:root{color-scheme:light dark;--toc-w: 272px;--bg-0: oklch(97% .012 95);--bg-card: oklch(98.5% .01 95);--bg-lift: oklch(99% .008 95);--bg-inset: oklch(94.5% .014 95);--bg-band-pear: oklch(95.5% .022 95);--bg-band-cyan: oklch(95% .018 235);--bg-band-coral: oklch(95% .02 18);--fg-0: oklch(20% .012 250);--fg-1: oklch(20% .012 250 / .72);--fg-2: oklch(20% .012 250 / .52);--accent: oklch(86% .18 95);--accent-deep: oklch(76% .2 95);--accent-cyan: oklch(66% .18 235);--accent-coral: oklch(68% .24 18);--on-accent: oklch(20% .012 250);--hl-pear: oklch(86% .18 95 / .55);--btn-cast: oklch(76% .2 95 / .45);--focus-ring: oklch(66% .18 235 / .45);--selection-bg: oklch(66% .18 235 / .22);--selection-fg: var(--fg-0);--hairline: oklch(22% .012 60 / .1);--hairline-strong: oklch(22% .012 60 / .16);--color-paper: var(--bg-0);--color-paper-2: var(--bg-inset);--color-focus: var(--focus-ring);--bg-2: var(--bg-inset);--line: var(--hairline);--glass: oklch(99% .004 85 / .72);--nav-glass: oklch(98% .006 85 / .88);--nav-h: 64px;--sage: oklch(52% .1 150);--terracotta: var(--accent-coral);--amber: oklch(62% .12 55);--sky: var(--accent-cyan);--sage-bg: oklch(52% .1 150 / .1);--terracotta-bg: oklch(68% .24 18 / .12);--amber-bg: oklch(62% .12 55 / .1);--sky-bg: oklch(66% .18 235 / .12);--xiaohei-fill: oklch(20% .012 250);--overlay: oklch(22% .012 60 / .32);--overlay-strong: oklch(22% .012 60 / .48);--r-sm: 6px;--r-md: 12px;--r-lg: 20px;--r-xl: 24px;--r-pill: 999px;--shadow-card: 0 1px 2px oklch(20% .012 250 / .06), 0 4px 16px oklch(20% .012 250 / .04);--shadow-card-hover: 0 2px 4px oklch(20% .012 250 / .08), 0 12px 32px -8px oklch(20% .012 250 / .12);--ease-snap: cubic-bezier(.22, 1, .36, 1);--ease-out: cubic-bezier(.22, 1, .36, 1);--ease-in: cubic-bezier(.4, 0, 1, 1);--ease-in-out: cubic-bezier(.4, 0, .2, 1);--dur-fast: .12s;--dur-base: .18s;--dur-slow: .28s;--read-line: 1.78;--read-line-tight: 1.55;--read-gap: 1.15em;--content-max: 52rem;--content-max-wide: 67.5rem;--lesson-main-max: min(72rem, calc(100vw - var(--toc-w) - 2 * var(--page-gutter)));--text-display: clamp(2rem, 5vw, 3rem);--text-title: clamp(1.5rem, 3.4vw, 2rem);--text-heading: clamp(1.06rem, 2.6vw, 1.28rem);--text-subheading: clamp(1.06rem, 2.4vw, 1.19rem);--text-body: 1rem;--text-body-sm: .9375rem;--text-caption: .8125rem;--text-label: .75rem;--text-lead: 1rem;--space-2xs: .25rem;--space-xs: .5rem;--space-sm: .75rem;--space-md: 1rem;--space-lg: 1.5rem;--space-xl: 2rem;--space-2xl: 2.5rem;--space-3xl: 4rem;--space-stack-2xs: .375rem;--space-stack-xs: var(--space-xs);--space-stack-2sm: .625rem;--space-stack-12: var(--space-sm);--space-stack-sm: .875rem;--space-stack-base: var(--space-md);--space-stack-18: 1.125rem;--space-stack-20: 1.25rem;--space-stack-22: 1.375rem;--space-stack-md: var(--space-lg);--space-stack-lg: 1.75rem;--space-stack-xl: var(--space-xl);--space-section: var(--space-3xl);--space-section-y: clamp(3rem, 9vw, 4.5rem);--space-block: var(--space-lg);--space-heading-after: 1.25rem;--page-gutter: clamp(16px, 4vw, 28px);--demo-stack: var(--space-stack-sm);--demo-stage-pad: var(--space-lg);--demo-stage-gap: var(--space-stack-sm);--hit-min: 44px;--font-display: "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Noto Sans SC", sans-serif;--font-body: var(--font-display);--font-mono: "JetBrains Mono", ui-monospace, Menlo, Consolas, monospace}:root[data-theme-dark]{--bg-0: oklch(17% .008 60);--bg-card: oklch(21% .008 60);--bg-lift: oklch(24% .008 60);--bg-inset: oklch(14% .008 60);--bg-band-pear: oklch(23% .01 60);--bg-band-cyan: oklch(23% .012 60);--bg-band-coral: oklch(23% .014 45);--fg-0: oklch(96% .006 85);--fg-1: oklch(96% .006 85 / .72);--fg-2: oklch(96% .006 85 / .48);--accent: oklch(82% .16 95);--accent-deep: oklch(72% .18 95);--accent-cyan: oklch(72% .16 235);--accent-coral: oklch(72% .22 18);--on-accent: oklch(17% .008 60);--hl-pear: oklch(82% .16 95 / .42);--btn-cast: oklch(72% .18 95 / .35);--focus-ring: oklch(72% .16 235 / .5);--selection-bg: oklch(72% .16 235 / .28);--selection-fg: var(--fg-0);--hairline: oklch(96% .006 85 / .1);--hairline-strong: oklch(96% .006 85 / .16);--glass: oklch(96% .006 85 / .06);--nav-glass: oklch(17% .008 60 / .9);--sky: var(--accent-cyan);--sky-bg: oklch(72% .16 235 / .14);--terracotta-bg: oklch(72% .22 18 / .14);--xiaohei-fill: oklch(96% .006 85);--overlay: oklch(0% 0 0 / .52);--overlay-strong: oklch(0% 0 0 / .68);--shadow-card: 0 1px 2px oklch(0% 0 0 / .24), 0 4px 16px oklch(0% 0 0 / .18);--shadow-card-hover: 0 2px 4px oklch(0% 0 0 / .28), 0 8px 24px oklch(0% 0 0 / .22)}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:auto;overflow-x:clip;-webkit-text-size-adjust:100%;text-size-adjust:100%}body{font-family:var(--font-body);font-size:var(--text-body);background:var(--bg-0);color:var(--fg-0);line-height:var(--read-line);-webkit-font-smoothing:antialiased;overflow-x:clip}.nav,.nav *,.lesson-toc,.lesson-toc *,footer,footer *,.reading-progress,.reading-progress *,.immersive-bar,.immersive-bar *,.crumb,.pager,.pager *,.lesson-pager-fab,.lesson-pager-fab *,.anno-toolbar,.anno-toolbar *:not(textarea):not(input),.catalog-backdrop,.nav-backdrop,#path .lesson,.usage-flow,.usage-flow *{user-select:none;-webkit-user-select:none}button,.btn,.chip,.pill,.toc-item{user-select:none;-webkit-user-select:none}::selection{background:var(--selection-bg);color:var(--selection-fg)}::-moz-selection{background:var(--selection-bg);color:var(--selection-fg)}*{scrollbar-width:thin;scrollbar-color:var(--hairline-strong) transparent}::-webkit-scrollbar{width:9px;height:9px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--hairline-strong);border-radius:var(--r-pill)}::-webkit-scrollbar-thumb:hover{background:var(--fg-2)}.container{max-width:var(--content-max-wide);margin:0 auto;padding-left:calc(var(--page-gutter) + env(safe-area-inset-left,0px));padding-right:calc(var(--page-gutter) + env(safe-area-inset-right,0px))}.container-narrow{max-width:var(--content-max);margin:0 auto;padding-left:calc(var(--page-gutter) + env(safe-area-inset-left,0px));padding-right:calc(var(--page-gutter) + env(safe-area-inset-right,0px));padding-bottom:clamp(56px,10vw,88px);line-height:var(--read-line);letter-spacing:.01em}@media (min-width: 768px){.nav-mobile-only,html.has-lesson-sidebar .nav-catalog,html.has-lesson-sidebar .nav-lesson-current{display:none!important}}html.immersive-reading .container-narrow{max-width:var(--content-max);margin-left:auto;margin-right:auto}h1{font-size:var(--text-display);font-weight:700;line-height:1.2;letter-spacing:-.025em;font-style:normal;margin-bottom:var(--space-heading-after)}h2{font-size:var(--text-title);font-weight:700;line-height:1.3;letter-spacing:-.02em;font-style:normal;margin-bottom:calc(var(--space-heading-after) * .85)}h3{font-size:var(--text-subheading);font-weight:600;font-style:normal;margin-bottom:.65em;line-height:1.4}.subhead{font-size:clamp(1rem,2.2vw,1.0625rem);color:var(--fg-1);line-height:var(--read-line)}.footnote{font-size:var(--text-caption);color:var(--fg-2);line-height:var(--read-line-tight)}.lead{font-size:var(--text-lead);color:var(--fg-1);line-height:var(--read-line);max-width:46em}.mt-6{margin-top:var(--space-stack-2xs)!important}.mt-8{margin-top:var(--space-stack-xs)!important}.mt-10{margin-top:var(--space-stack-2sm)!important}.mt-12{margin-top:var(--space-stack-12)!important}.mt-14,.mt14,.stack-sm{margin-top:var(--space-stack-sm)!important}.mt-16{margin-top:var(--space-stack-base)!important}.mt-18{margin-top:var(--space-stack-18)!important}.mt-20{margin-top:var(--space-stack-20)!important}.mt-22,.mt16{margin-top:var(--space-stack-22)!important}.mt,.mt-24,.stack-md{margin-top:var(--space-stack-md)!important}.mt-28,.stack-lg{margin-top:var(--space-stack-lg)!important}.mt-32,.stack-xl{margin-top:var(--space-stack-xl)!important}.mb-6{margin-bottom:var(--space-stack-2xs)!important}.mb-10{margin-bottom:var(--space-stack-2sm)!important}.mb-12{margin-bottom:var(--space-stack-12)!important}.mb-14,.mb-sm{margin-bottom:var(--space-stack-sm)!important}.mb-xs{margin-bottom:var(--space-stack-xs)!important}.ml-8{margin-left:var(--space-stack-xs)!important}.text-center{text-align:center}.block{display:block}.max-w-full{max-width:100%}.self-center{align-self:center}.flex-center{display:flex;justify-content:center}.flex-center-row{display:flex;justify-content:center;align-items:center;gap:var(--space-stack-xs)}.text-body-sm{font-size:var(--text-body-sm)}.text-caption-size{font-size:var(--text-caption)}.text-body-lg{font-size:var(--text-body);line-height:1.9}.text-muted{color:var(--fg-1)}.text-fg-2{color:var(--fg-2)}.text-strong{font-weight:600;color:var(--fg-0)}.text-accent{color:var(--terracotta);font-weight:600}.card-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}.card-clip{overflow:hidden}.card-pad-compact{padding:18px 