@charset "UTF-8";
:root{--blue:#315cf5;--blue-dark:#2145cc;--ink:#17243d;--muted:#758096;--line:#e8ecf4;--surface:#f6f8fc;--purple:#8861d9;--green:#269c87;--orange:#df9250;--radius:18px;--shadow:0 16px 50px rgba(37,63,119,.08)}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:105px}body{margin:0;color:var(--ink);background:#fff;font-family:"Microsoft YaHei","PingFang SC","Noto Sans SC",Arial,sans-serif;font-size:15px;line-height:1.75;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:default}button{color:inherit}a,button,input,select,textarea{outline-offset:5px}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid #7e9aff}h1,h2,h3,p{margin-top:0}h1,h2,h3{line-height:1.45;letter-spacing:-.035em}h2{font-size:30px;margin-bottom:12px}h3{font-size:18px}p{margin-bottom:16px}svg{display:inline-block;flex-shrink:0;vertical-align:middle}.icon{height:22px;width:22px}.container{max-width:1240px;width:calc(100% - 96px);margin:auto}.skip-link{position:fixed;top:-100px;left:16px;background:var(--blue);color:#fff;z-index:100;padding:12px 20px}.skip-link:focus{top:8px}.site-header{height:88px;border-bottom:1px solid #edf0f7;background:rgba(255,255,255,.97);position:sticky;top:0;z-index:30;backdrop-filter:blur(18px)}.nav-wrap{height:100%;display:flex;align-items:center;gap:48px}.brand{display:inline-flex;align-items:center;gap:11px;white-space:nowrap;font-size:22px;font-weight:800;letter-spacing:-.04em;line-height:1.2}.brand-mark{display:grid;place-items:center;width:42px;height:42px;border-radius:13px;color:#fff;background:var(--blue);box-shadow:0 6px 14px #315cf520}.brand-mark .icon{width:26px;height:26px}.brand-cn{display:block;font-size:10px;letter-spacing:.23em;font-weight:500;margin-top:5px}.site-nav{display:flex;align-items:center;gap:31px;margin:auto;font-size:14px;font-weight:500}.site-nav a{position:relative;padding:31px 0}.site-nav a:hover,.site-nav a.active{color:var(--blue)}.site-nav a.active:after{content:"";position:absolute;bottom:18px;width:16px;height:3px;border-radius:3px;background:var(--blue);left:calc(50% - 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/* A local, code-native illustration of a teaching workspace. */
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.icon{width:20px;height:20px}.dots{margin-left:auto;color:#b1b9cf;letter-spacing:3px}.board-title{display:flex;align-items:center;justify-content:space-between;font-size:9px;color:#a1acc3;letter-spacing:.04em}.soft-tag{background:#eef2ff;color:#6d85d7;padding:3px 8px;border-radius:4px}.lesson-board h3{font-size:23px;margin:12px 0 6px;letter-spacing:.01em}.board-desc{font-size:10px;color:#9ca6bb;margin-bottom:18px}.board-divider{height:1px;background:#edf0f8;margin-bottom:18px}.board-task{display:flex;align-items:center;gap:10px;margin-bottom:17px}.task-check{height:22px;width:22px;border-radius:50%;display:grid;place-items:center;background:#edf8f4;color:#6ab498}.task-check .icon{height:13px;width:13px}.board-task strong{font-size:11px;font-weight:600;display:block}.board-task 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.icon{width:20px;height:20px}.purple{--tone:#8e68d5;--pale:#f1ecfc}.blue{--tone:#5b82e2;--pale:#edf3ff}.orange{--tone:#d99a5c;--pale:#fff2e6}.green{--tone:#46a18e;--pale:#eaf7f1}.mini-symbol,.row-icon,.icon-tile{color:var(--tone,var(--blue));background:var(--pale,#edf2ff)}.pill-dot{width:6px;height:6px;background:#9eb99c;border-radius:50%;margin-left:8px}.bottom-pill{left:22px;bottom:5px;transform:rotate(3deg)}.art-star{position:absolute;color:#b5a0ea;font-size:40px}.star-one{top:10px;left:41px;transform:rotate(12deg)}.star-two{bottom:16px;right:0;font-size:57px;color:#a8baf2}.art-note{position:absolute;right:-17px;top:280px;display:flex;gap:10px;align-items:center;background:#eff0ff;border:1px solid #fff;border-radius:12px;box-shadow:0 8px 26px #b1a7d51a;padding:13px 17px;z-index:3;transform:rotate(7deg);font-family:Georgia,serif;color:#8a78c4;font-style:italic}.art-note span:first-child{font-size:32px}.art-note span+span{font-size:16px}.section{padding-top:78px;padding-bottom:78px}.section-head{display:flex;justify-content:space-between;align-items:flex-end;gap:20px;margin-bottom:30px}.section-head h2{margin-bottom:8px}.section-head .eyebrow{margin-bottom:9px}.section-desc{color:var(--muted);font-size:13px;margin-bottom:0}.text-link{display:inline-flex;align-items:center;gap:8px;font-size:12px;color:var(--blue);font-weight:600;white-space:nowrap}.text-link .icon{width:17px;height:17px;transition:transform .2s}.text-link:hover .icon{transform:translateX(4px)}.topic-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}.topic-card{position:relative;padding:22px 23px 25px;border:1px solid var(--line);border-radius:12px;background:#fff;transition:transform .2s,border-color .2s,box-shadow 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5px;border-radius:4px}.copy-button:hover{background:#e8edff;color:var(--blue)}.copy-button .icon{width:13px;height:13px}.prompt-result p{font-size:10px;line-height:1.95;color:#7b89a5;margin-bottom:0;max-height:190px;overflow:auto;white-space:pre-wrap;overflow-wrap:anywhere}.form-note{display:flex;align-items:center;justify-content:center;gap:5px;font-size:8px;color:#a4adbf;margin:12px 0 0;line-height:1.7}.form-note .icon{height:12px;width:12px}.resource-banner{display:flex;align-items:center;justify-content:space-between;background:linear-gradient(120deg,#f0f5ff,#f6f3ff);border:1px solid #e6eafa;padding:31px 38px;border-radius:13px;margin-bottom:76px;gap:24px}.resource-banner>div{display:flex;gap:23px;align-items:center}.banner-icon{display:grid;place-items:center;background:#fff8;border:1px solid #fff;width:58px;height:58px;border-radius:14px;color:#8292d2;flex-shrink:0}.resource-banner .eyebrow{font-size:8px;letter-spacing:.12em;margin-bottom:6px;color:#8b9abe}.resource-banner 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h1{font-size:28px;margin-top:15px;line-height:1.6}.article-header>p{font-size:12px;line-height:2}.article-header{padding-bottom:25px}.article-header .meta{font-size:10px;gap:14px}.reading-layout{grid-template-columns:1fr;gap:28px;padding-top:24px;padding-bottom:45px}.toc{position:static;border-right:0;background:#f7f9fd;padding:20px;border-radius:10px;gap:11px}.toc>a{font-size:11px}.toc>.eyebrow{margin-bottom:2px;font-size:9px}.toc>a.back-link{display:none}.reading-body>section{margin-bottom:30px;scroll-margin-top:95px}.reading-body h2{font-size:21px}.reading-body p,.reading-body li{font-size:14px;line-height:2.1}.article-action{padding:20px;gap:13px}.article-action>div{flex:1}.article-action h3{font-size:15px}.article-action p{font-size:10px}.article-action .button{margin-left:51px;font-size:11px}.reading-body .article-note{font-size:10px}.article-related h2{font-size:19px}.article-related>a{font-size:12px}.desktop-only{display:none}}
@media(max-width:370px){.container{width:calc(100% - 28px)}.nav-actions{gap:9px}.nav-actions .button{font-size:9px;gap:5px;padding:8px}.search-link{display:none}.brand{font-size:19px}.hero h1{font-size:34px}.hero-art{transform:scale(.66);margin-bottom:-153px}.hero-label{font-size:8px}.hero-buttons .button{font-size:10px;padding:10px 11px}.hero-footnote{font-size:7px}.topic-card{padding:16px 12px}.topic-card h3{font-size:12px}.topic-card p{font-size:9px}.section-head h2{font-size:22px}.section-head>.text-link{font-size:9px}.section-desc{font-size:10px}.form-row{gap:8px}.assistant-widget{padding:18px 15px}.resource-banner{padding:23px 19px}.resource-banner h2{font-size:16px}.resource-banner p:not(.eyebrow){font-size:9px}.filter-bar{padding:12px}.filter-select select{font-size:9px}.assistant-page .assistant-widget{padding:20px 15px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}
.hero-grid{grid-template-columns:minmax(0,1.1fr) minmax(0,1fr)}
.hero-grid>*,.featured-grid>*,.assistant-section>*,.assistant-page>*,.reading-layout>*{min-width:0}
@media(max-width:1180px) and (min-width:761px){.hero-grid{grid-template-columns:minmax(0,1.05fr) minmax(0,1fr)}}
@media(max-width:760px){.hero-grid{grid-template-columns:minmax(0,1fr)}}
@media print{.site-header,.site-footer,.toc,.article-action,.article-related,.toast,.skip-link{display:none}.container{width:100%;max-width:none}.reading-layout{display:block;padding:15px 0}.article-header h1{font-size:25px}.reading-body{max-width:none}.reading-body p,.reading-body li{font-size:11pt;line-height:1.8}a{color:inherit}.article-header{padding-bottom:10px}}