@charset "UTF-8";

:root{
  --purple:#7C5CFC;
  --pink:#E98FB3;
  --ink:#211D2B;
  --bg:#F8F6FB;
  --soft:#EEEAF5;
  --text:#302C38;
  --muted:#746E7D;
  --accent:#F2A33A;
  --paper:#FFFFFF;
  --line:#DCD6E6;
  --line-dark:#393144;
  --shadow:0 18px 48px rgba(33,29,43,.10);
  --radius:22px;
  --radius-sm:14px;
  --max:1240px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:"Microsoft YaHei","PingFang SC","Noto Sans CJK SC",Arial,sans-serif;font-size:16px;line-height:1.75}
body.no-scroll{overflow:hidden}
img{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button,input{font:inherit}
button{cursor:pointer}
p{margin:0 0 1em}
h1,h2,h3{margin:0;color:var(--ink);line-height:1.22;letter-spacing:-.02em}
h1{font-size:clamp(2.2rem,5vw,4.9rem)}
h2{font-size:clamp(1.55rem,2.8vw,2.55rem)}
h3{font-size:1.16rem}
strong{color:var(--ink)}
.shell{width:min(var(--max),calc(100% - 48px));margin-inline:auto}
.section-block{padding:84px 0}
.section-block-small{padding:34px 0}
.section-soft{background:var(--soft)}
.section-dark{background:var(--ink);color:#E9E4F0}
.section-dark h1,.section-dark h2,.section-dark h3,.section-dark strong{color:#fff}
.section-dark .eyebrow{color:#F2B65F}
.eyebrow{margin:0 0 12px;color:var(--purple);font-size:.78rem;font-weight:800;letter-spacing:.14em;text-transform:uppercase}
.muted{color:var(--muted)}
.skip-link{position:fixed;left:12px;top:12px;z-index:1000;transform:translateY(-140%);background:#fff;padding:10px 16px;border-radius:8px;box-shadow:var(--shadow)}
.skip-link:focus{transform:none}
.text-link{display:inline-flex;align-items:center;gap:8px;color:#5D43D9;font-weight:700}
.text-link::after{content:"→";transition:transform .2s ease}
.text-link:hover::after{transform:translateX(4px)}
.button{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:10px 18px;border:1px solid transparent;border-radius:999px;font-weight:800}
.button-primary{background:var(--purple);color:#fff;box-shadow:0 8px 22px rgba(124,92,252,.25)}
.button-primary:hover{filter:brightness(.96)}
.button-ghost{border-color:#BEB5D2;background:transparent;color:var(--ink)}
.section-dark .button-ghost{border-color:#5A4E69;color:#fff}
.site-header{position:sticky;top:0;z-index:100;background:rgba(248,246,251,.95);backdrop-filter:blur(12px);border-bottom:1px solid rgba(220,214,230,.8)}
.header-inner{width:min(1380px,calc(100% - 36px));margin:auto;min-height:78px;display:flex;align-items:center;gap:20px}
.brand{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.brand img{width:46px;height:46px;object-fit:contain;border-radius:12px}
.brand span{display:flex;flex-direction:column;line-height:1.15}
.brand strong{font-size:1.05rem}
.brand small{margin-top:4px;color:var(--muted);font-size:.72rem}
.primary-nav{display:flex;align-items:center;gap:3px;margin-left:auto}
.primary-nav a{padding:9px 11px;border-radius:10px;color:#4A4452;font-size:.9rem;font-weight:700}
.primary-nav a:hover,.primary-nav a.is-active{background:#E8E2F5;color:#5438D2}
.search-trigger,.nav-toggle{border:0;border-radius:999px;background:var(--ink);color:#fff;padding:10px 14px;font-weight:800}
.nav-toggle{display:none}
.search-modal[hidden]{display:none!important}
.search-modal{position:fixed;inset:0;z-index:300;display:grid;place-items:start center;padding:12vh 20px 20px}
.search-modal__backdrop{position:absolute;inset:0;background:rgba(22,18,29,.72)}
.search-modal__panel{position:relative;width:min(650px,100%);background:#fff;border-radius:24px;padding:34px;box-shadow:0 28px 90px rgba(0,0,0,.28)}