22px}.chips-center{justify-content:center}.svg-block{display:block;margin-inline:auto;max-width:100%}.source-note{margin-top:1.25rem;padding-top:.85rem;border-top:1px dashed var(--hairline);background:transparent}.source-note-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:.55rem}.source-note-item{position:relative;padding-left:.85rem;font-size:12px;line-height:1.65;color:#12171b75;letter-spacing:.01em}.source-note-item:before{content:"";position:absolute;left:0;top:.55em;width:4px;height:4px;border-radius:50%;background:#12171b38}.source-note-item a{color:#009edbc7;color:oklch(66% .18 235 / .78);font-weight:450;text-decoration:none;border-bottom:1px solid oklch(66% .18 235 / .18);transition:color .15s ease,border-color .15s ease;word-break:break-word}.source-note-item a:hover{color:var(--sky);border-bottom-color:#009edb61;border-bottom-color:oklch(66% .18 235 / .38)}[data-theme-dark] .source-note-item{color:#e6e5dd7a}[data-theme-dark] .source-note-item:before{background:#e6e5dd38}[data-theme-dark] .source-note-item a{color:#00b2f6d1;color:oklch(72% .16 235 / .82);border-bottom-color:#00b2f640;border-bottom-color:oklch(72% .16 235 / .25)}.eyebrow{display:inline-flex;align-items:center;gap:8px;font-family:var(--font-mono);font-size:11px;font-weight:500;color:var(--fg-2);letter-spacing:.1em;text-transform:uppercase}.hl{background-image:linear-gradient(var(--hl-pear) 0 0);background-repeat:no-repeat;background-size:100% .4em;background-position:0 84%;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-bottom:.04em}.nav{position:sticky;top:0;z-index:50;background:var(--nav-glass);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);border-bottom:1px solid var(--hairline)}.nav-inner{position:relative;max-width:1080px;margin:0 auto;padding-left:calc(var(--page-gutter) + env(safe-area-inset-left,0px));padding-right:calc(var(--page-gutter) + env(safe-area-inset-right,0px));min-height:var(--nav-h);padding-block:10px;display:flex;align-items:center;gap:22px;min-width:0}.brand{display:flex;align-items:center;gap:10px;margin-right:auto;font-weight:700;color:var(--fg-0);text-decoration:none;flex:0 1 auto;min-width:0;transition:opacity .15s ease}.brand:hover{opacity:.88}.brand-text{display:flex;flex-direction:column;gap:2px;min-width:0;line-height:1.15}.brand-name{font-size:17px;font-weight:700;letter-spacing:-.02em;white-space:nowrap}.brand-slogan{font-size:11px;font-weight:500;color:var(--fg-2);letter-spacing:.03em;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.brand-dot{flex:none;width:34px;height:34px;border-radius:var(--r-sm);background:var(--accent);display:inline-flex;align-items:center;justify-content:center;overflow:hidden}.brand-dot .xiaohei-mark{--xiaohei-fill: var(--on-accent)}.nav-links{display:flex;flex:0 0 auto;gap:14px;align-items:center;min-width:0}.nav-links a{font-size:15px;font-weight:500;color:var(--fg-1);text-decoration:none;padding:5px 11px;border-radius:var(--r-pill);border:1px solid transparent;white-space:nowrap;transition:color .15s ease,background .15s ease,border-color .15s ease}.nav-links a:hover{color:var(--sky)}.nav-links a.nav-link--active{color:var(--fg-0);font-weight:700;background:#f5ce0038;background:oklch(86% .18 95 / .22);border-color:#d0af0161;border-color:oklch(76% .2 95 / .38)}.nav-links a.nav-link--active:hover{color:var(--fg-0)}.nav-actions{display:flex;flex:0 0 auto;align-items:center;gap:10px;min-width:0}.nav-catalog{display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:600;color:var(--fg-1);background:none;border:1px solid var(--hairline-strong);border-radius:var(--r-pill);padding:4px 12px 4px 10px;cursor:pointer;line-height:1;transition:color .15s ease,border-color .15s ease,background .15s ease,transform .14s ease}.nav-catalog:hover{color:var(--fg-0);border-color:var(--accent);background:var(--accent-bg, var(--sky-bg));transform:translateY(-1px)}.nav-catalog:active{transform:translateY(1px)}.nav-catalog[aria-expanded=true]{border-color:var(--accent);color:var(--accent);background:var(--accent-bg, var(--sky-bg))}.nav-lesson-current{display:inline-flex;align-items:center;font-size:13px;font-weight:800;font-variant-numeric:tabular-nums;letter-spacing:.01em;color:var(--on-accent);background:var(--accent);border:1px solid var(--accent-deep);border-radius:var(--r-pill);padding:5px 11px;cursor:pointer;line-height:1;box-shadow:0 2px 0 0 var(--accent-deep);transition:transform .14s ease,box-shadow .14s ease,filter .15s ease}.nav-lesson-current:hover{transform:translateY(-1px);box-shadow:0 3px 0 0 var(--accent-deep);filter:saturate(1.08)}.nav-lesson-current:active{transform:translateY(1px);box-shadow:0 0 0 0 var(--accent-deep)}.nav-lang{font-size:13px;font-weight:600;color:var(--fg-1);background:none;border:1px solid var(--hairline-strong);border-radius:var(--r-pill);padding:3px 10px;cursor:pointer;line-height:1;min-width:34px;transition:color .15s ease,border-color .15s ease,background .15s ease,transform .14s ease}.nav-lang:hover{color:var(--fg-0);border-color:var(--sky);background:var(--sky-bg);transform:translateY(-1px)}.nav-lang:active{transform:translateY(1px)}.nav-search{display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:600;color:var(--fg-1);background:none;border:1px solid var(--hairline-strong);border-radius:var(--r-pill);padding:4px 12px 4px 10px;cursor:pointer;line-height:1;transition:color .15s ease,border-color .15s ease,background .15s ease,transform .14s ease}.nav-search:hover{color:var(--fg-0);border-color:var(--sky);background:var(--sky-bg);transform:translateY(-1px)}.nav-search:active{transform:translateY(1px)}.nav-theme{display:inline-flex;align-items:center;justify-content:center;color:var(--fg-1);background:none;border:1px solid var(--hairline-strong);border-radius:var(--r-pill);padding:5px 10px;cursor:pointer;line-height:1;transition:color .15s ease,border-color .15s ease,background .15s ease,transform .14s ease}.nav-theme:hover{color:var(--fg-0);border-color:var(--sky);background:var(--sky-bg);transform:translateY(-1px)}.nav-theme:active{transform:translateY(1px)}.nav-burger{display:none;align-items:center;justify-content:center;background:none;border:none;padding:4px;margin:-4px;color:var(--fg-1);cursor:pointer;transition:color .18s ease}.nav-burger:hover{color:var(--fg-0)}@media (max-width: 420px){.nav-catalog-label{display:none}.nav-catalog{padding:4px 8px}}@media (max-width: 640px){.nav-search-label{display:none}.nav-search{padding:4px 8px}.nav-progress{display:none}}.nav-backdrop{display:none}@media (max-width: 520px){.brand-slogan{display:none}}@media (max-width: 1200px){.nav-burger{display:inline-flex}.nav-backdrop{display:block;position:fixed;inset:var(--nav-h) 0 0;z-index:40;border:none;padding:0;margin:0;background:var(--overlay);cursor:pointer;-webkit-tap-highlight-color:transparent}.nav-links{position:absolute;top:100%;left:0;right:0;z-index:41;flex-direction:column;align-items:stretch;gap:0;padding:8px calc(var(--page-gutter) + env(safe-area-inset-left,0px)) 16px;padding-right:calc(var(--page-gutter) + env(safe-area-inset-right,0px));background:var(--bg-0);border-bottom:1px solid var(--hairline);box-shadow:0 12px 32px #1f19151a;display:none}.nav-links.open{display:flex}.nav-links a{font-size:16px;padding:12px 10px;border-bottom:1px solid var(--hairline);border-radius:var(--r-sm)}.nav-links a.nav-link--active{background:#f5ce002e;background:oklch(86% .18 95 / .18);color:var(--fg-0);font-weight:700}.nav-links a:last-child{border-bottom:none}}@media (max-width: 1200px){[data-theme-dark] .nav-backdrop{background:var(--overlay-strong)}[data-theme-dark] .nav-links{box-shadow:0 12px 32px #00000059}}.