:root{font-family:-apple-system,BlinkMacSystemFont,"Noto Sans JP",sans-serif;color:#203941;background:#f7f7f2;line-height:1.8;font-size:16px;--teal:#146d69;--mint:#dceee7;--muted:#5c7379;--line:#d8e2df}*{box-sizing:border-box}body{margin:0}a{color:var(--teal)}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #e5a22d;outline-offset:4px}header,footer{max-width:1280px;margin:auto;display:flex;justify-content:space-between;align-items:center;gap:20px;padding:24px 36px}header{border-bottom:1px solid var(--line)}header>span,footer>span:last-child{font-size:12px;color:var(--muted)}.brand{color:#203941;font-size:15px;letter-spacing:.03em;font-weight:700;text-decoration:none}.brand b{color:var(--teal)}main{max-width:1180px;margin:auto;padding:0 36px}.skip{position:absolute;top:-80px;background:#fff;padding:12px;z-index:20}.skip:focus{top:0}.hero{display:grid;grid-template-columns:1.45fr 1fr;gap:64px;align-items:center;padding:72px 0 64px}.eyebrow{font-size:11px;font-weight:700;letter-spacing:.17em;color:var(--teal);margin:0 0 12px}.hero h1{font-size:clamp(32px,4.2vw,52px);font-weight:750;line-height:1.5;letter-spacing:-.04em;margin:14px 0 22px}h1 em{font-style:normal;color:var(--teal);background:linear-gradient(transparent 72%,#d9e9bc 72%)}.lead{font-size:16px;color:#526a70;line-height:2}.primary-link{display:inline-flex;align-items:center;justify-content:space-between;gap:40px;border-radius:8px;background:var(--teal);color:#fff;text-decoration:none;padding:14px 20px;font-size:14px;font-weight:700;margin-top:12px}.fine{font-size:12px;line-height:1.8;color:var(--muted)}.hero-card{background:#e6eee7;border:1px solid #d6e3d9;border-radius:22px;padding:30px;transform:rotate(2deg)}.mini-label{font-size:11px;letter-spacing:.05em;color:var(--muted);font-weight:700}.distance-stack>div{display:flex;align-items:center;justify-content:space-between;gap:10px;border-bottom:1px solid #c9d8d0;padding:13px 0}.distance-stack strong{font-size:40px;line-height:1.3;letter-spacing:-.04em;color:#215d57}.distance-stack strong span{font-size:14px;margin-left:5px;letter-spacing:0}.distance-stack>div>span{font-size:13px}.hero-card p{font-size:13px;margin:22px 0 0}.steps{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.steps a{padding:18px 8px;font-size:12px;text-decoration:none;text-align:center}.steps b{display:inline-block;margin-right:6px;color:#81958e}.section{padding:60px 0;border-bottom:1px solid var(--line);scroll-margin-top:24px}.section-heading{display:flex;gap:18px;align-items:center;margin-bottom:24px}.step-number{font-family:Georgia,serif;color:#82968a;font-size:36px;font-style:italic}.section-heading .eyebrow{margin:0 0 3px;font-size:10px}h2{font-size:clamp(23px,2.5vw,30px);margin:0;line-height:1.5;letter-spacing:-.03em}h3{line-height:1.6}p{margin:12px 0}.baseline-grid{display:grid;grid-template-columns:1.15fr 1fr;gap:40px}.baseline-grid>div>p:first-child{margin-top:0}.baseline-grid p{font-size:14px}.baseline-setting{padding:25px;border:1px solid var(--line);background:#fff;border-radius:14px;align-self:start}.baseline-setting label{display:flex;justify-content:space-between;gap:12px;font-size:13px;font-weight:600}.baseline-setting output{font-size:18px;color:var(--teal);white-space:nowrap}input[type=range]{display:block;width:100%;height:30px;margin:17px 0 3px;accent-color:var(--teal);cursor:ew-resize}.scale-labels{display:flex;justify-content:space-between;color:var(--muted);font-size:10px}.section-intro{font-size:14px}details{border-top:1px solid var(--line);padding:18px 0 0;margin-top:24px;font-size:13px}summary{cursor:pointer;font-weight:650;color:#345d60;min-height:30px}details p{max-width:900px}.scene-buttons{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin:24px 0 18px}.scene-buttons button{padding:14px 10px;border:1px solid #cbd9d4;border-radius:10px;background:transparent;color:#36575c;font-size:15px;font-weight:650;min-height:78px}.scene-buttons