.search-modal__close{position:absolute;right:18px;top:14px;border:0;background:transparent;font-size:2rem;line-height:1;color:var(--muted)}
.search-modal__panel h2{margin-bottom:10px}
.search-modal__panel p{color:var(--muted)}
.search-form label,.inline-search label,.search-page-form label{display:block;font-weight:800;margin-bottom:8px}
.search-form div,.inline-search div,.search-page-form div{display:flex;gap:8px}
.search-form input,.inline-search input,.search-page-form input{width:100%;min-width:0;border:1px solid #CFC7DA;border-radius:12px;padding:12px 14px;background:#FAF9FC;outline:none}
.search-form input:focus,.inline-search input:focus,.search-page-form input:focus{border-color:var(--purple);box-shadow:0 0 0 3px rgba(124,92,252,.12)}
.search-form button,.inline-search button,.search-page-form button{border:0;border-radius:12px;background:var(--purple);color:#fff;padding:11px 18px;font-weight:800}
.breadcrumbs{width:min(var(--max),calc(100% - 48px));margin:24px auto 0;color:var(--muted);font-size:.84rem}
.breadcrumbs ol{display:flex;gap:7px;flex-wrap:wrap;list-style:none;margin:0;padding:0}
.breadcrumbs li:not(:last-child)::after{content:"/";margin-left:7px;color:#B0A7BA}
.breadcrumbs a:hover{color:var(--purple)}
.page-intro{padding-top:64px;padding-bottom:44px}
.page-intro>p:not(.eyebrow){max-width:860px;color:#5E5867;font-size:1.06rem}
.page-intro h1{max-width:1000px;margin-bottom:22px}
.compact-intro{padding-bottom:20px}
.intro-meta{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px}
.intro-meta span{padding:6px 11px;border-radius:999px;background:#EDE8F6;color:#655E6F;font-size:.8rem}
.visual-intro{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(280px,.65fr);gap:56px;align-items:center}
.visual-intro.reverse{grid-template-columns:minmax(280px,.65fr) minmax(0,1.1fr)}
.visual-intro.reverse>div{order:2}
.visual-intro figure{margin:0}
.visual-intro img{width:100%;aspect-ratio:16/10;object-fit:cover;border-radius:var(--radius);box-shadow:var(--shadow)}
.lead-stage{display:grid;grid-template-columns:minmax(0,1.08fr) minmax(330px,.92fr);gap:58px;align-items:center;padding-top:58px;padding-bottom:64px}
.lead-copy .lead{max-width:760px;color:#5B5564;font-size:1.08rem}
.lead-actions{display:flex;gap:18px;align-items:center;flex-wrap:wrap;margin:28px 0}
.lead-points{padding:0;margin:0;list-style:none;display:grid;gap:8px;color:#5E5867;font-size:.92rem}
.lead-points li{position:relative;padding-left:19px}
.lead-points li::before{content:"";position:absolute;left:0;top:.72em;width:7px;height:7px;border-radius:50%;background:var(--pink)}
.lead-visual{margin:0}
.lead-visual img{width:100%;aspect-ratio:4/5;object-fit:cover;border-radius:34px 12px 34px 12px;box-shadow:var(--shadow)}
.lead-visual figcaption{margin-top:12px;color:var(--muted);font-size:.84rem}
.section-heading{max-width:800px;margin-bottom:34px}
.section-heading h2{margin-bottom:14px}
.section-heading>p:last-child{color:var(--muted)}
.split-heading{max-width:none;display:grid;grid-template-columns:minmax(0,1fr) minmax(260px,.72fr);gap:42px;align-items:end}
.split-heading>p{margin:0}
.dense-stream,.catalog-list{border-top:1px solid var(--line)}
.work-row{display:grid;grid-template-columns:220px minmax(0,1fr);gap:26px;padding:26px 0;border-bottom:1px solid var(--line)}
.work-row__image img{width:100%;aspect-ratio:16/10;object-fit:cover;border-radius:14px}