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;height:50px;padding:0 26px;border-radius:var(--r-pill);font-size:16px;font-weight:600;text-decoration:none;border:0;cursor:pointer;position:relative;transition:transform .14s cubic-bezier(.2,.7,.3,1),box-shadow .14s cubic-bezier(.2,.7,.3,1),background-color .16s,border-color .16s}.btn:focus-visible{outline:3px solid var(--focus-ring);outline-offset:2px}.btn-primary{background:var(--accent);color:var(--on-accent);box-shadow:0 4px 0 0 var(--accent-deep),0 6px 12px -3px var(--btn-cast)}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 0 0 var(--accent-deep),0 12px 22px -4px var(--btn-cast)}.btn-primary:active{transform:translateY(3px);box-shadow:0 1px 0 0 var(--accent-deep),0 2px 6px -2px var(--btn-cast);transition-duration:70ms}.btn-glass{background:var(--glass);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border:1px solid var(--hairline-strong);color:var(--fg-0);box-shadow:0 2px 0 0 var(--hairline-strong)}.btn-glass:hover{border-color:var(--sky);background:var(--bg-inset);transform:translateY(-1px)}.btn-glass:active{transform:translateY(1px);box-shadow:none}@media (prefers-reduced-motion: reduce){.btn,.btn-primary:hover,.btn-primary:active,.btn-glass:hover{transform:none;transition-duration:.01ms}}.card{background:var(--bg-card);border:1px solid var(--hairline);border-radius:var(--r-lg);box-shadow:var(--shadow-card);transition:transform .22s var(--ease-snap),box-shadow .22s var(--ease-snap),border-color .22s 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.dir,.pager-link:focus-visible .dir,.pager-link:hover .pager-no,.pager-link:focus-visible .pager-no{color:var(--sky)}.pager .dir{font-size:11px;font-family:var(--font-mono);color:var(--fg-2);letter-spacing:.04em;line-height:1.3}.pager-title{display:flex;align-items:baseline;gap:.4rem;min-width:0;font-size:.88rem;line-height:1.35;font-weight:550;color:var(--fg-0)}.pager-no{flex:none;font-variant-numeric:tabular-nums;font-weight:650;color:var(--fg-2)}.pager-name{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.pager .next{text-align:right}.pager .next .pager-title{justify-content:flex-end}.pager .disabled{opacity:.5;pointer-events:none}@media (max-width: 700px){.contrast,.use-grid,.use-grid.cols-2,.use-grid.cols-4{grid-template-columns:1fr}.contrast-card,.goals,.use-card{padding:var(--space-md) var(--space-lg)}.demo-head{padding:16px 22px}.demo-stage{padding:20px 22px}.demo-side{padding:22px 24px}.lesson-illus{max-width:100%;margin-inline:auto}.pager{gap:.75rem}.lesson-footer .pager{padding:6px 10px 7px}.pager-title{font-size:.84rem}.lesson-hero .meta{width:auto}.lesson-hero{padding-top:28px;margin-bottom:1.25rem}.lsec:first-of-type{margin-top:1.5rem}.demo-body{grid-template-columns:1fr}.demo-side{border-left:none;border-top:1px solid var(--hairline)}table.match{display:block;overflow-x:auto;-webkit-overflow-scrolling:touch}}@media (min-width: 701px) and (max-width: 1024px){.demo-body{grid-template-columns:1fr}.demo-side{border-left:none;border-top:1px solid var(--hairline)}}.demo{padding:0;overflow:hidden;position:relative}.demo-workbench,.card.demo{border-color:var(--hairline);box-shadow:var(--shadow-card)}.demo-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;padding:14px 20px;border-bottom:1px solid var(--hairline);flex-wrap:wrap;background:var(--bg-card)}.demo-title-wrap{display:flex;align-items:baseline;gap:9px;min-width:0}.demo-live-dot{flex:0 0 auto;position:relative;align-self:center;width:6px;height:6px;border-radius:50%;background:var(--fg-2);box-shadow:none}.demo-live-dot.is-live{background:var(--sky);animation:demo-live-pulse 2.4s var(--ease-snap) infinite}@keyframes demo-live-pulse{0%{box-shadow:0 0 0 0 var(--hl-pear, var(--accent))}70%{box-shadow:0 0 0 7px transparent}to{box-shadow:0 0 0 0 transparent}}.demo-head .demo-title{font-size:1rem;font-weight:650;line-height:var(--read-line-tight);letter-spacing:-.005em}.demo-head .demo-hint{font-size:var(--text-caption);color:var(--fg-2)}.demo-body{display:grid;grid-template-columns:1.1fr 1fr}.demo-body.demo-body--stage-only{grid-template-columns:1fr}.demo-body.demo-body--stage-only .demo-stage{align-items:stretch;justify-content:stretch;min-height:auto;padding:var(--demo-stage-pad);gap:var(--demo-stage-gap)}.demo-body.demo-body--stage-only .code-panel{width:100%}.demo-stage{padding:var(--demo-stage-pad);display:flex;align-items:center;justify-content:center;min-height:300px;background:var(--bg-lift);box-sizing:border-box;position:relative}.demo-stage:after{content:none}.demo-stage>*{position:relative;z-index:1}.demo-stage svg,.demo-stage canvas{max-width:100%;height:auto;display:block}.demo-watermark{position:absolute;right:14px;bottom:12px;z-index:2;pointer-events:none;opacity:.16;filter:saturate(.6)}.demo-side{border-left:1px solid var(--hairline);padding:26px 28px;display:flex;flex-direction:column;line-height:var(--read-line)}.demo-side>*{margin:0}.demo-side>*+*{margin-top:var(--demo-stack)}.demo-side>h4+.period{margin-top:6px}.demo-side h4{font-size:1.0625rem;font-weight:650;display:flex;align-items:center;gap:9px;line-height:var(--read-line-tight);letter-spacing:-.005em}.demo-side h4:before{content:none}.demo-side .period{font-size:var(--text-label);color:var(--fg-2);line-height:var(--read-line-tight)}.demo-side .demo-side-badge{color:var(--sage)}.demo-side .demo-desc,.demo-side p:not(.footnote){font-size:var(--text-body);color:var(--fg-1);text-autospace:ideograph-alpha ideograph-numeric;hanging-punctuation:allow-end;line-height:var(--read-line);letter-spacing:.01em;word-break:break-word;overflow-wrap:break-word}.demo-side .demo-desc .ln,.demo-side p:not(.footnote) .ln{font-size:.78em;color:var(--fg-2);font-variant-numeric:tabular-nums;letter-spacing:0;white-space:nowrap}.demo-side .tags{display:flex;gap:8px;flex-wrap:wrap}.demo-head-actions{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-left:auto}.demo-fs-btn{font-family:inherit;font-size:12px;font-weight:600;padding:6px 12px;border-radius:var(--r-pill);cursor:pointer;color:var(--fg-1);background:var(--glass);border:1px solid var(--hairline-strong);transition:none}.demo-fs-btn:hover{border-color:var(--sky)}.demo-code-btn.is-on{border-color:var(--sky);color:var(--fg-0);background:var(--sky-bg)}.demo-code{border-top:1px solid var(--hairline);background:var(--bg-card)}.demo-code .code-panel{border:none;border-radius:0;background:var(--bg-card)}.demo-stage-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch;align-items:flex-start;justify-content:flex-start;flex-direction:column}.demo-stage-scroll>svg,.demo-stage-scroll>canvas{flex-shrink:0}.demo-stage.demo-stage--flow{container-type:inline-size;container-name:demo-stage;align-items:stretch;justify-content:flex-start;flex-direction:column;min-height:0;gap:12px}.demo-stage.demo-stage--flow>.l08-flow,.demo-stage.demo-stage--flow>.l08-board,.demo-stage.demo-stage--flow>.demo-flow{width:100%;min-width:0}.l08-flow{display:flex;flex-direction:column;gap:12px;width:100%;min-width:0}.l08-flow-lead{margin:0;font-size:var(--text-body);color:var(--fg-1);line-height:var(--read-line)}.l08-flow-note{margin:0}.l08-same-pair{display:grid;grid-template-columns:1fr 1fr;gap:10px;width:100%}.l08-same-line{min-width:0;padding:12px 14px;border:1.5px solid