:root {
  --bg: #faf8f5;
  --card: #ffffff;
  --ink: #1a1918;
  --muted: #6b6864;
  --line: #e6e4e0;
  --soft: #f2efea;
  --accent: #ee8569;
  --warn: #9a4a12;
  --warn-bg: #fdf1e7;
  --btn: #111111;
  --btn-ink: #ffffff;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121110;
    --card: #1c1b1a;
    --ink: #eceae6;
    --muted: #a09e9b;
    --line: #2e2d2a;
    --soft: #252422;
    --warn: #f0b27a;
    --warn-bg: #2d2118;
    --btn: #eceae6;
    --btn-ink: #121110;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

/* Components set display; [hidden] must still win. */
[hidden] { display: none !important; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", Roboto, "Noto Sans CJK SC", sans-serif;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-underline-offset: 3px; }

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 16px 72px;
}

.head { text-align: center; margin-bottom: 28px; }
.icon { border-radius: 14px; display: block; margin: 0 auto 16px; }
h1 { font-size: 30px; line-height: 1.25; margin: 0 0 10px; letter-spacing: -0.02em; }
h2 { font-size: 20px; margin: 0 0 8px; letter-spacing: -0.01em; }
.lead { color: var(--muted); font-size: 17px; margin: 0; }

.muted { color: var(--muted); }
.small { font-size: 13.5px; }
.mono, code {
  font-family: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, Consolas, monospace;
}

.note {
  background: var(--soft);
  border-radius: 12px;
  padding: 10px 14px;
  font-size: 14.5px;
}
.warn {
  background: var(--warn-bg);
  color: var(--warn);
  border-radius: 12px;
  padding: 10px 14px;
  font-size: 14.5px;
}
#phone-note { margin-top: 18px; }

.tabs {
  display: flex;
  gap: 4px;
  padding: 4px;
  background: var(--soft);
  border-radius: 999px;
  margin: 0 auto 16px;
  max-width: 420px;
}
.tabs button {
  flex: 1;
  border: 0;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 15px;
  font-weight: 600;
  padding: 8px 0;
  border-radius: 999px;
  cursor: pointer;
}
.tabs button[aria-selected="true"] { background: var(--btn); color: var(--btn-ink); }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 24px;
  margin-bottom: 16px;
}

.steps { padding-left: 1.4em; margin: 0 0 12px; }
.steps > li { margin-bottom: 12px; padding-left: 4px; }
.steps > li::marker { font-weight: 700; }

.cmd {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 10px 0 4px;
  padding: 6px 6px 6px 14px;
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: 12px;
}
.cmd code {
  flex: 1;
  min-width: 0;
  font-size: 14px;
  overflow-wrap: anywhere;
  user-select: all;
}
.copy, .btn {
  border: 0;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  border-radius: 999px;
}
.copy {
  flex: none;
  font-size: 13.5px;
  padding: 7px 14px;
  background: var(--card);
  color: var(--ink);
  border: 1px solid var(--line);
}
.copy.primary { background: var(--btn); color: var(--btn-ink); border-color: transparent; }
.btn {
  display: block;
  width: 100%;
  padding: 12px 18px;
  font-size: 16px;
  background: var(--btn);
  color: var(--btn-ink);
}

details {
  border-top: 1px solid var(--line);
  padding-top: 12px;
  margin-top: 12px;
}
summary { cursor: pointer; font-weight: 600; }
details > :not(summary) { font-size: 14.5px; }
details ul, details ol, .card ul { padding-left: 1.3em; }
.links { color: var(--muted); font-size: 14px; overflow-wrap: anywhere; }

.form { display: grid; gap: 12px; }
.form label { display: grid; gap: 4px; font-size: 14px; color: var(--muted); }
.form input {
  font: inherit;
  color: var(--ink);
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px 12px;
}

.sums { width: 100%; border-collapse: collapse; margin: 8px 0 12px; }
.sums td { padding: 6px 8px 6px 0; border-top: 1px solid var(--line); vertical-align: top; }
.sums td:last-child { overflow-wrap: anywhere; word-break: break-all; }

.foot { text-align: center; margin-top: 28px; }

/* The QR view. */
.show { max-width: 460px; }
.qr-card { text-align: center; }
.qr-frame {
  background: #ffffff;
  border-radius: 16px;
  padding: 12px;
  margin: 18px auto;
  width: min(100%, 320px);
  box-shadow: 0 0 0 1px var(--line);
}
#qr { display: block; width: 100%; height: auto; image-rendering: pixelated; }
.facts {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 14px;
  text-align: left;
  margin: 0 auto 16px;
  max-width: 340px;
}
.facts dt { color: var(--muted); }
.facts dd { margin: 0; font-weight: 600; overflow-wrap: anywhere; }
.qr-card .warn, .qr-card .muted { text-align: left; }

@media (max-width: 480px) {
  .wrap { padding-top: 32px; }
  h1 { font-size: 26px; }
  .card { padding: 18px 16px; border-radius: 16px; }
  .cmd { flex-direction: column; align-items: stretch; padding: 10px; }
  .copy { align-self: flex-end; }
}