/* Variables de color (Tema Premium Oscuro) */
:root {
    --bg-negro: #080808;
    --bg-gris-oscuro: #121212;
    --bg-tarjeta: #1a1a1a;
    --rojo-principal: #e60000;
    --rojo-hover: #b30000;
    --texto-blanco: #f5f5f5;
    --texto-gris: #a0a0a0;
    --borde-oscuro: #333333;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-negro);
    color: var(--texto-blanco);
    line-height: 1.6;
}

/* Tipografías para títulos */
h1, h2, h3, .logo {
    font-family: 'Montserrat', sans-serif;
    text-transform: uppercase;
}

.text-rojo { color: var(--rojo-principal); }
.text-center { text-align: center; }

/* --- NAVEGACIÓN --- */
header {
    background-color: rgba(8, 8, 8, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--borde-oscuro);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 5%;
    max-width: 1400px;
    margin: 0 auto;
}

.logo {
    font-size: 28px;
    font-weight: 900;
    letter-spacing: 2px;
}

.logo span { color: var(--rojo-principal); }

.nav-links {
    list-style: none;
    display: flex;
    gap: 30px;
}

.nav-links a {
    color: var(--texto-blanco);
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    letter-spacing: 1px;
    transition: color 0.3s;
}

.nav-links a:hover { color: var(--rojo-principal); }

/* --- HERO SECTION --- */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    /* Imagen de fondo de auto deportivo oscuro */
    background: url('https://images.unsplash.com/photo-1611821064430-0d4022cb4efe?q=80&w=2000&auto=format&fit=crop') center/cover no-repeat;
}

.hero-overlay {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: linear-gradient(to right, rgba(0,0,0,0.9) 0%, rgba(0,0,0,0.6) 100%);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: left;
    max-width: 800px;
    padding: 0 5%;
    margin-right: auto;
}

.hero-content h1 {
    font-size: 4.5rem;
    line-height: 1.1;
    font-weight: 900;
    margin-bottom: 20px;
}

.hero-content p {
    font-size: 1.2rem;
    color: var(--texto-gris);
    margin-bottom: 40px;
    max-width: 600px;
}

/* --- SECCIONES GENERALES --- */
.seccion { padding: 100px 5%; }
.bg-oscuro { background-color: var(--bg-gris-oscuro); }
.bg-textura { background-color: var(--bg-negro); }
.bg-footer { background-color: #050505; border-top: 1px solid var(--borde-oscuro); }

.contenedor { max-width: 1200px; margin: 0 auto; }
.titulo-seccion { font-size: 2.5rem; font-weight: 900; margin-bottom: 50px; }

/* --- TARJETAS DE SERVICIOS --- */
.grid-servicios {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.tarjeta-servicio {
    background: var(--bg-tarjeta);
    padding: 40px 30px;
    border-radius: 8px;
    border: 1px solid var(--borde-oscuro);
    transition: transform 0.3s, border-color 0.3s;
}

.tarjeta-servicio:hover {
    transform: translateY(-10px);
    border-color: var(--rojo-principal);
}

.tarjeta-servicio h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--texto-blanco);
}

.tarjeta-servicio p { color: var(--texto-gris); }

/* --- FORMULARIO PREMIUM (EL CORE) --- */
.repro-header { max-width: 700px; margin: 0 auto 50px auto; }
.repro-header p { color: var(--texto-gris); font-size: 1.1rem; }

.formulario-contenedor {
    background: var(--bg-tarjeta);
    padding: 50px;
    border-radius: 12px;
    border: 1px solid var(--borde-oscuro);
    box-shadow: 0 20px 50px rgba(0,0,0,0.5);
    max-width: 900px;
    margin: 0 auto;
}

.grid-form {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 25px;
}

.grupo-form { display: flex; flex-direction: column; }

.grupo-form label {
    margin-bottom: 8px;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--texto-gris);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Inputs oscuros */
select, input[type="file"] {
    background-color: var(--bg-negro);
    color: var(--texto-blanco);
    padding: 15px;
    border: 1px solid var(--borde-oscuro);
    border-radius: 6px;
    font-size: 1rem;
    font-family: 'Inter', sans-serif;
    outline: none;
    transition: border-color 0.3s, box-shadow 0.3s;
    appearance: none; /* Quita la flecha fea por defecto en algunos navegadores */
}

select:focus {
    border-color: var(--rojo-principal);
    box-shadow: 0 0 10px rgba(230, 0, 0, 0.2);
}

select:disabled { opacity: 0.5; cursor: not-allowed; }

/* Caja de Modificaciones (Checkboxes) */
.contenedor-mods-wrapper {
    background: rgba(230, 0, 0, 0.05);
    border: 1px dashed var(--rojo-principal);
    padding: 25px;
    border-radius: 8px;
    margin-bottom: 25px;
}

