:root{--sx-blue:#1c6eff;--sx-blue-dark:#0b4fd1;--sx-blue-light:#4c8dff;--sx-blue-50:#eef4ff;--sx-blue-100:#dce7ff;--sx-orange:#ff8a00;--sx-orange-dark:#ff6a00;--sx-green:#12b886;--sx-purple:#7048e8;--sx-text:#1a1a1a;--sx-text-2:#5c6270;--sx-text-3:#8a8f9c;--sx-text-4:#b4b8c2;--sx-border:#eceef1;--sx-border-2:#e2e4e9;--sx-bg:#f5f6f7;--sx-bg-2:#f7f8fa;--sx-radius:8px;--sx-radius-lg:12px;--sx-shadow:0 2px 12px rgba(0,0,0,0.06);--sx-shadow-hover:0 6px 24px rgba(28,110,255,0.14);--sx-container:1400px;--sx-header-h:60px}*{box-sizing:border-box;padding:0;margin:0}.sx-cover-img{object-fit:cover;display:block}.sx-cover-img,.sx-cover-ph{position:absolute;inset:0;width:100%;height:100%}.sx-cover-ph{overflow:hidden;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:9px;color:#fff}.sx-cover-ph-deco{position:absolute;width:72%;aspect-ratio:1;border-radius:50%;border:1px solid rgba(255,255,255,.16);top:-34%;right:-18%;box-shadow:0 0 0 26px rgba(255,255,255,.05),0 0 0 54px rgba(255,255,255,.03);pointer-events:none}.sx-cover-ph-label{font-size:12px;font-weight:600;letter-spacing:.5px;opacity:.95}.sx-cover-ph-brand{position:absolute;bottom:9px;right:11px;font-size:9.5px;opacity:.65;letter-spacing:.5px}.sx-cover-ph.compact{gap:5px}.sx-cover-ph.compact .sx-cover-ph-label{font-size:9.5px}body,html{font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Microsoft YaHei,Helvetica Neue,Arial,sans-serif;color:var(--sx-text);background:#fff;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button{font-family:inherit;cursor:pointer;border:none;background:none}input,select,textarea{font-family:inherit;font-size:inherit;outline:none}img{display:block;max-width:100%}ol,ul{list-style:none}.sx-container{max-width:var(--sx-container);margin:0 auto;padding:0 24px}.sx-header{position:-webkit-sticky;position:sticky;top:0;z-index:100;background:rgba(255,255,255,.97);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--sx-border)}.sx-header-inner{max-width:var(--sx-container);margin:0 auto;padding:0 24px;height:var(--sx-header-h);gap:32px}.sx-header-inner,.sx-logo{display:flex;align-items:center}.sx-logo{gap:9px;font-size:17px;font-weight:800;color:var(--sx-blue);flex-shrink:0;letter-spacing:-.2px}.sx-logo-mark{width:28px;height:28px;border-radius:7px;background:linear-gradient(135deg,var(--sx-blue),var(--sx-blue-dark));display:grid;place-items:center;color:#fff;font-size:14px;font-weight:800}.sx-nav{gap:4px;flex:1 1}.sx-nav,.sx-nav-item{display:flex;align-items:center}.sx-nav-item{padding:0 14px;height:var(--sx-header-h);font-size:14px;color:var(--sx-text-2);position:relative;transition:color .15s;white-space:nowrap}.sx-nav-item.active,.sx-nav-item:hover{color:var(--sx-blue)}.sx-nav-item.active{font-weight:600}.sx-nav-item.active:after{content:"";position:absolute;bottom:0;left:14px;right:14px;height:2.5px;background:var(--sx-blue);border-radius:2px}.sx-header-right{gap:12px;flex-shrink:0}.sx-header-right,.sx-searchbar{display:flex;align-items:center}.sx-searchbar{max-width:620px;flex:1 1;border:1.5px solid var(--sx-blue);border-radius:19px;overflow:hidden;background:#fff;transition:box-shadow .15s}.sx-searchbar:focus-within{box-shadow:0 0 0 3px rgba(28,110,255,.1)}.sx-searchbar input{flex:1 1;border:none;padding:7px 15px;font-size:13px;background:transparent;min-width:0}.sx-searchbar input::placeholder{color:var(--sx-text-4)}.sx-searchbar button{background:var(--sx-blue);color:#fff;padding:7px 20px;font-size:13px;transition:background .15s;flex-shrink:0}.sx-searchbar button:hover{background:var(--sx-blue-dark)}.sx-hot-words{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.sx-hot-word{font-size:12px;color:var(--sx-text-2);background:var(--sx-bg-2);padding:4px 