:root{--ink:#202130;--muted:#707381;--purple:#7051e9;--purple-dark:#5637c8;--line:#e4e5ed;--bg:#f8f9fc;--green:#27856b}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;color:var(--ink);background:var(--bg);font-family:Inter,"Microsoft YaHei","PingFang SC",sans-serif;font-size:15px;line-height:1.8;-webkit-font-smoothing:antialiased}button,input,select{font:inherit}button,a{-webkit-tap-highlight-color:transparent}a{color:inherit;text-decoration:none}a:hover{color:var(--purple)}button{cursor:pointer;color:inherit}a:focus-visible,button:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #ad97ff;outline-offset:4px}[hidden]{display:none!important}h1,h2,h3,h4,p{margin:0}section{scroll-margin-top:90px}.wrap{max-width:1180px;margin:auto;padding:0 32px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip-link{position:fixed;left:10px;top:-80px;z-index:100;background:white;padding:10px}.skip-link:focus{top:10px}
.nav-shell{background:#ffffffed;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20;backdrop-filter:blur(16px)}.nav{height:80px;display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{display:flex;align-items:center;gap:11px;font-size:19px;font-weight:800;letter-spacing:-.7px;white-space:nowrap}.brand-icon{height:33px;width:33px;border-radius:10px;background:var(--ink);color:white;display:grid;place-items:center;font-size:24px;line-height:1;font-family:Arial,sans-serif;flex-shrink:0}.brand-icon span{transform:rotate(-18deg)}.brand-course{font-weight:600;font-size:16px;letter-spacing:-.5px}.brand-sub{font-size:10px;color:#858696;font-weight:500;letter-spacing:1.35px;display:block;line-height:1.2;margin-top:4px}.nav-links{display:flex;gap:22px;font-size:13px;color:#626572}.nav-links a.active{color:var(--purple)}.nav-actions{display:flex;align-items:center;gap:12px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:12px;border-radius:9px;padding:12px 21px;border:1px solid var(--line);background:white;font-weight:600;line-height:1.5;transition:transform .2s,box-shadow .2s;font-size:14px}.btn:hover{transform:translateY(-2px);box-shadow:0 5px 15px #1d20300b}.btn-primary{background:var(--purple);border-color:var(--purple);color:white}.btn-primary:hover{background:var(--purple-dark);color:white}.btn-dark{background:var(--ink);border-color:var(--ink);color:#fff}.btn-dark:hover{color:white}.btn-sm{padding:9px 16px;font-size:12px}.arrow{font-size:18px;line-height:1}.mobile-menu-toggle{display:none;border:1px solid var(--line);background:white;border-radius:7px;width:35px;height:35px;font-size:18px}.back-top{position:fixed;bottom:24px;right:23px;width:36px;height:36px;display:grid;place-items:center;background:white;border:1px solid var(--line);border-radius:9px;z-index:10}
.hero{padding:72px 0 37px;position:relative;overflow:hidden}.hero-grid{display:grid;grid-template-columns:1.02fr 1fr;gap:25px;align-items:center}.eyebrow{display:flex;align-items:center;gap:8px;font-size:12px;color:#6e5b99;font-weight:600}.eyebrow .dot{width:7px;height:7px;border-radius:50%;background:#8e73eb;box-shadow:0 0 0 4px #ece7fc;flex-shrink:0}.instructor-divider{color:#b5a6cb;margin:0 4px}.hero h1{font-size:56px;line-height:1.24;letter-spacing:-2.5px;font-weight:800;margin:21px 0 20px}.violet{color:var(--purple)}.hero-copy{font-size:15px;line-height:1.95;color:var(--muted)}.hero-buttons{display:flex;gap:12px;margin-top:25px}.hero-points{display:flex;gap:16px;margin-top:23px;color:#777a88;font-size:12px}.hero-points