:root {
  --bg: #f7f7f5; --fg: #1d1d1b; --muted: #62625d; --card: #ffffff;
  --border: #dcdcd6; --accent: #1f7a3a; --code-bg: #1d1d1b; --code-fg: #ececea;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161615; --fg: #ececea; --muted: #a0a09a; --card: #212120;
    --border: #3a3a37; --accent: #5cc97a; --code-bg: #0e0e0d; --code-fg: #ececea;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--fg);
       font: 17px/1.6 system-ui, -apple-system, "Segoe UI", sans-serif; }
.wrap { max-width: 760px; margin: 0 auto; padding: 0 16px; }
header { display: flex; align-items: center; justify-content: space-between;
         padding: 20px 0; }
.brand { font-weight: 700; font-size: 18px; color: inherit; text-decoration: none; }
nav a { color: var(--muted); text-decoration: none; margin-left: 20px; font-size: 15px; }
nav a:hover, a:hover { color: var(--fg); }
.hero { padding: 56px 0 40px; }
h1 { font-size: clamp(32px, 6vw, 48px); line-height: 1.12; margin: 0 0 16px;
     letter-spacing: -0.02em; }
.lede { font-size: 19px; color: var(--muted); margin: 0 0 28px; max-width: 600px; }
.btn { display: inline-block; padding: 10px 18px; border-radius: 8px; font-weight: 600;
       text-decoration: none; font-size: 15px; margin: 0 8px 8px 0; }
.btn-primary { background: var(--fg); color: var(--bg); }
.btn-secondary { border: 1px solid var(--border); color: var(--fg); }
.badge { display: inline-block; font-size: 13px; font-weight: 600; color: var(--muted);
         border: 1px solid var(--border); border-radius: 999px; padding: 2px 10px;
         margin-bottom: 20px; }
section { padding: 32px 0; border-top: 1px solid var(--border); }
h2 { font-size: 24px; margin: 0 0 16px; letter-spacing: -0.01em; }
p { margin: 0 0 14px; }
main a:not(.btn) { color: var(--fg); text-decoration-color: var(--muted); text-underline-offset: 3px; }
pre { background: var(--code-bg); color: var(--code-fg); padding: 16px 18px;
      border-radius: 10px; overflow-x: auto; font-size: 14px; line-height: 1.55; margin: 0 0 14px; }
code { font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; }
p code, li code { background: var(--card); border: 1px solid var(--border);
                  border-radius: 4px; padding: 1px 5px; font-size: 0.88em; }
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
@media (max-width: 560px) { .grid { grid-template-columns: 1fr; } }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 10px;
        padding: 16px 18px; }
.card h3 { font-size: 16px; margin: 0 0 6px; }
.card p { font-size: 15px; color: var(--muted); margin: 0; }
ul.roadmap { list-style: none; padding: 0; margin: 0; }
ul.roadmap li { padding: 6px 0 6px 30px; position: relative; }
ul.roadmap li::before { content: ""; position: absolute; left: 0; top: 11px; width: 16px;
                        height: 16px; border: 2px solid var(--border); border-radius: 4px; }
ul.roadmap li.done::before { background: var(--accent); border-color: var(--accent); }
.muted { color: var(--muted); }
footer { padding: 32px 0 48px; border-top: 1px solid var(--border); font-size: 14px;
         color: var(--muted); }
footer a { color: var(--muted); }
.crumb { color: var(--muted); font-size: 15px; margin: 40px 0 8px; }
.page h1 { font-size: clamp(30px, 5vw, 40px); }
table { width: 100%; border-collapse: collapse; font-size: 15px; margin: 0 0 14px; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); vertical-align: top; }
th { color: var(--muted); font-weight: 600; }
.table-wrap { overflow-x: auto; }
.note { background: var(--card); border: 1px solid var(--border); border-left: 3px solid var(--accent);
        border-radius: 8px; padding: 12px 16px; margin: 0 0 14px; font-size: 15px; }
.toc { padding-left: 20px; margin: 0 0 32px; }
.toc li { margin: 4px 0; }