*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px;color-scheme:light}body{margin:0;background:#faf8f3;color:#242522;font:16px/1.8 -apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans",sans-serif}a{color:inherit;text-decoration:none}img{display:block;max-width:100%;height:auto}a:focus-visible,summary:focus-visible{outline:3px solid #a67925;outline-offset:5px}.shell{width:min(1120px,calc(100% - 48px));margin:auto}.skip{position:fixed;top:-80px;background:#fff;padding:12px;z-index:50}.skip:focus{top:10px}header{border-bottom:1px solid #e5ded1;background:#faf8f3f5}.header-inner{display:flex;align-items:center;justify-content:space-between;min-height:76px;gap:20px;font-size:14px}.brand{font-weight:750;letter-spacing:.13em}.hero{display:grid;grid-template-columns:1.5fr .65fr;gap:48px;align-items:center;padding:60px 0}.eyebrow{font-size:12px;font-weight:650;letter-spacing:.13em;color:#936815;margin:0 0 16px}h1{font-size:clamp(40px,5.2vw,72px);line-height:1.2;letter-spacing:-.05em;margin:0 0 25px}h1 span{color:#a67925}.lead{font-size:19px;color:#69685f}.actions{display:flex;gap:16px;flex-wrap:wrap;margin:28px 0 20px}.button{display:inline-flex;justify-content:center;padding:12px 21px;border:1px solid #c7b791;border-radius:7px;font-size:15px;font-weight:600;min-height:48px}.primary{background:#282a26;color:#fff;border-color:#282a26}.button:hover{filter:brightness(1.15)}.hero-visual{border-radius:25px;padding:20px;text-align:center;background:#f1e7d2 url('../tire-pressure-preview/gold-background.webp') center top/cover}.hero-visual p{font-size:20px;color:#8b6725;margin:0 0 12px}.hero-visual img{width:115px;height:250px;object-fit:contain;margin:auto}.hero-visual span{display:block;font-size:13px;color:#827457;margin-top:16px}.chapters{display:flex;flex-wrap:wrap;gap:16px 34px;padding:18px 0;border-block:1px solid #ded6c6;color:#83672c;font-size:14px}.chapter{padding-top:65px}h2{font-size:clamp(26px,3vw,38px);line-height:1.4;letter-spacing:-.03em;margin:0 0 16px}h3{font-size:21px;line-height:1.5;margin:0 0 12px}.intro{max-width:820px;color:#716d62;margin:0 0 30px}.maps-grid{display:grid;grid-template-columns:1fr 1fr;gap:26px}.maps-grid article{border:1px solid #e1d8c8;border-radius:18px;padding:24px;background:#fffefa}.maps-grid article p{font-size:15px;color:#716d62;margin:16px 0 0}.map-crop{position:relative;border-radius:14px;overflow:hidden;max-width:340px;margin:auto}.map-crop img{width:100%}.ring{position:absolute;border:3px solid #ba8628;border-radius:50%;width:12%;aspect-ratio:1;box-shadow:0 0 0 3px #fff8}.apple{left:5%;top:44%}.google{left:73%;top:38%}.share-strip{display:flex;align-items:center;gap:24px;margin:25px 0 12px;padding:25px 28px;background:#f1e7d2;border-radius:14px}.share-strip img{flex:none;border-radius:15px}.share-strip h3{margin-bottom:6px}.share-strip p{font-size:15px;color:#716d62;margin:0}.small{font-size:13px;color:#827c70}.app-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.app-grid figure{margin:0;min-width:0}.app-grid img{width:100%}.app-grid figcaption{font-size:15px;color:#6d6a60;padding:12px 12px 0}.checks{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin:28px 0}.checks article{padding:24px;background:#f3eee4;border:1px solid #e1d8c8;border-radius:15px}.checks span{color:#a67925}.checks h3{margin-top:12px}.checks p{font-size:15px;color:#716d62}.checks a{color:#8b6725;font-size:14px}details{padding:20px 0;border-bottom:1px solid #ded6c6}summary{cursor:pointer;font-weight:600}details p{color:#716d62;max-width:850px}.downloads{display:grid;grid-template-columns:200px 1fr;align-items:center;gap:40px;margin:65px 0 0;padding:36px;background:#f0e8d8;border-radius:20px}.poster-preview img{width:100%;box-shadow:0 12px 24px #55442218;border-radius:5px}.downloads p{color:#716d62}.originals{margin-top:25px;border-top:1px solid #d5c9b2;padding-top:20px}.originals h3{font-size:17px;margin-bottom:0}.originals p{font-size:13px;margin:5px 0 12px}.originals a{display:inline-block;margin:0 24px 10px 0;color:#86601f;border-bottom:1px solid #c7b791}footer{font-size:13px;color:#827c70;padding:35px 0}footer>div{display:flex;justify-content:space-between;gap:20px}footer p a{border-bottom:1px solid #c7b791}@media(max-width:700px){.shell{width:calc(100% - 32px)}.hero{grid-template-columns:1fr;padding:36px 0;gap:20px}.hero-visual{display:none}.lead{font-size:17px}.chapter{padding-top:44px}.maps-grid{gap:14px}.maps-grid article{padding:14px}.maps-grid