var(--fg-0);border-radius:var(--r-md);background:var(--bg-card);display:flex;flex-direction:column;gap:8px}.l08-same-text{font-size:1.05rem;font-weight:600;line-height:1.45;color:var(--fg-0);word-break:break-word;overflow-wrap:anywhere}.l08-same-text .l08-tail{color:var(--terracotta);font-weight:800;padding:1px 6px;border-radius:4px;background:var(--terracotta-bg);border:1px solid color-mix(in oklch,var(--terracotta) 45%,transparent)}.l08-same-key{display:flex;align-items:center;justify-content:center;gap:10px;padding:8px}.l08-same-key-eq{font-size:14px;font-weight:800;color:var(--amber)}.l08-gen-sentence{display:flex;flex-wrap:wrap;gap:6px;align-items:center;justify-content:center;min-height:3rem}.l08-gen-ch{display:inline-flex;align-items:center;justify-content:center;min-width:2.2rem;height:2.2rem;border-radius:8px;font-size:1.2rem;font-weight:800;border:1.5px solid var(--fg-0);background:var(--bg-card);color:var(--fg-0)}.l08-gen-ch.is-tail{border-color:var(--amber);background:var(--amber-bg);color:var(--amber)}.l08-gen-meta{margin:0;text-align:center;font-size:13px;font-weight:700;color:var(--fg-1);font-variant-numeric:tabular-nums}.l08-board{display:flex;flex-direction:column;gap:14px;width:100%;min-width:0;padding:14px;border-radius:var(--r-lg, 16px);border:1.5px solid var(--fg-0);background:var(--bg-card)}.l08-board-stats{display:flex;flex-wrap:wrap;gap:8px;align-items:center}.l08-stat,.l08-mode-pill{display:inline-flex;align-items:center;gap:4px;padding:4px 10px;border-radius:6px;font-size:12px;font-weight:700;font-variant-numeric:tabular-nums;border:1.5px solid var(--fg-0);background:var(--bg-card);color:var(--fg-0)}.l08-stat--hot{border-color:var(--amber);background:var(--amber-bg);color:var(--amber)}.l08-mode-pill{margin-left:auto;border-color:var(--amber);background:var(--amber-bg);color:var(--amber)}.l08-mode-pill.is-prob{border-color:var(--sky);background:var(--sky-bg);color:var(--sky)}.l08-board-flow{display:grid;grid-template-columns:auto minmax(28px,48px) minmax(0,1fr);gap:10px 12px;align-items:stretch;width:100%}.l08-tok{display:inline-flex;align-items:center;justify-content:center;min-width:2.4rem;height:2.4rem;padding:0 10px;border-radius:8px;font-size:1.25rem;font-weight:800;border:1.5px solid var(--fg-0);background:var(--bg-card);color:var(--fg-0)}.l08-tok--ink{border-color:var(--fg-0);background:var(--bg-card);color:var(--fg-0)}.l08-tok--hot{border-color:var(--terracotta);background:var(--terracotta-bg);color:var(--terracotta)}.l08-tok--lg{flex-direction:column;gap:4px;min-width:4.5rem;height:auto;min-height:5.5rem;padding:12px 14px;align-self:center}.l08-tok-label{font-size:11px;font-weight:700;letter-spacing:.06em;color:var(--fg-2)}.l08-tok-char{font-size:clamp(1.6rem,4vw,2rem);line-height:1}.l08-arrow{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;color:var(--amber);font-size:1.6rem;font-weight:800}.l08-arrow-shaft{width:100%;max-width:36px;height:3px;border-radius:2px;background:var(--amber)}.l08-arrow-head{line-height:1}.l08-next-grid{display:grid;gap:10px;min-width:0;align-items:stretch}.l08-next-grid.cols-1{grid-template-columns:minmax(0,160px)}.l08-next-grid.cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}.l08-next-grid.cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}.l08-next-grid.cols-4{grid-template-columns:repeat(4,minmax(0,1fr))}.l08-ballot{display:flex;flex-direction:column;align-items:center;gap:8px;min-width:0;padding:10px 8px 12px;border-radius:10px;border:1.5px solid var(--fg-0);background:var(--bg-card)}.l08-ballot.is-top{border-color:var(--terracotta)}.l08-ballot-viz{width:100%;height:110px;display:flex;align-items:flex-end;justify-content:center;padding:0 6px;border-radius:6px;background:color-mix(in oklch,var(--fg-0) 4%,#fff);border:1px dashed color-mix(in oklch,var(--fg-0) 22%,transparent)}.l08-ballot-col{width:min(100%,72px);min-height:18%;border-radius:6px 6px 3px 3px;background:var(--amber);display:flex;align-items:flex-end;justify-content:center;padding:6px 4px;transition:height .28s ease;overflow:hidden}.l08-board.is-prob .l08-ballot-col{background:var(--sky)}.l08-ballot.is-top .l08-ballot-col{background:var(--terracotta)}.l08-board.is-prob .l08-ballot.is-top .l08-ballot-col{background:var(--sky)}.l08-tickets{display:flex;flex-wrap:wrap;gap:3px;justify-content:center;width:100%}.l08-ticket{width:9px;height:11px;border-radius:1px;background:#fff;border:1px solid var(--fg-0)}.l08-ticket-more{font-size:10px;font-weight:800;color:#fff;width:100%;text-align:center}.l08-ballot-num{display:flex;flex-direction:column;align-items:center;gap:2px;font-variant-numeric:tabular-nums;text-align:center}.l08-ballot-num strong{font-size:1.05rem;font-weight:800;color:var(--fg-0)}.l08-ballot.is-top .l08-ballot-num strong{color:var(--terracotta)}.l08-board.is-prob .l08-ballot-num strong{color:var(--sky)}.l08-ballot-num span{font-size:11px;font-weight:600;color:var(--fg-2)}.l08-denom{display:flex;align-items:center;justify-content:center;min-height:36px;padding:8px 12px;border-radius:8px;border:1.5px dashed var(--amber);background:var(--amber-bg)}.l08-board.is-prob .l08-denom{border-color:var(--sky);background:var(--sky-bg)}.l08-denom-label{font-size:13px;font-weight:700;color:var(--fg-0);text-align:center}.l08-prev-chips .chip{min-width:2.75rem;justify-content:center;font-size:1rem;font-weight:800}.l08-count-actions{margin-top:10px}.l08-prob-bars{display:grid;gap:8px;width:100%}.l08-prob-row{padding:8px 12px;border:1.5px solid var(--fg-0);border-radius:8px;background:var(--bg-card)}.l08-prob-meta{display:flex;justify-content:space-between;gap:8px;margin-bottom:6px;align-items:center;font-size:13px;font-weight:650;color:var(--fg-0)}.l08-mini-tok{display:inline-flex;align-items:center;justify-content:center;min-width:1.7rem;height:1.7rem;padding:0 6px;border-radius:6px;font-weight:800;border:1.5px solid var(--fg-0);background:var(--bg-card);color:var(--fg-0)}.l08-mini-tok.is-hot{border-color:var(--terracotta);background:var(--terracotta-bg);color:var(--terracotta)}.l08-prob-track{height:8px;border-radius:3px;background:color-mix(in oklch,var(--fg-0) 8%,#fff);border:1px solid color-mix(in oklch,var(--fg-0) 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.demo-body{flex:1;min-height:0;overflow:auto}.demo-step-ctrl{margin-top:4px}.demo-step-dots{display:flex;gap:6px;margin-bottom:10px;flex-wrap:wrap}.demo-step-dot{width:8px;height:8px;border-radius:50%;background:var(--hairline-strong);transition:background .15s ease,transform .15s ease}.demo-step-dot.on{background:var(--sky);opacity:.45}.demo-step-dot.cur{background:var(--accent);opacity:1;transform:scale(1.2);box-shadow:0 0 0 3px var(--hl-pear, transparent)}.demo-step-progress{align-self:center}.demo-experiments{margin-bottom:16px;padding-bottom:14px;border-bottom:1px solid var(--hairline)}.demo-experiments-head{font-size:12px;font-weight:700;color:var(--fg-2);text-transform:uppercase;letter-spacing:.04em;margin-bottom:8px}.demo-experiment-list{list-style:none;margin:0;padding:0;display:grid;gap:6px}.demo-experiment{display:flex;gap:8px;align-items:flex-start;font-size:13px;color:var(--fg-1);line-height:1.4}.demo-experiment-check{flex-shrink:0;font-weight:700;color:var(--fg-2);width:1.1em}.demo-experiment.done,.demo-experiment.done .demo-experiment-check{color:var(--sage)}.demo-histogram{margin-top:14px;padding-top:12px;border-top:1px solid var(--hairline)}.demo-histogram-head{font-size:12px;font-weight:700;color:var(--fg-2);margin-bottom:8px}.demo-histogram-bars{display:flex;gap:4px;align-items:flex-end;min-height:48px}.demo-histogram-col{flex:1;display:flex;flex-direction:column;align-items:center;gap:4px;min-width:0}.demo-histogram-bar{width:100%;max-width:36px;border-radius:3px 3px 0 0;background:var(--sky);min-height:2px;transition:height .2s ease}.demo-histogram-col.cut .demo-histogram-bar{background:var(--fg-2);opacity:.35}.demo-histogram-col.leader .demo-histogram-bar{background:var(--accent)}.demo-histogram-lbl{font-size:10px;color:var(--fg-1);text-align:center;overflow:hidden;text-overflow:ellipsis;width:100%;max-width:40px}.demo-histogram-pct{font-size:10px;color:var(--fg-2);font-variant-numeric:tabular-nums}.demo-histogram-empty{font-size:12px;color:var(--fg-2)}.demo-token-bar{margin-bottom:14px}.demo-token-bar-head{display:flex;justify-content:space-between;align-items:baseline;font-size:12px;font-weight:600;color:var(--fg-2);margin-bottom:6px}.demo-token-track{display:flex;height:12px;border-radius:var(--r-pill);overflow:hidden;border:1px solid var(--hairline);background:var(--bg-inset)}.demo-token-track--fill{display:block;height:8px}.demo-token-fill{height:100%;border-radius:inherit;transition:width .35s ease,background .2s ease}.demo-token-fill--sky,.demo-token-fill--sage{background:var(--sky)}.demo-token-fill--terracotta{background:var(--terracotta)}.demo-token-fill--amber{background:var(--amber)}.demo-token-seg{height:100%;transition:flex .25s ease;min-width:2px}.demo-token-seg.sys{background:var(--amber)}.demo-token-seg.rounds{background:var(--sky)}.demo-token-seg.free{background:transparent}.demo-token-seg.warn{background:var(--terracotta);opacity:.85}.demo-token-legend{display:flex;flex-wrap:wrap;gap:8px 14px;margin-top:8px;font-size:11px;color:var(--fg-2)}.demo-token-legend span:before{content:"";display:inline-block;width:8px;height:8px;border-radius:2px;margin-right:5px;vertical-align:middle}.demo-token-legend .lg-sys:before{background:var(--amber)}.demo-token-legend .lg-rounds:before{background:var(--sky)}.demo-token-legend .lg-free:before{background:var(--bg-inset);border:1px solid var(--hairline)}@media (max-width: 700px){.demo-side{position:sticky;bottom:0;z-index:2;background:var(--bg-card);box-shadow:0 -8px 24px var(--overlay)}}.chips{display:flex;gap:var(--space-xs);flex-wrap:wrap;align-items:center}.chip{font-family:inherit;font-size:var(--text-caption);font-weight:600;min-height:var(--hit-min);padding:0 var(--space-md);display:inline-flex;align-items:center;justify-content:center;border-radius:var(--r-pill);cursor:pointer;color:var(--fg-1);background:var(--glass);border:1px solid var(--hairline-strong);box-shadow:0 1px 0 0 var(--hairline);transition:color var(--dur-fast) var(--ease-out),background var(--dur-fast) var(--ease-out),border-color var(--dur-fast) var(--ease-out),box-shadow var(--dur-fast) var(--ease-out),transform var(--dur-fast) var(--ease-out)}@media (hover: hover){.chip:hover:not(:disabled){border-color:var(--sky);box-shadow:0 1px 0 0 var(--hairline-strong);transform:translateY(-1px)}}.chip:active:not(:disabled){box-shadow:none;transform:translateY(1px)}.chip:focus-visible{outline:3px solid var(--focus-ring);outline-offset:2px}.chip:disabled{opacity:.45;cursor:not-allowed;box-shadow:none}.chip:disabled:hover{border-color:var(--hairline-strong);background:var(--glass);transform:none}.chip[data-state=loading]{cursor:progress;opacity:.72}.chip[data-state=error]{border-color:var(--terracotta);color:var(--terracotta)}.chip[data-state=success]{border-color:var(--sage);color:var(--sage)}.chip.active,.chip.is-open{background:var(--accent);color:var(--on-accent);border-color:var(--accent);box-shadow:0 2px 0 0 var(--accent-deep),0 4px 14px -4px var(--btn-cast, transparent)}.chip.active:hover:not(:disabled),.chip.is-open:hover:not(:disabled){box-shadow:0 2px 0 0 var(--accent-deep),0 4px 14px -4px var(--btn-cast, transparent);transform:translateY(-1px)}@media (prefers-reduced-motion: reduce){.chip{transition-duration:.01ms}.chip:hover:not(:disabled),.chip:active:not(:disabled),.chip.active:hover:not(:disabled),.chip.is-open:hover:not(:disabled){transform:none}}.chip.chip--sage.active{background:var(--sky-bg);color:var(--sky);border-color:var(--sky);box-shadow:0 2px color-mix(in oklch,var(--sky) 55%,var(--fg-0))}.chip.chip--warn.active{background:var(--terracotta-bg);color:var(--terracotta);border-color:var(--terracotta);box-shadow:0 2px color-mix(in oklch,var(--terracotta) 55%,var(--fg-0))}.l08-count-actions .chip.chip--sky:not(.active){color:var(--sky);border-color:color-mix(in oklch,var(--sky) 45%,var(--hairline));background:var(--sky-bg)}.l08-count-actions .chip.chip--amber:not(.active){color:var(--amber);border-color:color-mix(in oklch,var(--amber) 45%,var(--hairline));background:var(--amber-bg)}.l08-count-actions .chip.chip--sky.active{background:var(--sky);color:#fff;border-color:var(--sky);box-shadow:0 2px color-mix(in oklch,var(--sky) 55%,var(--fg-0))}.l08-count-actions .chip.chip--amber.active{background:var(--amber);color:#fff;border-color:var(--amber);box-shadow:0 2px color-mix(in oklch,var(--amber) 55%,var(--fg-0))}.use-card.is-lit--sage{border-color:var(--fg-0)}.l11-pe-flow,.l11-mask-flow{display:flex;flex-direction:column;gap:14px;width:100%;min-width:0}.l11-pe-pair{display:grid;grid-template-columns:1fr 1fr;gap:12px;width:100%}.l11-pe-card{min-width:0;padding:14px 16px;display:flex;flex-direction:column;gap:10px}.l11-pe-sent{font-size:clamp(1.15rem,2.2vw,1.4rem);font-weight:700;letter-spacing:.12em;line-height:1.4;text-align:center}.l11-pe-meta{min-height:2rem}.l11-pe-stamps{display:flex;flex-wrap:wrap;gap:6px;justify-content:center}.l11-pe-stamp{display:inline-flex;align-items:center;padding:3px 8px;border-radius:var(--r-pill);font-size:12px;font-weight:700;color:var(--sky);background:var(--sky-bg);border:1px solid color-mix(in oklch,var(--sky) 45%,var(--hairline))}.l11-pe-bag{display:block;text-align:center;font-size:12.5px;font-weight:600;color:var(--terracotta)}.l11-pe-flow.is-off .l11-pe-card{border-style:dashed}.l11-pe-note,.l11-mask-note,.l11-mask-query{margin:0;font-size:var(--text-body);line-height:var(--read-line);color:var(--fg-1);text-align:start}.l11-mask-query{font-size:.92rem;color:var(--fg-2);font-weight:600}.l11-mask-grid{display:grid;gap:6px;width:100%;max-width:28rem;margin-inline:0}.l11-mask-head,.l11-mask-rowlab{font-size:12px;font-weight:700;text-align:center;color:var(--fg-1)}.l11-mask-rowlab{text-align:left;align-self:center}.l11-mask-cell{font-family:inherit;font-size:12px;font-weight:700;min-height:2rem;border-radius:var(--r-sm);border:1px solid var(--hairline-strong);background:var(--bg-card);color:var(--sky);cursor:pointer;transition:border-color .15s ease,background .15s ease,opacity .15s ease}.l11-mask-cell.is-block{color:var(--fg-2);opacity:.45;background:var(--bg-inset)}.l11-mask-cell.is-row{box-shadow:inset 0 0 0 1px var(--accent);border-color:var(--accent)}.l11-mask-grid.is-leak .l11-mask-cell.is-ok{color:var(--terracotta);border-color:color-mix(in oklch,var(--terracotta) 40%,var(--hairline))}@container demo-stage (max-width: 420px){.l11-pe-pair{grid-template-columns:1fr}}.chip--sm{font-size:var(--text-label);min-height:36px;padding:0 var(--space-sm);box-shadow:0 1px 0 0 var(--hairline)}.chip--sm.active,.chip--sm.is-open{box-shadow:0 2px 0 0 var(--accent-deep)}.chip--sm.active:hover:not(:disabled),.chip--sm.is-open:hover:not(:disabled){box-shadow:0 2px 0 0 var(--accent-deep)}.demo-stage .card:not(.demo):not(.use-card){background:transparent;border:0;box-shadow:none;border-radius:0;padding:0;transform:none}.demo-stage .card:not(.demo):not(.use-card):hover{transform:none;box-shadow:none;border-color:transparent}.demo-stage .use-card{border:1px solid var(--hairline);border-radius:var(--r-md);background:var(--bg-inset);box-shadow:none;transition:opacity var(--dur-base) var(--ease-out),border-color var(--dur-base) var(--ease-out)}.use-card.is-dim{opacity:.4}.use-card.is-idle{opacity:.55}.use-card.is-lit{opacity:1}.use-card.is-lit--sky{border-color:var(--sky)}.use-card.is-lit--terracotta{border-color:var(--terracotta)}.use-card.is-lit--amber{border-color:var(--amber)}.use-card.is-tone-sage{border-color:var(--fg-0);background:var(--bg-card)}.use-card.is-tone-terracotta{border-color:var(--terracotta);background:color-mix(in oklch,var(--terracotta-bg) 55%,var(--bg-card))}.use-card.is-tone-sky{border-color:var(--sky);background:color-mix(in oklch,var(--sky-bg) 