/* finesse · register:product · soul:editorial-learning · palette:avatar-yellow-purple · layout:reading-rail · motion:feedback */
:root{--bg:#fafaf7;--surface:#fffffd;--ink:#25212f;--text:#36333f;--muted:#5b5767;--blue:#6545d1;--action:#5937b9;--soft:#f0ebff;--line:rgba(51,39,75,.16);--navy:#302345;--on-dark:#fffef6;--dark-muted:#e5ddf5;--warn:#614812;--warn-bg:#fff6cf;--shadow:0 12px 36px rgba(50,30,87,.065);--decor-dot:rgba(89,55,185,.16);--decor-purple:rgba(89,55,185,.13);--decor-yellow:rgba(233,194,17,.32);--yellow:#ffe747;--yellow-hover:#f5d92c;--yellow-soft:#fff8d7;--violet:#5937b9;--cover-line:rgba(37,33,47,.2);--font:"Microsoft YaHei","微软雅黑","PingFang SC",sans-serif;--nav-h:76px}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px;overflow-x:clip}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.85 var(--font);overflow-x:clip}a{color:var(--action);text-decoration:none}a:hover{text-decoration:underline}button,input,select,textarea{font:inherit}code,kbd,pre,samp{font-family:var(--font)}button,a,input{ -webkit-tap-highlight-color:transparent}a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid var(--blue);outline-offset:5px}a,button{touch-action:manipulation}h1,h2,h3,p{margin:0}h1,h2,h3{color:var(--ink);text-wrap:balance;overflow-wrap:anywhere}h1{font-size:48px;line-height:1.3;letter-spacing:-.045em;font-weight:700}h2{font-size:26px;line-height:1.5;letter-spacing:-.025em}h3{font-size:17px;line-height:1.6}p{margin:12px 0}small,.small{font-size:13px;color:var(--muted)}.wrap{width:min(1200px,calc(100% - 80px));margin:auto}.skip{position:fixed;left:16px;top:-80px;z-index:100;background:var(--surface);padding:12px}.skip:focus{top:12px}
.site-header{height:var(--nav-h);border-bottom:1px solid var(--line);background:var(--surface);position:sticky;top:0;z-index:30}.header-inner{height:100%;display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{display:flex;align-items:center;gap:12px;color:var(--ink);font-weight:700;white-space:nowrap}.brand:hover{text-decoration:none}.brand-mark{display:grid;place-items:center;background:var(--navy);color:var(--on-dark);width:38px;height:38px;border-radius:11px;font-size:16px;letter-spacing:-1px}.brand small{display:block;font-size:10px;letter-spacing:.18em;line-height:1.4;font-weight:400}.header-nav{display:flex;align-items:center;gap:30px;font-size:14px}.header-nav a{min-height:44px;display:flex;align-items:center;white-space:nowrap;color:var(--text)}.header-nav a[aria-current=page]{color:var(--action);font-weight:700}.header-note{font-size:12px;color:var(--muted);border-left:1px solid var(--line);padding-left:25px}
.eyebrow,.kicker{font-size:11px;letter-spacing:.15em;font-weight:700;color:var(--action)}.pill,.tag,.status{display:inline-flex;align-items:center;gap:7px;padding:4px 10px;border-radius:6px;font-size:12px;line-height:1.7;background:var(--soft);color:var(--action);white-space:nowrap}.pills{display:flex;flex-wrap:wrap;gap:8px;margin-top:23px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:20px;min-height:48px;padding:11px 21px;background:var(--action);border:1px solid transparent;border-radius:9px;color:var(--on-dark);font-size:14px;font-weight:700;white-space:nowrap;transition:background .18s,transform .18s}.btn:hover{background:var(--navy);text-decoration:none}.btn:active{transform:translateY(1px)}.btn.secondary{background:var(--surface);color:var(--ink);border-color:var(--line)}.text-link{display:inline-flex;align-items:center;min-height:44px;font-size:14px;font-weight:700;gap:12px;white-space:nowrap}
/* Course collection */
.home-main{padding:52px 0 70px}.welcome{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(0,1fr);gap:65px;align-items:center;padding:0 0 47px}.welcome h1{margin:17px 0}.welcome h1 span{color:var(--action)}.welcome p{max-width:620px;color:var(--muted);font-size:16px}.welcome-actions{display:flex;gap:12px;align-items:center;margin-top:26px}.learning-map{padding:26px 30px;border-left:1px solid var(--line)}.map-label{font-size:13px;font-weight:700;color:var(--ink);margin-bottom:20px}.map-step{position:relative;display:flex;gap:17px;padding:0 0 22px}.map-step:last-child{padding-bottom:0}.map-step:not(:last-child):before{content:"";position:absolute;left:16px;top:36px;bottom:4px;border-left:1px solid var(--line)}.map-num{flex:0 0 34px;height:34px;display:grid;place-items:center;border:1px solid var(--line);border-radius:50%;font-size:12px;color:var(--muted);background:var(--surface)}.map-step:first-of-type .map-num{background:var(--action);color:var(--on-dark)}.map-step strong{font-size:14px;color:var(--ink)}.map-step p{font-size:12px;margin:1px 0 0}.collection-header{border-top:1px solid var(--line);padding-top:30px;margin-bottom:23px;display:flex;align-items:center;gap:18px}.collection-header h2{font-size:23px}.collection-header span{font-size:12px;color:var(--muted)}.featured-course{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.4fr);background:var(--surface);border:1px