:root{--bg:#f7f8fa;--paper:#fff;--ink:#202a35;--muted:#687482;--line:#e7eaee;--accent:#bc572c;--soft:#fff2e9;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg);font-synthesis:none}*{box-sizing:border-box}body{margin:0}button,input{font:inherit}button,a,input{-webkit-tap-highlight-color:transparent}a{color:inherit;text-decoration:none}button{cursor:pointer}button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid #dfa16e;outline-offset:3px}button{border:0}button:disabled{opacity:.55;cursor:wait}.topbar{height:72px;padding:0 36px;display:flex;align-items:center;justify-content:space-between;background:white;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}.brand{display:flex;align-items:center;gap:11px;font-size:18px;font-weight:700}.brand b{font-size:14px;color:var(--muted);font-weight:500;margin-left:14px}.brand-icon{display:grid;place-items:center;color:white;background:#c16536;width:33px;height:33px;border-radius:9px;font-size:17px}.topbar nav{display:flex;gap:26px;font-size:13px;color:var(--muted)}.topbar nav a:hover{color:var(--accent)}.workspace{max-width:1680px;margin:auto;display:grid;grid-template-columns:290px minmax(0,1fr)}.sidebar{border-right:1px solid var(--line);padding:32px 20px 24px;background:#fafbfc;height:calc(100vh - 72px);overflow:auto;position:sticky;top:72px;scrollbar-width:thin}.side-heading{display:flex;justify-content:space-between;align-items:center}.eyebrow{font-size:10px;font-weight:650;letter-spacing:1.4px;color:#77828b}.side-heading h1{font-size:22px;letter-spacing:-.5px;margin:10px 0 0}.side-intro{font-size:12px;color:var(--muted);margin:12px 0 23px}.search-label{display:flex;align-items:center;gap:8px;border:1px solid #dfe4e9;background:white;border-radius:7px;padding:10px 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10px;margin:3px 0;font-size:12px;line-height:1.6}.lesson-link .number{font-size:10px;font-variant-numeric:tabular-nums;color:#929da7;padding-top:2px}.lesson-link .label{flex:1}.lesson-link.active{background:var(--soft);color:#994e28;font-weight:600}.lesson-link.active .number{color:#bc703e}.lesson-link:hover{background:#eef0f2}.lesson-link.active:hover{background:var(--soft)}.done{color:#538266}.back-home{display:block;padding:30px 10px 5px;font-size:12px;color:var(--muted)}.main{padding:30px 48px 48px;min-width:0}.breadcrumb{display:flex;justify-content:space-between;color:#7b8690;font-size:11px;align-items:center;gap:14px}.breadcrumb i{font-style:normal;margin:0 10px;color:#b3bbc3}.course-number{font-variant-numeric:tabular-nums;white-space:nowrap}.lesson-heading{padding:36px 0 28px;max-width:900px}.lesson-heading .eyebrow{color:var(--accent);font-size:11px}.lesson-heading h2{font-size:30px;line-height:1.5;letter-spacing:-.8px;margin:11px 0 13px;font-weight:650}.lesson-heading>p{font-size:13px;line-height:1.9;color:var(--muted);max-width:780px;margin:0}.content-layout{display:grid;grid-template-columns:minmax(0,1fr) 158px;gap:30px;align-items:start}.reading-column{min-width:0}.materials{margin:0 0 22px}.section-label{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}.section-label h3{font-size:12px;font-weight:600;margin:0}.section-label span{font-size:10px;color:var(--muted)}#resources{display:flex;flex-direction:column;gap:7px}.resource{padding:13px 15px;border:1px solid