/* ==================== RESET Y VARIABLES ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #2563eb;
    --primary-dark: #1e40af;
    --secondary: #64748b;
    --success: #10b981;
    --error: #ef4444;
    --warning: #f59e0b;
    
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    
    --border: #e2e8f0;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    
    --radius: 8px;
    --radius-lg: 12px;
    --spacing: 1rem;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* ==================== NAVBAR ==================== */
.navbar {
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border);
    padding: 1rem 0;
    box-shadow: var(--shadow);
}

.navbar-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.navbar-icon {
    width: 28px;
    height: 28px;
    color: var(--primary);
}

.navbar-user {
    display: flex;
    align-items: center;
    gap: 1rem;
}

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

.btn-logout {
    padding: 0.5rem 1rem;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    text-decoration: none;
    font-size: 0.9rem;
    transition: all 0.2s;
}

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

/* ==================== MAIN CONTENT ==================== */
.main-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

.container {
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow);
}

.container.drag-over {
    border: 2px dashed var(--primary);
    background-color: var(--bg-secondary);
}

/* ==================== HEADER SECTION ==================== */
.header-section {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.page-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
}

.header-actions {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

/* ==================== BUTTONS ==================== */
.btn-primary, .btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    border: none;
    border-radius: var(--radius);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

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

.btn-block {
    width: 100%;
    justify-content: center;
}

.btn-primary svg, .btn-secondary svg {
    width: 18px;
    height: 18px;
}

.btn-icon {
    padding: 0.5rem;
    background: none;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    color: var(--text-secondary);
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.btn-icon.btn-delete:hover {
    background-color: #fee;
    color: var(--error);
}

.btn-icon svg {
    width: 18px;
    height: 18px;
}

/* ==================== SEARCH ==================== */
.search-section {
    margin-bottom: 1.5rem;
}

.search-input {
    width: 100%;
    padding: 0.875rem 1.25rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.95rem;
    transition: all 0.2s;
}

.search-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* ==================== FILTROS ==================== */
.filters-container {
    margin-bottom: 1.5rem;
}

.filter-label {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    font-size: 0.95rem;
}

.filter-buttons {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.filter-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 1rem;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s;
}

.filter-btn svg {
    width: 16px;
    height: 16px;
}

.filter-btn:hover {
    background-color: var(--bg-tertiary);
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-1px);
}

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

.filter-btn.active:hover {
    background-color: var(--primary-dark);
}

/* ==================== CONTROLES DE BÚSQUEDA ==================== */
.search-controls {
    display: flex;
    gap: 1rem;
    align-items: center;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.sort-controls {
    display: flex;
    gap: 0.75rem;
    align-items: center;
    flex-wrap: wrap;
}

.sort-controls label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.sort-controls select,
#per-page-select {
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.9rem;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s;
}

.sort-controls select:focus,
#per-page-select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.search-controls .search-input {
    flex: 1;
    min-width: 200px;
}

/* ==================== INFORMACIÓN DE RESULTADOS ==================== */
.results-info {
    padding: 0.75rem 1rem;
    background-color: var(--bg-secondary);
    border-radius: var(--radius);
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 1rem;
}

/* ==================== PAGINACIÓN ==================== */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.pagination-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 1rem;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.9rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s;
}

.pagination-btn svg {
    width: 16px;
    height: 16px;
}

.pagination-btn:not(.disabled):hover {
    background-color: var(--primary);
    color: white;
    border-color: var(--primary);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.pagination-btn.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

.pagination-numbers {
    display: flex;
    gap: 0.25rem;
    align-items: center;
}

.pagination-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 36px;
    padding: 0.5rem;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s;
}

.pagination-number:hover {
    background-color: var(--bg-secondary);
    border-color: var(--primary);
    color: var(--primary);
}

.pagination-number.active {
    background-color: var(--primary);
    color: white;
    border-color: var(--primary);
}

.pagination-number.active:hover {
    background-color: var(--primary-dark);
}

.pagination-ellipsis {
    padding: 0 0.5rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* ==================== FILES GRID ==================== */
.files-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.25rem;
}