solid var(--line);border-radius:20px;overflow:hidden;box-shadow:var(--shadow)}.course-cover{position:relative;padding:34px 38px;background:var(--navy);color:var(--on-dark);display:flex;flex-direction:column;justify-content:space-between;min-height:315px;overflow:hidden}.cover-top{font-size:11px;letter-spacing:.17em;color:var(--dark-muted);display:flex;justify-content:space-between}.cover-number{position:absolute;font-size:185px;line-height:1;right:20px;top:45px;font-weight:700;letter-spacing:-.09em;opacity:.1}.cover-title{font-size:29px;line-height:1.5;font-weight:700;position:relative;margin:33px 0 22px}.cover-bottom{border-top:1px solid rgba(245,248,254,.2);padding-top:15px;font-size:12px;color:var(--dark-muted);display:flex;justify-content:space-between}.course-description{padding:33px 40px;display:flex;flex-direction:column;align-items:flex-start}.course-description h3{font-size:25px;margin-top:13px}.course-description p{font-size:14px;max-width:540px;color:var(--muted)}.course-meta{display:flex;flex-wrap:wrap;gap:18px;font-size:12px;color:var(--muted);margin:0 0 19px}.course-description .text-link{margin-top:auto}.placeholder-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;margin-top:21px}.placeholder{padding:24px;background:transparent;border:1px dashed var(--line);border-radius:15px;min-height:176px;position:relative}.placeholder .slot{font-size:12px;color:var(--muted);display:flex;justify-content:space-between}.placeholder h3{margin:23px 0 6px;color:var(--muted);font-size:18px;font-weight:400}.placeholder p{font-size:13px;color:var(--muted);margin:0}.home-tip{margin-top:36px;font-size:13px;padding:18px 0;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:22px}.home-tip strong{color:var(--ink)}
/* Long-form reading */
.breadcrumb{display:flex;align-items:center;gap:12px;min-height:65px;font-size:12px;color:var(--muted);flex-wrap:wrap}.breadcrumb a{display:inline-flex;align-items:center;min-height:44px;white-space:nowrap}.hero{background:var(--bg);position:relative}.hero-in{padding:20px 0 40px;border-bottom:1px solid var(--line);display:grid;grid-template-columns:240px minmax(0,1fr);gap:50px}.lesson-label{padding-top:9px}.lesson-label span{display:block;color:var(--action);font-size:12px;letter-spacing:.16em}.lesson-label strong{display:block;font-size:88px;line-height:1.15;letter-spacing:-.07em;color:var(--ink);font-weight:400;margin:12px 0}.lesson-label p{font-size:12px;color:var(--muted);margin:0}.hero h1{font-size:42px;margin:0 0 15px}.hero h1 br{display:none}.hero p{max-width:700px;font-size:15px;color:var(--muted)}main.lesson-main{padding-top:34px;padding-bottom:65px}.grid{display:grid;grid-template-columns:240px minmax(0,1fr);gap:50px;align-items:start}.nav{position:sticky;top:102px;max-height:calc(100dvh - 124px);overflow-y:auto;padding:0 18px 15px 0}.nav small{font-size:11px;letter-spacing:.08em;display:block;margin:0 0 16px;color:var(--muted)}.nav a{display:flex;align-items:center;min-height:44px;padding:10px 12px;font-size:13px;color:var(--muted);border-radius:7px;gap:14px;margin:3px 0;white-space:nowrap}.nav b{font-size:11px;font-weight:400;color:var(--muted);font-variant-numeric:tabular-nums}.nav a:hover,.nav a[aria-current=location]{background:var(--soft);text-decoration:none;color:var(--action)}.nav a[aria-current=location]{font-weight:700}.nav-progress{padding:24px 12px 10px;margin-top:23px;border-top:1px solid var(--line)}.nav-progress p{font-size:12px;margin:0 0 10px}.nav-progress strong{color:var(--ink)}.content{min-width:0}.card{scroll-margin-top:100px;padding:35px 0;border-bottom:1px solid var(--line)}.card:first-child{padding-top:0}.card:last-child{border-bottom:0;padding-bottom:0}.card p{font-size:16px;line-height:1.95}.card .lead{font-size:15px}.kicker{margin-bottom:9px}.head{display:flex;align-items:flex-start;gap:14px;margin-bottom:19px}.num{width:36px;height:36px;flex:0 0 36px;border:1px solid var(--line);border-radius:9px;display:grid;place-items:center;font-size:12px;color:var(--action);margin-top:3px}.head h2{margin:0}.sub{font-size:13px;color:var(--muted);margin-top:3px}.goals{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;margin-top:23px}.goal{font-size:13px;color:var(--muted);padding-top:14px;border-top:2px solid var(--line)}.goal strong{display:block;font-size:15px;color:var(--ink);margin-bottom:6px}.two{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin:21px 0}.mini{padding:23px;background:var(--surface);border:1px solid var(--line);border-radius:13px}.mini h3{margin-bottom:10px}.mini p{font-size:15px;margin:0}.note{padding:17px 21px;background:var(--soft);border-radius:10px;margin:21px 0;font-size:14px;line-height:1.9;color:var(--text)}.note.gold{background:var(--warn-bg);color:var(--warn)}.resource{margin:21px 0}.res{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:12px 24px;padding:26px;background:var(--surface);border:1px solid var(--line);border-radius:15px}.res-top{display:flex;gap:14px;align-items:center;grid-column:1/-1}.ico{background:var(--soft);color:var(--action);width:46px;height:46px;border-radius:12px;display:grid;place-items:center;font-size:23px;flex:0 0 46px}.res .tag{background:transparent;padding:0;font-size:11px}.res p{font-size:14px;margin:0}.res .btn{align-self:center;gap:8px}.url{grid-column:1/-1;font-size:12px;color:var(--muted);overflow-wrap:anywhere;border-top:1px solid var(--line);padding-top:10px}.card p.small{font-size:12px;line-height:1.9;color:var(--muted)}.