var(--line);background:white;border-radius:8px;display:flex;gap:12px;align-items:center;text-align:left;width:100%;font-size:12px;color:var(--ink)}.resource:hover{border-color:#d1b194}.resource.selected{border-color:#d9ae89;background:#fffaf5}.resource-icon{width:30px;height:34px;border-radius:5px;background:#f2f4f6;display:grid;place-items:center;flex:none;font-size:9px;font-weight:700;color:#89949e}.selected .resource-icon{background:#f6e6d6;color:#ae6537}.resource-copy{flex:1;min-width:0}.resource b{display:block;font-weight:550;line-height:1.6}.resource small{display:block;color:var(--muted);font-size:10px;line-height:1.7;margin-top:3px}.resource-arrow{font-size:12px;color:#8c969f}.reader-section{border:1px solid var(--line);border-radius:10px;background:white;overflow:hidden;scroll-margin-top:88px}.reading-toolbar{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:15px 27px;border-bottom:1px solid var(--line);font-size:11px;color:#808b95}.reading-toolbar a{color:var(--accent);white-space:nowrap}.reader{padding:28px 32px 42px;font-size:14px;line-height:1.95;overflow-wrap:anywhere;color:#3b4650}.reader h1{font-size:24px;line-height:1.55;color:var(--ink);font-weight:650;margin:6px 0 24px}.reader h2{font-size:19px;line-height:1.7;color:var(--ink);margin:36px 0 16px;padding-top:4px;letter-spacing:-.2px}.reader h3{font-size:16px;line-height:1.7;margin:28px 0 10px;color:var(--ink)}.reader h4{font-size:14px;margin:24px 0 8px}.reader h1,.reader h2,.reader h3,.reader h4{scroll-margin-top:96px}.reader p{margin:12px 0}.reader ul,.reader ol{padding-left:23px}.reader li{padding-left:3px;margin:6px 0}.reader a{color:#aa562d;text-decoration:underline;text-underline-offset:3px}.reader img{max-width:100%;height:auto;display:block;border:1px solid var(--line);border-radius:6px;margin:20px auto}.reader table{border-collapse:collapse;display:block;overflow-x:auto;font-size:12px;margin:20px 0;max-width:100%}.reader th,.reader td{border:1px solid var(--line);padding:10px 13px;text-align:left;min-width:100px}.reader th{background:#f4f6f7;color:var(--ink)}.reader blockquote{border-left:3px solid #d9b48c;background:#fffcf6;padding:7px 18px;margin:20px 0;color:#62665e}.reader pre{overflow:auto;background:#f5f6f8;padding:18px;border-radius:6px;font-size:12px}.reader code{font-size:12px}.source-note{border-bottom:1px solid var(--line);padding-bottom:18px;margin-bottom:25px;color:var(--muted);font-size:11px;line-height:1.8}.source-note span{display:inline-block;color:#9c633b;background:#fff4e9;padding:2px 8px;border-radius:4px}.source-note p{margin:8px 0}.outline-inner{position:sticky;top:109px}.outline{padding-top:4px;position:sticky;top:108px}.outline nav{margin-top:16px;display:flex;flex-direction:column;gap:12px;max-height:55vh;overflow:auto;scrollbar-width:thin}.outline nav a{font-size:11px;line-height:1.7;color:#818b95;padding-left:11px;border-left:1px solid #e0e4e8}.outline nav a:hover{color:var(--accent);border-color:var(--accent)}.reading-tip{margin-top:30px;border-top:1px solid var(--line);padding-top:22px;font-size:11px;color:#55646b}.reading-tip p{color:#939ba3;font-size:11px;line-height:1.8}.lesson-actions{display:flex;justify-content:space-between;gap:15px;margin:23px 0 14px}.primary,.secondary{border-radius:7px;padding:12px 20px;font-size:12px;min-height:42px}.primary{background:#b45b32;color:white}.primary:hover{background:#9e4b25}.secondary{background:white;border:1px solid #dde2e6;color:#53616e}.progress-note{font-size:10px;color:#929ba3;text-align:center}.empty{padding:22px 0;color:var(--muted);font-size:12px;line-height:1.8}.mobile-only{display:none}.standalone{max-width:880px;padding:36px 