:root{font-family:system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:light dark;color:#ffffffde;background-color:#242424;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a{font-weight:500;color:#646cff;text-decoration:inherit}a:hover{color:#535bf2}body{margin:0;display:flex;place-items:center;min-width:320px;min-height:100vh}h1{font-size:3.2em;line-height:1.1}button{border-radius:8px;border:1px solid transparent;padding:.6em 1.2em;font-size:1em;font-weight:500;font-family:inherit;background-color:#1a1a1a;cursor:pointer;transition:border-color .25s}button:hover{border-color:#646cff}button:focus,button:focus-visible{outline:4px auto -webkit-focus-ring-color}@media(prefers-color-scheme:light){:root{color:#213547;background-color:#fff}a:hover{color:#747bff}button{background-color:#f9f9f9}}*{box-sizing:border-box;margin:0;padding:0}.App{min-height:100vh;background-color:#f5f5f5}.App-header{background-color:#2c3e50;color:#fff;padding:2rem;text-align:center}.App-header h1{margin-bottom:1.5rem}.search-form{display:flex;gap:.5rem;max-width:600px;margin:0 auto}.search-input{flex:1;padding:.75rem;border:none;border-radius:4px;font-size:1rem}.search-button,.clear-button{padding:.75rem 1.5rem;border:none;border-radius:4px;font-size:1rem;cursor:pointer;transition:background-color .2s}.search-button{background-color:#3498db;color:#fff}.search-button:hover{background-color:#2980b9}.clear-button{background-color:#95a5a6;color:#fff}.clear-button:hover{background-color:#7f8c8d}.App{min-height:100vh;background-color:#f5f5f5;width:100%}.activities-container{width:calc(100% - 4rem);max-width:1400px;margin:0 auto;padding:2rem}.activities-grid{width:100%;display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1.5rem;margin-bottom:2rem}.activity-card{background:#fff;border-radius:8px;padding:1rem;box-shadow:0 2px 4px #0000001a;display:flex;flex-direction:column;height:100%}.activity-summary{margin-bottom:.75rem}.activity-title{font-size:1.1rem;color:#2c3e50;margin:0 0 .5rem;font-weight:600;line-height:1.3}.activity-meta{font-size:.85rem;line-height:1.5;color:#555}.activity-link{color:#3498db;text-decoration:none;word-break:break-all}.activity-link:hover{text-decoration:underline}.think-skills{color:#7f8c8d;font-style:italic}.video-container{position:relative;width:100%;padding-bottom:56.25%;height:0;overflow:hidden;margin:.75rem 0;border-radius:4px;background:#000;flex-shrink:0}.video-container iframe{position:absolute;top:0;left:0;width:100%;height:100%;border:none}.bitpaper-link{margin-top:auto;padding-top:.75rem;border-top:1px solid #ecf0f1;font-size:.85rem;color:#555}.skills-filter{background:#fff;padding:1.5rem;margin:0 auto;max-width:1400px;border-bottom:2px solid #ecf0f1}.skills-filter h3{color:#2c3e50;margin:0 0 1rem;font-size:1.2rem}.alphabet-nav{display:flex;flex-wrap:wrap;gap:.5rem;margin-bottom:1rem}.letter-btn{padding:.5rem .75rem;border:2px solid #3498db;background:#fff;color:#3498db;border-radius:4px;cursor:pointer;font-weight:600;transition:all .2s;min-width:40px}.letter-btn:hover,.letter-btn.active{background:#3498db;color:#fff}.letter-btn.clear-letter{border-color:#e74c3c;color:#e74c3c}.letter-btn.clear-letter:hover{background:#e74c3c;color:#fff}.skills-cloud{display:flex;flex-wrap:wrap;gap:.5rem;align-items:center}.skills-hint{width:100%;color:#7f8c8d;font-size:.9rem;margin-bottom:.5rem}.skill-tag{padding:.4rem .8rem;border:1px solid #bdc3c7;background:#ecf0f1;color:#2c3e50;border-radius:20px;cursor:pointer;font-size:.9rem;transition:all .2s;white-space:nowrap}.skill-tag:hover{background:#d5dbdb;border-color:#95a5a6}.skill-tag.active{background:#3498db;color:#fff;border-color:#2980b9}.skill-count{font-size:.8rem;opacity:.7}.pagination{display:flex;justify-content:center;align-items:center;gap:1rem;margin:2rem 0}.pagination button{padding:.5rem 1rem;border:none;border-radius:4px;background-color:#3498db;color:#fff;cursor:pointer;transition:background-color .2s}.pagination button:hover:not(:disabled){background-color:#2980b9}.pagination button:disabled{background-color:#bdc3c7;cursor:not-allowed}.error{color:#e74c3c;text-align:center;padding:1rem}@media(max-width:1024px){.activities-grid{grid-template-columns:repeat(auto-fill,minmax(280px,1fr))}}@media(max-width:768px){.App-header{padding:1rem}.App-header h1{font-size:1.5rem;margin-bottom:1rem}.search-form{flex-direction:column;width:100%}.search-input{width:100%}.activities-container{padding:1rem}.activities-grid{grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:1rem}.pagination{flex-wrap:wrap;gap:.5rem}}@media(max-width:480px){.activities-grid{grid-template-columns:1fr}.activity-title{font-size:1rem}.activity-meta{font-size:.8rem}}