
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: var(--spacing-xl);
    font-size: 1.1rem;
}

/* Mix Section */
.mix-container {
    max-width: 800px;
    margin: 0 auto;
}

.emoji-mixer {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
    flex-wrap: wrap;
}

.emoji-selector {
    text-align: center;
    flex: 1;
    min-width: 200px;
}

.emoji-btn {
    width: 120px;
    height: 120px;
    border: 3px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    background: var(--bg-card);
    font-size: 4rem;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-md);
}

.emoji-btn:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.emoji-name {
    font-weight: 500;
    color: var(--text-primary);
}

.combinations-btn {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.combinations-btn:hover {
    background: var(--primary-color);
    color: var(--text-white);
    border-color: var(--primary-color);
}

.plus-icon {
    font-size: 2rem;
    color: var(--text-muted);
    flex-shrink: 0;
}

/* Result Section */
.result-section {
    display: flex;
    justify-content: center;
}

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

.result-image-container {
    position: relative;
    margin-bottom: var(--spacing-lg);
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.result-image {
    max-width: 300px;
    max-height: 300px;
    width: 90%;
    height: auto;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-normal);
}

.result-image:hover {
    transform: scale(1.02);
}

.loading-spinner {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--bg-tertiary);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.action-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--border-color);
    background: var(--bg-card);
    color: var(--text-primary);
    border-radius: var(--border-radius-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.action-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-1px);
}

.action-btn.like-btn.liked {
    background: var(--accent-color);
    border-color: var(--accent-color);
    color: var(--text-white);
}

.action-btn.danger {
    border-color: var(--error-color);
    color: var(--error-color);
}

.action-btn.danger:hover {
    background: var(--error-color);
    color: var(--text-white);
}

/* Explore Section */
.search-bar {
    display: flex;
    max-width: 500px;
    margin: 0 auto var(--spacing-lg);
    gap: var(--spacing-sm);
}

.search-input {
    flex: 1;
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-size: 1rem;
    background: var(--bg-card);
    transition: border-color var(--transition-fast);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.search-btn {
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--primary-color);
    color: var(--text-white);
    border: none;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: background var(--transition-fast);
}

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

/* Categories */
.categories {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-xl);
}

.category-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--border-color);
    background: var(--bg-card);
    color: var(--text-secondary);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-weight: 500;
}

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

.category-btn.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: var(--text-white);
}

/* Grids */
.explore-grid,
.saved-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.combination-card {
    background: var(--bg-card);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: all var(--transition-normal);
    cursor: pointer;
}

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

.combination-emojis {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
}

.combination-image {
    width: 120px;
    height: 120px;
    object-fit: contain;
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-sm);
}

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

.combination-actions .action-btn {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.9rem;
}

/* Saved Section */
.saved-stats {
    display: flex;
    gap: var(--spacing-xl);
    justify-content: center;
    margin-bottom: var(--spacing-xl);
}

.stat {
    text-align: center;
    background: var(--bg-card);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    min-width: 120px;
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

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

.saved-actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

.empty-state {
    text-align: center;
    padding: var(--spacing-2xl);
    background: var(--bg-card);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
}

.empty-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
}

.empty-state h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.empty-state p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.cta-btn {
    background: var(--primary-color);
    color: var(--text-white);
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: var(--border-radius-sm);
    font-weight: 600;
    cursor: pointer;
    transition: background var(--transition-fast);
}

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

.load-more-container {
    text-align: center;
}

.load-more-btn {
    background: var(--bg-card);
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--border-radius-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.load-more-btn:hover {
    background: var(--primary-color);
    color: var(--text-white);
}

/* Bottom Navigation (Mobile) */
.bottom-nav {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--bg-card);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-sm) 0;
    z-index: 100;
    backdrop-filter: blur(12px);
    background: rgba(255, 255, 255, 0.95);
}

.bottom-nav {
    display: flex;
    justify-content: space-around;
    align-items: center;
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm);
    border: none;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: color var(--transition-fast);
    font-size: 0.8rem;
}

.nav-item:hover,
.nav-item.active {
    color: var(--primary-color);
}

.nav-item i {
    font-size: 1.2rem;
}

/* Modales */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    backdrop-filter: blur(4px);
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
    animation: modalFadeIn 0.3s ease-out;
}

@keyframes modalFadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.modal-content {
    background: var(--bg-card);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
    max-width: 500px;
    width: 90vw;
    max-height: 80vh;
    overflow: hidden;
    animation: modalSlideUp 0.3s ease-out;
}

.modal-content.large {
    max-width: 800px;
}

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

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.close-modal {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

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

.modal-body {
    padding: var(--spacing-lg);
    max-height: 60vh;
    overflow-y: auto;
}

