:root {
    --bg: #0a0a0f;
    --card: #13131a;
    --border: rgba(255, 255, 255, 0.1);
    --text: #ffffff;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;
    --gradient: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem 1rem;
    position: relative;
    overflow-x: hidden;
}

.ambient {
    position: fixed;
    inset: 0;
    pointer-events: none;
    background:
        radial-gradient(circle at 20% 10%, rgba(79, 70, 229, 0.18), transparent 45%),
        radial-gradient(circle at 80% 85%, rgba(124, 58, 237, 0.16), transparent 45%);
}

.card {
    position: relative;
    width: 100%;
    max-width: 680px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 1.5rem;
    padding: 3.5rem 3rem;
    text-align: center;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
}

.logo {
    width: 220px;
    max-width: 70%;
    height: auto;
    margin: 0 auto 2rem;
    display: block;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 0.25rem;
}

.tagline {
    font-size: 0.8125rem;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.lead {
    color: var(--text-secondary);
    font-size: 1.0625rem;
    max-width: 46ch;
    margin: 0 auto 2.25rem;
}

.lead strong {
    color: var(--text);
    font-weight: 600;
}

.btn {
    display: inline-block;
    background: var(--gradient);
    color: var(--text);
    text-decoration: none;
    font-size: 1.0625rem;
    font-weight: 600;
    padding: 0.9rem 2.25rem;
    border-radius: 0.5rem;
    transition: transform 250ms ease, box-shadow 250ms ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(79, 70, 229, 0.45);
}

.details {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
    display: grid;
    grid-template-columns: max-content 1fr;
    gap: 0.75rem 2rem;
    text-align: left;
}

.details dt {
    color: var(--text-muted);
    font-size: 0.875rem;
    font-weight: 500;
}

.details dd {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

.details a {
    color: var(--text-secondary);
    text-decoration: none;
    border-bottom: 1px solid var(--border);
    transition: color 150ms ease, border-color 150ms ease;
}

.details a:hover {
    color: var(--text);
    border-bottom-color: rgba(255, 255, 255, 0.4);
}

.copyright {
    margin-top: 2.5rem;
    font-size: 0.8125rem;
    color: var(--text-muted);
}

@media (max-width: 640px) {
    .card { padding: 2.5rem 1.5rem; border-radius: 1rem; }
    h1 { font-size: 2rem; }
    .lead { font-size: 1rem; }
    .btn { display: block; }
    .details {
        grid-template-columns: 1fr;
        gap: 0.25rem;
    }
    .details dd { margin-bottom: 1rem; }
    .details dd:last-child { margin-bottom: 0; }
}

.reveal {
    font: inherit;
    font-size: 0.875rem;
    color: var(--text-secondary);
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 0.375rem;
    padding: 0.2rem 0.75rem;
    cursor: pointer;
    transition: color 150ms ease, border-color 150ms ease;
}

.reveal:hover:not(:disabled),
.reveal:focus-visible {
    color: var(--text);
    border-color: rgba(255, 255, 255, 0.4);
    outline: none;
}

.reveal:disabled { cursor: progress; opacity: 0.6; }

.reveal-error { color: var(--text-muted); font-size: 0.875rem; }

.note { margin-top: 1.5rem; font-size: 0.875rem; color: var(--text-muted); }