span{display:block;font-size:10px;font-weight:400;margin-top:3px}.scene-buttons button[aria-pressed=true]{background:#176e69;color:white;border-color:#176e69}.lab{display:grid;grid-template-columns: .95fr 1.2fr;gap:22px;align-items:start}.controls{padding:6px 25px 24px;background:#fff;border:1px solid var(--line);border-radius:16px}.control-block{padding:23px 0;border-bottom:1px solid #e6ece9}.control-title{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.control-index{width:21px;height:21px;display:grid;place-content:center;border-radius:50%;background:#e9f2ed;color:var(--teal);font-size:10px}.control-title label{font-size:13px;font-weight:650;flex:1}.control-title output{font-size:19px;font-weight:700;white-space:nowrap;color:var(--teal);font-variant-numeric:tabular-nums}.target-buttons{display:flex;gap:6px;flex-wrap:wrap;margin-top:13px}.target-buttons button{border:1px solid #cbdad4;border-radius:6px;background:#fff;color:#385c60;font-size:12px;min-height:36px;padding:5px 10px}.target-buttons button[aria-pressed=true]{background:#e0eee7;border-color:#5f9d8a}.fraction-label{font-size:12px;display:block;margin:14px 0 6px}select{width:100%;min-height:42px;background:#f6f8f4;border:1px solid #cad9d3;border-radius:6px;font-size:12px;padding:8px;color:#34565c}.reset{width:100%;padding:9px;border:1px solid #cddbd5;border-radius:6px;background:#fff;color:#506d72;font-size:12px;margin-top:18px}.result-panel{position:sticky;top:18px;padding:28px;background:#fff;border:1px solid #c5d9d2;border-radius:16px;box-shadow:0 8px 30px #1a423609}.result-top{display:flex;gap:8px;justify-content:space-between;align-items:center;flex-wrap:wrap}.status-badge{background:#e2f0e6;border-radius:20px;color:#28644b;padding:4px 10px;font-size:10px;font-weight:600}.result-panel[data-state=reserve] .status-badge{background:#fff1d3;color:#855c0c}.result-panel[data-state=shortfall] .status-badge,.result-panel[data-state=overplus] .status-badge{background:#fbe9df;color:#9b512d}.result-panel h3{font-size:22px;margin:22px 0}.equation{display:grid;grid-template-columns:1fr auto 1fr auto 1fr;gap:7px;align-items:center;background:#f3f7f3;border-radius:10px;padding:18px 10px;text-align:center}.equation div>span{font-size:10px;display:block;color:var(--muted)}.equation strong{display:block;font-size:26px;letter-spacing:-.04em;font-variant-numeric:tabular-nums;white-space:nowrap}.equation small{font-size:11px;font-weight:400}.equation>b{color:#71897e;font-weight:400}.eye-number strong{color:var(--teal)}.formula-caption{font-size:10px;color:var(--muted);text-align:center}.balance{margin-top:24px}.balance-heading{display:flex;justify-content:space-between;gap:12px;font-size:12px}.balance-heading strong{font-variant-numeric:tabular-nums}.meter{height:12px;background:#e8ede8;position:relative;border-radius:8px;margin:12px 0}.used-bar{height:100%;width:50%;background:#3c8e7a;border-radius:8px}.budget-mark{position:absolute;top:-4px;bottom:-4px;width:2px;left:50%;background:#895d1a}.result-panel[data-state=shortfall] .used-bar,.result-panel[data-state=reserve] .used-bar{background:#cb9b48}.result-message{border-left:3px solid #9fc5b6;padding:6px 0 6px 13px;font-size:13px;line-height:1.9;min-height:90px;margin:18px 0}.range-card{padding:16px;border:1px solid #dce6df;border-radius:10px}.range-card>strong{display:block;font-size:25px;letter-spacing:-.02em;color:#245a55;margin-top:4px}.range-card p{margin:5px 0 0}.power-summary{padding:18px 0;border-bottom:1px solid var(--line)}.power-summary>span{font-size:11px;color:var(--muted);display:block}.power-summary>strong{font-size:17px}.power-summary p{margin:4px 0 0}.lesson-tip{margin-top:18px;font-size:12px}.lesson-tip b{font-size:10px;letter-spacing:.05em;color:var(--teal)}.lesson-tip p{margin:3px 0 0}.takeaway{display:block;padding:26px 32px;background:#e8eee1;border-radius:12px;margin-top:24px}.takeaway>span{font-size:12px;color:#567054}.takeaway