/* ============================================
   Pikit - Sistema de Asignación de Actividades
   CSS Variables & Reset
   ============================================ */

:root {
    /* Colors - Pikit Brand */
    --primary: #23AAC5;
    --primary-dark: #1B8599;
    --primary-darker: #146170;
    --primary-light: #D1F0F7;
    --success: #059669;
    --success-light: #d1fae5;
    --danger: #dc2626;
    --danger-light: #fee2e2;
    --warning: #f59e0b;
    --warning-light: #fef3c7;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Shadows */
    --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);
    
    /* Transitions */
    --transition: all 0.2s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--gray-800);
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-darker) 100%);
    min-height: 100vh;
    padding: var(--spacing-lg);
}

/* ============================================
   Container & Layout
   ============================================ */

.container {
    max-width: 1000px;
    margin: 0 auto;
}

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

.header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    animation: fadeInDown 0.6s ease;
}

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

.logo-img {
    height: 60px;
    width: auto;
    object-fit: contain;
}

.logo-text {
    text-align: left;
}

.logo h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: white;
    margin: 0;
    margin-bottom: var(--spacing-xs);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.subtitle {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.9);
    font-weight: 400;
    margin: 0;
}

/* ============================================
   Card
   ============================================ */

.card {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-xl);
    animation: fadeInUp 0.6s ease;
}

.card h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.card h2 i {
    color: var(--primary);
    font-size: 1.75rem;
}

.card .description {
    color: var(--gray-600);
    margin-bottom: var(--spacing-xl);
    line-height: 1.7;
}

.card-error {
    border: 2px solid var(--danger);
}

/* ============================================
   Drop Zone
   ============================================ */

.drop-zone {
    border: 2px dashed var(--gray-300);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    background: var(--gray-50);
    margin-bottom: var(--spacing-lg);
}

.drop-zone:hover,
.drop-zone.drag-over {
    border-color: var(--primary);
    background: var(--primary-light);
}

.drop-zone-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.upload-icon {
    width: 64px;
    height: 64px;
    color: var(--primary);
}

.drop-text {
    font-size: 1.125rem;
    color: var(--gray-700);
}

.drop-text strong {
    color: var(--gray-900);
}

.drop-subtext {
    font-size: 0.875rem;
    color: var(--gray-500);
}

.file-types {
    display: inline-block;
    margin-top: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-md);
    background: white;
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    color: var(--gray-600);
    border: 1px solid var(--gray-200);
}

/* ============================================
   File Info
   ============================================ */

.file-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md);
    background: var(--success-light);
    border: 1px solid var(--success);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    animation: fadeIn 0.3s ease;
}

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

.file-icon {
    width: 40px;
    height: 40px;
    color: var(--success);
}

.file-name {
    font-weight: 600;
    color: var(--gray-900);
    font-size: 0.875rem;
}

.file-size {
    font-size: 0.75rem;
    color: var(--gray-600);
}

.btn-remove {
    background: transparent;
    border: none;
    color: var(--gray-500);
    font-size: 1.5rem;
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    transition: var(--transition);
    line-height: 1;
}

.btn-remove:hover {
    background: rgba(0, 0, 0, 0.05);
    color: var(--danger);
}

/* ============================================
   Progress Bar
   ============================================ */

.progress-container {
    margin-top: var(--spacing-lg);
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--gray-200);
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-bottom: var(--spacing-md);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--primary-dark));
    border-radius: var(--radius-lg);
    transition: width 0.3s ease;
    width: 0%;
    animation: pulse 2s infinite;
}

.progress-text {
    text-align: center;
    color: var(--gray-600);
    font-size: 0.875rem;
    font-weight: 500;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

/* ============================================
   Stats Grid
   ============================================ */

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.stat-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--gray-50);
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-200);
    transition: var(--transition);
}

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

.stat-icon {
    font-size: 2rem;
    color: var(--primary);
}

.stat-icon i {
    font-size: 2rem;
}

.stat-content {
    flex: 1;
}

.stat-label {
    font-size: 0.75rem;
    color: var(--gray-600);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-top: 0.25rem;
}

/* ============================================
   Table
   ============================================ */

.centers-table-container {
    margin-bottom: var(--spacing-xl);
}

.centers-table-container h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--spacing-md);
}

.centers-table {
    width: 100%;
    border-collapse: collapse;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.centers-table thead {
    background: var(--gray-100);
}

.centers-table th {
    padding: var(--spacing-md);
    text-align: left;
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--gray-700);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.centers-table td {
    padding: var(--spacing-md);
    border-top: 1px solid var(--gray-200);
    font-size: 0.875rem;
}

.centers-table tbody tr:hover {
    background: var(--gray-50);
}

.badge {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-warning {
    background: var(--warning-light);
    color: var(--warning);
}

/* ============================================
   Buttons
   ============================================ */

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

.btn {
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
}

.btn svg {
    width: 20px;
    height: 20px;
}

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

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

.btn-primary:hover:not(:disabled) {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn-success:hover:not(:disabled) {
    background: #047857;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--gray-200);
    color: var(--gray-700);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--gray-300);
}

.btn-lg {
    padding: var(--spacing-lg) var(--spacing-2xl);
    font-size: 1.125rem;
}

/* ============================================
   Error Message
   ============================================ */

.error-message {
    color: var(--danger);
    background: var(--danger-light);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    font-weight: 500;
}

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

.footer {
    text-align: center;
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-lg);
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.875rem;
}

/* ============================================
   Animations
   ============================================ */

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

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

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

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

@media (max-width: 768px) {
    body {
        padding: var(--spacing-md);
    }
    
    .logo {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .logo-img {
        height: 50px;
    }
    
    .logo-text {
        text-align: center;
    }
    
    .logo h1 {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 0.875rem;
    }
    
    .card {
        padding: var(--spacing-lg);
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .actions {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .centers-table {
        font-size: 0.75rem;
    }
    
    .centers-table th,
    .centers-table td {
        padding: var(--spacing-sm);
    }
}