/* Reset y configuración base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Colores principales */
    --primary-color: #3b82f6;
    --primary-dark: #2563eb;
    --primary-light: #60a5fa;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
    
    /* Colores de fondo */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-dark: #1e293b;
    
    /* Colores de texto */
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --text-white: #ffffff;
    
    /* Bordes y sombras */
    --border-color: #e2e8f0;
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --border-radius-lg: 16px;
    --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);
    
    /* Espaciado */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Tipografía */
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    
    /* Transiciones */
    --transition-fast: 0.15s ease-in-out;
    --transition-normal: 0.3s ease-in-out;
    --transition-slow: 0.5s ease-in-out;
}

/* Configuración base del body */
body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    min-height: 100vh;
}

/* Navegación */
.navbar {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo a {
    color: var(--text-white);
    text-decoration: none;
    font-size: var(--font-size-xl);
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    transition: var(--transition-fast);
}

.nav-logo a:hover {
    transform: scale(1.05);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-link {
    color: var(--text-white);
    text-decoration: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-sm);
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.nav-link:hover {
    background-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.nav-user {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-white);
}

.nav-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid rgba(255, 255, 255, 0.3);
    transition: var(--transition-fast);
}

.nav-avatar:hover {
    border-color: var(--text-white);
    transform: scale(1.1);
}

.nav-username {
    font-weight: 600;
    font-size: var(--font-size-sm);
}

.nav-logout {
    color: var(--text-white);
    text-decoration: none;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    transition: var(--transition-fast);
    opacity: 0.8;
}

.nav-logout:hover {
    opacity: 1;
    background-color: rgba(255, 255, 255, 0.1);
}

/* Contenido principal */
.main-content {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
    min-height: calc(100vh - 140px);
}

/* Alertas */
.alert {
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    animation: slideInDown 0.3s ease-out;
}

.alert-success {
    background-color: #dcfce7;
    color: #166534;
    border: 1px solid #bbf7d0;
}

.alert-error {
    background-color: #fef2f2;
    color: #dc2626;
    border: 1px solid #fecaca;
}

.alert-warning {
    background-color: #fffbeb;
    color: #d97706;
    border: 1px solid #fed7aa;
}

.alert ul {
    list-style: none;
    margin: 0;
}

.alert li {
    margin-bottom: var(--spacing-xs);
}

/* Tarjetas */
.card {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: var(--transition-normal);
    border: 1px solid var(--border-color);
}

.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.card-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    background: linear-gradient(135deg, var(--bg-secondary), var(--bg-tertiary));
}

.card-header h3 {
    margin: 0;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.card-body {
    padding: var(--spacing-lg);
}

/* Formularios de autenticación */
.auth-container {
    min-height: calc(100vh - 140px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
}

.auth-card {
    background: var(--bg-primary);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
    padding: var(--spacing-2xl);
    width: 100%;
    max-width: 450px;
    border: 1px solid var(--border-color);
    animation: fadeInUp 0.5s ease-out;
}

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

.auth-header h1 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.auth-header p {
    color: var(--text-secondary);
    font-size: var(--font-size-lg);
}

/* Formularios */
.auth-form, .profile-form, .new-post-form, .comment-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

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

.form-group label {
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.form-group input,
.form-group textarea,
.form-group select {
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: var(--font-size-base);
    transition: var(--transition-fast);
    background-color: var(--bg-primary);
    color: var(--text-primary);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
    transform: translateY(-1px);
}

.form-group input:disabled {
    background-color: var(--bg-tertiary);
    color: var(--text-muted);
    cursor: not-allowed;
}

.form-group small {
    color: var(--text-muted);
    font-size: var(--font-size-sm);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

/* Botones */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--border-radius);
    font-size: var(--font-size-base);
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: var(--transition-normal);
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--text-white);
}

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

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

.btn-secondary:hover {
    background: #475569;
    transform: translateY(-2px);
}

.btn-success {
    background: var(--success-color);
    color: var(--text-white);
}

