:root{--page:#F6F5F1;--surface:#FFFFFF;--surface-soft:#EDEFEA;--ink:#202A28;--muted:#596560;--primary:#23665D;--primary-dark:#184B44;--accent:#B27A46;--line:#D9DEDA;--footer:#1B302D;--max:1180px;--article:780px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--page);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;font-size:16px;line-height:1.75;-webkit-text-size-adjust:100%}img{max-width:100%;height:auto;display:block}a{color:var(--primary);text-decoration-thickness:1px;text-underline-offset:3px}a:hover{color:var(--primary-dark)}button,a{touch-action:manipulation}button{font:inherit}[hidden]{display:none!important}.skip-link{position:absolute;left:-9999px;top:0}.skip-link:focus{left:16px;top:8px;z-index:999;background:#fff;padding:10px 14px;border:1px solid var(--line)}
.container{width:min(var(--max),calc(100% - 64px));margin-inline:auto}.site-header{height:68px;background:var(--surface);border-bottom:1px solid var(--line);position:relative;z-index:30}.header-inner{height:100%;display:grid;grid-template-columns:minmax(180px,1fr) auto minmax(170px,1fr);align-items:center;gap:22px}.brand{display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none;min-width:0}.brand-logo{height:32px;max-width:150px;width:auto;object-fit:contain}.brand-text{display:flex;flex-direction:column;line-height:1.12;min-width:0}.brand-cn{font-weight:750;white-space:nowrap}.brand-en{font-size:10px;letter-spacing:.08em;color:var(--muted);white-space:nowrap}.main-nav{display:flex;align-items:center;gap:4px}.main-nav a,.header-actions a,.menu-toggle{min-height:44px;display:inline-flex;align-items:center;justify-content:center;border-radius:8px}.main-nav a{padding:0 10px;color:var(--ink);text-decoration:none;border-bottom:2px solid transparent}.main-nav a:hover,.main-nav a.is-current{color:var(--primary);background:var(--surface-soft);border-bottom-color:var(--primary)}.header-actions{display:flex;justify-content:flex-end;align-items:center;gap:8px}.header-actions a{padding:0 8px;text-decoration:none}.menu-toggle{padding:0 14px;border:1px solid var(--line);background:var(--surface);color:var(--ink);cursor:pointer}.menu-toggle:hover,.menu-toggle[aria-expanded="true"]{border-color:var(--primary);color:var(--primary);background:var(--surface-soft)}.mobile-toggle{display:none}.mega-wrap{position:absolute;left:0;right:0;top:68px}.mega-panel{width:min(920px,calc(100% - 48px));margin:10px auto 0;background:var(--surface);border:1px solid var(--line);border-radius:12px;box-shadow:0 14px 30px rgba(24,75,68,.12);padding:22px}.mega-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}.mega-group h2{font-size:15px;margin:0 0 9px}.mega-group a{display:block;padding:8px 0;color:var(--ink);text-decoration:none;border-top:1px solid var(--line)}.mega-group a:first-of-type{border-top:0}.mega-group small{display:block;color:var(--muted);font-size:13px;line-height:1.5}.mobile-menu{display:none;background:var(--surface);border-bottom:1px solid var(--line)}
main{min-height:60vh}.page-hero{padding:34px 0 24px}.breadcrumb{font-size:14px;color:var(--muted);margin-bottom:9px}.breadcrumb a{color:var(--muted)}h1,h2,h3{line-height:1.35;color:var(--ink);margin-top:0}h1{font-size:32px;margin-bottom:12px;letter-spacing:-.02em}h2{font-size:24px;margin-bottom:14px}h3{font-size:18px;margin-bottom:8px}.lede{max-width:820px;color:var(--muted);margin:0}.rule{border:0;border-top:1px solid var(--line);margin:24px 0 0}.section{padding:56px 0}.section.soft{background:var(--surface-soft)}.section-title-row{display:flex;justify-content:space-between;gap:18px;align-items:end;margin-bottom:24px}.eyebrow{font-size:13px;letter-spacing:.08em;color:var(--accent);font-weight:700;margin-bottom:8px}.article{max-width:var(--article);margin-inline:auto}.article p{margin:0 0 1.1em}.article ul,.article ol{padding-left:1.25em}.article li{margin:.45em 