:root {
  --bg: #fbfaf7;
  --surface: #ffffff;
  --text: #1d1d1b;
  --muted: #5f5d57;
  --border: #d9d6cd;
  --accent: #2f5d8a;
  --accent-text: #ffffff;
  --danger: #a3332b;
  --ok: #2d6a3e;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161614;
    --surface: #1f1f1c;
    --text: #ecebe6;
    --muted: #a6a39b;
    --border: #3a3934;
    --accent: #8db4dc;
    --accent-text: #10202f;
    --danger: #f08a80;
    --ok: #8fd19e;
  }
}

* {
  box-sizing: border-box;
}
body {
  margin: 0 auto;
  max-width: 42rem;
  padding: 0 16px 32px;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}
header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  padding: 24px 0 8px;
}
h1 {
  margin: 0;
  font-size: 1.6rem;
}
h2 {
  font-size: 1.2rem;
  margin: 0 0 8px;
}
h3 {
  font-size: 1rem;
  margin: 20px 0 4px;
}
header p {
  margin: 4px 0 0;
  color: var(--muted);
}
main > * + * {
  margin-top: 20px;
}
.privacy {
  padding: 12px 14px;
  border-left: 4px solid var(--ok);
  background: var(--surface);
  border-radius: 4px;
}
.hint {
  color: var(--muted);
  font-size: 0.9rem;
  margin: 4px 0 0;
}
form {
  display: grid;
  gap: 16px;
}
.drop {
  display: grid;
  gap: 4px;
  justify-items: center;
  padding: 28px 16px;
  border: 2px dashed var(--border);
  border-radius: 8px;
  background: var(--surface);
  text-align: center;
  cursor: pointer;
  overflow-wrap: anywhere;
}
.drop:hover,
.drop.over,
.drop:focus-within {
  border-color: var(--accent);
}
.drop input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}
.field {
  display: grid;
  gap: 4px;
}
label {
  font-weight: 600;
}
select,
button,
.button {
  font: inherit;
  border-radius: 6px;
  border: 1px solid var(--border);
  padding: 8px 12px;
  min-height: 44px;
}
select {
  width: 100%;
  background: var(--surface);
  color: var(--text);
}
button,
.button {
  background: var(--accent);
  color: var(--accent-text);
  border-color: var(--accent);
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
}
button.quiet {
  background: transparent;
  color: var(--accent);
}
button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}
:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}
.actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
progress {
  width: 100%;
  height: 12px;
  accent-color: var(--accent);
}
#error h2 {
  color: var(--danger);
}
#error-detail,
#checks {
  overflow-wrap: anywhere;
}
dl {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 4px 16px;
  margin: 12px 0 16px;
}
dt {
  color: var(--muted);
}
dd {
  margin: 0;
  overflow-wrap: anywhere;
}
ol,
ul {
  padding-left: 1.4rem;
}
details {
  margin-top: 16px;
}
summary {
  cursor: pointer;
  color: var(--accent);
}
#checks {
  font-size: 0.9rem;
  color: var(--muted);
}
footer {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  margin-top: 40px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.85rem;
}
a {
  color: var(--accent);
}
[hidden] {
  display: none !important;
}

.preview {
  display: grid;
  gap: 12px;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}
.preview h3 {
  margin: 0;
}
.preview-search {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.preview-options {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.preview-options > :first-child {
  flex: 1 1 20rem;
}
.preview-options > :last-child {
  flex: 0 0 12rem;
}
.preview-search input {
  flex: 1 1 12rem;
  min-width: 0;
}
.preview input {
  min-height: 44px;
  font: inherit;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  color: var(--text);
}
.preview-stage {
  display: grid;
  justify-items: center;
}
.preview-frame {
  display: block;
  max-width: 100%;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #fff;
}
.preview-page {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #fff;
}
.preview-canvas {
  display: block;
  width: 100%;
  height: auto;
}
.preview-links {
  position: absolute;
  inset: 0;
}
.preview .preview-link {
  position: absolute;
  min-height: 0;
  padding: 0;
  border: 0;
  border-radius: 2px;
  background: transparent;
}
.preview .preview-link:hover {
  outline: 2px solid var(--accent);
}
.preview-pager {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 24px;
}
.preview-pager > div {
  display: flex;
  align-items: center;
  gap: 8px;
}
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}