span::before{content:'✓';color:var(--green);margin-right:5px}.hero-visual{height:405px;position:relative;display:flex;align-items:center;justify-content:center}.orbit{width:370px;height:370px;position:absolute;border-radius:50%;border:1px solid #e3def4;background:radial-gradient(circle,#eee8ff70,transparent 70%)}.orbit::before,.orbit::after{content:'';position:absolute;border-radius:50%}.orbit::before{inset:38px;border:1px dashed #d8cfef}.orbit::after{inset:80px;border:1px solid #e5dff5}.orb-dot{position:absolute;width:9px;height:9px;background:#b5a1ef;border-radius:50%;top:26px;left:103px}.spark-node{position:absolute;top:34px;right:47px;color:#a896da;font-size:25px}.answer-card{position:relative;width:346px;background:white;box-shadow:0 17px 60px #45347416;border:1px solid #e7e2f2;border-radius:17px;transform:rotate(-3deg);padding:20px 22px;z-index:2}.answer-head{display:flex;align-items:center;gap:9px;font-size:11px;color:#85818e}.mini{background:#f1ebff;border-radius:7px;width:25px;height:25px;display:grid;place-items:center;color:var(--purple);font-size:18px}.visual-example{margin-left:auto;font-size:9px;color:#a297b0}.answer-card h3{font-size:21px;line-height:1.6;margin:13px 0 16px}.practice-checks{display:grid;gap:9px;font-size:12px;color:#80748f}.practice-checks span{display:flex;align-items:center;gap:8px}.practice-checks i{font-style:normal;color:#9c81cf;background:#f0ebf8;width:15px;height:15px;border-radius:50%;display:grid;place-items:center;font-size:9px}.cited{display:flex;align-items:center;justify-content:space-between;border-top:1px solid #eeeaf5;margin-top:17px;padding-top:13px;color:#88818f;font-size:10px}.cited span:first-child{background:#f0ecfb;color:#8066bf;border-radius:4px;padding:3px 7px}.float-chip{position:absolute;display:flex;align-items:center;gap:8px;padding:10px 15px;border:1px solid #e7e5ee;background:white;border-radius:11px;box-shadow:0 8px 24px #36304909;font-size:12px;z-index:3}.chip-doubao{left:8px;top:54px;transform:rotate(-6deg)}.chip-kimi{right:-4px;top:115px;transform:rotate(5deg)}.chip-qwen{left:29px;bottom:41px;transform:rotate(4deg)}.app-symbol{display:inline-grid;place-items:center;width:28px;height:28px;border-radius:7px;font-weight:800;font-size:17px;flex-shrink:0}.doubao{background:#eaf4ff;color:#4386d3}.kimi{background:#22252e;color:white}.qwen{background:#f0eaff;color:#8b5bd7}.visual-caption{position:absolute;right:19px;bottom:22px;font-size:10px;letter-spacing:2px;color:#a297b0;writing-mode:vertical-rl}.hero-bottom{display:grid;grid-template-columns:repeat(3,1fr);border:1px solid var(--line);border-radius:13px;margin-top:35px;background:white}.hero-bottom>div{padding:17px 25px;display:flex;align-items:center;gap:14px}.hero-bottom>div+div{border-left:1px solid var(--line)}.path-num{font-size:23px;color:#b5a3d4;font-family:Georgia,serif;font-style:italic}.hero-bottom b{font-size:13px;display:block}.hero-bottom small{font-size:12px;color:#858392}
.section{padding:60px 0}.section-head{display:flex;justify-content:space-between;align-items:flex-end;gap:20px;margin-bottom:27px}.section-kicker{color:var(--purple);font-size:10px;letter-spacing:2px;font-weight:700;margin-bottom:7px}.section-head h2{font-size:28px;line-height:1.45;letter-spacing:-.7px}.section-head p{font-size:14px;color:var(--muted);margin-top:8px}.text-link{font-size:12px;color:#777887;display:flex;gap:9px;align-items:center;white-space:nowrap}.pill{display:inline-flex;align-items:center;gap:5px;background:#eef8f3;color:#348266;font-size:11px;font-weight:500;padding:3px 