:root{--abyss:#061a20;--trench:#0c2d36;--tide:#12424d;--foam:#d8ece8;--mist:#9fc1bc;--brass:#2fe0a0;--coral:#ff7a5c;--kelp:#9fe8ff;--line:rgba(216,236,232,.14);
--serif:"Bahnschrift","DIN Alternate","Arial Nova","Segoe UI Variable Display","Avenir Next Condensed","Roboto Condensed",system-ui,sans-serif;--mono:ui-monospace,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;--rail:200px}
*{box-sizing:border-box}html{scroll-behavior:smooth}
[hidden]{display:none!important}
body{margin:0;background:var(--abyss);color:var(--foam);font-family:var(--serif);font-size:1.08rem;line-height:1.65;min-height:100dvh}
body::before{content:"";position:fixed;inset:0;pointer-events:none;z-index:0;background:radial-gradient(ellipse at 80% -10%,rgba(95,179,161,.18),transparent 55%),radial-gradient(ellipse at 0% 110%,rgba(18,66,77,.9),transparent 60%)}
a{color:var(--brass);text-underline-offset:3px}a:hover{color:#bdf7ff}
:focus-visible{outline:2px solid var(--brass);outline-offset:3px;border-radius:2px}
.skip{position:absolute;left:-999px;top:8px;background:var(--brass);color:var(--abyss);padding:8px 14px;z-index:99}.skip:focus{left:8px}
.mono{font-family:var(--mono);letter-spacing:.02em}
/* rail */
.rail{position:fixed;left:0;top:0;bottom:0;width:var(--rail);border-right:1px solid var(--line);padding:26px 0 20px 22px;display:flex;flex-direction:column;z-index:20;background:linear-gradient(180deg,rgba(7,29,36,.92),rgba(12,45,54,.92))}
.mark{display:flex;align-items:center;gap:6px;text-decoration:none;color:var(--foam);font-family:var(--mono);font-size:.95rem;font-weight:600}
.mark .tg{display:inline-block;width:28px;height:15px;border:1.5px solid var(--brass);border-radius:9px;position:relative}
.mark .tg::after{content:"";position:absolute;right:2px;top:2px;width:9px;height:9px;border-radius:50%;background:var(--brass)}
.mark b{color:var(--kelp);font-weight:600}
.mark small{display:block;font-size:.62rem;color:var(--mist);font-weight:400;letter-spacing:.14em}
.gauge{list-style:none;margin:38px 0 0;padding:0 0 0 14px;border-left:1px solid var(--line);flex:1;position:relative}
.gauge li{position:relative;margin:0 0 4px}
.gauge li::before{content:"";position:absolute;left:-14px;top:50%;width:8px;border-top:1px solid var(--mist)}
.gauge a{display:flex;justify-content:space-between;padding:7px 16px 7px 0;color:var(--mist);text-decoration:none;font-family:var(--mono);font-size:.78rem}
.gauge a span{opacity:.55}
.gauge a:hover,.gauge a[aria-current=page]{color:var(--foam)}
.gauge a[aria-current=page]::before{content:"";position:absolute;left:-19px;top:50%;width:10px;height:10px;margin-top:-5px;background:var(--brass);transform:rotate(45deg);animation:ping 2.6s ease-out infinite}
@keyframes ping{0%{box-shadow:0 0 0 0 rgba(47,224,160,.5)}70%,100%{box-shadow:0 0 0 12px rgba(47,224,160,0)}}
.rail .hrs{font-family:var(--mono);font-size:.68rem;color:var(--mist);line-height:1.5}
.menubtn{display:none}
main,.tidetable{margin-left:var(--rail);position:relative;z-index:1}
/* overlay menu (mobile) */
.overlay{position:fixed;inset:0;background:var(--trench);z-index:40;padding:80px 28px 30px;display:none;overflow:auto}
.overlay.open{display:block}
.overlay ol{list-style:none;padding:0;margin:0;counter-reset:d}
.overlay a{display:flex;justify-content:space-between;align-items:baseline;border-bottom:1px solid var(--line);padding:14px 0;color:var(--foam);text-decoration:none;font-size:1.6rem;font-style:italic}
.overlay a span{font-family:var(--mono);font-size:.75rem;font-style:normal;color:var(--brass)}
.overlay .close{position:absolute;top:18px;right:20px}
.btn{font-family:var(--mono);font-size:.85rem;display:inline-flex;align-items:center;gap:10px;padding:12px 20px;border:1px solid var(--brass);color:var(--abyss);background:var(--brass);text-decoration:none;cursor:pointer;border-radius:0;transition:transform .2s}
