:root{--paper:#f4efe6;--paper-deep:#ece5d9;--paper-soft:#f8f4ec;--ink:#1a1815;--ink-soft:#2b2722;--muted:#6f675c;--muted-light:#8b8275;--cinnabar:#a63b2a;--cinnabar-deep:#882e20;--line:#1a181524;--line-strong:#1a181552;--serif:"Songti SC", "Noto Serif SC", "Source Han Serif SC", "STSong", "SimSun", "Times New Roman", serif;--sans:"PingFang SC", "Noto Sans SC", "Hiragino Sans GB", -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;--mono:"SF Mono", "IBM Plex Mono", Menlo, Consolas, "Liberation Mono", monospace;--wrap:1180px;--gutter:clamp(20px, 5vw, 64px);--section-pad:clamp(80px, 10vw, 140px)}*,:before,:after{box-sizing:border-box}html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}body{background-color:var(--paper);color:var(--ink);font-family:var(--sans);text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;background-image:radial-gradient(60% 45% at 12% 0,#a63b2a09,#0000 70%),radial-gradient(55% 40% at 92% 6%,#1a18150b,#0000 72%);margin:0;font-size:16px;line-height:1.7}::selection{background:var(--cinnabar);color:var(--paper)}a{color:inherit;text-decoration:none}button{font:inherit;color:inherit}img,svg,canvas{max-width:100%;display:block}h1,h2,h3,h4,p,dl,dd,blockquote,figure,ol,ul{margin:0;padding:0}ol,ul{list-style:none}sub{font-size:.62em;line-height:0}:focus-visible{outline:2px solid var(--cinnabar);outline-offset:3px}.wrap{width:min(100%, var(--wrap));padding-inline:var(--gutter);margin-inline:auto}.mono{font-family:var(--mono);letter-spacing:.02em;font-size:.82em}.skip-link{z-index:100;background:var(--ink);color:var(--paper);padding:10px 16px;font-size:13px;transition:transform .2s;position:fixed;top:12px;left:12px;transform:translateY(-200%)}.skip-link:focus{transform:none}.progress{z-index:60;background:0 0;height:2px;position:fixed;inset:0 0 auto}.progress span{background:var(--cinnabar);transform-origin:0;height:100%;display:block;transform:scaleX(0)}.site-header{z-index:50;border-bottom:1px solid var(--line);-webkit-backdrop-filter:blur(12px);background:#f4efe6e6;position:sticky;top:0}.header-inner{justify-content:space-between;align-items:center;gap:32px;min-height:76px;display:flex}.brand{flex-shrink:0;align-items:center;gap:12px;display:inline-flex}.brand-mark{width:30px;height:30px;color:var(--ink)}.brand-mark svg{width:100%;height:100%}.brand-mark circle{color:var(--cinnabar);stroke:var(--cinnabar)}.brand-text{flex-direction:column;gap:2px;display:flex}.brand-name{font-family:var(--serif);letter-spacing:.08em;font-size:16px;font-weight:600;line-height:1.2}.brand-sub{font-family:var(--mono);letter-spacing:.16em;color:var(--muted);font-size:9px}.desktop-nav{align-items:center;gap:clamp(14px,2vw,26px);display:flex}.desktop-nav a{color:var(--muted);align-items:baseline;gap:5px;padding-block:6px;font-size:13px;transition:color .2s;display:inline-flex;position:relative}.desktop-nav a span{font-family:var(--mono);color:var(--muted-light);font-size:9px;transition:color .2s}.desktop-nav a:after{content:"";background:var(--cinnabar);height:1px;transition:right .25s;position:absolute;bottom:0;left:0;right:100%}.desktop-nav a:hover,.desktop-nav a.is-active{color:var(--ink)}.desktop-nav a:hover span,.desktop-nav a.is-active span{color:var(--cinnabar)}.desktop-nav a.is-active:after{right:0}.mobile-menu{display:none;position:relative}.mobile-menu summary{cursor:pointer;border:1px