8px;border-radius:5px}.section-head h2 .pill{vertical-align:middle;margin-left:10px}.course-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:21px}.course-card{background:white;border:1px solid var(--line);border-radius:15px;overflow:hidden;transition:transform .2s}.course-card:hover{transform:translateY(-3px)}.course-art{height:162px;position:relative;overflow:hidden;padding:20px 23px;display:flex;flex-direction:column;justify-content:space-between}.art-purple{background:#eee9fc;color:#7358ae}.art-blue{background:#e8effc;color:#5a78ae}.art-mint{background:#e5f1ec;color:#4b8a74}.art-label{font-size:10px;letter-spacing:1.5px;z-index:1}.art-title{font-size:30px;font-weight:800;line-height:1.1;letter-spacing:-.8px;z-index:1}.art-title small{font-size:12px;font-weight:400;letter-spacing:0;display:block;margin-top:9px}.art-watermark{position:absolute;font-weight:900;font-size:105px;right:13px;bottom:-28px;opacity:.1;letter-spacing:-10px}.art-shape{position:absolute;width:115px;height:115px;border:1px solid currentColor;opacity:.18;right:-10px;top:-12px;transform:rotate(25deg);border-radius:23px}.course-body{padding:20px}.course-meta{color:#858796;font-size:12px;display:flex;align-items:center;gap:9px;margin-bottom:10px}.course-body h3{font-size:16px;margin-bottom:9px}.course-body p{font-size:14px;color:#787c8a;line-height:1.9}.course-foot{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:19px;padding-top:14px;border-top:1px solid #f0f0f5}.course-foot>span{font-size:12px;color:var(--green)}.read-button{border:0;background:none;padding:0;color:var(--purple);font-weight:600;font-size:13px}.course-note{text-align:center;margin-top:23px;color:#797c8c;font-size:13px}.course-note>span{color:var(--purple)}
.platform-section{background:white;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.platform-head-row{display:flex;justify-content:space-between;align-items:center;gap:25px;margin-bottom:21px}.platform-tabs{display:flex;gap:7px;background:#f4f5f9;padding:5px;border:1px solid #efeff4;border-radius:10px}.platform-tab{border:0;background:none;border-radius:7px;padding:9px 23px;color:#737687;font-size:13px}.platform-tab[aria-selected=true]{background:white;color:var(--ink);font-weight:600;box-shadow:0 2px 7px #25253809}.platform-helper{font-size:12px;color:#858795}.platform-panel{display:grid;grid-template-columns:.85fr 1.15fr;gap:38px;background:#fafaff;border:1px solid #e7e4f1;border-radius:16px;padding:32px 35px;margin-top:18px}.platform-brand{display:flex;align-items:center;gap:12px;margin-bottom:17px}.platform-brand .app-symbol{height:42px;width:42px;font-size:25px;border-radius:12px}.platform-brand h3{font-size:22px;line-height:1.2}.platform-brand small{display:block;font-size:11px;color:#858499;margin-top:6px;letter-spacing:.7px}.platform-intro{color:#717487;font-size:14px;line-height:1.95}.tags{display:flex;gap:7px;flex-wrap:wrap;margin-top:17px}.tag{font-size:11px;border:1px solid #e4e0f1;color:#8b7eaa;padding:3px 9px;border-radius:5px;background:white}.platform-cta{margin-top:24px;display:flex;gap:12px;align-items:center;flex-wrap:wrap}.syllabus{display:flex;flex-direction:column;justify-content:center}.syllabus-item{display:flex;align-items:center;gap:14px;padding:14px 0}.syllabus-item+.syllabus-item{border-top:1px solid #eae7f2}.syllabus-num{font-size:12px;color:#9c93b1;font-family:monospace}.syllabus-item h4{font-size:14px;margin-bottom:3px}.syllabus-item