p{margin:0;font-size:17px}.test-buttons{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:25px 0 0}.test-buttons button{background:#fff;border:1px solid #ccdad4;border-radius:10px;padding:20px;color:#3d5d60}.test-buttons button[aria-pressed=true]{border:2px solid var(--teal);background:#eaf4ed;padding:19px}.test-buttons span{display:block;font-size:13px}.test-buttons strong{font-size:30px;font-variant-numeric:tabular-nums}.test-result{background:#eff3e9;padding:23px;border-radius:10px;margin:16px 0 25px}.test-result>strong{font-size:18px}.test-result p{font-size:13px}.test-result .fine{font-size:11px}.concept-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}.concept-grid article{border-left:1px solid #cbdad4;padding-left:20px}.concept-no{font-size:12px;color:var(--teal)}.concept-grid h3{font-size:15px;margin:8px 0}.concept-grid p{font-size:13px}.concept-grid strong{font-size:11px;color:var(--teal)}.question{border:1px solid #cedbd5;border-radius:14px;padding:28px;background:#fff}.question h3{font-size:20px;margin:12px 0 20px}.answer-buttons{display:flex;gap:12px;flex-wrap:wrap}.answer-buttons button{background:#f0f5ee;border:1px solid #becfc3;padding:12px 18px;font-size:13px;border-radius:8px;color:#304e51}.answer-buttons button[aria-pressed=true]{background:var(--teal);color:#fff}.question>p{font-size:13px;min-height:48px}.closing{display:grid;grid-template-columns:1fr 1fr;gap:30px;margin-top:35px}.closing h3{font-size:26px;line-height:1.7}.closing ol{font-size:14px;line-height:2.4;padding-left:25px}.source-panel{margin-top:32px;border:1px solid #d5ded5;border-radius:10px;padding:20px}.source-panel ul{padding-left:20px}.source-panel li{margin-bottom:10px}.footer-note{font-size:11px;color:#60746d;padding:20px 0 36px}footer{border-top:1px solid var(--line);margin-top:15px}button:disabled{cursor:default;opacity:.6}#distance:disabled{opacity:.45}noscript{display:block;padding:20px;background:#fff1d3} @media(max-width:900px){.hero{gap:30px}.lab{grid-template-columns:1fr 1.1fr;gap:14px}.controls{padding:0 18px 20px}.result-panel{padding:20px}.equation{gap:4px}.equation strong{font-size:22px}.baseline-grid{gap:24px}.hero-card{padding:22px}}@media(max-width:720px){header,footer{padding:20px}header>span{font-size:10px}main{padding:0 20px}.hero{padding:40px 0;grid-template-columns:1fr;gap:24px}.hero-card{transform:none}.distance-stack{display:grid;grid-template-columns:repeat(3,1fr);gap:15px}.distance-stack>div{display:block;text-align:center;border-bottom:0;border-right:1px solid #c9d8d0;padding:0}.distance-stack>div:last-child{border:0}.distance-stack>div>span{display:block;font-size:10px}.distance-stack strong{font-size:31px}.hero-card p{margin-top:16px;text-align:center}.hero-card>span{display:block;text-align:center;margin-bottom:14px}.steps{grid-template-columns:repeat(2,1fr)}.steps a{text-align:left;padding:10px}.section{padding:38px 0}.baseline-grid,.lab,.closing{grid-template-columns:1fr}.result-panel{position:static}.scene-buttons{grid-template-columns:repeat(2,1fr)}.scene-buttons button{min-height:65px}.result-panel h3{font-size:21px}.equation strong{font-size:28px}.concept-grid{grid-template-columns:1fr;gap:20px}.concept-grid p{margin-bottom:6px}.takeaway{display:block;padding:22px}.takeaway>span{display:block;margin-bottom:8px}.takeaway p{font-size:16px}.test-buttons{gap:8px}.test-buttons button{padding:15px 5px}.test-buttons button[aria-pressed=true]{padding:14px 4px}.test-buttons strong{font-size:25px}.question{padding:21px}.answer-buttons{display:grid}.closing{gap:8px}.closing h3{font-size:23px;margin-bottom:0}}@media(max-width:360px){main{padding:0 14px}header{padding:16px 14px;flex-wrap:wrap;gap:4px}.hero h1{font-size:31px}.result-panel{padding:16px}.equation strong{font-size:23px}.control-title label{font-size:12px}.control-title output{font-size:17px}.baseline-setting{padding:18px}.baseline-setting label{flex-wrap:wrap}.wide{display:none}}@media(prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}}