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:12px;background:var(--surface);margin:24px 0}table{width:100%;border-collapse:collapse;font-size:13px;line-height:1.85;text-align:left}th,td{padding:16px 18px;border-bottom:1px solid var(--line);vertical-align:top}th{font-weight:700;background:var(--soft);color:var(--ink)}th:first-child{width:18%}td:first-child{color:var(--ink);font-weight:700}tr:last-child td{border-bottom:0}.steps{margin:18px 0;display:grid;gap:13px}.step{font-size:14px;position:relative;padding-left:39px}.step>b{position:absolute;left:0;top:2px;color:var(--action);font-size:11px;border:1px solid var(--line);border-radius:6px;width:27px;height:27px;text-align:center;line-height:25px}code{background:var(--soft);padding:2px 7px;border-radius:4px}.checks{display:grid;gap:9px;margin:22px 0}.check{display:flex;gap:14px;align-items:flex-start;padding:16px 18px;background:var(--surface);border:1px solid var(--line);border-radius:10px;font-size:14px;cursor:pointer;transition:background .15s,border-color .15s;min-height:58px}.check:hover{border-color:var(--blue)}.check:has(input:checked){background:var(--soft);border-color:var(--blue)}.check input{width:18px;height:18px;flex:0 0 18px;margin:4px 0 0;accent-color:var(--action)}.progress{height:5px;background:var(--line);border-radius:5px;overflow:hidden}.progress span{display:block;height:100%;width:0;background:var(--action);transition:width .2s}.progress-row{display:flex;justify-content:space-between;align-items:center;gap:14px}.progress-row p{margin:8px 0}.reset{background:transparent;border:0;color:var(--muted);font-size:12px;min-height:44px;cursor:pointer;white-space:nowrap}.reset:hover{color:var(--action);text-decoration:underline}.end-nav{margin-top:35px;padding:24px;background:var(--navy);color:var(--on-dark);border-radius:13px;display:flex;align-items:center;justify-content:space-between;gap:20px}.end-nav strong{font-size:16px}.end-nav p{font-size:12px;margin:4px 0 0;color:var(--dark-muted)}.end-nav a{color:var(--on-dark)}.footer{border-top:1px solid var(--line);padding:36px 0;background:var(--surface)}.footer h2{font-size:20px}.footer p{font-size:13px;color:var(--muted)}.sources{font-size:12px;line-height:2.1;color:var(--muted)}.sources a{display:inline-flex;align-items:center;min-height:44px}.sources summary{cursor:pointer;min-height:44px;display:flex;align-items:center;color:var(--ink)}.sources summary:before{content:"＋";margin-right:10px}.sources[open] summary:before{content:"−"}.footer-bottom{display:flex;justify-content:space-between;gap:20px;font-size:12px;color:var(--muted)}.top{position:fixed;right:24px;bottom:24px;min-height:44px;padding:10px 15px;background:var(--surface);border:1px solid var(--line);border-radius:9px;color:var(--ink);font-size:12px;cursor:pointer;box-shadow:var(--shadow);z-index:20}

/* Avatar-led identity: yellow calls to action, purple structure, high-contrast reading. */
.brand-avatar{width:46px;height:46px;object-fit:cover;border-radius:13px;border:2px solid var(--yellow);flex-shrink:0}
.site-header{border-bottom:3px solid var(--yellow)}
.brand small{color:var(--muted)}
.header-nav a[aria-current=page]{border-bottom:2px solid var(--action)}
.btn{background:var(--yellow);color:var(--ink);border-color:var(--cover-line);box-shadow:0 3px 0 var(--cover-line)}
.btn:hover{background:var(--yellow-hover);color:var(--ink)}
.btn.secondary{box-shadow:none}
.welcome h1 span{color:var(--action);text-decoration:underline;text-decoration-color:var(--yellow);text-decoration-thickness:8px;text-underline-offset:7px}
.learning-map{background:var(--violet);border:0;border-radius:20px;padding:27px 29px;color:var(--on-dark)}
.learning-map .author-card{display:flex;align-items:center;gap:14px;padding-bottom:22px;margin-bottom:24px;border-bottom:1px solid var(--dark-muted)}
.author-card img{border-radius:15px;border:2px solid var(--yellow);object-fit:cover;flex-shrink:0}
.learning-map .author-card strong{font-size:17px;display:block;color:var(--on-dark)}
.author-card span{display:block;font-size:12px;color:var(--dark-muted);margin-top:4px;font-weight:400}
.learning-map .map-step strong{color:var(--on-dark)}
.learning-map .map-step p{color:var(--dark-muted)}
.learning-map .map-num{background:var(--yellow);color:var(--ink);border:0;font-weight:700}
.learning-map .map-step:not(:last-child):before{border-color:var(--dark-muted)}
