:root {
  --ink: #0b1221;
  --paper: #f7f8fa;
  --surface: #ffffff;
  --accent: #2a6bff;
  --muted: #5b6678;
  --line: #e3e7ee;
  --success: #12a594;
  --danger: #e5484d;
  --mono: ui-monospace, "JetBrains Mono", "Cascadia Code", monospace;
  --sans: system-ui, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

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

.topbar {
  background: var(--ink);
  color: #fff;
  padding: 16px 24px;
}
.topbar .brand {
  font-weight: 700;
  letter-spacing: -0.01em;
}
.topbar .brand span { color: var(--accent); }

.wrap { max-width: 720px; margin: 0 auto; padding: 32px 20px 80px; }
.wrap--wide { max-width: 1080px; }

h1 { font-size: 40px; line-height: 1.1; letter-spacing: -0.02em; margin: 0 0 12px; }
h2 { font-size: 28px; letter-spacing: -0.01em; margin: 0 0 8px; }
.lead { font-size: 18px; color: var(--muted); margin: 0 0 32px; }
.eyebrow { font-family: var(--mono); font-size: 13px; color: var(--accent); text-transform: uppercase; letter-spacing: 0.08em; }

/* Hero (landing) */
.hero { padding: 56px 0 24px; }
.cards { display: grid; gap: 16px; grid-template-columns: 1fr 1fr; margin-top: 24px; }
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 24px;
}
.card h3 { margin: 0 0 6px; font-size: 20px; }
.card p { color: var(--muted); margin: 0 0 16px; }

/* Form fields with mono number markers (signature) */
.field { display: grid; grid-template-columns: 40px 1fr; gap: 12px; margin-bottom: 20px; align-items: start; }
.field .num { font-family: var(--mono); color: var(--accent); font-size: 15px; padding-top: 30px; }
.field label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 6px; }
.field .hint { font-size: 12px; color: var(--muted); margin-top: 4px; }
.field input, .field select, .field textarea {
  width: 100%;
  font-family: var(--sans);
  font-size: 15px;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 12px;
}
.field textarea { min-height: 76px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent);
}
.field.invalid input, .field.invalid select, .field.invalid textarea { border-color: var(--danger); }
.field .error { color: var(--danger); font-size: 12px; margin-top: 4px; display: none; }
.field.invalid .error { display: block; }

fieldset { border: 0; padding: 0; margin: 0 0 8px; }
.section-title { font-family: var(--mono); font-size: 13px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.06em; margin: 28px 0 16px; padding-bottom: 8px; border-bottom: 1px solid var(--line); }

.btn {
  font-family: var(--sans);
  font-size: 15px;
  font-weight: 600;
  border-radius: 8px;
  padding: 12px 20px;
  cursor: pointer;
  border: 1px solid transparent;
  text-decoration: none;
  display: inline-block;
}
.btn--primary { background: var(--accent); color: #fff; }
.btn--primary:hover { background: #1f59e0; }
.btn--ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn[disabled] { opacity: 0.55; cursor: not-allowed; }

.note { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 16px; color: var(--muted); font-size: 14px; }
.result { border-radius: 10px; padding: 16px; margin-top: 20px; display: none; }
.result.show { display: block; }
.result.ok { background: rgba(18,165,148,0.1); border: 1px solid var(--success); color: #0c6b60; }
.result.err { background: rgba(229,72,77,0.08); border: 1px solid var(--danger); color: #a3262b; }

@media (max-width: 640px) {
  h1 { font-size: 30px; }
  .cards { grid-template-columns: 1fr; }
  .field { grid-template-columns: 28px 1fr; gap: 8px; }
  .field .num { padding-top: 28px; font-size: 13px; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}