:root {
  color-scheme: light;
  --bg: #f6f8fa;
  --panel: #ffffff;
  --text: #24292f;
  --muted: #57606a;
  --border: #d0d7de;
  --accent: #0969da;
  --error: #cf222e;
  --success: #1a7f37;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100svh;
  display: grid;
  place-items: center;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.45 -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

main {
  width: 100%;
  max-width: 760px;
  margin: 0 auto;
  padding: 32px 20px;
}

h1 {
  margin: 0 0 8px;
  font-size: 2rem;
  line-height: 1.15;
  letter-spacing: 0;
}

p {
  margin: 0;
  color: var(--muted);
}

.topbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.intro {
  min-width: 0;
}

form {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 24px 0 18px;
}

label {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

input[type="text"] {
  flex: 1 1 240px;
  min-width: 0;
  padding: 13px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
  color: var(--text);
  font: inherit;
}

input[type="text"]:focus {
  outline: 2px solid color-mix(in srgb, var(--accent) 20%, white);
  outline-offset: 1px;
  border-color: var(--accent);
}

button {
  appearance: none;
  border: 0;
  border-radius: 8px;
  background: var(--accent);
  color: white;
  padding: 13px 16px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.language-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-width: 58px;
  height: 40px;
  padding: 0 10px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  flex: 0 0 auto;
}

.language-button svg {
  width: 18px;
  height: 18px;
  stroke: currentColor;
}

.language-code {
  font-size: 0.86rem;
  font-weight: 700;
  line-height: 1;
}

.language-button:hover {
  border-color: var(--accent);
  color: var(--accent);
}

button:disabled {
  opacity: 0.75;
  cursor: wait;
}

section {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 18px 20px;
}

dl {
  display: grid;
  grid-template-columns: 170px 1fr;
  gap: 10px 16px;
  margin: 0;
}

dt {
  color: var(--muted);
}

dd {
  margin: 0;
  font-weight: 600;
  word-break: break-word;
}

.age-value {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  max-width: 100%;
  min-height: 28px;
}

.age-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  width: 28px;
  height: 28px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--panel);
  color: var(--muted);
}

.age-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.age-toggle svg {
  width: 15px;
  height: 15px;
  stroke: currentColor;
}

.status {
  min-height: 1.25em;
  margin: 14px 0 0;
  color: var(--muted);
}

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

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

.hidden {
  display: none;
}

.hint {
  margin-top: 12px;
  font-size: 0.92rem;
  color: var(--muted);
}

.footnote {
  margin-top: 14px;
  font-size: 0.8rem;
  line-height: 1.4;
  color: var(--muted);
  text-align: center;
}

@media (max-width: 520px) {
  main {
    padding: 28px 16px;
  }

  h1 {
    font-size: 1.6rem;
  }

  .topbar {
    align-items: center;
  }

  dl {
    grid-template-columns: 1fr;
    gap: 4px 0;
  }

  dt {
    margin-top: 10px;
  }
}