:root {
  --ink: #171521; --paper: #faf9fc; --surface: #ffffff;
  --primary: #5b4fe9; --primary-ink: #ffffff; --accent: #00a87d;
  --danger: #c23a3a; --danger-soft: #fceaea; --muted: #6b6880; --line: #e4e1f2;
  --font-display: 'Plus Jakarta Sans','Segoe UI',system-ui,sans-serif;
  --font-body: 'Public Sans','Segoe UI',system-ui,sans-serif;
  --font-mono: 'IBM Plex Mono','SFMono-Regular',Consolas,monospace;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ink: #edeaf7; --paper: #131120; --surface: #1b1830;
    --primary: #9b90ff; --primary-ink: #171226; --accent: #4fd8ab;
    --danger: #ef8080; --danger-soft: #2c1616; --muted: #a49fc0; --line: #322c4c;
  }
}
:root[data-theme="dark"] {
  --ink: #edeaf7; --paper: #131120; --surface: #1b1830;
  --primary: #9b90ff; --primary-ink: #171226; --accent: #4fd8ab;
  --danger: #ef8080; --danger-soft: #2c1616; --muted: #a49fc0; --line: #322c4c;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--font-body); font-size: 15.5px; line-height: 1.6; }
h1, h2 { font-family: var(--font-display); margin: 0 0 6px; text-wrap: balance; }
h1 { font-size: 21px; font-weight: 700; }
h2 { font-size: 14.5px; font-weight: 700; }
.mono { font-family: var(--font-mono); }
.wrap { max-width: 640px; margin: 0 auto; padding: 26px 18px 90px; display: flex; flex-direction: column; gap: 16px; }
.brand-row { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.wordmark { font-family: var(--font-display); font-weight: 800; font-size: 15px; }
.wordmark .b { color: var(--primary); }
.wordmark .a { color: var(--accent); }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 22px 20px; }
.card.success { border-color: color-mix(in srgb, var(--accent) 40%, var(--line)); }
.muted { color: var(--muted); font-size: 13.5px; }
label { display: block; font-size: 12.5px; font-weight: 600; color: var(--muted); margin: 14px 0 6px; }
label:first-of-type { margin-top: 4px; }
input[type=text], input[type=email], input[type=tel], input[type=password], textarea {
  width: 100%; border: 1px solid var(--line); border-radius: 9px; padding: 10px 12px;
  font-family: var(--font-body); font-size: 14.5px; color: var(--ink); background: var(--paper);
}
textarea { resize: vertical; min-height: 160px; line-height: 1.55; font-family: var(--font-mono); font-size: 13px; }
input:focus, textarea:focus { outline: 2px solid var(--primary); outline-offset: 1px; }
.check-row { display: flex; flex-direction: column; gap: 8px; margin-top: 14px; font-size: 13.5px; }
.check-row label, .accept-row { display: flex; align-items: center; gap: 8px; font-weight: 500; color: var(--ink); margin: 0; }
.accept-row { font-size: 13.5px; padding: 2px 2px; }
input[type=checkbox] { width: 17px; height: 17px; accent-color: var(--primary); flex: none; }
.btn { font-family: var(--font-display); font-weight: 700; font-size: 14.5px; border-radius: 10px;
  padding: 12px 18px; cursor: pointer; background: var(--surface); color: var(--ink); border: 1px solid var(--line); }
.btn.primary { background: var(--primary); color: var(--primary-ink); border-color: transparent; width: 100%; }
.btn.big { padding: 14px 18px; font-size: 15px; }
.btn:disabled { opacity: .6; cursor: default; }
.link-btn { background: none; border: none; color: var(--primary); font-size: 13px; font-weight: 600; cursor: pointer; padding: 4px 0; text-decoration: none; }
.error { background: var(--danger-soft); color: var(--danger); border-radius: 8px; padding: 9px 12px; font-size: 13px; margin-top: 10px; }
.contract-text { white-space: pre-wrap; font-size: 14px; line-height: 1.65; color: var(--ink); max-height: 320px; overflow-y: auto; padding-right: 4px; }
canvas#sig-pad { width: 100%; height: 160px; border: 1.5px dashed var(--line); border-radius: 10px; background: var(--paper); touch-action: none; display: block; margin-top: 8px; }
.badge { display: inline-flex; align-items: center; gap: 6px; background: color-mix(in srgb, var(--accent) 16%, transparent); color: var(--accent); font-family: var(--font-mono); font-weight: 600; font-size: 12px; padding: 5px 11px; border-radius: 999px; margin-bottom: 12px; }
.data-list { display: grid; grid-template-columns: auto 1fr; gap: 7px 14px; margin: 0; font-size: 13.8px; }
.data-list dt { color: var(--muted); }
.data-list dd { margin: 0; }
.data-list dd.hash { word-break: break-all; font-size: 12px; }
.sig-img { max-width: 260px; background: var(--paper); border: 1px solid var(--line); border-radius: 8px; padding: 8px; display: block; }
.fineprint { font-size: 11.5px; color: var(--muted); line-height: 1.5; margin: 4px 0 0; }
[hidden] { display: none !important; }