.course-cover{background:var(--yellow);color:var(--ink)}
.cover-top,.cover-bottom{color:var(--ink)}
.cover-bottom{border-color:var(--cover-line)}
.cover-title{font-weight:700}.cover-number{color:var(--action);opacity:.16}
.status{background:var(--yellow-soft);color:var(--ink);border:1px solid var(--cover-line);font-weight:700}
.placeholder{background:var(--surface)}
.hero{background:var(--surface)}
.hero-in{border-bottom:2px solid var(--yellow)}
.lesson-label strong{color:var(--action)}
.lesson-label span{background:var(--yellow);color:var(--ink);display:inline-block;padding:3px 8px;border-radius:4px;font-weight:700}
.num{background:var(--yellow);border-color:var(--cover-line);color:var(--ink);font-weight:700}
.goal{border-top-color:var(--yellow)}
.nav a[aria-current=location]{background:var(--yellow);color:var(--ink)}
.nav a[aria-current=location] b{color:var(--ink)}
.check:has(input:checked){background:var(--yellow-soft);border-color:var(--action)}
.home-tip strong{color:var(--action)}
.footer{border-top:3px solid var(--yellow)}

@media(min-width:1600px){.wrap{width:min(1280px,calc(100% - 100px))}.grid,.hero-in{grid-template-columns:250px minmax(0,1fr);gap:65px}}
@media(max-width:1000px){.wrap{width:calc(100% - 48px)}.grid,.hero-in{grid-template-columns:190px minmax(0,1fr);gap:30px}.hero h1{font-size:35px}.welcome{gap:25px}.welcome h1{font-size:40px}.course-cover{padding:30px}.course-description{padding:28px}.res{grid-template-columns:minmax(0,1fr)}.res .btn{justify-self:start}.two{gap:12px}.mini{padding:18px}}
@media(max-width:768px){:root{--nav-h:66px}.header-note{display:none}.header-nav{gap:18px}.welcome{grid-template-columns:minmax(0,1fr);padding-bottom:30px;gap:25px}.learning-map{border-left:0;border-top:1px solid var(--line);padding:20px 0 0;display:flex;gap:18px}.map-label{display:none}.map-step{flex:1;display:block;padding:0}.map-step:not(:last-child):before{display:none}.map-num{margin-bottom:8px}.map-step p{font-size:11px}.featured-course{grid-template-columns:minmax(0,1fr)}.course-cover{min-height:240px}.cover-title{margin:22px 0;font-size:28px}.cover-number{top:30px;font-size:175px}.placeholder-grid{gap:12px}.placeholder{padding:17px;min-height:155px}.placeholder h3{font-size:16px}.grid{grid-template-columns:minmax(0,1fr);gap:28px}.hero-in{grid-template-columns:minmax(0,1fr);gap:15px;padding-top:10px;padding-bottom:28px}.lesson-label{display:flex;gap:12px;align-items:center;padding:0}.lesson-label strong{font-size:18px;letter-spacing:0;margin:0}.lesson-label span{font-size:10px}.lesson-label p{display:none}.hero h1{font-size:34px}.nav{position:static;max-height:none;padding:17px;background:var(--surface);border:1px solid var(--line);border-radius:12px}.nav nav{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 5px}.nav small{margin-bottom:6px}.nav a{margin:0;padding:8px;font-size:12px;gap:7px}.nav-progress{display:none}.card{scroll-margin-top:85px}.goals{gap:15px}.top{right:12px;bottom:12px}.home-main{padding-top:35px}.home-tip{display:block}.home-tip span{display:block;margin-top:4px}}
@media(max-width:480px){.wrap{width:calc(100% - 36px)}.brand{font-size:14px;gap:8px}.brand-mark{width:33px;height:33px;border-radius:9px;font-size:14px}.brand small{font-size:8px}.header-nav{gap:12px;font-size:12px}.header-nav .optional{display:none}.welcome h1{font-size:35px;line-height:1.4;margin:14px 0}.welcome p{font-size:14px}.welcome-actions{gap:10px}.btn{font-size:13px;padding:10px 15px}.welcome-actions .text-link{font-size:12px}.map-step strong{font-size:12px}.map-step p{font-size:11px}.learning-map{gap:12px}.collection-header{gap:10px;flex-wrap:wrap}.collection-header h2{font-size:21px}.course-cover{padding:24px;min-height:228px}.course-description{padding:24px}.course-description h3{font-size:22px}.placeholder-grid{grid-template-columns:minmax(0,1fr)}.placeholder{min-height:115px;padding:20px}.placeholder h3{margin-top:9px}.breadcrumb{font-size:11px;gap:8px}.hero h1{font-size:30px}.hero h1 br{display:block}.hero p{font-size:14px}.pill{font-size:10px}.pills{gap:6px;margin-top:18px}.card{padding:28px 0}.card p{font-size:15px}h2{font-size:23px}.head{gap:10px}.head h2{font-size:22px}.sub{font-size:12px}.num{width:31px;height:31px;flex-basis:31px;font-size:11px}.two{grid-template-columns:minmax(0,1fr)}.goals{grid-template-columns:minmax(0,1fr);gap:12px}.goal{padding-top:12px}.goal strong{display:inline;margin-right:10px;font-size:14px}.note{padding:16px;font-size:13px}.res{padding:19px;gap:15px}.res h3{font-size:16px}.res .btn{width:100%;font-size:12px}.res p{font-size:13px}.ico{width:38px;height:38px;flex-basis:38px}.check{font-size:13px;padding:15px}.end-nav{display:block;padding:20px}.end-nav a{margin-top:12px}.footer-bottom{display:block}.sources a{font-size:11px;line-height:1.6}.sources span{display:block}th,td{padding:11px 8px;font-size:11px;overflow-wrap:anywhere}th:first-child{width:20%}.top{font-size:11px;padding:8px 11px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}
