/* ============================================
   MENU PRINCIPAL -
   ============================================ */
* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    width: 100vw;
    height: 100vh;
    overflow-y: auto;
    overflow-x: hidden;
    font-family: 'Segoe UI', Arial, sans-serif;
    background: #050a18;
    color: #fff;
}

/* === FONDO === */
.menu-bg {
    min-height: 100vh;
    background: radial-gradient(ellipse at 50% 30%, #0d1b3e 0%, #050a18 70%);
    position: relative;
}

#bg-canvas {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    pointer-events: none;
    z-index: 0;
}

/* === CONTENEDOR === */
.menu-container {
    position: relative;
    z-index: 1;
    max-width: 1100px;
    margin: 0 auto;
    padding: 40px 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
}

/* === HEADER === */
.menu-header {
    text-align: center;
    margin-bottom: 50px;
}

.menu-title {
    font-size: 42px;
    font-weight: 700;
    color: #fff;
    text-shadow: 0 0 30px rgba(52, 152, 219, 0.5),
                 0 0 60px rgba(52, 152, 219, 0.2);
    margin-bottom: 10px;
    letter-spacing: 1px;
}

.menu-subtitle {
    font-size: 18px;
    color: rgba(255,255,255,0.5);
    letter-spacing: 2px;
    text-transform: uppercase;
}

/* === GRID DE TARJETAS === */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    width: 100%;
    margin-bottom: 50px;
}

/* === TARJETA BASE === */
.card {
    position: relative;
    background: rgba(255,255,255,0.04);
    border: 2px solid rgba(255,255,255,0.1);
    border-radius: 20px;
    padding: 35px 25px 25px;
    text-decoration: none;
    color: #fff;
    transition: all 0.3s ease;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    cursor: pointer;
}

.card:hover {
    transform: translateY(-6px);
    border-color: rgba(52, 152, 219, 0.5);
    background: rgba(52, 152, 219, 0.08);
    box-shadow: 0 15px 40px rgba(52, 152, 219, 0.15);
}

.card:active {
    transform: translateY(-2px);
}

/* Letra grande de fondo */
.card-letter {
    position: absolute;
    top: -10px;
    right: 15px;
    font-size: 100px;
    font-weight: 900;
    color: rgba(255,255,255,0.04);
    pointer-events: none;
    line-height: 1;
}

/* Icono grande */
.card-icon {
    font-size: 50px;
    margin-bottom: 15px;
}

.card-title {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 10px;
}

.card-desc {
    font-size: 14px;
    color: rgba(255,255,255,0.6);
    line-height: 1.6;
    margin-bottom: 18px;
    flex-grow: 1;
}

/* Tags */
.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 18px;
}

.tag {
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.15);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    color: rgba(255,255,255,0.7);
}

/* Boton de accion */
.card-action {
    font-size: 16px;
    font-weight: 600;
    color: #3498db;
    text-align: center;
    padding: 10px;
    border-radius: 12px;
    background: rgba(52, 152, 219, 0.1);
    border: 1px solid rgba(52, 152, 219, 0.3);
    transition: all 0.2s;
}

.card:hover .card-action {
    background: rgba(52, 152, 219, 0.2);
    border-color: rgba(52, 152, 219, 0.5);
}

.card-action-disabled {
    color: rgba(255,255,255,0.3);
    background: rgba(255,255,255,0.03);
    border-color: rgba(255,255,255,0.1);
}

/* === COLORES POR TARJETA === */
.card-eco:hover { border-color: rgba(46, 204, 113, 0.5); box-shadow: 0 15px 40px rgba(46, 204, 113, 0.15); }
.card-eco .card-action { color: #2ecc71; background: rgba(46, 204, 113, 0.1); border-color: rgba(46, 204, 113, 0.3); }
.card-eco:hover .card-action { background: rgba(46, 204, 113, 0.2); border-color: rgba(46, 204, 113, 0.5); }

.card-agua:hover { border-color: rgba(52, 152, 219, 0.5); box-shadow: 0 15px 40px rgba(52, 152, 219, 0.15); }

.card-coming { cursor: default; opacity: 0.5; }
.card-coming:hover { transform: none; border-color: rgba(255,255,255,0.1); background: rgba(255,255,255,0.04); box-shadow: none; }

/* === COLOR TARJETA MICROSCOPIO === */
.card-micro:hover { border-color: rgba(200,150,255,0.5); box-shadow: 0 15px 40px rgba(200,150,255,0.15); }
.card-micro .card-action { color: #c89eff; background: rgba(200,150,255,0.1); border-color: rgba(200,150,255,0.3); }
.card-micro:hover .card-action { background: rgba(200,150,255,0.2); border-color: rgba(200,150,255,0.5); }

/* === FOOTER === */
.menu-footer {
    text-align: center;
    padding: 20px;
    color: rgba(255,255,255,0.3);
    font-size: 13px;
    letter-spacing: 1px;
}

/* === RESPONSIVE === */
@media (max-width: 700px) {
    .menu-title { font-size: 28px; }
    .menu-subtitle { font-size: 14px; }
    .cards-grid { grid-template-columns: 1fr; gap: 20px; }
    .card { padding: 25px 20px 20px; }
    .card-icon { font-size: 36px; }
    .card-letter { font-size: 70px; }
}