:root{--ink:#171914;--paper:#f4f3ec;--muted:#6f7267;--lime:#dcfa82;--line:#d8d9ce;--accent:#dcfa82;--lavender:#cbbaf4}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:30px}body{margin:0;background:var(--paper);color:var(--ink);font-family:Arial,Helvetica,sans-serif;-webkit-font-smoothing:antialiased}button,a,input{-webkit-tap-highlight-color:transparent}button,input{font:inherit}button,a{touch-action:manipulation}button{cursor:pointer}a{color:inherit}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid #7970de;outline-offset:5px}header{height:104px;padding:0 5.2%;display:flex;align-items:center;gap:26px;border-bottom:1px solid var(--line)}.brand{font-size:38px;font-weight:800;letter-spacing:-3px;text-decoration:none;white-space:nowrap}.brand span{color:#8caa3f}.brand sup{font-size:0;letter-spacing:0;vertical-align:middle;margin-left:20px}.brand sup i{font-size:12px;font-style:normal;letter-spacing:-.2px;font-weight:500}.about-link{margin-left:auto;text-decoration:none;font-size:12px}.about-link span{font-size:23px;margin-left:16px}.soundless{width:40px;height:40px;border:1px solid var(--line);border-radius:50%;background:none;font-size:16px}.intro{position:relative;padding:74px 5.2% 54px}.eyebrow,.kicker{font-size:10px;font-weight:600;letter-spacing:1.6px}.eyebrow{display:flex;align-items:center;gap:9px}.live-dot{height:7px;width:7px;border-radius:100%;background:#7c9d34;box-shadow:0 0 0 5px #7c9d3412}h1{font-size:clamp(48px,6.6vw,102px);line-height:.99;font-weight:500;letter-spacing:-.065em;margin:30px 0 26px}em{font-family:Georgia,'Times New Roman',serif;font-weight:400}h1 em{letter-spacing:-.06em}.intro>p{font-size:17px;line-height:1.65;color:var(--muted);margin:0}.start{display:inline-flex;gap:40px;align-items:center;font-size:12px;text-decoration:none;margin-top:26px;border-bottom:1px solid #222;padding-bottom:9px}.start span{font-size:20px}.intro-index{position:absolute;right:5.2%;bottom:57px;font-size:9px;letter-spacing:1.4px;color:var(--muted)}.lab{margin:0 3%;border:1px solid var(--line);border-radius:19px;overflow:hidden;scroll-margin-top:20px}.tabs{display:grid;grid-template-columns:repeat(3,1fr);background:#e9e9df;border-bottom:1px solid var(--line)}.tabs button{background:none;border:0;border-right:1px solid var(--line);padding:23px 28px;text-align:left;font-size:13px;position:relative;min-height:66px}.tabs button:last-child{border:0}.tabs button span{font-family:monospace;font-size:10px;color:var(--muted);margin-right:14px}.tabs button b{float:right;font-size:18px;font-weight:400}.tabs button[aria-selected=true]{background:var(--lime)}.experiment{display:grid;grid-template-columns:42% 58%;min-height:610px}.controls{padding:42px clamp(24px,3.2vw,54px);background:#fbfcf5}.kicker{color:#76796a}h2{font-weight:500;letter-spacing:-1.5px;font-size:35px;line-height:1.1;margin:22px 0 15px}.controls>p{font-size:13px;color:var(--muted);line-height:1.65;min-height:43px}.presets{display:flex;flex-wrap:wrap;gap:6px;margin:23px 0 33px}.presets button{border:1px solid #d9dccb;background:transparent;border-radius:30px;padding:9px 11px;font-size:10px;min-height:34px}.presets button.active{background:#e9eddf;border-color:#b8c394}.range-group{margin:0 0 29px}.range-head{display:flex;justify-content:space-between;align-items:baseline;gap:10px}.range-head label{font-size:11px;color:#5b5f50;max-width:60%}.range-head output{font-size:28px;letter-spacing:-1px;font-variant-numeric:tabular-nums}.range-head