.tzbg{--olive:#B1DC53;--olive-dark:#5B7F00;--olive-deep:#1E2609;--seaweed:#37421F;--fresh-green:#B8E175;--fresh-green-light:#EBF4D7;--ink:#2B2B2B;--night:#151615;--frost:#191A19;--leopard:#2A2D25;--dusty:#282928;--stone:#FBFAF7;--green-stone:#F6F4EA;--champagne:#F5D0A7;--champagne-light:#F9F3E3;--cassius:#E0D5C0;--cassius-light:#E7DFCF;--camo:#676155;--camo-light:#998C74;--garden-stone:#929491;--red:#BD2E22;--red-soft:#FF7467;--white:#FFFFFF;--bg:var(--stone);--bg-2:var(--green-stone);--surface:var(--white);--input-bg:var(--white);--input-border:var(--cassius);--well:var(--green-stone);--line:var(--cassius-light);--line-strong:var(--cassius);--text:var(--ink);--text-2:var(--camo);--text-3:#716A5E;--link:#527200;--mini:#527200;--focus:var(--ink);--btn:var(--ink);--btn-label:var(--white);--btn-hover:#08080B;--logo:var(--ink);--ok:#206A49;--ok-bg:rgba(92,184,104,0.16);--bad:var(--red);--bad-bg:rgba(203,100,92,0.12);--warn:#9C4710;--warn-bg:#FAE3D5;--scrim:rgba(21,22,21,0.72);--night-edge:transparent;--band:var(--night);--font-sans:"Hanken Grotesk",ui-sans-serif,system-ui,sans-serif;--font-jp:"UD Shin Go NT Pro","TT UD Shin Go NT Pro","Noto Sans JP","Hiragino Sans",sans-serif;--font-mono:"Geist Mono",ui-monospace,"SF Mono",Menlo,monospace;--fs-mega:clamp(56px,19.2px + 8.4vw,176px);--fs-display:clamp(48px,22.4px + 5vw,112px);--fs-h2:clamp(34px,22.4px + 2.6vw,64px);--fs-h3:clamp(26px,20px + 1.2vw,38px);--fs-h4:clamp(19px,17.6px + 0.35vw,23px);--fs-lede:clamp(19px,16.8px + 0.55vw,24px);--fs-body:16.5px;--fs-small:14.3px;--fs-xs:13.2px;--gutter:clamp(16px,6.4px + 3vw,64px);--block-y:clamp(64px,40px + 6vw,136px);--r-sm:8px;--r-md:14px;--r-lg:22px;--r-xl:32px;--pill:9999px;--ease-out:cubic-bezier(0.2,0,0,1);--ease-in:cubic-bezier(0.4,0,1,1);--t-fast:140ms;--t-base:240ms;--t-reveal:480ms;--sidebar-w:272px;color-scheme:light}@media (prefers-color-scheme:dark){.tzbg:not([data-theme=light]){--bg:var(--night);--bg-2:#101110;--surface:var(--frost);--input-bg:#08080B;--input-border:var(--dusty);--well:#1C1D1B;--line:var(--dusty);--line-strong:#3A3B39;--text:var(--stone);--text-2:var(--garden-stone);--text-3:#888A85;--link:var(--olive);--mini:var(--olive);--focus:var(--white);--btn:var(--stone);--btn-label:var(--night);--btn-hover:var(--white);--logo:var(--stone);--ok:#77CF7D;--ok-bg:rgba(92,184,104,0.16);--bad:var(--red-soft);--bad-bg:rgba(203,100,92,0.12);--warn:#F0955D;--warn-bg:rgba(173,87,31,0.14);--night-edge:rgba(251,250,247,0.12);--band:#08080B;color-scheme:dark}}.tzbg[data-theme=dark]{--bg:var(--night);--bg-2:#101110;--surface:var(--frost);--input-bg:#08080B;--input-border:var(--dusty);--well:#1C1D1B;--line:var(--dusty);--line-strong:#3A3B39;--text:var(--stone);--text-2:var(--garden-stone);--text-3:#888A85;--link:var(--olive);--mini:var(--olive);--focus:var(--white);--btn:var(--stone);--btn-label:var(--night);--btn-hover:var(--white);--logo:var(--stone);--ok:#77CF7D;--ok-bg:rgba(92,184,104,0.16);--bad:var(--red-soft);--bad-bg:rgba(203,100,92,0.12);--warn:#F0955D;--warn-bg:rgba(173,87,31,0.14);--night-edge:rgba(251,250,247,0.12);--band:#08080B;color-scheme:dark}.tzbg *,.tzbg :after,.tzbg :before{box-sizing:border-box}html:has(.tzbg){-webkit-text-size-adjust:100%;scroll-padding-top:calc(var(--_size---navbar, 5.5rem) + 