:root {
    --bg-dark: #050505;
    --text-pure: #ffffff;
    --text-muted: #888888;
    --border-fine: rgba(255, 255, 255, 0.1);
    --font-sans: 'Inter', sans-serif;
    --font-display: 'Syne', sans-serif;
    --ease-cinematic: cubic-bezier(0.16, 1, 0.3, 1);
}

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

body {
    background-color: var(--bg-dark);
    color: var(--text-pure);
    font-family: var(--font-sans);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

.selector-stage {
    width: 100%;
    max-width: 1100px;
    padding: 4rem 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.micro-brand {
    font-size: 0.65rem;
    letter-spacing: 0.4em;
    color: var(--text-muted);
    display: block;
    margin-bottom: 1rem;
}

.main-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 0.5rem;
}

.subtitle {
    color: var(--text-muted);
    font-size: 0.95rem;
    font-weight: 300;
    margin-bottom: 5rem;
}

/* Grilla de Opciones de Círculos */
.options-container {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 3rem;
    width: 100%;
    margin-bottom: 5rem;
}

.option-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: var(--text-pure);
    transition: transform 0.5s var(--ease-cinematic);
}

.option-card:hover {
    transform: translateY(-8px);
}

.circle-preview {
    width: 140px;
    height: 140px;
    border-radius: 50%;
    border: 1px solid var(--border-fine);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 2rem;
    transition: all 0.5s var(--ease-cinematic);
    position: relative;
}

.version-num {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
}

/* Diseños diferenciados de los círculos */
.v1-preview { background: radial-gradient(circle, #1a1a1a 0%, #050505 100%); }
.v2-preview { background: #ffffff; color: #000; border-color: #ffffff; }
.v3-preview { background: linear-gradient(135deg, #111111 0%, #333333 100%); }

.option-card:hover .circle-preview {
    box-shadow: 0 0 30px rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.8);
    transform: scale(1.05);
}

.option-info h3 {
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    margin-bottom: 0.5rem;
}

.option-info p {
    font-size: 0.8rem;
    color: var(--text-muted);
    line-height: 1.5;
    font-weight: 300;
}

.btn-back {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.75rem;
    letter-spacing: 0.2em;
    transition: color 0.3s ease;
}

.btn-back:hover { color: var(--text-pure); }

@media (max-width: 850px) {
    .options-container { grid-template-columns: 1fr; gap: 4rem; }
}