:root{--ink:#203143;--muted:#687782;--line:#dce3e5;--blue:#286f92;--green:#2c7b78;--paper:#fafbf9;--red:#bf5a46;--orange:#ca8c47}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:95px}body{margin:0;color:var(--ink);background:var(--paper);font:14px/1.8 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}a{color:inherit;text-decoration:none}button,input{font:inherit}button{cursor:pointer}button:focus-visible,a:focus-visible,canvas:focus-visible{outline:3px solid #72b2d0;outline-offset:4px}input:focus-visible{outline:2px solid #72b2d0}button{color:inherit}button:disabled{cursor:default;opacity:.5}[hidden]{display:none!important}.top{max-width:1240px;margin:auto;min-height:78px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 30px;gap:20px}.brand{font-size:17px;font-weight:650;white-space:nowrap}.brand span{color:var(--blue)}.brand i,footer i{font-style:normal;color:#b3c0c6;margin:0 13px}.brand b{font-weight:500;color:var(--green)}.top nav{display:flex;gap:25px;font-size:12px;color:var(--muted)}.top nav a:hover{color:var(--blue)}.wrap{max-width:1240px;margin:auto;padding:0 30px}.hero{display:grid;grid-template-columns:1fr 250px;gap:45px;padding:55px 0 35px}.eyebrow,.kicker{font:10px/1.6 ui-monospace,monospace;letter-spacing:1.7px;color:var(--blue);margin-bottom:12px}h1{font-size:clamp(30px,4.4vw,47px);line-height:1.35;letter-spacing:-.7px;font-weight:650;margin:0 0 18px}.hero p{color:var(--muted);margin:0;font-size:14px}.hero-aside{align-self:center;border-left:1px solid var(--line);padding-left:30px}.hero-aside>span{font-size:11px;color:var(--muted)}.hero-aside strong{display:block;font-size:25px;font-weight:500;margin:6px 0}.hero-aside p{font-size:12px}.hero-aside a{display:block;color:var(--blue);font-size:11px;margin-top:20px}.route{display:flex;align-items:center;gap:24px;border-top:1px solid var(--line);padding:14px 0 20px;font-size:12px}.route>span{color:var(--muted);white-space:nowrap}.route p{margin:0}.route i{font-style:normal;color:#97adb7;margin:0 13px}.steps{position:sticky;top:0;z-index:20;background:#fafbf9f5;backdrop-filter:blur(8px);display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin-bottom:27px}.steps button{display:flex;align-items:center;gap:17px;padding:17px 20px;background:transparent;border:0;border-right:1px solid var(--line);text-align:left;border-bottom:3px solid transparent}.steps button:last-child{border-right:0}.steps button[aria-selected=true]{border-bottom-color:var(--green);background:#eef4f2}.steps b{font:20px ui-monospace,monospace;color:#95a9b2;font-weight:400}.steps button[aria-selected=true] b{color:var(--green)}.steps span{font-size:14px;font-weight:600}.steps small{display:block;font:10px/1.8 ui-monospace,monospace;color:var(--muted);font-weight:400;margin-top:4px}.lab{display:grid;grid-template-columns:232px minmax(0,1fr);gap:27px;align-items:start}.controls{background:white;border:1px solid var(--line);border-radius:9px;padding:18px 19px;position:sticky;top:110px;max-height:calc(100vh - 130px);overflow:auto;scrollbar-width:thin}.panel-title{display:flex;justify-content:space-between;font-size:13px;font-weight:600;align-items:center}.small{font-size:11px;line-height:1.8;color:var(--muted)}.controls>.small{margin:6px 0 19px}.controls label{font-size:11px;display:block;margin-top:19px;color:#526673}.controls output{display:block;color:var(--ink);font:17px/1.7 ui-monospace,monospace;margin-top:2px}input[type=range]{width:100%;accent-color:var(--green);height:15px;margin:6px 0 0}.control-group{border-top:1px solid var(--line);margin-top:20px}.presets{display:flex;gap:6px;margin-top:15px}.presets button,.wide-button{background:#f6f8f7;border:1px solid var(--line);border-radius:4px;font-size:10px;padding:7px 8px}.wide-button{width:100%;margin-top:14px;font-size:11px;color:var(--blue)}.text-button{border:0;background:none;color:var(--blue);font-size:11px;padding:3px}.control-note{margin-top:22px;padding-top:16px;border-top:1px solid var(--line);font-size:10px;color:var(--muted);line-height:1.85}.control-note b{font-size:10px;color:#4c6270}.control-note