/* ========================================
   Variables CSS para temas claro y oscuro
   ======================================== */

:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --text-muted: #adb5bd;
    --border-color: #dee2e6;
    --shadow: rgba(0, 0, 0, 0.1);
    --shadow-hover: rgba(0, 0, 0, 0.15);
    
    --primary: #007bff;
    --primary-hover: #0056b3;
    --success: #28a745;
    --danger: #dc3545;
    --warning: #ffc107;
    --info: #17a2b8;
    
    --header-height: 70px;
    --container-max: 1200px;
    --border-radius: 8px;
    --transition: 0.3s ease;
}

[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-tertiary: #3a3a3a;
    --text-primary: #f8f9fa;
    --text-secondary: #adb5bd;
    --text-muted: #6c757d;
    --border-color: #404040;
    --shadow: rgba(0, 0, 0, 0.3);
    --shadow-hover: rgba(0, 0, 0, 0.5);
}

/* ========================================
   Reset y estilos base
   ======================================== */

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color var(--transition), color var(--transition);
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color var(--transition);
}

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

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ========================================
   Contenedor
   ======================================== */

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 20px;
}

/* ========================================
   Header
   ======================================== */

.site-header {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    height: var(--header-height);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 4px var(--shadow);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: var(--header-height);
}

.site-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--text-primary);
}

.logo-icon {
    font-size: 2rem;
}

.header-nav {
    display: flex;
    align-items: center;
    gap: 20px;
}

.nav-link {
    color: var(--text-primary);
    padding: 8px 16px;
    border-radius: var(--border-radius);
    transition: background-color var(--transition);
}

.nav-link:hover {
    background-color: var(--bg-tertiary);
}

.theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.5rem;
    padding: 8px;
    border-radius: 50%;
    transition: background-color var(--transition);
}

.theme-toggle:hover {
    background-color: var(--bg-tertiary);
}

[data-theme="dark"] .theme-icon-light {
    display: none;
}

[data-theme="light"] .theme-icon-dark,
:root:not([data-theme]) .theme-icon-dark {
    display: none;
}

/* Menú de usuario */
.user-menu {
    position: relative;
}

.user-menu-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: 8px 16px;
    border-radius: var(--border-radius);
    transition: background-color var(--transition);
}

.user-menu-toggle:hover {
    background-color: var(--bg-tertiary);
}

.user-icon {
    font-size: 1.2rem;
}

.user-menu-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 8px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 12px var(--shadow);
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition);
}

.user-menu-dropdown.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    display: block;
    padding: 12px 20px;
    color: var(--text-primary);
    transition: background-color var(--transition);
}

.dropdown-item:hover {
    background-color: var(--bg-tertiary);
}

.dropdown-divider {
    height: 1px;
    background-color: var(--border-color);
    margin: 8px 0;
}

/* ========================================
   Footer
   ======================================== */

.site-footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 30px 0;
    margin-top: 60px;
    text-align: center;
}

.footer-content {
    color: var(--text-secondary);
}

.footer-credits {
    margin-top: 10px;
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* ========================================
   Main Content
   ======================================== */

main {
    min-height: calc(100vh - var(--header-height) - 200px);
    padding: 40px 0;
}

.page-header {
    margin-bottom: 40px;
    text-align: center;
}

.page-header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.lead {
    font-size: 1.2rem;
    color: var(--text-secondary);
}

/* ========================================
   Búsqueda
   ======================================== */

.search-box {
    margin-bottom: 40px;
}

.search-form {
    display: flex;
    gap: 10px;
    max-width: 600px;
    margin: 0 auto;
}

.search-input {
    flex: 1;
    padding: 12px 20px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 1rem;
}

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

/* ========================================
   Botones
   ======================================== */

.btn {
    display: inline-block;
    padding: 10px 20px;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    text-align: center;
    transition: all var(--transition);
    text-decoration: none;
}

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

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

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

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

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

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

.btn-sm {
    padding: 6px 12px;
    font-size: 0.875rem;
}

.btn-block {
    display: block;
    width: 100%;
}

/* ========================================
   Álbumes Grid
   ======================================== */

.albums-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.album-card {
    background-color: var(--bg-secondary);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: 0 2px 8px var(--shadow);
    transition: transform var(--transition), box-shadow var(--transition);
}

.album-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 16px var(--shadow-hover);
}

.album-link {
    display: block;
    color: inherit;
}

.album-thumbnail {
    position: relative;
    width: 100%;
    padding-top: 66.67%; /* Ratio 3:2 */
    overflow: hidden;
    background-color: var(--bg-tertiary);
}

.album-thumbnail img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.no-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 1.2rem;
}

.album-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.7), transparent);
    padding: 20px;
    color: white;
}

.photo-count {
    font-size: 0.9rem;
    font-weight: 500;
}

.album-info {
    padding: 20px;
}

.album-title {
    font-size: 1.3rem;
    margin-bottom: 10px;
}

.album-description {
    color: var(--text-secondary);
    margin-bottom: 10px;
    font-size: 0.95rem;
}

.album-meta {
    display: flex;
    gap: 15px;
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* ========================================
   Fotos Grid
   ======================================== */

