@import"https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap";:root{color-scheme:light dark;--bg-0: oklch(98% .006 85);--bg-card: oklch(99.2% .004 85);--bg-lift: oklch(99.6% .003 85);--bg-inset: oklch(95.5% .008 85);--bg-band-pear: oklch(96.5% .008 85);--bg-band-cyan: oklch(96% .01 85);--bg-band-coral: oklch(96% .012 45);--fg-0: oklch(22% .012 60);--fg-1: oklch(22% .012 60 / .72);--fg-2: oklch(22% .012 60 / .52);--accent: oklch(54% .14 45);--accent-deep: oklch(47% .14 45);--accent-cyan: oklch(54% .14 45);--accent-coral: oklch(54% .14 45);--on-accent: oklch(99% .004 85);--hl-pear: oklch(54% .14 45 / .38);--hairline: oklch(22% .012 60 / .1);--hairline-strong: oklch(22% .012 60 / .16);--glass: oklch(99% .004 85 / .72);--nav-glass: oklch(98% .006 85 / .88);--sage: oklch(52% .1 150);--terracotta: var(--accent-coral);--amber: oklch(62% .12 55);--sky: var(--accent);--sage-bg: oklch(52% .1 150 / .1);--terracotta-bg: oklch(54% .14 45 / .1);--amber-bg: oklch(62% .12 55 / .1);--sky-bg: oklch(54% .14 45 / .1);--xiaohei-fill: oklch(22% .012 60);--r-sm: 6px;--r-md: 10px;--r-lg: 14px;--r-xl: 18px;--r-pill: 999px;--shadow-card: 0 1px 2px oklch(22% .012 60 / .06), 0 4px 16px oklch(22% .012 60 / .04);--shadow-card-hover: 0 2px 4px oklch(22% .012 60 / .08), 0 8px 24px oklch(22% .012 60 / .06);--ease-snap: cubic-bezier(.22, 1, .36, 1);--read-line: 1.78;--read-line-tight: 1.55;--read-gap: 1.15em;--space-section: 4.5rem;--space-block: 1.5rem;--space-heading-after: 1.35rem;--page-gutter: clamp(16px, 4vw, 28px);--font-display: "Inter", -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}@media (prefers-color-scheme: dark){:root{--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(62% .14 45);--accent-deep: oklch(55% .14 45);--accent-cyan: oklch(62% .14 45);--accent-coral: oklch(62% .14 45);--on-accent: oklch(17% .008 60);--hl-pear: oklch(62% .14 45 / .42);--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-bg: oklch(62% .14 45 / .12);--terracotta-bg: oklch(62% .14 45 / .12);--xiaohei-fill: oklch(96% .006 85);--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:smooth;overflow-x:clip;-webkit-text-size-adjust:100%;text-size-adjust:100%}body{font-family:var(--font-body);background:var(--bg-0);color:var(--fg-0);line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:clip}::selection{background:var(--accent);color:var(--on-accent)}*{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: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))}.container-narrow{max-width:52rem;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) and (max-width: 1339px){.container-narrow{margin-left:auto;margin-right:auto;max-width:min(52rem,calc(100% - 48px))}}@media (min-width: 1340px){.container-narrow{margin-left:max(288px,calc(50% - 26rem));margin-right:auto}}h1{font-size:clamp(32px,5vw,48px);font-weight:700;line-height:1.2;letter-spacing:-.025em;font-style:normal;margin-bottom:var(--space-heading-after)}h2{font-size:clamp(24px,3.4vw,32px);font-weight:700;line-height:1.3;letter-spacing:-.02em;font-style:normal;margin-bottom:calc(var(--space-heading-after) * .85)}h3{font-size:clamp(17px,2.4vw,19px);font-weight:600;font-style:normal;margin-bottom:.65em;line-height:1.4}.subhead{font-size:clamp(16px,2.2vw,17px);color:var(--fg-1);line-height:var(--read-line)}.footnote{font-size:13px;color:var(--fg-2)}.footnote.source-note,.source-note{margin-top:14px;padding:12px 16px 12px 15px;line-height:1.72;color:var(--fg-2);background:var(--bg-inset);border:1px solid var(--hairline);border-left:3px solid var(--terracotta);border-radius:0 var(--r-md) var(--r-md) 0}.source-note a{color:var(--fg-1);font-weight:500;text-decoration:none;border-bottom:1px solid var(--hairline-strong);transition:color .15s ease,border-color .15s ease}.source-note a:hover{color:var(--accent);border-bottom-color:var(--accent)}.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{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));height:60px;display:flex;align-items:center;gap:22px}.brand{display:flex;align-items:center;gap:10px;margin-right:auto;font-weight:700;font-size:17px;color:var(--fg-0);text-decoration:none}.brand-dot{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;gap:22px;align-items:center}.nav-links a{font-size:15px;font-weight:500;color:var(--fg-1);text-decoration:none;transition:color .15s ease}.nav-links a:hover{color:var(--sky)}.nav-actions{display:flex;align-items:center;gap:16px}.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}.nav-lang:hover{color:var(--fg-0);border-color:var(--sky);background:var(--sky-bg)}.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)}.nav-backdrop{display:none}@media (max-width: 700px){.nav-burger{display:inline-flex}.nav-backdrop{display:block;position:fixed;top:60px;right:0;bottom:0;left:0;z-index:40;border:none;padding:0;margin:0;background:#1f191552;cursor:pointer;-webkit-tap-highlight-color:transparent}.nav-links{position:absolute;top:60px;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:14px 2px;border-bottom:1px solid var(--hairline)}.nav-links a:last-child{border-bottom:none}}@media (prefers-color-scheme: dark){@media (max-width: 700px){.nav-backdrop{background:#00000085}.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:2px solid oklch(54% .14 45 / .45);outline-offset:2px}.btn-primary{background:var(--accent);color:var(--on-accent);box-shadow:none}.btn-primary:hover{background:var(--accent-deep);transform:none;box-shadow:none}.btn-primary:active{transform:scale(.98);box-shadow:none;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:none}.btn-glass:hover{border-color:var(--hairline-strong);background:var(--bg-inset);transform:none}.btn-glass:active{transform:scale(.98)}@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 ease}.card:hover{transform:none;box-shadow:var(--shadow-card-hover);border-color:var(--hairline-strong)}.card-pad{padding:24px}@media (prefers-reduced-motion: reduce){.card,.card:hover{transform:none;transition:border-color .15s ease}}.pill{display:inline-flex;align-items:center;gap:5px;padding:2px 10px;border-radius:var(--r-pill);font-size:12px;font-weight:600;line-height:1.7;white-space:nowrap}.pill-sky{color:var(--sky);background:var(--sky-bg)}.pill-terracotta{color:var(--terracotta);background:var(--terracotta-bg)}.pill-amber{color:var(--amber);background:var(--amber-bg)}.pill-sage{color:var(--sage);background:var(--sage-bg)}.pill-ink{color:var(--fg-1);background:var(--bg-inset)}.dots{display:inline-flex;gap:4px;align-items:center}.dot{width:7px;height:7px;border-radius:50%;background:var(--hairline-strong)}.dot.on{background:var(--accent-cyan)}.row-list{display:flex;flex-direction:column}.row-list>*+*{border-top:1px solid var(--hairline)}.example{background:var(--bg-inset);border-radius:var(--r-md);padding:14px 18px}.example .en{font-size:17px;font-weight:500}.example .zh{font-size:14px;color:var(--fg-1);margin-top:2px}.example .en .hl{font-weight:700;background-size:100% .28em}.wrong-right{display:flex;flex-direction:column;gap:8px}.wr-line{display:flex;gap:10px;align-items:baseline;font-size:16px}.wr-mark{font-weight:700;flex:none;width:1.4em;text-align:center}.wr-line.bad .wr-mark{color:var(--terracotta)}.wr-line.good .wr-mark{color:var(--sage)}.wr-line.bad .wr-text{color:var(--fg-1);text-decoration:line-through;text-decoration-color:var(--terracotta);text-decoration-thickness:1.5px}.wr-line.good .wr-text{font-weight:600}.xiaohei-mark{display:inline-flex;vertical-align:middle;transition:transform .52s var(--ease-snap)}.xiaohei-mark--bounce{transform:translateY(-4px) scale(1.04)}@media (prefers-reduced-motion: reduce){.xiaohei-mark,.xiaohei-mark--bounce{transform:none;transition:none}}footer{border-top:1px solid var(--hairline);margin-top:80px;padding:28px 0 calc(40px + env(safe-area-inset-bottom,0));color:var(--fg-2);font-size:13px;background:var(--bg-0)}footer .container{display:flex;justify-content:center;gap:16px;flex-wrap:wrap;text-align:center}#root{min-height:100%}@media (max-width: 767px){:root{--space-section: 3.25rem;--space-heading-after: 1.1rem;--page-gutter: clamp(48px, 12vw, 72px)}.nav-inner{gap:12px}.nav-links.open{padding-top:8px;padding-bottom:16px;padding-left:calc(var(--page-gutter) + env(safe-area-inset-left,0px));padding-right:calc(var(--page-gutter) + env(safe-area-inset-right,0px))}}@media (max-width: 480px){:root{--page-gutter: