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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
.header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.header h1 {
    font-size: 28px;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 15px;
}

/* Login Page */
.login-page {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
}

.login-box {
    background: white;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
}

.login-box h1 {
    text-align: center;
    color: #667eea;
    margin-bottom: 30px;
    font-size: 32px;
}

/* Navigation Menu */
.nav-menu {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.nav-item {
    background: white;
    padding: 30px;
    border-radius: 8px;
    text-decoration: none;
    color: #333;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    transition: transform 0.2s, box-shadow 0.2s;
}

.nav-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.15);
}

.nav-item h3 {
    color: #667eea;
    margin-bottom: 10px;
    font-size: 24px;
}

.nav-item p {
    color: #666;
}

/* Forms */
.form-section {
    background: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    margin-bottom: 30px;
}

.form-section h2 {
    color: #667eea;
    margin-bottom: 20px;
    font-size: 24px;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #555;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 5px;
    font-size: 16px;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #667eea;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.form-col {
    display: flex;
    flex-direction: column;
}

.required {
    color: #e74c3c;
}

.radio-group {
    display: flex;
    gap: 20px;
    margin-top: 10px;
}

.radio-group label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: normal;
    cursor: pointer;
}

.radio-group input[type="radio"] {
    width: auto;
    cursor: pointer;
}

.checkbox-group {
    display: flex;
    gap: 20px;
    margin-top: 10px;
    flex-wrap: wrap;
}

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

.checkbox-group input[type="checkbox"] {
    width: auto;
    cursor: pointer;
}

/* Buttons */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    transition: background-color 0.3s, transform 0.2s;
    font-weight: 600;
}

.btn-primary {
    background-color: #667eea;
    color: white;
}

.btn-primary:hover {
    background-color: #5568d3;
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: #28a745;
    color: white;
    box-shadow: 0 2px 5px rgba(40, 167, 69, 0.3);
}

.btn-secondary:hover {
    background-color: #218838;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(40, 167, 69, 0.4);
}

.btn-info {
    background-color: #17a2b8;
    color: white;
}

.btn-danger {
    background-color: #dc3545;
    color: white;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 14px;
}

.btn-large {
    padding: 15px 30px;
    font-size: 18px;
}

/* Alerts */
.alert {
    padding: 15px;
    border-radius: 5px;
    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;
}

/* Tables */
.table-section {
    background: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.table-section h2 {
    color: #667eea;
    margin-bottom: 20px;
    font-size: 24px;
}

.table-container {
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
}

.data-table thead {
    background-color: #667eea;
    color: white;
}

.data-table th,
.data-table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid #e0e0e0;
}

.data-table tbody tr:hover {
    background-color: #f8f9fa;
}

.text-center {
    text-align: center;
}

/* Content Grid */
.content-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}

@media (max-width: 968px) {
    .content-grid {
        grid-template-columns: 1fr;
    }
}

/* Venta Form */
.venta-form {
    background: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

/* Abono Form */
.abono-form {
    background: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.info-box {
    background-color: #e7f3ff;
    border-left: 4px solid #667eea;
    padding: 15px;
    margin: 15px 0;
    border-radius: 5px;
}

.info-box h3 {
    margin-bottom: 10px;
    color: #667eea;
}

.info-box p {
    margin: 5px 0;
}

.estado-saldado {
    color: #28a745;
    font-weight: bold;
}

.estado-debe {
    color: #dc3545;
    font-weight: bold;
}

.estado-saldo-a-favor {
    color: #ffc107;
    font-weight: bold;
}

/* Reports */
.reports-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.report-card {
    background: white;
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.report-card h2 {
    color: #667eea;
    margin-bottom: 20px;
    font-size: 20px;
    border-bottom: 2px solid #667eea;
    padding-bottom: 10px;
}

.stat-item {
    display: flex;
    justify-content: space-between;
    padding: 10px 0;
    border-bottom: 1px solid #e0e0e0;
}

.stat-item:last-child {
    border-bottom: none;
}

.stat-label {
    font-weight: 600;
    color: #555;
}

.stat-value {
    color: #667eea;
    font-weight: bold;
    font-size: 18px;
}

/* Badges */
.badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
}

.badge-venta {
    background-color: #667eea;
    color: white;
}

.badge-abono {
    background-color: #28a745;
    color: white;
}

/* Responsive */
@media (max-width: 768px) {
    .header {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .nav-menu {
        grid-template-columns: 1fr;
    }
}