:root{--ob-blue:#075b84;--ob-deep:#032b42;--ob-aqua:#58c5cf;--ob-sand:#f4f1e9;--ob-ink:#102b38}
*{box-sizing:border-box}
body.oobiki-page{margin:0;background:#fff;color:var(--ob-ink);font-family:"Noto Sans JP",sans-serif}
.ob-header{height:82px;padding:0 clamp(20px,5vw,76px);display:flex;align-items:center;justify-content:space-between;background:#fff}
.ob-header .back-link{color:var(--ob-deep);font-weight:700;text-decoration:none;border-bottom:1px solid #aac4cf;padding-bottom:4px}
.ob-hero{min-height:calc(100vh - 82px);position:relative;display:flex;align-items:flex-end;background:url("oobiki/island-cliff.webp") center/cover no-repeat}
.hero-shade{position:absolute;inset:0;background:linear-gradient(90deg,rgba(0,29,45,.84),rgba(0,40,62,.38) 55%,rgba(0,0,0,.08))}
.hero-copy{position:relative;z-index:1;color:#fff;padding:clamp(80px,12vh,150px) clamp(24px,8vw,120px);max-width:940px}
.eyebrow{font-family:Oswald,sans-serif;letter-spacing:.18em;font-size:.9rem;font-weight:600;text-transform:uppercase;color:var(--ob-aqua)}
.eyebrow.dark{color:var(--ob-blue)}
.hero-copy h1{font-size:clamp(3.2rem,8vw,7.5rem);line-height:1.04;margin:.16em 0 .25em;font-weight:900;letter-spacing:-.04em}
.hero-copy h1 em{display:inline-block;font-style:normal;color:#a8eef2;white-space:nowrap}
.hero-copy>p:not(.eyebrow){font-size:clamp(1rem,2vw,1.25rem);line-height:2}
.hero-copy>a{display:inline-block;margin-top:22px;padding:15px 25px;background:#fff;color:var(--ob-deep);font-weight:800;text-decoration:none}
.split{display:grid;grid-template-columns:1.1fr .9fr;align-items:center;gap:clamp(36px,7vw,100px);padding:clamp(70px,10vw,140px) clamp(22px,8vw,120px)}
figure{margin:0}img{display:block;width:100%;height:100%;object-fit:cover}
figcaption{font-size:.82rem;color:#667b84;margin-top:10px}
.split figure img{aspect-ratio:4/3}
h2{font-size:clamp(2.2rem,4.8vw,4.8rem);line-height:1.25;margin:.2em 0 .42em;letter-spacing:-.035em}
.ob-about h2{white-space:nowrap;font-size:clamp(2rem,4.2vw,4.4rem)}
.ob-underwater h2{white-space:nowrap;font-size:clamp(2rem,4.2vw,4.4rem)}
.ob-group h2{white-space:nowrap;font-size:clamp(1.9rem,3.8vw,4rem)}
.ob-video h2{white-space:nowrap;font-size:clamp(1.9rem,3.9vw,4.1rem)}
.split p:not(.eyebrow),.route-copy p:not(.eyebrow),.section-heading>p:not(.eyebrow),.ob-group>div p:not(.eyebrow){font-size:1.05rem;line-height:2.05}
.ob-route{background:var(--ob-deep);color:#fff;padding:clamp(70px,10vw,140px) clamp(22px,8vw,120px)}
.route-copy{max-width:780px;margin-bottom:54px}.route-copy p{color:#d3e6ed}
.route-grid,.photo-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.route-grid .wide{grid-row:span 2}.route-grid img{aspect-ratio:4/3}.route-grid .wide img{height:100%}
.ob-route figcaption,.ob-life figcaption,.ob-group figcaption{color:#b8d4df}
.ob-underwater{padding:clamp(70px,10vw,140px) clamp(22px,8vw,120px);background:var(--ob-sand)}
.section-heading{max-width:860px;margin-bottom:52px}
.reef{grid-template-columns:1.4fr 1fr}.reef .large{grid-row:span 2}.reef img{aspect-ratio:4/3}.reef .large img{height:100%}
.ob-life{background:#07577f;color:#fff;padding:clamp(70px,10vw,140px) clamp(22px,8vw,120px)}
.section-heading.light p{color:#d6ebf1}.life{grid-template-columns:repeat(3,1fr)}.life img{aspect-ratio:4/3}
.ob-video video{width:100%;margin-top:26px;background:#001722;max-height:560px}
.ob-group{display:grid;grid-template-columns:1.35fr .65fr;align-items:center;gap:clamp(34px,6vw,90px);background:var(--ob-deep);color:#fff;padding:clamp(70px,10vw,140px) clamp(22px,8vw,120px)}
.ob-group img{aspect-ratio:16/10}
.ob-note{text-align:center;padding:24px;background:#e9f2f4;color:#49616c;font-size:.9rem}
.ob-cta{text-align:center;padding:clamp(80px,12vw,160px) 22px;background:linear-gradient(rgba(1,35,53,.78),rgba(1,35,53,.88)),url("oobiki/calm-water.webp") center/cover;color:#fff}
.ob-cta h2{margin:.2em auto;max-width:900px}.ob-cta>p:not(.eyebrow){font-size:1.05rem}
.ob-cta>div{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-top:30px}
.button{padding:15px 25px;text-decoration:none;font-weight:800}.button.primary{background:#fff;color:var(--ob-deep)}.button.secondary{color:#fff;border:1px solid rgba(255,255,255,.65)}
footer{padding:34px clamp(22px,5vw,76px);display:flex;align-items:center;justify-content:space-between;gap:20px;background:#fff}footer>p{font-size:.78rem;color:#70838b}footer>a:last-child{color:var(--ob-deep);font-weight:700;text-decoration:none}
@media(max-width:760px){.ob-header{height:68px}.ob-header .brand small{display:none}.ob-header .back-link{font-size:.78rem}.ob-hero{min-height:680px}.hero-copy{padding:90px 22px 64px}.hero-copy h1{font-size:clamp(2.55rem,13vw,3.25rem)}.ob-about h2,.ob-underwater h2{font-size:clamp(1.72rem,7.8vw,2.45rem)}.ob-group h2,.ob-video h2{font-size:clamp(1.7rem,7.9vw,2.45rem)}.split,.ob-group{grid-template-columns:1fr}.ob-about figure{order:2}.route-grid,.reef,.life{grid-template-columns:1fr}.route-grid .wide,.reef .large{grid-row:auto}.route-grid img,.route-grid .wide img,.reef img,.reef .large img,.life img{height:auto;aspect-ratio:4/3}.ob-group{grid-template-columns:1fr}.ob-group figure{order:2}footer{flex-direction:column;text-align:center}}