@property --tm-bg{syntax:'<color>';inherits:true;initial-value:#FFFFFF}@property --tm-text{syntax:'<color>';inherits:true;initial-value:#0F1720}@property --tm-mid{syntax:'<color>';inherits:true;initial-value:#52606D}@property --tm-line{syntax:'<color>';inherits:true;initial-value:#E2E4E7}@property --tm-accent{syntax:'<color>';inherits:true;initial-value:#1FCB8F}:root{--primary:#1FCB8F;--primary2:#129D6C;--primary-rgb:31,203,143;--primary2-rgb:18,157,108;--on-primary:#FFFFFF;--bg0:#FFFFFF;--bg1:#FFFFFF;--panel:#FFFFFF;--panel2:#FAFBFC;--border:rgba(15,23,32,.06);--text:#0F1720;--muted:#52606D;--faint:#6B7785;--codebg:#F5F7F8;--chipbg:#FAFBFC;--navbg:rgba(255,255,255,.92);--glow1:transparent;--glow2:transparent;--glow3:transparent;--sheen:transparent;--shadow:0 2px 6px rgba(15,23,32,.04);--shadow-soft:0 2px 6px rgba(15,23,32,.04);--content-max:1120px;--list-max:1040px;--reading-max:920px;--radius-sm:14px;--radius-md:18px;--radius-lg:28px}html[data-theme="dark"]{--bg0:#070A12;--bg1:#0A1022;--panel:rgba(255,255,255,.08);--panel2:rgba(255,255,255,.05);--border:rgba(255,255,255,.12);--text:rgba(255,255,255,.92);--muted:rgba(255,255,255,.70);--faint:rgba(255,255,255,.50);--codebg:rgba(0,0,0,.32);--chipbg:rgba(255,255,255,.06);--navbg:rgba(7,10,18,.62);--shadow:0 4px 12px rgba(0,0,0,.20);--shadow-soft:0 2px 8px rgba(0,0,0,.16);--glow1:rgba(31,203,143,.12);--glow2:rgba(18,157,108,.08);--glow3:rgba(31,203,143,.06);--sheen:rgba(255,255,255,.04)}@media (prefers-color-scheme:dark){html:not([data-theme]),html[data-theme="system"]{--bg0:#070A12;--bg1:#0A1022;--panel:rgba(255,255,255,.08);--panel2:rgba(255,255,255,.05);--border:rgba(255,255,255,.12);--text:rgba(255,255,255,.92);--muted:rgba(255,255,255,.70);--faint:rgba(255,255,255,.50);--codebg:rgba(0,0,0,.32);--chipbg:rgba(255,255,255,.06);--navbg:rgba(7,10,18,.62);--shadow:0 4px 12px rgba(0,0,0,.20);--shadow-soft:0 2px 8px rgba(0,0,0,.16);--glow1:rgba(31,203,143,.12);--glow2:rgba(18,157,108,.08);--glow3:rgba(31,203,143,.06);--sheen:rgba(255,255,255,.04)}}*{box-sizing:border-box}html,body{height:100%}html{scroll-behavior:smooth}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition-duration:0s!important;animation-duration:0s!important}}body{margin:0;font-family:'Inter',system-ui,-apple-system,'Segoe UI',Roboto,'PingFang SC','Hiragino Sans GB','Microsoft YaHei',Arial,sans-serif;color:var(--text);background:var(--bg0);overflow-x:hidden;transition:--tm-bg .4s ease,--tm-text .4s ease,--tm-mid .4s ease,--tm-line .4s ease,--tm-accent .4s ease}img{max-width:100%;display:block}a{color:inherit;text-decoration:none}main{display:block}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,[tabindex]:focus-visible{outline:2px solid rgba(var(--primary-rgb),.65);outline-offset:3px;border-radius:4px}@media (prefers-contrast:more){:root{--border:rgba(15,23,32,.25);--muted:#2a3642;--faint:#4a5568}html[data-theme="dark"]{--border:rgba(255,255,255,.35);--muted:rgba(255,255,255,.88);--faint:rgba(255,255,255,.72)}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,[tabindex]:focus-visible{outline-width:3px;outline-color:var(--text)}}.wrap{max-width:var(--page-max,var(--content-max));margin:0 auto;padding:36px 24px 0}.wrap>h1:first-child{margin:0 0 10px;font-size:clamp(34px,5vw,50px);line-height:1.04;letter-spacing:-.045em}.lead,.muted,.sub,.tips{margin:0;color:var(--muted);line-height:1.8}.lead{max-width:72ch}.meta{margin-top:18px;font-size:13px;color:var(--faint)}.card{border:1px solid var(--border);border-radius:var(--radius-md);background:var(--panel);box-shadow:var(--shadow-soft)}.card h2{margin:0 0 10px;font-size:20px;line-height:1.24}.card p{margin:0;color:var(--muted);line-height:1.78}.card p+p{margin-top:12px}section.card{margin-top:16px;padding:18px}.card