:root {
    --bg: #ffffff;
    --fg: #0a0a0a;
    --muted: #5a5a5a;
    --accent: #ff6b35;
    --card: #f6f6f7;
    --border: #e6e6e8;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0b0b0c;
        --fg: #f2f2f3;
        --muted: #a0a0a4;
        --accent: #ff7a3d;
        --card: #161618;
        --border: #2a2a2d;
    }
}

* { box-sizing: border-box; }

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

main {
    max-width: 720px;
    margin: 0 auto;
    padding: 48px 24px 80px;
}

header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 24px;
}

header .mark {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    background: var(--accent);
}

header h1 {
    font-size: 1.25rem;
    margin: 0;
    font-weight: 600;
    letter-spacing: -0.01em;
}

h1.page-title {
    font-size: 2rem;
    margin: 0 0 6px;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 1.05rem;
    margin: 32px 0 8px;
    letter-spacing: -0.005em;
}

p, li {
    color: var(--fg);
    font-size: 1rem;
}

p.lede {
    color: var(--muted);
    font-size: 1.05rem;
    margin: 0 0 28px;
}

.muted { color: var(--muted); }
.small { font-size: 0.875rem; }

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

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 18px 20px;
    margin: 18px 0;
}

ul { padding-left: 1.25rem; }
li { margin: 4px 0; }

footer {
    margin-top: 56px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
    color: var(--muted);
    font-size: 0.85rem;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px;
}

.button {
    display: inline-block;
    background: var(--accent);
    color: #fff;
    padding: 10px 16px;
    border-radius: 10px;
    font-weight: 600;
    margin-top: 8px;
}
.button:hover { text-decoration: none; opacity: 0.92; }