/* OpenTrojan 全局基础样式（中性、简洁） */
:root {
  --bg: #f5f7fb;
  --text: #1a202c;
  --muted: #64748b;
  --brand: #2563eb;
  --border: #e2e8f0;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  background: linear-gradient(180deg, #eef3fb 0%, var(--bg) 30%);
  color: var(--text);
  line-height: 1.6;
}

header {
  border-bottom: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.9);
}

nav {
  display: flex;
  gap: 1rem;
  align-items: center;
  max-width: 1080px;
  margin: 0 auto;
  padding: 0.75rem 1rem;
  flex-wrap: wrap;
}

nav a {
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
}

nav a:hover {
  color: var(--brand);
}

main {
  max-width: 1080px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

footer {
  border-top: 1px solid var(--border);
  text-align: center;
  padding: 1.5rem;
  color: var(--muted);
  font-size: 0.875rem;
}

h1 {
  font-size: 2rem;
  margin-top: 0;
}

article header h1 {
  margin-bottom: 0.25rem;
}

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

.meta span {
  margin-right: 0.75rem;
}

.summary {
  font-size: 1.05rem;
  color: #334155;
}

.ai-answer {
  background: #eef6ff;
  border: 1px solid #bfdbfe;
  border-left: 4px solid var(--brand);
  padding: 0.75rem 1rem;
  border-radius: 6px;
  margin: 1rem 0;
}

.ai-answer h2,
.definition h2,
.related h2,
.references h2 {
  margin: 0 0 0.25rem;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--muted);
}

.definition {
  border: 1px solid var(--border);
  padding: 0.75rem 1rem;
  border-radius: 6px;
  margin: 1rem 0;
  background: #fff;
}

.content img {
  max-width: 100%;
}

.related,
.references {
  margin-top: 1.5rem;
}

.related ul,
.references ul,
.content-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.related li,
.references li,
.content-list li {
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border);
}

.related a,
.references a,
.content-list a {
  color: var(--brand);
  text-decoration: none;
  font-weight: 500;
}

.related a:hover,
.references a:hover,
.content-list a:hover {
  text-decoration: underline;
}

.related .type {
  color: var(--muted);
  font-size: 0.8rem;
  margin-left: 0.4rem;
}

.content-list .desc {
  display: block;
  color: var(--muted);
  font-size: 0.9rem;
}

.hero {
  padding: 1.5rem 0 1rem;
}

.hero p {
  max-width: 720px;
  font-size: 1.1rem;
}

.sections {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}

.card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem 1.25rem;
}

.card h2 {
  margin: 0 0 0.25rem;
  font-size: 1.1rem;
}

.card h2 a {
  color: var(--text);
  text-decoration: none;
}

.card h2 a:hover {
  color: var(--brand);
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.latest h2 {
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.5rem;
}

/* CVE / severity badges（Phase 1B） */
.badge {
  display: inline-block;
  padding: 0.15rem 0.6rem;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  background: #e2e8f0;
  color: #334155;
}

.badge-sm {
  font-size: 0.75rem;
}

.sev-critical {
  background: #fee2e2;
  color: #b91c1c;
}

.sev-high {
  background: #ffedd5;
  color: #c2410c;
}

.cve-article .vector,
.cve-article .affected code,
.cve-article .impact code {
  display: inline-block;
  background: #f1f5f9;
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  font-size: 0.9rem;
}

.cve-article section h2,
.malware-intel h2 {
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.3rem;
  font-size: 1.1rem;
}

.malware-intel {
  margin: 1.5rem 0;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.75rem 1.25rem;
}

.malware-intel li {
  margin-left: 1.25rem;
}