solid var(--line-strong);font-family:var(--mono);letter-spacing:.08em;border-radius:999px;padding:8px 12px;font-size:11px;list-style:none}.mobile-menu summary::-webkit-details-marker{display:none}.mobile-menu nav{background:var(--paper-soft);border:1px solid var(--line-strong);min-width:220px;padding:10px;position:absolute;top:calc(100% + 10px);right:0;box-shadow:0 18px 40px #1a18151f}.mobile-menu nav a{border-bottom:1px solid var(--line);gap:12px;padding:10px 12px;font-size:14px;display:flex}.mobile-menu nav a:last-child{border-bottom:0}.mobile-menu nav a span{font-family:var(--mono);color:var(--cinnabar);font-size:10px}.hero{border-bottom:1px solid var(--line);padding-block:clamp(56px,8vw,104px) clamp(64px,9vw,120px)}.hero-grid{grid-template-columns:minmax(0,1.25fr) minmax(0,.85fr);align-items:center;gap:clamp(40px,6vw,88px);display:grid}.hero-copy{max-width:660px}.eyebrow{font-family:var(--mono);letter-spacing:.18em;text-transform:uppercase;color:var(--muted);align-items:center;gap:10px;font-size:10px;display:flex}.eyebrow .idx{color:var(--cinnabar);letter-spacing:.08em}.hero h1{font-family:var(--serif);letter-spacing:-.04em;white-space:nowrap;margin-top:22px;font-size:clamp(3.6rem,9vw,8.4rem);font-weight:600;line-height:.94}.title-dot{color:var(--cinnabar)}.hero-tagline{font-family:var(--serif);letter-spacing:.01em;margin-top:clamp(22px,3vw,34px);font-size:clamp(1.55rem,3.2vw,2.5rem);font-weight:500;line-height:1.52}.hero-tagline em{color:var(--cinnabar);font-style:normal}.hero-lede{max-width:38em;color:var(--muted);margin-top:24px;font-size:1rem;line-height:1.95}.hero-meta{border-top:1px solid var(--line);flex-wrap:wrap;gap:18px 36px;margin-top:36px;padding-top:20px;display:flex}.hero-meta div{flex-direction:column;gap:3px;display:flex}.hero-meta dt{font-family:var(--mono);letter-spacing:.16em;color:var(--muted-light);font-size:9px}.hero-meta dd{color:var(--ink-soft);font-size:13px}.hero-scroll{font-family:var(--mono);letter-spacing:.12em;color:var(--cinnabar);align-items:center;gap:10px;margin-top:32px;font-size:11px;display:inline-flex}.hero-scroll span{animation:2.4s ease-in-out infinite nudge}@keyframes nudge{0%,to{transform:translateY(0)}50%{transform:translateY(4px)}}.hero-figure{justify-self:end;width:min(100%,460px)}.viewport{aspect-ratio:1/1.08;background:var(--paper-deep);border:1px solid var(--line-strong);position:relative;overflow:hidden}.viewport:after{content:"";z-index:3;pointer-events:none;opacity:.35;background:linear-gradient(90deg,#1a18150d 1px,#0000 1px) 0 0/25% 100%;position:absolute;inset:0}#latent-field{width:100%;height:100%;position:absolute;inset:0}.viewport-top,.viewport-bottom{z-index:4;font-family:var(--mono);letter-spacing:.1em;color:var(--muted);justify-content:space-between;gap:14px;font-size:9px;display:flex;position:absolute;left:16px;right:16px}.viewport-top{top:14px}.viewport-bottom{bottom:14px}.live{color:var(--cinnabar);align-items:center;gap:6px;display:inline-flex}.live i{background:var(--cinnabar);border-radius:50%;width:5px;height:5px;animation:2s ease-in-out infinite pulse}@keyframes pulse{0%,to{opacity:1}50%{opacity:.25}}.hero-figure figcaption{color:var(--muted-light);margin-top:12px;font-size:11px;line-height:1.7}.section{padding-block:var(--section-pad);border-bottom:1px solid