.work-row__body h3{font-size:1.35rem;margin:4px 0 8px}
.work-row__body p{color:#625C69;margin-bottom:10px}
.context-note{font-size:.9rem;padding-left:13px;border-left:3px solid var(--pink)}
.section-tail{margin-top:24px}
.editorial-grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:64px}
.editorial-intro{align-self:start;position:sticky;top:120px}
.editorial-intro h2{margin-bottom:18px}
.editorial-intro p{color:var(--muted)}
.editorial-notes{display:grid;gap:12px}
.editorial-notes article{position:relative;padding:26px 28px 24px 70px;background:#fff;border-radius:18px}
.note-index{position:absolute;left:24px;top:26px;font-size:.78rem;color:var(--purple);font-weight:900}
.editorial-notes h3{margin-bottom:7px}
.editorial-notes p{margin:0;color:#686170}
.recommend-groups{display:grid;gap:28px}
.recommend-row{display:grid;grid-template-columns:310px 1fr;gap:28px;padding:28px 0;border-top:1px solid var(--line)}
.recommend-row-copy p{color:var(--muted);margin-top:8px}
.recommend-links{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.recommend-links a{padding:13px 14px;border-radius:12px;background:#fff;border:1px solid #E2DDEA;font-weight:800}
.recommend-links small{display:block;margin-top:5px;color:var(--muted);font-weight:500}
.site-map-grid{display:grid;grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr);gap:60px;align-items:start}
.site-map-grid>div p{color:#BFB5C9}
.route-list{display:grid}
.route-list a{display:grid;grid-template-columns:180px 1fr;gap:18px;padding:20px 0;border-bottom:1px solid var(--line-dark)}
.route-list strong{font-size:1.05rem}
.route-list span{color:#C6BECE}
.feature-story-grid{display:grid;grid-template-columns:minmax(300px,.85fr) minmax(0,1.15fr);gap:54px;align-items:center}
.feature-story-grid figure{margin:0}
.feature-story-grid img{width:100%;aspect-ratio:3/2;object-fit:cover;border-radius:var(--radius)}
.feature-story-grid h2{margin-bottom:18px}
.feature-story-grid p{color:#5F5966}
.feature-story-grid .button{margin-top:8px}
.topic-ledger-list{border-top:1px solid var(--line)}
.topic-ledger-list>a{display:grid;grid-template-columns:56px minmax(180px,.8fr) minmax(260px,1.4fr) 100px;gap:18px;align-items:center;padding:20px 0;border-bottom:1px solid var(--line)}
.topic-no{color:var(--purple);font-size:.78rem;font-weight:900}
.topic-ledger-list>a>span:nth-of-type(2){color:var(--muted)}
.topic-ledger-list em{font-style:normal;color:#736B7E;font-size:.8rem;text-align:right}
.secondary-grid{display:grid;grid-template-columns:1.35fr .65fr;gap:20px}
.secondary-main,.secondary-side{overflow:hidden;border-radius:24px;background:#fff;border:1px solid #E2DDEA}
.secondary-main{display:grid;grid-template-columns:.9fr 1.1fr}
.secondary-main img{width:100%;height:100%;object-fit:cover;min-height:360px}
.secondary-side img{width:100%;aspect-ratio:16/10;object-fit:cover}
.secondary-main>div,.secondary-side>div{padding:34px}
.secondary-main h2,.secondary-side h2{margin-bottom:14px}
.closing-grid{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);gap:56px;align-items:start}
.closing-links{display:grid;border-top:1px solid var(--line)}
.closing-links a{padding:16px 4px;border-bottom:1px solid var(--line);font-weight:800}
.closing-links a::after{content:"→";float:right;color:var(--purple)}
.filter-panel{border-block:1px solid var(--line);background:#fff}
.filter-grid{display:grid;grid-template-columns:.7fr 1.3fr;gap:32px}
.filter-grid strong{display:block;margin-bottom:10px}