p{font-size:12px;color:#817c91}.syllabus-access{margin-left:auto;flex-shrink:0;font-size:10px;background:#ece7fb;color:#7b60b9;padding:3px 7px;border-radius:4px}.syllabus-access.free{color:#3b917b;background:#e7f4ee}.platform-summary{margin-top:16px;color:#817d90;font-size:12px;display:flex;justify-content:space-between;gap:20px}.instructor-section{padding-bottom:28px}.instructor-layout{display:grid;grid-template-columns:290px 1fr;gap:26px}.instructor-card{border:1px solid #e1d9f0;border-radius:15px;background:linear-gradient(135deg,#e9e1f8,#f5f1fc);padding:25px;display:flex;align-items:flex-start;gap:17px;flex-wrap:wrap}.instructor-monogram{width:66px;height:79px;flex-shrink:0;color:#8d72b6;font-size:29px;letter-spacing:-5px;line-height:1.12;font-weight:700;padding:8px 10px;border:1px solid #cdbde3;background:#f7f3fd66;transform:rotate(-5deg);border-radius:9px}.instructor-monogram span{display:block;text-align:right}.instructor-identity{padding-top:3px}.instructor-label{font-size:12px;color:#8b729f}.instructor-identity h3{font-size:27px;line-height:1.5;letter-spacing:2px}.instructor-identity p{font-size:13px;color:#907da6}.instructor-card-bottom{width:100%;align-self:flex-end;margin-top:19px}.instructor-card-bottom p{font-size:13px;color:#7d668f;margin-bottom:12px}.instructor-card-bottom a{display:flex;align-items:center;justify-content:space-between;font-size:12px;color:#84669f;border-top:1px solid #dacee9;padding-top:12px}.practice-path{display:grid;grid-template-columns:1fr 1fr;gap:20px 29px;background:white;border:1px solid var(--line);border-radius:15px;padding:25px 28px}.practice-step{display:flex;gap:12px}.step-index{color:#9c85c0;font-size:12px;font-family:monospace;padding-top:3px}.practice-step h3{font-size:16px;margin-bottom:6px}.practice-step p{font-size:13px;line-height:1.9;color:#777381}.step-output{display:inline-block;margin-top:9px;font-size:11px;padding:3px 7px;background:#f3f0f9;color:#806498;border-radius:4px}.instructor-footnote{font-size:12px;color:#807687;margin-top:15px}.instructor-footnote a{text-decoration:underline}.example-banner{display:flex;align-items:center;justify-content:space-between;gap:25px;background:#efebf8;border:1px solid #e0d9ef;border-radius:15px;padding:25px 30px;margin:10px 0}.example-banner h2{font-size:20px;margin:10px 0 6px}.example-banner p{font-size:13px;color:#82738e}.example-banner .btn{white-space:nowrap}
.timeline-layout{display:grid;grid-template-columns:290px 1fr;gap:60px}.timeline-intro h2{font-size:30px;line-height:1.5;letter-spacing:-1px}.timeline-intro>p{font-size:14px;line-height:1.95;color:#777381;margin:13px 0 22px}.timeline-legend{background:white;border:1px solid var(--line);border-radius:12px;padding:15px 17px}.timeline-legend p{font-size:12px;color:#797381;display:flex;align-items:center;gap:9px;padding:5px 0}.legend-dot{width:6px;height:6px;border-radius:50%;background:#8d72df;flex-shrink:0}.legend-dot.green{background:#57a78e}.legend-dot.blue{background:#7393d2}.timeline-intro>.demo-note{font-size:12px;color:#8c7e94}.filters{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:23px}.filter-buttons{display:flex;gap:5px;flex-wrap:wrap}.filter-button{font-size:12px;padding:6px 10px;background:transparent;border:1px solid transparent;border-radius:6px;color:#797181}.filter-button[aria-pressed=true]{background:#eee9fb;color:#7454bf;border-color:#e5dcf9}.select-label select{font-size:12px;border:1px solid var(--line);background:white;color:#797181;padding:7px 