:root {
  --brand: #fd5104;
  --brand-ink: #b83a00;
  --ink: #141b25;
  --muted: #4a5565;
  --line: #d9dee5;
  --bg: #f4f6f8;
  --card: #ffffff;
  --danger: #b42318;
  --danger-ink: #ffffff;
  --focus: #1d4ed8;
  --error-bg: #fdecea;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --ink: #eef1f5;
    --muted: #b4bdc9;
    --line: #2c3542;
    --bg: #0e1116;
    --card: #161b22;
    --brand-ink: #ff8a50;
    --danger: #e5484d;
    --error-bg: #3a1c1c;
    --focus: #8ab4ff;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", "Noto Sans Devanagari", sans-serif;
}
.card {
  max-width: 480px;
  margin: 0 auto;
  padding: 20px 16px 40px;
  background: var(--card);
  min-height: 100vh;
}
@media (min-width: 520px) {
  .card { margin: 32px auto; min-height: 0; border-radius: 16px; border: 1px solid var(--line); padding: 28px 28px 36px; }
}
.brand { border-top: 4px solid var(--brand); padding-top: 16px; margin-bottom: 8px; }
.brand img { height: 40px; width: auto; display: block; }
h1 { font-size: 1.5rem; line-height: 1.25; margin: 12px 0 16px; }
h2 { font-size: 1.05rem; margin: 20px 0 6px; }
p { margin: 0 0 12px; }
label { display: block; font-weight: 600; margin: 20px 0 6px; }
input[type="tel"], input[type="text"] {
  width: 100%;
  min-height: 48px;
  padding: 10px 12px;
  font-size: 1.1rem;
  color: var(--ink);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
}
#code { letter-spacing: 0.3em; font-variant-numeric: tabular-nums; }
button {
  font: inherit;
  cursor: pointer;
  border-radius: 10px;
}
button.primary, button.danger, button.secondary {
  display: block;
  width: 100%;
  min-height: 48px;
  margin-top: 16px;
  padding: 10px 16px;
  font-weight: 600;
  border: 0;
}
button.primary { background: var(--brand); color: #ffffff; }
button.danger { background: var(--danger); color: var(--danger-ink); }
button.secondary { background: transparent; color: var(--ink); border: 1px solid var(--line); }
button.link {
  background: none;
  border: 0;
  padding: 12px 0;
  min-height: 44px;
  color: var(--brand-ink);
  font-weight: 600;
  text-decoration: underline;
}
button:disabled { opacity: 0.55; cursor: not-allowed; }
button[aria-busy="true"] { opacity: 0.75; cursor: progress; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
/* Headings take focus only so screen readers announce the new step; they are not controls. */
[tabindex="-1"]:focus { outline: none; }
.row { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px; }
.check { display: flex; gap: 10px; align-items: flex-start; margin: 20px 0 4px; font-weight: 400; }
.check input { width: 22px; height: 22px; margin: 2px 0 0; flex: none; }
.note { color: var(--muted); }
.error {
  margin-top: 16px;
  padding: 12px;
  border-radius: 10px;
  background: var(--error-bg);
  color: var(--ink);
  border-left: 4px solid var(--danger);
}
[hidden] { display: none !important; }