ul{margin:0;padding-left:18px;display:grid;gap:8px;color:var(--muted)}ul{color:var(--muted);line-height:1.72}.artifact-preview{margin:12px 0 0;padding:14px;border:1px solid var(--border);border-radius:14px;background:var(--codebg);color:var(--text);font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier New",monospace;font-size:13px;line-height:1.65;white-space:pre-wrap;overflow-x:auto}.artifact-preview-note{margin-top:12px;color:var(--muted);font-size:14px;line-height:1.72}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:42px;padding:10px 18px;border-radius:9999px;border:1px solid var(--border);background:var(--panel);color:var(--text);font-size:14px;font-weight:600;box-shadow:var(--shadow-soft);cursor:pointer;-webkit-user-select:none;user-select:none;transition:transform .16s ease,background .16s ease,border-color .16s ease,color .16s ease,box-shadow .16s ease;white-space:nowrap}.btn:hover{transform:translateY(-1px);border-color:var(--border);background:var(--panel2)}.btn:focus-visible{outline:2px solid rgba(var(--primary-rgb),.55);outline-offset:3px}.btn.primary{border-color:transparent;background:var(--primary);color:#0F1720;font-weight:600;box-shadow:var(--shadow-soft)}.btn.primary:hover{filter:brightness(.92)}.btn.soft{background:rgba(var(--primary-rgb),.09);border-color:rgba(var(--primary-rgb),.16)}.page-kicker{display:inline-flex;align-items:center;gap:9px;padding:8px 12px;border-radius:999px;border:1px solid var(--border);background:var(--chipbg);color:var(--muted);font-size:13px;line-height:1}.page-kicker-dot{width:8px;height:8px;border-radius:999px;background:var(--primary);box-shadow:0 0 0 4px rgba(var(--primary-rgb),.12)}.page-hero{position:relative;border:1px solid var(--border);border-radius:var(--radius-lg);padding:32px clamp(20px,4vw,36px);background:var(--panel);box-shadow:var(--shadow);overflow:hidden}.page-hero>*{position:relative;z-index:1}.page-hero h1{margin:16px 0 12px;font-size:clamp(36px,5vw,56px);line-height:1.02;letter-spacing:-.05em}.page-hero p{margin:0;color:var(--muted);line-height:1.82;max-width:72ch}.page-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}.page-stats{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}.page-stat{min-width:128px;padding:11px 14px;border-radius:16px;border:1px solid var(--border);background:var(--chipbg)}.page-stat strong{display:block;font-size:16px;line-height:1.2}.page-stat span{display:block;margin-top:4px;font-size:12px;color:var(--faint)}.page-section{margin-top:20px;content-visibility:auto;contain-intrinsic-size:1px 420px}.resource-nav{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin:18px 0 4px;padding:10px;border:1px solid var(--border);border-radius:18px;background:var(--panel2)}.resource-nav-label{padding:0 6px;color:var(--faint);font-size:12px;font-weight:800;letter-spacing:.08em;text-transform:uppercase}.resource-nav a{display:inline-flex;align-items:center;min-height:36px;padding:0 12px;border:1px solid var(--border);border-radius:999px;background:var(--panel);color:var(--muted);font-size:13px;font-weight:600}.resource-nav a:hover,.resource-nav a:focus-visible{color:var(--text);border-color:rgba(var(--primary-rgb),.28);background:rgba(var(--primary-rgb),.08)}.page-section-title{margin:0 0 12px;font-size:28px;line-height:1.12;letter-spacing:-.03em}.page-grid{display:grid;gap:16px}.page-grid.cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}.page-grid.cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}.page-card{display:flex;flex-direction:column;gap:12px;min-height:100%;padding:20px;border:1px solid var(--border);border-radius:var(--radius-md);background:var(--panel);box-shadow:var(--shadow-soft)}.page-card h2,.page-card h3{margin:0;line-height:1.24}.page-card