@media print{.site-header,.nav,.top,.reset,.skip,.breadcrumb{display:none}body{background:var(--surface);font-size:12px}.wrap{width:100%}.grid,.hero-in{display:block}.lesson-label{display:none}.card{break-inside:avoid}.footer{break-before:page}.hero h1{font-size:28px}.btn,.course-cover{-webkit-print-color-adjust:exact;print-color-adjust:exact}}

@media(max-width:768px){.learning-map{padding:23px;border:0;gap:18px}.learning-map .author-card{display:none}.map-step strong{font-size:13px}.map-step p{font-size:12px}}
@media(max-width:480px){.brand-avatar{width:39px;height:39px;border-radius:11px}.learning-map{padding:20px 16px;gap:12px}.learning-map .map-step strong{font-size:12px}.learning-map .map-step p{font-size:11px}.welcome h1 span{text-decoration-thickness:6px;text-underline-offset:6px}.card .lead{font-size:15px}}

/* TikTok collection and illustrated articles; uses the existing avatar palette. */
.topic-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;margin-top:22px}
.topic-tile{display:flex;flex-direction:column;align-items:flex-start;border:1px solid var(--line);background:var(--surface);padding:27px;border-radius:16px;min-width:0;color:var(--text)}
a.topic-tile:hover{text-decoration:none;border-color:var(--action)}
.topic-tile h3{font-size:21px;margin-top:18px}.topic-tile p{font-size:14px;margin:12px 0 20px}.topic-tile .text-link{margin-top:auto;color:var(--action)}
.pending{background:transparent;border-style:dashed}.slot-label,.pending-label{font-size:12px;color:var(--muted)}.pending-label{margin-top:auto;min-height:44px;display:flex;align-items:center}
.category-main{padding:15px 0 65px}.category-heading{padding:16px 0 30px}.category-heading h1{margin:13px 0;font-size:43px}.category-heading p{font-size:17px;color:var(--muted)}
.route-note{display:flex;flex-wrap:wrap;align-items:center;gap:10px 24px;background:var(--yellow-soft);border:1px solid var(--line);border-radius:12px;padding:21px 25px;margin:0 0 29px}.route-note strong{color:var(--ink)}.route-note p{margin:0;font-size:13px}.route-note .text-link{margin-left:auto}
.category-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.category-tile{display:flex;flex-direction:column;align-items:flex-start;min-width:0;background:var(--surface);padding:28px;border:1px solid var(--line);border-radius:17px;color:var(--text);transition:border-color .18s,background .18s}.category-tile:hover{border-color:var(--action);text-decoration:none;background:var(--yellow-soft)}
.category-top{display:flex;justify-content:space-between;align-items:center;width:100%;font-size:12px;color:var(--muted);margin-bottom:19px}.category-top b{background:var(--yellow);border-radius:8px;min-width:36px;height:36px;display:grid;place-items:center;color:var(--ink)}.category-tile h2{font-size:23px}.category-tile p{font-size:14px;margin:10px 0 23px}.category-open{font-size:13px;font-weight:700;color:var(--action);margin-top:auto}
.guide-content h2{margin-bottom:18px}.guide-steps{padding-left:25px;margin:20px 0}.guide-steps li{padding:0 0 13px 9px;line-height:1.95}.guide-steps li::marker{font-weight:700;color:var(--action)}
.guide-figure{margin:23px 0;padding:16px;background:var(--surface);border:1px solid var(--line);border-radius:13px;min-width:0}.zoom-link{display:flex;align-items:center;flex-direction:column;gap:11px}.zoom-link img{max-width:100%;width:auto;height:auto;max-height:540px;object-fit:contain;display:block;border-radius:6px}.zoom-link span{font-size:12px;min-height:30px;display:flex;align-items:center;color:var(--action)}.guide-figure figcaption{font-size:12px;color:var(--muted);line-height:1.8;border-top:1px solid var(--line);padding-top:12px;margin-top:6px}
.guide-gallery{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;align-items:start}.guide-gallery .guide-figure{margin:18px 0}.guide-gallery .zoom-link img{max-height:440px}
.experience{background:var(--surface);border:1px solid var(--line);border-radius:11px;margin:19px 0}.experience summary{min-height:52px;padding:13px 18px;cursor:pointer;color:var(--action);font-size:14px}.experience>div{padding:0 20px 17px}.experience p{font-size:14px}
.app-list{display:grid;gap:0;background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:0 22px;margin-top:20px}.app-list>div{padding:17px 0;border-bottom:1px solid var(--line)}.app-list>div:last-child{border:0}.app-list strong{color:var(--ink)}.app-list p{margin:4px 0;font-size:14px}
.guide-nav-back{border-top:1px solid var(--line);margin-top:20px;padding-top:17px}.guide-nav-back a{font-size:12px}
.guide-nav nav a{font-size:12px;padding:10px 8px;gap:8px}.guide-nav nav b{display:none}
.guide-pagination{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px;margin-top:34px}.guide-pagination a{padding:20px;background:var(--yellow-soft);border:1px solid var(--line);border-radius:10px;color:var(--ink);min-width:0}.guide-pagination small{display:block;color:var(--action);margin-bottom:7px}.guide-pagination strong{font-size:14px}.guide-pagination a:hover{border-color:var(--action);text-decoration:none}
