:root {
  --bg: #f6f8fa;
  --card: #ffffff;
  --text: #1f2328;
  --muted: #656d76;
  --accent: #0969da;
  --border: #d0d7de;
  --error: #cf222e;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 1rem 1.5rem;
  background: var(--card);
  border-bottom: 1px solid var(--border);
}

header h1 { margin: 0; font-size: 1.25rem; }
.header-actions { display: flex; gap: 0.5rem; align-items: center; }

.filters {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  flex-wrap: wrap;
}

.filters select:disabled { color: var(--muted); }

main {
  max-width: 760px;
  margin: 1.5rem auto;
  padding: 0 1rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem;
}

label { display: block; font-weight: 600; margin-bottom: 0.25rem; }

input {
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 1rem;
  margin-bottom: 0.75rem;
}

button {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 0.5rem 1rem;
  font-size: 1rem;
  cursor: pointer;
}

button:hover { filter: brightness(0.92); }
button.ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.error { color: var(--error); }
.hint { color: var(--muted); font-size: 0.875rem; }

details { margin-top: 1rem; }
details summary { cursor: pointer; font-weight: 600; }
details ol { padding-left: 1.25rem; }

.report {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem 2rem;
}

.report h1 { font-size: 1.5rem; border-bottom: 1px solid var(--border); padding-bottom: 0.5rem; }
.report h2 { font-size: 1.15rem; margin-top: 1.75rem; color: var(--accent); }
.report a { color: var(--accent); word-break: break-all; }
.report p { margin: 0.75rem 0; }

select {
  padding: 0.35rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--card);
  font-size: 0.9rem;
}