:root {
    --bg: #0d1117;
    --bg-alt: #111821;
    --surface: #161e28;
    --border: #222c38;
    --text: #e6edf3;
    --text-muted: #8b98a9;
    --accent: #6ee7a4;
    --accent-dim: #3da072;
    --code-bg: #0a0f15;
    --danger: #f87171;
    --radius: 10px;
    --maxw: 960px;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: var(--maxw);
    margin: 0 auto;
    padding: 0 24px;
}

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

a:hover {
    text-decoration: underline;
}

code {
    font-family: var(--font-mono);
    font-size: 0.92em;
    background: var(--code-bg);
    color: var(--accent);
    padding: 2px 6px;
    border-radius: 4px;
    border: 1px solid var(--border);
}

pre {
    background: var(--code-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px 18px;
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 14px;
    line-height: 1.55;
    margin: 14px 0 22px;
}

pre code {
    background: none;
    border: none;
    padding: 0;
    color: var(--text);
    font-size: inherit;
}

h1, h2, h3 {
    line-height: 1.25;
    margin: 0 0 16px;
    font-weight: 700;
    letter-spacing: -0.01em;
}

h1 {
    font-size: 2.6rem;
}

h2 {
    font-size: 1.7rem;
    margin-bottom: 18px;
}

h3 {
    font-size: 1.1rem;
    margin-top: 26px;
    margin-bottom: 8px;
}

p {
    margin: 0 0 14px;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 10;
    background: rgba(13, 17, 23, 0.9);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    color: var(--text);
    font-size: 1.1rem;
    letter-spacing: -0.01em;
}

.brand:hover {
    text-decoration: none;
    color: var(--accent);
}

.brand-icon {
    width: 26px;
    height: 26px;
    color: var(--accent);
}

.lang-switch {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.9rem;
}

.lang-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font: inherit;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
    letter-spacing: 0.05em;
}

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

.lang-btn.is-active {
    color: var(--accent);
    font-weight: 700;
}

.lang-sep {
    color: var(--border);
    user-select: none;
}

.hero {
    padding: 88px 0 56px;
    border-bottom: 1px solid var(--border);
    background:
        radial-gradient(900px 300px at 50% -100px, rgba(110, 231, 164, 0.08), transparent 70%),
        var(--bg);
}

.hero h1 {
    max-width: 720px;
}

.hero .lead {
    font-size: 1.2rem;
    color: var(--text-muted);
    max-width: 680px;
    margin-bottom: 28px;
}

.cta-row {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.btn {
    display: inline-block;
    padding: 10px 18px;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    border: 1px solid transparent;
    transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.btn:hover {
    text-decoration: none;
}

.btn-primary {
    background: var(--accent);
    color: #06130c;
}

.btn-primary:hover {
    background: #88f1b7;
}

.btn-ghost {
    background: transparent;
    color: var(--text);
    border-color: var(--border);
}

.btn-ghost:hover {
    border-color: var(--accent-dim);
    color: var(--accent);
}

.section {
    padding: 56px 0;
}

.section-alt {
    background: var(--bg-alt);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 18px;
    margin-top: 24px;
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px 22px;
    transition: border-color 0.15s ease, transform 0.15s ease;
}

.card:hover {
    border-color: var(--accent-dim);
    transform: translateY(-2px);
}

.card h3 {
    margin: 0 0 8px;
    color: var(--accent);
    font-size: 1.05rem;
}

.card p {
    margin: 0;
    color: var(--text-muted);
    font-size: 0.95rem;
}

.arch-list {
    list-style: none;
    padding: 0;
    margin: 20px 0 0;
    display: grid;
    gap: 12px;
}

.arch-list li {
    background: var(--surface);
    border: 1px solid var(--border);
    border-left: 3px solid var(--accent);
    border-radius: var(--radius);
    padding: 14px 18px;
}

.arch-list strong {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--accent);
    margin-bottom: 4px;
}

.arch-list span {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.table-wrap {
    overflow-x: auto;
    margin-top: 18px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.92rem;
}

th, td {
    text-align: left;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
    vertical-align: top;
}

th {
    background: var(--bg-alt);
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    font-size: 0.76rem;
    letter-spacing: 0.06em;
}

tbody tr:last-child td {
    border-bottom: none;
}

.tag {
    display: inline-block;
    padding: 2px 9px;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
    background: rgba(139, 152, 169, 0.14);
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.tag-on {
    background: rgba(110, 231, 164, 0.14);
    color: var(--accent);
}

.tag-off {
    background: rgba(248, 113, 113, 0.12);
    color: var(--danger);
}

.spec-list {
    list-style: none;
    padding: 0;
    margin: 16px 0 0;
    display: grid;
    gap: 8px;
}

.spec-list li {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 10px 16px;
    color: var(--text-muted);
}

.spec-list strong {
    color: var(--text);
}

.site-footer {
    border-top: 1px solid var(--border);
    padding: 28px 0;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.muted {
    color: var(--text-muted);
    margin: 0;
}

@media (max-width: 640px) {
    h1 {
        font-size: 2rem;
    }
    h2 {
        font-size: 1.4rem;
    }
    .hero {
        padding: 56px 0 40px;
    }
    .hero .lead {
        font-size: 1.05rem;
    }
    .section {
        padding: 40px 0;
    }
    .container {
        padding: 0 18px;
    }
    .header-inner {
        height: 54px;
    }
}