:root {
  --bg: #f7f9fc; --card-bg: #fff; --text: #1a1a2e;
  --text-light: #555; --border: #e0e4e8;
  --accent: #1a5276; --accent-light: #3498db;
  --accent-bg: #eaf2f8;
  --radius: 10px; --shadow: 0 2px 8px rgba(0,0,0,0.05);
  --header-bg: #1a1a2e; --header-text: #fff;
}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:-apple-system,BlinkMacSystemFont,"Noto Sans SC","PingFang SC",sans-serif;background:var(--bg);color:var(--text);line-height:1.7;min-height:100vh;display:flex;flex-direction:column}
.site-header{background:var(--header-bg);color:var(--header-text);padding:0 2rem;height:56px;display:flex;align-items:center;position:sticky;top:0;z-index:100}
.header-inner{max-width:1200px;margin:0 auto;width:100%;display:flex;justify-content:space-between;align-items:center}
.logo{font-size:1.3rem;font-weight:700;color:var(--header-text);text-decoration:none}
.logo span{font-weight:300;opacity:0.7;margin-left:4px}
.main-nav{display:flex;gap:1.5rem}
.main-nav a{color:rgba(255,255,255,0.7);text-decoration:none;font-size:0.92rem;padding:0.25rem 0;border-bottom:2px solid transparent;transition:all 0.2s}
.main-nav a:hover,.main-nav a.active{color:var(--header-text);border-bottom-color:var(--accent-light)}
main{flex:1;max-width:1200px;margin:0 auto;padding:2rem 1.5rem;width:100%}
.page-header{text-align:center;margin-bottom:2rem}
.page-header h1{font-size:2rem;color:var(--header-bg)}
.subtitle{color:var(--text-light);font-size:1.05rem}
.hero{text-align:center;padding:3rem 1rem;background:linear-gradient(135deg,#1a1a2e,#16213e);color:#fff;border-radius:var(--radius);margin-bottom:2rem}
.hero h1{font-size:2.2rem;margin-bottom:0.5rem}
.hero p{opacity:0.8}
.quick-nav{display:flex;flex-wrap:wrap;gap:0.5rem;justify-content:center;margin-bottom:2rem}
.quick-nav a{padding:0.4rem 1rem;background:var(--card-bg);border:1px solid var(--border);border-radius:20px;color:var(--accent);text-decoration:none;font-size:0.9rem;transition:all 0.15s}
.quick-nav a:hover{background:var(--accent);color:#fff}
.domain-section{margin-bottom:2.5rem}
.domain-section h2{font-size:1.4rem;color:var(--header-bg);margin-bottom:1rem}
.domain-section h2 span{font-size:0.85rem;color:var(--text-light);font-weight:normal;margin-left:0.5rem}
.model-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:1rem}
.model-grid.small{grid-template-columns:repeat(auto-fill,minmax(200px,1fr))}
.model-card{display:block;background:var(--card-bg);border-radius:var(--radius);padding:1.3rem;box-shadow:var(--shadow);text-decoration:none;color:var(--text);transition:all 0.2s;border:1px solid transparent;position:relative}
.model-card:hover{border-color:var(--accent-light);transform:translateY(-2px);box-shadow:0 6px 20px rgba(0,0,0,0.08)}
.model-card-number{position:absolute;top:0.8rem;right:1rem;font-size:1.3rem;font-weight:700;color:var(--accent-light);opacity:0.4}
.model-card h3{font-size:1.05rem;margin-bottom:0.4rem;color:var(--header-bg)}
.model-card p{font-size:0.85rem;color:var(--text-light);margin-bottom:0.8rem}
.model-card-meta{display:flex;gap:0.8rem;font-size:0.78rem;color:var(--accent-light)}
.model-detail{max-width:800px;margin:0 auto}
.back-link{display:inline-block;color:var(--accent);text-decoration:none;font-size:0.9rem;margin-bottom:1rem}
.domain-badge{display:inline-block;font-size:0.85rem;color:var(--accent);background:var(--accent-bg);padding:0.2rem 0.8rem;border-radius:12px;margin-right:0.5rem}