.filter-links{display:flex;gap:7px;flex-wrap:wrap}
.filter-links a{padding:7px 10px;border-radius:999px;background:#F2EFF6;color:#5F5868;font-size:.82rem}
.filter-links a.is-current{background:var(--purple);color:#fff}
.filter-links-scroll{max-height:96px;overflow:auto;padding-right:4px}
.watch-method .method-grid{display:grid;grid-template-columns:.7fr 1.3fr;gap:50px}
.method-columns{columns:2;column-gap:34px}
.method-columns p{break-inside:avoid;color:#5F5965}
.empty-state{padding:54px;border-radius:20px;background:#fff;border:1px solid var(--line);text-align:center}
.empty-state h2{margin-bottom:12px}
.empty-actions{display:flex;justify-content:center;gap:10px;flex-wrap:wrap;margin-top:22px}
.recommend-full{padding-top:30px}
.recommend-chapter{padding:46px 0;border-top:1px solid var(--line)}
.recommend-chapter>header{display:grid;grid-template-columns:50px 1fr;gap:20px;margin-bottom:28px}
.recommend-chapter>header>span{color:var(--purple);font-weight:900}
.recommend-chapter>header p{color:var(--muted);max-width:780px;margin-top:8px}
.recommend-chapter-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:14px}
.work-card{background:#fff;border:1px solid #E2DDEA;border-radius:18px;overflow:hidden;min-width:0}
.work-card__media img{width:100%;aspect-ratio:16/10;object-fit:cover}
.work-card__body{padding:17px}
.work-card__body h3{margin:6px 0 9px}
.work-card__body p{color:#645E6B;font-size:.9rem}
.work-card__body .muted{font-size:.82rem;margin-bottom:0}
.mini-tag{display:inline-block;color:#5E45D0;background:#EEE9FF;padding:4px 8px;border-radius:999px;font-size:.7rem;font-weight:800}
.rule-grid{display:grid;grid-template-columns:.65fr 1.35fr;gap:60px}
.rule-list{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.rule-list article{padding:24px;border:1px solid #493E56;border-radius:18px}
.rule-list p{color:#BEB6C7;margin:9px 0 0}
.route-directory-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:20px}
.route-feature{position:relative;min-height:500px;overflow:hidden;border-radius:26px}
.route-feature img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.route-feature::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(33,29,43,.02),rgba(33,29,43,.8))}
.route-feature div{position:absolute;z-index:2;left:30px;right:30px;bottom:30px;color:#fff}
.route-feature div span{font-size:.76rem;font-weight:800;letter-spacing:.12em}
.route-feature h2{color:#fff;margin:8px 0}
.route-feature p{max-width:600px;margin:0;color:#EDE8F2}
.route-stack{display:grid;gap:10px}
.route-stack a{padding:22px 24px;background:#fff;border:1px solid var(--line);border-radius:18px}
.route-stack strong,.route-stack span{display:block}
.route-stack span{margin-top:7px;color:var(--muted)}
.two-column-reading{display:grid;grid-template-columns:minmax(0,.7fr) minmax(0,1.3fr);gap:60px}
.two-column-reading>div:last-child{color:#5E5866}
.search-guide-grid{display:grid;grid-template-columns:.7fr 1.3fr;gap:48px;align-items:center}
.search-guide-grid figure{margin:0}
.search-guide-grid img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:20px}
.inline-search{margin-top:24px}
.library-group{border-top:1px solid var(--line)}
.library-list{display:grid;grid-template-columns:repeat(2,1fr);gap:0 24px;border-top:1px solid var(--line)}
.library-list a{display:grid;grid-template-columns:1fr auto;gap:4px 16px;padding:18px 0;border-bottom:1px solid var(--line)}
.library-list strong{grid-column:1}