.btn-success:hover {
    background: #059669;
    transform: translateY(-2px);
}

.btn-full {
    width: 100%;
}

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

.btn-icon {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--border-radius-sm);
    transition: var(--transition-fast);
}

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

/* Enlaces de autenticación */
.auth-links {
    text-align: center;
    margin-top: var(--spacing-xl);
}

.auth-links p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.auth-links a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition-fast);
}

.auth-links a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

/* Perfil de usuario */
.profile-container {
    max-width: 900px;
    margin: 0 auto;
}

.profile-header {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--text-white);
    padding: var(--spacing-2xl);
    border-radius: var(--border-radius-lg);
    margin-bottom: var(--spacing-xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
}

.profile-photo-section {
    position: relative;
}

.profile-photo {
    position: relative;
    width: 150px;
    height: 150px;
    border-radius: 50%;
    overflow: hidden;
    border: 4px solid rgba(255, 255, 255, 0.3);
    transition: var(--transition-normal);
}

.profile-photo:hover {
    transform: scale(1.05);
    border-color: var(--text-white);
}

.profile-photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.photo-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition-fast);
}

.profile-photo:hover .photo-overlay {
    opacity: 1;
}

.profile-info h1 {
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-3xl);
}

.profile-info .username {
    font-size: var(--font-size-lg);
    opacity: 0.9;
    margin-bottom: var(--spacing-xs);
}

.profile-info .email {
    opacity: 0.8;
    margin-bottom: var(--spacing-xs);
}

.profile-info .join-date {
    opacity: 0.7;
    font-size: var(--font-size-sm);
}

/* Pestañas del perfil */
.profile-tabs {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
    border-bottom: 2px solid var(--border-color);
}

.tab-button {
    background: none;
    border: none;
    padding: var(--spacing-md) var(--spacing-lg);
    cursor: pointer;
    border-radius: var(--border-radius-sm) var(--border-radius-sm) 0 0;
    transition: var(--transition-fast);
    color: var(--text-secondary);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

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

.tab-button.active {
    background-color: var(--primary-color);
    color: var(--text-white);
    border-bottom: 2px solid var(--primary-color);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease-out;
}

/* Modal de cámara */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: var(--bg-primary);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    animation: modalSlideIn 0.3s ease-out;
}

.modal-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: linear-gradient(135deg, var(--bg-secondary), var(--bg-tertiary));
}

.modal-header h3 {
    margin: 0;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.modal-close {
    background: none;
    border: none;
    font-size: var(--font-size-xl);
    cursor: pointer;
    color: var(--text-muted);
    transition: var(--transition-fast);
    padding: var(--spacing-xs);
    border-radius: var(--border-radius-sm);
}

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

.modal-body {
    padding: var(--spacing-lg);
}

.camera-container {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.camera-container video,
.camera-container img {
    max-width: 100%;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
}

.camera-controls {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

/* Feed de publicaciones */
.home-container {
    max-width: 700px;
    margin: 0 auto;
}

.new-post-card {
    background: var(--bg-primary);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-xl);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.new-post-card .card-header {
    background: linear-gradient(135deg, var(--bg-secondary), var(--bg-tertiary));
}

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

.user-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--border-color);
    transition: var(--transition-fast);
}

.user-avatar:hover {
    border-color: var(--primary-color);
    transform: scale(1.05);
}

.user-avatar-sm {
    width: 35px;
    height: 35px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--border-color);
}

.user-info h4 {
    margin: 0;
    color: var(--text-primary);
    font-size: var(--font-size-lg);
}

.user-info .username {
    color: var(--text-muted);
    font-size: var(--font-size-sm);
}

.char-counter {
    text-align: right;
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
}

.post-actions {
    display: flex;
    justify-content: flex-end;
}

/* Tarjetas de publicaciones */
.posts-feed {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.post-card {
    background: var(--bg-primary);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    overflow: hidden;
    transition: var(--transition-normal);
}

.post-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.post-header {
    padding: var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.post-date {
    color: var(--text-muted);
    font-size: var(--font-size-sm);
    margin-left: var(--spacing-sm);
}