div>span{font-size:11px;color:#5b5f50}input[type=range]{appearance:none;-webkit-appearance:none;width:100%;height:30px;margin:10px 0 1px;background:transparent;cursor:ew-resize;--fill:20%}input[type=range]::-webkit-slider-runnable-track{height:4px;background:linear-gradient(to right,#24291b var(--fill),#e0e4d4 var(--fill));border-radius:3px}input[type=range]::-moz-range-track{height:4px;background:#dfe4d1}input[type=range]::-moz-range-progress{height:4px;background:#24291b}input[type=range]::-webkit-slider-thumb{appearance:none;-webkit-appearance:none;width:23px;height:23px;background:var(--lime);border:6px solid #24291b;border-radius:50%;margin-top:-9px;box-shadow:0 0 0 4px #fbfcf5}input[type=range]::-moz-range-thumb{width:12px;height:12px;background:var(--lime);border:6px solid #24291b;border-radius:50%}.range-scale{display:flex;justify-content:space-between;font-size:9px;color:#818674}.nudge{display:flex;align-items:center;gap:13px;color:#757d64}.nudge>span{font-size:30px}.nudge p{font-size:11px;line-height:1.5;margin:0}.universe{isolation:isolate;position:relative;background:#11130f;overflow:hidden;color:#f4f5e9;min-height:610px;display:flex;align-items:center;justify-content:center}.universe:before{content:'';position:absolute;width:85%;aspect-ratio:1;background:radial-gradient(ellipse,#aac77916,transparent 68%);z-index:-1}.visual-top,.visual-bottom{position:absolute;left:28px;right:28px;display:flex;justify-content:space-between;gap:12px;font-size:8px;letter-spacing:1.3px;color:#a6ae91;z-index:2}.visual-top{top:27px}.visual-top i{display:inline-block;width:5px;height:5px;background:var(--accent);border-radius:50%;margin-right:6px}.visual-bottom{bottom:28px;font-size:7px;color:#899177}#particles{position:absolute;width:100%;height:100%;inset:0;z-index:-1}.orbit{position:absolute;border:1px solid #b8d8820d;border-radius:50%;pointer-events:none;z-index:-1;width:77%;aspect-ratio:1}.orbit-b{width:90%;border-style:dashed;transform:rotate(25deg)}.result{position:relative;text-align:center;width:100%;padding:50px 20px;pointer-events:none}.result>span:first-child{font-size:11px;color:#b8c3a1;letter-spacing:.3px}.big-number{font-size:clamp(70px,8.6vw,130px);font-weight:500;line-height:1.04;letter-spacing:-.075em;margin-top:13px;font-variant-numeric:tabular-nums;text-shadow:0 0 35px #10130f;white-space:nowrap}.result-unit{font-family:Georgia,serif;font-style:italic;font-size:36px;color:var(--accent)}.result-divider{width:25px;height:1px;background:#677155;margin:24px auto 18px}.result p{font-size:12px;line-height:1.8;color:#a8b097;margin:0}.result p strong{font-weight:500;color:#eaf0df}.result-bar{background:#edf0df;padding:22px 30px;display:flex;align-items:center;justify-content:space-between;gap:20px}.result-bar>div{display:flex;align-items:center;gap:14px}.result-symbol{font-size:33px}.result-bar p{font-size:12px;line-height:1.5}.result-bar strong{font-weight:600}.share,.dialog-primary{background:var(--ink);color:white;border:0;border-radius:8px;padding:16px 21px;font-size:11px;min-height:46px}.share span{margin-left:25px;font-size:17px}.perspective{padding:98px 7% 70px}.perspective-grid{display:grid;grid-template-columns:1fr 1fr;gap:80px;margin-top:12px}.perspective h2{font-size:clamp(38px,4.3vw,65px);letter-spacing:-2.5px;margin-top:15px}.perspective-grid p{color:var(--muted);font-size:15px;line-height:1.75;max-width:470px}.text-link{border:0;border-bottom:1px solid #4d5342;background:none;padding:12px 0 10px;font-size:12px;text-align:left}.text-link