.lera-dl{--blue: #0a5cab;--blue-dark: #084a8a;--blue-light: #e8f1fa;--ink: #1c2b3a;--gray: #5b6b7b;--line: #dde6ee;--bg: #f5f8fb;--shadow-sm: 0 2px 10px rgba(16, 60, 105, .06);--shadow-md: 0 12px 32px rgba(10, 92, 171, .14);background:var(--bg);color:var(--ink);line-height:1.6;font-family:Segoe UI,Helvetica Neue,Arial,PingFang SC,Microsoft YaHei,sans-serif;-webkit-font-smoothing:antialiased}.lera-dl a{text-decoration:none;color:inherit}.lera-dl *{box-sizing:border-box}.lera-dl .page-head{position:relative;overflow:hidden;background:linear-gradient(120deg,var(--blue-dark) 0%,var(--blue) 55%,#2a8fd8 100%);color:#fff;padding:58px 24px 96px}.lera-dl .page-head:before,.lera-dl .page-head:after{content:"";position:absolute;border-radius:50%;background:#ffffff12}.lera-dl .page-head:before{width:420px;height:420px;top:-180px;right:-80px}.lera-dl .page-head:after{width:300px;height:300px;bottom:-160px;left:12%}.lera-dl .page-head-inner{max-width:1180px;margin:0 auto;position:relative;z-index:1}.lera-dl .crumbs{font-size:12px;color:#bcd8f2;margin-bottom:14px;letter-spacing:1.5px;text-transform:uppercase}.lera-dl .page-head h1{font-size:36px;letter-spacing:.5px;margin:0;font-weight:700}.lera-dl .page-head p{margin-top:10px;max-width:780px;color:#dcebfa;font-size:15px}.lera-dl .head-stats{display:flex;gap:14px;margin-top:26px;flex-wrap:wrap}.lera-dl .head-stat{background:#ffffff1f;border:1px solid rgba(255,255,255,.22);border-radius:10px;padding:10px 20px;font-size:13px;color:#eaf4fd}.lera-dl .head-stat b{font-size:19px;display:block;line-height:1.25;color:#fff}.lera-dl .wrap{max-width:1180px;margin:0 auto;padding:0 24px 80px}.lera-dl .cat-grid-view{transform:translateY(-56px)}.lera-dl .cat-grid-view.hidden{display:none}.lera-dl .cat-grid{display:grid;grid-template-columns:repeat(3,1fr);grid-auto-rows:1fr;gap:22px 20px}.lera-dl .cat-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:24px 22px 18px;cursor:pointer;position:relative;overflow:hidden;transition:box-shadow .2s ease,transform .2s ease,border-color .2s ease;display:flex;flex-direction:column;gap:10px;text-align:left;width:100%;font:inherit;color:inherit}.lera-dl .cat-card:before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg,var(--ac, var(--blue)),var(--ac2, #2a8fd8));transform:scaleX(0);transform-origin:left;transition:transform .25s ease}.lera-dl .cat-card:hover{box-shadow:var(--shadow-md);transform:translateY(-4px);border-color:#bcd4ea}.lera-dl .cat-card:hover:before{transform:scaleX(1)}.lera-dl .cat-icon{width:52px;height:52px;border-radius:12px;background:var(--ac-soft, var(--blue-light));color:var(--ac, var(--blue));display:flex;align-items:center;justify-content:center;transition:background .2s ease,color .2s ease}.lera-dl .cat-card:hover .cat-icon{background:var(--ac, var(--blue));color:#fff}.lera-dl .cat-icon svg{width:26px;height:26px}.lera-dl .cat-card h3{font-size:18px;margin:0;font-weight:700}.lera-dl .cat-card p{font-size:13.5px;color:var(--gray);flex:1;margin:0;display:-webkit-box;-webkit-line-clamp:4;-webkit-box-orient:vertical;overflow:hidden}.lera-dl .cat-meta{display:flex;justify-content:space-between;align-items:center;border-top:1px dashed var(--line);padding-top:12px;margin-top:4px}.lera-dl .cat-count{font-size:12.5px;color:var(--gray)}.lera-dl .cat-count b{color:var(--ac, var(--blue));font-size:15px}.lera-dl .cat-open{font-size:13px;font-weight:600;color:var(--ac, var(--blue));transition:transform .2s ease}.lera-dl .cat-card:hover .cat-open{transform:translate(4px)}.lera-dl .section-view{display:none;padding-top:40px}.lera-dl .section-view.active{display:block;animation:lera-dl-fadeUp .3s ease}@keyframes lera-dl-fadeUp{0%{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}.lera-dl .section-top{display:flex;align-items:flex-start;gap:18px;margin-bottom:20px}.lera-dl .back-btn{flex:none;margin-top:4px;background:#fff;border:1px solid var(--line);color:var(--blue);padding:9px 16px;border-radius:9px;font-size:14px;font-weight:600;cursor:pointer;transition:background .15s ease,border-color .15s ease}.lera-dl .back-btn:hover{background:var(--blue-light);border-color:#bcd4ea}.lera-dl .section-icon{flex:none;width:56px;height:56px;border-radius:13px;background:linear-gradient(135deg,var(--ac, var(--blue)),var(--ac2, #2a8fd8));color:#fff;display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow-sm)}.lera-dl .section-icon svg{width:28px;height:28px}.lera-dl .section-top h2{font-size:27px;margin:0;font-weight:700}.lera-dl .section-top .desc{color:var(--gray);font-size:14.5px;margin-top:4px;max-width:860px}.lera-dl .toolbar{display:flex;justify-content:flex-end;margin-bottom:18px}.lera-dl .search-box{position:relative;width:320px;max-width:100%}.lera-dl .search-box svg{position:absolute;left:13px;top:50%;transform:translateY(-50%);width:16px;height:16px;color:#93a7bb;pointer-events:none}.lera-dl .search-box input{width:100%;padding:11px 16px 11px 38px;border:1px solid var(--line);border-radius:10px;font-size:14px;background:#fff;color:var(--ink);outline:none;transition:border-color .15s ease,box-shadow .15s ease}.lera-dl .search-box input:focus{border-color:var(--blue);box-shadow:0 0 0 3px #0a5cab1f}.lera-dl .search-box input::placeholder{color:#93a7bb}.lera-dl .dl-list{display:flex;flex-direction:column;gap:16px}.lera-dl .dl-item{background:#fff;border:1px solid var(--line);border-radius:14px;display:flex;gap:22px;padding:16px;transition:box-shadow .16s ease,border-color .16s ease,transform .16s ease;animation:lera-dl-fadeUp .35s ease both}.lera-dl .dl-item:hover{border-color:#bcd4ea;box-shadow:0 8px 24px #0a5cab1a;transform:translateY(-2px)}.lera-dl .dl-thumb{flex:none;width:190px;height:128px;border-radius:10px;overflow:hidden;background:#eef3f8;border:1px solid var(--line)}.lera-dl .dl-thumb img{width:100%;height:100%;object-fit:cover;object-position:center;transition:transform .3s ease;display:block}.lera-dl .dl-item:hover .dl-thumb img{transform:scale(1.04)}.lera-dl .dl-body{flex:1;min-width:0;display:flex;flex-direction:column}.lera-dl .dl-name{font-size:17px;font-weight:700}.lera-dl .dl-desc{font-size:13.5px;color:var(--gray);margin-top:5px;flex:1}.lera-dl .dl-tags{display:flex;gap:8px;margin-top:11px;flex-wrap:wrap;align-items:center}.lera-dl .tag{font-size:11.5px;padding:3px 10px;border-radius:999px;background:var(--blue-light);color:var(--blue);font-weight:600}.lera-dl .tag.plain{background:#eef2f6;color:var(--gray);font-weight:500}.lera-dl .tag.fmt{font-weight:700;letter-spacing:.3px}.lera-dl .tag.fmt.pdf{background:#fdecec;color:#c0392b}.lera-dl .tag.fmt.img{background:#e8f6ec;color:#1e8449}.lera-dl .tag.fmt.zip{background:#f0eafc;color:#6c4bb6}.lera-dl .tag.fmt.exe{background:#fdf0e3;color:#b9770e}.lera-dl .tag.fmt.cad{background:#e3f0fb;color:#1b6fae}.lera-dl .tag.fmt.video{background:#fceaf3;color:#b03a71}.lera-dl .tag.fmt.audio{background:#eaf2fd;color:#2a6fb0}.lera-dl .tag.fmt.doc{background:#e8f1fd;color:#1a5276}.lera-dl .tag.fmt.file{background:#eef2f6;color:var(--gray)}.lera-dl .fmt-more{font-size:11px;color:#dcebfa;font-weight:700}.lera-dl .dl-action{flex:none;display:flex;align-items:center}.lera-dl .btn-dl{display:inline-flex;align-items:center;gap:8px;background:var(--blue);color:#fff;border:none;cursor:pointer;padding:11px 20px;border-radius:9px;font-size:14px;font-weight:700;transition:background .15s ease,box-shadow .15s ease;white-space:nowrap}.lera-dl .btn-dl:hover{background:var(--blue-dark);box-shadow:0 4px 14px #0a5cab47}.lera-dl .btn-dl svg{width:16px;height:16px}.lera-dl .empty-tip{text-align:center;color:var(--gray);background:#fff;border:2px dashed #c9d8e6;border-radius:14px;padding:48px 24px;font-size:14px;line-height:2}.lera-dl .note{margin-top:26px;background:#fff8ea;border:1px solid #f0e0b0;border-radius:10px;padding:13px 18px;font-size:13px;color:#7a6420}@media(max-width:1024px){.lera-dl .cat-grid{grid-template-columns:repeat(2,1fr)}}@media(max-width:720px){.lera-dl .cat-grid{grid-template-columns:1fr;gap:16px}.lera-dl .cat-card{padding:20px 18px 16px}.lera-dl .dl-item{flex-direction:column}.lera-dl .dl-thumb{width:100%;height:190px}.lera-dl .dl-action{justify-content:flex-start}.lera-dl .page-head{padding-bottom:84px}.lera-dl .section-top{flex-wrap:wrap}}