55%,var(--bg-card))}.use-card.is-tone-amber{border-color:var(--amber);background:color-mix(in oklch,var(--amber-bg) 55%,var(--bg-card))}.demo-verdict--sage{color:var(--sky)}.demo-verdict--terracotta{color:var(--terracotta)}.demo-verdict--sky{color:var(--sky)}.demo-verdict--amber{color:var(--amber)}.demo-comm-tag{display:inline-block;margin-top:8px;padding:2px 8px;border-radius:999px;border:1px solid;font-size:11px;line-height:1.3}.demo-comm-tag--terracotta,.demo-comm-tag-text--terracotta{color:var(--terracotta);border-color:var(--terracotta)}.demo-comm-tag--sky,.demo-comm-tag-text--sky{color:var(--sky);border-color:var(--sky)}.demo-comm-tag-text{font-weight:600}.demo-sandbox{position:relative;min-height:220px;padding:18px 20px;border:2px dashed var(--amber);border-radius:var(--r-md);background:var(--bg-inset)}.demo-sandbox.is-blocked{border-style:solid;border-color:var(--rose);opacity:.85}.demo-sandbox-veil{position:absolute;top:0;right:0;bottom:0;left:0;border-radius:inherit;background:#c536371f;border:3px solid var(--rose);pointer-events:auto;z-index:2}.demo-file-row{padding:2px 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.val{font-size:13px;font-weight:700;min-width:44px;text-align:right;font-variant-numeric:tabular-nums}.flip-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.flip-card{font-family:inherit;text-align:left;display:flex;flex-direction:column;align-items:flex-start;height:100%;min-height:9.5rem;padding:20px 22px;color:inherit;background:var(--bg-card);border:1px solid var(--hairline);border-radius:var(--r-lg);box-shadow:var(--shadow-card);transition:none}.flip-card:hover{border-color:var(--sky);box-shadow:var(--shadow-card-hover)}.flip-card .fc-q{flex:1;font-size:.95rem;font-weight:600;line-height:var(--read-line-tight)}.flip-card .fc-tap{margin-top:auto;flex-shrink:0}.flip-card .fc-a{margin-top:12px;width:100%}.flip-card .fc-a .why{font-size:.88rem;color:var(--fg-1);margin-top:8px;line-height:var(--read-line)}.flip-card.revealed{border-color:var(--hairline-strong);background:var(--sky-bg);cursor:default}.flip-card.revealed:hover{transform:none;box-shadow:var(--shadow-card);border-color:var(--hairline-strong)}@media (max-width: 700px){.demo-body{grid-template-columns:1fr}.demo-side{border-left:none;border-top:1px solid var(--hairline)}.flip-grid{grid-template-columns:1fr}}@media (prefers-reduced-motion: reduce){.pager a:hover,.flip-card:hover,.chip:hover,.chip:active,.demo-fs-btn:hover,.demo-fs-btn:active,.quiz-toggle:hover,.flip-card.revealed:hover{transform:none;transition-duration:.01ms}.demo-live-dot.is-live{animation:none}}:root{--immersive-max: min(72rem, calc(100vw - 2 * var(--page-gutter) - 24px));--immersive-bar-h: 52px}.immersive-enter{margin-top:1.25rem;display:inline-flex;align-items:center;gap:6px}.immersive-bar{position:sticky;top:0;z-index:55;background:var(--nav-glass);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);border-bottom:1px solid var(--hairline)}.immersive-bar-inner{max-width:var(--immersive-max);margin:0 auto;min-height:var(--immersive-bar-h);padding:10px calc(var(--page-gutter) + env(safe-area-inset-right,0px)) 10px calc(var(--page-gutter) + env(safe-area-inset-left,0px));display:flex;align-items:center;justify-content:space-between;gap:16px}.immersive-bar-title{margin:0;min-width:0;display:flex;align-items:baseline;gap:10px;font-size:14px;line-height:1.35;color:var(--fg-1)}.immersive-bar-no{flex:none;font-family:var(--font-mono);font-size:12px;font-weight:600;color:var(--fg-2)}.immersive-bar-name{font-weight:600;color:var(--fg-0);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.immersive-exit{flex:none;display:inline-flex;align-items:center;gap:6px}html.immersive-reading .container-immersive{max-width:var(--immersive-max);margin-left:auto!important;margin-right:auto!important;padding-top:clamp(28px,5vw,48px)}html.immersive-reading .lesson-hero--immersive{padding-top:0;margin-bottom:2rem;border-bottom:1px solid var(--hairline);padding-bottom:1.75rem}html.immersive-reading .lesson-hero--immersive h1{font-size:clamp(1.75rem,4vw,2.35rem);max-width:none}html.immersive-reading .immersive-hero-meta{margin:0}html.immersive-reading .lesson-hero--immersive .subhead{margin-top:1.1rem;max-width:none;font-size:1.05rem;color:var(--fg-1)}html.immersive-reading .lsec h2{font-size:clamp(1.25rem,3vw,1.5rem)}html.immersive-reading .lesson-footer{max-width:var(--immersive-max);margin-left:auto;margin-right:auto}@media (max-width: 520px){.immersive-bar-name{white-space:normal;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}}.lesson-annotate-root{user-select:text;-webkit-user-select:text}.anno--marker.anno--pear{background:var(--hl-pear);border-radius:2px}.anno--marker.anno--amber{background:#fb9d5973;border-radius:2px}.anno--marker.anno--sky{background:#009edb38;background:oklch(66% .18 235 / .22);border-radius:2px}.anno--underline.anno--pear{text-decoration:underline solid oklch(76% .2 95);text-underline-offset:3px}.anno--underline.anno--amber{text-decoration:underline solid var(--amber);text-underline-offset:3px}.anno--underline.anno--sky{text-decoration:underline solid var(--sky);text-underline-offset:3px}.anno--wavy.anno--pear{text-decoration:underline wavy oklch(76% .2 95);text-underline-offset:3px}.anno--wavy.anno--amber{text-decoration:underline wavy var(--amber);text-underline-offset:3px}.anno--wavy.anno--sky{text-decoration:underline wavy var(--sky);text-underline-offset:3px}.anno[data-anno-id]{cursor:pointer}.anno[data-note]{cursor:help}.anno-toolbar{position:fixed;z-index:200;transform:translate(-50%,calc(-100% - 14px));min-width:max-content;background:#182029;color:#f5f1ea;border-radius:var(--r-md);padding:8px 10px 10px;box-shadow:0 10px 28px #00000047}.anno-toolbar--below{transform:translate(-50%,14px)}.anno-toolbar-row{display:flex;align-items:flex-end;gap:2px}.anno-tool{display:flex;flex-direction:column;align-items:center;gap:4px;padding:6px 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10px;text-align:left;border-top:1px solid var(--hairline)}.section-head--split{display:grid;grid-template-columns:minmax(0,1fr) minmax(220px,300px);gap:24px;align-items:start}.section-scene{margin-top:8px}.foundation-entry{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:24px;align-items:center;padding:24px 28px;margin:0 0 var(--space-stack-lg);background:var(--bg-card)}.foundation-entry h3{margin:4px 0 8px;font-size:clamp(1.25rem,2vw,1.65rem);line-height:var(--read-line-tight)}.foundation-entry p{margin:0;color:var(--fg-1);line-height:var(--read-line)}.foundation-page{--page-gutter: clamp(16px, 4vw, 28px);padding:var(--nav-height) 0 0}.foundation-page .container-narrow{max-width:82rem}.foundation-hero{padding-top:clamp(48px,8vw,86px);padding-bottom:var(--space-stack-xl)}.foundation-hero h1{margin:10px 0 14px;font-size:clamp(2.4rem,6vw,4.6rem);line-height:1.04;letter-spacing:0}.foundation-finder{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:14px 18px;align-items:center;margin-bottom:18px;padding:14px;border:1px solid var(--hairline);border-radius:var(--r-md);background:color-mix(in srgb,var(--bg-card) 86%,var(--accent) 14%);box-shadow:var(--shadow-soft)}.foundation-finder__search{display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:10px;align-items:center;min-width:0}.foundation-finder__search>span{color:var(--fg-2);font-size:.86rem;font-weight:700}.foundation-finder__search input{width:100%;min-height:42px;border:1px solid var(--hairline);border-radius:var(--r-sm);padding:0 12px;background:var(--bg);color:var(--fg-0);font:inherit}.foundation-finder__search input:focus{outline:2px solid color-mix(in srgb,var(--accent) 42%,transparent);outline-offset:2px}.foundation-finder__search button,.foundation-filter button{min-height:36px;border:1px solid var(--hairline);border-radius:999px;background:var(--bg-card);color:var(--fg-1);font:inherit;font-size:.86rem;cursor:pointer}.foundation-finder__search