/* Course projects and open challenges share one workshop catalog. */
.catalog-tabs { display:flex; gap:28px; margin:0 0 26px; border-bottom:1px solid #dce4ef; }
.catalog-tabs [role="tab"] { position:relative; min-height:48px; padding:12px 4px; border:0; background:transparent; color:#76849b; font:inherit; font-size:14px; cursor:pointer; }
.catalog-tabs [role="tab"][aria-selected="true"] { color:#2c60e9; font-weight:600; }
.catalog-tabs [role="tab"][aria-selected="true"]::after { content:""; position:absolute; bottom:-1px; left:0; right:0; height:3px; border-radius:3px 3px 0 0; background:#2c60e9; }
.catalog-tabs [role="tab"]:focus-visible { outline:2px solid #2c60e9; outline-offset:3px; }
#topics-view > [role="tabpanel"][hidden] { display:none!important; }
#course-catalog,#open-challenges,.catalog-challenge-group { scroll-margin-top:96px; }
.catalog-challenges { margin:0 0 28px; padding-top:0; }
.catalog-challenges-heading { display:flex; justify-content:space-between; align-items:flex-end; gap:16px; margin-bottom:20px; }
.catalog-challenges-heading h2 { margin:0 0 8px; font-size:22px; color:#172c48; }
.catalog-challenges-heading p { margin:0; font-size:12px; line-height:1.8; color:#76849b; }
.catalog-challenges-count { flex:none; font-size:12px; color:#76849b; }
.catalog-challenges-count strong { color:#315fda; }
.catalog-challenge-search { display:flex; gap:10px; margin-bottom:16px; }
.catalog-challenge-search input { flex:1; min-width:0; margin:0; padding:12px 14px; border:1px solid #dce5f4; border-radius:8px; background:#fff; font:inherit; font-size:13px; }
.catalog-challenge-search button { flex:none; padding:10px 20px; border:0; border-radius:8px; background:#2c60e9; color:#fff; font:inherit; font-size:13px; cursor:pointer; }
.catalog-challenge-filters { display:flex; flex-wrap:wrap; gap:8px; margin-bottom:24px; }
.catalog-challenge-filters button { min-height:38px; padding:8px 13px; border:1px solid #e1e7f1; border-radius:7px; background:#fff; color:#62718a; font:inherit; font-size:12px; cursor:pointer; }
.catalog-challenge-filters button[aria-pressed="true"] { border-color:#ccdafb; background:#edf3ff; color:#2c60e9; }
.catalog-challenges :is(a,button,input):focus-visible { outline:2px solid #2c60e9; outline-offset:3px; }
.catalog-challenge-group { margin-top:24px; }
.catalog-challenge-group>h3 { display:flex; align-items:center; gap:10px; margin:0 0 14px; font-size:15px; color:#263c58; }
.catalog-challenge-group>h3 span { font-weight:400; font-size:11px; color:#8493a9; }
.catalog-challenge-grid { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:16px; }
.catalog-challenge-card { display:flex; flex-direction:column; min-width:0; padding:24px; border:1px solid #e0e7f1; border-radius:12px; background:#fff; }
.catalog-challenge-meta { display:flex; justify-content:space-between; align-items:center; gap:12px; margin-bottom:16px; color:#8493a9; font-size:10px; letter-spacing:.04em; }
.catalog-challenge-status { padding:4px 9px; border-radius:5px; background:#f1f3f8; color:#6d7891; }
.catalog-challenge-status.is-ongoing { background:#edf6f3; color:#287e69; }
.catalog-challenge-card h4 { margin:0 0 7px; color:#172c48; font-size:17px; line-height:1.6; }
.catalog-challenge-card p { margin:0; }
.catalog-challenge-card .catalog-challenge-en { color:#8b99ac; font-size:11px; line-height:1.6; overflow-wrap:anywhere; }
.catalog-challenge-card .catalog-challenge-desc { margin-top:14px; font-size:13px; line-height:1.9; color:#62718a; }
.catalog-challenge-tags { display:flex; flex-wrap:wrap; gap:6px; margin:16px 0 20px; }
.catalog-challenge-tags span { padding:4px 8px; border-radius:5px; background:#f3f6fb; color:#607799; font-size:10px; }
.catalog-challenge-card dl { display:flex; justify-content:space-between; gap:14px; margin:auto 0 0; padding-top:16px; border-top:1px solid #edf0f5; }
.catalog-challenge-card dt { margin:0 0 5px; color:#94a0b1; font-size:10px; }
.catalog-challenge-card dd { margin:0; color:#526681; font-size:11px; }
.catalog-challenge-empty { padding:30px; border:1px dashed #d8e2f1; border-radius:10px; color:#76849b; text-align:center; }
.catalog-challenge-notice { margin:20px 0 0; color:#8997ab; font-size:11px; }
@media(max-width:1100px) { .catalog-challenge-grid { grid-template-columns:1fr; } }
@media(max-width:600px) { .catalog-challenges-heading { align-items:flex-start; flex-direction:column; } .catalog-challenge-card { padding:20px; } .catalog-challenge-search button { padding:10px 15px; } }