:root {
  --bg: #f4f4f5;
  --fg: #18181b;
  --muted: #71717a;
  --card: #ffffff;
  --border: #e4e4e7;
  --accent: #18181b;
  --accent-fg: #fafafa;
  --ok: #166534;
  --err: #b91c1c;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.06), 0 8px 24px rgba(0, 0, 0, 0.06);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #18181b;
    --fg: #fafafa;
    --muted: #a1a1aa;
    --card: #27272a;
    --border: #3f3f46;
    --accent: #fafafa;
    --accent-fg: #18181b;
    --ok: #86efac;
    --err: #fca5a5;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--fg);
  font-size: 15px;
  line-height: 1.45;
}

.screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.card {
  width: 100%;
  max-width: 420px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: 28px 24px;
}

h1 {
  margin: 0 0 8px;
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.lead {
  margin: 0 0 20px;
  color: var(--muted);
  font-size: 0.9rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 14px;
}

.field span {
  font-size: 0.8rem;
  color: var(--muted);
}

select,
button {
  font: inherit;
  width: 100%;
  border-radius: 8px;
}

select {
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--fg);
  padding: 10px 12px;
}

button {
  margin-top: 6px;
  border: 0;
  background: var(--accent);
  color: var(--accent-fg);
  padding: 11px 14px;
  font-weight: 550;
  cursor: pointer;
}

button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

button:not(:disabled):hover {
  filter: brightness(1.08);
}

.status {
  min-height: 1.4em;
  margin: 14px 0 0;
  font-size: 0.9rem;
}

.status.ok {
  color: var(--ok);
}

.status.err {
  color: var(--err);
}

.hint {
  margin: 10px 0 0;
  font-size: 0.78rem;
  color: var(--muted);
}