clamp(52px, 13vw, 76px)}}@media (min-width: 768px) and (max-width: 1024px){:root{--space-section: 4rem}.container{max-width:920px}}.container-narrow .card:not(.demo):hover{transform:none;box-shadow:var(--shadow-card);border-color:var(--hairline)}.lesson-hero{padding:clamp(36px,7vw,56px) 0 24px;margin-bottom:1.5rem}.crumb{display:flex;gap:8px;align-items:center;font-size:12px;font-family:var(--font-mono);color:var(--fg-2);margin-bottom:1.5rem;flex-wrap:wrap;letter-spacing:.04em}.crumb a{color:var(--fg-2);text-decoration:none;transition:color .15s ease}.crumb a:hover{color:var(--sky)}.lesson-hero h1{font-size:clamp(1.65rem,4.5vw,2.45rem);line-height:1.28;letter-spacing:-.02em;margin-bottom:.35em}.lesson-hero .subhead{margin-top:1.25rem;font-size:clamp(1rem,2.4vw,1.08rem);line-height:var(--read-line);color:var(--fg-1);max-width:44em}.lesson-hero .meta{display:flex;gap:10px;margin-top:1.75rem;flex-wrap:wrap;align-items:center;padding:14px 18px;background:var(--bg-inset);border:1px solid var(--hairline);border-radius:var(--r-lg);width:fit-content;max-width:100%}.lesson-loading{display:flex;align-items:center;gap:12px;margin-top:32px;padding:20px 22px;border:1px solid var(--hairline);border-radius:var(--r-md);background:var(--bg-card);color:var(--fg-1);font-size:14px}.lesson-loading-spinner{width:18px;height:18px;flex:none;border:2px solid var(--hairline-strong);border-top-color:var(--accent);border-radius:50%;animation:lesson-spin .7s linear infinite}@keyframes lesson-spin{to{transform:rotate(360deg)}}@media (prefers-reduced-motion: reduce){.lesson-loading-spinner{animation:none;border-top-color:var(--hairline-strong)}}.lsec{margin-top:var(--space-section)}.lsec:first-of-type{margin-top:2rem}.lsec>h2{font-size:clamp(1.12rem,2.6vw,1.28rem);font-weight:600;margin-bottom:1.25rem;padding-bottom:14px;margin-top:.25rem;border-bottom:1px dashed var(--hairline);display:flex;align-items:center;gap:10px;line-height:1.45;letter-spacing:-.01em}.lsec>.lead{font-size:1rem;color:var(--fg-1);margin-bottom:1.75rem;line-height:var(--read-line);max-width:46em}.goals{background:linear-gradient(165deg,var(--bg-inset) 0%,var(--bg-card) 100%);border-color:var(--hairline-strong)}.goals{padding:26px 28px;display:flex;flex-direction:column;gap:14px}.goal-item{display:flex;gap:12px;font-size:.98rem;line-height:var(--read-line);align-items:flex-start}.goal-item .tick{color:var(--sage);font-weight:700;flex:none;margin-top:.15em;font-size:1.05em}.contrast{display:grid;grid-template-columns:1fr 1fr;gap:18px}.contrast-card{padding:26px 28px}.contrast-card .tag{margin-bottom:14px}.contrast-card .big{font-size:1.2rem;font-weight:600;line-height:var(--read-line-tight)}.contrast-card .big .gap{color:var(--terracotta);font-weight:700}.contrast-card .big .hl{background-image:linear-gradient(var(--hl-pear) 0 0);background-repeat:no-repeat;background-size:100% .32em;background-position:0 82%;border-bottom:none}.contrast-card .note{font-size:.92rem;color:var(--fg-1);margin-top:14px;line-height:var(--read-line)}table.match{width:100%;border-collapse:collapse;font-size:.95rem}table.match th,table.match td{text-align:left;padding:14px 20px;border-top:1px solid var(--hairline);line-height:var(--read-line-tight)}table.match thead th{border-top:none;font-size:12px;font-weight:600;color:var(--fg-2);font-family:var(--font-mono);letter-spacing:.06em;text-transform:uppercase}table.match td.be{font-weight:600;font-size:1.05rem}table.match td.ex{color:var(--fg-1)}.use-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.use-grid.cols-2{grid-template-columns:repeat(2,1fr)}.use-grid.cols-4{grid-template-columns:repeat(4,1fr)}.use-card{padding:22px 24px}.use-card .label{font-size:11px;font-weight:600;font-family:var(--font-mono);color:var(--fg-2);margin-bottom:10px;letter-spacing:.06em}.use-card .en{font-size:1.05rem;font-weight:600;line-height:var(--read-line-tight)}.use-card .en b{background-image:linear-gradient(var(--hl-pear) 0 0);background-repeat:no-repeat;background-size:100% .28em;background-position:0 82%;border-bottom:none}.use-card .zh{font-size:.9rem;color:var(--fg-1);margin-top:8px;line-height:var(--read-line)}.example+.example{margin-top:14px}.example{line-height:var(--read-line)}.alert-card{border-left:4px solid var(--terracotta);background:var(--terracotta-bg)}.alert-item{padding:22px 26px;line-height:var(--read-line)}.alert-item .why{font-size:.92rem;color:var(--fg-1);margin-top:10px}.alert-item .why b{color:var(--fg-0)}.quiz{padding:8px 0}.quiz-item{padding:20px 26px}.quiz-item+.quiz-item{border-top:1px solid var(--hairline)}.quiz-item .q{font-size:1rem;font-weight:500;line-height:var(--read-line)}.quiz-item .q .blank{display:inline-block;min-width:64px;border-bottom:2px dashed var(--hairline-strong);text-align:center;color:var(--fg-2)}.quiz-item details{margin-top:12px}.quiz-item summary{font-size:13px;font-weight:600;color:var(--sky);cursor:pointer;list-style:none;padding:4px 0}.quiz-item summary:before{content:"▸ "}.quiz-item details[open] summary:before{content:"▾ "}.quiz-item .ans{font-size:.95rem;margin-top:10px;padding:14px 18px;background:var(--bg-inset);border-radius:var(--r-md);line-height:var(--read-line);border:1px solid var(--hairline)}.quiz-item .ans b{color:var(--sage)}.pager{display:flex;gap:16px;margin-top:4rem;padding-top:8px}.pager a{flex:1;min-width:0;padding:22px 26px;text-decoration:none;color:inherit;transition:transform .22s var(--ease-snap),border-color .15s ease,box-shadow .22s var(--ease-snap)}.pager a:hover{border-color:var(--sky);transform:translateY(-2px);box-shadow:var(--shadow-card-hover)}.pager .dir{font-size:12px;font-family:var(--font-mono);color:var(--fg-2);letter-spacing:.04em}.pager .name{display:grid;gap:8px;margin-top:12px}.pager-no{display:block;font-size:1.5rem;line-height:1;font-weight:700;color:var(--fg-0);font-variant-numeric:tabular-nums}.pager-title{display:block;min-width:0;font-size:.95rem;line-height:var(--read-line-tight);font-weight:600;color:var(--fg-0);overflow-wrap:anywhere}.pager .next{text-align:right}.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:24px 22px}.demo-head{padding:16px 22px}.demo-side{padding:22px 24px}.lesson-illus{margin-inline:0}.pager{flex-direction:column;margin-top:3rem}.pager .next{text-align:left}.lesson-hero .meta{width:100%;box-sizing:border-box}.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}.demo-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;padding:16px 24px;border-bottom:1px solid var(--hairline);flex-wrap:wrap;background:var(--bg-inset)}.demo-head .demo-title{font-size:.9rem;font-weight:600;line-height:var(--read-line-tight)}.demo-head .demo-hint{font-size:12px;color:var(--fg-2)}.demo-body{display:grid;grid-template-columns:1.1fr 1fr}.demo-stage{padding:24px;display:flex;align-items:center;justify-content:center;min-height:300px;background:var(--bg-lift)}.demo-stage svg,.demo-stage canvas{max-width:100%;height:auto;display:block}.demo-side{border-left:1px solid var(--hairline);padding:26px 28px;line-height:var(--read-line)}.demo-side h4{font-size:1.05rem;font-weight:600;display:flex;align-items:center;gap:8px;line-height:var(--read-line-tight)}.demo-side .period{font-size:12px;color:var(--fg-2);margin-top:4px}.demo-side p{font-size:.92rem;color:var(--fg-1);margin-top:12px}.demo-side .tags{display:flex;gap:8px;flex-wrap:wrap;margin-top:14px}.chips{display:flex;gap:10px;flex-wrap:wrap}.chip{font-family:inherit;font-size:13px;font-weight:600;padding:8px 16px;border-radius:var(--r-pill);cursor:pointer;color:var(--fg-1);background:var(--glass);border:1px solid var(--hairline-strong);transition:border-color .15s ease,background .15s ease,color .15s ease,transform .14s ease}.chip:hover{border-color:var(--sky);transform:translateY(-1px)}.chip.active{background:var(--accent);color:var(--on-accent);border-color:var(--accent)}.slider-row{display:flex;align-items:center;gap:16px;padding:12px 0}.slider-row label{font-size:13px;font-weight:600;color:var(--fg-1);min-width:88px}.slider-row input[type=range]{flex:1;accent-color:var(--amber)}.slider-row .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;cursor:pointer;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:border-color .15s ease,transform .18s ease,box-shadow .18s ease}.flip-card:hover{border-color:var(--sky);transform:translateY(-2px);box-shadow:var(--shadow-card-hover)}.flip-card:active{transform:scale(.98)}.flip-card .fc-q{font-size:.95rem;font-weight:600;line-height:var(--read-line-tight)}.flip-card .fc-tap{font-size:12px;color:var(--sky);margin-top:12px;font-weight:600}.flip-card .fc-a{display:none;margin-top:12px}.