:root {
  --bg: #f7f8fa;
  --surface: #fff;
  --text: #1a1a2e;
  --muted: #5c6370;
  --accent: #0d4f8b;
  --accent-light: #e8f1fa;
  --border: #e2e6ea;
  --radius: 8px;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: 1100px; margin: 0 auto; padding: 0 1.25rem; }

.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 0;
  gap: 1rem;
  flex-wrap: wrap;
}
.brand { display: flex; flex-direction: column; }
.brand-name { font-size: 1.25rem; font-weight: 700; color: var(--text); text-decoration: none; }
.brand-sub { font-size: 0.8rem; color: var(--muted); }
.main-nav { display: flex; gap: 1.25rem; flex-wrap: wrap; font-size: 0.95rem; }
.main-nav a { color: var(--text); font-weight: 500; }

.main-content { padding: 2rem 0 3rem; min-height: 60vh; }

.hero-portal {
  background: linear-gradient(135deg, #0d4f8b 0%, #1a6bb5 100%);
  color: #fff;
  padding: 2.5rem 2rem;
  border-radius: var(--radius);
  margin-bottom: 2rem;
}
.hero-portal h1 { margin: 0 0 0.5rem; font-size: 2rem; }
.hero-desc { opacity: 0.92; max-width: 680px; margin-bottom: 1.25rem; }
.hero-actions { display: flex; gap: 0.75rem; flex-wrap: wrap; }
.btn {
  display: inline-block;
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius);
  background: rgba(255,255,255,0.15);
  color: #fff;
  border: 1px solid rgba(255,255,255,0.35);
  font-weight: 500;
}
.btn.primary { background: #fff; color: var(--accent); border-color: #fff; }
.btn:hover { text-decoration: none; opacity: 0.92; }

.layout-two-col {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 2rem;
}
@media (max-width: 800px) {
  .layout-two-col { grid-template-columns: 1fr; }
}

.section-title { font-size: 1.15rem; border-bottom: 2px solid var(--accent); padding-bottom: 0.35rem; }

.article-list { list-style: none; padding: 0; margin: 0; }
.article-list.compact li { padding: 0.35rem 0; border: none; }
.article-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 1rem;
  transition: box-shadow 0.15s;
}
.article-card:hover { box-shadow: 0 4px 12px rgba(0,0,0,0.06); }
.article-card a { display: block; padding: 1.1rem 1.25rem; color: inherit; text-decoration: none; }
.article-card h3 { margin: 0 0 0.4rem; font-size: 1.05rem; }
.article-card p { margin: 0 0 0.5rem; color: var(--muted); font-size: 0.92rem; }

.sidebar .widget {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.15rem;
  margin-bottom: 1rem;
}
.widget h3 { margin: 0 0 0.65rem; font-size: 0.95rem; color: var(--accent); }
.link-list { list-style: none; padding: 0; margin: 0; }
.link-list li { padding: 0.3rem 0; font-size: 0.9rem; }
.link-list.compact li { padding: 0.2rem 0; }

.lead { color: var(--muted); font-size: 1.05rem; }
.meta { color: var(--muted); font-size: 0.85rem; }
.breadcrumb { font-size: 0.88rem; color: var(--muted); margin-bottom: 1rem; }

.question-list { padding-left: 1.25rem; }
.question-list li { margin-bottom: 0.45rem; }

.hub-section { margin-bottom: 2.5rem; }
.hub-section h2 { margin-bottom: 0.25rem; }

.answer-block {
  background: var(--accent-light);
  border-left: 4px solid var(--accent);
  padding: 1.25rem 1.5rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 1.5rem 0;
}
.answer-first { font-size: 1.08rem; font-weight: 500; }
.placeholder { color: var(--muted); font-style: italic; }

.article-page header { margin-bottom: 1.5rem; }
.article-page h1 { font-size: 1.75rem; line-height: 1.35; }
.article-body { background: var(--surface); padding: 1.5rem; border-radius: var(--radius); border: 1px solid var(--border); }
.article-body h2 { font-size: 1.15rem; margin-top: 1.5rem; }

.brand-box {
  margin-top: 2rem;
  padding: 1.25rem;
  background: #fafbfc;
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  font-size: 0.92rem;
}

.tag-grid {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 0.75rem;
}
.tag-grid a {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 0.85rem 1rem;
  border-radius: var(--radius);
  color: var(--text);
  font-weight: 500;
}
.tag-grid a:hover { border-color: var(--accent); text-decoration: none; }

.info-table { width: 100%; border-collapse: collapse; background: var(--surface); }
.info-table th, .info-table td { border: 1px solid var(--border); padding: 0.65rem 0.85rem; text-align: left; }
.info-table th { background: var(--accent-light); width: 140px; }

.site-footer {
  background: #1a1a2e;
  color: #ccc;
  padding: 2rem 0;
  font-size: 0.88rem;
  margin-top: 2rem;
}
.footer-inner { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 1rem; }
.footer-links { display: flex; gap: 1rem; flex-wrap: wrap; }
.footer-links a { color: #aac4e0; }

code { background: #eee; padding: 0.1rem 0.35rem; border-radius: 3px; font-size: 0.88em; }

.haifeng-subnav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  margin-bottom: 1.5rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
  font-size: 0.92rem;
}
.haifeng-subnav a { color: var(--muted); font-weight: 500; }
.haifeng-subnav a.active { color: var(--accent); font-weight: 700; }

.honor-section { margin-bottom: 2.5rem; }
.honor-section h2 { font-size: 1.2rem; margin-bottom: 1rem; color: var(--accent); }
.honor-item { margin-bottom: 1.25rem; }
.honor-item h3 { font-size: 1rem; margin: 0 0 0.35rem; }

.honor-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 0.75rem;
  margin-top: 1rem;
}
.honor-gallery figure { margin: 0; }
.honor-gallery img {
  width: 100%;
  height: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}

.patent-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1rem;
}
.patent-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.patent-card img {
  width: 100%;
  height: auto;
  display: block;
  background: #fafafa;
}
.patent-meta { padding: 0.85rem 1rem; }
.patent-type {
  display: inline-block;
  background: var(--accent-light);
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  margin-right: 0.35rem;
}
.patent-number { font-size: 0.88rem; color: var(--muted); margin: 0.35rem 0; }

.standards-list { display: flex; flex-direction: column; gap: 1.25rem; }
.standard-card {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 1.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}
.standard-card img {
  width: 100%;
  height: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.standard-card h2 { margin: 0 0 0.25rem; font-size: 0.95rem; color: var(--accent); }
.standard-card h3 { margin: 0 0 0.5rem; font-size: 1.1rem; }
@media (max-width: 700px) {
  .standard-card { grid-template-columns: 1fr; }
}