.lch-wrapper{color:#f1f5f9;background-color:#0c0e14;flex-direction:column;min-height:100vh;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;display:flex}.lch-main{box-sizing:border-box;flex:1;width:100%;max-width:1200px;margin:0 auto;padding:3rem 1.5rem 5rem}.lch-hero{text-align:center;margin-bottom:3.5rem;position:relative}.lch-hero-logo-wrap{justify-content:center;align-items:center;margin-bottom:1.5rem;display:flex}.lch-hero-logo{object-fit:contain;filter:drop-shadow(0 0 30px #f59e0b73);border-radius:12px;width:88px;height:88px;transition:transform .3s cubic-bezier(.4,0,.2,1),filter .3s}.lch-hero-logo:hover{filter:drop-shadow(0 0 45px #f59e0ba6);transform:scale(1.08)rotate(2deg)}.lch-badge{color:#38bdf8;text-transform:uppercase;letter-spacing:1px;background:#38bdf81a;border:1px solid #38bdf840;border-radius:9999px;align-items:center;gap:.5rem;margin-bottom:1.25rem;padding:.4rem 1rem;font-size:.82rem;font-weight:700;display:inline-flex}.lch-title{letter-spacing:-1px;color:#fff;margin:0 0 1.2rem;font-size:3rem;font-weight:900;line-height:1.15}.lch-title-gradient{background:linear-gradient(135deg,#38bdf8 0%,#818cf8 50%,#c084fc 100%);-webkit-text-fill-color:transparent;-webkit-background-clip:text}.lch-subtitle{color:#94a3b8;max-width:650px;margin:0 auto 2rem;font-size:1.15rem;line-height:1.6}.lch-stats-row{flex-wrap:wrap;justify-content:center;gap:2rem;display:flex}.lch-stat-card{background:#ffffff08;border:1px solid #ffffff14;border-radius:14px;flex-direction:column;align-items:center;padding:1rem 1.75rem;display:flex}.lch-stat-num{color:#38bdf8;font-size:1.6rem;font-weight:800}.lch-stat-label{color:#64748b;text-transform:uppercase;letter-spacing:.5px;margin-top:.2rem;font-size:.8rem}.lch-section-header{border-bottom:1px solid #1e2433;justify-content:space-between;align-items:center;margin-bottom:1.5rem;padding-bottom:.75rem;display:flex}.lch-section-title{color:#fff;align-items:center;gap:.6rem;margin:0;font-size:1.4rem;font-weight:700;display:flex}.lch-view-more-link{color:#38bdf8;align-items:center;gap:.4rem;font-size:.92rem;font-weight:600;text-decoration:none;transition:all .2s;display:inline-flex}.lch-view-more-link:hover{color:#7dd3fc;transform:translate(3px)}.lch-problems-grid{flex-direction:column;gap:.85rem;margin-bottom:2.5rem;display:flex}.lch-prob-row{color:inherit;background:#141721;border:1px solid #232838;border-radius:12px;justify-content:space-between;align-items:center;gap:1rem;padding:1rem 1.5rem;text-decoration:none;transition:all .2s cubic-bezier(.4,0,.2,1);display:flex}.lch-prob-row:hover{background:#1a1e2b;border-color:#38bdf8;transform:translateY(-2px);box-shadow:0 10px 25px -5px #0f172a66,0 0 20px -5px #38bdf826}.lch-prob-left{flex:1;align-items:center;gap:1.25rem;display:flex}.lch-prob-id{color:#64748b;text-align:right;flex-shrink:0;width:32px;font-family:monospace;font-size:1rem;font-weight:700}.lch-prob-info{flex-direction:column;gap:.35rem;display:flex}.lch-prob-title{color:#f1f5f9;margin:0;font-size:1.05rem;font-weight:600;transition:color .2s}.lch-prob-row:hover .lch-prob-title{color:#38bdf8}.lch-prob-tags{flex-wrap:wrap;gap:.4rem;display:flex}.lch-prob-tag{color:#94a3b8;background:#ffffff0d;border-radius:4px;padding:.15rem .5rem;font-size:.72rem}.lch-prob-right{flex-shrink:0;align-items:center;gap:1.25rem;display:flex}.lch-diff-badge{text-transform:capitalize;border-radius:9999px;padding:.25rem .65rem;font-size:.75rem;font-weight:600}.lch-diff-easy{color:#00b8a3;background:#00b8a31f;border:1px solid #00b8a340}.lch-diff-medium{color:#ffc01e;background:#ffc01e1f;border:1px solid #ffc01e40}.lch-diff-hard{color:#ff375f;background:#ff375f1f;border:1px solid #ff375f40}.lch-solve-btn{color:#38bdf8;background:#38bdf81f;border:1px solid #38bdf84d;border-radius:8px;align-items:center;gap:.4rem;padding:.45rem 1rem;font-size:.85rem;font-weight:600;transition:all .2s;display:inline-flex}.lch-prob-row:hover .lch-solve-btn{color:#0c0e14;background:#38bdf8;border-color:#38bdf8}.lch-view-all-cta{text-align:center;background:radial-gradient(circle,#38bdf81f 0%,#141721cc 100%);border:1px solid #232838;border-radius:16px;padding:2.5rem}.lch-cta-btn{color:#fff;background:linear-gradient(135deg,#38bdf8 0%,#2563eb 100%);border-radius:12px;align-items:center;gap:.6rem;padding:.85rem 2rem;font-size:1rem;font-weight:700;text-decoration:none;transition:all .2s;display:inline-flex;box-shadow:0 10px 25px -5px #38bdf866}.lch-cta-btn:hover{transform:translateY(-2px);box-shadow:0 15px 30px -5px #38bdf88c}@media (max-width:768px){.lch-title{font-size:2.2rem}.lch-prob-row{flex-direction:column;align-items:flex-start}.lch-prob-right{border-top:1px solid #1e2433;justify-content:space-between;width:100%;margin-top:.5rem;padding-top:.5rem}}