9px;border-radius:6px;max-width:110px}.timeline-items{border-left:1px solid #e0dcec;margin-left:7px;padding-left:28px}.timeline-item{position:relative;padding:0 0 28px}.timeline-item::before{content:'';position:absolute;width:8px;height:8px;background:#a68bdd;border:3px solid var(--bg);box-shadow:0 0 0 1px #cfc2e6;border-radius:50%;left:-35px;top:5px}.timeline-top{display:flex;gap:9px;align-items:center;font-size:12px;color:#7a7284;flex-wrap:wrap}.timeline-top time{font-family:monospace;font-size:13px;color:#746b81}.timeline-type{color:#7d5caf;background:#f0eafa;padding:2px 7px;border-radius:4px;font-size:11px}.timeline-item h3{font-size:17px;margin:9px 0 7px;line-height:1.7}.timeline-item>p{font-size:14px;color:#7c7384;line-height:1.9}.timeline-action{display:inline-block;padding-top:9px;font-size:13px;color:#8060ac}.timeline-bottom{padding-left:35px;font-size:12px;color:#877990;display:flex;align-items:center;gap:10px}.timeline-bottom>span:first-child{height:5px;width:5px;background:#c9c0da;border-radius:50%;flex-shrink:0}.timeline-empty{padding:22px 0;color:#80718d;font-size:14px}.pricing{background:white;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.plan-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.plan{padding:25px;border:1px solid var(--line);border-radius:14px;position:relative;display:flex;flex-direction:column}.plan.featured{border-color:#a18bea;background:#fdfcff}.plan h3{font-size:19px;margin-bottom:6px}.plan-description{font-size:14px;color:#7c7384}.plan-price{font-size:29px;font-weight:750;margin:23px 0 3px;letter-spacing:-.5px}.plan-price small{font-size:12px;font-weight:400;color:#918496;letter-spacing:0}.plan-price .price-pending{font-size:22px}.plan-sub{color:#8a7b91;font-size:13px;min-height:20px}.plan ul{list-style:none;padding:17px 0 22px;margin:17px 0 0;border-top:1px solid #efedf4;font-size:14px;color:#776b81}.plan li{padding:5px 0}.plan li::before{content:'✓';color:#9e8bc8;margin-right:9px}.plan .btn{width:100%;font-size:13px;margin-top:auto}.plan-ribbon{position:absolute;right:18px;top:-10px;background:#7c60d6;color:white;font-size:11px;padding:2px 9px;border-radius:5px}.faq-layout{display:grid;grid-template-columns:290px 1fr;gap:60px}.faq-heading h2{font-size:28px}.faq-heading p{font-size:14px;color:#807485;margin-top:10px}.faq-item{border-bottom:1px solid var(--line)}.faq-item:first-child{border-top:1px solid var(--line)}.faq-item summary{padding:18px 0;font-size:15px;cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:15px}.faq-item summary::-webkit-details-marker{display:none}.faq-item summary::after{content:'+';color:#9b88a9;font-size:20px}.faq-item[open] summary::after{content:'−'}.faq-item p{font-size:14px;color:#7d7085;line-height:1.95;padding:0 25px 19px 0}.contact-section{padding:0 0 63px}.contact-banner{background:#242334;border-radius:19px;padding:40px 43px;display:flex;justify-content:space-between;align-items:center;gap:25px;position:relative;overflow:hidden}.contact-banner h2{font-size:25px;color:white;margin-bottom:9px}.contact-banner p{font-size:14px;color:#b3adc2}.contact-banner .btn{background:#e6ddff;color:#4b376f;border-color:#e6ddff;white-space:nowrap}.contact-domain{display:inline-block;color:#c8bbdf;font-size:13px;margin-top:8px}.footer{border-top:1px solid var(--line);padding:28px 0 23px}.footer-row{display:flex;justify-content:space-between;align-items:center;gap:20px}.footer .brand{font-size:16px}.footer .brand-icon{width:26px;height:26px;font-size:20px;border-radius:7px}.footer-links{display:flex;gap:17px;font-size:12px;color:#81718e;flex-wrap:wrap}.footer-note{display:flex;justify-content:space-between;margin-top:22px;padding-top:18px;border-top:1px solid #ececf2;font-size:11px;color:#8b7c96;gap:20px}
