:root {
    --bg: #0d1117;
    --surface: #161b22;
    --surface-2: #1c2128;
    --border: #30363d;
    --border-strong: #444c56;
    --text: #e6edf3;
    --text-muted: #8b949e;
    --accent: #39d0d8;
    --accent-hover: #5ee0e6;
    --accent-soft: rgba(57, 208, 216, 0.12);
    --code-bg: #1c2128;
    --shadow-card: 0 1px 0 rgba(255, 255, 255, 0.03), 0 8px 24px rgba(0, 0, 0, 0.4);
    --radius: 8px;
    --radius-lg: 12px;
    --container: 1100px;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-mono: ui-monospace, "SF Mono", "Cascadia Code", "JetBrains Mono", Consolas, "Liberation Mono", monospace;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.15s ease;
}

a:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

h1, h2, h3, h4 {
    color: var(--text);
    line-height: 1.25;
    margin: 0 0 0.6em;
    font-weight: 600;
    letter-spacing: -0.01em;
}

h1 { font-size: 2.6rem; letter-spacing: -0.02em; }
h2 { font-size: 1.75rem; margin-top: 2.5rem; }
h3 { font-size: 1.2rem; }

p { margin: 0 0 1rem; color: var(--text); }
p.muted { color: var(--text-muted); }

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

/* ---------- Header ---------- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(13, 17, 23, 0.85);
    backdrop-filter: saturate(180%) blur(10px);
    -webkit-backdrop-filter: saturate(180%) blur(10px);
    border-bottom: 1px solid var(--border);
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    color: var(--text);
}

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

.brand img {
    height: 28px;
    width: auto;
    display: block;
}

.brand-text {
    font-size: 1.05rem;
    letter-spacing: -0.01em;
}

.nav {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav a {
    color: var(--text-muted);
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 0.95rem;
    font-weight: 500;
    transition: color 0.15s ease, background 0.15s ease;
}

.nav a:hover {
    color: var(--text);
    background: var(--surface);
    text-decoration: none;
}

.nav a.active {
    color: var(--accent);
}

.nav a.external::after {
    content: " \2197";
    color: var(--text-muted);
    font-size: 0.85em;
}

.nav-toggle {
    display: none;
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text);
    width: 40px;
    height: 40px;
    border-radius: 6px;
    cursor: pointer;
    align-items: center;
    justify-content: center;
}

.nav-toggle:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.nav-toggle .bar {
    display: block;
    width: 18px;
    height: 2px;
    background: var(--text);
    position: relative;
}

.nav-toggle .bar::before,
.nav-toggle .bar::after {
    content: "";
    position: absolute;
    left: 0;
    width: 18px;
    height: 2px;
    background: var(--text);
}

.nav-toggle .bar::before { top: -6px; }
.nav-toggle .bar::after  { top: 6px; }

/* ---------- Hero ---------- */
.hero {
    padding: 80px 0 48px;
    text-align: center;
}

.hero img.hero-logo {
    width: 140px;
    height: auto;
    margin-bottom: 28px;
    filter: drop-shadow(0 4px 16px rgba(57, 208, 216, 0.15));
}

.hero h1 {
    font-size: 3rem;
    max-width: 800px;
    margin: 0 auto 16px;
    background: linear-gradient(180deg, #ffffff 0%, #b8c5d1 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero .lead {
    font-size: 1.2rem;
    color: var(--text-muted);
    max-width: 680px;
    margin: 0 auto 32px;
}

.hero .cta-row {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
    margin-top: 8px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 11px 20px;
    border-radius: 6px;
    font-size: 0.95rem;
    font-weight: 600;
    border: 1px solid transparent;
    cursor: pointer;
    transition: background 0.15s ease, border-color 0.15s ease, transform 0.05s ease;
}

.btn:hover { text-decoration: none; }
.btn:active { transform: translateY(1px); }

.btn-primary {
    background: var(--accent);
    color: #08161c;
}

.btn-primary:hover {
    background: var(--accent-hover);
    color: #08161c;
}

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

.btn-secondary:hover {
    background: var(--surface-2);
    border-color: var(--border-strong);
    color: var(--text);
}

.btn .ext::after {
    content: "\2197";
    margin-left: 2px;
    opacity: 0.7;
}

/* ---------- Badges ---------- */
.badges {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 10px;
    justify-content: center;
    padding: 8px 0 56px;
}

.badges img {
    height: 20px;
    display: block;
    opacity: 0.9;
    transition: opacity 0.15s ease;
}

.badges a:hover img { opacity: 1; }

/* ---------- Sections ---------- */
section {
    padding: 56px 0;
}

section.tight { padding: 32px 0; }

.section-eyebrow {
    color: var(--accent);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 8px;
}

.section-intro {
    max-width: 720px;
    margin-bottom: 32px;
    color: var(--text-muted);
}

/* ---------- Cards grid ---------- */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 24px;
    transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

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

.card .card-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 8px;
    background: var(--accent-soft);
    color: var(--accent);
    margin-bottom: 16px;
    font-size: 1.2rem;
}

.card h3 {
    margin: 0 0 8px;
    font-size: 1.1rem;
}

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

a.card { color: inherit; }
a.card:hover { text-decoration: none; }

.card-link {
    color: var(--accent);
    font-weight: 600;
    font-size: 0.9rem;
    margin-top: 12px;
    display: inline-block;
}

