:root {
    --bg: #0b0b0b;
    --surface: #121212;
    --surface-2: #1a1a1a;
    --border: #2a2a2a;
    --border-strong: #3a3a3a;

    --text: #d0d0d0;
    --text-muted: #8a8a8a;
    --text-dim: #666;
    --text-invert: #111;

    --accent: #ffffff;

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;

    --transition: 0.2s ease;
}

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

body {
    min-height: 100vh;
    background: radial-gradient(1200px 600px at top, #111 0%, var(--bg) 60%);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--text);
    line-height: 1.6;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
}

.container {
    width: 100%;
    max-width: 620px;
    background: var(--surface);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-lg);
    padding: 28px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.header {
    margin-bottom: 22px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
}

.logo {
    font-size: 20px;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 12px;
    letter-spacing: -0.01em;
}

.nav {
    display: flex;
    gap: 6px;
}

.nav-btn {
    appearance: none;
    background: transparent;
    border: 1px solid transparent;
    padding: 6px 12px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-muted);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background var(--transition), color var(--transition), border var(--transition);
}

.nav-btn:hover {
    background: var(--surface-2);
    color: var(--accent);
}

.nav-btn.active {
    background: var(--accent);
    color: var(--text-invert);
    border-color: var(--accent);
}

.section {
    display: none;
}

.section.active {
    display: block;
}

.section-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 14px;
}

.section-header h2 {
    font-size: 15px;
    font-weight: 600;
    color: var(--accent);
}

.badge {
    font-size: 11px;
    font-weight: 500;
    padding: 3px 8px;
    background: var(--accent);
    color: var(--text-invert);
    border-radius: 999px;
}

.card {
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 14px;
    margin-bottom: 10px;
}

.card h3 {
    font-size: 14px;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 6px;
}

.card p {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 10px;
}

.card ul {
    list-style: none;
}

.card li {
    padding: 6px 0;
    font-size: 13px;
    color: var(--text);
    border-bottom: 1px solid var(--border);
}

.card li:last-child {
    border-bottom: none;
}

.version-info {
    font-size: 12px;
    color: var(--text-dim);
}

.link-group {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 14px;
    font-size: 13px;
    font-weight: 500;
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: background var(--transition), color var(--transition), border var(--transition);
}

.btn-primary {
    background: var(--accent);
    color: var(--text-invert);
}

.btn-primary:hover {
    background: #e5e5e5;
}

.btn-secondary {
    background: var(--surface-2);
    color: var(--text);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: #222;
}

.archive-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.archive-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 12px;
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    text-decoration: none;
    color: var(--text);
    transition: background var(--transition), border var(--transition), transform var(--transition);
}

.archive-item:hover {
    background: #232323;
    border-color: var(--border-strong);
    transform: translateY(-1px);
}

.archive-item .version {
    font-size: 13px;
    font-weight: 500;
    color: var(--accent);
}

.archive-item .type {
    font-size: 11px;
    color: var(--text-muted);
    background: #2a2a2a;
    padding: 2px 6px;
    border-radius: 999px;
}