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

:root {
    --primary: #1e3a5f;
    --primary-light: #2d5a87;
    --secondary: #64748b;
    --accent: #0ea5e9;
    --success: #059669;
    --warning: #d97706;
    --danger: #dc2626;
    --bg: #f8fafc;
    --card: #ffffff;
    --border: #e2e8f0;
    --text: #1e293b;
    --text-light: #64748b;
    --shadow: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 24px;
}

header {
    background: var(--primary);
    color: white;
    padding: 20px 24px;
    border-radius: 8px;
    margin-bottom: 24px;
    box-shadow: var(--shadow-md);
}

header h1 {
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: -0.025em;
}

nav {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.nav-btn {
    padding: 10px 18px;
    border: 1px solid rgba(255,255,255,0.2);
    background: transparent;
    color: rgba(255,255,255,0.85);
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.2s;
}

.nav-btn:hover {
    background: rgba(255,255,255,0.1);
    color: white;
}

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

.section {
    display: none;
    background: var(--card);
    padding: 24px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

.section.active {
    display: block;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
    flex-wrap: wrap;
    gap: 12px;
}

.section-header h2 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text);
}

.header-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.filter-box {
    background: #f1f5f9;
    padding: 16px;
    border-radius: 6px;
    margin-bottom: 16px;
    border: 1px solid var(--border);
}

.filter-box h4 {
    margin: 0 0 12px 0;
    color: var(--text);
    font-size: 0.875rem;
    font-weight: 600;
}

.filter-form {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    align-items: center;
}

.filter-form select {
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    min-width: 140px;
    font-size: 0.875rem;
    background: white;
}

.btn-secondary {
    background: var(--secondary);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    transition: background 0.2s;
}

.btn-secondary:hover {
    background: #475569;
}

.btn-primary {
    background: var(--primary);
    color: white;
    border: none;
    padding: 10px 18px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    transition: background 0.2s;
}

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

.btn-success {
    background: var(--success);
    color: white;
    border: none;
    padding: 10px 18px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    transition: background 0.2s;
}

.btn-success:hover {
    background: #047857;
}

.btn-warning {
    background: var(--warning);
    color: white;
    border: none;
    padding: 10px 18px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    transition: background 0.2s;
}

.btn-warning:hover {
    background: #b45309;
}

.btn-danger {
    background: var(--danger);
    color: white;
    border: none;
    padding: 6px 12px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.75rem;
    font-weight: 500;
    transition: background 0.2s;
}

.btn-danger:hover {
    background: #b91c1c;
}

.btn-edit {
    background: var(--accent);
    color: white;
    border: none;
    padding: 6px 12px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.75rem;
    font-weight: 500;
    margin-right: 6px;
    transition: background 0.2s;
}

.btn-edit:hover {
    background: #0284c7;
}

.search-box {
    margin-bottom: 16px;
}

.search-box input {
    width: 100%;
    max-width: 320px;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.875rem;
    transition: border-color 0.2s;
}

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

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border);
    font-size: 0.875rem;
}

th {
    background: #f8fafc;
    font-weight: 600;
    color: var(--text);
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
}

tr:hover {
    background: #f8fafc;
}

tfoot td, tfoot th {
    background: var(--primary);
    color: white;
    font-weight: 600;
}

.entrada-rapida, .salida-rapida {
    background: #f0fdf4;
    padding: 16px;
    border-radius: 6px;
    margin-bottom: 20px;
    border: 1px solid #bbf7d0;
}

.salida-rapida {
    background: #fffbeb;
    border-color: #fde68a;
}

.form-row {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    align-items: center;
}

.form-row select, .form-row input {
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: 6px;
    min-width: 150px;
    font-size: 0.875rem;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(4px);
}

.modal-content {
    background: white;
    margin: 8% auto;
    padding: 28px;
    border-radius: 12px;
    width: 90%;
    max-width: 480px;
    position: relative;
    box-shadow: 0 20px 40px rgba(0,0,0,0.2);
}