var(--line);scroll-margin-top:90px}.section-tint{background:var(--paper-deep)}.section-head{max-width:860px;margin-bottom:clamp(40px,6vw,72px)}.section-head h2{font-family:var(--serif);letter-spacing:-.015em;margin-top:18px;font-size:clamp(2.3rem,4.8vw,4rem);font-weight:600;line-height:1.18}.section-head .lede{margin-top:20px}.lede{max-width:44em;color:var(--muted);font-size:1.02rem;line-height:1.95}.definition-grid{grid-template-columns:minmax(0,.82fr) minmax(0,1.18fr);align-items:start;gap:clamp(36px,6vw,80px);display:grid}.pull{border-left:1px solid var(--cinnabar);font-family:var(--serif);letter-spacing:.005em;padding-left:clamp(20px,3vw,32px);font-size:clamp(1.5rem,2.6vw,2.15rem);line-height:1.7;position:relative}.definition-body p{margin-bottom:18px;font-size:1rem;line-height:1.98}.definition-body p:last-child{margin-bottom:0}.definition-body strong{font-weight:600}.definition-scope{border-top:1px solid var(--line);color:var(--muted);padding-top:16px;font-size:.9rem!important}.formula-card{border-top:1px solid var(--ink);border-bottom:1px solid var(--line);margin-top:clamp(48px,7vw,80px);padding-top:32px}.formula{font-family:var(--serif);letter-spacing:.02em;font-size:clamp(1.35rem,2.4vw,1.9rem)}.formula-op{color:var(--cinnabar);padding-inline:.2em}.formula-cells{grid-template-columns:repeat(4,minmax(0,1fr));margin-top:30px;display:grid}.formula-cells>div{border-left:1px solid var(--line);padding:0 24px}.formula-cells>div:first-child{border-left:0;padding-left:0}.formula-cells .mono{color:var(--cinnabar-deep)}.formula-cells p{color:var(--muted);margin-top:10px;font-size:.84rem;line-height:1.8}.formula-note{border-top:1px solid var(--line);color:var(--muted);margin-top:28px;padding-top:18px;font-size:.85rem;line-height:1.8}.loop-track{border-top:1px solid var(--ink);grid-template-columns:repeat(5,minmax(0,1fr));display:grid}.loop-step{padding:24px 20px 8px 0;position:relative}.loop-step:before{content:"";background:var(--cinnabar);border-radius:50%;width:5px;height:5px;position:absolute;top:-3px;left:0}.loop-idx{font-family:var(--mono);letter-spacing:.12em;color:var(--muted-light);font-size:10px}.loop-step h3{font-family:var(--serif);margin-top:18px;font-size:1.42rem;font-weight:600}.loop-step p{color:var(--muted);margin-top:10px;font-size:.88rem;line-height:1.85}.loop-return{text-align:right;font-family:var(--serif);color:var(--cinnabar-deep);margin-top:36px;font-size:1.05rem}.loop-return span{margin-right:8px}.route-tabs{border-top:1px solid var(--ink);border-bottom:1px solid var(--line);grid-template-columns:repeat(4,minmax(0,1fr));display:grid}.route-tab{border:0;border-right:1px solid var(--line);text-align:left;cursor:pointer;background:0 0;align-items:flex-start;gap:12px;padding:20px 16px 20px 0;transition:background .2s;display:flex}.route-tab:last-child{border-right:0}.route-tab:hover{background:#a63b2a0a}.route-tab[aria-selected=true]{box-shadow:inset 0 -2px 0 var(--cinnabar);background:#a63b2a0e}.tab-letter{font-family:var(--serif);color:var(--muted-light);font-size:1.7rem;line-height:1;transition:color .2s}.route-tab[aria-selected=true] .tab-letter{color:var(--cinnabar)}.tab-text{flex-direction:column;gap:4px;display:flex}.tab-text strong{font-size:.92rem;font-weight:600}.tab-text small{font-family:var(--mono);letter-spacing:.08em;color:var(--muted-light);font-size:9px}.route-panel{padding-top:clamp(32px,5vw,56px);animation:.45s