:root {
  color-scheme: light dark;
  --fg: #111;
  --fg-muted: #555;
  --bg: #fafafa;
  --accent: #0066cc;
  --ok: #157347;
  --bad: #a02020;
  --warn: #b37f00;
  --border: #ccc;
  --surface: #fff;
  font-family: system-ui, -apple-system, 'Segoe UI', sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #eee;
    --fg-muted: #aaa;
    --bg: #1a1a1a;
    --accent: #7ab8ff;
    --ok: #4caf50;
    --bad: #ff6b6b;
    --warn: #ffc066;
    --border: #444;
    --surface: #2a2a2a;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.5;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1rem 4rem;
}

h1 {
  font-size: 1.5rem;
  margin: 0 0 0.25rem;
}

h2 {
  font-size: 1rem;
  margin: 1.5rem 0 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--fg-muted);
}

.subtitle {
  margin: 0.25rem 0 0.75rem;
  color: var(--fg-muted);
}

.meta {
  font-size: 0.875rem;
  color: var(--fg-muted);
  margin: 0 0 1.5rem;
}

.hint {
  font-size: 0.875rem;
  color: var(--fg-muted);
  margin: 0.5rem 0;
}

a {
  color: var(--accent);
}

#drop-zone {
  border: 2px dashed var(--border);
  border-radius: 0.5rem;
  padding: 2rem;
  text-align: center;
  cursor: pointer;
  background: var(--surface);
  transition: border-color 120ms ease, background 120ms ease;
}

#drop-zone:focus-visible,
#drop-zone:hover {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

#drop-zone[data-drag-over='true'] {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, var(--surface));
}

#drop-zone[aria-invalid='true'] {
  border-color: var(--bad);
}

details#advanced {
  margin: 1.5rem 0;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  background: var(--surface);
}

details#advanced > summary {
  padding: 0.75rem 1rem;
  cursor: pointer;
}

.advanced-body {
  padding: 0 1rem 1rem;
}

.advanced-body label {
  display: block;
  margin-top: 0.5rem;
}

.advanced-body label > span {
  display: block;
  font-size: 0.875rem;
  color: var(--fg-muted);
  margin-bottom: 0.25rem;
}

.advanced-body input[type='url'] {
  width: 100%;
  padding: 0.5rem;
  font-family: inherit;
  font-size: 1rem;
  border: 1px solid var(--border);
  border-radius: 0.25rem;
  background: var(--bg);
  color: var(--fg);
}

#verdict {
  font-size: 1.25rem;
  font-weight: 600;
  padding: 0.75rem 1rem;
  border-radius: 0.5rem;
  margin: 0 0 1rem;
  border: 1px solid var(--border);
  background: var(--surface);
}

#verdict[data-verdict='pass'] {
  background: color-mix(in srgb, var(--ok) 12%, var(--surface));
  border-color: var(--ok);
  color: var(--ok);
}

#verdict[data-verdict='fail'] {
  background: color-mix(in srgb, var(--bad) 12%, var(--surface));
  border-color: var(--bad);
  color: var(--bad);
}

#verdict[data-verdict='partial'] {
  background: color-mix(in srgb, var(--warn) 12%, var(--surface));
  border-color: var(--warn);
  color: var(--warn);
}

#checks {
  list-style: none;
  padding: 0;
  margin: 0;
}

#checks li {
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--border);
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.75rem;
  align-items: baseline;
}

#checks li:last-child {
  border-bottom: none;
}

.status {
  font-weight: 600;
  font-size: 0.875rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.status[data-status='pass'] { color: var(--ok); }
.status[data-status='fail'] { color: var(--bad); }
.status[data-status='skip'] { color: var(--fg-muted); }

.check-name {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.9rem;
}

.check-details {
  font-size: 0.8125rem;
  color: var(--fg-muted);
  display: block;
  margin-top: 0.125rem;
}

footer {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-size: 0.875rem;
  color: var(--fg-muted);
}