:root {
    --primary-blue: #003B70;
    --secondary-green: #006729;
    --accent-orange: #F37021;
    --bg-light: #F4F7F6;
    --text-dark: #333333;
    --danger-red: #D32F2F;
    --white: #FFFFFF;
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; }

body { background-color: var(--bg-light); color: var(--text-dark); }

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

/* Navbar */
.navbar { background-color: var(--primary-blue); color: var(--white); padding: 1rem 0; box-shadow: 0 2px 5px rgba(0,0,0,0.1); }
.nav-content { display: flex; justify-content: space-between; align-items: center; }
.logo span { color: var(--accent-orange); }
.nav-links { list-style: none; display: flex; gap: 20px; }
.nav-links a { color: var(--white); text-decoration: none; font-weight: bold; transition: 0.3s; }
.nav-links a:hover { color: var(--accent-orange); }

/* Layout */
.header-section { margin: 30px 0; text-align: center; }
.grid-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 20px; }
.operations-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; margin-top: 20px; }

/* Cards */
.card { background: var(--white); padding: 20px; border-radius: 8px; box-shadow: 0 4px 6px rgba(0,0,0,0.05); border-top: 4px solid var(--primary-blue); }
.bank-card h3 { color: var(--primary-blue); }
.balance { font-size: 1.5rem; font-weight: bold; color: var(--secondary-green); margin-top: 10px; }

.cash-card { border-top: 4px solid var(--secondary-green); text-align: center; margin-bottom: 20px;}
.balance-large { font-size: 2.5rem; font-weight: bold; color: var(--secondary-green); margin-top: 10px; }

/* Forms */
.form-group { margin-bottom: 15px; }
.form-group label { display: block; margin-bottom: 5px; font-weight: 500; }
.form-group select, .form-group input { width: 100%; padding: 10px; border: 1px solid #ccc; border-radius: 4px; font-size: 1rem; }
.btn { padding: 10px 15px; border: none; border-radius: 4px; cursor: pointer; font-size: 1rem; font-weight: bold; width: 100%; color: var(--white); transition: 0.3s; }
.btn-primary { background-color: var(--primary-blue); }
.btn-primary:hover { background-color: #002855; }
.btn-success { background-color: var(--secondary-green); }
.btn-success:hover { background-color: #004d1e; }

/* Alerts */
.alert { padding: 15px; margin-bottom: 20px; border-radius: 4px; font-weight: bold; }
.alert-danger { background-color: #ffebee; color: var(--danger-red); border-left: 5px solid var(--danger-red); }
.alert-success { background-color: #e8f5e9; color: var(--secondary-green); border-left: 5px solid var(--secondary-green); }

@media (max-width: 768px) {
    .operations-grid { grid-template-columns: 1fr; }
}

/* Login */
.login-body { display: flex; justify-content: center; align-items: center; height: 100vh; background-color: var(--primary-blue); }
.login-card { width: 100%; max-width: 400px; }

/* Tabla estilo Excel */
.excel-table { width: 100%; border-collapse: collapse; font-family: 'Segoe UI', sans-serif; font-size: 0.9rem; }
.excel-table th, .excel-table td { border: 1px solid #d4d4d4; padding: 8px 12px; text-align: left; }
.excel-table th { background-color: #f0f0f0; border-bottom: 2px solid #ccc; font-weight: bold; color: #333; }
.excel-table tr:nth-child(even) { background-color: #fafafa; }
.excel-table tr:hover { background-color: #e8f4ff; }