:root {
  --paper: #ffffff;
  --sunken: #f4f6f9;
  --ink: #16202c;
  --muted: #55616f;
  --faint: #7d8896;
  --line: #e0e5ec;
  --accent: #0f6d6a;
  --accent-soft: #e4f1f0;
  --warn: #8a5a06;
  --warn-soft: #fbf1de;
  --f-head: "Inter Tight", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --f-body: "Inter", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --f-mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #10161d;
    --sunken: #182029;
    --ink: #e6ebf1;
    --muted: #a0abb8;
    --faint: #7f8b98;
    --line: #29333f;
    --accent: #5cbdb8;
    --accent-soft: #122b2a;
    --warn: #d8a552;
    --warn-soft: #2b2413;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--f-body);
  font-size: 16px;
  line-height: 1.68;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: 780px;
  margin: 0 auto;
  padding: 0 24px 88px;
}

/* ── Header ─────────────────────────────────────────────── */
.topbar {
  border-bottom: 1px solid var(--line);
  background: var(--sunken);
  margin-bottom: 44px;
}
.topbar-inner {
  max-width: 780px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}
.brand {
  font-family: var(--f-head);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-decoration: none;
}
.brand span { color: var(--accent); }
.topbar nav { margin-left: auto; display: flex; gap: 18px; }
.topbar nav a {
  font-size: 14px;
  color: var(--muted);
  text-decoration: none;
}
.topbar nav a:hover, .topbar nav a[aria-current="page"] { color: var(--accent); }

/* ── Type ───────────────────────────────────────────────── */
h1 {
  font-family: var(--f-head);
  font-weight: 700;
  font-size: clamp(28px, 5vw, 38px);
  line-height: 1.12;
  letter-spacing: -0.022em;
  margin: 0 0 12px;
}
h2 {
  font-family: var(--f-head);
  font-weight: 600;
  font-size: 21px;
  letter-spacing: -0.012em;
  margin: 40px 0 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}
h3 {
  font-family: var(--f-head);
  font-weight: 600;
  font-size: 16.5px;
  margin: 24px 0 6px;
}
p { margin: 0 0 14px; }
ul, ol { margin: 0 0 14px; padding-left: 22px; }
li { margin-bottom: 7px; }
a { color: var(--accent); }
strong { font-weight: 600; }

.meta {
  color: var(--faint);
  font-size: 14px;
  margin: 0 0 8px;
}
.lede {
  font-size: 17.5px;
  color: var(--muted);
  margin-bottom: 28px;
}

code {
  font-family: var(--f-mono);
  font-size: 0.88em;
  background: var(--sunken);
  padding: 1px 5px;
  border-radius: 3px;
}

/* ── Components ─────────────────────────────────────────── */
.card {
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--sunken);
  padding: 18px 20px;
  margin: 20px 0;
}
.card p:last-child, .card ul:last-child { margin-bottom: 0; }

.callout {
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  padding: 14px 18px;
  border-radius: 0 5px 5px 0;
  margin: 20px 0;
}
.callout.warn { border-left-color: var(--warn); background: var(--warn-soft); }
.callout p:last-child { margin-bottom: 0; }

.contact-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr;
  margin: 18px 0;
}
@media (min-width: 620px) { .contact-grid { grid-template-columns: 1fr 1fr; } }
.contact-item {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 14px 16px;
  background: var(--paper);
}
.contact-item dt {
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--faint);
  margin-bottom: 3px;
}
.contact-item dd { margin: 0; font-size: 15.5px; font-weight: 500; word-break: break-word; }

.tw { overflow-x: auto; margin: 16px 0; border: 1px solid var(--line); border-radius: 6px; }
table { border-collapse: collapse; width: 100%; font-size: 14.5px; }
th, td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
th {
  font-size: 12px;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--faint);
  background: var(--sunken);
  font-weight: 600;
  white-space: nowrap;
}
tr:last-child td { border-bottom: 0; }

.steps { list-style: none; padding: 0; counter-reset: s; }
.steps li {
  counter-increment: s;
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 14px;
  padding: 13px 0;
  border-top: 1px solid var(--line);
  margin: 0;
}
.steps li:last-child { border-bottom: 1px solid var(--line); }
.steps li::before {
  content: counter(s);
  font-family: var(--f-mono);
  font-size: 13px;
  color: var(--accent);
  padding-top: 2px;
}
.steps h3 { margin: 0 0 3px; font-size: 15.5px; }
.steps p { margin: 0; color: var(--muted); font-size: 15px; }

.fill {
  background: var(--warn-soft);
  color: var(--warn);
  border: 1px dashed var(--warn);
  border-radius: 3px;
  padding: 0 6px;
  font-size: 0.92em;
  font-weight: 500;
}

footer {
  border-top: 1px solid var(--line);
  margin-top: 52px;
  padding-top: 20px;
  font-size: 14px;
  color: var(--faint);
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}
footer a { color: var(--muted); text-decoration: none; }
footer a:hover { color: var(--accent); }

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