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

:root {
    --bg:      #0a0a0a;
    --surface: #141414;
    --border:  #262626;
    --text:    #e8e8e8;
    --muted:   #888;
    --accent:  #60a5fa;
    --radius:  8px;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.65;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ─ Nav ───────────────────────────────────── */

.nav {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    gap: 0.125rem;
    padding: 0 1.5rem;
    height: 56px;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.nav-brand {
    font-weight: 700;
    font-size: 1rem;
    color: var(--text);
    text-decoration: none;
    letter-spacing: -0.02em;
    margin-right: 1.25rem;
    flex-shrink: 0;
}

.nav-toggle {
    display: none;
}

.nav-burger {
    display: none;
    cursor: pointer;
    color: var(--text);
    font-size: 1.25rem;
    padding: 0.5rem;
    border-radius: var(--radius);
    line-height: 1;
    user-select: none;
    margin-left: auto;
    transition: background 0.15s;
}

.nav-burger:hover {
    background: var(--border);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 0.125rem;
}

.nav-links a {
    display: block;
    color: var(--muted);
    text-decoration: none;
    font-size: 0.875rem;
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius);
    white-space: nowrap;
    transition: color 0.15s, background 0.15s;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text);
    background: var(--border);
}

@media (max-width: 640px) {
    .nav {
        flex-wrap: wrap;
        height: auto;
        padding: 0 1rem;
        gap: 0;
    }

    .nav-brand {
        padding: 0.875rem 0;
        margin-right: 0;
    }

    .nav-burger {
        display: flex;
        align-items: center;
    }

    .nav-links {
        display: none;
        width: 100%;
        flex-direction: column;
        gap: 0.25rem;
        padding: 0.5rem 0 0.875rem;
    }

    .nav-toggle:checked ~ .nav-links {
        display: flex;
    }

    .nav-links a {
        padding: 0.625rem 0.75rem;
    }
}

/* ─ Content ───────────────────────────────── */

.container {
    flex: 1;
    max-width: 720px;
    width: 100%;
    margin: 0 auto;
    padding: 2.5rem 1.5rem;
}

h1 {
    font-size: 1.625rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    margin-bottom: 1.75rem;
    color: var(--text);
}

h2 {
    font-size: 0.6875rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--muted);
    margin: 2.25rem 0 0.75rem;
}

p {
    color: var(--muted);
    margin-bottom: 0.75rem;
    font-size: 0.9375rem;
}

p strong {
    color: var(--text);
}

a {
    color: var(--accent);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* ─ Spec table ────────────────────────────── */

.spec-table {
    width: 100%;
    border-collapse: collapse;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}

.spec-table tr + tr {
    border-top: 1px solid var(--border);
}

.spec-table td {
    padding: 0.75rem 1rem;
    font-size: 0.9375rem;
}

.spec-table td:first-child {
    color: var(--muted);
}

.spec-table td:last-child {
    color: var(--text);
    font-weight: 500;
    text-align: right;
}

/* ─ Footer ────────────────────────────────── */

.footer {
    padding: 1.25rem 1.5rem;
    border-top: 1px solid var(--border);
    text-align: center;
    font-size: 0.8125rem;
    color: var(--muted);
    flex-shrink: 0;
}

.footer a {
    color: var(--muted);
    text-decoration: none;
    margin: 0 0.5rem;
    transition: color 0.15s;
}

.footer a:hover {
    color: var(--text);
}