24px)}.tzbg{margin:0;background:var(--bg);color:var(--text);--font-family:var(--font-sans);font-family:var(--font-sans);font-size:var(--fs-body);line-height:1.55;font-weight:400;font-feature-settings:"ss01" 0;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;overflow-x:clip}.tzbg img,.tzbg svg{display:block;max-width:100%}.tzbg [hidden]{display:none!important}.tzbg img{height:auto}.tzbg a{color:var(--link);text-decoration-thickness:1px;text-underline-offset:.2em}.tzbg a:hover{text-decoration-thickness:2px}.tzbg p{margin:0 0 1em;max-width:64ch}.tzbg h1,.tzbg h2,.tzbg h3,.tzbg h4{margin:0;font-weight:400;line-height:1.05;letter-spacing:-.02em;text-wrap:balance}.tzbg ol,.tzbg ul{margin:0;padding:0}.tzbg button,.tzbg input,.tzbg select{font:inherit;color:inherit}.tzbg button{cursor:pointer}.tzbg ::selection{background:var(--olive);color:var(--night)}.tzbg :focus-visible{outline:none;box-shadow:0 0 0 2px var(--bg),0 0 0 4px var(--focus);border-radius:var(--r-sm)}.tzbg .on-dark :focus-visible{box-shadow:0 0 0 2px var(--night),0 0 0 4px var(--white)}.tzbg .visually-hidden{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}.tzbg .skip-link{position:absolute;left:12px;top:-60px;z-index:1300;background:var(--btn);color:var(--btn-label);padding:10px 16px;border-radius:var(--pill);text-decoration:none;transition:top var(--t-fast) var(--ease-out)}.tzbg .skip-link:focus{top:12px}.tzbg svg.logo{fill:currentColor;overflow:visible}.tzbg .icon{width:20px;height:20px;flex:none}.tzbg .icon-16{width:16px;height:16px;flex:none}.tzbg .mono{--font-family:var(--font-mono);font-family:var(--font-mono);font-size:.92em;letter-spacing:-.01em;font-feature-settings:"tnum";font-variant-numeric:tabular-nums}.tzbg .mini{font-size:var(--fs-xs);font-weight:500;letter-spacing:.08em;text-transform:uppercase;color:var(--mini)}.tzbg .muted{color:var(--text-2)}.tzbg .small{font-size:var(--fs-small)}.tzbg .shell{display:grid;grid-template-columns:var(--sidebar-w) minmax(0,1fr);min-height:100vh}.tzbg .sidebar{position:-webkit-sticky;position:sticky;top:0;height:100vh;overflow-y:auto;overscroll-behavior:contain;display:flex;flex-direction:column;gap:20px;padding:24px 20px 20px 24px;border-right:1px solid var(--line);background:var(--bg);scrollbar-width:thin;scrollbar-color:var(--line-strong) transparent;z-index:100}.tzbg .sidebar-top{display:flex;align-items:center;justify-content:space-between;gap:12px}.tzbg .brand-link{color:var(--logo);display:inline-flex;border-radius:var(--r-sm)}.tzbg .brand-link svg{width:116px;height:auto}.tzbg .sidebar-meta{display:flex;align-items:center;gap:10px;color:var(--text-2);font-size:var(--fs-xs)}.tzbg .progress-ring{width:28px;height:28px;flex:none}.tzbg .progress-ring circle{fill:none;stroke-width:2.5}.tzbg .progress-ring .track{stroke:var(--line)}.tzbg .progress-ring .value{stroke:var(--olive-dark);stroke-linecap:round;transform:rotate(-90deg);transform-origin:50% 50%}.tzbg[data-theme=dark] .progress-ring .value{stroke:var(--olive)}@media (prefers-color-scheme:dark){.tzbg:not([data-theme=light]) .progress-ring .value{stroke:var(--olive)}}.tzbg .search-trigger{display:flex;align-items:center;gap:8px;width:100%;height:32px;padding:0 4px 0 16px;border:1px solid