both panel-in}@keyframes panel-in{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}.route-head{border-bottom:1px solid var(--line);grid-template-columns:minmax(0,1.35fr) minmax(0,.65fr);align-items:end;gap:32px;padding-bottom:32px;display:grid}.route-kicker{font-family:var(--mono);letter-spacing:.14em;color:var(--cinnabar);font-size:10px}.route-head h3{font-family:var(--serif);margin-top:12px;font-size:clamp(1.9rem,3.4vw,2.8rem);font-weight:600;line-height:1.2}.route-q{font-family:var(--serif);color:var(--muted);margin-top:14px;font-size:1.08rem;line-height:1.8}.route-memory{border-left:1px solid var(--line-strong);font-family:var(--serif);color:var(--cinnabar-deep);text-align:right;padding-left:24px;font-size:1.02rem;line-height:1.8}.route-body{grid-template-columns:repeat(3,minmax(0,1fr));gap:0;display:grid}.route-block{padding:26px 26px 0 0}.route-block+.route-block{border-left:1px solid var(--line);padding-left:26px}.route-block h4{font-family:var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--muted-light);font-size:9.5px;font-weight:500}.route-steps{gap:12px;margin-top:16px;display:grid}.route-steps li{grid-template-columns:22px 1fr;gap:8px;font-size:.88rem;line-height:1.8;display:grid}.route-steps span{font-family:var(--mono);color:var(--cinnabar);padding-top:3px;font-size:9.5px}.chips{flex-wrap:wrap;gap:8px;margin-top:16px;display:flex}.chips li{border:1px solid var(--line-strong);border-radius:999px;padding:5px 10px;font-size:.8rem;line-height:1.4}.chips .chip-muted{color:var(--muted);border-style:dashed}.pros-cons{gap:14px;margin-top:16px;display:grid}.pros-cons li{color:var(--ink-soft);font-size:.88rem;line-height:1.8}.pros-cons span{font-family:var(--mono);letter-spacing:.12em;color:var(--cinnabar);font-size:9px;display:block}.pros-cons .con span{color:var(--muted-light)}.route-source{border-top:1px solid var(--line);font-family:var(--mono);color:var(--muted-light);margin-top:28px;padding-top:14px;font-size:9.5px;line-height:1.9}.route-source a,.tl-source a,.model-source a{border-bottom:1px solid var(--line-strong);transition:color .2s,border-color .2s}.route-source a:hover,.tl-source a:hover,.model-source a:hover{color:var(--cinnabar);border-color:var(--cinnabar)}.sandbox{border-top:1px solid var(--ink);border-bottom:1px solid var(--ink);background:var(--paper);grid-template-columns:minmax(0,1.5fr) minmax(0,.82fr);display:grid}.sandbox-stage{border-right:1px solid var(--line);flex-direction:column;gap:16px;padding:clamp(20px,3vw,32px);display:flex}.sandbox-hud{font-family:var(--mono);letter-spacing:.1em;color:var(--muted);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;font-size:9.5px;display:flex}.legend{gap:18px;display:flex}.legend li{align-items:center;gap:7px;display:flex}.legend i{width:16px;height:1px}.dot-true{background:var(--ink)}.dot-pred{background:var(--cinnabar);background-image:linear-gradient(to right, var(--cinnabar) 50%, transparent 50%);background-size:5px 1px}.canvas-wrap{aspect-ratio:16/10;background:var(--paper-soft);border:1px solid var(--line);position:relative}#horizon-canvas{width:100%;height:100%}.sandbox-caption{color:var(--muted-light);font-size:11px}.sandbox-controls{flex-direction:column;gap:26px;padding:clamp(20px,3vw,32px);display:flex}.readout{border-bottom:1px solid