:root {
  --bg: #fbfaf7;
  --surface: #ffffff;
  --text: #1d1d1b;
  --muted: #5d5b55;
  --line: #e3e0d8;
  --accent: #1f5f8b;
  --accent-text: #ffffff;
  --accent-soft: #e8f0f6;
  --ok: #1e6b3a;
  --ok-soft: #e6f2ea;
  --err: #9b2c2c;
  --err-soft: #f8e9e9;
  --radius: 10px;
  --mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161614;
    --surface: #1f1f1c;
    --text: #ecebe6;
    --muted: #a9a69d;
    --line: #34332e;
    --accent: #7fb6dd;
    --accent-text: #0f1a22;
    --accent-soft: #1d2a33;
    --ok: #8fd1a5;
    --ok-soft: #18291e;
    --err: #f0a3a3;
    --err-soft: #2f1b1b;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 var(--sans);
}

a { color: var(--accent); }

.wrap {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 16px;
}

.topbar {
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}

.topbar .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 20px;
  padding-top: 12px;
  padding-bottom: 12px;
}

.brand {
  font-weight: 700;
  font-size: 18px;
  color: var(--text);
  text-decoration: none;
  margin-right: auto;
}

.nav { display: flex; gap: 16px; flex-wrap: wrap; }
.nav a { text-decoration: none; font-weight: 500; }
.nav a[aria-current="page"] { color: var(--text); }

.langs { display: flex; gap: 4px; }
.langs button {
  font: inherit;
  font-size: 13px;
  padding: 3px 8px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
}
.langs button[aria-pressed="true"] {
  background: var(--text);
  color: var(--bg);
  border-color: var(--text);
}

main.wrap { padding-top: 32px; padding-bottom: 48px; }

h1 { font-size: 30px; line-height: 1.2; margin: 0 0 12px; }
h2 { font-size: 21px; margin: 40px 0 12px; }
h3 { font-size: 17px; margin: 0 0 4px; }

.lead { font-size: 18px; color: var(--muted); max-width: 46em; margin: 0 0 8px; }
.note { color: var(--muted); font-size: 14px; }

.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 12px;
  counter-reset: step;
  padding: 0;
  margin: 0;
  list-style: none;
}
.steps li {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
}
.steps li::before {
  counter-increment: step;
  content: counter(step);
  display: inline-grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 700;
  font-size: 14px;
  margin-bottom: 8px;
}
.steps p { margin: 4px 0 0; color: var(--muted); font-size: 15px; }

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 380px), 1fr));
  gap: 12px;
}
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.card .market {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}
.card .badge {
  display: inline-block;
  min-width: 28px;
  padding: 1px 6px;
  margin-right: 6px;
  border-radius: 4px;
  background: var(--accent-soft);
  color: var(--accent);
  text-align: center;
}
.card p { margin: 0; color: var(--muted); font-size: 15px; flex: 1; }
.card .version { font-size: 13px; color: var(--muted); }
.card .actions { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.card .feedback { font-size: 14px; min-height: 1.4em; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font: inherit;
  font-size: 15px;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: 8px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: var(--accent-text);
  cursor: pointer;
  text-decoration: none;
  min-height: 40px;
}
.btn.secondary {
  background: transparent;
  color: var(--accent);
}
.btn.quiet {
  border-color: var(--line);
  background: transparent;
  color: var(--text);
  font-weight: 500;
}
.btn:disabled { opacity: 0.55; cursor: progress; }
.btn:focus-visible, .langs button:focus-visible, .tabs button:focus-visible, textarea:focus-visible, input:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

.tips { padding-left: 20px; margin: 0; }
.tips li { margin: 6px 0; }

.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
}

.tabs { display: flex; gap: 4px; margin-bottom: 12px; }
.tabs button {
  font: inherit;
  font-weight: 600;
  padding: 8px 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
}
.tabs button[aria-selected="true"] {
  background: var(--accent-soft);
  color: var(--accent);
  border-color: var(--accent);
}

textarea {
  width: 100%;
  min-height: 300px;
  resize: vertical;
  font: 13px/1.45 var(--mono);
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
}

.row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 12px;
  align-items: center;
  margin-top: 12px;
}
.row label { font-size: 14px; color: var(--muted); }
.row input[type="text"] {
  font: inherit;
  font-size: 15px;
  padding: 7px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  min-width: 0;
  width: 220px;
  max-width: 100%;
}
.spacer { flex: 1; }

.status {
  margin-top: 12px;
  padding: 10px 12px;
  border-radius: 8px;
  font-size: 15px;
}
.status:empty { display: none; }
.status.info { background: var(--accent-soft); }
.status.ok { background: var(--ok-soft); color: var(--ok); }
.status.err { background: var(--err-soft); color: var(--err); }

.result, .error-box { margin-top: 16px; }
.result h3, .error-box h3 { margin-bottom: 8px; }
.result ul { margin: 8px 0 0; padding-left: 20px; }

pre.diag {
  white-space: pre-wrap;
  word-break: break-word;
  font: 13px/1.45 var(--mono);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
  margin: 8px 0;
  max-height: 260px;
  overflow: auto;
}

.preview {
  margin-top: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: #fff;
}
.preview iframe {
  display: block;
  width: 100%;
  height: 640px;
  border: 0;
  background: #fff;
}

.hidden { display: none !important; }

footer {
  border-top: 1px solid var(--line);
  padding: 20px 0 32px;
  color: var(--muted);
  font-size: 14px;
}
footer p { margin: 4px 0; }

@media (max-width: 560px) {
  h1 { font-size: 25px; }
  .lead { font-size: 17px; }
  textarea { min-height: 240px; }
  .preview iframe { height: 480px; }
}