:root {
  --bg: #fbfaf7; --fg: #1d2129; --muted: #5c6370; --line: #dcd9d1; --card: #ffffff;
  --accent: #1f5f8b; --accent-fg: #ffffff; --err: #a32020; --ok: #1d6b3a; --code: #f1efe9;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #15171b; --fg: #e6e4df; --muted: #9aa0aa; --line: #2e323a; --card: #1d2026;
          --accent: #6fb0dc; --accent-fg: #0d1014; --err: #ff8a80; --ok: #7fd49a; --code: #23262d; }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--fg);
       font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; }
a { color: var(--accent); }
.top { display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap;
       padding: 14px 16px; border-bottom: 1px solid var(--line); max-width: 1040px; margin: 0 auto; }
.brand { font-weight: 700; letter-spacing: .06em; text-decoration: none; color: var(--fg); }
nav { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; }
.inline { display: inline; margin: 0; }
button.link { background: none; border: 0; padding: 0; color: var(--accent); font: inherit; cursor: pointer; text-decoration: underline; }
main { max-width: 1040px; margin: 0 auto; padding: 24px 16px 48px; }
main.page { max-width: 820px; }
h1 { font-size: 1.9rem; line-height: 1.2; margin: .4em 0 .5em; }
h2 { font-size: 1.35rem; margin: 1.8em 0 .5em; }
h3 { font-size: 1.05rem; margin: 0 0 .4em; }
.hero { padding: 24px 0 8px; }
.hero h1 { font-size: 2.3rem; max-width: 22ch; }
.lead { font-size: 1.15rem; max-width: 60ch; }
.button { display: inline-block; padding: 10px 18px; border-radius: 6px; background: var(--accent); color: var(--accent-fg);
          text-decoration: none; margin: 6px 8px 6px 0; border: 1px solid var(--accent); }
.button.ghost { background: transparent; color: var(--accent); }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 16px; }
.card p { margin: 0; }
.finding { background: var(--card); border: 1px solid var(--line); border-left: 4px solid var(--err); border-radius: 8px; padding: 16px; max-width: 640px; }
.finding dl { display: grid; grid-template-columns: max-content 1fr; gap: 4px 16px; margin: 8px 0; }
.finding dt { color: var(--muted); }
.finding dd { margin: 0; }
.tag { display: inline-block; font-size: .8rem; padding: 1px 8px; border-radius: 10px; background: var(--err); color: var(--bg); margin-right: 6px; }
.muted { color: var(--muted); }
.contact { font-size: 1.1rem; }
.form { display: grid; gap: 14px; max-width: 520px; margin: 12px 0; }
.form label { display: grid; gap: 4px; }
.form label.check { display: flex; gap: 8px; align-items: flex-start; }
input, textarea, button { font: inherit; }
input:not([type=checkbox]), textarea { width: 100%; padding: 8px 10px; border: 1px solid var(--line); border-radius: 6px;
                                         background: var(--card); color: var(--fg); }
.form button { justify-self: start; padding: 9px 18px; border-radius: 6px; border: 1px solid var(--accent);
               background: var(--accent); color: var(--accent-fg); cursor: pointer; }
.error { color: var(--err); }
.notice { color: var(--ok); overflow-wrap: anywhere; }
.list { padding-left: 1.2em; }
.terms li { margin-bottom: .6em; }
.table { overflow-x: auto; margin: 8px 0 16px; }
table { border-collapse: collapse; font-size: .92rem; }
th, td { border: 1px solid var(--line); padding: 5px 8px; text-align: left; vertical-align: top; }
th { background: var(--code); }
code, pre { background: var(--code); border-radius: 4px; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: .88em; }
code { padding: 1px 4px; }
pre { padding: 12px; overflow-x: auto; }
code.hash { word-break: break-all; }
.protocol h1 { font-size: 1.6rem; }
.foot { max-width: 1040px; margin: 0 auto; padding: 16px; border-top: 1px solid var(--line); color: var(--muted); font-size: .9rem; }
@media (max-width: 560px) { .hero h1 { font-size: 1.8rem; } h1 { font-size: 1.6rem; } }