/* Emoji Grid */
.emoji-search {
    margin-bottom: var(--spacing-lg);
}

.emoji-search input {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-size: 1rem;
    background: var(--bg-secondary);
}

.emoji-search input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.emoji-categories {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    overflow-x: auto;
    padding-bottom: var(--spacing-sm);
}

.emoji-category-btn {
    padding: var(--spacing-sm);
    border: 2px solid var(--border-color);
    background: var(--bg-secondary);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 1.5rem;
    min-width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.emoji-category-btn:hover,
.emoji-category-btn.active {
    border-color: var(--primary-color);
    background: var(--primary-color);
    transform: scale(1.05);
}

.emoji-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(50px, 1fr));
    gap: var(--spacing-sm);
    max-height: 300px;
    overflow-y: auto;
}

.emoji-item {
    padding: var(--spacing-sm);
    border: 2px solid transparent;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 1.5rem;
    text-align: center;
    background: var(--bg-secondary);
}

.emoji-item:hover {
    border-color: var(--primary-color);
    background: var(--primary-color);
    transform: scale(1.1);
}

/* Combinations Grid */
.combinations-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

/* Rating Modal */
.rating-stars {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    margin: var(--spacing-lg) 0;
}

.star-btn {
    background: none;
    border: none;
    font-size: 2rem;
    cursor: pointer;
    transition: transform var(--transition-fast);
    opacity: 0.3;
}

.star-btn:hover,
.star-btn.active {
    transform: scale(1.2);
    opacity: 1;
}

.rating-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
}

.btn-primary,
.btn-secondary {
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-primary {
    background: var(--primary-color);
    color: var(--text-white);
    border: none;
}

.btn-primary:hover:not(:disabled) {
    background: var(--primary-dark);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

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

/* Toast Notifications */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 2000;
}

.toast {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    box-shadow: var(--shadow-lg);
    min-width: 300px;
    animation: toastSlideIn 0.3s ease-out;
}

.toast.success {
    border-left: 4px solid var(--success-color);
}

.toast.error {
    border-left: 4px solid var(--error-color);
}

.toast.warning {
    border-left: 4px solid var(--warning-color);
}

.toast.info {
    border-left: 4px solid var(--info-color);
}

@keyframes toastSlideIn {
    from {
        opacity: 0;
        transform: translateX(100px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-desktop {
        display: none;
    }
    
    .bottom-nav {
        display: flex;
    }
    
    .main {
        padding-bottom: calc(var(--spacing-xl) + 80px);
    }
    
    .emoji-mixer {
        flex-direction: column;
        gap: var(--spacing-lg);
    }
    
    .plus-icon {
        transform: rotate(90deg);
    }
    
    .emoji-btn {
        width: 100px;
        height: 100px;
        font-size: 3rem;
    }
    
    .explore-grid,
    .saved-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
        gap: var(--spacing-md);
    }
    
    .saved-stats {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .saved-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .result-actions {
        flex-direction: column;
    }
    
    .categories {
        gap: var(--spacing-xs);
    }
    
    .category-btn {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: 0.9rem;
    }
    
    .daily-streak-card {
        padding: var(--spacing-md);
    }
    
    .streak-content {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .daily-emoji-section {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-sm);
    }
    
    .daily-emoji {
        font-size: 2.5rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .modal-content {
        width: 95vw;
        margin: var(--spacing-sm);
    }
    
    .emoji-grid {
        grid-template-columns: repeat(auto-fill, minmax(40px, 1fr));
    }
    
    .combinations-grid {
        grid-template-columns: 1fr;
    }
    
    .explore-grid,
    .saved-grid {
        grid-template-columns: 1fr;
    }
    
    .section h2 {
        font-size: 1.5rem;
    }
    
    .logo h1 {
        font-size: 1.25rem;
    }
}

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

.loading {
    opacity: 0.5;
    pointer-events: none;
}

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

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.mt-5 { margin-top: var(--spacing-xl); }

/* Animaciones adicionales */
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.pulse {
    animation: pulse 2s infinite;
}

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

.shake {
    animation: shake 0.5s ease-in-out;
}

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

::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
    border-radius: 4px;
}

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

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

/* Modo oscuro (opcional para futuras implementaciones) */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #0f172a;
        --bg-secondary: #1e293b;
        --bg-tertiary: #334155;
        --bg-card: #1e293b;
        --text-primary: #f1f5f9;
        --text-secondary: #cbd5e1;
        --text-muted: #64748b;
        --border-color: #334155;
    }
    
    .header {
        background: rgba(30, 41, 59, 0.95);
    }
    
    .bottom-nav {
        background: rgba(30, 41, 59, 0.95);
    }
}