:root {
    --bg-main: #0b0f19;
    --bg-card: #111827;
    --bg-header: #070a12;
    --text-main: #e2e8f0;
    --text-muted: #94a3b8;
    --accent-blue: #38bdf8;
    --accent-indigo: #6366f1;
    --border-color: #1e293b;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

/* Evitar desbordamiento horizontal en móviles */
html, body {
    width: 100%;
    overflow-x: hidden;
}

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    line-height: 1.6;
}

/* Header & Nav */
header {
    background-color: var(--bg-header);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: #fff;
    letter-spacing: 1px;
}

.logo span {
    color: var(--accent-blue);
}

nav ul {
    display: flex;
    list-style: none;
    gap: 1.2rem;
    flex-wrap: wrap; /* Permite acomodar elementos si la pantalla se reduce */
}

nav a {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

nav a:hover, nav a.active {
    color: var(--accent-blue);
}

/* Main Container */
main {
    flex: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1rem;
    width: 100%;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 3rem 1rem;
    background: linear-gradient(180deg, rgba(56, 189, 248, 0.05) 0%, rgba(11, 15, 25, 0) 100%);
    border-radius: 12px;
    margin-bottom: 2rem;
}

.hero h1 {
    font-size: clamp(1.8rem, 4vw, 2.5rem); /* Tamaño adaptativo de fuente */
    margin-bottom: 1rem;
    color: #fff;
}

.hero p {
    font-size: clamp(1rem, 2vw, 1.2rem);
    color: var(--text-muted);
    max-width: 800px;
    margin: 0 auto 2rem auto;
}

.btn {
    display: inline-block;
    background-color: var(--accent-blue);
    color: #000;
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    transition: background-color 0.3s;
    text-align: center;
}

.btn:hover {
    background-color: #0284c7;
    color: #fff;
}

/* Cards & Grid Layouts */
.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    transition: transform 0.3s, border-color 0.3s;
    word-wrap: break-word; /* Previene desbordamiento de texto largo en móvil */
}

.card:hover {
    transform: translateY(-3px);
    border-color: var(--accent-blue);
}

.card h2, .card h3 {
    color: #fff;
    margin-bottom: 1rem;
    font-size: clamp(1.2rem, 3vw, 1.5rem);
}

.card h4 {
    color: var(--accent-blue);
    margin: 1.2rem 0 0.5rem 0;
}

.card p, .card ul {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.card ul {
    padding-left: 1.2rem;
}

/* Form Styles */
.form-group {
    margin-bottom: 1.2rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.4rem;
    color: #fff;
    font-size: 0.9rem;
}

.form-group input, 
.form-group textarea, 
.form-group select {
    width: 100%;
    padding: 0.75rem;
    background-color: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: #fff;
    font-size: 1rem;
}

.form-group input:focus, 
.form-group textarea:focus, 
.form-group select:focus {
    outline: none;
    border-color: var(--accent-blue);
}

/* Footer */
footer {
    background-color: var(--bg-header);
    border-top: 1px solid var(--border-color);
    text-align: center;
    padding: 1.5rem 1rem;
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* --- REGLAS RESPONSIVE (Móviles y Tablets) --- */
@media (max-width: 768px) {
    header {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
        padding: 1rem;
    }

    nav ul {
        justify-content: center;
        gap: 0.8rem;
    }

    nav a {
        font-size: 0.9rem;
    }

    main {
        padding: 1.5rem 0.8rem;
    }

    .hero {
        padding: 2rem 0.8rem;
    }

    .card {
        padding: 1.2rem;
    }
}