.post-content {
    padding: 0 var(--spacing-lg) var(--spacing-lg);
}

.post-content p {
    margin: 0;
    line-height: 1.6;
    color: var(--text-primary);
}

.post-footer {
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-secondary);
}

.post-stats {
    display: flex;
    gap: var(--spacing-lg);
}

.comment-count {
    color: var(--text-muted);
    font-size: var(--font-size-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.post-interactions {
    display: flex;
    gap: var(--spacing-sm);
}

/* Sección de comentarios */
.comments-section {
    border-top: 1px solid var(--border-color);
    background: var(--bg-tertiary);
}

.comments-list {
    max-height: 400px;
    overflow-y: auto;
    padding: var(--spacing-md);
}

.comment {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    border: 1px solid var(--border-color);
    transition: var(--transition-fast);
}

.comment:hover {
    box-shadow: var(--shadow-sm);
}

/* .comment-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-sm);
}

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

.comment-info h5 {
    margin: 0;
    font-size: var(--font-size-sm);
    color: var(--text-primary);
}

.comment-info .username {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
} */

.comment-date {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
}

.comment-content p {
    margin: 0;
    font-size: var(--font-size-sm);
    line-height: 1.5;
}

.new-comment {
    padding: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

.comment-input {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.comment-input textarea {
    flex: 1;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-sm);
    resize: none;
    font-size: var(--font-size-sm);
}

.no-comments {
    text-align: center;
    color: var(--text-muted);
    font-style: italic;
    padding: var(--spacing-lg);
}

/* Feed vacío */
.empty-feed {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--text-muted);
}

.empty-feed i {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-lg);
    color: var(--text-muted);
}

.empty-feed h3 {
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
}

/* Footer */
.footer {
    background: var(--bg-dark);
    color: var(--text-white);
    text-align: center;
    padding: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
}

.footer p {
    margin: 0;
    opacity: 0.8;
}

.footer p:first-child {
    margin-bottom: var(--spacing-sm);
}

/* Animaciones */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: scale(0.9) translateY(-50px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-container {
        padding: 0 var(--spacing-md);
        flex-wrap: wrap;
        height: auto;
        min-height: 70px;
    }
    
    .nav-menu {
        gap: var(--spacing-md);
        flex-wrap: wrap;
    }
    
    .nav-user {
        flex-direction: column;
        gap: var(--spacing-xs);
        text-align: center;
    }
    
    .main-content {
        padding: var(--spacing-lg) var(--spacing-md);
    }
    
    .auth-card {
        padding: var(--spacing-xl);
        margin: var(--spacing-md);
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .profile-header {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-lg);
    }
    
    .profile-photo {
        width: 120px;
        height: 120px;
    }
    
    .profile-tabs {
        flex-wrap: wrap;
    }
    
    .tab-button {
        flex: 1;
        min-width: 120px;
    }
    
    .post-header {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .post-footer {
        flex-direction: column;
        gap: var(--spacing-sm);
        align-items: flex-start;
    }
    
    .camera-controls {
        flex-direction: column;
        align-items: center;
    }
    
    .comment-input {
        flex-direction: column;
    }
    
    .modal-content {
        width: 95%;
        margin: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .nav-logo a {
        font-size: var(--font-size-lg);
    }
    
    .profile-info h1 {
        font-size: var(--font-size-2xl);
    }
    
    .auth-header h1 {
        font-size: var(--font-size-2xl);
    }
    
    .btn {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: var(--font-size-sm);
    }
    
    .user-avatar {
        width: 40px;
        height: 40px;
    }
    
    .profile-photo {
        width: 100px;
        height: 100px;
    }
}

/* Mejoras de accesibilidad */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Modo oscuro (preparado para futuras implementaciones) */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #1e293b;
        --bg-secondary: #0f172a;
        --bg-tertiary: #334155;
        --text-primary: #f8fafc;
        --text-secondary: #cbd5e1;
        --text-muted: #94a3b8;
        --border-color: #334155;
    }
}

/* Estados de focus mejorados para accesibilidad */
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible,
a:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

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

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

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

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