:root {
    --robotiax-red: #800000; /* Rojo profundo para el fondo */
    --ia-accent: #ff3333;
    --card-light: #f5f5f5;
    --text-white: #ffffff;
    --text-black: #000000;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    background-color: var(--robotiax-red);
    color: var(--text-white);
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    overflow-x: hidden;
}

.main-container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 60px 20px;
}

/* BOTÓN DE ESCAPE FIJO Y PEQUEÑO */
.back-link {
    position: fixed; 
    top: 15px; 
    left: 15px; 
    color: var(--text-white);
    text-decoration: none; 
    font-family: 'Orbitron'; 
    font-size: 0.6rem;
    z-index: 2000;
    background: rgba(0,0,0,0.5);
    padding: 8px 15px;
    border: 1px solid var(--text-white);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.back-link:hover {
    background: var(--text-white);
    color: var(--text-black);
}

/* BOTÓN ARSENAL COMPLETO CON ANIMACIÓN */
.btn-arsenal-link {
    display: inline-block;
    padding: 20px 40px;
    background: var(--text-white);
    color: var(--robotiax-red);
    font-family: 'Orbitron';
    font-weight: 900;
    text-decoration: none;
    border-radius: 4px;
    margin-top: 20px;
    font-size: 1.1rem;
    text-transform: uppercase;
    box-shadow: 0 0 20px rgba(255,255,255,0.3);
    animation: pulseButton 2s infinite;
    transition: 0.3s;
}

.btn-arsenal-link:hover {
    transform: scale(1.05);
    box-shadow: 0 0 40px rgba(255,255,255,0.6);
    background: #ffffff;
    color: #ff0000;
}

@keyframes pulseButton {
    0% { transform: scale(1); box-shadow: 0 0 10px rgba(255,255,255,0.3); }
    50% { transform: scale(1.03); box-shadow: 0 0 30px rgba(255,255,255,0.6); }
    100% { transform: scale(1); box-shadow: 0 0 10px rgba(255,255,255,0.3); }
}

.arsenal-subtitle {
    display: block;
    font-family: 'Rajdhani';
    font-size: 1.4rem;
    color: #ffffff;
    margin-bottom: 10px;
    font-weight: 700;
    letter-spacing: 2px;
}

header {
    text-align: center;
    margin-bottom: 50px;
    padding-top: 20px;
}

h1 {
    font-family: 'Orbitron', sans-serif;
    font-size: clamp(2rem, 8vw, 3rem);
    font-weight: 900;
    letter-spacing: 2px;
    color: var(--text-white);
    text-transform: uppercase;
}

.sub-header {
    color: #ff9999; /* Rojo claro para que se lea sobre el fondo rojo */
    font-family: 'Orbitron';
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 4px;
}

.modules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 25px;
}

/* MÓDULOS GRIS HUESO */
.black-module {
    background: var(--card-light);
    border: none;
    padding: 35px;
    border-radius: 4px;
    display: flex;
    flex-direction: column;
    box-shadow: 0 15px 35px rgba(0,0,0,0.3);
}

.module-title {
    font-family: 'Orbitron', sans-serif;
    font-size: 1.1rem;
    color: var(--robotiax-red);
    margin-bottom: 15px;
    font-weight: 800;
}

.module-desc {
    color: var(--text-black);
    font-size: 0.95rem;
    font-weight: 500;
    margin-bottom: 25px;
    min-height: 4em;
}

.module-price {
    font-family: 'Inter', sans-serif;
    font-weight: 900;
    font-size: 2rem;
    color: var(--text-black);
    margin-bottom: 25px;
}

/* BOTÓN DE COMPRA: BLANCO CON LETRAS ROJAS */
.btn-module-purchase {
    background: #ffffff;
    color: var(--robotiax-red);
    border: 2px solid var(--robotiax-red);
    padding: 15px;
    font-family: 'Orbitron', sans-serif;
    font-size: 0.8rem;
    font-weight: 900;
    cursor: pointer;
    text-transform: uppercase;
    transition: 0.3s;
    text-align: center;
}

.btn-module-purchase:hover {
    background: var(--robotiax-red);
    color: #ffffff;
}

/* MÓDULO MAESTRO RED ORBIT */
.promo-container {
    margin-top: 80px;
    background: var(--card-light);
    border: 4px solid var(--text-white);
    padding: 50px 30px;
    text-align: center;
    box-shadow: 0 20px 50px rgba(0,0,0,0.5);
    border-radius: 8px;
}

.promo-title {
    font-family: 'Orbitron';
    color: var(--robotiax-red);
    font-size: 2rem;
    margin-bottom: 15px;
}

.promo-desc {
    color: var(--text-black);
    max-width: 700px;
    margin: 0 auto 25px;
    font-weight: 600;
}

.promo-price {
    font-family: 'Orbitron';
    font-size: 3rem;
    color: var(--text-black);
    margin-bottom: 30px;
    display: block;
}