0}.article-wide{max-width:980px;margin-inline:auto}.prose-grid{display:grid;grid-template-columns:minmax(0,1.7fr) minmax(220px,.7fr);gap:32px;align-items:start}.side-note{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:18px}.side-note p:last-child{margin-bottom:0}.number-flow{counter-reset:step;display:grid;gap:20px}.flow-item{counter-increment:step;padding:22px;background:var(--surface);border:1px solid var(--line);border-radius:12px}.flow-item h2:before{content:counter(step,decimal-leading-zero) "  ";color:var(--accent);font-size:14px}.concepts{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin:22px 0}.concept{padding:16px 18px;background:var(--surface-soft);border-left:3px solid var(--primary)}.link-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:18px}.btn{display:inline-flex;min-height:44px;align-items:center;justify-content:center;padding:0 16px;border-radius:8px;background:var(--primary);color:#fff;text-decoration:none;font-weight:700}.btn:hover{background:var(--primary-dark);color:#fff}.btn.secondary{background:transparent;color:var(--primary);border:1px solid var(--primary)}.media-row{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(230px,.65fr);gap:30px;align-items:center}.media-row.reverse{grid-template-columns:minmax(230px,.65fr) minmax(0,1.35fr)}.media-frame{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:10px}.img-regular{width:auto;max-width:100%;max-height:250px;margin:auto;object-fit:contain}.img-hero{width:auto;max-width:100%;max-height:250px;margin:auto;object-fit:contain}.img-icon{width:56px;max-width:64px;height:auto;object-fit:contain}.img-mobile{width:auto;max-width:240px;max-height:340px;margin:auto;object-fit:contain}.index-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:0 28px;border-top:1px solid var(--line)}.index-item{padding:20px 0;border-bottom:1px solid var(--line)}.index-item .num{font-size:13px;color:var(--accent);font-weight:700}.index-item h3{margin:5px 0}.index-item p{color:var(--muted);margin:0;font-size:14px}.index-item a{text-decoration:none}.method-lines{display:grid;gap:0;border-top:1px solid var(--line)}.method-line{display:grid;grid-template-columns:160px 1fr auto;gap:18px;align-items:center;padding:16px 0;border-bottom:1px solid var(--line)}.method-line strong{color:var(--ink)}.bookmark-main{display:grid;grid-template-columns:1.2fr .8fr;gap:30px}.short-recs{display:grid;gap:12px}.short-rec{padding:14px 0;border-bottom:1px solid var(--line)}.archive-guide{display:grid;grid-template-columns:1fr 1fr;gap:34px}.mini-list{display:grid;gap:12px}.mini-item{padding:14px 16px;background:var(--surface);border:1px solid var(--line);border-radius:10px}.mobile-entry{display:grid;grid-template-columns:1fr minmax(180px,260px);gap:36px;align-items:center}.icon-copy{display:flex;gap:16px;align-items:flex-start}.closing-links{display:grid;grid-template-columns:1fr 1fr;gap:34px;border-top:1px solid var(--line);padding-top:24px}.closing-links a{display:block;padding:7px 0}.route{padding:22px 0;border-top:1px solid var(--line)}.route:first-child{border-top:0}.faq-list{display:grid;gap:14px}.faq-item{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:18px 20px}.faq-item h2{font-size:18px}.service-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.service-box{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:22px}.plain-sample{white-space:pre-line;background:var(--surface-soft);border-left:3px solid var(--accent);padding:16px 18px;margin:20px 0}.toc-links{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0 24px}.toc-links a{padding:7px 10px;border:1px solid var(--line);border-radius:999px;text-decoration:none;background:var(--surface)}