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)}.flip-card.revealed .fc-a{display:block}.flip-card.revealed .fc-tap{display:none}@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{transform:none}}pre.code{margin:0;padding:16px 20px;overflow-x:auto;background:var(--bg-inset);border:1px solid var(--hairline);border-radius:var(--r-md);font-size:13px;line-height:1.85}pre.code code{font-family:ui-monospace,SF Mono,Menlo,Consolas,Liberation Mono,monospace;color:var(--fg-0);white-space:pre}pre.code .cm{color:var(--fg-2)}pre.code .str{color:var(--sage)}.demo pre.code{border:none;border-radius:0}.seg{margin-top:32px}.seg h3{font-size:17px;margin-bottom:10px;display:flex;align-items:center;gap:10px}.seg .num{flex:none;width:24px;height:24px;border-radius:50%;background:var(--accent);color:var(--on-accent);font-size:13px;font-weight:700;display:inline-flex;align-items:center;justify-content:center}.seg p{font-size:15px;color:var(--fg-1);margin-top:10px}.seg p b{color:var(--fg-0)}.demo-pad{padding:18px 22px}.term-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}.term-label{font-size:12px;font-weight:600;color:var(--fg-2);margin-bottom:6px}.term{min-height:120px;padding:12px 14px;background:var(--bg-inset);border:1px solid var(--hairline);border-radius:var(--r-md);font-family:ui-monospace,Menlo,Consolas,monospace;font-size:12.5px;line-height:1.75;color:var(--fg-0);white-space:pre-wrap}.term-stat{font-size:12px;color:var(--fg-2);margin-top:6px;min-height:18px}.term-stat b{color:var(--fg-0)}.l26-formula{padding:14px 20px;font-size:15px;font-weight:600;text-align:center}.cost-stats{font-size:14px;margin-top:14px}.cost-stats>div{display:flex;justify-content:space-between;gap:12px;padding:7px 0;border-top:1px dashed var(--hairline)}.cost-stats b{font-variant-numeric:tabular-nums}#mem-svg .pulse{animation:memPulse .7s ease}@keyframes memPulse{0%,to{opacity:1}50%{opacity:.15}}@media (prefers-reduced-motion: reduce){#mem-svg .pulse{animation:none}}.stat-pills{display:flex;gap:6px;flex-wrap:wrap;margin-top:14px}@media (max-width: 700px){.term-grid{grid-template-columns:1fr}}.opt-label{font-size:12px;font-weight:600;color:var(--fg-2);margin:14px 0 8px}.opt-label:first-child{margin-top:0}#calc-needle{transition:transform .35s ease}@media (prefers-reduced-motion: reduce){#calc-needle{transition:none}}#pl-svg .pl-node{cursor:pointer}#pl-svg .pl-node rect{fill:var(--glass);stroke:var(--hairline-strong);stroke-width:1;transition:fill .2s ease,stroke .2s ease}#pl-svg .pl-node text{fill:var(--fg-1);pointer-events:none}#pl-svg .pl-node.done rect{fill:var(--sky-bg);stroke:var(--sky)}#pl-svg .pl-node.done text{fill:var(--fg-0)}#pl-svg .pl-node.cur rect{fill:var(--amber-bg);stroke:var(--amber);stroke-width:2}#pl-svg .pl-node.cur text{fill:var(--fg-0);font-weight:700}#pl-svg .pl-arrow path{stroke:var(--hairline-strong);fill:none;stroke-width:1.5;transition:stroke .2s ease}#pl-svg .pl-arrow polygon{fill:var(--hairline-strong);transition:fill .2s ease}#pl-svg .pl-arrow.on path{stroke:var(--sky)}#pl-svg .pl-arrow.on polygon{fill:var(--sky)}@media (prefers-reduced-motion: reduce){#pl-svg .pl-node rect,#pl-svg .pl-arrow path,#pl-svg .pl-arrow polygon{transition:none}}.hexa{margin-top:12px;padding:8px 12px;font-size:13px;line-height:1.7;color:var(--fg-1);background:var(--bg-inset);border-left:3px solid var(--terracotta);border-radius:0 var(--r-sm) var(--r-sm) 0}.hexa b{color:var(--fg-0)}.pi-chat{display:flex;flex-direction:column;gap:10px;width:100%;max-width:440px}.pi-bub{display:none;padding:10px 14px;max-width:94%;border:1px solid var(--hairline-strong);border-radius:var(--r-md);background:var(--glass);font-size:13.5px;line-height:1.65}.pi-bub.on{display:block;animation:pi-in .28s ease}@keyframes pi-in{0%{opacity:0;transform:translateY(6px)}}.pi-bub .who{display:block;font-size:11px;font-weight:700;letter-spacing:.04em;color:var(--fg-2);margin-bottom:3px}.pi-user{align-self:flex-end;background:var(--sky-bg);border-color:var(--sky)}.pi-web{background:var(--amber-bg);border-color:var(--amber);border-style:dashed}.pi-tool{background:var(--bg-inset);font-family:ui-monospace,SF Mono,Menlo,Consolas,monospace;font-size:12.5px}.pi-bad{background:var(--terracotta-bg);border-color:var(--terracotta)}.pi-good{background:var(--sage-bg);border-color:var(--sage)}.pi-evil{color:var(--terracotta);font-weight:600}.pi-data-tag{display:inline-block;font-size:11px;font-weight:700;color:var(--sage);border:1px solid var(--sage);border-radius:var(--r-pill);padding:0 8px;margin-bottom:4px}.l29-flip-grid{grid-template-columns:repeat(2,1fr)}@media (max-width: 700px){.l29-flip-grid{grid-template-columns:1fr}}@media (prefers-reduced-motion: reduce){.pi-bub.on{animation:none}}.map-node{cursor:pointer}.map-node .c{fill:var(--bg-card);stroke:var(--fg-2);stroke-width:1.5;transition:fill .2s ease,stroke .2s ease}.map-node .hit{fill:transparent;stroke:none}.map-node text{pointer-events:none}.map-node .num{font-weight:700;fill:var(--fg-1)}.map-node .lbl{font-weight:700}.map-node.todo{opacity:.55}.map-node.done .c{fill:var(--sage);stroke:var(--sage)}.map-node.active .c{fill:var(--accent);stroke:var(--accent)}.map-node.done .num,.map-node.active .num{fill:var(--on-accent)}#trail-progress{transition:stroke-dashoffset .7s ease}#summit{cursor:pointer}#summit text{pointer-events:none}#summit .pole{stroke:var(--fg-2);transition:stroke .2s ease}#summit.active .pole{stroke:var(--fg-0)}.recap{font-size:17px;line-height:2}.recap b{border-bottom:2px solid var(--sage)}.recap .ln{font-size:12px;color:var(--fg-2)}#routes .use-card{cursor:pointer;transition:opacity .2s ease,border-color .2s ease}#routes .use-card.dim{opacity:.45}#routes .use-card.lit{border-color:var(--sage)}.acts{list-style:none;margin:10px 0 0;padding:0}.acts li{position:relative;padding-left:20px;margin-top:8px;font-size:14px;color:var(--fg-1)}.acts li:before{content:"→";position:absolute;left:0;color:var(--sage);font-weight:700}#route-hint{margin-top:14px;font-size:14px;color:var(--fg-1)}#route-hint b{color:var(--sage)}@media (prefers-reduced-motion: reduce){#trail-progress,.map-node .c,#routes .use-card{transition:none!important}}.lesson-toc{position:fixed;top:60px;left:0;bottom:0;width:272px;z-index:40;display:flex;flex-direction:column;padding:12px 14px 48px;overflow-y:auto;background:var(--bg-0);border-right:1px solid var(--hairline)}.toc-head{font-size:11px;font-weight:600;font-family:var(--font-mono);letter-spacing:.1em;text-transform:uppercase;color:var(--fg-2);padding:14px 12px 12px;border-bottom:1px dashed var(--hairline);display:flex;align-items:center;justify-content:space-between}.toc-close{display:none}.toc-stage{margin-top:18px}.toc-stage-title{font-size:11px;font-weight:600;font-family:var(--font-mono);color:var(--fg-2);padding:6px 12px 8px;letter-spacing:.05em}.lesson-toc ul{list-style:none;margin:0;padding:0}.toc-item{display:flex;gap:10px;align-items:baseline;padding:9px 12px;border-radius:var(--r-md);font-size:13px;line-height:1.45;color:var(--fg-1);text-decoration:none;transition:background .15s ease,color .15s ease,transform .14s ease}.toc-item:hover{background:var(--sky-bg);color:var(--fg-0);transform:translate(2px)}.toc-item.active{background:var(--accent);color:var(--on-accent);font-weight:600}.toc-no{flex:none;font-size:11px;font-weight:600;font-variant-numeric:tabular-nums;color:var(--fg-2)}.toc-item:hover .toc-no{color:var(--fg-1)}.toc-item.active .toc-no{color:var(--on-accent)}.toc-fab,.toc-backdrop{display:none}@media (max-width: 1339px){.lesson-toc{transform:translate(-100%);transition:transform .28s cubic-bezier(.4,0,.2,1);width:min(300px,86vw);top:0;z-index:90;box-shadow:0 0 40px #0000002e}.lesson-toc.open{transform:translate(0)}.toc-close{display:inline-flex;align-items:center;justify-content:center;width:30px;height:30px;margin:-6px -4px -6px 0;padding:0;border:none;background:none;color:var(--fg-1);cursor:pointer;border-radius:var(--r-sm)}.toc-close:hover{background:var(--bg-inset);color:var(--fg-0)}.toc-backdrop{display:block;position:fixed;top:0;right:0;bottom:0;left:0;z-index:80;background:#0006;opacity:0;pointer-events:none;transition:opacity .28s ease}.toc-backdrop.show{opacity:1;pointer-events:auto}.toc-fab{display:inline-flex;align-items:center;gap:7px;position:fixed;z-index:70;right:max(16px,env(safe-area-inset-right,16px));bottom:max(18px,env(safe-area-inset-bottom,18px));height:46px;padding:0 18px 0 16px;border:none;cursor:pointer;border-radius:var(--r-pill);background:var(--accent);color:var(--on-accent);font-size:15px;font-weight:600;box-shadow:0 6px 20px #00000038;transition:transform .18s ease}.toc-fab:active{transform:scale(.96)}}@media (prefers-color-scheme: dark){.toc-fab{background:#2c2c30;color:var(--fg-0);border:1px solid rgba(255,255,255,.2);box-shadow:0 8px 24px #0000008c}}.hero{padding:clamp(40px,8vw,56px) 0 clamp(48px,8vw,72px)}@media (max-width: 767px){.hero{padding-top:clamp(32px,7vw,48px);padding-bottom:clamp(40px,8vw,56px)}}.hero-split{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.05fr);gap:clamp(28px,5vw,40px);align-items:start}.hero-copy{text-align:left;min-width:0}.hero-copy .eyebrow{margin-bottom:1rem;gap:10px}.hero-copy h1{max-width:14ch;margin-bottom:.2em}.hero-copy .subhead{max-width:36ch;margin-top:1.25rem}.hero-cta{display:flex;gap:12px;margin-top:2rem;flex-wrap:wrap}.hero-art{display:flex;flex-direction:column;gap:16px;min-width:0;width:100%;max-width:100%}.hero-illustration{padding:0;overflow:hidden;border:1px solid var(--hairline);border-radius:var(--r-lg);width:100%}.hero-illustration img{display:block;width:100%;max-width:100%;height:auto;object-fit:contain;background:var(--bg-card)}.hero-illustration figcaption{padding:10px 16px 12px;text-align:left}.hero-viz{overflow:hidden}.hero-viz .viz-caption{font-size:13px;color:var(--fg-2);padding:0 16px 14px;text-align:left}.viz-caption .lh-cap-alt{color:var(--amber);font-weight:600}.viz-caption .lh-cap-wild{color:var(--terracotta);font-weight:600}.llm-hero{position:relative;padding:18px 22px 20px;text-align:left}.lh-arcs{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%;pointer-events:none;z-index:1}.lh-arcs path{fill:none;stroke:var(--amber);stroke-width:1.5;stroke-dasharray:4 4;animation:lhDash .8s linear infinite}@keyframes lhDash{to{stroke-dashoffset:-8}}.lh-status{display:flex;align-items:center;gap:8px;font-size:12px;font-weight:600;color:var(--fg-2);letter-spacing:.02em}.lh-dot{width:7px;height:7px;border-radius:50%;background:var(--amber);animation:lhPulse 1.1s ease infinite}.lh-dot.ok{background:var(--sage);animation:none}@keyframes lhPulse{0%,to{opacity:1}50%{opacity:.25}}.lh-status-r{margin-left:auto;font-weight:500}.lh-main{display:flex;gap:26px;margin-top:16px;align-items:stretch}.lh-text{flex:1;min-width:0;font-size:31px;font-weight:700;line-height:1.75;letter-spacing:.04em;align-self:center}.lh-ch{border-radius:6px;padding:1px 1px 3px;transition:background-color .3s ease;animation:lhPop .26s ease}.lh-ch.alt{color:var(--amber)}.lh-ch.wild{color:var(--terracotta)}@keyframes lhPop{0%{opacity:0;transform:translateY(8px)}}.lh-cursor{display:inline-block;width:.62em;height:1.05em;margin-left:3px;vertical-align:-.12em;border-radius:3px;background:var(--amber);animation:lhBlink .9s steps(2) infinite}@keyframes lhBlink{50%{opacity:.12}}.lh-end{color:var(--sage);margin-left:6px}.lh-side{flex:none;width:256px}.lh-side-label{font-size:11px;font-weight:700;letter-spacing:.06em;color:var(--fg-2);margin-bottom:8px}.lh-cand{display:flex;align-items:center;gap:8px;padding:3px 0;transition:opacity .25s ease}.lh-cand.lose{opacity:.3}.lh-cand.win .lh-cand-ch{background:var(--amber);color:var(--on-accent);border-color:var(--amber)}.lh-cand-ch{flex:none;width:26px;height:26px;display:inline-flex;align-items:center;justify-content:center;font-size:14px;font-weight:700;border:1px solid var(--hairline-strong);border-radius:7px;background:var(--bg-inset);transition:background .2s ease,color .2s ease}.lh-cand-ch.wild{color:var(--terracotta)}.lh-bar{flex:1;height:8px;border-radius:99px;background:var(--bg-inset);overflow:hidden}.lh-bar-fill{display:block;height:100%;border-radius:99px;background:var(--fg-2);transition:width .3s ease}.lh-bar-fill.top{background:var(--amber)}.lh-bar-fill.wild{background:var(--terracotta)}.lh-pct{flex:none;width:38px;font-size:11.5px;font-variant-numeric:tabular-nums;color:var(--fg-2);text-align:right}.lh-temp{margin-top:16px;padding-top:14px;border-top:1px dashed var(--hairline)}.lh-temp label{display:flex;align-items:center;gap:6px;font-size:12px;color:var(--fg-2)}.lh-temp label b{color:var(--fg-0);font-variant-numeric:tabular-nums}.lh-zone{margin-left:auto;font-size:11px;font-weight:700;padding:1px 8px;border-radius:99px;background:var(--bg-inset);color:var(--fg-1)}.lh-zone.hot{background:var(--terracotta-bg);color:var(--terracotta)}.lh-temp input[type=range]{width:100%;margin-top:8px;accent-color:var(--amber);cursor:pointer}.lh-temp-hint{margin-top:6px;font-size:11px;color:var(--fg-2)}@media (max-width: 700px){.lh-main{flex-direction:column;gap:18px}.lh-text{font-size:clamp(20px,5.4vw,25px);min-height:92px;letter-spacing:.02em;overflow-wrap:anywhere}.lh-side{width:100%;max-width:100%}.llm-hero{padding:20px 22px;overflow:hidden}.hero-illustration figcaption,.hero-viz .viz-caption{padding-inline:22px}}@media (prefers-reduced-motion: reduce){.lh-arcs path,.lh-dot,.lh-cursor{animation:none}.lh-ch,.lh-bar-fill,.lh-cand{animation:none;transition:none}}.stats{display:flex;gap:0;margin-top:28px;border:1px solid var(--hairline);border-radius:var(--r-lg);background:var(--bg-card);box-shadow:var(--shadow-card);overflow:hidden}.stat{flex:1;padding:16px 10px;text-align:left}.stat+.stat{border-left:1px solid var(--hairline)}.stat .num{font-size:clamp(1.5rem,2vw + .5rem,2rem);font-weight:700;letter-spacing:-.025em;font-variant-numeric:tabular-nums}.stat .lbl{font-size:12px;color:var(--fg-2);margin-top:4px;font-family:var(--font-mono);letter-spacing:.04em}.section{padding:clamp(48px,9vw,72px) 0 0}.section-head{margin-bottom:clamp(2rem,5vw,2.75rem)}.section-head .eyebrow{margin-bottom:.75rem}.section-head h2{margin-top:.5rem}.section-head .subhead{margin-top:1rem;line-height:1.75;max-width:36em}#idea{margin-top:clamp(40px,8vw,56px);padding-bottom:clamp(48px,8vw,72px)}.idea-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.idea-card{padding:0 0 26px;overflow:hidden;background:var(--bg-card);border:1px solid var(--hairline)}.idea-card .xiaohei-scene--compact{margin:0;border-bottom:1px solid var(--hairline)}.idea-card .idea-tag{padding:18px 26px 0}.idea-card h3{padding:0 26px;margin-bottom:8px}.idea-card p{padding:0 26px;font-size:14px;color:var(--fg-1);line-height:1.75}.xiaohei-scene{margin:0;border:1px solid var(--hairline);border-radius:var(--r-md);overflow:hidden;background:var(--bg-card)}.xiaohei-scene svg{display:block;width:100%;height:auto;aspect-ratio:280 / 130;object-fit:contain;background:var(--bg-card)}.xiaohei-scene figcaption{padding:8px 14px 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}.lesson-illus{margin:0 0 1.25rem;border:1px solid var(--hairline);border-radius:var(--r-md);overflow:hidden;background:var(--bg-card)}.lesson-illus img{display:block;width:100%;height:auto;aspect-ratio:3 / 2;object-fit:contain;background:var(--bg-card)}.lesson-illus figcaption{padding:8px 14px 10px;border-top:1px solid var(--hairline);text-align:left}.idea-card--0,.idea-card--1,.idea-card--2{background:var(--bg-card);border-color:var(--hairline)}.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}.stage{margin-bottom:clamp(2.5rem,6vw,3rem)}.stage-head{display:flex;align-items:baseline;gap:12px 18px;margin-bottom:1.25rem;flex-wrap:wrap}.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-head h3{font-size:clamp(1.15rem,2.8vw,1.375rem);font-weight:700;letter-spacing:-.01em;margin-top:.25rem;line-height:1.35}.stage-head .goal{font-size:14px;color:var(--fg-1);flex-basis:100%;margin-top:.35rem;line-height:1.65}.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}a.lesson:hover{background:var(--bg-inset)}.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}.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:border-color .15s ease,background .15s ease}.usage-step:hover{border-color:var(--hairline-strong);background:var(--bg-inset);transform:none;box-shadow:none}.usage-step b{font-weight:700;color:var(--accent)}.