:root {
  --bg: #0f172a;
  --panel: #ffffff;
  --panel-muted: #f1f5f9;
  --text: #0f172a;
  --muted: #64748b;
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --good: #16a34a;
  --warn: #d97706;
  --bad: #dc2626;
  --radius: 12px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  background: linear-gradient(180deg, #0f172a 0%, #1e293b 220px, #f1f5f9 220px, #f1f5f9 100%);
  color: var(--text);
  min-height: 100vh;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 20px 10px;
  color: white;
  max-width: 760px;
  margin: 0 auto;
}

.brand { display: flex; align-items: center; gap: 14px; }
.brand-icon { font-size: 2rem; }
.topbar h1 { margin: 0; font-size: 1.3rem; }
.subtitle { margin: 2px 0 0; color: #cbd5e1; font-size: 0.9rem; }

.icon-btn {
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.2);
  color: white;
  border-radius: 8px;
  padding: 8px 10px;
  cursor: pointer;
  font-size: 1rem;
}

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 20px 16px 60px;
}

.card {
  background: var(--panel);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 18px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
}

.card h2 { margin-top: 0; font-size: 1.05rem; }

.field { margin-bottom: 14px; }
.field label { display: block; font-size: 0.85rem; font-weight: 600; margin-bottom: 6px; color: #334155; }

input[type="text"], input[type="url"], select, textarea {
  width: 100%;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid #cbd5e1;
  font-size: 0.95rem;
  font-family: inherit;
}

textarea { resize: vertical; }

.preview-wrap { margin-top: 12px; }
.preview-wrap img, .preview-wrap video { max-width: 100%; border-radius: 8px; display: block; }
.hidden { display: none !important; }

.link-btn {
  background: none;
  border: none;
  color: var(--accent);
  cursor: pointer;
  padding: 6px 0;
  font-size: 0.85rem;
  text-decoration: underline;
}

.hint { color: var(--muted); font-size: 0.82rem; margin: 6px 0 0; }

.actions {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 18px;
}

.primary-btn {
  background: var(--accent);
  color: white;
  border: none;
  padding: 12px 22px;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
}
.primary-btn:hover { background: var(--accent-dark); }
.primary-btn:disabled { opacity: 0.6; cursor: not-allowed; }

.status-text { color: var(--muted); font-size: 0.9rem; }

.result-card { border: 2px solid var(--accent); }
.result-header { display: flex; justify-content: space-between; align-items: center; }
.badge {
  background: var(--panel-muted);
  color: var(--muted);
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.confidence { margin: 6px 0 14px; font-size: 0.85rem; font-weight: 600; }
.confidence.high { color: var(--good); }
.confidence.medium { color: var(--warn); }
.confidence.low { color: var(--bad); }

#resultBody h3 { margin-bottom: 6px; font-size: 0.95rem; }
#resultBody ul { margin-top: 4px; padding-left: 20px; }
#resultBody li { margin-bottom: 6px; line-height: 1.4; }
.safety-note {
  background: #fef2f2;
  border-left: 4px solid var(--bad);
  padding: 10px 14px;
  border-radius: 6px;
  margin-top: 14px;
  font-size: 0.88rem;
}

.kb-browser select { cursor: pointer; }

footer {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 16px 40px;
  color: var(--muted);
  font-size: 0.78rem;
  text-align: center;
}

dialog {
  border: none;
  border-radius: 12px;
  padding: 22px;
  max-width: 420px;
  width: 90%;
}
dialog::backdrop { background: rgba(15,23,42,0.5); }
dialog h3 { margin-top: 0; }
dialog menu { display: flex; justify-content: flex-end; gap: 10px; padding: 0; margin-top: 16px; }
dialog button { padding: 8px 16px; border-radius: 8px; border: 1px solid #cbd5e1; background: white; cursor: pointer; }
#saveSettingsBtn { background: var(--accent); color: white; border-color: var(--accent); }