:root{--ink:#183d39;--muted:#60716a;--paper:#f5f4ed;--line:#d8ded5;--accent:#d9f37c;--danger:#ad342e}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:Arial,Helvetica,sans-serif;-webkit-font-smoothing:antialiased}button,input,select{font:inherit}button,a,input,select,summary{-webkit-tap-highlight-color:transparent}button{cursor:pointer}a{color:inherit;text-underline-offset:4px}header,main,footer{max-width:1180px;margin:auto}header{height:88px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);font-size:12px}header>a{text-decoration:none}.brand{font-size:13px;font-weight:800;letter-spacing:1.5px;display:flex;align-items:center;gap:10px}.mark{display:grid;place-items:center;width:30px;height:30px;background:var(--ink);color:var(--accent);font-size:24px;border-radius:50%}.brand-small{font-weight:400;color:var(--muted);font-size:10px}.title-row{display:flex;align-items:center;justify-content:space-between;margin:32px 0 24px;gap:20px}h1{font-size:clamp(23px,3vw,36px);letter-spacing:-1.3px;margin:0;line-height:1.15;font-weight:600}.tag{font-size:10px;letter-spacing:1px;border:1px solid #aab9aa;border-radius:4px;padding:8px;white-space:nowrap}form{display:grid;grid-template-columns:1.15fr 1fr;border:1px solid #b9c5b8;border-radius:18px;overflow:hidden;background:#fffef9;box-shadow:0 15px 35px #183d3909}.input-panel,.result-panel{padding:30px}.panel-heading{display:flex;justify-content:space-between;align-items:center;margin-bottom:25px;min-height:23px}.eyebrow,.section-index{font-size:10px;letter-spacing:1.7px;font-weight:700}.text-button{background:none;border:0;color:var(--muted);font-size:12px;padding:5px}label{display:flex;flex-direction:column;gap:9px;font-size:12px;font-weight:600;min-width:0}select,input{width:100%;min-width:0;border:1px solid #c9d1c5;border-radius:7px;background:#fffefb;color:var(--ink);height:49px;padding:0 12px;font-size:15px;outline:none}input{font-variant-numeric:tabular-nums}input:focus,select:focus{border-color:var(--ink);box-shadow:0 0 0 3px #d9f37c75}:focus-visible{outline:3px solid #8ba43a;outline-offset:3px}.game-row{display:grid;grid-template-columns:minmax(0,1fr) 32px minmax(0,1fr);gap:8px}.game-row label{font-size:12px}.game-row select{font-size:13px;padding-left:8px}#swap{border:0;background:none;color:var(--ink);align-self:end;height:49px;font-size:23px;border-radius:6px}.value-row{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:22px}.dpi{margin-top:18px}#error{min-height:18px;font-size:12px;color:var(--danger);margin:13px 0 8px}input[aria-invalid=true]{border-color:var(--danger)}.convert{display:flex;justify-content:space-between;align-items:center;background:var(--ink);color:#fff;border:0;border-radius:7px;padding:0 18px;width:100%;height:49px;font-size:14px;font-weight:600}.convert span{font-size:22px;color:var(--accent)}button{transition:background .15s,transform .15s}button:active{transform:translateY(1px)}.convert:hover{background:#28554d}.hint{font-size:11px;color:var(--muted);margin:12px 0 0}.result-panel{background:var(--ink);color:#f7f9ec;min-width:0}.result-panel .panel-heading{color:#c6d8ba}#state{font-size:9px;letter-spacing:1px;display:flex;align-items:center;gap:6px}#state:before{content:'';width:5px;height:5px;background:var(--accent);border-radius:50%}.target-name{font-size:13px;margin:0 0 7px;color:#d4dfcf}#result{display:block;font-size:clamp(38px,4.6vw,63px);letter-spacing:-2px;line-height:1.1;font-variant-numeric:tabular-nums;overflow-wrap:anywhere}.copy-main{display:flex;justify-content:space-between;width:100%;background:var(--accent);color:var(--ink);border:0;border-radius:6px;padding:12px 14px;margin-top:19px;font-size:12px;font-weight:700}.distance{border-top:1px solid #ffffff2a;border-bottom:1px solid #ffffff2a;margin-top:24px;padding:16px 0;display:flex;justify-content:space-between;align-items:center}.distance>div{display:flex;align-items:center;gap:11px;font-size:11px;line-height:1.6}.distance strong{font-size:13px;font-weight:500}.orbit{font-size:37px;color:var(--accent);line-height:1}.distance-caption{font-size:8px;letter-spacing:1.2px;color:#c2d4bc}.metrics{display:grid;grid-template-columns:1fr 1fr;gap:17px 24px;margin-top:20px}.metrics>div{min-width:0}.metrics>div>span{font-size:10px;color:#c6d6c0}.metrics>div>div{display:flex;align-items:center;justify-content:space-between;gap:5px;margin-top:4px}.metrics