:root {
    --accent: #1A7A47;
    --accent-light: #2D9B5A;
    --bg: #FFFFFF;
    --bg-soft: #F4F6F4;
    --text: #1A1F1B;
    --text-secondary: #5B6660;
    --border: #E5E8E5;
    --max-width: 720px;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #101411;
        --bg-soft: #1A201C;
        --text: #ECEDEC;
        --text-secondary: #97A09B;
        --border: #2A2F2C;
    }
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, system-ui, sans-serif;
    font-size: 16px;
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
}

header {
    border-bottom: 1px solid var(--border);
    background: var(--bg);
    position: sticky;
    top: 0;
    z-index: 10;
    backdrop-filter: saturate(180%) blur(20px);
}

.header-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 14px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text);
    font-weight: 700;
    font-size: 1.15rem;
}

.brand img {
    width: 32px;
    height: 32px;
    border-radius: 7px;
}

nav {
    display: flex;
    gap: 18px;
    font-size: 0.92rem;
}

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

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

main {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 32px 20px 80px;
}

main h1 {
    font-size: 2rem;
    margin: 0 0 8px;
    letter-spacing: -0.02em;
}

main h2 {
    font-size: 1.25rem;
    margin: 32px 0 8px;
    letter-spacing: -0.01em;
}

main h3 {
    font-size: 1.05rem;
    margin: 24px 0 4px;
    color: var(--text);
}

main p, main li {
    color: var(--text);
}

main .lede {
    color: var(--text-secondary);
    font-size: 1.05rem;
    margin-top: 0;
}

a {
    color: var(--accent);
}

ul {
    padding-left: 1.25rem;
}

ul li {
    margin: 4px 0;
}

code {
    background: var(--bg-soft);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9em;
    font-family: ui-monospace, "SF Mono", Menlo, Monaco, monospace;
}

.card {
    background: var(--bg-soft);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
    margin: 16px 0;
}

.cta {
    display: inline-block;
    background: var(--accent);
    color: #fff !important;
    padding: 12px 22px;
    border-radius: 999px;
    text-decoration: none;
    font-weight: 600;
    transition: background 0.15s ease;
}

.cta:hover {
    background: var(--accent-light);
}

.meta {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-top: 24px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 14px;
    margin: 24px 0;
}

.feature {
    background: var(--bg-soft);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 16px;
}

.feature-icon {
    color: var(--accent);
    font-size: 1.4rem;
    margin-bottom: 8px;
}

.feature h3 {
    margin: 0 0 4px;
    font-size: 1rem;
}

.feature p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

footer {
    border-top: 1px solid var(--border);
    padding: 24px 20px;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

footer a {
    color: var(--text-secondary);
    text-decoration: none;
    margin: 0 8px;
}

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

@media (max-width: 480px) {
    main h1 { font-size: 1.6rem; }
    nav { gap: 12px; font-size: 0.85rem; }
}