:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --bg-soft: #f4f6f8;
  --text: #16202a;
  --muted: #55626f;
  --line: #dbe1e7;
  --accent: #0a6b7a;
  --accent-text: #ffffff;
  --code-bg: #0f1720;
  --code-text: #e6edf3;
  --ok: #1a7f4b;
  --warn: #9a5b00;
  --bad: #b3261e;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1218;
    --bg-soft: #151c24;
    --text: #e6edf3;
    --muted: #9aa7b4;
    --line: #26313c;
    --accent: #4fc3d4;
    --accent-text: #05161a;
    --code-bg: #0a0f14;
    --code-text: #e6edf3;
    --ok: #4cc38a;
    --warn: #e0a64a;
    --bad: #ff8a80;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

a { color: var(--accent); text-underline-offset: 2px; }
a:hover { text-decoration-thickness: 2px; }

.skip {
  position: absolute; left: -999px; top: 0;
  background: var(--accent); color: var(--accent-text); padding: 8px 12px;
}
.skip:focus { left: 8px; top: 8px; z-index: 10; }

.wrap { max-width: 960px; margin: 0 auto; padding: 0 20px; }
.narrow { max-width: 720px; }

/* header */
.site-header { border-bottom: 1px solid var(--line); }
.site-header .wrap {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: 8px 24px; padding-top: 14px; padding-bottom: 14px;
}
.brand { font-weight: 700; font-size: 1.1rem; color: var(--text); text-decoration: none; letter-spacing: -0.01em; }
.brand span { color: var(--accent); }
nav ul { display: flex; flex-wrap: wrap; gap: 4px 20px; list-style: none; margin: 0; padding: 0; align-items: center; }
nav a { color: var(--text); text-decoration: none; }
nav a:hover, nav a[aria-current="page"] { color: var(--accent); }

/* buttons */
.btn {
  display: inline-block; padding: 10px 18px; border-radius: 8px; font-weight: 600;
  text-decoration: none; border: 1px solid var(--accent); background: var(--accent); color: var(--accent-text);
}
.btn:hover { filter: brightness(1.08); }
.btn.secondary { background: transparent; color: var(--accent); }
nav .btn { padding: 6px 14px; color: var(--accent-text); }
nav .btn:hover { color: var(--accent-text); }

/* hero */
.hero { padding: 64px 0 40px; }
.hero h1 { font-size: clamp(2rem, 5vw, 3rem); line-height: 1.15; letter-spacing: -0.02em; margin: 0 0 16px; }
.hero p.lead { font-size: 1.2rem; color: var(--muted); max-width: 640px; margin: 0 0 28px; }
.hero .actions { display: flex; flex-wrap: wrap; gap: 12px; }
.badge {
  display: inline-block; font-size: 0.8rem; font-weight: 600; padding: 2px 10px; margin-bottom: 18px;
  border: 1px solid var(--line); border-radius: 999px; color: var(--muted); background: var(--bg-soft);
}

/* sections */
section { padding: 40px 0; }
section.soft { background: var(--bg-soft); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
h2 { font-size: 1.6rem; line-height: 1.25; letter-spacing: -0.01em; margin: 0 0 12px; }
h3 { font-size: 1.1rem; margin: 0 0 6px; }
p { margin: 0 0 14px; }
.muted { color: var(--muted); }

.steps { display: grid; gap: 20px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); list-style: none; padding: 0; margin: 24px 0 0; counter-reset: step; }
.steps li { counter-increment: step; padding: 18px; border: 1px solid var(--line); border-radius: 12px; background: var(--bg); }
.steps li::before {
  content: counter(step); display: inline-flex; align-items: center; justify-content: center;
  width: 28px; height: 28px; margin-bottom: 10px; border-radius: 50%;
  background: var(--accent); color: var(--accent-text); font-weight: 700; font-size: 0.9rem;
}

.cards { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); margin-top: 24px; }
.card { padding: 18px; border: 1px solid var(--line); border-radius: 12px; background: var(--bg); }
.card p { margin: 0; color: var(--muted); font-size: 0.95rem; }

figure { margin: 24px 0 0; }
figure svg { width: 100%; height: auto; max-width: 760px; display: block; }
figcaption { color: var(--muted); font-size: 0.9rem; margin-top: 8px; }
.diagram-box { fill: var(--bg-soft); stroke: var(--line); }
.diagram-accent { fill: var(--accent); }
.diagram-text { fill: var(--text); font: 600 14px system-ui, sans-serif; }
.diagram-sub { fill: var(--muted); font: 12px system-ui, sans-serif; }
.diagram-line { stroke: var(--muted); stroke-width: 1.5; fill: none; }
.diagram-head { fill: var(--muted); }

/* code */
pre {
  background: var(--code-bg); color: var(--code-text); padding: 16px; border-radius: 10px;
  overflow-x: auto; font: 0.88rem/1.55 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; margin: 0 0 18px;
}
code { font: 0.9em ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
:not(pre) > code { background: var(--bg-soft); border: 1px solid var(--line); border-radius: 5px; padding: 1px 5px; }

/* docs and legal pages */
.page { padding: 40px 0 56px; }
.page h1 { font-size: 2rem; letter-spacing: -0.02em; margin: 0 0 8px; }
.page h2 { margin-top: 36px; }
.page .updated { color: var(--muted); font-size: 0.9rem; margin-bottom: 24px; }
.page ul, .page ol { padding-left: 22px; margin: 0 0 14px; }
.page li { margin-bottom: 4px; }

table { border-collapse: collapse; width: 100%; margin: 0 0 18px; font-size: 0.95rem; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-weight: 600; font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.04em; }
.table-scroll { overflow-x: auto; }

.note { border-left: 4px solid var(--accent); background: var(--bg-soft); padding: 12px 16px; border-radius: 0 8px 8px 0; margin: 0 0 18px; }

/* forms */
.form label { display: block; font-weight: 600; margin-bottom: 4px; }
.form input[type="text"], .form input[type="email"], .form select, .form textarea {
  width: 100%; padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px;
  background: var(--bg); color: var(--text); font: inherit;
}
.form textarea { resize: vertical; min-height: 140px; }
.form button { cursor: pointer; font: inherit; font-weight: 600; }
/* a field only a bot fills in: out of sight and out of the tab order, but not display:none */
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }

/* footer */
.site-footer { border-top: 1px solid var(--line); padding: 28px 0 40px; color: var(--muted); font-size: 0.9rem; }
.site-footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px 24px; }
.site-footer ul { display: flex; flex-wrap: wrap; gap: 4px 18px; list-style: none; margin: 0; padding: 0; }
.site-footer a { color: var(--muted); }

:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

@media (max-width: 560px) {
  .hero { padding-top: 40px; }
  .site-header .wrap { flex-direction: column; align-items: flex-start; }
}