:root {
    --stark-white: #ffffff;
    --cold-blue: #004b93;
    --steel-grey: #6c757d;
    --ice-bg: #f4f6f9;
    --border-subtle: #e2e8f0;
}

body {
    background-color: var(--stark-white);
    /* Cuadrícula técnica animada muy sutil */
    background-image: 
        linear-gradient(rgba(0, 75, 147, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 75, 147, 0.04) 1px, transparent 1px);
    background-size: 40px 40px;
    animation: panGrid 20s linear infinite;
    color: #1e293b;
    font-family: 'Segoe UI', system-ui, sans-serif;
    min-height: 100vh;
}

@keyframes panGrid {
    0% { background-position: 0 0; }
    100% { background-position: 40px 40px; }
}

.corporate-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.04);
}

.module-card {
    background: #ffffff;
    border: 1px solid var(--border-subtle);
    border-radius: 10px;
    padding: 2rem;
    transition: all 0.3s cubic-bezier(0.25, 1, 0.5, 1);
    position: relative;
    overflow: hidden;
    text-decoration: none;
    display: block;
    color: inherit;
}

.module-card:hover {
    transform: translateY(-5px);
    border-color: var(--cold-blue);
    box-shadow: 0 15px 35px rgba(0, 75, 147, 0.1);
}

.module-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 4px; height: 100%;
    background: var(--steel-grey);
    transition: background 0.3s ease;
}

.module-card:hover::before {
    background: var(--cold-blue);
}

.btn-cold {
    background-color: var(--cold-blue);
    color: white;
    border: none;
    font-weight: 600;
    transition: background 0.3s;
}

.btn-cold:hover {
    background-color: #00366d;
    color: white;
}