11px;border-radius:12px;transition:all .15s}.sx-hot-word:hover{color:var(--sx-blue);background:var(--sx-blue-50)}.sx-banner-strip{margin:12px 0;background:linear-gradient(100deg,#0b4fd1,#1c6eff 55%,#4c8dff);border-radius:var(--sx-radius-lg);padding:16px 26px;display:flex;align-items:center;gap:22px;color:#fff}.sx-banner-strip-title{font-size:16px;font-weight:700;white-space:nowrap}.sx-banner-pills{display:flex;gap:10px;flex-wrap:wrap}.sx-pill{background:rgba(255,255,255,.2);padding:5px 13px;border-radius:13px;font-size:12px}.sx-btn,.sx-pill{white-space:nowrap}.sx-btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:8px 22px;border-radius:17px;font-size:13px;font-weight:600;transition:all .15s}.sx-btn-primary{background:var(--sx-blue);color:#fff}.sx-btn-primary:hover{background:var(--sx-blue-dark);transform:translateY(-1px);box-shadow:0 4px 14px rgba(28,110,255,.3)}.sx-btn-white{background:#fff;color:var(--sx-blue)}.sx-btn-ghost{border:1px solid var(--sx-border-2);color:var(--sx-text-2)}.sx-btn-ghost:hover{border-color:var(--sx-blue);color:var(--sx-blue)}.sx-main-grid{display:grid;grid-template-columns:216px minmax(0,1fr) 240px;grid-gap:16px;gap:16px;align-items:start;padding-bottom:40px}.sx-cat-tree{border:1px solid var(--sx-border);border-radius:var(--sx-radius-lg);overflow:hidden;position:-webkit-sticky;position:sticky;top:calc(var(--sx-header-h) + 16px)}.sx-cat-tree-head{padding:11px 14px;font-size:13.5px;font-weight:700;color:var(--sx-blue)}.sx-cat-group,.sx-cat-tree-head{border-bottom:1px solid var(--sx-border)}.sx-cat-group:last-child{border-bottom:none}.sx-cat-parent{display:flex;align-items:center;justify-content:space-between;padding:10px 14px;font-size:13px;cursor:pointer;transition:background .15s;color:var(--sx-text)}.sx-cat-parent.open,.sx-cat-parent:hover{background:var(--sx-blue-50);color:var(--sx-blue)}.sx-cat-parent.open{font-weight:600}.sx-cat-arrow{font-size:10px;color:var(--sx-text-4);transition:transform .2s}.sx-cat-parent.open .sx-cat-arrow{transform:rotate(90deg)}.sx-cat-children{display:none;padding:2px 0 6px}.sx-cat-children.open{display:block}.sx-cat-child{display:block;padding:6px 14px 6px 26px;font-size:12.5px;color:var(--sx-text-2);transition:all .15s}.sx-cat-child:hover{color:var(--sx-blue);background:var(--sx-blue-50)}.sx-card{background:#fff;border:1px solid var(--sx-border);border-radius:var(--sx-radius-lg);overflow:hidden}.sx-card-hover{transition:all .2s}.sx-card-hover:hover{box-shadow:var(--sx-shadow-hover);transform:translateY(-2px);border-color:transparent}.sx-cover{position:relative;aspect-ratio:16/10;background:linear-gradient(135deg,var(--sx-blue-100),#f0f5ff);overflow:hidden}.sx-cover img{width:100%;height:100%;object-fit:cover;transition:transform .35s}.sx-card-hover:hover .sx-cover img{transform:scale(1.05)}.sx-cover-badge{position:absolute;top:8px;left:8px;background:rgba(0,0,0,.55);color:#fff;font-size:11px;padding:2px 8px;border-radius:10px;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.sx-cover-duration,.sx-cover-lessons{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.62);color:#fff;font-size:11px;padding:2px 7px;border-radius:4px}.sx-card-body{padding:10px 12px 12px}.sx-card-title{font-size:13.5px;font-weight:600;line-height:1.45;color:var(--sx-text);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-height:39px;transition:color .15s}.sx-card-hover:hover .sx-card-title{color:var(--sx-blue)}.sx-card-meta{display:flex;align-items:center;gap:9px;margin-top:7px;font-size:11.5px;color:var(--sx-text-3)}.sx-card-meta .sx-rating{color:var(--sx-orange)}.sx-card-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));grid-gap:12px;gap:12px}.sx-section-head{display:flex;align-items:center;gap:10px;margin-bottom:12px}.sx-section-title{font-size:16px;font-weight:700;position:relative;padding-left:11px}.sx-section-title:before{content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);width:3.5px;height:15px;background:var(--sx-blue);border-radius:2px}.sx-section-more{margin-left:auto;font-size:12.5px;color:var(--sx-text-3);transition:color .15s}.sx-section-more:hover{color:var(--sx-blue)}.sx-rank{display:flex;gap:12px}.sx-rank-top{flex:1.15 1;border-radius:var(--sx-radius);padding:14px;color:#fff;background:linear-gradient(135deg,var(--sx-blue),var(--sx-blue-dark));min-height:150px;display:flex;flex-direction:column}.sx-rank-top.orange{background:linear-gradient(135deg,#ff8a00,#ff6a00)}.sx-rank-tag{align-self:flex-start;background:rgba(255,255,255,.22);font-size:10.5px;padding:2px 8px;border-radius:9px;margin-bottom:8px}.sx-rank-title{font-size:14px;font-weight:700;line-height:1.45;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.sx-rank-meta{margin-top:auto;font-size:11.5px;opacity:.85;padding-top:8px}.sx-rank-list{flex:1 1;display:flex;flex-direction:column;gap:7px}.sx-rank-item{display:flex;align-items:center;gap:8px;background:var(--sx-bg-2);border-radius:var(--sx-radius);padding:9px 11px;font-size:12.5px;transition:all .15s}.sx-rank-item:hover{background:var(--sx-blue-50)}.sx-rank-num{width:17px;height:17px;border-radius:4px;background:var(--sx-text-4);color:#fff;font-size:11px;font-weight:700;display:grid;place-items:center;flex-shrink:0}.sx-rank-item:first-child .sx-rank-num{background:#ff4d4f}.sx-rank-item:nth-child(2) .sx-rank-num{background:#ff7d45}.sx-rank-item:nth-child(3) .sx-rank-num{background:#ffa940}.sx-path-tabs{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));grid-gap:9px;gap:9px;margin-bottom:13px}.sx-path-tab{border-radius:var(--sx-radius);padding:11px 13px;background:var(--sx-bg-2);border:1.5px solid transparent;transition:all .2s;text-align:left}.sx-path-tab:hover{border-color:var(--sx-blue)}.sx-path-tab.active{background:linear-gradient(135deg,var(--sx-blue),var(--sx-blue-dark));color:#fff;box-shadow:0 4px 14px rgba(28,110,255,.24)}.sx-path-no{font-size:11px;opacity:.7}.sx-path-name{font-size:13.5px;font-weight:700;margin-top:2px}.sx-path-count{font-size:11.5px;opacity:.75;margin-top:2px}.sx-tools{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));grid-gap:10px;gap:10px}.sx-tool{border:1px solid var(--sx-border);border-radius:var(--sx-radius);padding:14px 10px;text-align:center;transition:all .2s}.sx-tool:hover{border-color:var(--sx-blue);box-shadow:var(--sx-shadow);transform:translateY(-2px)}.sx-tool-icon{font-size:21px;margin-bottom:7px}.sx-tool-name{font-size:12.5px;font-weight:600}.sx-tool-desc{font-size:11px;color:var(--sx-text-3);margin-top:2px}.sx-side-card{border:1px solid var(--sx-border);border-radius:var(--sx-radius-lg);overflow:hidden;margin-bottom:14px}.sx-side-tabs{display:flex;gap:15px;padding:11px 14px 0;font-size:13px;font-weight:700;border-bottom:1px solid var(--sx-border)}.sx-side-tab{padding-bottom:9px;color:var(--sx-text-3);cursor:pointer;position:relative;transition:color .15s}.sx-side-tab.active{color:var(--sx-blue)}.sx-side-tab.active:after{content:"";position:absolute;bottom:-1px;left:0;right:0;height:2px;background:var(--sx-blue)}.sx-side-body{padding:6px 14px 12px}.sx-rule-item{display:flex;gap:10px;padding:9px 0;border-bottom:1px dashed var(--sx-border);font-size:12.5px;line-height:1.5;transition:color .15s}.sx-rule-item:last-child{border-bottom:none}.sx-rule-item:hover{color:var(--sx-blue)}.sx-rule-date{color:var(--sx-text-3);flex-shrink:0;font-size:11.5px;padding-top:1px}.sx-empty{text-align:center;padding:34px 16px;color:var(--sx-text-4);font-size:13px;border:1px dashed var(--sx-border-2);border-radius:var(--sx-radius)}.sx-page-head{padding:20px 0 16px}.sx-page-title{font-size:22px;font-weight:700}.sx-page-desc{font-size:13px;color:var(--sx-text-3);margin-top:6px}.sx-filter-bar{display:flex;align-items:center;gap:10px;flex-wrap:wrap;padding:12px 0 16px}.sx-filter-chip{font-size:12.5px;padding:5px 13px;border-radius:15px;border:1px solid var(--sx-border-2);color:var(--sx-text-2);transition:all .15s}.sx-filter-chip:hover{border-color:var(--sx-blue);color:var(--sx-blue)}.sx-filter-chip.active{background:var(--sx-blue);border-color:var(--sx-blue);color:#fff}.sx-footer{background:#1a1d24;color:rgba(255,255,255,.62);padding:30px 0 22px;margin-top:40px;font-size:12.5px}.sx-footer a:hover{color:#fff}.sx-footer-cols{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));grid-gap:26px;gap:26px;padding-bottom:22px;border-bottom:1px solid rgba(255,255,255,.1)}.sx-footer-col-title{color:#fff;font-weight:600;margin-bottom:11px;font-size:13px}.sx-footer-col a{display:block;padding:4px 0}.sx-footer-bottom{padding-top:18px;text-align:center;font-size:12px;opacity:.55}@media (max-width:1400px){.sx-main-grid{grid-template-columns:200px minmax(0,1fr) 220px}}@media (max-width:1180px){.sx-main-grid{grid-template-columns:190px minmax(0,1fr)}.sx-side-col{display:none}.sx-card-grid,.sx-path-tabs{grid-template-columns:repeat(3,minmax(0,1fr))}}@media (max-width:900px){.sx-nav{display:none}.sx-main-grid{grid-template-columns:minmax(0,1fr)}.sx-cat-col{display:none}.sx-card-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.sx-tools{grid-template-columns:repeat(3,minmax(0,1fr))}}.sx-richtext{font-size:14.5px;line-height:2;color:var(--sx-text)}.sx-richtext h2{font-size:18px;font-weight:700;margin:28px 0 12px;padding-left:11px;border-left:3.5px solid var(--sx-blue);line-height:1.4}.sx-richtext h3{font-size:15.5px;font-weight:700;margin:22px 0 10px}.sx-richtext p{margin:12px 0}.sx-richtext ol,.sx-richtext ul{margin:12px 0;padding-left:4px}.sx-richtext ul li{position:relative;padding-left:20px;margin:7px 0}.sx-richtext ul li:before{content:"";position:absolute;left:5px;top:12px;width:5px;height:5px;border-radius:50%;background:var(--sx-blue)}.sx-richtext ol{counter-reset:sx-ol}.sx-richtext ol li{counter-increment:sx-ol;position:relative;padding-left:26px;margin:7px 0}.sx-richtext ol li:before{content:counter(sx-ol);position:absolute;left:0;top:5px;width:18px;height:18px;border-radius:4px;background:var(--sx-blue-50);color:var(--sx-blue);font-size:11px;font-weight:700;display:grid;place-items:center}.sx-richtext blockquote{margin:18px 0;padding:14px 18px;background:var(--sx-blue-50);border-left:3px solid var(--sx-blue);border-radius:0 8px 8px 0;color:var(--sx-text-2)}.sx-richtext blockquote p{margin:0}.sx-richtext img{border-radius:8px;margin:16px 0;width:100%;border:1px solid var(--sx-border)}.sx-richtext table{width:100%;border-collapse:collapse;margin:18px 0;font-size:13px}.sx-richtext td,.sx-richtext th{border:1px solid var(--sx-border-2);padding:9px 12px;text-align:left}.sx-richtext th{background:var(--sx-bg-2);font-weight:600}.sx-richtext strong{color:var(--sx-text);font-weight:600}.sx-richtext a{color:var(--sx-blue);text-decoration:underline}.sx-richtext code{background:var(--sx-bg-2);padding:2px 6px;border-radius:4px;font-size:13px;font-family:SF Mono,Menlo,Consolas,monospace}.sx-richtext hr{margin:24px 0;border:none;border-top:1px solid var(--sx-border)}