.image-dialog{width:min(1040px,94vw);max-width:94vw;max-height:90dvh;padding:0 20px 20px;border:1px solid var(--line);border-radius:14px;background:var(--surface);color:var(--text);overflow:auto;overscroll-behavior:contain}.image-dialog::backdrop{background:rgba(23,17,38,.85)}.image-dialog-toolbar{position:sticky;top:0;left:0;display:flex;align-items:center;justify-content:space-between;gap:16px;background:var(--surface);min-height:65px;padding:10px 0;z-index:1}.image-dialog-toolbar span{font-size:14px}.image-dialog-toolbar button{border:1px solid var(--line);background:var(--yellow);color:var(--ink);border-radius:8px;min-height:44px;padding:8px 18px;white-space:nowrap;cursor:pointer}.image-dialog .full-image{display:block;max-width:none;height:auto;margin:0 auto}.image-dialog>p{font-size:12px;margin:15px 0 0}
@media(max-width:1000px){.topic-grid{gap:14px}.topic-tile{padding:21px}.topic-tile h3{font-size:18px}.guide-nav nav a{font-size:11px;padding-left:5px;padding-right:5px}}
@media(max-width:768px){.topic-grid{grid-template-columns:minmax(0,1fr)}.category-heading h1{font-size:36px}.category-grid{gap:14px}.category-tile{padding:21px}.category-tile h2{font-size:21px}.guide-nav nav a{font-size:12px}.guide-nav-back{margin-top:12px;padding-top:10px}}
@media(max-width:480px){.category-grid,.guide-gallery{grid-template-columns:minmax(0,1fr)}.category-heading h1{font-size:30px}.category-heading p{font-size:15px}.route-note{padding:18px}.route-note .text-link{margin-left:0}.category-tile{padding:23px}.guide-steps{padding-left:22px;font-size:15px}.guide-figure{padding:12px}.guide-pagination a{padding:14px}.guide-pagination strong{font-size:12px}.image-dialog{padding:0 12px 15px}.image-dialog-toolbar span{font-size:12px}.guide-gallery .zoom-link img{max-height:520px}}
@media print{.image-dialog,.zoom-link span{display:none}.guide-figure{break-inside:avoid}.guide-gallery{display:block}.experience{display:block}}

@media(max-width:480px){.guide-nav nav,.guide-pagination{grid-template-columns:minmax(0,1fr)}}

/* Larger article directories across GPT and TikTok pages. */
.nav small{font-size:16px;margin-bottom:18px}
.nav a{font-size:18px;min-height:52px;padding-top:12px;padding-bottom:12px;line-height:1.7}
.nav b{font-size:16px}
.nav-progress p{font-size:17px}
.guide-nav nav a{font-size:17px;min-height:52px;padding-top:12px;padding-bottom:12px;line-height:1.7}
.guide-nav-back a{font-size:17px}
@media screen and (min-width:769px){.grid,.hero-in{grid-template-columns:285px minmax(0,1fr);gap:40px}}
@media screen and (min-width:769px) and (max-width:1000px){.grid,.hero-in{grid-template-columns:250px minmax(0,1fr);gap:25px}.guide-nav nav a{font-size:16px}}
@media(max-width:768px){.nav nav{grid-template-columns:minmax(0,1fr)}.nav a{font-size:17px}.guide-nav nav a,.guide-nav-back a{font-size:17px}.nav small{font-size:16px}}

/* Balanced resource cards: equal outer height, spaced content inside Chrome. */
#google .two{align-items:stretch}
#google .mini:first-child{display:flex;flex-direction:column;align-items:flex-start;padding-top:28px;padding-bottom:28px}
#google .mini:first-child h3{margin-bottom:20px}
#google .mini:first-child .btn{margin-top:24px;margin-bottom:22px}
#google .mini:first-child p.small{margin-top:auto!important;padding-top:0}
@media(max-width:480px){#google .mini:first-child{padding-top:23px;padding-bottom:23px}#google .mini:first-child h3{margin-bottom:15px}#google .mini:first-child .btn{margin-top:18px;margin-bottom:18px}}


/* Static background ornaments derived from the existing yellow/purple identity. */
body{isolation:isolate}
body::before,body::after{content:"";position:fixed;inset:0;pointer-events:none;z-index:-1}
body::before{background-image:radial-gradient(circle,var(--decor-dot) 1px,transparent 1.5px);background-size:24px 24px;mask-image:linear-gradient(to right,black,transparent 23%,transparent 77%,black);-webkit-mask-image:linear-gradient(to right,black,transparent 23%,transparent 77%,black)}
body::after{background-image:radial-gradient(circle at -20px 27%,transparent 108px,var(--decor-purple) 109px,var(--decor-purple) 112px,transparent 113px),radial-gradient(circle at calc(100% + 30px) 73%,transparent 143px,var(--decor-yellow) 144px,var(--decor-yellow) 151px,transparent 152px),radial-gradient(circle at calc(100% + 30px) 73%,transparent 166px,var(--decor-purple) 167px,var(--decor-purple) 169px,transparent 170px),linear-gradient(135deg,transparent 44%,var(--decor-yellow) 45%,var(--decor-yellow) 48%,transparent 49%);background-size:100% 100%,100% 100%,100% 100%,70px 70px;background-position:center,center,center,30px calc(100% - 55px);background-repeat:no-repeat}