p{margin:0;color:var(--muted);line-height:1.78}.page-link{display:inline-flex;align-items:center;gap:8px;margin-top:auto;font-weight:700;color:var(--text)}.page-link::after{content:"→";opacity:.66;transition:transform .16s ease}.page-link:hover::after{transform:translateX(3px)}.page-link:focus-visible{outline:2px solid rgba(var(--primary-rgb),.55);outline-offset:3px}.card .cta .btn:first-child{background:rgba(var(--primary-rgb),.10);border-color:rgba(var(--primary-rgb),.22);font-weight:700;color:var(--text)}.theme-toggle-btn{width:44px;height:44px;border:1px solid var(--border);border-radius:999px;padding:0;background:var(--chipbg);color:var(--text);display:inline-flex;align-items:center;justify-content:center;cursor:pointer;transition:transform .15s ease,filter .15s ease,background .15s ease}.theme-toggle-btn:hover{transform:translateY(-1px);filter:brightness(1.04)}.theme-toggle-btn:active{transform:translateY(0) scale(.98)}.theme-toggle-btn:focus-visible{outline:2px solid rgba(var(--primary-rgb),.55);outline-offset:3px}.theme-toggle-btn .icon,[data-theme-icon]{width:18px;height:18px;display:inline-flex;align-items:center;justify-content:center;line-height:1}[data-theme-icon] svg{width:18px;height:18px;display:block}.nav.spec-site-header{position:sticky;top:0;z-index:80;backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);background:var(--navbg,rgba(255,255,255,.92));border-bottom:1px solid var(--border)}.nav.spec-site-header .nav-inner{display:flex;align-items:center;justify-content:space-between;max-width:var(--content-max);margin:0 auto;padding:14px 24px;gap:16px}.nav.spec-site-header .brand{display:flex;gap:10px;align-items:center;min-width:0;font-weight:800;letter-spacing:.01em}.nav.spec-site-header .logo{width:34px;height:34px;border-radius:0;background:none;box-shadow:none;border:none;flex:0 0 auto;display:flex;align-items:center;justify-content:center}.logo-bg{fill:var(--tm-accent,var(--primary));transition:fill .4s ease}.nav.spec-site-header .nav-links{display:flex;align-items:center;justify-content:center;gap:10px;color:var(--muted);font-size:14px;flex:1 1 auto;min-width:0}.nav.spec-site-header .nav-links a{display:inline-flex;align-items:center;gap:6px;padding:9px 11px;border-radius:999px;line-height:1;transition:background .16s ease,color .16s ease,transform .16s ease}.nav.spec-site-header .nav-link-text{white-space:nowrap}.nav.spec-site-header .nav-hot-badge{display:inline-flex;align-items:center;justify-content:center;height:16px;padding:0 6px;border-radius:999px;font-size:12px;line-height:1;letter-spacing:.06em;font-weight:800;text-transform:uppercase;color:#0F1720;background:linear-gradient(135deg,#ff6a00,#ff2d20);box-shadow:0 4px 10px rgba(255,82,0,.28)}.nav.spec-site-header .nav-links a:hover{background:var(--chipbg);color:var(--text);transform:translateY(-1px)}.nav.spec-site-header .nav-links a.is-active,.nav.spec-site-header .nav-links a[aria-current="page"]{background:rgba(var(--primary-rgb),.12);color:var(--text)}.nav.spec-site-header .controls{display:flex;align-items:center;gap:10px;flex:0 0 auto}.nav.spec-site-header .icon-btn{width:44px;height:44px;border:0;padding:0;border-radius:999px;background:transparent;color:var(--muted);cursor:pointer;display:inline-flex;align-items:center;justify-content:center;transition:transform .15s ease,background .15s ease,color .15s ease}.nav.spec-site-header .icon-btn:hover{background:rgba(255,255,255,.20);transform:translateY(-1px);color:var(--text)}html[data-theme="dark"] .nav.spec-site-header .icon-btn:hover{background:rgba(255,255,255,.08)}.nav.spec-site-header .icon-btn:active{transform:translateY(0) scale(.98)}.nav.spec-site-header .icon-btn:focus-visible{outline:2px solid rgba(var(--primary-rgb),.55);outline-offset:3px}.nav.spec-site-header .icon-btn .icon{width:22px;height:22px;display:inline-flex;align-items:center;justify-content:center;position:relative;font-weight:800}.nav.spec-site-header .icon-btn .icon svg{width:20px;height:20px;display:block}.nav.spec-site-header .lang-glyph{font-size:16px;line-height:1;transform:translateY(1px);display:inline-block}.nav.spec-site-header .lang-star{font-size:10px;position:absolute;right:-6px;top:-6px;opacity:.85}.nav.spec-site-header .menu-btn{display:none}.nav.spec-site-header .menu-icon svg{width:20px;height:20px;display:block}.nav.spec-site-header .nav-menu{position:fixed;inset:0;opacity:0;pointer-events:none;transition:opacity .18s ease}.nav.spec-site-header.is-menu-open .nav-menu{opacity:1;pointer-events:auto}.nav.spec-site-header .nav-menu-backdrop{position:absolute;inset:0;border:0;padding:0;background:rgba(8,11,22,.28);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px)}.nav.spec-site-header .nav-menu-panel{position:absolute;top:76px;right:16px;left:16px;max-width:390px;margin-left:auto;padding:18px;border:1px solid var(--border);border-radius:24px;background:var(--panel);box-shadow:var(--shadow);transform:translateY(-10px);transition:transform .22s ease}html[data-theme="dark"] .nav.spec-site-header .nav-menu-panel{background:linear-gradient(180deg,rgba(17,24,39,.95),rgba(10,16,34,.88))}.nav.spec-site-header.is-menu-open .nav-menu-panel{transform:translateY(0)}.nav.spec-site-header .nav-menu-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:12px}.nav.spec-site-header .nav-menu-title{font-size:13px;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:var(--faint)}.nav.spec-site-header .nav-menu-links{display:grid;gap:8px}.nav.spec-site-header .nav-menu-links a{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 16px;border-radius:18px;border:1px solid transparent;color:var(--muted);background:transparent;transition:background .16s ease,border-color .16s ease,color .16s ease}.nav.spec-site-header .nav-menu-links a:hover{background:var(--chipbg);color:var(--text)}.nav.spec-site-header .nav-menu-links a.is-active,.nav.spec-site-header .nav-menu-links a[aria-current="page"]{background:rgba(var(--primary-rgb),.12);border-color:rgba(var(--primary-rgb),.16);color:var(--text)}.nav.spec-site-header .nav-menu-links a::after{content:"→";opacity:.54}.nav.spec-site-header .nav-menu-meta{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px;padding-top:14px;border-top:1px solid var(--border)}.nav.spec-site-header .nav-menu-pill{display:inline-flex;align-items:center;gap:8px;min-height:40px;padding:0 12px;border-radius:999px;border:1px solid var(--border);background:var(--chipbg);color:var(--text);font-size:14px}body.spec-nav-open{overflow:hidden}@media (max-width:960px){.wrap{padding:28px 20px 0}.page-hero{padding:24px 20px}.page-grid.cols-2,.page-grid.cols-3{grid-template-columns:1fr}.nav.spec-site-header .nav-inner{padding:12px 16px;gap:12px}.nav.spec-site-header .brand span:last-child{max-width:140px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.nav.spec-site-header .nav-links{display:none}.nav.spec-site-header .controls{gap:8px}.nav.spec-site-header.is-menu-open .nav-inner .controls{visibility:hidden;pointer-events:none}.nav.spec-site-header .menu-btn{display:inline-flex}}@media (max-width:680px){.page-actions,.page-stats{gap:10px}.page-stat{flex:1 1 calc(50% - 10px);min-width:0}.nav.spec-site-header .nav-menu-panel{top:68px;left:12px;right:12px;padding:16px}}#spec-progress-bar{position:fixed;top:0;left:0;height:3px;width:0;z-index:10000;background:var(--primary);transition:width .08s linear;pointer-events:none;border-radius:0 2px 2px 0}#spec-back-top{position:fixed;bottom:28px;right:24px;width:42px;height:42px;border-radius:50%;border:1px solid