p{margin:6px 0}.stage-heading{margin-bottom:20px}.stage-heading .eyebrow{margin-bottom:5px}h2{font-size:23px;font-weight:600;letter-spacing:-.3px;margin:0 0 8px;line-height:1.6}.stage-heading p{font-size:12px;color:var(--muted);margin:0;line-height:1.9}.figure-card{border:1px solid var(--line);background:white;border-radius:9px;overflow:hidden}.figure-heading{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:16px 19px;border-bottom:1px solid var(--line);font-size:12px}.figure-heading strong{font-weight:600}.figure-heading>span{font:10px ui-monospace,monospace;color:var(--muted)}canvas{display:block;width:100%;height:auto;touch-action:pan-y}.legend{display:flex;flex-wrap:wrap;gap:8px 18px;padding:11px 17px 15px;border-top:1px solid #edf0ef;color:var(--muted);font-size:10px;line-height:1.7}.legend i{display:inline-block;width:7px;height:7px;border-radius:50%;margin-right:6px}.metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:7px;overflow:hidden;margin:15px 0 28px}.metric{background:var(--paper);padding:13px 16px}.metric span{display:block;font-size:10px;color:var(--muted)}.metric strong{font:22px/1.7 ui-monospace,monospace;font-weight:400;color:var(--blue)}.metric small{font-size:10px;color:var(--muted);margin-left:5px}.explain-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}.note h3{font-size:16px;font-weight:600;margin:5px 0 13px}.note .kicker{font-size:9px;letter-spacing:1px;margin:0}.note p{font-size:12px;line-height:1.95;color:#576b76;margin:12px 0}.equation{font:12px/2.1 ui-monospace,"SFMono-Regular",Consolas,"Microsoft YaHei",monospace;background:#edf3f3;border-left:2px solid #76a6a5;padding:14px 17px;overflow-wrap:anywhere;margin:15px 0;color:#2e5868}.equation b{font-weight:600;color:var(--green)}.callout{font-size:11px;line-height:1.9;border-left:2px solid #c1d1d6;padding:7px 12px;color:var(--muted);margin:15px 0}.readout{background:#f1f5f5;padding:10px 13px;color:var(--blue)!important;font-size:11px!important}.triangle{width:100%;height:190px}.source-details{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:17px 0;margin-top:25px}summary{cursor:pointer;font-size:12px;color:var(--blue);font-weight:500}summary:hover{text-decoration:underline}.original-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:20px}figure{margin:0}img{max-width:100%;height:auto;display:block;margin:auto}.original-grid figure{padding:15px;border:1px solid #e6ecee;background:white;border-radius:6px;align-self:start}.original-grid img{max-height:380px;object-fit:contain}.original-grid .full{grid-column:1/-1}.original-grid .full img{max-height:470px}figcaption{font-size:10px;color:var(--muted);line-height:1.8;margin-top:13px}.next{display:block;border:0;background:var(--green);color:white;font-size:12px;margin:25px 0 0 auto;padding:12px 20px;border-radius:5px}.segmented{display:flex;gap:2px;padding:2px;background:#eff3f3;border-radius:4px}.segmented button{font-size:10px;border:0;background:transparent;padding:5px 9px;border-radius:3px}.segmented button[aria-pressed=true]{background:white;color:var(--blue);box-shadow:0 1px 3px #0001}.insight{border-left:2px solid var(--orange);background:#f4f1eb;padding:17px 21px;margin-top:21px}.insight b{font-size:12px}.insight p{font-size:11px;line-height:1.95;color:var(--muted);margin:8px 0 0}.budget{border:1px solid var(--line);background:white;border-radius:8px;margin-top:22px;overflow:hidden}.badge{color:var(--green)!important;background:#edf4f1;border:1px solid #dce9e3;padding:4px 8px;border-radius:4px;white-space:nowrap;font-size:9px!important}.figure-heading p{margin:3px 0 0}.budget-metrics{display:grid;grid-template-columns:repeat(3,1fr);padding:8px}.budget-metrics .metric{background:white}.budget-metrics .metric strong{font-size:25px}.power-bars{padding:0 24px 20px}.power-row{display:grid;grid-template-columns:100px 1fr 85px;align-items:center;gap:12px;font:10px/1.8 ui-monospace,monospace;margin:9px 0}.power-track{height:10px;background:#f0f3f3;border-radius:2px;overflow:hidden}.power-track i{display:block;height:100%;background:var(--blue);min-width:1px}.power-row:last-child .power-track i{background:var(--orange)}.power-row:last-child span{color:#966c35}.table-scroll{width:100%;overflow:auto}table{width:100%;border-collapse:collapse;text-align:left;font-size:11px}th{font-size:10px;font-weight:500;background:#f0f4f4;color:#697f8b;padding:11px 15px;white-space:nowrap}td{padding:11px 15px;border-top:1px solid #e6ecee;white-space:nowrap}tbody tr:hover{background:#fafcfb}.budget>details{margin:18px 24px;font-size:11px;color:var(--muted)}.budget>details p{line-height:1.95}.original-result{margin-top:35px;border-top:1px solid var(--line);padding-top:25px}.original-result h3{font-size:20px;margin:5px 0 10px}.original-result figure{background:white;border:1px solid var(--line);border-radius:8px;padding:23px}.result-note{font-size:12px;line-height:1.95;color:var(--muted);border-left:2px solid var(--red);padding:8px 15px}.source{margin:48px 0 35px;border-top:1px solid var(--line);padding-top:25px}.source h2{font-size:20px}.source p{font-size:12px;color:var(--muted);line-height:1.95}.source-link{font-size:11px;color:var(--blue)}.source table{margin:20px 0}.source td{white-space:normal}.source th:first-child{width:17%}.source th:nth-child(2){width:33%}footer{padding:22px 0 35px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:20px;font-size:11px;color:var(--muted)}footer a{color:var(--blue)}noscript p{padding:20px;text-align:center}@media(min-width:1000px){.stages{min-height:1000px}}@media(max-width:900px){.lab{grid-template-columns:200px minmax(0,1fr);gap:18px}.controls{padding:16px}.explain-grid{grid-template-columns:1fr;gap:20px}.note .triangle{height:210px}.hero{grid-template-columns:1fr 200px;gap:20px}.hero-aside{padding-left:20px}.steps button{padding:15px 12px;gap:10px}.steps span{font-size:12px}.metric{padding:12px}.metric strong{font-size:19px}}@media(max-width:650px){html{scroll-padding-top:90px}.top{padding:0 18px;min-height:64px}.top nav{gap:12px;font-size:10px}.top nav a:nth-child(-n+3){display:none}.wrap{padding:0 18px}.hero{grid-template-columns:1fr;padding:30px 0 22px;gap:20px}.hero h1{font-size:32px}.hero p{font-size:12px}.desktop{display:none}.hero-aside{display:none}.route{align-items:flex-start;gap:12px;padding:13px 0;font-size:10px}.route p{line-height:1.9}.route i{margin:0 4px}.steps{margin-bottom:17px}.steps button{gap:7px;align-items:start;padding:12px 7px}.steps b{font-size:14px;line-height:1.8}.steps span{font-size:10px}.steps small{font-size:8px;line-height:1.5;margin-top:5px}.lab{display:block}.controls{position:static;max-height:none;display:grid;grid-template-columns:1fr 1fr;gap:0 20px;padding:15px;margin-bottom:24px}.panel-title,.controls>.small,.control-group,.control-note,.presets{grid-column:1/-1}.controls>.small{margin-bottom:0}.controls>label{margin-top:13px}.controls>input{align-self:end}.controls output{font-size:14px}.control-group{display:grid;grid-template-columns:1fr 1fr;gap:0 20px;margin-top:14px;padding-top:3px}.control-group>button,.control-group>.small{grid-column:1/-1}.control-group label{margin-top:13px}.control-note{margin-top:15px;padding-top:10px}.control-note p{display:inline;font-size:9px}.control-note b{display:block;margin-bottom:4px}.presets{margin-top:9px}.control-group .small{font-size:9px}.stage-heading h2{font-size:21px}.stage-heading p{font-size:11px}.figure-heading{padding:12px;font-size:10px;gap:7px}.figure-heading>span{font-size:9px}.segmented button{font-size:9px;padding:4px 7px}.legend{font-size:9px;padding:10px 12px;gap:5px 12px}.metrics{margin-top:12px}.metric{padding:10px}.metric strong{font-size:17px}.metric span{font-size:9px}.metric small{font-size:8px;margin-left:3px}.original-grid{grid-template-columns:1fr}.budget-metrics .metric strong{font-size:18px}.power-row{grid-template-columns:76px 1fr 70px;font-size:9px;gap:7px}.power-bars{padding:0 16px 15px}.badge{font-size:8px!important}.source{margin-top:30px}.source table{font-size:10px}.source th,.source td{padding:9px}footer{font-size:10px;gap:12px;flex-wrap:wrap}.source .eyebrow{margin-bottom:5px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