.home-hero{padding:46px 0 54px}.hero-layout{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(320px,.95fr);gap:40px;align-items:center}.hero-copy p{max-width:660px;color:var(--muted)}.hero-media .media-frame{padding:12px}.home-hero h1{font-size:clamp(30px,3vw,42px);max-width:650px}.band-title{display:flex;justify-content:space-between;gap:24px;align-items:flex-end;border-top:1px solid var(--line);padding-top:14px;margin-bottom:22px}.band-title p{margin:0;color:var(--muted);max-width:540px}.city-layout{display:grid;grid-template-columns:1fr 1fr;gap:28px;align-items:start}.production{display:grid;grid-template-columns:minmax(260px,.8fr) 1.2fr;gap:32px;align-items:center}.production-copy{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.production-copy p{margin:0;color:var(--muted)}
.site-footer{background:var(--footer);color:#F4F5F1;margin-top:48px;padding:44px 0 76px}.footer-grid{display:grid;grid-template-columns:1.15fr repeat(3,1fr);gap:34px}.site-footer h2{font-size:16px;color:#fff}.site-footer p{font-size:14px;color:#D8E0DD}.site-footer a{display:block;color:#F4F5F1;padding:5px 0}.footer-brand strong{display:block;margin-bottom:8px}.footer-bottom{border-top:1px solid rgba(255,255,255,.16);margin-top:30px;padding-top:18px;font-size:14px;color:#D8E0DD}.mobile-bar{display:none}
@media(max-width:1020px){.container{width:min(var(--max),calc(100% - 48px))}.header-inner{grid-template-columns:1fr auto}.main-nav{display:none}.header-actions{grid-column:2}.prose-grid{grid-template-columns:1fr}.side-note{max-width:780px}.production-copy{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr 1fr 1fr}.footer-brand{grid-column:1/-1}}
@media(max-width:800px){h1{font-size:27px}h2{font-size:21px}.section{padding:36px 0}.container{width:calc(100% - 32px)}.media-row,.media-row.reverse,.hero-layout,.city-layout,.production,.bookmark-main,.archive-guide,.mobile-entry{grid-template-columns:1fr}.media-row.reverse .media-frame{order:0}.media-row.reverse>div:last-child{order:1}.index-list{grid-template-columns:1fr}.method-line{grid-template-columns:1fr;gap:4px}.service-grid,.closing-links{grid-template-columns:1fr}.img-regular,.img-hero{max-height:190px}.img-icon{width:48px}.img-mobile{max-width:175px;max-height:260px}.home-hero{padding:34px 0 38px}.home-hero .hero-media{order:2}.production-copy{grid-template-columns:1fr}.concepts{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr 1fr}}
@media(max-width:767px){.site-header{height:60px}.header-inner{grid-template-columns:1fr auto;gap:10px}.brand-logo{height:28px;max-width:120px}.brand-en{display:none}.desktop-only{display:none!important}.mobile-toggle{display:inline-flex}.mega-wrap{display:none!important}.mobile-menu{display:block}.mobile-menu[hidden]{display:none!important}.mobile-menu-inner{padding:10px 16px 18px}.mobile-main-links{display:grid;grid-template-columns:1fr 1fr;gap:4px 10px;padding-bottom:10px;border-bottom:1px solid var(--line)}.mobile-main-links a{min-height:44px;display:flex;align-items:center;color:var(--ink);text-decoration:none}.mobile-groups{display:grid;gap:12px;padding-top:12px}.mobile-group h2{font-size:14px;margin:0 0 4px;color:var(--muted)}.mobile-group a{display:block;min-height:40px;padding:7px 0;color:var(--ink)}.page-hero{padding:25px 0 18px}.site-footer{padding-bottom:90px}.mobile-bar{display:grid;grid-template-columns:repeat(4,1fr);position:fixed;left:0;right:0;bottom:0;z-index:40;min-height:56px;padding-bottom:env(safe-area-inset-bottom);background:#fff;border-top:1px solid var(--line)}.mobile-bar a{min-height:56px;display:flex;align-items:center;justify-content:center;text-align:center;color:var(--ink);text-decoration:none;font-size:13px}.mobile-bar a.is-current{color:var(--primary);font-weight:700;background:var(--surface-soft)}body{padding-bottom:calc(56px + env(safe-area-inset-bottom))}.footer-grid{grid-template-columns:1fr}.footer-brand{grid-column:auto}}
@media(max-width:380px){.container{width:calc(100% - 32px)}.brand-cn{font-size:15px}.menu-toggle{padding:0 11px}.mobile-main-links{grid-template-columns:1fr}.section-title-row,.band-title{display:block}.band-title p{margin-top:8px}}