.photos-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.photo-item {
    position: relative;
    cursor: pointer;
    border-radius: var(--border-radius);
    overflow: hidden;
    background-color: var(--bg-secondary);
    box-shadow: 0 2px 8px var(--shadow);
    transition: transform var(--transition), box-shadow var(--transition);
}

.photo-item:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 16px var(--shadow-hover);
}

.photo-thumbnail {
    width: 100%;
    height: 250px;
    object-fit: cover;
}

.photo-caption {
    padding: 10px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-align: center;
}

/* ========================================
   Lightbox
   ======================================== */

.lightbox {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.95);
    z-index: 9999;
    align-items: center;
    justify-content: center;
}

.lightbox.active {
    display: flex;
}

.lightbox-content {
    max-width: 90%;
    max-height: 90%;
    position: relative;
}

#lightbox-image {
    max-width: 100%;
    max-height: 80vh;
    object-fit: contain;
}

.lightbox-caption {
    color: white;
    text-align: center;
    padding: 15px;
    font-size: 1rem;
    line-height: 1.6;
    max-width: 800px;
    margin: 0 auto;
}

.lightbox-caption strong {
    font-size: 1.2rem;
    display: block;
    margin-bottom: 8px;
}

.lightbox-counter {
    color: white;
    text-align: center;
    padding: 10px;
    font-size: 0.9rem;
    opacity: 0.8;
}

.lightbox-close,
.lightbox-prev,
.lightbox-next,
.lightbox-download {
    position: absolute;
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    font-size: 2rem;
    cursor: pointer;
    padding: 15px 20px;
    transition: background-color var(--transition);
    border-radius: var(--border-radius);
    text-decoration: none;
    display: flex;
    align-items: center;
    justify-content: center;
}

.lightbox-close:hover,
.lightbox-prev:hover,
.lightbox-next:hover,
.lightbox-download:hover {
    background: rgba(255, 255, 255, 0.3);
}

.lightbox-close {
    top: 20px;
    right: 20px;
}

.lightbox-download {
    top: 20px;
    right: 90px;
    font-size: 1rem;
    padding: 10px 12px;
}

.lightbox-download svg {
    width: 24px;
    height: 24px;
}

.lightbox-prev {
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
}

.lightbox-next {
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
}

/* ========================================
   Alertas
   ======================================== */

.alert {
    padding: 15px 20px;
    border-radius: var(--border-radius);
    margin-bottom: 20px;
}

.alert-success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.alert-warning {
    background-color: #fff3cd;
    color: #856404;
    border: 1px solid #ffeaa7;
}

.alert-info {
    background-color: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}

[data-theme="dark"] .alert-success {
    background-color: #1e4620;
    color: #a3d9a5;
    border-color: #2d5f2e;
}

[data-theme="dark"] .alert-error {
    background-color: #4a1c1c;
    color: #f5a3a3;
    border-color: #6b2929;
}

/* ========================================
   Estados vacíos
   ======================================== */

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

.empty-state p {
    font-size: 1.1rem;
    margin-bottom: 20px;
}

/* ========================================
   Formularios
   ======================================== */

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-primary);
}

.form-control {
    width: 100%;
    padding: 10px 15px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 1rem;
    transition: border-color var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
}

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

.form-help {
    display: block;
    margin-top: 5px;
    font-size: 0.875rem;
    color: var(--text-muted);
}

.checkbox-group label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}

/* ========================================
   Login
   ======================================== */

.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: calc(100vh - var(--header-height) - 200px);
}

.login-box {
    background-color: var(--bg-secondary);
    padding: 40px;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 16px var(--shadow);
    max-width: 400px;
    width: 100%;
}

.login-box h1 {
    text-align: center;
    margin-bottom: 30px;
}

.login-footer {
    text-align: center;
    margin-top: 20px;
}

/* ========================================
   Badges
   ======================================== */

.badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 500;
}

.badge-publico,
.badge-success {
    background-color: #d4edda;
    color: #155724;
}

.badge-privado,
.badge-private {
    background-color: #fff3cd;
    color: #856404;
}

.badge-danger {
    background-color: #f8d7da;
    color: #721c24;
}

[data-theme="dark"] .badge-publico,
[data-theme="dark"] .badge-success {
    background-color: #1e4620;
    color: #a3d9a5;
}

[data-theme="dark"] .badge-privado,
[data-theme="dark"] .badge-private {
    background-color: #4a3c0f;
    color: #ffd966;
}

/* ========================================
   Responsive
   ======================================== */

@media (max-width: 768px) {
    .albums-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
        gap: 20px;
    }
    
    .photos-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: 15px;
    }
    
    .header-nav {
        gap: 10px;
    }
    
    .nav-link {
        padding: 6px 12px;
        font-size: 0.9rem;
    }
    
    .user-name {
        display: none;
    }
    
    .page-header h1 {
        font-size: 2rem;
    }
    
    .lightbox-prev,
    .lightbox-next {
        padding: 10px 15px;
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .albums-grid,
    .photos-grid {
        grid-template-columns: 1fr;
    }
    
    .search-form {
        flex-direction: column;
    }
}