.stage{position:relative} .scene{--p:0;position:relative} .scene[data-pin]{height:calc(var(--len,3) * 100vh)} .pin{position:sticky;top:0;height:100vh;overflow:hidden;display:flex;align-items:center;justify-content:center} .scene-inner{position:relative;z-index:2;width:100%;max-width:76rem;margin:0 auto;padding:0 1.25rem;display:grid;gap:2.5rem;align-items:center} @media (min-width:1024px){.scene-inner{grid-template-columns:minmax(0,5fr) minmax(0,6fr);gap:3.5rem;padding:0 5rem 0 4.5rem}} .parallax-field{position:absolute;inset:0;z-index:0;overflow:hidden;pointer-events:none} .grid-bg{position:absolute;inset:-30%;background-image:linear-gradient( color-mix(in oklch,var(--foreground) 4.5%,transparent) 1px,transparent 1px ),linear-gradient( 90deg,color-mix(in oklch,var(--foreground) 4.5%,transparent) 1px,transparent 1px );background-size:64px 64px;-webkit-mask-image:radial-gradient( ellipse 90% 75% at 50% 45%,black 30%,transparent 78% );mask-image:radial-gradient( ellipse 90% 75% at 50% 45%,black 30%,transparent 78% )} .glyph{position:absolute;font-family:var(--font-mono);font-size:clamp(0.72rem,1.5vw,1.05rem);color:color-mix(in oklch,var(--primary) 22%,transparent);white-space:nowrap;letter-spacing:0.02em;will-change:transform;opacity:0.85} [data-parallax]{will-change:transform} .glyph.g1{top:14%;left:6%} .glyph.g2{top:74%;left:58%} .glyph.g3{top:30%;left:74%} .glyph.g4{top:84%;left:14%} .glyph.g5{top:56%;left:4%} .glyph.g6{top:12%;left:62%} .scene-copy,.scene-stage{will-change:transform,opacity} .scene-copy{display:grid;gap:1rem;align-content:center;opacity:clamp(0,calc((var(--p) - 0.06) / 0.22),1);transform:translateY( calc(44px * (1 - clamp(0,calc((var(--p) - 0.06) / 0.22),1))) )} .scene-stage{opacity:clamp(0,calc((var(--p) - 0.28) / 0.24),1);transform:translateY( calc(56px * (1 - clamp(0,calc((var(--p) - 0.28) / 0.24),1))) )} .kicker{color:var(--primary);font-size:0.8125rem;font-weight:600;letter-spacing:0.04em;margin-bottom:0} .scene-title{font-family:var(--font-heading);font-size:clamp(1.9rem,4.2vw,3rem);font-weight:600;line-height:1.18;letter-spacing:-0.01em;color:var(--foreground)} .scene-desc{color:var(--muted-foreground);font-size:1.02rem;line-height:1.85;max-width:34rem} .scene-points{list-style:none;margin:0;padding:0;display:grid;gap:0.5rem} .scene-points li{display:flex;gap:0.55rem;font-size:0.9rem;color:var(--foreground);opacity:0.92} .scene-points li::before{content:"—";color:var(--primary);flex-shrink:0} .ghost-num{position:absolute;top:50%;left:1.5rem;transform:translate3d(0,calc(var(--py,0) * 1px),0) translateY(-50%) translateY(calc(40px * (1 - var(--p)))) scale(calc(0.92 + 0.08 * var(--p)));font-family:var(--font-display);font-size:clamp(7rem,24vw,19rem);line-height:1;font-weight:600;color:color-mix(in oklch,var(--primary) 7%,transparent);pointer-events:none;user-select:none;z-index:0;opacity:0.14} .scene-hero{background:radial-gradient( ellipse 70% 60% at 75% 20%,color-mix(in oklch,var(--primary) 8%,transparent),transparent 70% )} .hero-inner{min-height:100%} .hero-copy{display:grid;gap:1.1rem;align-content:center;opacity:calc(1 - clamp(0,calc((var(--p) - 0.5) / 0.38),1));transform:translateY( calc(70px * clamp(0,calc((var(--p) - 0.5) / 0.38),1)) )} .hero-copy .wordmark{font-size:clamp(1.9rem,4.6vw,4rem);white-space:nowrap;line-height:1.06} .hero-copy .slogan{font-size:clamp(1.15rem,2.4vw,1.6rem);color:var(--foreground)} .hero-copy .lead{font-size:1.02rem;max-width:30rem} .reveal-on-load{animation:rise-in 640ms cubic-bezier(0.22,1,0.36,1) both} .hero-copy .reveal-on-load:nth-child(2){animation-delay:80ms} .hero-copy .reveal-on-load:nth-child(3){animation-delay:160ms} .hero-copy .reveal-on-load:nth-child(4){animation-delay:240ms} .hero-copy .reveal-on-load:nth-child(5){animation-delay:320ms} .hero-copy .reveal-on-load:nth-child(6){animation-delay:400ms} .hero-visual{position:relative;display:grid;gap:1.25rem;opacity:calc(1 - clamp(0,calc((var(--p) - 0.58) / 0.32),1));transform:translate3d(0,calc(var(--py,0) * 1px),0) translateY(calc(-90px * clamp(0,calc((var(--p) - 0.55) / 0.35),1)))} .editor-card,.paper-card,.terminal-card,.marker-card,.agent-loop{border:1px solid var(--border);border-radius:calc(var(--radius) * 1.1);background:var(--card);box-shadow:var(--shadow-window);overflow:hidden} .type-lines{margin:0;padding:1rem 1.1rem;font-family:var(--font-mono);font-size:0.78rem;line-height:1.95;color:var(--code-fg);background:var(--code-bg);min-height:10rem;white-space:pre-wrap} .type-caret{display:inline-block;width:0.55em;height:1.05em;margin-left:2px;background:var(--primary);vertical-align:text-bottom;animation:caret-blink 1.1s steps(1) infinite} .paper-card{padding:1.4rem 1.6rem 1.2rem;transform:rotate(1.4deg) translateX(0.4rem);background:var(--card)} .paper-title{font-family:var(--font-display);font-size:1.45rem;font-weight:600;color:var(--foreground)} .paper-author{margin-top:0.2rem;font-family:var(--font-mono);font-size:0.66rem;color:var(--muted-foreground)} .paper-abs{margin-top:0.9rem;font-size:0.875rem;line-height:1.95;text-align:justify;color:var(--foreground);opacity:0.92} .paper-meta{margin-top:1rem;display:flex;align-items:center;justify-content:space-between;gap:0.75rem;flex-wrap:wrap;font-family:var(--font-mono);font-size:0.64rem;color:var(--muted-foreground)} .paper-ok{display:inline-flex;align-items:center;gap:0.3rem;color:var(--primary);font-weight:600} .paper-ok .icon{width:0.9rem;height:0.9rem} .connect-dots{position:absolute;top:0;bottom:0;left:50%;width:1px;border-left:1px dotted color-mix(in oklch,var(--primary) 40%,transparent);opacity:0.7;z-index:-1} .hero-hint{position:absolute;bottom:1.4rem;left:50%;transform:translateX(-50%);display:inline-flex;align-items:center;gap:0.5rem;font-size:0.8125rem;font-family:var(--font-mono);color:var(--muted-foreground);opacity:calc(1 - clamp(0,calc(var(--p) * 3.4),1));z-index:3;white-space:nowrap} .hero-hint .icon{animation:bob 1.8s ease-in-out infinite} @keyframes caret-blink{50%{opacity:0}} @keyframes bob{0%,100%{transform:translateY(0)} 50%{transform:translateY(5px)}} .problem-stage,.answer-stage{display:grid;gap:1rem;align-content:center} .terminal-card{overflow:hidden} .term-body{margin:0;padding:1rem 1.1rem;font-family:var(--font-mono);font-size:0.75rem;line-height:1.9;white-space:pre;overflow-x:auto;background:var(--code-bg);color:var(--code-fg)} .term-body .err{color:var(--destructive);font-weight:600} .term-body .ok{color:var(--primary)} .term-body .dim{color:var(--muted-foreground)} .chat-fail{display:grid;gap:0.5rem} .marker-row{display:flex;align-items:center;gap:0.75rem;padding:1rem 1.1rem} .marker-row .code-block{flex:1;min-width:0;margin:0} .marker-arrow{color:var(--primary);flex-shrink:0} .marker-arrow .icon{width:1.25rem;height:1.25rem} .c-marker{color:var(--primary);font-weight:600} .marker-note{padding:0 1.1rem 1rem;font-size:0.75rem;line-height:1.75;color:var(--muted-foreground)} .marker-note code{font-family:var(--font-mono);color:var(--primary);background:color-mix(in oklch,var(--primary) 10%,transparent);border-radius:4px;padding:0 0.3em} .agent-loop{padding:1rem 1.1rem} .sub-cards{display:grid;gap:0.7rem} .sub-card{display:flex;gap:0.8rem;align-items:flex-start;padding:0.85rem 1rem;border:1px solid var(--border);border-radius:calc(var(--radius) * 0.9);background:var(--card);box-shadow:var(--shadow-card)} .sub-card .fc-icon{color:var(--primary);flex-shrink:0;padding-top:0.1rem} .sub-card .fc-icon .icon{width:1.15rem;height:1.15rem} .sub-card .fc-title{font-size:0.9375rem;font-weight:600;font-family:var(--font-heading)} .sub-card .fc-desc{font-size:0.8rem;line-height:1.7;color:var(--muted-foreground);margin-top:0.2rem} .scene-stage .feature-card{max-width:40rem;margin-left:auto} .principles-inner,.stack-inner{max-width:70rem;display:grid;grid-template-columns:1fr;gap:2.5rem;justify-items:center;text-align:center} .principles-head{display:grid;gap:0.75rem;justify-items:center;opacity:clamp(0,calc((var(--p) - 0.04) / 0.2),1);transform:translateY( calc(40px * (1 - clamp(0,calc((var(--p) - 0.04) / 0.2),1))) )} .principles-head .scene-desc{margin:0 auto} .scene-principles .principle-grid{width:100%} .scene-principles .principle:nth-child(1){opacity:clamp(0,calc((var(--p) - 0.14) / 0.18),1);transform:translateY( calc(44px * (1 - clamp(0,calc((var(--p) - 0.14) / 0.18),1))) )} .scene-principles .principle:nth-child(2){opacity:clamp(0,calc((var(--p) - 0.26) / 0.18),1);transform:translateY( calc(44px * (1 - clamp(0,calc((var(--p) - 0.26) / 0.18),1))) )} .scene-principles .principle:nth-child(3){opacity:clamp(0,calc((var(--p) - 0.38) / 0.18),1);transform:translateY( calc(44px * (1 - clamp(0,calc((var(--p) - 0.38) / 0.18),1))) )} .scene-stack .stack-grid{width:100%} .themes-pin{overflow:hidden} .themes-viewport{width:100%;overflow:hidden;z-index:2;position:relative} .themes-track{display:flex;align-items:center;gap:2rem;width:max-content;padding:0 9vw;will-change:transform;transform:translate3d(calc(var(--p) * -1 * var(--tw,0) * 1px),0,0)} .themes-head{flex:none;width:min(21rem,78vw);display:grid;gap:1rem;align-content:center;padding-right:1rem} .themes-scroll-hint{display:inline-flex;align-items:center;gap:0.5rem;font-family:var(--font-mono);font-size:0.75rem;color:var(--muted-foreground)} .themes-scroll-hint .icon{animation:bob 1.8s ease-in-out infinite} .themes-track .theme-showcase{display:flex;gap:1.25rem;flex:none} .themes-track .theme-card{width:15.5rem;flex:none;padding:1.1rem} .themes-track .theme-card .t-swatch{height:4.5rem} .outro-inner{max-width:48rem;text-align:center;justify-items:center;display:grid;gap:1.4rem} .outro-title{font-family:var(--font-heading);font-size:clamp(1.8rem,4.4vw,2.8rem);font-weight:600;line-height:1.3;letter-spacing:-0.01em} .scene-outro .scene-desc{margin:0 auto} .progress-track{position:fixed;top:0;left:0;right:0;height:2px;z-index:60;background:color-mix(in oklch,var(--foreground) 8%,transparent)} .progress-fill{height:100%;width:0;background:linear-gradient( 90deg,var(--primary),color-mix(in oklch,var(--primary) 55%,var(--foreground)) )} .line-gutter{position:fixed;left:0;top:0;bottom:0;width:3.4rem;z-index:55;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:0.4rem;pointer-events:none;border-right:1px solid color-mix(in oklch,var(--foreground) 7%,transparent)} .lg-file{writing-mode:vertical-rl;font-family:var(--font-mono);font-size:0.625rem;letter-spacing:0.18em;color:var(--muted-foreground);opacity:0.75} .lg-numbers{position:relative;display:flex;flex-direction:column;align-items:flex-end;font-family:var(--font-mono);font-size:0.625rem;line-height:1.32rem;color:var(--muted-foreground);opacity:0.6} .lg-numbers span{padding-right:0.7rem;font-variant-numeric:tabular-nums} .lg-numbers span.cur{color:var(--primary);opacity:1;font-weight:600} .scene-rail{position:fixed;right:0.9rem;top:50%;transform:translateY(-50%);z-index:55;display:flex;flex-direction:column;gap:0.1rem} .rail-item{display:flex;align-items:center;justify-content:flex-end;gap:0.4rem;padding:0.22rem 0.55rem;border-radius:9999px;color:var(--muted-foreground);font-family:var(--font-mono);font-size:0.6875rem;white-space:nowrap;transition:color 300ms,background-color 300ms} .rail-item .rail-no{font-weight:600;font-variant-numeric:tabular-nums} .rail-item .rail-name{max-width:0;opacity:0;overflow:hidden;transition:max-width 300ms,opacity 300ms} .rail-item:hover,.rail-item.active{color:var(--primary);background:color-mix(in oklch,var(--primary) 9%,transparent)} .rail-item:hover .rail-name,.rail-item.active .rail-name{max-width:6.5rem;opacity:1;margin-left:0.2rem} .rail-item.active{font-weight:600} .compile-chip{position:fixed;left:1.1rem;bottom:1.1rem;z-index:55;display:inline-flex;align-items:center;gap:0.5rem;padding:0.4rem 0.85rem;border:1px solid var(--border);border-radius:9999px;background:var(--card);box-shadow:var(--shadow-card);font-family:var(--font-mono);font-size:0.6875rem;color:var(--muted-foreground);pointer-events:none} .compile-chip .icon{color:var(--primary);width:0.9rem;height:0.9rem;animation:spin 2.6s linear infinite} .compile-chip.done{color:var(--primary);border-color:color-mix(in oklch,var(--primary) 45%,var(--border))} .compile-chip.done .icon{animation:none} @keyframes spin{to{transform:rotate(360deg)}} html.no-pin .scene[data-pin]{height:auto} html.no-pin .pin{position:static;height:auto;overflow:visible;display:block} html.no-pin .scene-inner{grid-template-columns:1fr;gap:2rem;padding:5rem 1.25rem 4rem;max-width:52rem} html.no-pin .scene-copy,html.no-pin .scene-stage,html.no-pin .principles-head,html.no-pin .scene-principles .principle{opacity:1;transform:none} html.no-pin .hero-copy,html.no-pin .hero-visual{opacity:1;transform:none} html.no-pin .ghost-num{position:static;opacity:0.35;transform:none;font-size:clamp(3rem,14vw,6rem);text-align:center} html.no-pin .hero-hint{display:none} html.no-pin .themes-track{transform:none !important;width:auto;flex-wrap:wrap;padding:0} html.no-pin .themes-track .theme-showcase{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));width:100%} html.no-pin .themes-track .theme-card{width:auto} html.no-pin .themes-head{width:100%;padding-inline:1.25rem} html.no-pin .type-caret{animation:none} @media (max-width:1023px){.line-gutter,.scene-rail,.compile-chip{display:none} .hero-visual{margin-top:1.5rem}} @media (prefers-reduced-motion:reduce){html.no-pin .pin{display:block} .hero-hint .icon,.themes-scroll-hint .icon{animation:none}} .scene-principles .principle-grid,.scene-stack .stack-grid{grid-template-columns:1fr;gap:1rem;width:100%;max-width:48rem;margin:0 auto} @media (min-width:768px){.scene-principles .principle{grid-template-columns:auto minmax(0,2.4fr);grid-template-rows:auto auto;grid-template-areas:"head desc" "head points";gap:0.5rem 2.5rem;text-align:left;align-items:start} .scene-principles .pr-head{grid-area:head;align-self:center} .scene-principles .pr-desc{grid-area:desc} .scene-principles .pr-points{grid-area:points} .scene-stack .stack-card{grid-template-columns:minmax(0,1fr) minmax(0,1.6fr);grid-template-areas:"name desc" "tags desc";gap:1rem 2.5rem;text-align:left;align-items:center} .scene-stack .stack-name{grid-area:name} .scene-stack .tags{grid-area:tags} .scene-stack .stack-card .fc-desc{grid-area:desc}} .principles-inner,.stack-inner{gap:1.5rem} .principles-head{gap:0.5rem} .principles-head .scene-title{font-size:clamp(1.6rem,3vw,2.2rem)} .principles-head .scene-desc{font-size:0.95rem} .scene-principles .principle-grid,.scene-stack .stack-grid{gap:0.75rem} .scene-principles .principle{padding:1.2rem 1.4rem} .scene-principles .pr-icon .icon{width:1.25rem;height:1.25rem} .scene-principles .pr-title{font-size:1rem} .scene-principles .pr-desc{font-size:0.82rem;line-height:1.65;max-width:30rem} .scene-principles .pr-points li{font-size:0.78rem} .scene-stack .stack-card{padding:1.15rem 1.4rem} .scene-stack .stack-name{font-size:0.95rem} .scene-stack .stack-card .fc-desc{font-size:0.82rem;line-height:1.65} .scene-stack .tags{gap:0.4rem} .scene-stack .tag{font-size:0.72rem;padding:0.15rem 0.55rem} .scene.unfit[data-pin]{height:auto} .scene.unfit .pin{position:static;height:auto;overflow:visible;display:block} .scene.unfit .scene-inner{grid-template-columns:1fr;gap:2rem;padding:5rem 1.25rem 4rem;max-width:60rem} .scene.unfit .scene-copy,.scene.unfit .scene-stage,.scene.unfit .principles-head,.scene.unfit .principle,.scene.unfit .stack-card,.scene.unfit .hero-copy,.scene.unfit .hero-visual{opacity:1;transform:none} .scene.unfit .ghost-num{position:static;opacity:0.35;transform:none;font-size:clamp(3rem,14vw,6rem);text-align:center} .scene.unfit .hero-hint{display:none} .paper-ok .icon{width:0.9rem;height:0.9rem;animation:spin 2.6s linear infinite} .paper-ok:not(.compiling) .icon{animation:none} .paper-ok.compiling{color:var(--muted-foreground)}