:root {
    --va-bg: #020617;
    --va-card-bg: #0f172a;
    --va-border: #1e293b;
    --va-primary: #22c55e;
    --va-primary-soft: rgba(34,197,94,0.15);
    --va-text: #e5e7eb;
    --va-muted: #9ca3af;
    --va-danger: #f97373;
    --va-radius: 1rem;
    --va-shadow: 0 18px 45px rgba(15,23,42,0.9);
    --va-font: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

body.va-body {
    margin: 0;
    min-height: 100vh;
    background: radial-gradient(circle at top, #0f172a 0, #020617 55%, #000 100%);
    color: var(--va-text);
    font-family: var(--va-font);
    display: flex;
    align-items: center;
    justify-content: center;
}

.va-container {
    width: 100%;
    max-width: 480px;
    padding: 1.5rem;
}

h1, h2 {
    margin: 0 0 0.75rem;
    font-weight: 600;
}

.va-buttons {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin: 1.5rem 0;
}

.va-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1rem;
    border-radius: 999px;
    border: 1px solid var(--va-primary);
    background: var(--va-primary-soft);
    color: var(--va-text);
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.15s ease-out;
}

.va-btn:hover {
    background: var(--va-primary);
    color: #020617;
    transform: translateY(-1px);
    box-shadow: 0 10px 30px rgba(34,197,94,0.3);
}

.va-note {
    font-size: 0.8rem;
    color: var(--va-muted);
}

.va-card {
    background: var(--va-card-bg);
    border-radius: var(--va-radius);
    border: 1px solid var(--va-border);
    padding: 1rem 1.1rem;
    margin-top: 1rem;
    box-shadow: var(--va-shadow);
}

.va-log {
    background: #020617;
    border-radius: 0.75rem;
    padding: 0.75rem;
    margin-top: 0.75rem;
    font-size: 0.75rem;
    max-height: 200px;
    overflow: auto;
}

/* Pantalla de optotipos */
body.va-pantalla {
    background: #000;
    color: #fff;
}

.va-pantalla-main {
    width: 100%;
    height: 100vh;
    display: flex;
    flex-direction: column;
}

.va-optotype-container {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.va-optotype-text {
    font-size: 96px;
    letter-spacing: 0.25em;
    font-weight: 700;
}

.va-pantalla-footer {
    padding: 0.75rem;
    text-align: center;
    background: rgba(15,23,42,0.85);
}