.file-card {
    display: flex;
    flex-direction: column;
    background-color: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    transition: all 0.2s;
    cursor: pointer;
}

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

.file-icon {
    width: 100%;
    height: 140px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-secondary);
    border-radius: var(--radius);
    margin-bottom: 1rem;
    overflow: hidden;
}

.file-icon svg {
    width: 48px;
    height: 48px;
    color: var(--secondary);
}

.file-thumbnail {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.file-info {
    flex: 1;
    margin-bottom: 1rem;
}

.file-name {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.file-meta {
    display: flex;
    gap: 1rem;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.file-actions {
    display: flex;
    gap: 0.25rem;
    justify-content: space-between;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}

/* ==================== EMPTY STATE ==================== */
.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 4rem 2rem;
}

.empty-state svg {
    width: 80px;
    height: 80px;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}

.empty-state h2 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.empty-state p {
    color: var(--text-secondary);
}

/* ==================== LOGIN ==================== */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.login-card {
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 3rem;
    width: 100%;
    max-width: 420px;
    box-shadow: var(--shadow-lg);
}

.login-header {
    text-align: center;
    margin-bottom: 2rem;
}

.login-icon {
    width: 48px;
    height: 48px;
    color: var(--primary);
    margin: 0 auto 1rem;
}

.login-header h1 {
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
}

.login-header p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.form-group input {
    padding: 0.875rem 1.25rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.95rem;
    transition: all 0.2s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* ==================== ALERTS ==================== */
.flash-messages {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    max-width: 400px;
}

.alert {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.25rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.alert-success {
    background-color: #d1fae5;
    color: #065f46;
    border: 1px solid #6ee7b7;
}

.alert-error {
    background-color: #fee2e2;
    color: #991b1b;
    border: 1px solid #fca5a5;
}

.alert-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: inherit;
    opacity: 0.6;
    transition: opacity 0.2s;
    margin-left: 1rem;
}

.alert-close:hover {
    opacity: 1;
}

/* ==================== MODAL ==================== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background-color: var(--bg-primary);
    padding: 2rem;
    border-radius: var(--radius-lg);
    max-width: 500px;
    width: 90%;
    text-align: center;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background-color: var(--bg-secondary);
    border-radius: 4px;
    overflow: hidden;
    margin: 1.5rem 0;
}

.progress-fill {
    height: 100%;
    background-color: var(--primary);
    border-radius: 4px;
    transition: width 0.3s;
    width: 0%;
    animation: progress 2s infinite;
}

@keyframes progress {
    0% { width: 0%; }
    50% { width: 70%; }
    100% { width: 100%; }
}

/* ==================== ERROR PAGE ==================== */
.error-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.error-card {
    text-align: center;
    max-width: 500px;
}

.error-code {
    font-size: 6rem;
    font-weight: 700;
    color: var(--primary);
    line-height: 1;
    margin-bottom: 1rem;
}

.error-card h1 {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 768px) {
    .main-content {
        padding: 1rem;
    }
    
    .container {
        padding: 1.25rem;
    }
    
    .header-section {
        flex-direction: column;
        align-items: stretch;
    }
    
    .header-actions {
        flex-direction: column;
    }
    
    .files-grid {
        grid-template-columns: 1fr;
    }
    
    .navbar-container {
        padding: 0 1rem;
    }
    
    .navbar-brand span {
        display: none;
    }
    
    .login-card {
        padding: 2rem;
    }
    
    /* Filtros responsive */
    .filter-buttons {
        gap: 0.375rem;
    }
    
    .filter-btn {
        padding: 0.5rem 0.75rem;
        font-size: 0.8rem;
    }
    
    .filter-btn svg {
        width: 14px;
        height: 14px;
    }
    
    /* Controles de búsqueda responsive */
    .search-controls {
        flex-direction: column;
        align-items: stretch;
    }
    
    .sort-controls {
        justify-content: space-between;
    }
    
    /* Paginación responsive */
    .pagination {
        gap: 0.375rem;
    }
    
    .pagination-btn {
        padding: 0.5rem 0.75rem;
        font-size: 0.8rem;
    }
    
    .pagination-number {
        min-width: 32px;
        height: 32px;
        font-size: 0.8rem;
    }
}