:root {
  color-scheme: light;
  --text: #1f2328;
  --muted: #656d76;
  --border: #d0d7de;
  --surface: #ffffff;
  --subtle: #f6f8fa;
  --primary: #0969da;
  --primary-hover: #0759b8;
  --error: #cf222e;
  --success: #1a7f37;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  background: var(--surface);
  font-size: 16px;
  line-height: 1.6;
}

button,
input {
  font: inherit;
}

.page-shell {
  width: min(640px, calc(100% - 40px));
  margin: 0 auto;
  padding: 56px 0 32px;
}

.hero {
  margin-bottom: 32px;
}

h1 {
  margin: 0;
  font-size: 2rem;
  line-height: 1.25;
}

.hero-copy {
  margin: 10px 0 0;
  color: var(--muted);
}

.lookup {
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
}

.lookup > h2 {
  margin: 0 0 20px;
  font-size: 1.25rem;
  line-height: 1.4;
}

.lookup-form label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
}

.input-row {
  display: flex;
  gap: 10px;
}

input {
  min-width: 0;
  height: 42px;
  flex: 1;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  outline: none;
  color: var(--text);
  background: var(--surface);
  font-variant-numeric: tabular-nums;
}

input:focus {
  border-color: var(--primary);
  outline: 2px solid rgba(9, 105, 218, 0.2);
  outline-offset: 1px;
}

button {
  min-width: 112px;
  height: 42px;
  padding: 0 18px;
  border: 1px solid var(--primary);
  border-radius: 6px;
  color: #ffffff;
  background: var(--primary);
  font-weight: 600;
  cursor: pointer;
}

button:hover:not(:disabled) {
  border-color: var(--primary-hover);
  background: var(--primary-hover);
}

button:focus-visible {
  outline: 2px solid rgba(9, 105, 218, 0.35);
  outline-offset: 2px;
}

button:disabled {
  cursor: wait;
  opacity: 0.7;
}

.button-loading {
  display: none;
}

button.is-loading .button-label {
  display: none;
}

button.is-loading .button-loading {
  display: inline;
}

.hint,
.status {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.875rem;
}

.status {
  min-height: 1.5em;
}

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

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

.result {
  margin-top: 20px;
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--subtle);
}

.identity {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 18px;
  align-items: center;
}

.avatar {
  width: 96px;
  height: 96px;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--surface);
  object-fit: cover;
}

.match-label {
  margin: 0 0 4px;
  color: var(--primary);
  font-size: 0.8125rem;
  font-weight: 600;
}

.result h2 {
  margin: 0;
  font-size: 1.375rem;
  line-height: 1.4;
}

.description {
  margin: 6px 0 0;
  color: var(--muted);
}

.metadata {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 20px 0 0;
}

.metadata div {
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

dt {
  color: var(--muted);
  font-size: 0.8125rem;
}

dd {
  margin: 4px 0 0;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  overflow-wrap: anywhere;
}

footer {
  margin-top: 24px;
  color: var(--muted);
  font-size: 0.8125rem;
  text-align: center;
}

footer p {
  margin: 0;
}

@media (max-width: 540px) {
  .page-shell {
    width: min(100% - 24px, 640px);
    padding-top: 32px;
  }

  h1 {
    font-size: 1.75rem;
  }

  .lookup {
    padding: 20px 16px;
  }

  .input-row {
    flex-direction: column;
  }

  button {
    width: 100%;
  }

  .identity {
    grid-template-columns: 72px minmax(0, 1fr);
    gap: 14px;
  }

  .avatar {
    width: 72px;
    height: 72px;
  }

  .metadata {
    grid-template-columns: 1fr;
    gap: 12px;
  }
}