/* Digital Treasury brand system -- monochrome only, Inter throughout.
   Tokens below map directly to Brand Guidelines v1.0 (Aug 2026):
   colour (sec. 07), type scale (sec. 08), radius & spacing (sec. 09). */
:root {
  --ink: #000000;      /* Ink Black -- primary text, default foreground */
  --paper: #FFFFFF;    /* Paper White -- base surface */
  --n-900: #171717;    /* near-black text */
  --n-700: #404040;    /* body text */
  --n-500: #737373;    /* secondary text */
  --n-400: #A3A3A3;    /* muted / captions */
  --n-300: #D4D4D4;    /* strong borders */
  --n-200: #E5E5E5;    /* hairline borders */
  --n-100: #F5F5F5;    /* raised surface */

  --font: 'Inter', -apple-system, 'Segoe UI', Roboto, system-ui, sans-serif;

  --radius-sm: 4px;    /* inputs, chips */
  --radius-md: 8px;    /* buttons */
  --radius-lg: 16px;   /* cards */
  --radius-xl: 24px;   /* panels */
  --radius-full: 999px;/* pills, avatars */

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 16px;
  --space-4: 24px;
  --space-6: 48px;
}

* { box-sizing: border-box; }

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

.page {
  max-width: 640px;
  margin: 0 auto;
  padding: var(--space-6) var(--space-4) var(--space-6);
}

/* Horizontal lockup: symbol + stacked wordmark (Digital bold / Treasury medium) */
.brand-lockup {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
}

.brand-mark {
  display: block;
  color: var(--ink);
  flex-shrink: 0;
}

.brand-word {
  display: flex;
  flex-direction: column;
  line-height: 1.05;
}

.brand-word .primary {
  font-weight: 800;
  font-size: 15px;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.brand-word .secondary {
  font-weight: 500;
  font-size: 13px;
  color: var(--n-500);
}

.hero h1 {
  font-weight: 900;
  letter-spacing: -0.03em;
  font-size: 40px;
  line-height: 1.15;
  margin: 0 0 20px;
  max-width: 20ch;
  color: var(--ink);
}

.sub {
  font-size: 16px;
  line-height: 1.6;
  color: var(--n-700);
  max-width: 54ch;
  margin: 0 0 36px;
}

.sub em {
  font-style: italic;
}

.audit-form {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: end;
  margin-bottom: 12px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1 1 200px;
}

.field label {
  font-size: 12px;
  color: var(--n-500);
}

.field input {
  font-family: var(--font);
  font-size: 15px;
  padding: 11px 12px;
  border: 1px solid var(--n-300);
  background: var(--paper);
  color: var(--ink);
  border-radius: var(--radius-sm);
}

.field input:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 1px;
}

.audit-form button {
  font-family: var(--font);
  font-size: 15px;
  font-weight: 600;
  padding: 12px 22px;
  background: var(--ink);
  color: var(--paper);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  white-space: nowrap;
}

.audit-form button:hover { opacity: 0.85; }
.audit-form button:disabled { opacity: 0.5; cursor: default; }

.form-status {
  min-height: 20px;
  font-size: 14px;
  color: var(--n-700);
  margin-bottom: 8px;
}

.form-status.success { color: var(--ink); font-weight: 600; }
.form-status.error { color: var(--ink); font-weight: 600; }

.fine-print {
  font-size: 13px;
  color: var(--n-500);
  margin: 0;
}

.checks {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-top: 72px;
  padding-top: var(--space-4);
  border-top: 1px solid var(--n-200);
}

.check h2 {
  font-weight: 700;
  letter-spacing: -0.01em;
  font-size: 16px;
  margin: 0 0 8px;
  color: var(--ink);
}

.check p {
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--n-500);
  margin: 0;
}

.footer {
  margin-top: 72px;
  padding-top: var(--space-3);
  border-top: 1px solid var(--n-200);
  font-size: 13px;
  color: var(--n-500);
}

.footer a { color: var(--n-700); }

@media (max-width: 560px) {
  .hero h1 { font-size: 30px; }
  .checks { grid-template-columns: 1fr; gap: 24px; }
  .audit-form { flex-direction: column; align-items: stretch; }
}