/* Variables */
:root {
    --primary: #0056b3;
    --secondary: #28a745;
    --bg: #f4f7f9;
    --white: #ffffff;
    --shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
}

/* Base */
html,
body {
    height: 100%;
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    font-family: 'Inter', sans-serif;
    background-color: var(--bg);
}

/* Header */
.navbar {
    background: var(--white);
    padding: 1rem 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.nav-container {
    flex: 1;
    display: flex;
    justify-content: center;
    /* Logo siempre al centro */
    align-items: center;
}

.logo img {
    height: 50px;
}

/* Contenedor Principal */
.container-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 4rem 1.5rem;
    /* Espaciado fijo arriba y abajo */
}

.welcome-section {
    text-align: center;
    margin-bottom: 3rem;
}

/* Tarjetas */
.card-container {
    display: flex;
    gap: 30px;
    flex-wrap: wrap;
    justify-content: center;
    width: 100%;
    max-width: 1000px;
}

.custom-card {
    background: var(--white);
    padding: 2.5rem;
    border-radius: 20px;
    text-align: center;
    text-decoration: none;
    color: inherit;
    min-width: 300px;
    max-width: 400px;
    box-shadow: var(--shadow);
    border-bottom: 8px solid var(--primary);
    transition: transform 0.3s ease;
}

main {
    flex: 1;
}

.custom-card:hover {
    transform: translateY(-5px);
}

.custom-card.secondary {
    border-bottom-color: var(--secondary);
}

.icon i {
    font-size: 3.5rem;
    color: var(--primary);
    margin-bottom: 1rem;
}

.secondary .icon i {
    color: var(--secondary);
}

/* Botones */
.btn-action {
    display: inline-block;
    margin-top: 1.5rem;
    padding: 0.8rem 2.5rem;
    background: var(--primary);
    color: white;
    border-radius: 50px;
    font-weight: 600;
}

.secondary .btn-action {
    background: var(--secondary);
}

footer {
    padding: 0.5rem;
    text-align: center;
    color: #888;
    border-top: 1px solid #eee;
    background: var(--white);
}