@media(max-width:768px){body::before{opacity:.5;mask-image:linear-gradient(to right,black,transparent 12%,transparent 88%,black);-webkit-mask-image:linear-gradient(to right,black,transparent 12%,transparent 88%,black)}body::after{opacity:.45;background-size:100% 100%,100% 100%,100% 100%,40px 40px;background-position:center,center,center,8px calc(100% - 25px)}}
@media print{body::before,body::after{display:none}}
@media(prefers-contrast:more){body::before,body::after{display:none}}

/* Motion layer: heading arrival, quiet background drift, and direct interaction feedback. */
.motion-toggle{font-family:var(--font);font-size:12px;min-height:44px;padding:7px 11px;border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--muted);cursor:pointer;white-space:nowrap}
.motion-toggle:hover{background:var(--yellow-soft);color:var(--ink)}.motion-toggle:disabled{cursor:default}
@keyframes heading-arrive{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}
@keyframes panel-arrive{from{opacity:0;transform:translateX(15px)}to{opacity:1;transform:translateX(0)}}
@keyframes ornament-drift{0%,100%{transform:translateY(0) rotate(0)}50%{transform:translateY(-14px) rotate(.6deg)}}
@keyframes dialog-arrive{from{opacity:0;transform:translateY(10px) scale(.985)}to{opacity:1;transform:translateY(0) scale(1)}}
@media(prefers-reduced-motion:no-preference){
 html[data-motion="on"] .welcome>div:first-child,html[data-motion="on"] .hero-in>div:last-child,html[data-motion="on"] .category-heading{animation:heading-arrive .65s cubic-bezier(.2,.75,.25,1) both}
 html[data-motion="on"] .learning-map{animation:panel-arrive .7s cubic-bezier(.2,.75,.25,1) .1s both}
 html[data-motion="on"] body::after{animation:ornament-drift 18s ease-in-out infinite}
 html[data-motion="on"] .image-dialog[open]{animation:dialog-arrive .22s ease-out both}
 html[data-motion="on"] .btn,html[data-motion="on"] .topic-tile,html[data-motion="on"] .category-tile,html[data-motion="on"] .guide-pagination a,html[data-motion="on"] .nav a,html[data-motion="on"] .brand-avatar{transition:transform .22s cubic-bezier(.2,.75,.25,1),background-color .18s,border-color .18s}
 html[data-motion="on"] .btn:active{transform:translateY(2px) scale(.98)}
 html[data-motion="on"] .topic-tile:active,html[data-motion="on"] .category-tile:active{transform:scale(.99)}
}
@media(prefers-reduced-motion:no-preference) and (hover:hover) and (pointer:fine){
 html[data-motion="on"] a.topic-tile:hover,html[data-motion="on"] .category-tile:hover{transform:translateY(-4px)}
 html[data-motion="on"] .guide-pagination a:hover,html[data-motion="on"] .btn:hover{transform:translateY(-2px)}
 html[data-motion="on"] .btn:active{transform:translateY(1px) scale(.98)}
 html[data-motion="on"] .nav a:hover{transform:translateX(3px)}
 html[data-motion="on"] .brand:hover .brand-avatar{transform:rotate(-5deg)}
}
html[data-page-hidden="true"] body::after{animation-play-state:paused!important}
html[data-motion="off"] *,html[data-motion="off"] *::before,html[data-motion="off"] *::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}
html[data-motion="off"]{scroll-behavior:auto}
@media(max-width:480px){.motion-toggle{font-size:11px;padding:7px 8px}.header-nav{gap:9px}}
@media print{.motion-toggle{display:none}*,*::before,*::after{animation:none!important;transition:none!important}}
/* Public copy cleanup: retain established layout, emphasize useful content. */
.brand>span{display:block;line-height:1.4}.footer{padding-block:26px}.footer-bottom{min-height:0}.course-entry{font-size:16px;min-height:46px}.course-description .course-entry{align-self:flex-start;margin-top:20px}.topic-tile .course-entry{align-self:flex-start}.topic-tile.pending{justify-content:center;gap:16px;min-height:190px}.pending-label{font-size:14px}.collection-header{margin-bottom:24px}.home-main{padding-bottom:48px}.version-note{font-size:14px;color:var(--muted);margin:24px 0}.source-disclosure{margin:24px 0;border-top:1px solid var(--line);padding-top:16px;color:var(--muted);font-size:15px;line-height:1.9}.source-disclosure summary{cursor:pointer;min-height:44px;display:list-item}.source-disclosure .study-source-note{font-size:15px;line-height:1.9}.source-disclosure .study-two{margin-top:12px}.study-section>.prompt-actions+.study-two{margin-top:20px}.study-finished figcaption{font-size:13px}.category-open{font-size:15px}.course-cover{justify-content:center}.study-hero .study-intro{margin-top:12px}
.footer-bottom{flex-wrap:wrap}

/* Google preparation cards: match the adjacent resource-card icon spacing. */
#google .two > .mini > h3{display:flex;align-items:center;gap:14px;min-height:46px}
#google .two > .mini > h3::before{content:"";display:block;flex:0 0 46px;width:46px;height:46px;background:url("../images/icons/chrome-92.png") center/contain no-repeat}
@media(max-width:480px){
 #google .two > .mini > h3{min-height:38px}
 #google .two > .mini > h3::before{flex-basis:38px;width:38px;height:38px}
}

#google .two > .mini{padding-top:23px}
@media(max-width:480px){#google .two > .mini{padding-top:19px}}