.label-destacado { color: var(--rojo-principal) !important; font-weight: 900 !important; }

.lista-mods {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-top: 15px;
}

/* Checkboxes personalizados que inserta JS */
.lista-mods label {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--texto-blanco);
    text-transform: none;
    font-size: 1.1rem;
    background: var(--bg-negro);
    padding: 15px;
    border-radius: 6px;
    border: 1px solid var(--borde-oscuro);
    cursor: pointer;
    transition: border-color 0.2s;
}

.lista-mods label:hover { border-color: var(--rojo-principal); }

/* Caja de subida de archivo */
.upload-box { margin-bottom: 30px; }
.upload-box input[type="file"] { padding: 20px; border: 1px dashed #666; width: 100%; cursor: pointer; }

/* --- BOTONES --- */
.btn-principal {
    background-color: var(--rojo-principal);
    color: white;
    padding: 16px 30px;
    border: none;
    border-radius: 4px;
    font-size: 1.1rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.2s;
    text-decoration: none;
    display: inline-block;
}

.btn-principal:hover {
    background-color: var(--rojo-hover);
    transform: translateY(-2px);
}

.btn-principal:disabled { background-color: #444; color: #888; cursor: not-allowed; transform: none; }
.btn-block { width: 100%; padding: 20px; font-size: 1.2rem; }

/* --- MENSAJES DE ESTADO --- */
.mensaje-status { margin-top: 20px; text-align: center; font-weight: 600; font-size: 1.1rem; padding: 15px; border-radius: 6px; }

/* Contacto */
.correo-contacto { font-size: 2rem; font-weight: 900; color: var(--rojo-principal); margin-top: 10px; }

/* --- RESPONSIVE --- */
@media (max-width: 768px) {
    .hero-content h1 { font-size: 3rem; }
    .grid-form, .lista-mods { grid-template-columns: 1fr; }
    .nav-links { display: none; /* Aquí podrías añadir un menú hamburguesa en el futuro */ }
    .formulario-contenedor { padding: 30px 20px; }
}
/* --- SECCIÓN CURSOS HOME (3 COLUMNAS) --- */
.seccion-cursos-home {
    background-color: var(--bg-negro);
    padding: 80px 5%;
}

.grid-cursos-home {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    max-width: 1200px;
    margin: 50px auto 0 auto;
}

.columna-curso {
    display: flex;
    flex-direction: column;
}

.tarjeta-curso-img {
    position: relative;
    height: 350px;
    border-radius: 16px;
    overflow: hidden;
    background-size: cover;
    background-position: center;
    box-shadow: 0 15px 35px rgba(0,0,0,0.5);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    cursor: pointer;
}

.tarjeta-curso-img:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(230, 0, 0, 0.2);
}

.overlay-curso {
    position: absolute;
    bottom: 0; left: 0; width: 100%; height: 100%;
    /* Degradado para que el texto sea legible siempre */
    background: linear-gradient(to top, rgba(0,0,0,0.95) 0%, rgba(0,0,0,0.1) 100%);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 25px;
}

.etiqueta-paso {
    align-self: flex-start;
    background: var(--rojo-principal);
    color: #fff;
    font-weight: 900;
    padding: 5px 12px;
    border-radius: 4px;
    font-size: 0.9rem;
    text-transform: uppercase;
}

.titulo-portada {
    color: #fff;
    font-family: 'Montserrat', sans-serif;
    font-size: 1.6rem;
    line-height: 1.1;
    text-align: right;
    margin: 0;
}

.subtitulo-abajo {
    text-align: center;
    color: var(--texto-gris);
    font-size: 1rem;
    font-weight: 600;
    margin-top: 20px;
    padding: 0 10px;
    line-height: 1.4;
}

/* Responsivo para celulares (se pone en 1 sola columna) */
@media (max-width: 900px) {
    .grid-cursos-home { grid-template-columns: 1fr; }
}