:root{--navy:#05233d;--white:#e9f6f7;--submerge:0}*{box-sizing:border-box}html,body{margin:0;font-family:Arial,"Microsoft YaHei",sans-serif;color:var(--navy);background:#002333}html{scroll-behavior:smooth}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit;cursor:pointer}a{color:inherit;text-decoration:none}button:focus-visible,a:focus-visible{outline:2px solid currentColor;outline-offset:6px}#journey{height:410vh;height:410svh}.scene{position:sticky;top:0;height:100vh;height:100svh;min-height:430px;overflow:hidden;isolation:isolate}.fallback,canvas,.grain{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}.fallback{background:url('assets/sunset.jpg') center 45%/cover}.grain{opacity:.025;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Cpath fill='%23fff' filter='url(%23n)' d='M0 0h140v140H0z'/%3E%3C/svg%3E")}.announcement{position:absolute;top:0;left:0;right:0;height:29px;display:flex;align-items:center;justify-content:center;gap:16px;background:#557e991f;color:#edf3f5;font-size:9px;letter-spacing:.04em;border-bottom:1px solid #ffffff18}header{position:absolute;top:29px;left:4.2%;right:4.2%;height:69px;display:flex;align-items:center;justify-content:space-between;color:var(--navy);transition:color .5s}.logo{display:flex;align-items:center;gap:13px;font-size:11px;font-weight:600;letter-spacing:.32em}.logo svg{width:45px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round}nav{display:flex;align-items:center;gap:38px;margin-left:30px}nav a,nav button{font-size:11px;background:none;border:0;padding:9px 0;color:inherit}.outline{font-size:11px;border:1px solid #183e5a70;border-radius:40px;padding:10px 17px;display:flex;gap:13px;align-items:center}.intro{position:absolute;top:22%;left:6.4%;z-index:2;clip-path:inset(0 0 var(--cover,0%) 0);will-change:transform,clip-path}.eyebrow{font-size:9px;font-weight:600;letter-spacing:.35em;margin:0 0 13px}h1{font-family:Georgia,'Times New Roman',serif;font-size:clamp(52px,6.9vw,122px);font-weight:400;line-height:.89;letter-spacing:-.052em;margin:0 0 13px}.subtitle{font-size:clamp(13px,1.32vw,20px);line-height:1.35;margin:0;color:#344c5d}.actions{display:flex;align-items:center;gap:23px;margin-top:20px}.primary{display:inline-flex;align-items:center;justify-content:center;gap:14px;border:0;border-radius:50px;padding:13px 22px;background:#05233d;color:#f7fafc;font-size:10px;transition:background .2s}.primary:hover{background:#105775}#film{background:none;border:0;display:flex;align-items:center;gap:10px;font-size:10px;color:var(--navy);padding:0}.play{display:grid;place-items:center;width:29px;height:29px;border-radius:50%;border:1px solid #2141588c;font-size:10px;padding-left:2px}.sea-footer{position:absolute;bottom:5.8%;left:3.4%;right:3.4%;display:flex;align-items:center;justify-content:space-between;color:var(--white);z-index:4}.sea-footer button{display:flex;align-items:center;gap:12px;font-size:8px;letter-spacing:.25em;border:0;background:none;color:inherit;padding:8px}.pause-icon{display:grid;place-items:center;height:25px;width:25px;border:1px solid #cde3ee80;border-radius:50%;font-size:12px;letter-spacing:0}#descend>span{font-size:22px;font-weight:normal;line-height:1;animation:nudge 2.5s ease-in-out infinite}.progress{position:absolute;bottom:0;left:0;right:0;height:2px;background:#b1d8e827}.progress i{display:block;height:100%;background:#edf9ff;transform:scaleX(var(--progress,0));transform-origin:left}.deep-note{position:absolute;top:38%;left:6.4%;color:#def4f7;opacity:0;transform:translateY(30px);pointer-events:none}.deep-note h2,dialog h2{font:400 clamp(42px,6vw,90px)/1 Georgia,serif;letter-spacing:-.04em;margin:14px 0}.deep-note p:last-child{font-size:14px;color:#a1c7d2}.depth{position:absolute;right:4%;top:50%;font-size:9px;letter-spacing:.2em;color:#e4f6ff;opacity:var(--submerge)}body.submerged header{color:#daf2f5}body.submerged .outline{border-color:#d4edf570}dialog{border:1px solid #bed5df40;border-radius:2px;background:#082d3b;color:#e2f2f5;max-width:640px;width:calc(100% - 40px);padding:60px 45px;box-shadow:0 30px 100px #0008}dialog::backdrop{background:#021b2bb3;backdrop-filter:blur(10px)}dialog p:not(.eyebrow){font-size:15px;line-height:1.9;color:#b4d0d8}.close{position:absolute;right:20px;top:16px;border:0;background:none;font-size:30px;color:inherit}.close-bottom{margin-top:20px;border:1px solid #c3e2ee55}.nojs{position:fixed;bottom:0;color:white;background:#05233d;padding:12px;font-size:12px}@keyframes nudge{50%{transform:translateY(5px)}}@media(max-width:650px){header{height:60px;left:6%;right:6%}nav{gap:16px;margin:0}nav a,nav button{font-size:10px}header>.outline{display:none}.logo{font-size:9px;gap:7px}.logo svg{width:30px}.intro{left:7%;top:25%;right:7%}h1{font-size:clamp(58px,13.5vw,88px)}.eyebrow{font-size:8px;letter-spacing:.22em}.subtitle{font-size:14px}.actions{gap:17px}.primary{padding:12px 16px}.sea-footer{bottom:4%;left:4%;right:4%}.sea-footer button{font-size:7px;letter-spacing:.15em}.deep-note{left:7%}.depth{right:6%}dialog{padding:45px 26px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation:none!important;transition:none!important}}

/* Reference framing: a low horizon, fine navigation, fixed surface copy. */
header{height:62px}h1{font-size:clamp(52px,6.8vw,122px)}.announcement{height:27px}.scene{--cover:0%}@media(min-width:900px){.intro{top:22.5%}.subtitle{font-size:clamp(14px,1.4vw,20px)}}