:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --text: #1b1f24;
  --muted: #5b6470;
  --accent: #5b2a86;
  --accent-text: #ffffff;
  --border: #c9ced6;
  --success-bg: #e6f6ec;
  --success-text: #0f5132;
  --error-bg: #fdecec;
  --error-text: #8a1c1c;
  --focus: #1a73e8;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121418;
    --card: #1c2027;
    --text: #e8eaed;
    --muted: #a3acb8;
    --accent: #b388eb;
    --accent-text: #15081f;
    --border: #3a414b;
    --success-bg: #12301e;
    --success-text: #9fe3b8;
    --error-bg: #3a1616;
    --error-text: #f5b5b5;
    --focus: #8ab4f8;
  }
}

* {
  box-sizing: border-box;
}

html {
  font-size: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: start center;
  padding: 1rem;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.45;
}

.card {
  width: 100%;
  max-width: 28rem;
  background: var(--card);
  border-radius: 0.75rem;
  padding: 1.5rem;
  box-shadow: 0 2px 12px rgb(0 0 0 / 8%);
}

h1 {
  margin: 0 0 0.5rem;
  font-size: 1.5rem;
}

h2 {
  margin: 0 0 0.5rem;
  font-size: 1.25rem;
}

.date {
  margin: 0 0 1.5rem;
  color: var(--muted);
}

.date time {
  display: block;
  color: var(--text);
  font-weight: 600;
}

label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.375rem;
}

input {
  width: 100%;
  min-height: 3rem;
  font: inherit;
  font-size: 1.125rem;
  padding: 0.625rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  background: var(--card);
  color: var(--text);
}

.hint {
  margin: 0.375rem 0 1.25rem;
  color: var(--muted);
  font-size: 0.9375rem;
}

button {
  width: 100%;
  min-height: 3rem;
  font: inherit;
  font-size: 1.125rem;
  font-weight: 600;
  border: 0;
  border-radius: 0.5rem;
  background: var(--accent);
  color: var(--accent-text);
  cursor: pointer;
}

button:disabled {
  opacity: 0.6;
  cursor: progress;
}

button.secondary {
  margin-top: 1rem;
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.result {
  margin-top: 1.25rem;
  padding: 1rem;
  border-radius: 0.5rem;
}

.result.success {
  background: var(--success-bg);
  color: var(--success-text);
}

.result.error,
.error {
  background: var(--error-bg);
  color: var(--error-text);
}

.result p {
  margin: 0;
}