.library-list span{grid-column:1;color:var(--muted);font-size:.86rem}
.library-list em{grid-column:2;grid-row:1/3;align-self:center;font-style:normal;color:var(--purple);font-size:.8rem;font-weight:800}
.topic-index-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:#3B3346;border:1px solid #3B3346}
.topic-index-grid a{display:flex;flex-direction:column;min-height:180px;padding:24px;background:var(--ink)}
.topic-index-grid strong{font-size:1.05rem}
.topic-index-grid span{margin-top:9px;color:#BDB5C6}
.topic-index-grid em{margin-top:auto;padding-top:15px;color:#F1B45B;font-style:normal;font-size:.75rem}
.topic-index-grid.light{background:#DAD3E3;border-color:#DAD3E3}
.topic-index-grid.light a{background:#fff}
.topic-index-grid.light span{color:var(--muted)}
.topic-index-grid.light strong{color:var(--ink)}
.principles-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.principles-grid article{padding:28px;border-top:4px solid var(--purple);background:#fff}
.principles-grid span{color:var(--purple);font-weight:900;font-size:.78rem}
.principles-grid h2{font-size:1.35rem;margin:12px 0}
.principles-grid p{color:var(--muted);margin:0}
.card-grid{display:grid;gap:18px}
.card-grid-3{grid-template-columns:repeat(3,1fr)}
.axis-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.axis-grid article{padding:28px;border-left:1px solid #493F54}
.axis-grid strong{font-size:1.2rem}
.axis-grid p{color:#BDB6C6;margin:10px 0 0}
.work-article{padding-bottom:86px}
.work-hero{display:grid;grid-template-columns:1.15fr .85fr;gap:50px;align-items:center;padding-top:44px;padding-bottom:46px}
.work-deck{max-width:760px;color:#5C5663;font-size:1.08rem}
.work-hero figure{margin:0}
.work-hero figure img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:26px}
.work-facts{display:grid;gap:10px;margin:28px 0 0}
.work-facts>div{display:grid;grid-template-columns:95px 1fr;gap:15px;padding-top:10px;border-top:1px solid var(--line)}
.work-facts dt{color:var(--muted);font-size:.82rem}
.work-facts dd{margin:0}
.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:56px;align-items:start}
.article-body{max-width:800px}
.article-body section{padding:34px 0;border-top:1px solid var(--line)}
.article-body h2{font-size:1.7rem;margin-bottom:18px}
.article-body p{font-size:1.03rem;color:#4F4A55}
.article-aside{position:sticky;top:108px;display:grid;gap:10px}
.aside-box{padding:22px;background:#fff;border:1px solid var(--line);border-radius:18px}
.aside-box>p{color:var(--muted);font-size:.86rem}
.aside-box>a{display:block;padding:11px 0;border-top:1px solid var(--line);font-weight:800}
.aside-box>a span{display:block;color:var(--muted);font-size:.76rem;font-weight:500}
.aside-route{padding:12px 14px;border:1px solid var(--line);border-radius:12px;font-weight:800}
.topic-header{display:grid;grid-template-columns:1.2fr .8fr;gap:50px;align-items:center;padding-top:44px;padding-bottom:52px}
.topic-header>div>p:last-child{color:#5D5664;font-size:1.08rem;max-width:760px}
.topic-header figure{margin:0}
.topic-header img{width:100%;aspect-ratio:16/11;object-fit:cover;border-radius:24px}
.topic-reading{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:60px;padding-bottom:86px}
.topic-main{max-width:820px}
.topic-main h2{margin:42px 0 18px;font-size:1.7rem}
.topic-main p{color:#504A57}
.topic-related{position:sticky;top:108px;align-self:start;padding:24px;background:#EEEAF5;border-radius:18px}
.topic-related>strong{display:block;margin-bottom:12px}