var(--input-border);border-radius:var(--pill);background:var(--input-bg);color:var(--text-2);font-size:var(--fs-small);transition:border-color var(--t-fast) var(--ease-out)}.tzbg .search-trigger .search-label{flex:1 1;text-align:left}.tzbg .search-trigger:hover{border-color:var(--text-3)}.tzbg .kbd{display:inline-flex;align-items:center;height:24px;padding:0 6px;border-radius:var(--pill);border:1px solid var(--input-border);background:var(--input-bg);color:var(--text-3);font-size:var(--fs-small);line-height:1}.tzbg .nav{flex:1 1}.tzbg .nav ol{list-style:none}.tzbg .nav-chapter{border-top:1px solid var(--line)}.tzbg .nav-chapter:last-child{border-bottom:1px solid var(--line)}.tzbg .nav-chapter>a{display:grid;grid-template-columns:28px 1fr;align-items:baseline;padding:10px 4px;color:var(--text);text-decoration:none;font-size:var(--fs-small);font-weight:500;border-radius:var(--r-sm)}.tzbg .nav-chapter>a .num{--font-family:var(--font-mono);font-family:var(--font-mono);font-size:11px;color:var(--text-3);font-weight:400}.tzbg .nav-chapter>a:hover{color:var(--link)}.tzbg .nav-sub{display:grid;grid-template-rows:0fr;visibility:hidden;transition:grid-template-rows var(--t-base) var(--ease-out),visibility 0s linear var(--t-base)}.tzbg .nav-sub>ol{overflow:hidden;min-height:0}.tzbg .nav-chapter.is-open .nav-sub,.tzbg .nav-chapter:focus-within .nav-sub{grid-template-rows:1fr;visibility:inherit;transition-delay:0s}.tzbg .nav a:focus-visible{box-shadow:inset 0 0 0 2px var(--focus)}.tzbg .nav-sub a{display:block;padding:5px 4px 5px 28px;color:var(--text-2);text-decoration:none;font-size:var(--fs-small);line-height:1.35;border-radius:var(--r-sm)}.tzbg .nav-sub li:last-child a{margin-bottom:10px}.tzbg .nav a.is-active,.tzbg .nav-sub a:hover{color:var(--text)}.tzbg .nav-sub a.is-active{color:var(--link);font-weight:500}.tzbg .nav-chapter.is-current>a .num{color:var(--link)}.tzbg .sidebar-foot{display:grid;grid-gap:10px;gap:10px}.tzbg .theme-toggle{display:inline-flex;align-items:center;gap:8px;padding:8px 12px 8px 10px;width:-moz-fit-content;width:fit-content;border:1px solid var(--line);border-radius:var(--pill);background:transparent;color:var(--text-2);font-size:var(--fs-small)}.tzbg .theme-toggle:hover{color:var(--text);border-color:var(--line-strong)}.tzbg .theme-toggle .when-dark{display:none}.tzbg[data-theme=dark] .theme-toggle .when-dark{display:block}.tzbg[data-theme=dark] .theme-toggle .when-light{display:none}@media (prefers-color-scheme:dark){.tzbg:not([data-theme=light]) .theme-toggle .when-dark{display:block}.tzbg:not([data-theme=light]) .theme-toggle .when-light{display:none}}.tzbg .main{min-width:0;overflow-x:clip}.tzbg .mobile-bar{display:none}@media (max-width:1099px){.tzbg .shell{grid-template-columns:minmax(0,1fr)}.tzbg .sidebar{position:fixed;inset:0 auto 0 0;width:min(88vw,340px);height:100dvh;transform:translateX(-102%);visibility:hidden;transition:transform var(--t-base) var(--ease-out),visibility 0s linear var(--t-base);z-index:1200}.tzbg .sidebar.is-open{transform:translateX(0);visibility:visible;transition:transform var(--t-base) var(--ease-out),visibility 0s}.tzbg .nav-scrim{position:fixed;inset:0;z-index:1150;background:var(--scrim)}.tzbg .mobile-bar{display:flex;align-items:center;justify-content:space-between;gap:12px;position:-webkit-sticky;position:sticky;top:0;z-index:1000;padding:10px 