20px;margin:auto}.standalone>.reader{background:white;border:1px solid var(--line);border-radius:10px;margin-top:20px}.back-link{font-size:12px;color:var(--muted)}.manual .wrap{padding:0}.manual .hero{padding:0}.manual .tag{font-size:11px;color:var(--accent)}.manual .toc{display:flex;flex-wrap:wrap;gap:8px 18px;padding:15px 0;border-block:1px solid var(--line);font-size:12px}.manual .card,.manual .step,.manual .rule,.manual .check{border:1px solid var(--line);padding:15px;margin:12px 0;border-radius:6px}.manual .quote,.manual .formula{background:#fff6eb;padding:15px;border-left:3px solid #d4ab7d;margin:20px 0}.manual .footer{font-size:11px;color:var(--muted);border-top:1px solid var(--line);margin-top:30px;padding-top:20px}.reader details{border-bottom:1px solid var(--line);padding:14px 0}.reader summary{cursor:pointer;font-weight:600}.error-box{background:#fff7ef;border:1px solid #eed5ba;padding:18px;border-radius:6px}.error-box button{padding:8px 12px;margin-top:8px;border:1px solid #dbb992;background:white;border-radius:4px} [hidden]{display:none!important}
@media(min-width:1600px){.main{padding-inline:65px}.content-layout{gap:40px;grid-template-columns:minmax(0,1fr) 185px}.reader{padding:35px 48px}}
@media(max-width:1200px){.workspace{grid-template-columns:265px minmax(0,1fr)}.main{padding:26px 30px}.outline{display:none}.content-layout{display:block}.lesson-heading h2{font-size:27px}}
@media(max-width:760px){.topbar{height:60px;padding:0 18px}.brand{font-size:16px}.brand b{font-size:12px;margin-left:8px}.topbar nav{gap:12px;font-size:11px}.topbar nav a:not(:first-child){display:none}.workspace{display:block}.main{padding:20px 17px 32px}.sidebar{display:none;position:fixed;top:60px;left:0;bottom:0;width:min(330px,88vw);height:calc(100dvh - 60px);z-index:40;padding:24px 20px}.sidebar.open{display:block}.mobile-only{display:inline-block}.icon-btn{background:transparent;font-size:27px;color:var(--muted);padding:4px 8px}.breadcrumb>button{background:white;padding:9px 11px;border:1px solid var(--line);border-radius:6px;font-size:11px;color:#586775}.breadcrumb>span:not(.course-number){display:none}.lesson-heading{padding:27px 0 24px}.lesson-heading h2{font-size:24px;line-height:1.55;margin:10px 0 12px}.lesson-heading>p{font-size:12px;line-height:1.85}.reader{padding:23px 20px 30px;font-size:14px}.reader h1{font-size:21px}.reader h2{font-size:18px}.reading-toolbar{padding:14px 19px}.resource{padding:12px;gap:10px}.resource b{font-size:12px}.primary,.secondary{padding:11px 15px}.backdrop{position:fixed;inset:60px 0 0;background:#17252c66;z-index:30}.standalone{padding:20px 12px}.source-note{font-size:10px}.reader th,.reader td{min-width:90px}}
@media(prefers-reduced-motion:no-preference){a,button{transition:background .16s,color .16s,border-color .16s}}
@media print{.topbar,.sidebar,.breadcrumb,.outline,.materials,.lesson-actions,.progress-note,.back-link{display:none!important}.workspace,.content-layout{display:block}.main{padding:0}.reader-section{border:0}.reader{padding:0}.standalone{max-width:none}.standalone>.reader{border:0}}

/* Curriculum revision 2026-09-07 */