.topic-related a{display:block;padding:12px 0;border-top:1px solid #D6D0DF;font-weight:800}
.topic-related a>span,.topic-related a>small{display:block;color:var(--muted);font-size:.75rem;font-weight:500}
.guide-step-list{list-style:none;margin:0;padding:0;border-top:1px solid var(--line)}
.guide-step-list li{display:grid;grid-template-columns:80px 1fr;gap:22px;padding:28px 0;border-bottom:1px solid var(--line)}
.guide-step-list li>span{color:var(--purple);font-weight:900}
.guide-step-list h3{font-size:1.32rem;margin-bottom:8px}
.guide-step-list p{color:var(--muted)}
.guide-step-list a{color:#5B41D8;font-weight:800}
.scenario-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.scenario-grid article{padding:30px;background:#fff;border-radius:18px}
.scenario-grid h2{font-size:1.35rem;margin-bottom:10px}
.scenario-grid p{color:var(--muted);margin:0}
.faq-stack{max-width:930px}
.faq-stack details{border-top:1px solid var(--line)}
.faq-stack details:last-child{border-bottom:1px solid var(--line)}
.faq-stack summary{list-style:none;display:grid;grid-template-columns:54px 1fr;gap:12px;align-items:center;padding:20px 4px;font-weight:900;cursor:pointer}
.faq-stack summary::-webkit-details-marker{display:none}
.faq-stack summary span{color:var(--purple);font-size:.75rem}
.faq-answer{padding:0 0 24px 70px;color:#5F5966}
.reading-narrow{max-width:850px}
.reading-narrow h2{margin:42px 0 15px;font-size:1.6rem}
.reading-narrow h2:first-child{margin-top:0}
.reading-narrow p{color:#534E59;font-size:1.02rem}
.policy-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.policy-grid article{padding:30px;background:#fff;border:1px solid var(--line);border-radius:18px}
.policy-grid h2{font-size:1.35rem;margin-bottom:10px}
.policy-grid p{color:var(--muted);margin:0}
.contact-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.contact-grid article{padding:28px;border-radius:20px;background:#fff;border:1px solid var(--line)}
.contact-grid span{color:var(--purple);font-size:.76rem;font-weight:900}
.contact-grid h2{font-size:1.28rem;margin:10px 0}
.contact-grid p{color:var(--muted);margin:0}
.search-page-form{max-width:720px;margin-top:28px}
.search-result-grid{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(260px,.5fr);gap:50px;align-items:start}
.search-result-grid aside{position:sticky;top:108px}
.search-topic-list{display:grid;border-top:1px solid var(--line)}
.search-topic-list a{padding:16px 0;border-bottom:1px solid var(--line)}
.search-topic-list strong,.search-topic-list span{display:block}
.search-topic-list span{color:var(--muted);font-size:.86rem;margin-top:5px}
.no-results{padding:20px;background:#EEEAF5;border-radius:14px;color:var(--muted)}
.error-stage{min-height:65vh;display:grid;grid-template-columns:.55fr 1.45fr;gap:56px;align-items:center;padding-block:80px}
.error-code{font-size:clamp(6rem,14vw,12rem);font-weight:900;line-height:.8;color:#DAD1F7;letter-spacing:-.08em}
.error-stage p:not(.eyebrow){max-width:720px;color:var(--muted)}
.error-actions{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-top:26px}
.site-footer{background:#18151F;color:#BDB5C6;padding:62px 0 22px}
.footer-grid{width:min(var(--max),calc(100% - 48px));margin:auto;display:grid;grid-template-columns:1.25fr repeat(3,1fr);gap:42px}
.footer-grid h2{font-size:1rem;color:#fff;margin-bottom:16px}
.footer-grid p{max-width:360px}
.footer-grid a{display:block;padding:4px 0;font-size:.9rem}
.footer-grid a:hover{color:#fff}
