/* TOP-only stylesheet. Every selector is scoped to the companion homepage. */
body.bbkh-page{--ink:#163d49;--sky:#dff4fc;--cream:#fffdf3;--green:#dfebce;--yellow:#ffdf72;margin:0;color:var(--ink);background:var(--cream);font-family:'Hiragino Maru Gothic ProN','Hiragino Kaku Gothic ProN','Yu Gothic',Meiryo,sans-serif;font-size:18px;line-height:1.8;overflow-wrap:anywhere}
.bbkh-site{isolation:isolate;width:100%}.bbkh-site *,.bbkh-site *::before,.bbkh-site *::after{box-sizing:border-box}
.bbkh-site h1,.bbkh-site h2,.bbkh-site h3,.bbkh-site p,.bbkh-site figure{margin:0}.bbkh-site h1,.bbkh-site h2,.bbkh-site h3{padding:0;border:0;background:none;color:inherit;font-weight:800;line-height:1.6}
.bbkh-site h1::before,.bbkh-site h1::after,.bbkh-site h2::before,.bbkh-site h2::after,.bbkh-site h3::before,.bbkh-site h3::after{content:none}
.bbkh-site a{color:inherit;text-decoration:none}.bbkh-site img{display:block;max-width:100%;height:auto}.bbkh-site :focus-visible{outline:4px solid #1755ad;outline-offset:5px}
.bbkh-container{width:min(100% - 40px,1100px);margin-inline:auto}.bbkh-skip-link{position:fixed;top:8px;left:8px;z-index:100000;padding:10px 18px;background:white;transform:translateY(-180%)}.bbkh-skip-link:focus{transform:none}
.bbkh-header{min-height:80px;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:18px max(20px,calc((100vw - 1180px)/2));border-bottom:2px solid var(--ink);background:var(--cream)}
.bbkh-brand{font-size:clamp(17px,2.4vw,25px);font-weight:900;line-height:1.5;letter-spacing:.015em}.bbkh-brand span{display:block;font-size:10px;letter-spacing:.17em}.bbkh-header-link{display:inline-flex;align-items:center;min-height:44px;border:1.5px solid var(--ink);border-radius:50px;padding:7px 14px;font-size:13px;font-weight:700;white-space:nowrap;background:white}
.bbkh-hero{position:relative;overflow:hidden;background:var(--sky);text-align:center;border-bottom:3px solid var(--ink);padding:43px 0 117px}
.bbkh-hero .bbkh-container{position:relative;z-index:2}.bbkh-eyebrow{display:inline-block;padding:5px 12px;border-radius:30px;border:1.5px solid var(--ink);background:#fffdf3;font-size:12px;font-weight:800;margin-bottom:20px!important}
.bbkh-site .bbkh-title{font-size:clamp(30px,7.8vw,62px);line-height:1.55;letter-spacing:.025em}.bbkh-lead{font-size:clamp(18px,4.8vw,24px);font-weight:700;margin:18px 0 25px!important}
.bbkh-button{display:inline-flex;align-items:center;justify-content:center;min-height:60px;padding:12px 30px;border:2px solid var(--ink);border-radius:50px;background:var(--yellow);box-shadow:0 5px 0 var(--ink);font-size:21px;font-weight:800;text-align:center}
.bbkh-hero-vehicles{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));align-items:center;gap:10px;max-width:930px;margin:48px auto 4px}.bbkh-hero-vehicle{display:flex;flex-direction:column;align-items:center;gap:6px;min-width:0}.bbkh-hero-vehicle img{width:100%;height:clamp(105px,26vw,260px);object-fit:contain;filter:drop-shadow(0 8px 0 rgba(22,61,73,.08))}.bbkh-vehicle-name{display:block;font-size:clamp(12px,3vw,18px);font-weight:800}
.bbkh-cloud{position:absolute;top:130px;right:-38px;width:125px;height:35px;background:#fff;border-radius:50px;opacity:.95}.bbkh-cloud::before,.bbkh-cloud::after{content:'';position:absolute;width:56px;height:56px;bottom:8px;left:16px;background:#fff;border-radius:50%}.bbkh-cloud::after{width:40px;height:40px;left:69px}.bbkh-cloud--two{top:230px;left:-48px;right:auto;transform:scale(.75)}
.bbkh-town{position:absolute;bottom:37px;left:0;display:flex;width:100%;height:70px;align-items:flex-end;justify-content:space-around;background:linear-gradient(transparent 82%,#a7c98a 82%)}.bbkh-town span{width:53px;height:52px;border:2px solid #739c98;border-bottom:0;border-radius:5px 5px 0 0;background:repeating-linear-gradient(90deg,transparent 0 12px,#9cbbbb 12px 20px,transparent 20px 28px) center 14px/100% 9px no-repeat,#fff6d2}.bbkh-town span:nth-child(2n){height:72px;width:76px;background-color:#c6ddca}.bbkh-town span:nth-child(3n){width:48px;height:54px;border-radius:50% 50% 0 0;background:#9fc584;border-color:#769a63}