.btn:hover{transform:translateY(-2px);color:var(--abyss)}
.btn.ghost{background:transparent;color:var(--brass)}
/* sections */
.wrap{padding:0 clamp(20px,5vw,72px);max-width:1240px}
.chart{display:grid;grid-template-columns:200px 1fr;gap:clamp(20px,4vw,60px);padding:clamp(48px,7vw,96px) 0;border-top:1px solid var(--line)}
.chart:first-of-type{border-top:0}
.chart>aside{font-family:var(--mono);font-size:.75rem;color:var(--mist);text-transform:uppercase;letter-spacing:.12em}
.chart>aside strong{display:block;color:var(--brass);font-size:1.6rem;letter-spacing:0;font-weight:400;margin-bottom:6px}
h1,h2,h3{font-weight:400;line-height:1.08;margin:0 0 .5em}
h1{font-size:clamp(2.6rem,7vw,5.6rem);letter-spacing:-.02em}
h2{font-size:clamp(1.8rem,3.6vw,2.8rem)}
h3{font-size:1.35rem}
h1 em,h2 em{color:var(--kelp)}
.lede{font-size:clamp(1.15rem,1.8vw,1.4rem);color:var(--mist);max-width:44ch}
p{max-width:66ch}
.pagehead{padding:clamp(70px,10vw,140px) 0 30px;position:relative}
.pagehead .kick{font-family:var(--mono);font-size:.78rem;color:var(--brass);letter-spacing:.16em;text-transform:uppercase}
/* hero */
.hero{position:relative;min-height:92dvh;display:flex;flex-direction:column;justify-content:flex-end;padding-bottom:60px;overflow:hidden}
.contours{position:absolute;inset:0;width:100%;height:100%;opacity:.55}
.contours path{fill:none;stroke:var(--kelp);stroke-width:1;animation:drift 18s ease-in-out infinite alternate}
.contours path:nth-child(odd){stroke:rgba(216,236,232,.35);animation-duration:24s}
@keyframes drift{to{transform:translate(-30px,14px)}}
.hero .inner{position:relative}
.bool{font-family:var(--mono);font-size:.85rem;color:var(--mist);display:flex;gap:18px;flex-wrap:wrap;margin:26px 0}
.bool code{color:var(--kelp)}
/* ledger */
.ledger{list-style:none;margin:0;padding:0}
.ledger li{display:grid;grid-template-columns:80px 1fr 1.4fr;gap:20px;padding:24px 0;border-bottom:1px solid var(--line);align-items:baseline;transition:background .3s}
.ledger li:hover{background:rgba(95,179,161,.06)}
.ledger .d{font-family:var(--mono);color:var(--brass);font-size:.85rem}
.ledger h3{margin:0}
.ledger p{margin:0;color:var(--mist)}
.split{display:grid;grid-template-columns:1fr 1fr;gap:40px}
figure{margin:0}
figure img{width:100%;height:auto;display:block;filter:saturate(.75) contrast(1.05);border:1px solid var(--line)}
figcaption{font-family:var(--mono);font-size:.72rem;color:var(--mist);margin-top:10px;line-height:1.5}
.note{border-left:3px solid var(--brass);padding:4px 0 4px 18px;color:var(--mist)}
.steps{counter-reset:s;list-style:none;padding:0;margin:0}
.steps li{counter-increment:s;padding:18px 0 18px 64px;position:relative;border-bottom:1px dashed var(--line)}
.steps li::before{content:counter(s,decimal-leading-zero);position:absolute;left:0;top:16px;font-family:var(--mono);color:var(--brass);font-size:1.3rem}
details{border-bottom:1px solid var(--line);padding:14px 0}
summary{cursor:pointer;font-size:1.2rem;list-style:none;display:flex;justify-content:space-between;gap:20px}
summary::after{content:"+";font-family:var(--mono);color:var(--brass)}
details[open] summary::after{content:"-"}
summary::-webkit-details-marker{display:none}
details p{color:var(--mist)}
.diagram{width:100%;height:auto;max-width:640px}
/* forms / tool */
label{display:block;font-family:var(--mono);font-size:.76rem;letter-spacing:.08em;text-transform:uppercase;color:var(--mist);margin:18px 0 6px}
input,select,textarea{width:100%;background:rgba(7,29,36,.6);border:1px solid var(--line);border-bottom:1px solid var(--kelp);color:var(--foam);font:inherit;font-size:1rem;padding:11px 12px;border-radius:0}
input:focus,select:focus,textarea:focus{outline:2px solid var(--brass);outline-offset:0}
.check{display:flex;gap:12px;align-items:flex-start;text-transform:none;letter-spacing:0;font-family:var(--serif);font-size:1rem;color:var(--foam)}