span{margin-left:20px}.principles{display:grid;grid-template-columns:repeat(3,1fr);gap:32px;margin-top:70px}.principles>div{border-top:1px solid var(--line);padding-top:26px}.principles span{font-size:26px;display:block;height:42px}.principles strong{font-size:13px;display:block;font-weight:500}.principles p{font-size:11px;color:var(--muted);line-height:1.6}.method{margin:0 7% 65px;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}summary{cursor:pointer;padding:23px 0;font-size:12px;list-style:none}summary::-webkit-details-marker{display:none}summary span{float:right;font-size:20px}.method[open] summary span{transform:rotate(45deg)}.method>div{max-width:780px;font-size:12px;line-height:1.8;color:var(--muted);padding-bottom:25px}footer{padding:32px 5.2%;border-top:1px solid var(--line);display:flex;align-items:center;gap:30px}footer>.brand{font-size:29px}footer>span{font-size:10px;color:var(--muted)}footer>span:last-child{margin-left:auto;font-size:8px;letter-spacing:1px}footer>button{background:none;border:0;text-decoration:underline;font-size:10px;color:var(--muted)}dialog{max-width:500px;width:calc(100% - 30px);border:0;padding:42px;background:var(--paper);border-radius:20px;color:var(--ink);max-height:90dvh;overflow:auto}dialog::backdrop{background:#10150ac9;backdrop-filter:blur(9px)}.close{position:absolute;right:14px;top:10px;background:none;border:0;font-size:28px;width:40px;height:40px}dialog h2{font-size:40px}dialog p{font-size:13px;color:var(--muted);line-height:1.7}.dialog-primary,.dialog-secondary{width:100%;margin-top:8px}.dialog-secondary{min-height:45px;border:1px solid var(--line);background:none;border-radius:8px;font-size:12px}.link-label{display:block;font-size:10px;margin:22px 0 7px}#share-url{width:100%;font-size:11px;padding:10px;border:1px solid var(--line);background:#fff}dialog .fine{font-size:10px}#share-status{min-height:20px;color:#455919}.skip{position:fixed;top:-100px;left:10px;padding:15px;background:var(--lime);z-index:99}.skip:focus{top:10px}.noscript{background:var(--lime);padding:20px}.photo-section{margin:75px 3% 0;background:#191923;color:#f2eef9;border-radius:20px;padding:50px;display:grid;grid-template-columns:1fr 1fr;gap:50px}.photo-section h2{font-size:clamp(40px,4.8vw,70px);letter-spacing:-3px}.photo-section .kicker{color:#c9b8f6}.photo-section p{color:#bbb4c9;font-size:13px;line-height:1.7}.photo-section .photo-note{font-size:10px;max-width:440px}.portrait-stage{position:relative;min-height:320px;display:flex;justify-content:center;align-items:center;background:radial-gradient(ellipse at center,#55467055,transparent 65%);border:1px solid #ffffff18;border-radius:14px;overflow:hidden}.portrait-stage svg{height:230px;opacity:.6}.portrait-stage img{width:100%;height:360px;object-fit:contain;display:none}.portrait-stage.has-photo img{display:block}.portrait-stage.has-photo svg{display:none}.portrait-badge{position:absolute;left:16px;top:16px;font-size:9px;letter-spacing:1px;color:#dfd1f9}.portrait-rings{position:absolute;width:240px;height:280px;border:1px solid #cfb2ff35;border-radius:50%;pointer-events:none}.portrait-stage.has-photo .portrait-rings{display:none}.photo-actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:20px}.photo-actions label,.photo-actions button{background:#cebbf4;border:0;color:#211a2d;padding:13px 16px;border-radius:6px;font-size:12px;cursor:pointer;min-height:44px}.photo-actions label:nth-child(2){background:#ffffff0d;color:#e6ddf3;border:1px solid #ffffff25}.photo-actions button{background:none;color:#ccc0df;border:1px solid #ffffff25}.file-input{position:absolute;width:1px;height:1px;opacity:0}.photo-actions label:focus-within{outline:3px solid white;outline-offset:3px}.decades{display:flex;gap:8px;margin:22px 0}.decades button{background:none;border:1px solid #ffffff26;border-radius:50px;padding:12px 16px;color:#d9cfe5;min-height:44px}.decades button[aria-pressed=true]{background:#cebbf4;color:#20182b;border-color:#cebbf4}.photo-state{border-top:1px solid #ffffff20;padding-top:14px;color:#cfc0e6!important}.section-link{color:#78619f;text-decoration:none;margin-left:22px;font-size:12px}.photo-section [hidden]{display:none!important}
@media(min-width:1550px){main,header,footer{max-width:1600px;margin-left:auto;margin-right:auto}}@media(max-width:1000px){.experiment{grid-template-columns:45% 55%}.controls{padding:30px 25px}.tabs button{padding:21px 18px}.big-number{font-size:90px}.rotate-label{display:none}.presets button{font-size:9px;padding:8px}.result-bar{padding:18px}.result-bar p{font-size:11px}.share{padding:14px}.share span{margin-left:9px}.photo-section{padding:35px;gap:25px}.intro-index{display:none}}@media(max-width:720px){header{height:78px;padding:0 6%;gap:12px}.brand{font-size:32px}.brand sup{margin-left:12px}.brand sup i{font-size:10px}.about-link{display:none}.soundless{margin-left:auto}.intro{padding:51px 6% 39px}h1{font-size:clamp(40px,9.8vw,70px);margin:26px 0 22px;line-height:1.04}.eyebrow{font-size:8px;letter-spacing:1.2px}.intro>p{font-size:14px}.start{font-size:11px}.lab{margin:0 4%;border-radius:13px}.tabs button{padding:15px 10px;font-size:10px;line-height:1.5;min-height:69px}.tabs button span{display:block;font-size:9px;margin-bottom:3px}.tabs button b{position:absolute;right:9px;top:15px;font-size:13px}.experiment{display:flex;flex-direction:column}.controls{padding:29px 23px 23px}h2{font-size:30px;line-height:1.13;margin-top:16px}.controls>p{min-height:0;font-size:12px;margin-bottom:16px}.presets{margin:16px 0 25px}.presets button{font-size:10px;padding:9px 12px}.range-group{margin-bottom:18px}.range-head output{font-size:25px}.nudge{display:none}.universe{min-height:405px}.big-number{font-size:clamp(65px,17vw,100px)}.result-unit{font-size:30px}.visual-top,.visual-bottom{left:19px;right:19px;font-size:7px}.visual-top{top:21px}.visual-bottom{bottom:20px}.result{padding:45px 10px}.result-divider{margin:17px auto}.result-bar{flex-direction:column;align-items:stretch;gap:5px;padding:14px 20px 20px}.result-symbol{font-size:28px}.result-bar>div{gap:10px}.share{width:100%;font-size:12px;display:flex;justify-content:space-between;align-items:center}.perspective{padding:60px 7% 36px}.perspective-grid{grid-template-columns:1fr;gap:0}.perspective h2{font-size:43px;margin-bottom:9px}.perspective-grid p{font-size:14px}.principles{grid-template-columns:1fr;gap:20px;margin-top:37px}.principles>div{padding-top:17px;display:grid;grid-template-columns:35px 1fr;gap:1px 12px}.principles span{grid-row:span 2}.principles strong{font-size:13px}.principles p{margin:5px 0}.method{margin-bottom:35px}footer{padding:24px 7%;display:grid;grid-template-columns:auto 1fr;gap:16px 25px}footer>span:last-child{margin:0}footer button{text-align:left;padding:0}dialog{padding:35px 25px}.photo-section{margin:45px 4% 0;padding:28px 23px;grid-template-columns:1fr;gap:24px}.photo-section h2{font-size:45px;letter-spacing:-2px}.portrait-stage{min-height:280px}.section-link{display:block;margin:18px 0 0}.decades{gap:5px}.decades button{padding:11px 13px}.photo-actions label{padding:13px 12px;font-size:11px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation:none!important;transition:none!important}}