.footer-bottom{width:min(var(--max),calc(100% - 48px));margin:36px auto 0;padding-top:18px;border-top:1px solid #332D3C;display:flex;justify-content:space-between;gap:18px;font-size:.8rem}
.back-top{position:fixed;right:22px;bottom:22px;z-index:80;width:44px;height:44px;border:0;border-radius:50%;background:var(--ink);color:#fff;box-shadow:var(--shadow)}
.back-top[hidden]{display:none}

@media (max-width:1200px){
  .primary-nav a{padding-inline:8px;font-size:.84rem}
  .recommend-chapter-grid{grid-template-columns:repeat(3,1fr)}
  .topic-index-grid{grid-template-columns:repeat(2,1fr)}
  .lead-stage{gap:36px}
}
@media (max-width:1024px){
  .header-inner{min-height:70px}
  .nav-toggle{display:block;margin-left:auto}
  .primary-nav{position:absolute;top:70px;left:18px;right:18px;display:none;grid-template-columns:repeat(2,1fr);padding:12px;background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow)}
  .primary-nav.is-open{display:grid}
  .search-trigger{margin-left:0}
  .lead-stage,.visual-intro,.visual-intro.reverse,.work-hero,.topic-header{grid-template-columns:1fr}
  .visual-intro.reverse>div{order:initial}
  .lead-visual img{aspect-ratio:16/9}
  .editorial-grid,.site-map-grid,.feature-story-grid,.route-directory-grid,.article-layout,.topic-reading,.search-result-grid{grid-template-columns:1fr}
  .editorial-intro,.article-aside,.topic-related,.search-result-grid aside{position:static}
  .recommend-row{grid-template-columns:1fr}
  .recommend-links{grid-template-columns:repeat(3,1fr)}
  .secondary-grid{grid-template-columns:1fr}
  .secondary-main{grid-template-columns:.8fr 1.2fr}
  .rule-grid{grid-template-columns:1fr}
  .filter-grid{grid-template-columns:1fr}
  .card-grid-3{grid-template-columns:repeat(2,1fr)}
  .axis-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:820px){
  .shell,.breadcrumbs{width:min(100% - 32px,var(--max))}
  .section-block{padding:64px 0}
  .lead-stage{padding-top:40px}
  .split-heading,.closing-grid,.two-column-reading,.watch-method .method-grid,.search-guide-grid{grid-template-columns:1fr;gap:22px}
  .work-row{grid-template-columns:160px 1fr;gap:18px}
  .recommend-links{grid-template-columns:repeat(2,1fr)}
  .recommend-chapter-grid{grid-template-columns:repeat(2,1fr)}
  .route-list a{grid-template-columns:150px 1fr}
  .topic-ledger-list>a{grid-template-columns:44px 1fr 90px}
  .topic-ledger-list>a>span:nth-of-type(2){grid-column:2/4}
  .method-columns{columns:1}
  .principles-grid,.contact-grid{grid-template-columns:1fr}
  .policy-grid{grid-template-columns:1fr}
  .footer-grid{gap:28px}
}
@media (max-width:600px){
  body{font-size:15px}
  .shell,.breadcrumbs{width:calc(100% - 26px)}
  .header-inner{width:calc(100% - 22px);gap:8px}
  .brand small{display:none}
  .brand img{width:40px;height:40px}
  .search-trigger{font-size:0;width:42px;height:42px;padding:0}
  .search-trigger::before{content:"⌕";font-size:1.25rem}
  .primary-nav{left:11px;right:11px}
  .lead-stage{padding-bottom:48px}
  .lead-actions{align-items:stretch;flex-direction:column}
  .lead-actions .button{width:100%}
  .work-row{grid-template-columns:1fr}
  .work-row__image img{aspect-ratio:16/8}
  .recommend-links,.recommend-chapter-grid,.library-list,.topic-index-grid,.card-grid-3,.axis-grid,.scenario-grid,.footer-grid{grid-template-columns:1fr}
  .secondary-main{grid-template-columns:1fr}
  .secondary-main img{min-height:0;aspect-ratio:16/10}
  .route-list a{grid-template-columns:1fr;gap:5px}