.breadcrumbs{display:flex;gap:10px;flex-wrap:wrap;font-size:12px;padding:26px 0;color:#887997;line-height:1.8}.breadcrumbs>span:last-child{color:#5e506e}.article-layout{display:grid;grid-template-columns:minmax(0,790px) 245px;gap:55px;padding-bottom:70px}.article-main{min-width:0}.article-header{padding:13px 0 28px;border-bottom:1px solid var(--line);margin-bottom:30px}.article-header h1{font-size:34px;line-height:1.5;letter-spacing:-1px;margin:15px 0}.article-lead{font-size:16px;color:#796e84;line-height:1.9}.article-meta{display:flex;flex-wrap:wrap;gap:10px 23px;font-size:13px;color:#8d7c9b;margin-top:19px}.article-aside{align-self:start;position:sticky;top:110px;background:white;border:1px solid var(--line);border-radius:15px;padding:22px;display:flex;flex-direction:column;gap:15px;margin-top:16px;font-size:13px;color:#7b6b89}.article-aside h2{font-size:17px;color:var(--ink)}.article-aside .btn{font-size:12px;padding:10px}.aside-note{border-top:1px solid var(--line);padding-top:15px;font-size:12px;color:#8f7c9d}.prose{font-size:16px;line-height:2;color:#5f536c;overflow-wrap:anywhere}.prose h2{font-size:23px;color:var(--ink);margin:32px 0 13px;line-height:1.6}.prose h3{font-size:19px;margin:25px 0 10px;color:var(--ink)}.prose p+p{margin-top:14px}.prose ul,.prose ol{padding-left:24px;margin:15px 0}.prose li{margin:8px 0}.prose a{color:var(--purple);text-decoration:underline;text-underline-offset:3px}.prose table{width:100%;border-collapse:collapse;font-size:14px;margin:20px 0;table-layout:fixed}.prose th,.prose td{border:1px solid #e4ddec;padding:13px;vertical-align:top;word-break:break-word}.prose th{background:#efeaf8;text-align:left;font-weight:600}.prose blockquote{border-left:3px solid #a58acf;background:#f1edf8;padding:20px;margin:20px 0;font-size:15px}.learning-goal,.notice{background:#f0ebf9;border:1px solid #e3d9f0;border-radius:12px;padding:19px 23px;margin:20px 0}.learning-goal h2{font-size:18px;margin:0 0 8px}.lesson-exercise{background:#edf4ee;border:1px solid #dce9df;padding:19px 22px;border-radius:12px;margin:25px 0}.lesson-exercise b{display:block;font-size:15px;color:#548468;margin-bottom:5px}.references{border-top:1px solid var(--line);margin-top:30px}.references p{font-size:13px;color:#8b799b}.article-bottom{display:flex;gap:12px;flex-wrap:wrap;margin-top:38px;padding-top:25px;border-top:1px solid var(--line)}.page-heading{padding-top:30px;padding-bottom:35px}.page-heading h1{font-size:36px;line-height:1.5;letter-spacing:-1px}.page-heading>p{font-size:16px;color:#7c7088;margin-top:13px}.collection{padding-bottom:70px;max-width:1000px}.resource-list{display:grid;gap:20px}.resource-list article{display:flex;gap:25px;background:white;border:1px solid var(--line);border-radius:14px;padding:27px 30px}.resource-number{color:#a28aba;font-size:25px;font-family:Georgia,serif}.resource-list h2{font-size:22px;margin-bottom:12px}.resource-list p{font-size:15px;color:#83738f;margin-bottom:15px}.collection-note{font-size:14px;color:#867393;margin-top:25px}.collection-note a{color:var(--purple)}.timeline-page{padding-top:0}.legal-page{padding-top:40px;padding-bottom:70px;max-width:900px}.legal-page h1{font-size:32px;margin-bottom:20px}.fact-list{display:grid;grid-template-columns:110px 