[hidden]{display:none!important}.practice-note{padding:16px 20px;border-left:3px solid #bc572c;background:#fff5ee;margin:20px 0;line-height:1.8}.worksheet-wrap{overflow-x:auto;max-width:100%}.reader table.worksheet{width:100%;table-layout:fixed}.worksheet th:first-child{width:40%}.worksheet td,.worksheet th{overflow-wrap:anywhere}.reader .worksheet-download{display:inline-block;padding:10px 15px;border:1px solid #bc572c;border-radius:7px;color:#9d4522;margin:12px 0}.reader details.lesson-quiz{padding:16px;border:1px solid #e7eaee;margin-top:20px}.reader details.lesson-quiz summary{cursor:pointer;font-weight:600}.reader .source-list a{overflow-wrap:anywhere;text-decoration:underline}.revision-meta{font-size:13px;color:#687482}@media print{.worksheet-download,.back-link{display:none}.reader{max-width:none}.worksheet td{height:30px}}
/* 3D course long-title and narrow-screen containment */
.lesson-heading h2,.resource-copy b{overflow-wrap:anywhere;word-break:break-word}
@media(max-width:760px){.main,.lesson-heading,.content-layout,.reading-column,.reader-section{max-width:100%;min-width:0}.lesson-heading h2{word-break:break-all}.resource-copy{min-width:0}}

.reader.reader-embed{padding:0;height:min(78vh,920px);overflow:hidden}.reader-embed iframe{display:block;width:100%;height:100%;border:0;background:#f4f0ea}@media(max-width:760px){.reader.reader-embed{height:74vh}}

/* ChatCut course 2026-09-24 */
.chatcut-course .course-kicker{font-size:10px;letter-spacing:1.7px;font-weight:750;color:#b4572d;margin:0 0 8px}.chatcut-course .course-lead{font-size:16px;line-height:2;color:#394754;margin-bottom:24px}.chatcut-course .course-toc{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin:24px 0 34px;padding:16px;background:#faf7f3;border:1px solid #eadfd4;border-radius:10px}.chatcut-course .course-toc a{display:block;padding:8px 10px;border-radius:6px;background:#fff;color:#7f4529;text-decoration:none;font-size:12px;line-height:1.55}.chatcut-course .course-toc a:hover{background:#fff0e5}.reader .prompt-block{background:#18212b;color:#f3f7fa;border:1px solid #283848;padding:18px 20px;border-radius:8px;line-height:1.75;white-space:pre-wrap;overflow-wrap:anywhere}.reader .prompt-block code{color:inherit}.chatcut-course table code{white-space:nowrap}.chatcut-course h2{border-top:1px solid #ece6e1;padding-top:30px}.chatcut-course h2:first-of-type{border-top:0}@media(max-width:760px){.chatcut-course .course-toc{grid-template-columns:1fr 1fr;padding:11px}.chatcut-course .course-lead{font-size:15px}.reader .prompt-block{padding:15px 14px;font-size:11px}.chatcut-course table code{white-space:normal}}

/* TikTok video script and data course 2026-09-24 */
.video-script-course .course-kicker{font-size:10px;letter-spacing:1.7px;font-weight:750;color:#b4572d;margin:0 0 8px}.video-script-course .course-toc{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin:24px 0 34px;padding:16px;background:#faf7f3;border:1px solid #eadfd4;border-radius:10px}.video-script-course .course-toc a{display:block;padding:8px 10px;border-radius:6px;background:#fff;color:#7f4529;text-decoration:none;font-size:12px;line-height:1.55}.video-script-course .course-toc a:hover{background:#fff0e5}.video-script-course h2{border-top:1px solid #ece6e1;padding-top:30px}.video-script-course h2:first-of-type{border-top:0}.video-script-course>blockquote:first-of-type{font-size:13px;background:#fff7ed;border-left-color:#c96c3a}.video-script-course table code{white-space:nowrap}@media(max-width:760px){.video-script-course .course-toc{grid-template-columns:1fr 1fr;padding:11px}.video-script-course table code{white-space:normal}}

/* GMV Max creative testing course 2026-09-27. Kept in the shared stylesheet because
   Academy inserts only the source article and intentionally discards the document head. */
