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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 600px;
    margin: 0 auto;
}

/* Header y navegación */
.header {
    background: white;
    border-radius: 20px;
    padding: 20px;
    margin-bottom: 20px;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.logo {
    text-align: center;
    color: white;
    margin-bottom: 30px;
}

.logo h1 {
    font-size: 28px;
    margin-bottom: 10px;
}

/* Menú */
.menu {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
    background: white;
    padding: 15px;
    border-radius: 15px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.menu a {
    flex: 1;
    text-align: center;
    padding: 10px;
    background: #f0f0f0;
    color: #333;
    text-decoration: none;
    border-radius: 10px;
    font-size: 14px;
    transition: all 0.3s;
}

.menu a:hover, .menu a.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

/* Tarjetas de estadísticas */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
    margin-bottom: 20px;
}

.stat-card {
    background: white;
    padding: 20px;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.stat-icon {
    font-size: 30px;
    margin-bottom: 10px;
}

.stat-info h3 {
    font-size: 12px;
    color: #666;
    margin-bottom: 5px;
}

.stat-value {
    font-size: 24px;
    font-weight: bold;
    margin-top: 5px;
}

.stat-value.positive {
    color: #28a745;
}

.stat-value.negative {
    color: #dc3545;
}

/* Tarjetas generales */
.card {
    background: white;
    border-radius: 15px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.card h2 {
    margin-bottom: 20px;
    color: #333;
    font-size: 18px;
}

/* Formularios */
.form-group {
    margin-bottom: 15px;
}

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

label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
    color: #555;
    font-size: 14px;
}

input, select, textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 10px;
    font-size: 16px;
    font-family: inherit;
}

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

/* Botones */
.btn-primary, button[type="submit"] {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 12px 20px;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    width: 100%;
    font-size: 16px;
    font-weight: 600;
    transition: transform 0.2s;
}

.btn-primary:hover, button[type="submit"]:hover {
    transform: translateY(-2px);
}

.btn-secondary {
    background: #6c757d;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 10px;
    cursor: pointer;
}

/* Tablas */
.table-responsive {
    overflow-x: auto;
}

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

.data-table th {
    background: #f8f9fa;
    padding: 12px;
    text-align: left;
    font-size: 14px;
    font-weight: 600;
    color: #555;
}

.data-table td {
    padding: 12px;
    border-bottom: 1px solid #eee;
    font-size: 14px;
}

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

/* Alertas */
.alert {
    padding: 12px;
    border-radius: 10px;
    margin-bottom: 20px;
    font-size: 14px;
}

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

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

/* Info box */
.info-box {
    background: #e7f3ff;
    padding: 12px;
    border-radius: 10px;
    margin-bottom: 15px;
    font-size: 14px;
    color: #004085;
}

/* Tips list */
.tips-list {
    list-style: none;
    padding: 0;
}

.tips-list li {
    padding: 10px 0;
    border-bottom: 1px solid #eee;
    font-size: 14px;
}

/* Progress bar */
.progress-bar {
    background: #e0e0e0;
    border-radius: 10px;
    height: 20px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    transition: width 0.3s;
}

/* Login form */
.login-form {
    background: white;
    padding: 30px;
    border-radius: 20px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

/* Responsive */
@media (max-width: 480px) {
    body {
        padding: 10px;
    }
    
    .form-row {
        grid-template-columns: 1fr;
        gap: 0;
    }
    
    .menu a {
        font-size: 12px;
        padding: 8px;
    }
    
    .stat-value {
        font-size: 20px;
    }
    
    .data-table th, .data-table td {
        padding: 8px;
        font-size: 12px;
    }
}