1fr;font-size:15px;border-top:1px solid var(--line);margin:20px 0}.fact-list dt,.fact-list dd{padding:13px 0;border-bottom:1px solid var(--line);margin:0}.fact-list dt{font-weight:600;color:#5b4d68}.fact-list dd{color:#81718e}.wechat-box{padding:22px;background:#eee8fa;border:1px solid #ded1f1;border-radius:12px;margin:22px 0}.wechat-box strong{display:block;font-size:27px;color:#604398;letter-spacing:1px}.wechat-box .btn{margin-top:12px;text-decoration:none}.copy-status{display:block;font-size:13px;margin-top:10px;color:#7d60a2}
@media(min-width:1400px){.hero h1{font-size:58px}}
@media(max-width:1050px){.wrap{padding-left:25px;padding-right:25px}.nav-links{gap:14px;font-size:12px}.brand{font-size:17px}.brand-course{font-size:14px}.nav-actions .btn{font-size:11px;padding:10px}.hero h1{font-size:45px}.hero-copy{font-size:14px}.eyebrow{font-size:10px}.hero-points{font-size:10px;gap:10px}.hero-visual{transform:scale(.88);transform-origin:center right}.timeline-layout,.faq-layout{grid-template-columns:240px 1fr;gap:32px}.instructor-layout{grid-template-columns:245px 1fr;gap:20px}.practice-path{gap:20px;padding:24px}.article-layout{grid-template-columns:minmax(0,1fr) 210px;gap:30px}.article-header h1{font-size:30px}.course-grid{gap:15px}.course-body{padding:17px}.platform-panel{padding:27px;gap:25px}.platform-tab{padding:9px 17px}.platform-helper{font-size:10px}.hero-bottom>div{padding:17px 15px}.hero-bottom b{font-size:12px}.hero-bottom small{font-size:10px}.course-foot{flex-wrap:wrap}}
@media(max-width:760px){html{scroll-padding-top:85px}.wrap{padding-left:20px;padding-right:20px}.nav{height:68px;gap:10px}.brand{font-size:15px;gap:8px}.brand-course{font-size:13px}.brand-sub{font-size:8px;letter-spacing:.9px}.brand-icon{width:29px;height:29px;font-size:22px}.nav-actions{gap:8px}.nav-actions .btn{font-size:10px;padding:9px}.mobile-menu-toggle{display:block}.nav-links{display:none;position:absolute;top:67px;left:0;right:0;background:white;padding:20px;border-bottom:1px solid var(--line);flex-wrap:wrap;justify-content:center;gap:18px;font-size:13px}.nav-links.is-open{display:flex}.hero{padding:36px 0 25px}.hero-grid{grid-template-columns:1fr;gap:0}.hero h1{font-size:38px;letter-spacing:-1.9px;line-height:1.3;margin:21px 0 18px}.eyebrow{font-size:10px;gap:6px;flex-wrap:wrap}.instructor-divider{margin:0 1px}.hero-copy{font-size:14px}.desktop-break{display:none}.hero-buttons{gap:10px;margin-top:24px}.hero-buttons .btn{font-size:13px;padding:12px 16px}.hero-points{font-size:10px;gap:9px;flex-wrap:wrap}.hero-visual{height:340px;width:100%;max-width:440px;margin:10px auto 0;transform:scale(.9);transform-origin:center}.orbit{width:310px;height:310px}.answer-card{width:300px}.answer-card h3{font-size:20px}.practice-checks{font-size:11px}.chip-doubao{left:0;top:28px}.chip-kimi{right:-2px;top:97px}.chip-qwen{left:12px;bottom:19px}.visual-caption{right:5px;bottom:5px}.hero-bottom{margin-top:0}.hero-bottom>div{padding:13px 9px;gap:7px;align-items:flex-start}.path-num{font-size:17px}.hero-bottom b{font-size:10px}.hero-bottom small{font-size:9px;display:block;line-height:1.8}.section{padding:42px 0}.section-head{display:block;margin-bottom:23px}.section-head h2{font-size:24px}.section-head p{font-size:14px}.section-head>.text-link{margin-top:12px}.section-kicker{font-size:9px}.section-head h2 .pill{font-size:10px;margin-left:4px}.course-grid{grid-template-columns:1fr;gap:18px}.course-art{height:145px;padding:20px}.art-title{font-size:30px}.course-body{padding:20px}.course-body