button{padding:0 12px}.foundation-finder__meta{display:flex;flex-direction:column;align-items:flex-end;gap:2px;color:var(--fg-2);font-size:.82rem;white-space:nowrap}.foundation-finder__meta strong{color:var(--fg-0);font-family:var(--font-mono);font-size:1.35rem;line-height:1}.foundation-filter{grid-column:1 / -1;display:flex;flex-wrap:wrap;gap:8px}.foundation-filter button{display:inline-flex;align-items:center;gap:7px;padding:0 12px}.foundation-filter button:hover,.foundation-filter button.active{border-color:var(--accent);color:var(--fg-0);background:var(--bg-lift)}.foundation-filter button span{color:var(--fg-2);font-family:var(--font-mono);font-size:.75rem}.foundation-quick{display:grid;grid-template-columns:.58fr 1fr;gap:16px;align-items:start;margin-bottom:24px}.foundation-quick__head{padding:14px 0}.foundation-quick__head span{color:var(--fg-0);font-size:1rem;font-weight:800}.foundation-quick__head p{margin:6px 0 0;color:var(--fg-2);line-height:1.55}.foundation-quick__grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.foundation-quick__grid a{display:grid;grid-template-columns:auto minmax(0,1fr);gap:8px;align-items:center;min-height:48px;padding:9px 11px;border:1px solid var(--hairline);border-radius:var(--r-sm);background:var(--bg-card);color:var(--fg-1)}.foundation-quick__grid a:hover{border-color:var(--accent);color:var(--fg-0);background:var(--bg-lift)}.foundation-quick__grid span{color:var(--accent);font-family:var(--font-mono);font-size:.78rem}.foundation-quick__grid strong{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:.9rem}.foundation-jump{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:28px}.foundation-jump a{display:inline-flex;align-items:center;gap:8px;min-height:36px;padding:7px 12px;border:1px solid var(--hairline);border-radius:999px;background:var(--bg-card);color:var(--fg-1);font-size:.92rem}.foundation-jump a:hover{border-color:var(--accent);color:var(--fg-0)}.foundation-jump span{color:var(--fg-2);font-family:var(--font-mono);font-size:.78rem}.foundation-map{display:flex;flex-direction:column;gap:34px;padding-bottom:clamp(56px,10vw,96px)}.foundation-group{scroll-margin-top:calc(var(--nav-height) + 18px)}.foundation-group__head{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:16px;align-items:baseline;margin-bottom:12px}.foundation-group__head h2{margin:0;font-size:clamp(1.35rem,2.4vw,1.9rem);line-height:var(--read-line-tight)}.foundation-group__head span{color:var(--fg-2);font-family:var(--font-mono);font-size:.85rem}.foundation-grid{display:flex;flex-direction:column;gap:10px}.foundation-card{border:1px solid var(--hairline);border-radius:var(--r-md);background:var(--bg-card);overflow:hidden;scroll-margin-top:calc(var(--nav-height) + 18px)}.foundation-card[open]{box-shadow:var(--shadow-card)}.foundation-card__summary{display:grid;grid-template-columns:auto 192px minmax(0,1fr) auto;gap:6px 16px;align-items:center;padding:14px 18px;cursor:pointer;list-style:none;min-width:0}.foundation-card__summary::-webkit-details-marker{display:none}.foundation-card__summary:after{content:"+";grid-column:4;grid-row:1;align-self:start;color:var(--fg-2);font-family:var(--font-mono);font-size:1rem;line-height:1.4}.foundation-card[open] .foundation-card__summary:after{content:"-"}.foundation-card__kicker{grid-column:1;grid-row:1 / span 3;align-self:start}.foundation-card__thumb{grid-column:2;grid-row:1 / span 3;display:block;width:192px;aspect-ratio:16 / 9;overflow:hidden;border:1px solid var(--hairline);border-radius:var(--r-sm);background:#fff}.foundation-card__thumb img{display:block;width:100%;height:100%;object-fit:contain}.foundation-card[open] .foundation-card__thumb{display:none}.foundation-card__title{grid-column:3;grid-row:1;color:var(--fg-0);font-size:clamp(1.02rem,1.4vw,1.18rem);font-weight:700;line-height:var(--read-line-tight);overflow-wrap:anywhere}.foundation-card__lead{grid-column:3;grid-row:2;color:var(--fg-1);font-size:.94rem;line-height:1.5;overflow-wrap:anywhere;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.foundation-card[open] .foundation-card__lead{display:block;-webkit-line-clamp:unset}.foundation-card__tags{grid-column:3;grid-row:3;display:flex;flex-wrap:wrap;gap:6px;margin-top:4px}.foundation-card__tags span{display:inline-flex;align-items:center;min-height:22px;padding:3px 7px;border-radius:999px;background:var(--bg-inset);color:var(--fg-2);font-size:.76rem;line-height:1.1}.foundation-card__detail{display:grid;grid-template-columns:minmax(620px,1.25fr) minmax(320px,.75fr);gap:20px;align-items:start;padding:0 18px 18px}.foundation-card:not([open]) .foundation-card__detail{display:none}.foundation-card__body{min-width:0;max-width:36rem;overflow-wrap:anywhere}.foundation-note,.foundation-warning,.foundation-connect{margin-top:14px;padding-top:14px;border-top:1px solid var(--hairline)}.foundation-note{margin-top:0;padding-top:0;border-top:0}.foundation-note p,.foundation-warning p{margin:4px 0 0;line-height:1.72;color:var(--fg-1);font-size:.98rem}.foundation-list{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}.foundation-list span,.foundation-links a{display:inline-flex;align-items:center;min-height:30px;padding:5px 10px;border:1px solid var(--hairline);border-radius:999px;background:var(--bg-inset);color:var(--fg-1);font-size:.88rem;line-height:1.2}.foundation-links{display:flex;flex-wrap:wrap;gap:8px;margin-top:8px}.foundation-links a:hover{border-color:var(--accent);color:var(--fg-0)}.foundation-card__image{margin:0;position:sticky;top:calc(var(--nav-height) + 14px)}.foundation-card__image img{background:#fff;min-height:360px;max-height:620px;object-fit:contain}.foundation-empty{padding:24px;border:1px dashed var(--hairline);border-radius:var(--r-md);background:var(--bg-card);text-align:center}.foundation-empty strong{color:var(--fg-0)}.foundation-empty p{margin:6px 0 0;color:var(--fg-2)}.lesson-illus{margin:var(--space-stack-md) auto;max-width:min(48rem,88%);border:1px solid var(--hairline);border-radius:var(--r-md);overflow:hidden;background:var(--bg-card)}.lesson-illus--concept{margin:0 auto var(--space-stack-lg);background:var(--bg-card)}.lesson-illus--bare{max-width:min(48rem,100%);border:0;border-radius:0;background:transparent;overflow:visible}.lesson-illus--bare img{background:transparent}.lesson-illus--bare figcaption{border-top:0;padding:6px 0 0;text-align:left}.lesson-illus__open{display:block;width:100%;border:0;padding:0;margin:0;background:transparent;cursor:zoom-in}.lesson-illus__open picture{display:block}.lesson-illus__open:focus-visible{outline:3px solid var(--accent);outline-offset:-3px}.lesson-illus__open:hover img{filter:brightness(.98)}.lesson-illus img{display:block;width:100%;height:auto;aspect-ratio:16 / 9;object-fit:contain;background:var(--bg-card)}.lesson-illus figcaption{padding:8px 14px 10px;border-top:1px solid var(--hairline);text-align:center}.image-lightbox{position:fixed;top:0;right:0;bottom:0;left:0;z-index:220;display:flex;align-items:center;justify-content:center;padding:clamp(16px,4vw,40px);background:var(--overlay-strong);cursor:zoom-out}.image-lightbox__panel{position:relative;max-width:min(1120px,100%);max-height:100%;display:flex;flex-direction:column;gap:10px;cursor:default}.image-lightbox__panel img{display:block;width:auto;max-width:100%;max-height:min(78vh,820px);height:auto;object-fit:contain;border-radius:var(--r-md);background:var(--bg-card);box-shadow:var(--shadow-card-hover)}.image-lightbox__caption{max-width:900px;margin:0 auto;padding:8px 12px;border-radius:var(--r-sm);color:var(--fg-0);background:var(--bg-card);box-shadow:var(--shadow-card)}.image-lightbox__close{position:absolute;top:-12px;right:-12px;z-index:1;width:36px;height:36px;border:1px solid var(--hairline);border-radius:50%;background:var(--bg-card);color:var(--fg-0);font-size:24px;line-height:1;cursor:pointer;box-shadow:var(--shadow-card)}.image-lightbox__close:focus-visible{outline:3px solid