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: 760px){.idea-grid,.section-head--split{grid-template-columns:1fr}.section-scene{max-width:100%;width:100%}.lesson{grid-template-columns:36px 1fr}.lesson-meta{grid-column:2;justify-self:start;margin-top:4px}.stats{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));width:100%}.stat{flex:unset;text-align:center;padding:20px 16px}.stat+.stat{border-left:none}.stat:nth-child(odd){border-right:1px solid var(--hairline)}.stat:nth-child(n+3){border-top:1px solid var(--hairline)}}@media (max-width: 520px){.hero-cta{flex-direction:column;align-items:stretch;gap:10px}.hero-cta .btn{width:100%;height:48px}}@media (min-width: 521px) and (max-width: 760px){.hero-cta .btn{flex:1 1 0;min-width:0;padding-inline:14px;font-size:15px;height:48px}}.venn-ring{cursor:pointer}.venn-ring circle{transition:fill-opacity .2s ease,stroke-width .2s ease}.venn-ring text{font-weight:700;pointer-events:none}.venn-ring .sub{font-weight:500;font-size:11px}.venn-ring.dim circle{fill-opacity:.3}.venn-ring.active circle{fill-opacity:.72;stroke-width:2.5}.bridge-flow{display:flex;flex-wrap:wrap;align-items:center;gap:8px 10px;margin-top:18px}.bridge-flow-item{display:inline-flex;align-items:center;gap:10px;min-width:0}.bridge-flow-step{display:inline-flex;align-items:center;gap:8px;min-height:40px;padding:8px 14px;border-radius:var(--r-sm);background:var(--bg-inset);border:1px solid var(--hairline);color:var(--fg-1);font-size:14px;font-weight:600;line-height:1.35}.bridge-flow-step b{color:var(--fg-0);font-variant-numeric:tabular-nums}.bridge-flow-arrow{color:var(--fg-2);font-weight:700}@media (max-width: 640px){.bridge-flow{display:grid;gap:8px}.bridge-flow-item{display:grid;grid-template-columns:1fr;gap:6px}.bridge-flow-arrow{display:none}}.demo-body.single{grid-template-columns:1fr}#rule-flow-svg{width:100%;height:auto;display:block}#rule-flow-svg text{-webkit-user-select:none;user-select:none}.rule-flow-card{padding:16px 18px;overflow:hidden}#loop-svg .ln{cursor:pointer}#loop-svg .ln text{pointer-events:none}#loop-svg .ln.dim{opacity:.35}#loop-svg .ln.active rect{stroke-width:2.6px}.demo-foot{border-top:1px solid var(--hairline);padding:18px 22px 20px;display:grid;grid-template-columns:1fr 1.15fr;gap:22px}.demo-foot h4{font-size:16px;font-weight:700}.demo-foot .period{font-size:13px;color:var(--fg-2);margin-top:2px}.demo-foot p{font-size:14px;color:var(--fg-1);margin-top:8px}.loop-controls{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}.errbar{margin-top:16px}.errbar-top{display:flex;flex-wrap:wrap;gap:2px 10px;justify-content:space-between;align-items:baseline;font-size:13px;color:var(--fg-1);margin-bottom:6px}.errbar-top span{min-width:0}.errbar-top b{flex-shrink:0;color:var(--terracotta);font-variant-numeric:tabular-nums}.errbar-track{height:10px;border-radius:var(--r-pill);background:var(--bg-inset);border:1px solid var(--hairline);overflow:hidden}.errbar-fill{height:100%;background:var(--terracotta);border-radius:var(--r-pill)}.errbar.done .errbar-top b{color:var(--sage)}.errbar.done .errbar-fill{background:var(--sage)}#tok-stage-val{white-space:nowrap}@media (prefers-reduced-motion: no-preference){#loop-svg .ln{transition:opacity .25s ease}#loop-svg .ln rect{transition:stroke-width .2s ease}.errbar-fill{transition:width .45s ease,background .3s ease}#tok-svg rect.bar{transition:width .35s ease,fill .3s ease}#tok-note{transition:opacity .3s ease}}@media (max-width: 700px){.demo-foot{grid-template-columns:1fr}}#ladder-svg .lrow text{pointer-events:none}.qrow{margin-top:12px}.qrow .qlabel{font-size:13px;font-weight:600;color:var(--fg-1);margin-bottom:6px}.verdict{margin-top:18px;padding-top:14px;border-top:1px solid var(--hairline)}@media (prefers-reduced-motion: no-preference){#gauge-marker{transition:cx .35s ease}}.eco-node{cursor:pointer}.eco-node text{pointer-events:none}.eco-node rect{stroke-width:1.2}.eco-node:hover rect{stroke-width:2}.eco-node.sel rect{stroke-width:2.6}.wire{fill:none;stroke:var(--fg-2);stroke-width:1;opacity:.42}.wire.hot{stroke:var(--sage);stroke-width:2.2;opacity:1}.wire.dimmed{opacity:.08}#mcp-formula{font-variant-numeric:tabular-nums}#mcp-formula b{font-size:17px;color:var(--fg-0)}@media (prefers-reduced-motion: no-preference){.wire{transition:opacity .2s ease,stroke .2s ease,stroke-width .2s ease}.eco-node rect{transition:stroke-width .15s ease}}.rm-chat{width:100%;max-width:470px;display:flex;flex-direction:column;gap:12px}.rm-bubble{border-radius:var(--r-lg);padding:12px 16px;font-size:14px;line-height:1.6}.rm-user{background:var(--bg-inset);border:1px solid var(--hairline);align-self:flex-end;max-width:90%}.rm-ai{background:var(--glass);border:1px solid var(--hairline-strong)}.rm-role{font-size:12px;font-weight:700;color:var(--fg-2);margin-bottom:6px}.rm-draft{border-left:2px solid var(--hairline-strong);padding-left:12px;margin:4px 0 10px;display:flex;flex-direction:column;gap:7px}.rm-dline{font-size:13px;color:var(--fg-1);opacity:.16}.rm-dline.on{opacity:1}.rm-dline.now{color:var(--fg-0);font-weight:600}.rm-ans{font-size:15px;font-weight:700}.rm-ans .mark{margin-left:6px}.rm-ans.bad .mark{color:var(--terracotta)}.rm-ans.good .mark{color:var(--sage)}.rm-ans.rm-final-dim{opacity:.2}.rm-note{font-size:12.5px;color:var(--fg-2);margin-top:6px}.rm-stepnote{font-size:13px;color:var(--fg-1);background:var(--bg-inset);border-radius:var(--r-md);padding:10px 12px;margin-top:12px}@media (prefers-reduced-motion: no-preference){.rm-dline,.rm-ans{transition:opacity .25s ease,color .25s ease}}.mm-col{cursor:pointer}.mm-group,.mm-mtok,.mm-att{transition:opacity .22s ease}.mm-dim{opacity:.26}.mm-line{fill:none;stroke-dasharray:6 5}.mm-line.flowing{animation:mm-dash 1.1s linear infinite}@keyframes mm-dash{to{stroke-dashoffset:-22}}.vp-box{fill:var(--bg-inset);stroke:var(--hairline-strong)}@media (prefers-reduced-motion: reduce){.mm-line.flowing{animation:none}.mm-group,.mm-mtok,.mm-att{transition:none}}.dn-stage{display:flex;flex-direction:column;align-items:center;gap:10px;width:100%}.dn-frame{border:1px solid var(--hairline-strong);border-radius:var(--r-md);overflow:hidden;line-height:0;background:var(--bg-inset)}#dn-canvas{width:min(100%,300px);image-rendering:auto}.dn-caption{font-size:13px;color:var(--fg-2);font-variant-numeric:tabular-nums;font-weight:500}.dn-play{font-family:inherit;font-size:13px;font-weight:600;padding:8px 18px;border-radius:var(--r-pill);cursor:pointer;background:var(--accent);color:var(--on-accent);border:1px solid var(--accent)}.dn-play:hover{opacity:.88}.dn-phase{font-size:14px;color:var(--fg-1);margin-top:10px;min-height:44px}.demo-slim .demo-stage{min-height:220px}#cfg-canvas{width:min(100%,190px)}.steps3{display:flex;flex-direction:column}.steps3 .step{display:flex;gap:14px;padding:13px 0;align-items:baseline}.steps3 .step+.step{border-top:1px dashed var(--hairline)}.steps3 .num{flex:none;width:24px;height:24px;border-radius:50%;background:var(--bg-inset);color:var(--fg-1);font-size:13px;font-weight:700;display:flex;align-items:center;justify-content:center;align-self:flex-start}.steps3 .txt{font-size:15px}.steps3-card{padding:8px 22px 10px}.ag-node rect{transition:opacity .35s ease,stroke-width .35s ease;opacity:.42}.ag-node text{transition:opacity .35s ease;opacity:.5}.ag-node.lit rect{opacity:1;stroke-width:2.4}.ag-node.lit text{opacity:1}.ag-caption{font-size:13px;color:var(--fg-2);margin-top:8px;text-align:center;min-height:20px;font-weight:500}.ag-log{width:100%;max-width:680px;margin-top:12px;background:var(--bg-inset);border:1px solid var(--hairline);border-radius:var(--r-md);padding:12px 16px;max-height:250px;overflow-y:auto;font-size:13px}.ag-log .placeholder{color:var(--fg-2)}.log-round{font-size:11px;font-weight:700;color:var(--fg-2);margin:10px 0 2px;letter-spacing:.04em}.log-round:first-child{margin-top:0}.log-line{display:flex;gap:8px;padding:3px 0;align-items:baseline;line-height:1.55;color:var(--fg-1)}.log-line .lt{flex:none;font-size:11px;font-weight:700;padding:1px 8px;border-radius:var(--r-pill)}.lt-think{color:var(--sky);background:var(--sky-bg)}.lt-act{color:var(--amber);background:var(--amber-bg)}.lt-obs{color:var(--sage);background:var(--sage-bg)}.lt-ref{color:var(--terracotta);background:var(--terracotta-bg)}.log-line.fail{color:var(--terracotta);font-weight:600}.log-line .mono{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:12px}@media (prefers-reduced-motion: reduce){.ag-node rect,.ag-node text{transition:none!important}}.codebox{background:var(--bg-inset);border:1px solid var(--hairline);border-radius:var(--r-md);padding:14px 18px;overflow-x:auto;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:12.5px;line-height:1.7;color:var(--fg-0);white-space:pre}.codebox .k{color:var(--sky);font-weight:600}.codebox .s{color:var(--amber)}.codebox .cm{color:var(--fg-2)}.codebox.sm{font-size:12px;padding:10px 14px;margin-top:12px}.seq-caption{font-size:13px;color:var(--fg-2);margin-top:10px;text-align:center;min-height:20px;font-weight:500}.seq-step{opacity:0;transition:opacity .45s ease}.seq-step.done{opacity:.42}.seq-step.now{opacity:1}@media (prefers-reduced-motion: reduce){.seq-step{transition:none!important}}.flow-card{padding:8px 22px 10px}.flow-card .phase-tag{padding-top:14px}.rag-caption{font-size:13px;color:var(--fg-2);margin-top:10px;text-align:center;min-height:20px;font-weight:500}.rag-anim{transition:transform .65s cubic-bezier(.2,.7,.3,1),opacity .65s ease}.rag-chunk rect{fill:var(--bg-inset);stroke:var(--hairline);stroke-width:1;transition:fill .5s ease,stroke .5s ease}.rag-chunk text{fill:var(--fg-1);pointer-events:none}.rag-chunk.on text{fill:var(--fg-0)}.rag-chunk.on.c-sky rect{fill:var(--sky-bg);stroke:var(--sky)}.rag-chunk.on.c-amber rect{fill:var(--amber-bg);stroke:var(--amber)}.rag-chunk.on.c-sage rect{fill:var(--sage-bg);stroke:var(--sage)}.rag-dot circle{stroke:none;transition:stroke .4s ease}.rag-dot.hit circle{stroke:var(--terracotta);stroke-width:2.5}@media (prefers-reduced-motion: reduce){.rag-anim,.rag-chunk rect,.rag-dot circle{transition:none!important}}.flow{display:flex;flex-direction:column}.flow-step{display:flex;gap:14px;padding:12px 0;align-items:baseline}.flow-step+.flow-step{border-top:1px dashed var(--hairline)}.flow-step .num{flex:none;width:24px;height:24px;border-radius:50%;background:var(--bg-inset);color:var(--fg-1);font-size:13px;font-weight:700;display:flex;align-items:center;justify-content:center;align-self:flex-start}.flow-step .txt{font-size:15px}.flow-step .txt .footnote{display:block;margin-top:2px}.demo-body.stack{grid-template-columns:1fr}.demo-body.stack .demo-side{border-left:none;border-top:1px solid var(--hairline)}.demo-stage-col{display:flex;flex-direction:column;align-items:center;width:100%}.ctx-caption{font-size:13px;color:var(--fg-2);margin-top:10px;text-align:center;min-height:20px;font-weight:500}.ctx-caption.warn{color:var(--terracotta);font-weight:700}.ctx-card{transition:transform .7s cubic-bezier(.2,.7,.3,1),opacity .7s ease}.ctx-card text{pointer-events:none}.ctx-card .bub-u{fill:var(--sky-bg);stroke:var(--sky)}.ctx-card .bub-a{fill:var(--sage-bg);stroke:var(--sage)}.ctx-card .bub-a.wrong{fill:var(--terracotta-bg);stroke:var(--terracotta)}.ctx-card.evicted .bub-u,.ctx-card.evicted .bub-a,.ctx-card.evicted .bub-a.wrong{fill:var(--bg-inset);stroke:var(--hairline-strong)}.ctx-card.evicted text{fill:var(--fg-2)}@media (prefers-reduced-motion: reduce){.ctx-card{transition:none}}.step+.step{margin-top:18px}.step-head{display:flex;align-items:center;gap:10px;margin-bottom:8px;flex-wrap:wrap}.step-head .step-name{font-size:15px;font-weight:700}.step .verdict{font-size:14px;color:var(--fg-1);margin-top:8px}.step .verdict b{color:var(--fg-0)}.doc-prompt{font-size:14px;line-height:1.9;background:var(--bg-inset);border-radius:var(--r-md);padding:16px 20px}.doc-prompt .sec{font-weight:700}#pr-svg .bar,#pr-svg .gauge-fill{transition:width .4s ease,fill .25s ease}#pr-svg .pf{fill:var(--fg-2);opacity:.55;transition:opacity .2s ease}#pr-svg .pf.on{opacity:1;font-weight:600}.pr-preview{font-size:13.5px;line-height:1.8;color:var(--fg-1);background:var(--bg-inset);border-radius:var(--r-md);padding:10px 14px;margin-top:12px}.su-chat{width:100%;align-self:flex-start;display:flex;flex-direction:column;gap:8px}.su-msg{font-size:13px;line-height:1.65;padding:8px 12px;border-radius:var(--r-md);background:var(--glass);border:1px solid var(--hairline);animation:su-in .25s ease}.su-msg .su-role{font-size:11px;font-weight:700;color:var(--fg-2);margin-right:6px}.su-msg .su-text{color:var(--fg-1)}.su-msg.sys{background:var(--amber-bg);border-left:3px solid var(--amber)}.su-msg.user{background:var(--sky-bg)}.su-msg.asst{background:var(--sage-bg)}.su-badge{display:inline-block;font-size:11px;font-weight:700;padding:1px 8px;border-radius:var(--r-pill);margin-left:6px;white-space:nowrap}.su-badge.ok{color:var(--sage);background:var(--sage-bg)}.su-badge.over{color:var(--terracotta);background:var(--terracotta-bg)}@keyframes su-in{0%{opacity:0;transform:translateY(4px)}}.su-where{font-size:12.5px;font-weight:600;margin-top:12px;padding:8px 12px;border-radius:var(--r-md);background:var(--bg-inset)}.demo-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:14px}@media (prefers-reduced-motion: reduce){#pr-svg .bar,#pr-svg .gauge-fill,#pr-svg .pf{transition:none}.su-msg{animation:none}}.lx-note{font-size:12px;color:var(--fg-2);margin-top:12px}.lx-sub{font-size:12px;font-weight:600;color:var(--fg-2);margin:14px 0 6px}.lx-enter{animation:lx-fade .45s ease}@keyframes lx-fade{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}#demo-pow .pl-line{transition:opacity .2s ease}#demo-pow.focus .pl-line{opacity:.15}#demo-pow.focus .pl-line.hot{opacity:1}@media (prefers-reduced-motion: reduce){.lx-enter{animation:none}#demo-pow .pl-line{transition:none}}#ts-svg .bar{fill:var(--sky);fill-opacity:.72;transition:y .3s ease,height .3s ease}#ts-svg .pct{font-weight:700;transition:y .3s ease}#ts-svg .cut .bar{fill:var(--fg-2);fill-opacity:.18}#ts-svg .cut .pct{fill:var(--fg-2);font-weight:400}#ts-svg .cut .tok{fill:var(--fg-2)}#ts-svg .picked .bar{fill:var(--amber);fill-opacity:.92;stroke:var(--fg-0);stroke-width:1.5}.ts-primary{background:var(--accent);color:var(--on-accent);border-color:var(--accent)}.ts-primary:hover{border-color:var(--accent);opacity:.88}.ts-actions{display:flex;gap:8px;margin-top:14px;flex-wrap:wrap}.ts-sentence{font-size:17px;font-weight:600;margin-top:16px}.ts-sentence .slot{color:var(--terracotta);border-bottom:2px solid var(--hairline-strong);min-width:2.2em;display:inline-block;text-align:center}.ts-history{display:flex;gap:6px;flex-wrap:wrap;margin-top:10px}.ts-note{font-size:12px;color:var(--fg-2);margin-top:12px}@media (prefers-reduced-motion: reduce){#ts-svg .bar,#ts-svg .pct{transition:none}}.pl-stage rect.box{transition:stroke-width .18s ease}.pl-stage.active rect.box{stroke-width:2.6}.pipe-grid{display:grid;grid-template-columns:1.15fr 1fr;gap:16px;margin-top:14px;align-items:start}.pipe-why{font-size:14px;color:var(--fg-1);margin-top:2px}.pipe-why b{color:var(--fg-0)}.io-block.pipe-out{border-left:3px solid var(--sky);background:var(--bg-inset)}.io-block.pipe-out.s-sft{border-left-color:var(--amber)}.io-block.pipe-out.s-rlhf{border-left-color:var(--sage)}.tmpl-body{padding:18px 22px 20px}.tmpl-view{margin-top:14px}.bubble-row{display:flex;margin-top:10px}.bubble{max-width:80%;padding:10px 14px;border-radius:var(--r-lg);font-size:14.5px;line-height:1.6}.bubble.user{margin-left:auto;background:var(--accent);color:var(--on-accent);border-bottom-right-radius:4px}.bubble.asst{background:var(--bg-inset);border:1px solid var(--hairline);border-bottom-left-radius:4px}.raw{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:13px;line-height:2;background:var(--bg-inset);border:1px solid var(--hairline);border-radius:var(--r-md);padding:14px 16px;word-break:break-all}.raw .tok{color:var(--terracotta);font-weight:600}.raw .graded{background:var(--sage-bg);border-bottom:2px solid var(--sage);padding:1px 2px}.raw-legend{font-size:12px;color:var(--fg-2);margin-top:8px}.raw-legend .graded-chip{background:var(--sage-bg);border-bottom:2px solid var(--sage);padding:0 4px}.tmpl-note{font-size:14px;color:var(--fg-1);margin-top:12px}.tmpl-note b{color:var(--fg-0)}.rank-body{padding:18px 22px 20px}.rank-q{font-size:15px;font-weight:600;margin:20px 0 10px}.rank-q.first{margin-top:0}.rank-pair{display:grid;grid-template-columns:1fr 1fr;gap:12px}.rank-card{font-family:inherit;text-align:left;cursor:pointer;padding:14px 16px;font-size:14px;line-height:1.65;color:var(--fg-1);background:var(--bg-card);border:1px solid var(--hairline-strong);border-radius:var(--r-lg);transition:border-color .15s ease,transform .15s ease,opacity .15s ease}.rank-card:hover{border-color:var(--fg-2)}.rank-card:active{transform:scale(.98)}.rank-card .rc-tag{display:block;font-size:12px;font-weight:700;color:var(--fg-2);margin-bottom:6px}.rank-round.done .rank-card{cursor:default;transform:none}.rank-round.done .rank-card.good{border-color:var(--sage);background:var(--sage-bg);color:var(--fg-0)}.rank-round.done .rank-card.bad{opacity:.55}.rank-verdict{display:none;margin-top:10px;font-size:14px;color:var(--fg-1);background:var(--bg-inset);border-radius:var(--r-md);padding:10px 14px}.rank-round.done .rank-verdict{display:block}.rank-verdict b{color:var(--fg-0)}.rank-done{display:none;margin-top:18px;font-size:14px;font-weight:600;color:var(--fg-0);background:var(--sage-bg);border:1px solid var(--sage);border-radius:var(--r-md);padding:10px 14px}.rank-done.show{display:block}#hack-chart .curve{fill:none;stroke-width:2.5}#hack-chart .cursor-line{stroke:var(--fg-2);stroke-dasharray:4 4}.hack-stats{display:flex;flex-direction:column;gap:6px;margin:12px 0 2px}.hs-row{display:flex;justify-content:space-between;align-items:baseline;font-size:13.5px;color:var(--fg-1)}.hs-num{font-weight:700;font-size:16px;font-variant-numeric:tabular-nums;color:var(--fg-0)}.hs-swatch{display:inline-block;width:10px;height:10px;border-radius:3px;margin-right:7px}.hack-note{font-size:13.5px;color:var(--fg-1);margin-top:10px;min-height:4.6em}.hack-note b{color:var(--fg-0)}.tri-v{cursor:pointer;transition:opacity .18s ease}.tri-v circle{transition:stroke-width .18s ease}.tri-v.dim{opacity:.45}.tri-v.active circle{stroke-width:3}#tri-dot{transition:transform .35s ease}#tri-note{font-size:14px;color:var(--fg-1);margin-top:12px}#tri-note b{color:var(--fg-0)}@media (prefers-reduced-motion: reduce){.rank-card,.tri-v,.tri-v circle,#tri-dot{transition:none}}@media (max-width: 700px){.pipe-grid,.rank-pair{grid-template-columns:1fr}}.fill{display:inline-block;min-width:40px;border-bottom:2px solid var(--hairline-strong);vertical-align:baseline}#nt-svg .bar-fill{transition:width .4s ease}#nt-svg text{-webkit-user-select:none;user-select:none}.flow-body{padding:20px 22px}.flow-body svg{width:100%;height:auto;display:block}.pl-stage{cursor:pointer;transition:opacity .18s ease}.pl-stage rect{transition:stroke-width .18s ease}.pl-stage.dim{opacity:.42}.pl-stage.active rect{stroke-width:2.4}.pl-detail{border-top:1px solid var(--hairline);padding:16px 22px 20px}.pl-detail h4{font-size:16px;font-weight:700;margin-top:12px}.pl-detail p{font-size:14px;color:var(--fg-1);margin-top:6px}.io-stage{align-items:flex-start}.io-stack{display:flex;flex-direction:column;gap:12px;width:100%}.io-block{border:1px solid var(--hairline-strong);border-radius:var(--r-md);padding:12px 16px;background:var(--glass)}.io-block .io-label{font-size:12px;font-weight:600;color:var(--fg-2);margin-bottom:6px}.io-block .io-text{font-size:15px;line-height:1.65;white-space:pre-line;min-height:1.65em}.io-block.out{border-left:3px solid var(--terracotta);background:var(--bg-inset)}.io-block.out.asst{border-left-color:var(--sage)}.bp-caret{display:inline-block;width:2px;height:1em;background:var(--fg-2);vertical-align:-2px;margin-left:1px;animation:bp-blink 1s steps(1) infinite}@keyframes bp-blink{50%{opacity:0}}.side-step{font-size:12px;font-weight:600;color:var(--fg-2);margin:14px 0 8px}.side-step.first{margin-top:0}@media (prefers-reduced-motion: reduce){.pl-stage,.pl-stage rect,#nt-svg .bar-fill{transition:none}.bp-caret{animation:none}}.pipe{display:flex;align-items:stretch;gap:8px;flex-wrap:wrap}.pipe-step{flex:1 1 140px;min-width:130px;padding:14px 12px;background:var(--bg-inset);border-radius:var(--r-md);text-align:center}.pipe-step .ps-label{font-size:12px;font-weight:600;color:var(--fg-2)}.pipe-step .ps-val{font-size:14px;font-weight:700;margin-top:8px;line-height:1.6}.pipe-arrow{align-self:center;color:var(--fg-2);font-weight:700;flex:none}.pipe-note{margin-top:14px}.pipe-note b{color:var(--fg-0)}.mini-tok{display:inline-block;padding:2px 7px;margin:1px 2px;border-radius:var(--r-sm);font-size:13px;font-weight:700}.tok{display:inline-flex;flex-direction:column;align-items:center;gap:1px;padding:6px 10px 4px;border-radius:var(--r-sm)}.tok .tt{font-size:15px;font-weight:700;line-height:1.35;word-break:break-all}.tok .tid{font-size:10px;font-weight:600;font-variant-numeric:tabular-nums}.tkc0{background:var(--sage-bg);border-bottom:2px solid var(--sage)}.tkc1{background:var(--sky-bg);border-bottom:2px solid var(--sky)}.tkc2{background:var(--amber-bg);border-bottom:2px solid var(--amber)}.tkc3{background:var(--terracotta-bg);border-bottom:2px solid var(--terracotta)}.tkc0 .tid{color:var(--sage)}.tkc1 .tid{color:var(--sky)}.tkc2 .tid{color:var(--amber)}.tkc3 .tid{color:var(--terracotta)}.tok-body{padding:20px 22px;display:flex;flex-direction:column;gap:14px}.tok-input{width:100%;min-height:76px;resize:vertical;box-sizing:border-box;font-family:inherit;font-size:15px;line-height:1.7;color:var(--fg-0);background:var(--bg-inset);border:1px solid var(--hairline-strong);border-radius:var(--r-md);padding:12px 14px}.tok-input:focus{outline:none;border-color:var(--sky)}.tok-out{display:flex;flex-wrap:wrap;gap:8px;align-content:flex-start;min-height:58px;padding:14px;border:1px dashed var(--hairline-strong);border-radius:var(--r-md)}.tok-empty{font-size:14px;color:var(--fg-2)}.tok-stats{font-size:14px;color:var(--fg-1)}.tok-stats b{font-size:17px;color:var(--fg-0);font-variant-numeric:tabular-nums}.bpe-stage-inner{width:100%;align-self:stretch;display:flex;flex-direction:column;justify-content:center}.bpe-blocks{display:flex;flex-wrap:wrap;gap:6px;align-content:flex-start;min-height:96px;padding:14px;border:1px dashed var(--hairline-strong);border-radius:var(--r-md)}.bpe-blocks .mini-tok{font-size:16px;padding:6px 11px;margin:0}.bpe-new{box-shadow:0 0 0 2px var(--terracotta)}.bpe-meter{margin-top:16px}.bpe-meter .bm-label{font-size:12px;font-weight:600;color:var(--fg-2);display:flex;justify-content:space-between;gap:10px;margin-bottom:6px;font-variant-numeric:tabular-nums}.bpe-meter .bm-track{height:8px;border-radius:var(--r-pill);background:var(--bg-inset);overflow:hidden}.bpe-meter .bm-fill{height:100%;border-radius:var(--r-pill);background:var(--sage);transition:width .3s ease}.bpe-formula{display:flex;align-items:center;gap:4px;flex-wrap:wrap;margin-top:12px;font-size:15px;font-weight:700;min-height:32px}.bpe-formula .footnote{font-weight:500}.bpe-ctrl{display:flex;gap:8px;margin-top:16px;flex-wrap:wrap}.bpe-ctrl .chip:disabled{opacity:.4;cursor:default}table.match td.ph{font-weight:600;width:42%}@media (prefers-reduced-motion: no-preference){.tok{animation:tok-in .18s ease}@keyframes tok-in{0%{transform:scale(.85);opacity:0}}.bpe-new{animation:bpe-pop .35s ease}@keyframes bpe-pop{0%{transform:scale(.7);opacity:.4}}}@media (prefers-reduced-motion: reduce){.bpe-meter .bm-fill{transition:none}}.tf-layer{cursor:pointer;transition:opacity .2s ease}.tf-layer .lr{transition:stroke-width .2s ease}.tf-layer text{pointer-events:none}.tf-layer.dim{opacity:.4}.tf-layer.active .lr{stroke-width:2.5}table.match td.be{white-space:nowrap}.mech{padding:18px 22px}.mech-head{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:4px}.mech-name{font-size:16px;font-weight:700}.mech p{font-size:14px;color:var(--fg-1);margin-top:8px}.mech p b{color:var(--fg-0)}.mech .q{font-weight:700;color:var(--fg-0)}table.match.map td:first-child{font-weight:600;font-size:15px;color:var(--fg-0);width:44%}.demo-stage.stage-col{flex-direction:column;align-items:stretch;justify-content:flex-start;gap:14px}.gen-sent{display:flex;flex-wrap:wrap;gap:6px;align-items:center;min-height:40px}.gtoken{padding:5px 11px;border-radius:8px;font-size:14px;font-weight:600;color:var(--fg-0);background:var(--bg-inset);border:1px solid var(--hairline-strong)}.gtoken.gen{background:var(--sage-bg);border-color:var(--sage)}.gtoken.latest{box-shadow:0 0 0 2px var(--sage-bg);border-width:1.5px}.gcursor{color:var(--terracotta);font-weight:700}.gen-bars{display:flex;flex-direction:column;gap:4px;min-height:130px}.ghint{font-size:13px;color:var(--fg-2);margin:auto 0;text-align:center}.gbar{display:flex;align-items:center;gap:10px;font-size:13px}.gbar .gtok{min-width:46px;text-align:right;font-weight:600;color:var(--fg-1)}.gbar .gtrack{flex:1;height:18px;background:var(--bg-inset);border-radius:6px;overflow:hidden}.gbar .gfill{height:100%;width:0;background:var(--sky);border-radius:6px;opacity:.75}.gbar .gpct{min-width:64px;font-variant-numeric:tabular-nums;color:var(--fg-2)}.gbar.pick .gtok{color:var(--fg-0);font-weight:700}.gbar.pick .gfill{background:var(--sage);opacity:1}.gbar.pick .gpct{color:var(--sage);font-weight:700}.gen-ctrl{display:flex;gap:8px;flex-wrap:wrap}.gen-ctrl .chip[disabled]{opacity:.4;cursor:not-allowed}.scope-row{display:flex;flex-wrap:wrap;gap:8px;justify-content:center}.stok{font-family:inherit;font-size:15px;font-weight:600;padding:8px 14px;border-radius:10px;cursor:pointer;border:1px solid var(--hairline-strong);background:var(--bg-inset);color:var(--fg-1)}.stok.vis{background:var(--sage-bg);border-color:var(--sage);color:var(--fg-0)}.stok.cur{background:var(--terracotta-bg);border-style:dashed;border-color:var(--terracotta);color:var(--terracotta);font-weight:700}.stok.blind{opacity:.3}.scope-legend{display:flex;gap:14px;flex-wrap:wrap;justify-content:center;font-size:12px;color:var(--fg-2)}.scope-legend .sw{display:inline-block;width:12px;height:12px;border-radius:4px;vertical-align:-1px;margin-right:5px}@media (prefers-reduced-motion: no-preference){.gbar .gfill{transition:width .45s ease}.gtoken,.stok{transition:background .2s ease,border-color .2s ease,opacity .2s ease,color .2s ease}.gcursor{animation:gblink 1.1s steps(2) infinite}@keyframes gblink{50%{opacity:0}}}.mt{margin-top:22px}.formula-line{font-size:19px;font-weight:700;text-align:center;letter-spacing:.03em;font-variant-numeric:tabular-nums}.attn-word{cursor:pointer}.attn-word rect{transition:stroke .15s ease}.attn-word:hover rect{stroke:var(--fg-2)}.attn-word:focus-visible rect{stroke:var(--sky);stroke-width:2}#relay-svg text,#head-svg text{-webkit-user-select:none;user-select:none}@media (prefers-reduced-motion: no-preference){.attn-arc{animation:arc-in .35s ease both}@keyframes arc-in{0%{opacity:0}}}.formula{font-size:clamp(19px,3.2vw,24px);font-weight:700;text-align:center;letter-spacing:.02em;padding:4px 0 6px}.formula .op{color:var(--fg-2);padding:0 4px;font-weight:500}.formula .res{color:var(--terracotta)}#cosmos{position:relative;width:100%;aspect-ratio:4 / 3;max-height:430px}#cosmos canvas{width:100%;height:100%;display:block;border-radius:var(--r-md);touch-action:none}.cosmos-fallback{height:100%;display:flex;flex-direction:column;justify-content:center;gap:8px;padding:24px;background:var(--bg-inset);border-radius:var(--r-md);font-size:14px;color:var(--fg-1)}.cosmos-fallback b{color:var(--fg-0)}.chip-play{color:var(--terracotta);border-color:var(--terracotta)}.chip-play:hover{border-color:var(--terracotta);background:var(--terracotta-bg)}#train-svg .tw{transition:transform .8s cubic-bezier(.22,.8,.3,1)}#train-svg .tw circle{transition:fill .8s ease}#train-svg .tw text{font-size:13px;font-weight:600;fill:var(--fg-0)}.errbar-row{display:flex;align-items:center;gap:10px;margin-top:16px;font-size:13px;font-weight:600;color:var(--fg-1)}.errbar-row .errbar{flex:1;height:8px;border-radius:var(--r-pill);background:var(--bg-inset);overflow:hidden}.errbar-row .errbar i{display:block;height:100%;background:var(--terracotta);border-radius:var(--r-pill);transition:width .7s ease}.errbar-row .ev{font-weight:700;min-width:44px;text-align:right;font-variant-numeric:tabular-nums;color:var(--fg-0)}#ctx-svg #apple-g{transition:transform .9s cubic-bezier(.22,.8,.3,1)}@media (prefers-reduced-motion: reduce){#train-svg .tw,#train-svg .tw circle,#ctx-svg #apple-g,.errbar-row .errbar i{transition:none}}.pix-card{padding:22px;display:flex;flex-direction:column;align-items:center;gap:12px;margin-top:14px}.pix-card svg{max-width:100%;height:auto}.pix-card .footnote{text-align:center}.conv-demo .demo-stage{padding:22px 16px 12px;min-height:0}.conv-demo .demo-side{border-left:none;border-top:1px solid var(--hairline)}.conv-demo .ctrl-row{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}.conv-demo .demo-side h4{margin-top:16px}#ck-status{margin-top:10px;font-variant-numeric:tabular-nums}.abs-layer{cursor:pointer;transition:opacity .2s ease}.abs-layer text{pointer-events:none}.abs-layer .layer-box{transition:fill .2s ease,stroke .2s ease}.abs-layer.dim{opacity:.4}.abs-layer.active .layer-box{fill:var(--sky-bg);stroke:var(--sky);stroke-width:1.8}#llm-gauge rect{transition:fill-opacity .2s ease}.llm-arc{opacity:.07;transition:opacity .25s ease}#llm-arcs.z-shallow .llm-arc[data-zone=shallow],#llm-arcs.z-mid .llm-arc[data-zone=mid],#llm-arcs.z-deep .llm-arc[data-zone=deep]{opacity:1}#llm-arcs.z-mid .llm-arc[data-zone=shallow]{opacity:.18}#llm-arcs.z-deep .llm-arc[data-zone=shallow]{opacity:.14}#llm-arcs.z-deep .llm-arc[data-zone=mid]{opacity:.3}.llm-tok rect{fill:var(--bg-inset);stroke:var(--hairline-strong);transition:stroke .2s ease}.llm-tok.hot rect{stroke:var(--fg-0);stroke-width:1.6}.llm-tok text{pointer-events:none}#bp-edges line{transition:stroke .35s ease,stroke-width .35s ease,opacity .35s ease}#bp-nodes circle{transition:stroke .3s ease,fill .3s ease}#bp-loss-fill{transition:width .45s ease}.bp-fade{transition:opacity .3s ease}.bp-stepbar{display:flex;gap:6px;margin:12px 0 4px}.bp-stepbar button{font-family:inherit;width:24px;height:24px;padding:0;border-radius:50%;border:1px solid var(--hairline-strong);background:var(--glass);color:var(--fg-2);font-size:11px;font-weight:700;cursor:pointer;transition:background .15s ease,color .15s ease,border-color .15s ease}.bp-stepbar button:hover{border-color:var(--fg-2)}.bp-stepbar button.on{background:var(--accent);color:var(--on-accent);border-color:var(--accent)}.model-depths{display:flex;gap:8px;flex-wrap:wrap}@media (prefers-reduced-motion: reduce){.abs-layer,.abs-layer .layer-box,#llm-gauge rect,.llm-arc,.llm-tok rect,#bp-edges line,#bp-nodes circle,#bp-loss-fill,.bp-fade,.bp-stepbar button{transition:none!important}}.err-bars{display:flex;gap:16px;margin-top:18px}.err-col{flex:1;text-align:center}.err-track{height:110px;background:var(--bg-inset);border:1px solid var(--hairline);border-radius:var(--r-sm);display:flex;align-items:flex-end;overflow:hidden}.err-fill{width:100%;height:0%;transition:height .45s ease}.err-val{font-size:16px;font-weight:700;margin-top:6px;font-variant-numeric:tabular-nums}.err-lbl{font-size:12px;color:var(--fg-2);margin-top:1px}@media (prefers-reduced-motion: reduce){.err-fill{transition:none}}.act-diagram-card{padding:16px 18px;overflow:hidden;margin-bottom:14px}#act-bend-svg{width:100%;height:auto;display:block}#act-bend-svg text{-webkit-user-select:none;user-select:none}#neuron-svg text{font-family:inherit}#neuron-svg .w-edge{transition:stroke-width .18s ease,stroke .18s ease,stroke-opacity .18s ease}#neuron-svg .soft{transition:fill .22s ease,stroke .22s ease,fill-opacity .18s ease,opacity .25s ease}.param-cap{font-size:12px;font-weight:600;color:var(--fg-2);letter-spacing:.05em;margin-top:14px;margin-bottom:2px}.param-cap:first-child{margin-top:0}.neu-readout{margin-top:14px;padding:12px 16px;background:var(--bg-inset);border-radius:var(--r-md);font-size:14px;font-variant-numeric:tabular-nums}.neu-readout .ro-line{color:var(--fg-1)}.neu-readout .ro-line b{color:var(--fg-0)}.neu-verdict{margin-top:10px;display:flex;align-items:center;gap:8px;flex-wrap:wrap;font-size:13px;color:var(--fg-2)}@media (prefers-reduced-motion: reduce){#neuron-svg *{transition:none!important}}.gd-wrap{position:relative;width:100%;height:360px}.gd-wrap canvas{border-radius:var(--r-md);touch-action:none}.gd-fallback{padding:18px;font-size:14px;line-height:1.7;color:var(--fg-1);background:var(--bg-inset);border-radius:var(--r-md)}.gd-status{margin-top:14px;font-size:13.5px;font-weight:600;color:var(--fg-1);min-height:40px;line-height:1.55}.gd-status .num{font-variant-numeric:tabular-nums;color:var(--fg-0)}.gd-status .ok{color:var(--sage)}.gd-status .warn{color:var(--terracotta)}.chip:disabled{opacity:.45;cursor:not-allowed}.prose p{font-size:15px;color:var(--fg-1);line-height:1.75}.prose p+p{margin-top:10px}.prose b{color:var(--fg-0)}.mt14{margin-top:14px}.gd-shake{animation:gd-shake .45s ease}@keyframes gd-shake{0%,to{transform:none}20%{transform:translate(-5px)}40%{transform:translate(5px)}60%{transform:translate(-3px)}80%{transform:translate(3px)}}@media (max-width: 700px){.gd-wrap{height:300px}}