var(--line);padding-bottom:22px}.readout-label{font-family:var(--mono);letter-spacing:.14em;color:var(--muted);font-size:9.5px}.readout-value{font-family:var(--serif);letter-spacing:-.02em;margin-top:6px;font-size:clamp(2.8rem,5vw,4rem);font-weight:500;line-height:1.05;transition:color .2s}.readout-value[data-state=drift],.readout-value[data-state=diverge]{color:var(--cinnabar)}.readout-status{color:var(--muted);margin-top:6px;font-size:12px}.readout-status[data-state=drift]{color:var(--cinnabar-deep)}.readout-status[data-state=diverge]{color:var(--cinnabar)}.control-top{justify-content:space-between;align-items:baseline;gap:16px;display:flex}.control-top label{font-size:13px}.control-top output{font-family:var(--mono);color:var(--cinnabar);font-size:11px}input[type=range]{appearance:none;cursor:pointer;background:0 0;width:100%;height:20px;margin-top:16px}input[type=range]::-webkit-slider-runnable-track{background:var(--line-strong);height:1px}input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;background:var(--cinnabar);border:2px solid var(--paper);width:15px;height:15px;box-shadow:0 0 0 1px var(--cinnabar);border-radius:50%;margin-top:-7px}input[type=range]::-moz-range-track{background:var(--line-strong);height:1px}input[type=range]::-moz-range-thumb{background:var(--cinnabar);border:2px solid var(--paper);width:15px;height:15px;box-shadow:0 0 0 1px var(--cinnabar);border-radius:50%}.control-scale{font-family:var(--mono);color:var(--muted-light);justify-content:space-between;margin-top:8px;font-size:9px;display:flex}.btn{border:1px solid var(--ink);background:var(--ink);width:100%;color:var(--paper);letter-spacing:.04em;cursor:pointer;border-radius:999px;justify-content:center;align-items:center;padding:13px 22px;font-size:13px;transition:background .2s,color .2s;display:inline-flex}.btn:hover{background:var(--cinnabar);border-color:var(--cinnabar)}.demo-note{color:var(--muted);font-size:12px;line-height:1.85}.model-grid{border-top:1px solid var(--ink);grid-template-columns:repeat(2,minmax(0,1fr));display:grid}.model-card{border-bottom:1px solid var(--line);padding:30px 40px 30px 0}.model-card:nth-child(2n){border-left:1px solid var(--line);padding-left:40px;padding-right:0}.model-top{align-items:center;gap:12px;display:flex}.model-idx{font-family:var(--mono);color:var(--muted-light);font-size:10px}.tag{border:1px solid var(--line-strong);color:var(--cinnabar-deep);border-radius:999px;padding:3px 9px;font-size:11px;line-height:1.5}.model-year{font-family:var(--mono);color:var(--muted);margin-left:auto;font-size:10px}.model-card h3{font-family:var(--serif);margin-top:18px;font-size:clamp(1.5rem,2.4vw,1.95rem);font-weight:600;line-height:1.25}.status-tag{border:1px solid var(--cinnabar);font-family:var(--sans);letter-spacing:.04em;color:var(--cinnabar);vertical-align:middle;border-radius:2px;margin-left:8px;padding:2px 7px;font-size:10px;font-weight:400;display:inline-block}.model-org{font-family:var(--mono);letter-spacing:.04em;color:var(--muted);margin-top:6px;font-size:10px}.model-desc{margin-top:16px;font-size:.92rem;line-height:1.9}.model-note{color:var(--muted);margin-top:14px;font-size:.88rem;line-height:1.85}.model-note span{font-family:var(--mono);letter-spacing:.1em;color:var(--cinnabar);margin-right:8px;font-size:9px}.model-source{border-top:1px solid