var(--accent);outline-offset:2px}.search-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:240;display:flex;align-items:flex-start;justify-content:center;padding:clamp(56px,12vh,140px) 16px 24px;background:var(--overlay-strong)}.search-panel{width:min(640px,100%);display:flex;flex-direction:column;background:var(--bg-card);border:1px solid var(--hairline);border-radius:var(--r-lg, 16px);box-shadow:var(--shadow-card-hover);overflow:hidden}.search-inputbar{display:flex;align-items:center;gap:10px;padding:14px 16px;border-bottom:1px solid var(--hairline)}.search-inputbar__icon{flex:0 0 auto;color:var(--fg-2)}.search-input{flex:1 1 auto;min-width:0;border:none;outline:none;background:none;font-size:1.0625rem;color:var(--fg-0);font-family:inherit}.search-input::placeholder{color:var(--fg-2)}.search-clear{flex:0 0 auto;width:26px;height:26px;border-radius:50%;border:1px solid var(--hairline);background:var(--bg-inset);color:var(--fg-1);font-size:18px;line-height:1;cursor:pointer}.search-clear:hover{color:var(--fg-0);border-color:var(--accent)}.search-results{list-style:none;margin:0;padding:6px;max-height:min(52vh,440px);overflow-y:auto}.search-result{display:flex;align-items:flex-start;gap:10px;width:100%;text-align:left;padding:10px 12px;border:none;border-radius:var(--r-sm, 10px);background:none;color:inherit;cursor:pointer}.search-result.is-active{background:var(--accent-bg, var(--sky-bg))}.search-result__tag{flex:0 0 auto;margin-top:2px;font-size:11px;font-weight:600;line-height:1.5;padding:1px 8px;border-radius:var(--r-pill);color:var(--fg-1);background:var(--bg-inset);border:1px solid var(--hairline);white-space:nowrap}.search-result__tag--term{color:var(--accent);border-color:var(--accent);background:var(--accent-bg, var(--sky-bg))}.search-result__text{display:flex;flex-direction:column;gap:2px;min-width:0}.search-result__title{font-size:.95rem;font-weight:650;color:var(--fg-0)}.search-result__sub{font-size:var(--text-caption);color:var(--fg-2);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.search-empty{padding:28px 16px;text-align:center;color:var(--fg-2);font-size:.95rem}.search-empty--hint{color:var(--fg-2)}.search-foot{padding:8px 14px;border-top:1px solid var(--hairline);font-size:var(--text-caption);color:var(--fg-2)}.idea-card--0{background:#f5ce0024;background:oklch(86% .18 95 / .14);border-color:#d0af0159;border-color:oklch(76% .2 95 / .35)}.idea-card--1{background:#009edb1a;background:oklch(66% .18 235 / .1);border-color:#009edb47;border-color:oklch(66% .18 235 / .28)}.idea-card--2{background:#ff506514;background:oklch(68% .24 18 / .08);border-color:#ff506538;border-color:oklch(68% .24 18 / .22)}.idea-card--0 .idea-tag{color:#917900;color:oklch(58% .14 95)}.idea-card--1 .idea-tag{color:var(--accent-cyan)}.idea-card--2 .idea-tag{color:var(--accent-coral)}.idea-card .idea-tag{font-family:var(--font-mono);font-size:11px;font-weight:500;letter-spacing:.08em;text-transform:uppercase;color:var(--fg-2);margin-bottom:12px}.path-overall-progress{margin-bottom:clamp(1.5rem,4vw,2.25rem);max-width:420px}.stage{margin-bottom:14px}.stage--collapsible{border:1px solid var(--hairline);border-radius:var(--r-md);background:var(--bg-card);overflow:hidden}.stage--collapsible[open]{margin-bottom:clamp(1.5rem,4vw,2rem);box-shadow:var(--shadow-card)}.stage-head{display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:12px 18px;align-items:center;padding:18px 22px;cursor:pointer;list-style:none}.stage-head::-webkit-details-marker{display:none}.stage-head:after{content:"+";color:var(--fg-2);font-family:var(--font-mono);font-size:1rem}.stage--collapsible[open] .stage-head:after{content:"-"}.stage-num{font-size:13px;font-weight:700;letter-spacing:.08em;color:var(--on-accent);background:var(--accent);padding:3px 12px;border-radius:var(--r-pill)}.stage-title-wrap{min-width:0}.stage-head h3{font-size:clamp(1.15rem,2.8vw,1.375rem);font-weight:700;letter-spacing:-.01em;margin:0;line-height:1.35}.stage-head .goal{display:block;font-size:14px;color:var(--fg-1);margin-top:.25rem;line-height:1.55}.stage--collapsible:not([open]) .stage-head .goal{display:none}.stage-meta{display:flex;align-items:center;justify-content:flex-end;flex-wrap:wrap;gap:8px;min-width:max-content}.stage-expand-hint{flex:1 1 100%;text-align:right;color:var(--fg-2)}.stage--collapsible:not([open]) .stage-expand-hint{display:block}.stage--collapsible[open] .stage-expand-hint{display:none}.stage--collapsible .row-list{margin:0;border-width:1px 0 0;border-radius:0;box-shadow:none}.row-list--compact .lesson{grid-template-columns:40px minmax(0,1fr) auto;padding:12px clamp(16px,3vw,22px);gap:4px 14px}.row-list--compact .lesson-title{font-size:15px}.lesson-desc--compact{grid-column:2;font-size:12px;line-height:1.4}.lesson{display:grid;grid-template-columns:44px 1fr auto;gap:8px 16px;align-items:baseline;padding:clamp(16px,3vw,20px) clamp(18px,3vw,24px);color:inherit;text-decoration:none;transition:background .15s ease,transform .14s var(--ease-snap)}a.lesson:hover{background:var(--sky-bg)}a.lesson:hover .lesson-no{color:var(--sky)}a.lesson:hover .lesson-title{color:var(--fg-0)}.lesson-no{font-size:13px;font-weight:600;color:var(--fg-2);font-variant-numeric:tabular-nums}.lesson-title{font-size:16px;font-weight:600;display:flex;align-items:center;gap:8px;flex-wrap:wrap}.lesson-desc{grid-column:2;font-size:14px;color:var(--fg-1);line-height:1.65}.lesson-meta{display:flex;align-items:center;gap:10px;justify-self:end}.lesson-meta .footnote{white-space:nowrap}.lesson--done{background:var(--sage-bg)}.lesson--reading{background:#009edb14;background:oklch(66% .18 235 / .08)}.lesson--reading .lesson-no{color:var(--sky)}.lesson-read-pct{color:var(--sky);font-weight:600;font-size:13px}.lesson--done .lesson-no{color:var(--sage)}.lesson--done .lesson-title{color:var(--fg-0)}.lesson-done-mark{flex:none;font-size:12px;font-weight:700;color:var(--sage);margin-left:2px}.stage-progress-pill{margin-left:auto}@media (max-width: 760px){.stage-progress-pill{margin-left:0}}.usage-flow{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin-top:18px}.usage-step{display:inline-flex;align-items:center;gap:8px;background:var(--bg-card);border:1px solid var(--hairline);border-radius:var(--r-pill);padding:10px 18px;font-size:14px;font-weight:500;box-shadow:none;transition:none}.usage-step:hover{border-color:var(--sky);background:var(--bg-lift);box-shadow:var(--shadow-card)}.usage-step b{font-weight:700;color:var(--accent-deep)}.usage-arrow{color:var(--fg-2);font-size:14px;font-family:var(--font-mono)}@media (max-width: 900px){.hero-split{grid-template-columns:1fr;gap:32px}.hero-copy h1{max-width:none;text-wrap:balance}.hero-copy .subhead{max-width:none}.section-head--split{grid-template-columns:1fr}.section-scene{max-width:100%;width:100%}}@media (max-width: 1100px){.foundation-card__detail{grid-template-columns:1fr}.foundation-card__body{max-width:none}.foundation-card__image{position:static}.foundation-card__image img{min-height:auto;max-height:none}}@media (max-width: 760px){.idea-grid,.section-head--split{grid-template-columns:1fr}.section-scene{max-width:100%;width:100%}.foundation-entry{grid-template-columns:1fr;padding:20px}.foundation-entry .btn{width:100%;justify-content:center}.home-entry-grid{grid-template-columns:1fr}.foundation-hero{padding-top:34px}.foundation-hero h1{font-size:clamp(2.1rem,11vw,3rem)}.foundation-finder{grid-template-columns:1fr;padding:12px}.foundation-finder__search{grid-template-columns:1fr auto}.foundation-finder__search>span{grid-column:1 / -1}.foundation-finder__meta{align-items:flex-start}.foundation-filter{flex-wrap:nowrap;overflow-x:auto;padding-bottom:2px;-webkit-overflow-scrolling:touch}.foundation-filter button{flex:0 0 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reduce){.l26-ctx-fill,.l26-skill-item{transition:none!important}}.demo-body.single{display:block}.demo-body.single .demo-stage{width:100%}