.index-head{padding:40px 0 28px}.concept-library-head .eyebrow{margin-bottom:10px}.index-head.concept-library-head h1{margin-top:0}.index-head h1{font:700 30px/1.3 var(--serif);margin:0 0 22px}.sr-only{clip-path:inset(50%);white-space:nowrap;width:1px;height:1px;position:absolute;overflow:hidden}.concept-search-control{background:var(--card);border:1px solid #9dbbad;border-radius:14px;gap:12px;padding:8px;display:flex}.concept-search-control:focus-within{outline:2px solid var(--green);outline-offset:3px}.concept-search input{min-width:0;color:var(--ink);font:inherit;background:0 0;border:0;outline:none;flex:1;padding:14px 16px;font-size:20px}.concept-search button{background:var(--green);color:#fff;font:inherit;cursor:pointer;border:0;border-radius:8px;padding:14px 32px;font-weight:700}.concept-index{padding-bottom:64px}.concept-filter-panel{text-align:right}.concept-filters{text-align:left;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;padding:16px 0;display:grid}.filter-field{gap:6px;min-width:0;display:grid}.filter-field label{color:var(--muted);font-size:13px}.filter-field select{border:1px solid var(--line);background:var(--card);width:100%;min-height:44px;color:var(--ink);font:inherit;border-radius:8px;padding:8px}.category-section{padding:0 0 28px;scroll-margin-top:90px}.category-section>header{align-items:center;gap:10px;margin-bottom:12px;display:flex}.category-section h2{margin:0;font-size:16px}.index-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;display:grid}.index-card{border:1px solid var(--line);background:var(--card);border-radius:10px;justify-content:space-between;align-items:center;gap:12px;min-height:60px;padding:14px 18px;text-decoration:none;display:flex}.index-card h3{overflow-wrap:anywhere;margin:0;font-size:16px;font-weight:600}.index-card>span{color:var(--muted);font-size:14px}.index-card:hover{background:#edf4ef;border-color:#9dbbad}.index-card[hidden],.category-section[hidden],.filter-empty[hidden]{display:none}.filter-empty{padding:24px 0}.filter-empty h2{font-size:20px}.filter-empty p{color:var(--muted)}.filter-empty button{border:1px solid var(--line);font:inherit;background:var(--card);cursor:pointer;border-radius:8px;padding:10px 16px}.concept-index a:focus-visible,.concept-index summary:focus-visible,.concept-index select:focus-visible,.concept-search button:focus-visible{outline:2px solid var(--green);outline-offset:3px}@media (width<=900px){.index-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}@media (width<=560px){.index-head{padding:28px 0 24px}.index-head h1{margin-bottom:18px;font-size:26px}.concept-search-control{border-radius:12px;gap:4px;padding:6px}.concept-search input{padding:12px 6px;font-size:16px}.concept-search button{padding:12px 16px}.index-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.index-card{min-height:56px;padding:12px}.index-card h3{font-size:15px}.concept-filters{grid-template-columns:1fr 1fr}}.concept-index{padding-top:30px}.category-section{padding:36px 0 18px}.category-section>header{align-items:flex-end;margin-bottom:18px}.category-section h2{font:700 30px/1.25 var(--serif)}.category-section header p{color:var(--muted);margin:5px 0 0;font-size:14px}.index-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.index-card{border-radius:14px;flex-direction:column;justify-content:flex-start;align-items:stretch;min-height:190px;padding:20px 22px;display:flex}.index-card-tags{min-height:23px}.index-card h3{font:700 22px/1.35 var(--serif);margin:18px 0 8px}.index-card p{color:var(--muted);margin:0 0 18px;line-height:1.65}.index-card>b{color:var(--green);margin-top:auto;font-size:13px}.level-chip,.start-chip{color:#56616b;background:#eef0f2;border-radius:20px;padding:3px 8px;font-size:11px;display:inline-block}.start-chip{color:#9a5d13;background:#f7ead7;margin-left:6px}.index-card:hover{transform:translateY(-2px);box-shadow:0 10px 24px #174a3815}@media (width<=900px){.index-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (width<=560px){.concept-index{padding-top:18px}.category-section{padding:28px 0 12px}.category-section h2{font-size:26px}.index-grid{grid-template-columns:1fr;gap:10px}.index-card{min-height:0;padding:18px}.index-card h3{margin-top:12px;font-size:22px}.index-card p{margin-bottom:14px;font-size:14px}}