var(--line);font-family:var(--mono);color:var(--muted-light);margin-top:18px;padding-top:12px;font-size:9.5px}.editor-note{border-left:2px solid var(--cinnabar);background:#a63b2a0d;margin-top:36px;padding:22px 26px}.editor-note-label{font-family:var(--mono);letter-spacing:.12em;color:var(--cinnabar);font-size:9.5px}.editor-note p:last-child{font-family:var(--serif);margin-top:10px;font-size:1rem;line-height:1.9}.models-more{color:var(--muted);margin-top:30px;font-size:.86rem;line-height:1.9}.models-more span{color:var(--ink-soft);margin-inline:2px}.timeline-wrap{grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr);align-items:start;gap:clamp(40px,7vw,96px);display:grid}.timeline-intro{position:sticky;top:110px}.timeline-intro h2{font-family:var(--serif);letter-spacing:-.015em;margin-top:18px;font-size:clamp(1.9rem,3vw,2.7rem);font-weight:600;line-height:1.24}.timeline-note{border-top:1px solid var(--line);color:var(--muted-light);margin-top:24px;padding-top:16px;font-size:.82rem;line-height:1.85}.timeline{border-left:1px solid var(--line-strong)}.tl-item{border-bottom:1px solid var(--line);grid-template-columns:92px 1fr;gap:22px;padding:26px 0 26px 30px;display:grid;position:relative}.tl-item:last-child{border-bottom:0}.tl-item:before{content:"";background:var(--ink);border-radius:50%;width:6px;height:6px;position:absolute;top:36px;left:-3.5px}.tl-year{font-family:var(--serif);color:var(--ink);font-size:1.55rem;line-height:1.2}.tl-body h3{font-family:var(--serif);font-size:1.18rem;font-weight:600;line-height:1.5}.tl-body p{color:var(--muted);margin-top:8px;font-size:.9rem;line-height:1.85}.tl-source{font-family:var(--mono);color:var(--muted-light);font-size:9.5px;line-height:1.9}.tl-current{background:linear-gradient(90deg,#a63b2a0b,#0000 70%)}.tl-current:before{background:var(--cinnabar);box-shadow:0 0 0 3px #a63b2a26}.tl-current .tl-year{color:var(--cinnabar)}.challenge-grid{border-top:1px solid var(--ink);grid-template-columns:repeat(2,minmax(0,1fr));display:grid}.challenge-card{border-bottom:1px solid var(--line);padding:28px 40px 28px 0}.challenge-card:nth-child(2n){border-left:1px solid var(--line);padding-left:40px;padding-right:0}.challenge-idx{font-family:var(--mono);letter-spacing:.1em;color:var(--cinnabar);font-size:10px}.challenge-card h3{font-family:var(--serif);margin-top:14px;font-size:1.4rem;font-weight:600}.challenge-card p{color:var(--muted);margin-top:10px;font-size:.92rem;line-height:1.9}.challenge-quote{border-top:1px solid var(--ink);border-bottom:1px solid var(--ink);margin-top:48px;padding:40px 0}.challenge-quote p{max-width:48em;font-family:var(--serif);font-size:clamp(1.35rem,2.4vw,1.9rem);line-height:1.8}.refs-section .section-head{max-width:none}.reliability{font-family:var(--mono);color:var(--muted);flex-wrap:wrap;gap:10px 22px;margin-top:22px;font-size:10px;display:flex}.reliability b{color:var(--cinnabar);font-weight:500}.ref-list{border-top:1px solid var(--ink)}.ref-list li{border-bottom:1px solid var(--line);grid-template-columns:48px minmax(0,1fr) 32px;align-items:start;gap:18px;padding:20px 0;display:grid}.ref-idx{font-family:var(--mono);color:var(--muted-light);padding-top:3px;font-size:10px}.ref-body a{font-family:var(--serif);font-size:1.08rem;line-height:1.55}.ref-body a:hover{color:var(--cinnabar)}.ref-body