h3{font-size:18px}.app-grid{grid-template-columns:1fr;gap:28px}.app-grid figure{width:min(100%,380px);margin:auto}.checks{grid-template-columns:1fr}.downloads{grid-template-columns:1fr;padding:24px;gap:24px;margin-top:44px}.poster-preview{width:145px;margin:auto}.share-strip{padding:20px;gap:16px;align-items:flex-start}.share-strip img{width:48px;height:48px}.share-strip h3{font-size:18px}.chapters{gap:10px 20px;font-size:13px}.header-inner{min-height:65px;font-size:13px}.ring{border-width:2px}footer>div{flex-wrap:wrap}}@media(max-width:370px){.maps-grid{grid-template-columns:1fr}.map-crop{max-width:280px}.button{font-size:13px;padding:11px 15px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
/* Navigation cover replaces the tire-guide vehicle cover. */
.hero-visual img{width:100%;height:auto;max-height:320px;object-fit:contain}
@media(max-width:700px){.hero-visual{display:block;max-width:360px;width:100%;margin:auto}.hero-visual img{max-height:260px}}
/* Keep names intact and let prose wrap at natural phrase boundaries. */
.keep{white-space:nowrap}p,figcaption{line-break:strict;text-wrap:pretty}h2,h3{text-wrap:balance}
.share-strip{display:block}.share-copy{max-width:850px}.share-copy p+p{margin-top:9px}.share-menu{margin:22px 0 0;max-width:800px}.share-menu img{width:100%;height:auto;border-radius:0}.share-menu figcaption{font-size:13px;color:#83672c;margin-top:8px;text-align:center}
.hero-visual p .keep{display:inline-block;font-size:inherit;color:inherit;margin:0}
/* Touch-friendly controls and device-width fallbacks; no font-based theme icons. */
.shell{width:calc(100% - 48px);max-width:1120px}.hero>*,.downloads>*{min-width:0}
.header-inner{flex-wrap:wrap;padding-top:12px;padding-bottom:12px;gap:12px 20px}
.page-controls{display:flex;align-items:center;gap:10px;order:3}.back-link{margin-left:auto;order:2}
@media(min-width:701px){.page-controls{order:2;margin-left:auto}.back-link{order:3;margin-left:0}}
.language-switch{display:flex;gap:3px}.page-controls button{font:inherit;min-width:48px;min-height:48px;padding:8px 12px;border:1px solid #c7b791;border-radius:8px;background:transparent;color:inherit;cursor:pointer}
.page-controls button[aria-pressed="true"]{background:#282a26;color:#fff}.back-link,.chapters a,summary,.originals a,footer>div>a,.checks a{min-height:48px;display:inline-flex;align-items:center}summary{display:list-item;padding:10px 0}
button:focus-visible{outline:3px solid #a67925;outline-offset:3px}.chapters{border-top:1px solid #ded6c6;border-bottom:1px solid #ded6c6}.ring{height:auto;padding-bottom:12%;aspect-ratio:auto}
html[lang="en"] h1{font-size:48px;font-size:clamp(34px,4vw,58px);letter-spacing:-.035em}html[lang="ja"] h1{font-size:48px;font-size:clamp(32px,4vw,58px)}
html[data-theme="dark"]{color-scheme:dark}html[data-theme="dark"] body{background:#181a18;color:#f3f0e7}html[data-theme="dark"] header{background:#181a18;border-color:#49483f}
html[data-theme="dark"] .maps-grid article,html[data-theme="dark"] .checks article{background:#222622;border-color:#49483f}html[data-theme="dark"] .share-strip,html[data-theme="dark"] .downloads{background:#2c2b23}
html[data-theme="dark"] .lead,html[data-theme="dark"] .intro,html[data-theme="dark"] .small,html[data-theme="dark"] figcaption,html[data-theme="dark"] .chapter p,html[data-theme="dark"] footer{color:#c5c1b5}
html[data-theme="dark"] .eyebrow,html[data-theme="dark"] .chapters,html[data-theme="dark"] .checks a,html[data-theme="dark"] .originals a{color:#dfbf73}html[data-theme="dark"] .primary,html[data-theme="dark"] .page-controls button[aria-pressed="true"]{background:#dec17c;color:#20221e;border-color:#dec17c}
@media(max-width:700px){.shell{width:calc(100% - 32px)}.page-controls{width:100%;justify-content:flex-end}.hero{gap:28px}.hero h1{font-size:38px}.maps-grid{grid-template-columns:1fr}.app-grid figure{width:100%;max-width:380px}.chapters{gap:4px 18px}.downloads .button{white-space:normal;text-align:center}}
@media(min-width:701px) and (max-width:1000px){.hero{gap:24px}.hero h1{font-size:40px}.checks{grid-template-columns:1fr}}
/* Keep the outlined controls, but reduce mobile header height. */
@media(max-width:700px){
  .header-inner{padding-top:6px;padding-bottom:6px;gap:2px 12px;min-height:0}
  .header-inner .brand,.header-inner .back-link{min-height:32px;display:inline-flex;align-items:center}
  .page-controls{gap:6px}.language-switch{gap:3px}
  .page-controls button{min-height:44px;min-width:44px;padding:5px 10px;font-size:13px;line-height:1.4}
}