16px;background:color-mix(in srgb,var(--bg) 92%,transparent);backdrop-filter:saturate(1.2) blur(10px);-webkit-backdrop-filter:saturate(1.2) blur(10px);border-bottom:1px solid var(--line)}.tzbg .mobile-bar .brand-link svg{width:96px}.tzbg .mobile-bar-current{flex:1 1;min-width:0;font-size:var(--fs-small);color:var(--text-2);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;text-align:right}.tzbg .sidebar .sidebar-close{display:inline-flex!important}.tzbg .sidebar .sidebar-meta{display:none}html:has(.tzbg){scroll-padding-top:calc(var(--_size---navbar, 5.5rem) + 72px)}}.tzbg .icon-btn{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:var(--pill);border:1px solid var(--line);background:var(--surface);color:var(--text)}.tzbg .icon-btn:hover{border-color:var(--line-strong)}.tzbg .sidebar-close{display:none!important}.tzbg .btn{--_bg:var(--btn);--_fg:var(--btn-label);--_bd:var(--btn);display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:0 20px;border-radius:var(--pill);border:1px solid var(--_bd);background:var(--_bg);color:var(--_fg);font-size:var(--fs-small);font-weight:500;text-decoration:none;white-space:nowrap;transition:background-color var(--t-fast) var(--ease-out),border-color var(--t-fast) var(--ease-out),color var(--t-fast) var(--ease-out)}.tzbg .btn:hover{--_bg:var(--btn-hover);--_bd:var(--btn-hover);text-decoration:none}.tzbg .btn-ghost{--_bg:transparent;--_fg:var(--text);--_bd:var(--line-strong)}.tzbg .btn-ghost:hover{--_bg:var(--bg-2);--_bd:var(--text)}.tzbg .btn-small{min-height:34px;padding:0 14px;font-size:var(--fs-xs)}.tzbg .btn-olive{--_bg:var(--olive);--_fg:var(--night);--_bd:var(--olive)}.tzbg .btn-olive:hover{--_bg:var(--fresh-green);--_bd:var(--fresh-green)}.tzbg .on-dark .btn-ghost{--_fg:var(--stone);--_bd:rgba(251,250,247,0.28)}.tzbg .on-dark .btn-ghost:hover{--_bg:rgba(251,250,247,0.08);--_bd:var(--stone)}.tzbg .tag{display:inline-flex;align-items:center;gap:6px;padding:3px 9px;border-radius:6px;font-size:var(--fs-xs);font-weight:500;line-height:1.3;white-space:nowrap}.tzbg .tag-confirm{color:var(--warn);background:var(--warn-bg)}.tzbg .tag-ok{color:var(--ok);background:var(--ok-bg)}.tzbg .tag-bad{color:var(--bad);background:var(--bad-bg)}.tzbg .tag-neutral{color:var(--text-2);background:var(--bg-2)}.tzbg .segmented{display:inline-flex;padding:3px;gap:2px;border-radius:var(--pill);background:var(--bg-2);border:1px solid var(--line)}.tzbg .segmented button{border:0;background:transparent;padding:7px 14px;border-radius:var(--pill);font-size:var(--fs-xs);font-weight:500;color:var(--text-2)}.tzbg .segmented button[aria-pressed=true]{background:var(--surface);color:var(--text);box-shadow:inset 0 0 0 1px var(--text)}.tzbg .segmented button:hover{color:var(--text)}.tzbg .range{display:grid;grid-gap:8px;gap:8px}.tzbg .range label{display:flex;justify-content:space-between;font-size:var(--fs-xs);color:var(--text-2)}.tzbg input[type=range]{-webkit-appearance:none;-moz-appearance:none;appearance:none;width:100%;height:28px;background:transparent}.tzbg input[type=range]::-webkit-slider-runnable-track{height:2px;background:var(--line-strong);border-radius:2px}.tzbg input[type=range]::-moz-range-track{height:2px;background:var(--line-strong);border-radius:2px}.tzbg