p{font-family:var(--mono);color:var(--muted);margin-top:5px;font-size:10px;line-height:1.8}.ext{font-family:var(--mono);color:var(--cinnabar);font-size:.72em}.ref-badge{border:1px solid var(--line-strong);font-family:var(--mono);color:var(--cinnabar);border-radius:999px;justify-self:end;padding:1px 7px;font-size:10px}.ref-note{max-width:52em;color:var(--muted);margin-top:26px;font-size:.82rem;line-height:1.9}.site-footer{background:var(--ink);color:var(--paper);padding-block:64px 52px}.footer-inner{justify-content:space-between;align-items:flex-start;gap:48px;display:flex}.footer-title{font-family:var(--serif);letter-spacing:.04em;font-size:clamp(1.35rem,2.4vw,1.9rem);font-weight:600}.footer-en{font-family:var(--mono);letter-spacing:.12em;color:#f4efe67a;margin-top:4px;font-size:9.5px}.footer-note{color:#f4efe69e;max-width:46em;margin-top:20px;font-size:.8rem;line-height:1.9}.footer-top{font-family:var(--mono);letter-spacing:.1em;color:#f4efe6b8;border-bottom:1px solid #f4efe64d;flex-shrink:0;padding-bottom:3px;font-size:10px;transition:color .2s,border-color .2s}.footer-top:hover{color:#d97763;border-color:#d97763}html.js-reveal [data-reveal]{opacity:0;transition:opacity .7s,transform .7s cubic-bezier(.2,.7,.2,1);transform:translateY(18px)}html.js-reveal [data-reveal].is-in{opacity:1;transform:none}@media (width<=1024px){.hero-grid{grid-template-columns:1fr;gap:48px}.hero-figure{justify-self:start;width:min(100%,520px)}.desktop-nav{display:none}.mobile-menu{display:block}.formula-cells{grid-template-columns:repeat(2,minmax(0,1fr));gap:26px 0}.formula-cells>div:nth-child(3){border-left:0;padding-left:0}.route-body{grid-template-columns:1fr}.route-block{padding-right:0}.route-block+.route-block{border-left:0;border-top:1px solid var(--line);margin-top:24px;padding-top:24px;padding-left:0}.sandbox{grid-template-columns:1fr}.sandbox-stage{border-right:0;border-bottom:1px solid var(--line)}.model-grid,.challenge-grid{grid-template-columns:1fr}.model-card,.model-card:nth-child(2n),.challenge-card,.challenge-card:nth-child(2n){border-left:0;padding-left:0;padding-right:0}.timeline-wrap{grid-template-columns:1fr}.timeline-intro{position:static}}@media (width<=760px){.header-inner{min-height:68px}.brand-name{font-size:15px}.brand-sub{font-size:8px}.hero{padding-top:44px}.hero h1{font-size:clamp(3.2rem,16vw,5.4rem)}.hero-tagline{font-size:1.5rem}.hero-meta{gap:14px 26px}.definition-grid{grid-template-columns:1fr}.loop-track{border-top:0;border-left:1px solid var(--ink);grid-template-columns:1fr}.loop-step{padding:18px 0 18px 24px}.loop-step:before{top:28px;left:-3px}.loop-return{text-align:left}.route-tabs{grid-template-columns:repeat(2,minmax(0,1fr))}.route-tab{border-bottom:1px solid var(--line)}.route-tab:nth-child(2n){border-right:0}.route-tab:nth-last-child(-n+2){border-bottom:0}.route-head{grid-template-columns:1fr;gap:20px}.route-memory{border-left:0;border-top:1px solid var(--line);text-align:left;padding-top:16px;padding-left:0}.sandbox-controls{padding-top:24px}.tl-item{grid-template-columns:66px 1fr;gap:14px;padding-left:22px}.tl-year{font-size:1.2rem}.ref-list li{grid-template-columns:32px minmax(0,1fr) 24px;gap:12px}.footer-inner{flex-direction:column;gap:32px}.hero-meta div:nth-child(4){display:none}}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,:before,:after{transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}[data-reveal]{opacity:1;transform:none}}