/* Placeholder card — visual slot for future contributions */
.card.card-placeholder {
    background: transparent;
    border-style: dashed;
    border-color: var(--border-strong);
    color: var(--text-muted);
}

.card.card-placeholder h3 { color: var(--text-muted); }
.card.card-placeholder p { color: var(--text-muted); opacity: 0.85; }

.card.card-placeholder:hover {
    border-style: solid;
    border-color: var(--accent);
    background: var(--surface);
    transform: none;
    box-shadow: none;
}

a.card.card-placeholder:hover h3,
a.card.card-placeholder:hover p { color: var(--text); }

/* ---------- Code blocks ---------- */
pre.code-block,
.code-block {
    position: relative;
    background: var(--code-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px 18px;
    margin: 16px 0 24px;
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 0.88rem;
    line-height: 1.55;
    color: #d0d8e0;
}

pre.code-block code {
    font-family: inherit;
    color: inherit;
    background: none;
    padding: 0;
}

code {
    font-family: var(--font-mono);
    font-size: 0.92em;
    background: var(--surface-2);
    border: 1px solid var(--border);
    padding: 1px 6px;
    border-radius: 4px;
    color: #d0d8e0;
}

.copy-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    background: var(--surface);
    color: var(--text-muted);
    border: 1px solid var(--border);
    padding: 4px 10px;
    border-radius: 5px;
    font-size: 0.75rem;
    font-family: var(--font-sans);
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

pre.code-block:hover .copy-btn,
.copy-btn:focus-visible {
    opacity: 1;
}

.copy-btn:hover {
    color: var(--text);
    border-color: var(--accent);
}

.copy-btn.copied {
    color: var(--accent);
    border-color: var(--accent);
    opacity: 1;
}

/* ---------- Steps ---------- */
.step {
    display: flex;
    gap: 20px;
    margin: 24px 0 32px;
    align-items: flex-start;
}

.step-num {
    flex-shrink: 0;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--accent-soft);
    color: var(--accent);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-family: var(--font-mono);
    font-size: 0.95rem;
    border: 1px solid var(--accent);
}

.step-body {
    flex: 1;
    min-width: 0;
}

.step-body h3 {
    margin: 4px 0 8px;
}

/* ---------- Page hero (smaller) ---------- */
.page-hero {
    padding: 64px 0 24px;
    text-align: center;
}

.page-hero h1 {
    font-size: 2.4rem;
}

.page-hero p {
    color: var(--text-muted);
    max-width: 640px;
    margin: 0 auto;
    font-size: 1.05rem;
}

/* ---------- Maintainer card ---------- */
.maintainer {
    display: flex;
    gap: 24px;
    align-items: center;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px;
    margin: 24px 0;
}

.maintainer-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: var(--accent-soft);
    color: var(--accent);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: 600;
    font-family: var(--font-mono);
    flex-shrink: 0;
    border: 1px solid var(--accent);
}

.maintainer h3 {
    margin: 0 0 4px;
    font-size: 1.3rem;
}

.maintainer .role {
    color: var(--text-muted);
    margin: 0 0 8px;
    font-size: 0.95rem;
}

.maintainer .links {
    display: flex;
    flex-wrap: wrap;
    gap: 12px 18px;
    margin-top: 8px;
    font-size: 0.95rem;
}

/* ---------- Callout ---------- */
.callout {
    background: var(--surface);
    border: 1px solid var(--border);
    border-left: 3px solid var(--accent);
    border-radius: var(--radius);
    padding: 18px 20px;
    margin: 20px 0;
}

.callout h4 {
    margin: 0 0 8px;
    font-size: 1rem;
    color: var(--accent);
}

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

/* ---------- Footer ---------- */
.site-footer {
    border-top: 1px solid var(--border);
    padding: 32px 0;
    margin-top: 80px;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.site-footer .container {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
}

.site-footer .links {
    display: flex;
    gap: 18px;
    flex-wrap: wrap;
}

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

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

/* ---------- 404 ---------- */
.notfound {
    text-align: center;
    padding: 120px 0;
}

.notfound .code {
    font-family: var(--font-mono);
    font-size: 5rem;
    color: var(--accent);
    margin: 0 0 8px;
    letter-spacing: -0.04em;
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
    h1 { font-size: 2rem; }
    .hero h1 { font-size: 2.2rem; }
    .hero .lead { font-size: 1.05rem; }
    .hero { padding: 48px 0 32px; }
    .page-hero { padding: 48px 0 16px; }
    .page-hero h1 { font-size: 1.8rem; }
    section { padding: 40px 0; }

    .nav-toggle {
        display: inline-flex;
    }

    .nav {
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        flex-direction: column;
        align-items: stretch;
        gap: 4px;
        background: var(--bg);
        border-bottom: 1px solid var(--border);
        padding: 12px 24px 18px;
        display: none;
    }

    .nav.is-open {
        display: flex;
    }

    .nav a {
        padding: 10px 12px;
    }

    .maintainer {
        flex-direction: column;
        text-align: center;
    }

    .maintainer .links {
        justify-content: center;
    }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}