:root {
  --bg: #0e1116;
  --surface: #171b22;
  --surface-2: #222834;
  --stroke: #2e3645;
  --accent: #3b82f6;
  --accent-dark: #2563eb;
  --text: #f3f5f8;
  --text-2: #9aa4b2;
  --danger: #f87171;
}

* { box-sizing: border-box; }

html, body { margin: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.page {
  max-width: 560px;
  margin: 0 auto;
  padding: 32px 16px 48px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 24px;
}

.brand h1 { margin: 0; font-size: 1.5rem; }
.brand p { margin: 2px 0 0; color: var(--text-2); }

.card {
  background: var(--surface);
  border-radius: 16px;
  padding: 20px;
  margin-bottom: 16px;
}

label {
  display: block;
  color: var(--text-2);
  font-size: 0.9rem;
  margin-bottom: 8px;
}

input {
  width: 100%;
  min-height: 52px;
  padding: 0 16px;
  font: inherit;
  color: var(--text);
  background: var(--surface-2);
  border: 1px solid var(--stroke);
  border-radius: 12px;
}

input:focus {
  outline: none;
  border: 2px solid var(--accent);
  padding: 0 15px;
}

button {
  width: 100%;
  min-height: 50px;
  margin-top: 12px;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  border: 0;
  border-radius: 12px;
  cursor: pointer;
}

button:hover { background: var(--accent-dark); }
button:focus-visible { outline: 3px solid #fff; outline-offset: 2px; }
button:disabled { opacity: 0.6; cursor: wait; }

button.secondary {
  background: var(--surface-2);
  border: 1px solid var(--stroke);
}

button.secondary:hover { background: #2c3443; }

.error {
  color: var(--danger);
  margin: 12px 0 0;
}

.hint {
  color: var(--text-2);
  font-size: 0.875rem;
  margin: 14px 0 0;
}

.result { text-align: center; }
.result-label { margin: 0; color: var(--text-2); }

.code {
  margin: 8px 0 16px;
  font: 700 3.5rem/1.1 ui-monospace, "SF Mono", Menlo, monospace;
  letter-spacing: 0.25em;
  padding-left: 0.25em; /* balances letter-spacing on the last digit */
  color: var(--text);
}

.steps {
  text-align: left;
  color: var(--text-2);
  margin: 0 auto;
  padding-left: 1.25em;
  max-width: 380px;
}

.steps strong { color: var(--text); }

footer {
  color: var(--text-2);
  font-size: 0.875rem;
  text-align: center;
  margin-top: 32px;
}

footer p { margin: 4px 0; }

a { color: #93c5fd; }

/* Privacy / 404 pages */
.doc h2 { font-size: 1.15rem; margin: 28px 0 8px; }
.doc p, .doc li { color: var(--text-2); }
.doc ul { padding-left: 1.25em; }

@media (max-width: 400px) {
  .code { font-size: 2.75rem; }
}