  .route-feature{min-height:420px}
  .topic-ledger-list>a{grid-template-columns:34px 1fr}
  .topic-ledger-list>a>span:nth-of-type(2),.topic-ledger-list em{grid-column:2;text-align:left}
  .guide-step-list li{grid-template-columns:48px 1fr}
  .faq-stack summary{grid-template-columns:40px 1fr}
  .faq-answer{padding-left:52px}
  .search-form div,.inline-search div,.search-page-form div{flex-direction:column}
  .search-form button,.inline-search button,.search-page-form button{min-height:44px}
  .footer-bottom{width:calc(100% - 26px);flex-direction:column}
  .search-modal__panel{padding:30px 20px 22px}
  .work-facts>div{grid-template-columns:80px 1fr}
  .error-stage{grid-template-columns:1fr;gap:30px;padding-block:60px}
  .error-code{font-size:7rem}
}
@media (max-width:390px){
  .header-inner{min-height:64px}
  .primary-nav{top:64px;grid-template-columns:1fr}
  .nav-toggle{padding:9px 11px}
  .brand strong{font-size:.95rem}
  .section-block{padding:52px 0}
  h1{font-size:2.15rem}
  .page-intro{padding-top:46px}
  .button{width:100%}
  .error-actions{align-items:stretch;flex-direction:column}
}

.notes-group{display:grid;grid-template-columns:250px minmax(0,1fr);gap:42px;padding:38px 0;border-top:1px solid var(--line)}
.notes-group header p:last-child{color:var(--muted);font-size:.9rem}
.notes-list{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
.notes-list a{display:flex;flex-direction:column;min-height:170px;padding:20px;background:#fff;border:1px solid var(--line);border-radius:16px}
.notes-list strong{font-size:1rem}
.notes-list span{margin-top:7px;color:var(--muted);font-size:.86rem}
.notes-list em{margin-top:auto;padding-top:12px;color:var(--purple);font-size:.75rem;font-style:normal;font-weight:800}
.note-article{padding-bottom:80px}
.note-header{display:grid;grid-template-columns:1.15fr .85fr;gap:52px;align-items:center;padding-top:46px;padding-bottom:52px}
.note-header>div>p:last-child{max-width:790px;color:#5D5764;font-size:1.07rem}
.note-header figure{margin:0}
.note-header img{width:100%;aspect-ratio:16/10;object-fit:cover;border-radius:24px}
.note-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:56px;align-items:start}
.note-body{max-width:820px}
.note-body section{padding:32px 0;border-top:1px solid var(--line)}
.note-body h2{font-size:1.65rem;margin-bottom:17px}
.note-body p{color:#504A57;font-size:1.02rem}
.note-aside{position:sticky;top:108px;padding:22px;background:var(--soft);border-radius:18px}
.note-aside>p{color:var(--muted);font-size:.84rem}
.note-aside a{display:block;padding:12px 0;border-top:1px solid #D6CFDF;font-weight:800}
.note-aside a span{display:block;color:var(--muted);font-size:.76rem;font-weight:500}
.note-pager{display:grid;grid-template-columns:1fr 1fr;gap:20px;padding-top:32px;border-top:1px solid var(--line)}
.note-pager a{padding:16px 18px;background:#fff;border:1px solid var(--line);border-radius:14px}
.note-pager a:last-child{text-align:right}
.note-pager span{display:block;color:var(--muted);font-size:.75rem}
.note-pager strong{display:block;margin-top:5px}
@media(max-width:1024px){
  .note-header,.note-layout{grid-template-columns:1fr}
  .note-aside{position:static}
}
@media(max-width:820px){
  .notes-group{grid-template-columns:1fr;gap:18px}
  .notes-list{grid-template-columns:1fr}
}
@media(max-width:600px){
  .note-pager{grid-template-columns:1fr}
  .note-pager a:last-child{text-align:left}
}

.search-note-heading{margin-top:38px}