h3{font-size:17px}.course-body p{font-size:14px}.course-meta{font-size:12px}.course-foot{flex-wrap:nowrap}.course-foot>span{font-size:12px}.read-button{font-size:13px}.course-note{font-size:12px;line-height:1.9}.platform-head-row{display:block}.platform-tabs{width:100%;gap:3px}.platform-tab{flex:1;padding:9px 6px;font-size:11px}.platform-helper{display:block;margin-top:10px;font-size:12px}.platform-panel{grid-template-columns:1fr;padding:23px;gap:19px}.platform-brand h3{font-size:22px}.platform-intro{font-size:14px}.platform-cta{gap:10px}.syllabus-item{gap:10px}.syllabus-item h4{font-size:14px}.syllabus-item p{font-size:12px}.syllabus-access{font-size:10px}.platform-summary{font-size:12px;flex-direction:column;gap:6px}.instructor-section{padding-bottom:20px}.instructor-layout{grid-template-columns:1fr;gap:16px}.instructor-card{padding:23px;gap:18px}.instructor-card-bottom{margin-top:2px}.instructor-card-bottom p{font-size:14px}.practice-path{padding:23px 20px;gap:24px 18px}.practice-step{gap:9px}.practice-step h3{font-size:15px}.practice-step p{font-size:13px}.step-output{font-size:11px;padding:3px 5px}.instructor-footnote{font-size:12px}.example-banner{flex-direction:column;align-items:flex-start;padding:23px}.example-banner h2{font-size:20px}.example-banner p{font-size:14px}.example-banner .btn{font-size:13px}.timeline-layout,.faq-layout{grid-template-columns:1fr;gap:26px}.timeline-intro h2{font-size:26px}.timeline-intro h2 br{display:none}.timeline-legend p{font-size:12px}.timeline-intro>.demo-note{font-size:12px}.filters{align-items:flex-start;gap:6px}.filter-button{padding:6px;font-size:11px}.filter-buttons{gap:2px}.select-label select{font-size:11px;padding:7px 6px;max-width:88px}.timeline-items{padding-left:23px}.timeline-item::before{left:-30px}.timeline-item h3{font-size:16px}.timeline-item>p{font-size:14px}.timeline-top{font-size:11px}.timeline-bottom{padding-left:29px;font-size:11px}.plan-grid{grid-template-columns:1fr;gap:25px}.plan{padding:25px}.plan h3{font-size:21px}.plan-price{margin-top:18px;font-size:30px}.plan ul{margin-top:15px;padding:15px 0 20px}.plan .btn{font-size:14px}.faq-heading h2{font-size:24px}.faq-heading p{font-size:14px}.faq-item summary{font-size:15px;padding:17px 0}.faq-item p{font-size:14px}.contact-section{padding-bottom:40px}.contact-banner{padding:28px 25px;flex-direction:column;align-items:flex-start;gap:23px}.contact-banner h2{font-size:23px}.contact-banner p{font-size:14px}.contact-banner .btn{font-size:13px}.footer{padding:25px 0}.footer-row{flex-direction:column;align-items:flex-start;gap:19px}.footer-links{gap:13px;font-size:12px}.footer-note{font-size:11px;flex-direction:column;gap:8px}.back-top{bottom:15px;right:15px}.breadcrumbs{font-size:12px;padding:20px 0}.article-layout{grid-template-columns:1fr;gap:30px;padding-bottom:45px}.article-header{padding:6px 0 24px}.article-header h1{font-size:28px;letter-spacing:-.8px}.article-lead{font-size:15px}.article-meta{font-size:12px;gap:8px 15px}.article-aside{position:static;margin-top:0;padding:23px;font-size:14px}.prose{font-size:16px;line-height:2}.prose h2{font-size:22px}.prose table{font-size:13px}.prose th,.prose td{padding:10px 8px}.learning-goal,.notice{padding:18px}.learning-goal h2{font-size:18px}.prose blockquote{margin:20px 0;padding:17px}.article-bottom .btn{font-size:12px;padding:12px}.page-heading{padding-top:22px;padding-bottom:28px}.page-heading 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