.topic-directory .section-head{align-items:start;gap:36px}
.topic-directory .section-head h2{font-size:clamp(34px,4.1vw,56px);line-height:1.1;max-width:720px}
.topic-directory .section-head>p{max-width:38ch;font-size:17px;line-height:1.65}
.topic-nav{display:flex;flex-wrap:wrap;gap:10px;margin:30px 0 34px}
.topic-nav a{display:inline-flex;align-items:center;gap:10px;min-height:44px;padding:10px 16px;border:1px solid var(--border);border-radius:6px;color:var(--paper);background:var(--card-bg);text-decoration:none;font-size:14px}
.topic-nav a>span{font-family:"JetBrains Mono",monospace;font-size:11px;color:var(--dim)}
.topic-nav a:hover{border-color:#9b78d7;background:rgba(142,104,211,.10)}
.topic-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.topic-card{min-width:0;padding:26px;border:1px solid var(--border);border-radius:10px;background:var(--card-bg);scroll-margin-top:105px;display:flex;flex-direction:column;position:relative}
.topic-card::before{content:"";position:absolute;left:26px;top:-1px;width:42px;height:2px;background:#9270cf}
.topic-card-meta{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:24px}
.topic-card-meta>span:last-child{font-size:12px;color:var(--dim)}
.topic-card h3{font-size:25px;line-height:1.2;letter-spacing:-.025em;margin:0 0 14px}
.topic-card>p{font-size:15px;line-height:1.65;margin:0 0 24px;color:var(--soft)}
.topic-card ul{list-style:none;padding:0;margin:0;border-top:1px solid var(--border)}
.topic-card li{padding:0;margin:0;border-bottom:1px solid var(--border)}
.topic-card li:last-child{border-bottom:0}
.topic-card li a{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 0;min-height:48px;font-size:14px;line-height:1.55;color:var(--paper);text-decoration:none;overflow-wrap:anywhere}
.topic-card li a:hover>span:first-child{text-decoration:underline;text-underline-offset:4px}
.topic-arrow{color:#9472cf;flex-shrink:0;font-size:19px}
.topic-directory a:focus-visible{outline:3px solid #9270cf;outline-offset:4px;border-radius:3px}
@media(max-width:1000px){.topic-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:650px){.topic-grid{grid-template-columns:minmax(0,1fr)}.topic-card{padding:22px}.topic-nav{gap:8px}.topic-nav a{padding:9px 12px}.topic-directory .section-head>p{max-width:none}.topic-card h3{font-size:26px}}

.compound-library .series-card{background:var(--card-bg)}