:root {
    --corp-blue: #0747a6;
    --corp-green: #00a389;
    --corp-red: #ff5252;
    --corp-yellow: #ffab00;
    --bg-body: #f8fafc;
    --text-dark: #1e293b;
    --card-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.04);
}

body {
    font-family: 'Plus Jakarta Sans', sans-serif;
    background-color: var(--bg-body);
    color: var(--text-dark);
    margin: 0;
    min-height: 100vh;
}

/* --- NAVBAR SUPERIOR --- */
.navbar-main {
    background-color: var(--corp-blue);
    padding: 1rem 0;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.4rem;
    color: white !important;
    display: flex;
    align-items: center;
    gap: 10px;
}

/* --- CABECERA --- */
.page-header {
    text-align: center;
    padding: 4rem 0 2rem;
}

.page-header h1 {
    font-weight: 800;
    font-size: 2.5rem;
    color: var(--text-dark);
}

/* --- GRID DE SISTEMAS --- */
.systems-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
    padding: 2rem 0 5rem;
}

.system-card {
    background: white;
    border-radius: 20px;
    padding: 2.5rem 2rem;
    border: 1px solid rgba(0,0,0,0.05);
    box-shadow: var(--card-shadow);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    text-align: center;
    position: relative;
    overflow: hidden;
}

/* Efecto de borde superior dinámico */
.system-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 0; /* Oculto por defecto */
    transition: height 0.3s ease;
}

/* Colores específicos para el borde superior al pasar el mouse */
.card-blue:hover::before { background-color: var(--corp-blue); height: 6px; }
.card-green:hover::before { background-color: var(--corp-green); height: 6px; }
.card-yellow:hover::before { background-color: var(--corp-yellow); height: 6px; }
.card-red:hover::before { background-color: var(--corp-red); height: 6px; }

.system-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 30px rgba(0, 0, 0, 0.08);
    border-color: transparent;
}

.icon-container {
    width: 72px;
    height: 72px;
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem auto;
    transition: transform 0.3s;
}

.system-card:hover .icon-container {
    transform: scale(1.1);
}

.system-card h3 {
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 0.8rem;
}

.system-card p {
    font-size: 1rem;
    color: #64748b;
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.btn-access {
    background: #f1f5f9;
    color: var(--text-dark);
    padding: 0.7rem;
    border-radius: 12px;
    font-weight: 600;
    transition: all 0.2s;
    margin-top: auto;
}

/* Colores de iconos */
.c-blue { background-color: rgba(7, 71, 166, 0.08); color: var(--corp-blue); }
.c-green { background-color: rgba(0, 163, 137, 0.08); color: var(--corp-green); }
.c-red { background-color: rgba(255, 82, 82, 0.08); color: var(--corp-red); }
.c-yellow { background-color: rgba(255, 171, 0, 0.08); color: var(--corp-yellow); }

/* Cambio de color del botón al hover */
.card-blue:hover .btn-access { background: var(--corp-blue); color: white; }
.card-green:hover .btn-access { background: var(--corp-green); color: white; }
.card-red:hover .btn-access { background: var(--corp-red); color: white; }
.card-yellow:hover .btn-access { background: var(--corp-yellow); color: white; }