var(--border);background:var(--panel);color:var(--text);font-size:20px;line-height:1;cursor:pointer;z-index:998;display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);opacity:0;transform:translateY(12px);transition:opacity .22s ease,transform .22s ease,background .16s ease;pointer-events:none}#spec-back-top.visible{opacity:1;transform:translateY(0);pointer-events:auto}#spec-back-top:hover{background:var(--chipbg);transform:translateY(-2px)}.spec-pre-wrap{position:relative}.spec-copy-btn{position:absolute;top:10px;right:10px;padding:4px 10px;border-radius:8px;border:1px solid var(--border);background:var(--panel2);color:var(--faint);font-size:12px;cursor:pointer;z-index:2;transition:color .16s ease,background .16s ease,border-color .16s ease;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);line-height:1.6}.spec-copy-btn:hover{color:var(--text);background:var(--chipbg)}.spec-copy-btn.copied{color:rgba(52,211,153,.9);border-color:rgba(52,211,153,.3)}.spec-reading-time{margin:6px 0 0;font-size:13px;color:var(--faint)}.spec-toc{margin-top:16px;padding:18px}.spec-toc h2{margin:0 0 12px}.spec-toc-list{margin:0;padding-left:20px;display:grid;gap:7px;color:var(--muted)}.spec-toc-list a{color:var(--muted);text-decoration:none;transition:color .16s ease;line-height:1.5}.spec-toc-list a:hover{color:var(--text)}.breadcrumb{display:flex;align-items:center;gap:6px;margin-bottom:14px;font-size:13px;color:var(--faint)}.breadcrumb a{color:var(--muted);text-decoration:none;transition:color .16s}.breadcrumb a:hover{color:var(--text)}.breadcrumb-sep{opacity:.4}.trust-box{max-width:var(--reading-max,860px);margin:18px auto 0;border:1px solid var(--border);border-radius:16px;padding:14px;background:var(--panel);box-shadow:var(--shadow-soft)}.trust-box h2{margin:0 0 8px;font-size:20px}.trust-box ul{margin:10px 0 0;padding-left:18px;display:grid;gap:8px;color:var(--muted)}.trust-box a{color:var(--text);text-decoration:underline;text-decoration-color:rgba(var(--primary-rgb),.45)}.trust-box p{color:var(--muted);font-size:.9rem;line-height:1.6}.skip-to-content{position:absolute;left:-9999px;top:auto;width:1px;height:1px;overflow:hidden;z-index:9999;padding:.75rem 1.5rem;background:var(--primary);color:#fff;font-size:.875rem;font-weight:600;border-radius:0 0 8px 0;text-decoration:none}.skip-to-content:focus{position:fixed;left:0;top:0;width:auto;height:auto;overflow:visible}@media (max-width:720px){.resource-nav{position:sticky;top:64px;z-index:20;flex-wrap:nowrap;overflow-x:auto;margin-left:-4px;margin-right:-4px;padding:8px;border-radius:14px;scrollbar-width:none;-webkit-overflow-scrolling:touch}.resource-nav::-webkit-scrollbar{display:none}.resource-nav-label,.resource-nav a{flex:0 0 auto}}@media print{body{background:white!important;color:#111!important;font-size:12pt;line-height:1.6}.nav.spec-site-header,#spec-progress-bar,#spec-back-top,.spec-site-footer,.tag-filters,.blog-toolbar,.blog-feature-grid,.page-actions,.share-bar,.btn,.theme-toggle-btn,.menu-btn,.controls,.newsletter-card,[aria-label="Social share"]{display:none!important}.wrap{max-width:100%!important;padding:0!important;margin:0!important}a{color:#111!important;text-decoration:underline}a[href^="http"]::after{content:" (" attr(href) ")";font-size:9pt;color:#666;word-break:break-all}a[href^="/"]::after{content:" (https://spec-coding.dev" attr(href) ")";font-size:9pt;color:#666}.card,.page-card,.page-hero{border:1px solid #ddd!important;box-shadow:none!important;background:white!important;break-inside:avoid}pre,code{background:#f5f5f5!important;border:1px solid #ddd;font-size:10pt}pre{white-space:pre-wrap;word-wrap:break-word;overflow:visible}img{max-width:100%;height:auto}h1,h2,h3{break-after:avoid;color:#111!important}.breadcrumb{font-size:10pt;color:#666!important}.breadcrumb a::after{content:none!important}}