/* Shared masthead: compact identity and a grouped, clearly selected navigation. */
.site-header{border-bottom:1px solid var(--line);box-shadow:0 3px 16px rgba(50,30,87,.035)}
.site-header .header-inner.wrap{width:min(1240px,calc(100% - 64px));margin-inline:auto;gap:24px}
.site-header .brand{gap:12px;font-size:18px;letter-spacing:.01em;min-height:48px}
.site-header .brand-avatar{width:44px;height:44px;border-radius:13px;box-shadow:0 2px 0 rgba(61,43,21,.08)}
.site-header .header-nav{gap:4px;padding:4px;border:1px solid var(--line);border-radius:14px;background:var(--bg);font-size:15px}
.site-header .header-nav a{justify-content:center;min-height:40px;padding:0 22px;border:0;border-radius:10px;font-weight:500;line-height:1.4;transition:background .18s,color .18s}
.site-header .header-nav a[aria-current=page]{border:0;background:var(--yellow);color:var(--ink);font-weight:700;box-shadow:0 1px 3px rgba(61,43,21,.08)}
.site-header .header-nav a:hover{background:var(--soft);color:var(--action);text-decoration:none}
.site-header .header-nav a[aria-current=page]:hover{background:var(--yellow-hover);color:var(--ink)}
.site-header a:focus-visible{outline:2px solid var(--action);outline-offset:4px}
@media(max-width:600px){
 .site-header .header-inner.wrap{width:calc(100% - 32px);gap:10px}
 .site-header .brand{gap:8px;font-size:15px}
 .site-header .brand-avatar{width:36px;height:36px;border-radius:11px}
 .site-header .header-nav{padding:3px;gap:2px;border-radius:12px;font-size:13px}
 .site-header .header-nav a,.site-header .header-nav a.optional{display:flex;min-height:38px;padding:0 12px;border-radius:8px}
}
@media(max-width:359px){
 .site-header .header-inner.wrap{width:calc(100% - 24px);gap:6px}
 .site-header .brand{font-size:13px;gap:6px}
 .site-header .brand-avatar{width:32px;height:32px}
 .site-header .header-nav{font-size:12px}
 .site-header .header-nav a,.site-header .header-nav a.optional{padding:0 8px}
}
@media(prefers-reduced-motion:reduce){.site-header .header-nav a{transition:none}}

/* Keep navigation beside the identity instead of at the far edge. */
.site-header .header-inner.wrap{justify-content:flex-start;gap:24px}
.site-header .brand{padding-right:24px;border-right:1px solid var(--line)}
.site-header .header-nav{margin:0}
.site-header .header-nav a[aria-current=location]{background:var(--yellow);color:var(--ink);font-weight:700}
#cases,#courses{scroll-margin-top:calc(var(--nav-h) + 20px)}
@media(max-width:600px){
 :root{--nav-h:112px}
 .site-header .header-inner.wrap{align-content:center;flex-wrap:wrap;gap:7px}
 .site-header .brand{width:100%;padding-right:0;border-right:0;min-height:36px}
 .site-header .header-nav{width:100%;padding:2px}
 .site-header .header-nav a{flex:1;min-height:34px;padding:0 10px}
}

/* Course modules: pointer depth, chapter feedback, and replayable entrances. */
main .module-motion {isolation:isolate;transition:border-color .22s,box-shadow .25s,transform .28s cubic-bezier(.2,.75,.2,1);transform-origin:center;}
main a.module-motion:focus-visible,main .chapter-links a:focus-visible {outline:3px solid var(--action);outline-offset:4px;}
main .module-motion:focus-within {border-color:var(--action);}
main .chapter-links a {border-radius:7px;transition:background-color .18s,padding .2s;}
main .chapter-arrow {transition:transform .2s;}
main .course-cover {overflow:hidden;}
main .course-cover .cover-number {transition:transform .35s cubic-bezier(.2,.75,.2,1);}
main .module-motion .course-entry {transition:box-shadow .2s,background-color .2s;}
@media(hover:hover) and (pointer:fine) and (prefers-reduced-motion:no-preference) {
 html[data-motion="on"] main .module-motion.is-pointer-engaged:not(.featured-course):not(.workflow-map) {
  transform:perspective(1100px) rotateX(var(--card-rx,0deg)) rotateY(var(--card-ry,0deg)) scale(1.012)!important;
  border-color:var(--action);box-shadow:0 14px 30px -18px rgba(65,40,118,.40);
  background-image:radial-gradient(ellipse at var(--light-x,50%) var(--light-y,50%),rgba(255,230,64,.12),transparent 65%);
 }
 main .featured-course.is-pointer-engaged {border-color:rgba(92,53,190,.48);box-shadow:0 20px 42px -26px rgba(65,40,118,.42);}
 main .featured-course.is-pointer-engaged .cover-number {transform:translate(var(--cover-x,0),var(--cover-y,0)) rotate(-3deg);}
 main .chapter-links a:hover {background:rgba(100,60,200,.065);padding-left:9px;padding-right:9px;}
 main .chapter-links a:hover .chapter-arrow {transform:translate(2px,-2px);color:var(--action);}
 main .module-motion.is-pointer-engaged .course-entry {background-color:#ffe530;box-shadow:0 4px 0 rgba(64,47,106,.20),0 7px 16px -12px rgba(64,47,106,.5);}
 html[data-motion="on"] main a.module-motion:active {transform:scale(.995)!important;}
}
@media(prefers-reduced-motion:reduce) {
 main .module-motion,main .chapter-links a,main .chapter-arrow,main .course-cover .cover-number {transition:none!important;transform:none!important;}
}