.definition-card{background:linear-gradient(135deg,#eaf2f8,#f0f4f8);border-left:4px solid var(--accent);padding:1.5rem;border-radius:0 var(--radius) var(--radius) 0;margin-bottom:1.5rem}
.definition-card p{font-size:1.05rem;line-height:1.9}
.model-meta-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem;margin-bottom:2rem}
.meta-card{text-align:center;background:var(--card-bg);padding:1rem;border-radius:var(--radius);box-shadow:var(--shadow)}
.meta-value{font-size:1.5rem;font-weight:700;color:var(--accent)}
.meta-label{font-size:0.8rem;color:var(--text-light);margin-top:0.2rem}
.evolution-timeline{position:relative;padding-left:2rem}
.timeline-item{position:relative;padding-bottom:1rem;border-left:2px solid var(--border)}
.timeline-dot{position:absolute;left:-6px;top:5px;width:10px;height:10px;background:var(--accent);border-radius:50%}
.timeline-content{margin-left:1rem}
.tl-year{font-weight:600;color:var(--accent);margin-right:0.5rem}
.tl-title{font-size:0.9rem;color:var(--accent);text-decoration:none;transition:color 0.15s}
.tl-title:hover{color:var(--accent-light);text-decoration:underline}
blockquote{background:var(--card-bg);border-left:3px solid var(--accent-light);padding:0.8rem 1.2rem;margin:0.8rem 0;border-radius:0 var(--radius) var(--radius) 0;font-size:0.92rem;color:#555}
.article-refs{list-style:none;display:flex;flex-direction:column;gap:0.5rem}
.article-refs li{padding:0.5rem 1rem;background:var(--card-bg);border-radius:6px;display:flex;justify-content:space-between;align-items:center}
.art-title{font-size:0.92rem;color:var(--accent);text-decoration:none;transition:color 0.15s}
.art-title:hover{color:var(--accent-light);text-decoration:underline}
a.art-title{flex:1}
.art-year{font-size:0.82rem;color:var(--text-light);flex-shrink:0;margin-left:1rem}
.related-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:0.5rem}
.related-model{display:flex;justify-content:space-between;padding:0.6rem 1rem;background:var(--card-bg);border-radius:6px;text-decoration:none;color:var(--text);border:1px solid var(--border);transition:all 0.15s}
.related-model:hover{border-color:var(--accent-light);background:var(--accent-bg)}
.rm-domain{font-size:0.78rem;color:var(--text-light)}
.model-list{display:flex;flex-direction:column;gap:0.4rem}
.model-list-item{display:flex;justify-content:space-between;align-items:center;padding:0.7rem 1rem;background:var(--card-bg);border-radius:6px;text-decoration:none;color:var(--text);box-shadow:0 1px 3px rgba(0,0,0,0.04)}
.model-list-item:hover{background:var(--accent-bg)}
.model-name{font-weight:500}
.model-articles,.model-years{font-size:0.82rem;color:var(--text-light)}
.scenario-section{margin-bottom:2.5rem}
.scenario-section h2{font-size:1.3rem;color:var(--header-bg);margin-bottom:0.3rem}
.scenario-desc{color:var(--text-light);font-size:0.9rem;margin-bottom:1rem}
.graph-page{max-width:1000px;margin:0 auto}
#graph-container{width:100%;height:70vh;background:var(--card-bg);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
.graph-legend{display:flex;gap:1.5rem;justify-content:center;margin-top:1rem;flex-wrap:wrap}
.legend-item{display:flex;align-items:center;gap:0.4rem;font-size:0.85rem;color:var(--text-light)}
.legend-dot{width:10px;height:10px;border-radius:50%}
.site-footer{text-align:center;padding:2rem;color:var(--text-light);font-size:0.85rem;margin-top:auto}
.credit{font-size:0.78rem;opacity:0.7;margin-top:0.3rem}
@media(max-width:768px){.model-grid{grid-template-columns:1fr}.model-meta-grid{grid-template-columns:repeat(3,1fr)}.hero h1{font-size:1.6rem}}