.modal-content h2 {
    font-size: 1.25rem;
    margin-bottom: 20px;
    color: var(--text);
}

.close {
    position: absolute;
    right: 20px;
    top: 16px;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-light);
    transition: color 0.2s;
}

.close:hover {
    color: var(--text);
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
    font-size: 0.875rem;
    color: var(--text);
}

.form-group input, .form-group select {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.875rem;
    transition: border-color 0.2s;
}

.form-group input:focus, .form-group select:focus {
    outline: none;
    border-color: var(--accent);
}

/* Reportes */
.filtros-reporte {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
    align-items: center;
}

.filtros-reporte select {
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.875rem;
    background: white;
}

.reporte-contenido {
    background: #fafafa;
    padding: 24px;
    border-radius: 8px;
    border: 1px solid var(--border);
}

.reporte-header {
    text-align: center;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 2px solid var(--primary);
}

.reporte-header h3 {
    font-size: 1.125rem;
    color: var(--text);
}

.report-period {
    font-size: 1.25rem;
    color: var(--primary);
    font-weight: 600;
    margin: 10px 0;
}

.no-data {
    text-align: center;
    padding: 48px;
    color: var(--text-light);
}

.reporte-categoria {
    margin-bottom: 24px;
}

.reporte-categoria h4 {
    background: var(--primary);
    color: white;
    padding: 12px 16px;
    border-radius: 6px 6px 0 0;
    font-size: 0.875rem;
    font-weight: 600;
}

.reporte-categoria table {
    border: 1px solid var(--border);
    border-top: none;
}

.reporte-totales {
    margin-top: 32px;
    padding-top: 24px;
    border-top: 2px solid var(--text);
}

.reporte-totales h4 {
    margin-bottom: 16px;
    font-size: 1rem;
}

#tablaResumen tfoot td, #tablaResumen tfoot th {
    background: var(--primary);
    color: white;
}

.stock-bajo {
    color: var(--danger);
    font-weight: 600;
}

/* Header with user info */
.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    flex-wrap: wrap;
    gap: 12px;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.user-info span {
    background: rgba(255,255,255,0.15);
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 0.875rem;
}

.btn-link {
    color: white;
    text-decoration: none;
    padding: 8px 16px;
    background: rgba(255,255,255,0.15);
    border-radius: 6px;
    font-size: 0.875rem;
    transition: background 0.2s;
}

.btn-link:hover {
    background: rgba(255,255,255,0.25);
}

.btn-logout {
    color: white;
    text-decoration: none;
    padding: 8px 16px;
    background: var(--danger);
    border-radius: 6px;
    font-size: 0.875rem;
    transition: background 0.2s;
}

.btn-logout:hover {
    background: #b91c1c;
}

/* Alerts */
.alert {
    padding: 14px 18px;
    border-radius: 6px;
    margin-bottom: 20px;
    font-size: 0.875rem;
}

.alert-success {
    background: #f0fdf4;
    color: #166534;
    border: 1px solid #bbf7d0;
}

.alert-error {
    background: #fef2f2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

/* Badges */
.badge {
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

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

.badge-user {
    background: var(--secondary);
    color: white;
}

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

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

/* Form checkbox */
.form-group input[type="checkbox"] {
    width: auto;
    margin-right: 8px;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 16px;
    }
    
    .form-row {
        flex-direction: column;
    }
    
    .form-row select, .form-row input {
        width: 100%;
    }
    
    th, td {
        padding: 10px 12px;
        font-size: 0.8125rem;
    }
    
    .section-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .header-actions {
        width: 100%;
    }
    
    .header-actions button {
        flex: 1;
    }
}

@media print {
    header, nav, .filtros-reporte, .btn-primary, .btn-success, .header-actions {
        display: none !important;
    }
    
    .section {
        display: block !important;
        box-shadow: none;
        border: none;
    }
    
    #reportes {
        display: block !important;
    }
    
    body {
        background: white;
    }
}