.bbkh-road{position:absolute;bottom:0;left:0;width:100%;height:39px;border-top:3px solid var(--ink);background:#54727b}.bbkh-road::after{content:'';position:absolute;top:16px;left:0;width:100%;height:3px;background:repeating-linear-gradient(90deg,transparent 0 26px,#fff9e5 26px 58px,transparent 58px 88px)}
.bbkh-section{padding:62px 0;text-align:center;position:relative}.bbkh-site .bbkh-section-title{font-size:clamp(24px,5.8vw,37px);letter-spacing:.015em}.bbkh-section-lead{font-size:clamp(20px,4.7vw,26px);font-weight:700;line-height:1.9;margin:17px auto 30px!important;max-width:28em}
.bbkh-vehicle-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px;margin:32px 0}.bbkh-card{display:flex;flex-direction:column;align-items:center;background:white;border:2px solid var(--ink);border-radius:22px;padding:20px 12px 17px;box-shadow:3px 4px 0 #dfebce;min-width:0}.bbkh-card-image{display:grid;place-items:center;width:100%;min-height:110px;margin-bottom:12px}.bbkh-card-image img{width:100%;height:110px;object-fit:contain}.bbkh-card-name{font-size:17px;font-weight:800}.bbkh-card-formal{font-size:12px;opacity:.8;margin-top:4px}
.bbkh-section--youtube{background:#dfebce;border-block:2px solid var(--ink);padding:60px 0 70px}.bbkh-youtube-card{background:var(--cream);border:2px solid var(--ink);border-radius:28px;box-shadow:6px 7px 0 #adc892;padding:33px 23px;max-width:880px;margin:auto}.bbkh-youtube-card .bbkh-button{background:#ffe6be}.bbkh-youtube-card .bbkh-section-lead{font-size:22px}.bbkh-preparing,.bbkh-empty{font-size:15px;line-height:1.9;color:#425e62;margin-top:20px!important}.bbkh-preparing{display:inline-block;border:1px dashed #8aa28e;border-radius:40px;padding:6px 18px;background:#fffdf3}
.bbkh-section--parents{background:var(--cream);padding-top:65px}.bbkh-section--parents .bbkh-section-title{font-size:26px}.bbkh-content-grid{display:grid;gap:22px;margin-top:30px;text-align:left}.bbkh-feature-card{display:flex;flex-direction:column;justify-content:center;min-height:190px;padding:29px 25px;border:2px solid var(--ink);border-radius:24px;background:#fff0bd;box-shadow:4px 5px 0 #e2dcc3}.bbkh-feature-card:nth-child(2){background:#e5f2f7}.bbkh-feature-card h3{font-size:23px;margin-bottom:13px}.bbkh-feature-card p{font-size:16px;line-height:1.9}.bbkh-feature-card .bbkh-preparing{align-self:flex-start;font-size:12px;margin-top:17px!important}.bbkh-feature-card a{display:block}.bbkh-feature-card a:focus-visible{outline-offset:12px}
.bbkh-section--about{border-top:1px solid #b3c2bd;padding:40px 0 50px;background:#f3f3e8}.bbkh-section--about .bbkh-section-title{font-size:21px}.bbkh-section--about p{max-width:42em;margin:17px auto 0;line-height:2.1;font-size:16px;text-align:left}
.bbkh-footer{padding:25px 20px;border-top:2px solid var(--ink);background:#dfebce;text-align:center;font-size:12px}.bbkh-footer p{font-size:17px;font-weight:800}.bbkh-footer span{display:block;font-size:11px;margin-top:4px}
@media(hover:hover){.bbkh-button:hover,.bbkh-header-link:hover{background:#fff0ae}.bbkh-card:hover{background:#fff7d8}.bbkh-feature-card a:hover{text-decoration:underline;text-underline-offset:5px}}
@media(min-width:760px){.bbkh-container{width:min(100% - 80px,1100px)}.bbkh-header{min-height:96px}.bbkh-header-link{padding:9px 23px;font-size:15px}.bbkh-hero{padding-top:55px;padding-bottom:130px}.bbkh-eyebrow{font-size:15px}.bbkh-hero-vehicles{gap:35px;margin-top:42px}.bbkh-cloud--one{right:7%;top:170px}.bbkh-cloud--two{left:5%;top:220px;transform:scale(1)}.bbkh-section{padding-block:85px}.bbkh-vehicle-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:22px;margin-block:40px}.bbkh-card{padding:24px}.bbkh-card-image{min-height:160px}.bbkh-card-image img{height:160px}.bbkh-card-name{font-size:21px}.bbkh-youtube-card{padding:48px}.bbkh-content-grid{grid-template-columns:1fr 1fr;gap:28px}.bbkh-feature-card{padding:35px;min-height:230px}.bbkh-section--about{padding-block:45px}}