output{font-size:20px;font-variant-numeric:tabular-nums;overflow-wrap:anywhere}.metrics button{border:0;background:none;color:#c6d6c0;padding:5px 7px;min-height:30px}.metrics button:hover{background:#ffffff14}#feedback{font-size:10px;color:#d5e2c9;margin:19px 0 0;min-height:13px}button:disabled{opacity:.45;cursor:not-allowed}.under-tool{display:flex;align-items:center;gap:24px;font-size:9px;letter-spacing:1.2px;color:var(--muted);padding:21px 2px}.under-tool>a{margin-left:auto;letter-spacing:0;font-size:11px}.explain{display:grid;grid-template-columns:230px minmax(0,1fr);border-top:1px solid var(--line);padding:43px 0}.section-index{padding-top:7px;color:var(--muted)}h2{font-size:27px;letter-spacing:-.7px;font-weight:500;margin:0 0 18px}p{line-height:1.7}.explain p{font-size:14px;color:var(--muted);max-width:72ch;margin:12px 0}.formula{font-family:Consolas,monospace;font-size:12px;line-height:1.9;border-left:3px solid #9db658;background:#edf0e4;padding:17px 20px;overflow-wrap:anywhere;margin:23px 0}.game-list{display:grid;grid-template-columns:repeat(3,1fr);gap:0 18px;margin-top:24px}.game-list div{border-top:1px solid var(--line);padding:13px 0;font-size:12px;display:flex;flex-direction:column;gap:6px}.game-list small{font-size:10px;color:var(--muted);font-family:Consolas,monospace}details{border-top:1px solid var(--line);padding:18px 0}summary{font-size:14px;cursor:pointer;line-height:1.5}footer{display:flex;justify-content:space-between;padding:26px 0;border-top:1px solid var(--line);font-size:9px;letter-spacing:1px;color:var(--muted)}@media(max-width:1240px){header,main,footer{margin-left:30px;margin-right:30px}}@media(max-width:760px){header,main,footer{margin-left:18px;margin-right:18px}header{height:65px}.brand{font-size:10px;gap:7px;letter-spacing:1px}.brand-small{display:none}header>a:last-child{font-size:10px}.title-row{margin:25px 0 19px;display:block}h1{font-size:27px;max-width:340px;letter-spacing:-.8px}.tag{display:inline-block;margin-top:12px;font-size:8px;padding:5px 7px}form{grid-template-columns:1fr;border-radius:12px}.input-panel,.result-panel{padding:21px}.panel-heading{margin-bottom:18px}.value-row{gap:12px;margin-top:17px}select,input{height:46px;font-size:16px}#swap{height:46px}.game-row{grid-template-columns:minmax(0,1fr) 25px minmax(0,1fr);gap:3px}.game-row select{font-size:12px;padding-left:6px}.hint{margin-top:8px}#error{margin:10px 0 5px;min-height:16px}.result-panel .panel-heading{margin-bottom:12px}#result{font-size:48px}.distance{margin-top:20px}.metrics{gap:16px}.metrics button{min-height:44px;min-width:44px}.under-tool{gap:12px;flex-wrap:wrap;line-height:1.5;font-size:8px;padding:16px 0}.under-tool>a{margin-left:0}.explain{display:block;padding:28px 0}.section-index{margin-bottom:18px}h2{font-size:25px}.game-list{grid-template-columns:1fr 1fr}.formula{padding:12px;font-size:11px}footer{gap:20px;line-height:1.6}.distance-caption{font-size:7px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}
/* Review round 2: clearer mobile controls and larger touch targets. */
.copy-main{min-height:44px}
@media(max-width:760px){.text-button{min-height:44px;min-width:44px}.game-row{grid-template-columns:minmax(0,1fr) 44px minmax(0,1fr);gap:3px}#swap{width:44px}.game-row select{font-size:12px}.value-row select{font-size:14px;padding-left:8px}.panel-heading{margin-bottom:10px}.input-panel{padding-top:12px;padding-bottom:18px}}

/* Informational pages and accessible footer navigation. */
footer{flex-wrap:wrap;align-items:center}footer nav{display:flex;flex-wrap:wrap;gap:8px 18px}footer nav a{display:inline-flex;align-items:center;min-height:44px;font-size:12px;letter-spacing:0}.info-page{padding-top:38px;padding-bottom:44px;max-width:850px;min-height:60vh;overflow-wrap:anywhere}.info-page h1{margin-bottom:20px}.info-page h2{margin-top:32px;margin-bottom:12px;font-size:23px}.info-page p{font-size:16px;color:var(--muted)}.updated{font-size:13px!important}@media(max-width:760px){footer{display:block}footer nav{margin-top:12px}.info-page{padding-top:28px}}

/* Mobile footer: separate full-width touch targets. */
@media(max-width:760px){footer nav{display:flex;flex-direction:column;flex-wrap:nowrap;gap:10px;width:100%}footer nav a{display:flex;width:100%;min-height:48px;padding:12px 16px;border:1px solid var(--line);border-radius:8px;background:#fffef9;font-size:14px;text-decoration:none}}