input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:20px;height:20px;margin-top:-9px;border-radius:50%;background:var(--text);border:3px solid var(--bg)}.tzbg input[type=range]::-moz-range-thumb{width:16px;height:16px;border-radius:50%;background:var(--text);border:3px solid var(--bg)}.tzbg input[type=range]:focus-visible{box-shadow:none}.tzbg input[type=range]:focus-visible::-webkit-slider-thumb{box-shadow:0 0 0 2px var(--bg),0 0 0 4px var(--focus)}.tzbg input[type=range]:focus-visible::-moz-range-thumb{box-shadow:0 0 0 2px var(--bg),0 0 0 4px var(--focus)}.tzbg .chips{display:flex;flex-wrap:wrap;gap:8px}.tzbg .chip{display:inline-flex;align-items:center;gap:8px;padding:6px 12px 6px 6px;border:1px solid var(--line);border-radius:var(--pill);background:var(--surface);font-size:var(--fs-xs);font-weight:500;color:var(--text-2)}.tzbg .chip .sw{width:22px;height:22px;border-radius:50%;box-shadow:inset 0 0 0 1px rgba(0,0,0,.12);background-size:cover;background-position:50%}.tzbg .chip[aria-pressed=true]{border-color:var(--text);color:var(--text)}.tzbg .chip:hover{color:var(--text)}.tzbg .hero{position:relative;overflow:hidden;isolation:isolate;min-height:min(100vh,980px);display:grid;grid-template-rows:auto 1fr auto;padding:clamp(24px,3vw,40px) var(--gutter) clamp(28px,4vw,48px);background:var(--band);color:var(--stone)}.tzbg .hero-top{position:relative;z-index:2;display:flex;justify-content:flex-start;flex-wrap:wrap;gap:8px 32px;font-size:var(--fs-small);letter-spacing:.01em;color:rgba(251,250,247,.66)}.tzbg .hero-body{align-self:center;padding-block:clamp(48px,8vh,96px);max-width:1100px;position:relative;z-index:2}.tzbg .hero h1{font-size:var(--fs-mega);font-weight:300;line-height:.92;letter-spacing:-.045em}.tzbg .hero h1 .line{display:block}.tzbg .hero-lede{margin-top:clamp(32px,4vw,56px);padding-top:clamp(20px,2.2vw,28px);border-top:1px solid rgba(251,250,247,.4);max-width:820px}.tzbg .hero-lede p{margin:0}.tzbg .hero-lede-title{font-size:var(--fs-lede);line-height:1.3;color:var(--stone)}.tzbg .hero-lede-sub{margin-top:8px!important;font-size:var(--fs-body);line-height:1.5;color:rgba(251,250,247,.62)}.tzbg .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:clamp(28px,3vw,40px)}.tzbg 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.hero-orbit{width:150vw;right:-70vw;top:40%;color:var(--seaweed)}.tzbg .hero-top span:last-child{display:none}}.tzbg .reveal-up{opacity:0;transform:translateY(14px);animation:tzbg-revealUp var(--t-reveal) var(--ease-out) forwards}.tzbg .reveal-fade{opacity:0;animation:tzbg-revealFade var(--t-reveal) var(--ease-out) forwards}@keyframes tzbg-revealUp{to{opacity:1;transform:none}}@keyframes tzbg-revealFade{to{opacity:1}}.tzbg .chapter-intro{position:relative;overflow:hidden;isolation:isolate;min-height:clamp(420px,66vh,720px);display:flex;flex-direction:column;justify-content:flex-end;gap:20px;padding:clamp(56px,8vw,112px) var(--gutter);background:var(--band);color:var(--stone)}.tzbg .chapter-intro .chapter-num{--font-family:var(--font-mono);font-family:var(--font-mono);font-size:var(--fs-small);color:var(--olive);letter-spacing:.02em;position:relative;z-index:2}.tzbg .chapter-intro 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