@media(min-width:1080px){.bbkh-vehicle-grid{grid-template-columns:repeat(6,minmax(0,1fr));gap:16px}.bbkh-card{padding:20px 10px}.bbkh-card-image{min-height:100px}.bbkh-card-image img{height:100px}.bbkh-card-name{font-size:16px}}
@media(prefers-reduced-motion:reduce){.bbkh-site *{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
.bbkh-sr-only{position:absolute!important;width:1px;height:1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.bbkh-hero-vehicles{margin-bottom:28px}.bbkh-section--zukan{padding-bottom:95px}.bbkh-section--zukan::after{content:'';position:absolute;bottom:19px;left:0;width:100%;height:18px;border-block:2px solid #54727b;border-radius:20px;background:repeating-linear-gradient(90deg,#54727b 0 25px,#fffdf3 25px 49px,#54727b 49px 75px) center/100% 2px no-repeat,#54727b}
.bbkh-section--youtube{border-radius:28px}.bbkh-section--about{border-radius:20px 20px 0 0}.bbkh-section--parents::before{content:'';display:block;width:18px;height:27px;margin:0 auto 20px;border-radius:50% 50% 30% 30%;background:#88ad74;box-shadow:-22px 8px 0 -3px #afc78e,22px 8px 0 -3px #afc78e}
.bbkh-hero-vehicles:has(>.bbkh-hero-vehicle:only-child){grid-template-columns:minmax(0,300px);justify-content:center}.bbkh-hero-vehicles:has(>.bbkh-hero-vehicle:nth-child(2):last-child){grid-template-columns:repeat(2,minmax(0,1fr));max-width:650px}
@media(hover:hover){a.bbkh-feature-card:hover{background:#fff3cc}}

/* Mobile refinement only; preserve the existing 760px desktop breakpoint. */
@media (max-width: 759px) {
  .bbkh-hero { padding-top: 25px; padding-bottom: 110px; }
  .bbkh-eyebrow { font-size: 11px; padding: 4px 10px; margin-bottom: 12px !important; }
  .bbkh-site .bbkh-title { font-size: clamp(25px, 6.8vw, 38px); line-height: 1.45; }
  .bbkh-lead { font-size: 18px; margin: 12px 0 15px !important; }
  .bbkh-hero-vehicles { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 6px; margin: 20px auto 20px; }
  .bbkh-hero-vehicle { gap: 5px; }
  .bbkh-hero-vehicle img { width: 100%; height: clamp(85px, 25vw, 150px); object-fit: contain; }
  .bbkh-vehicle-name { font-size: clamp(11px, 2.9vw, 15px); line-height: 1.5; }
  .bbkh-hero .bbkh-button { min-height: 54px; font-size: 19px; padding: 10px 25px; }
  .bbkh-vehicle-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 13px; margin: 26px 0; }
  .bbkh-card { padding: 15px 10px; }
  .bbkh-card-image { min-height: 0; margin-bottom: 10px; }
  .bbkh-card-image img { height: clamp(95px, 28vw, 145px); object-fit: contain; }
  .bbkh-site .bbkh-card-name { font-size: 16px; line-height: 1.6; }
  .bbkh-section--youtube { padding: 30px 0 36px; }
  .bbkh-youtube-card { padding: 23px 16px; }
  .bbkh-youtube-card .bbkh-section-lead { font-size: 20px; line-height: 1.7; margin: 13px auto 22px !important; }
  .bbkh-youtube-card .bbkh-button { min-height: 54px; padding: 10px 20px; font-size: 19px; }
  .bbkh-section--parents { padding: 48px 0; }
  .bbkh-section--parents::before { margin-bottom: 15px; }
  .bbkh-content-grid { gap: 17px; margin-top: 23px; }
  .bbkh-feature-card { min-height: 170px; padding: 23px 22px; }
  .bbkh-section--about { padding: 30px 0 36px; }
}

@media (max-width: 359px) {
  .bbkh-section--youtube { padding: 48px 0 50px; }
}

/* Header navigation: native anchor links, no extra JavaScript. */
.bbkh-header-nav { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 8px; }
.bbkh-site #bbkh-youtube-title, .bbkh-site #bbkh-parents-title { scroll-margin-top: 65px; }
@media (max-width: 759px) {
 .bbkh-header { flex-wrap: wrap; gap: 12px; }
 .bbkh-header-nav { width: 100%; display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 6px; }
 .bbkh-header-nav .bbkh-header-link { justify-content: center; white-space: normal; text-align: center; padding: 8px 5px; font-size: 12px; line-height: 1.5; min-height: 46px; }
}