.astigmatism-setting{margin-top:22px;padding-top:20px;border-top:1px solid var(--line)}
.power-summary>strong{display:block;overflow-wrap:anywhere}

.clarity-comparison{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;margin:24px 0}.clarity-comparison figure{margin:0;padding:24px;border:1px solid var(--line);border-radius:14px;background:white}.clarity-comparison figcaption strong,.clarity-comparison figcaption span{display:block}.clarity-comparison figcaption span{font-size:14px;color:var(--muted);margin-top:8px}.clarity-target{color:#152326;background:white;padding:20px 0}.clarity-target svg{display:block;width:100%;height:auto}.clarity-target.blurred svg{filter:blur(2px)}@media(max-width:720px){.clarity-comparison{grid-template-columns:1fr}}

/* 長文の説明枠は段落単位で縦に読む。 */
.takeaway>span{display:block;margin-bottom:10px;font-weight:600}
.takeaway>h3{margin:8px 0 14px}
.takeaway>p{margin:12px 0;font-size:16px;line-height:1.9}
.takeaway>p:last-child{margin-bottom:0}
.takeaway>p.fine{font-size:12px}
.takeaway>a{display:inline-block;margin-top:10px}
.takeaway>.concept-grid{margin:22px 0}
.baseline-divider{border:0;border-top:1px solid var(--line);margin:22px 0}
.baseline-setting select{margin-top:8px}
.clarity-target svg{max-width:380px;margin:auto}

.optics-card{margin:0 0 22px;padding:16px;border:1px solid var(--line);border-radius:12px;background:#fafcf9}.optics-card figcaption{display:flex;flex-wrap:wrap;justify-content:space-between;gap:6px;font-size:13px}.optics-card figcaption span{color:var(--teal)}.optics-card svg{display:block;width:100%;height:auto;margin:10px 0}.optics-card svg text{font-size:16px;fill:#36575c}.optics-card p{font-size:13px;margin:8px 0}.optics-card p.fine{font-size:11px}.optics-card #opticsFocusLabel{font-size:15px;font-weight:700}

.accommodation-stage{border-top:1px solid var(--line);margin-top:12px;padding-top:10px}.accommodation-stage h4{font-size:13px;margin:0}.accommodation-stage h4 span{float:right;color:var(--muted)}.accommodation-action{background:#e3f2e9;border-radius:10px;padding:10px;text-align:center}.accommodation-action svg{width:180px;margin:0 auto}.accommodation-action strong,.accommodation-action span{display:block}.accommodation-action strong{color:var(--teal);font-size:18px}.accommodation-action span{font-size:11px;color:var(--muted)}

.vision-preview{margin:18px 0;padding:16px;background:#eef6ef;border:2px solid #c1d9ca;border-radius:12px}.vision-preview>strong{display:block;font-size:18px;color:#24634c;line-height:1.6}.vision-preview[data-state=shortfall],.vision-preview[data-state=overplus]{background:#fff0e8;border-color:#d8926c}.vision-preview[data-state=shortfall]>strong,.vision-preview[data-state=overplus]>strong{color:#943f23}.vision-preview[data-state=reserve]{background:#fff7e2;border-color:#d6b666}.vision-samples{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:14px}.vision-samples>div{min-width:0;background:white;border-radius:8px;padding:10px;overflow:hidden}.vision-samples span{font-size:11px;display:block;text-align:center;color:var(--muted)}.vision-target{padding:8px 0}.vision-target svg{width:100%;margin:0}.vision-preview p{font-size:13px}@media(max-width:360px){.vision-samples{gap:6px}.vision-samples>div{padding:6px}.vision-preview{padding:12px}}

.steps{grid-template-columns:repeat(4,1fr)}.distance-choice{background:#fff;border:1px solid var(--line);border-radius:14px;padding:0 24px}.distance-choice .control-block{border-bottom:0}@media(max-width:720px){.steps{grid-template-columns:repeat(2,1fr)}}

.adjustment-prescription{padding:22px 0 18px;border-bottom:1px solid var(--line)}.adjustment-prescription span{display:block;font-size:12px;color:var(--muted)}.adjustment-prescription strong{display:block;font-size:17px;overflow-wrap:anywhere;font-variant-numeric:tabular-nums}.adjustment-prescription span:not(:first-child){margin-top:12px}.adjustment-prescription strong:last-child{color:var(--teal)}