.reader.test-course{box-sizing:border-box;width:100%;max-width:940px;margin-inline:auto;padding:28px 38px 78px;color:#27323a;line-height:1.88;overflow-wrap:anywhere}
.test-course *{box-sizing:border-box}
.test-course .course-hero{padding:42px;border-radius:18px;background:linear-gradient(140deg,#202725,#293632);color:#f7f2ea;box-shadow:0 18px 48px rgba(20,30,28,.13)}
.test-course .course-kicker{color:#ee965e;font-size:12px;font-weight:800;letter-spacing:.14em}
.test-course .course-hero h1{margin:12px 0!important;color:#fff!important;font-size:clamp(31px,5vw,48px)!important;line-height:1.18!important}
.test-course .course-hero p{color:#dce2de;margin:0;font-size:16px}
.test-course .course-toc{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin:28px 0;padding:14px;border:1px solid #dfe5e1;border-radius:12px;background:#f7f8f5}
.reader.test-course .course-toc a{display:flex;align-items:center;min-height:48px;padding:10px 12px;border:1px solid #e1e6e3;border-radius:8px;background:#fff;color:#35413d!important;text-decoration:none!important;font-size:13px;font-weight:700;line-height:1.45}
.reader.test-course .course-toc a:hover{border-color:#d4ad91;background:#fff8f2;color:#9a4c27!important}
.test-course h2{margin:54px 0 20px!important;padding-top:28px;border-top:1px solid #dde3df;font-size:28px!important;color:#17221e!important;scroll-margin-top:24px}
.test-course h3{margin:30px 0 10px!important;color:#704129!important;font-size:20px!important}
.test-course p,.test-course li{font-size:16px;line-height:1.9}
.test-course table{display:block;width:100%;overflow:auto;border-collapse:collapse;margin:22px 0}
.test-course th,.test-course td{padding:12px 13px;border:1px solid #d9dfdc;text-align:left;vertical-align:top;min-width:126px}
.test-course th{background:#edf2ef;color:#1d2925}
.test-course .practice-note{margin:22px 0;padding:18px 20px;border:1px solid #e2c3af;border-left:4px solid #bc572c;border-radius:10px;background:#fff8f1}
.test-course .formula{padding:18px 20px;background:#25313a;color:#fff;border-radius:10px;margin:18px 0;font-size:17px;text-align:center}
.test-course .formula strong{color:#91e2d2}
.test-course .decision{padding:18px 20px;border-radius:10px;background:#edf5f0;border:1px solid #cbded1;margin:18px 0}
.test-course .warning{padding:18px 20px;border-radius:10px;background:#fff4ed;border:1px solid #edcfbd;margin:18px 0}
.test-course .checklist{list-style:none;padding-left:0}
.test-course .checklist li{position:relative;padding-left:30px;margin:9px 0}
.test-course .checklist li:before{content:"□";position:absolute;left:2px;color:#b95931;font-size:20px;font-weight:800}
.test-course .status{display:inline-block;padding:3px 8px;border-radius:99px;background:#edf2ef;color:#315345;font-size:12px;font-weight:700;white-space:nowrap}
.test-course .source-list a{overflow-wrap:anywhere}
@media(max-width:720px){
  .reader.test-course{padding:16px 16px 54px}
  .test-course .course-hero{padding:28px 22px}
  .test-course .course-toc{grid-template-columns:1fr 1fr;gap:8px;padding:10px}
  .reader.test-course .course-toc a{min-height:46px;padding:9px 10px;font-size:12px}
  .test-course h2{font-size:24px!important}
  .test-course p,.test-course li{font-size:15px}
  .test-course th,.test-course td{min-width:118px}
}
@media(max-width:420px){.test-course .course-toc{grid-template-columns:1fr}}

/* SEA shipping and after-sales: keep anchor headings below the sticky header. */
.reader.sea-policy-course h1,.reader.sea-policy-course h2,.reader.sea-policy-course h3{scroll-margin-top:110px}