.skip{clip-path:inset(50%);width:1px;height:1px;overflow:hidden}.skip:focus{clip-path:none;width:auto;height:auto;overflow:visible}.decades{flex-wrap:wrap}

/* Photo demo v2: visible above the calculators, stable image box and touch comparison. */
.photo-v2{margin-top:24px;gap:50px;align-items:center;padding:42px 48px}.photo-v2 h2{margin:23px 0;font-size:clamp(45px,5.4vw,78px)}.photo-v2 .decades{margin:24px 0 15px}.photo-v2 .decades button{padding:12px 17px}.photo-v2 .decades button:disabled{opacity:.4;cursor:not-allowed}.photo-right{min-width:0}.comparison{position:relative;width:100%;aspect-ratio:1;overflow:hidden;border-radius:15px;background:#2b253c;isolation:isolate}.comparison img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;display:block}.comparison #future-preview{clip-path:inset(0 0 0 var(--split))}.split-line{position:absolute;top:0;bottom:0;left:var(--split);width:2px;background:#fff;pointer-events:none;transform:translateX(-1px)}.split-line span{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);display:grid;place-items:center;width:42px;height:42px;border-radius:50%;background:#f5f1fb;color:#201729;font-size:24px;box-shadow:0 2px 15px #0006}.comparison #compare{position:absolute;inset:0;width:100%;height:100%;margin:0;opacity:0;cursor:ew-resize;z-index:5;touch-action:pan-y}.comparison:focus-within{outline:3px solid #dcfa82;outline-offset:4px}.before-label,.after-label{position:absolute;top:15px;background:#111b;padding:9px 11px;border-radius:5px;font-size:9px;letter-spacing:1px;pointer-events:none}.before-label{left:14px}.after-label{right:14px}.comparison-footer{display:flex;justify-content:space-between;margin-top:18px;font-size:9px;letter-spacing:1.3px;color:#cfc4de}.photo-download{display:inline-block;padding:14px 18px;background:#cebbf4;color:#21192c;border-radius:7px;text-decoration:none;font-size:12px}.photo-download[hidden]{display:none}.photo-v2 .compare-hint{color:#e3d5fa;font-size:12px}.own-photo{border-top:1px solid #ffffff22;margin-top:20px}.own-photo summary{font-size:12px;padding:16px 0}.own-photo p{font-size:11px}.photo-v2 .photo-state{font-size:11px;margin-bottom:0}.photo-v2 .photo-note{line-height:1.6}.mobile-compare-hint{display:none}.intro{padding-top:60px}.intro h1{font-size:clamp(45px,5.5vw,78px)}
@media(max-width:720px){.photo-v2{padding:20px;margin:14px 4% 0;gap:24px}.photo-v2 .photo-right{order:-1}.photo-v2 h2{font-size:43px;margin:16px 0}.photo-v2 .photo-copy>p{font-size:13px}.photo-v2 .decades{gap:5px;flex-wrap:nowrap}.photo-v2 .decades button{padding:11px 10px;font-size:12px;flex:1}.photo-v2 .decades button:first-child{font-size:10px}.comparison{border-radius:10px}.comparison-footer{font-size:8px;margin-top:13px}.mobile-compare-hint{display:block!important;font-size:10px!important;margin-bottom:0}.photo-v2 .photo-state{font-size:10px}.before-label,.after-label{font-size:7px;padding:7px;top:10px}.before-label{left:9px}.after-label{right:9px}.intro{padding-top:45px}}

.decades button small{display:block;font-size:8px;margin-top:4px;opacity:.75}.photo-v2 .decades button{min-width:53px}

.photo-v2 .decades{display:flex;gap:5px}.photo-v2 .decades button{min-width:0;flex:1;padding:12px 7px}.photo-v2 .decades button:disabled{opacity:.45;cursor:not-allowed}