.check input{width:20px;height:20px;margin-top:3px;flex:none;accent-color:var(--brass)}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:0 24px}
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.status{margin-top:20px;padding:16px;border:1px solid var(--line);font-family:var(--mono);font-size:.85rem;display:none}
.status.show{display:block}.status.ok{border-color:var(--kelp)}.status.err{border-color:var(--coral)}
.toolgrid{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:start}
.sonar{position:sticky;top:30px;border:1px solid var(--line);padding:24px;background:rgba(12,45,54,.6)}
.depthbar{height:240px;width:44px;border:1px solid var(--line);position:relative;float:right;margin-left:18px;background:linear-gradient(180deg,rgba(95,179,161,.2),rgba(7,29,36,.9))}
.depthbar i{position:absolute;left:-6px;right:-6px;height:3px;background:var(--brass);transition:top .6s cubic-bezier(.2,.8,.2,1)}
.score{font-family:var(--mono);font-size:3rem;color:var(--brass);line-height:1}
fieldset{border:0;border-top:1px solid var(--line);padding:10px 0 0;margin:24px 0 0}
legend{font-size:1.3rem;padding-right:10px}
pre.report{white-space:pre-wrap;font-family:var(--mono);font-size:.78rem;background:var(--abyss);border:1px solid var(--line);padding:14px;max-height:260px;overflow:auto;clear:both}
.map{border:1px dashed var(--mist);padding:30px;background:repeating-linear-gradient(45deg,rgba(95,179,161,.05) 0 10px,transparent 10px 20px);text-align:center}
/* footer */
.tidetable{border-top:1px solid var(--line);background:var(--trench);padding:40px clamp(20px,5vw,72px) 30px}
.tidetable dl{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:24px;margin:0 0 30px;font-family:var(--mono);font-size:.82rem}
.tidetable dt{color:var(--brass);font-size:.68rem;letter-spacing:.14em;text-transform:uppercase;margin-bottom:6px}
.tidetable dd{margin:0;word-break:break-word}
.tidetable .base{display:flex;flex-wrap:wrap;gap:18px;justify-content:space-between;font-family:var(--mono);font-size:.72rem;color:var(--mist);border-top:1px solid var(--line);padding-top:18px}
.linkbtn{background:none;border:0;color:var(--brass);font:inherit;text-decoration:underline;cursor:pointer;padding:0}
/* cookie */
.cookie{position:fixed;right:20px;bottom:20px;max-width:420px;background:var(--tide);border:1px solid var(--brass);padding:20px;z-index:60;display:none;font-size:.95rem}
.cookie.show{display:block}.cookie h2{font-size:1.2rem}
.cookie .row{display:flex;gap:10px;margin-top:14px}.cookie .row .btn{flex:1;justify-content:center}
.reveal{opacity:0;transform:translateY(28px);transition:opacity .9s ease,transform .9s cubic-bezier(.2,.8,.2,1)}
.reveal.in{opacity:1;transform:none}
@media (max-width:1000px){.toolgrid,.split{grid-template-columns:1fr}.sonar{position:static}.tidetable dl{grid-template-columns:1fr 1fr}}
@media (max-width:800px){:root{--rail:0px}
.rail{position:fixed;top:0;left:0;right:0;bottom:auto;width:auto;height:60px;flex-direction:row;align-items:center;justify-content:space-between;padding:0 16px;border-right:0;border-bottom:1px solid var(--line)}
.rail .gauge,.rail .hrs{display:none}.menubtn{display:inline-flex;padding:8px 14px}
main{padding-top:60px}.chart{grid-template-columns:1fr}.ledger li{grid-template-columns:1fr}.grid2{grid-template-columns:1fr}.tidetable dl{grid-template-columns:1fr}
.cookie{left:12px;right:12px;bottom:12px}}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}.reveal{opacity:1;transform:none}}

/* ---- revision: top nav, sans/mono, data bands, open modules ---- */
[hidden]{display:none!important}
body{letter-spacing:.005em}
h1,h2,h3{font-weight:700;letter-spacing:-.025em;text-transform:none}
h1 em,h2 em{font-style:normal;color:var(--brass)}
.overlay a{font-style:normal;font-weight:700;text-transform:uppercase;letter-spacing:.02em}
.rail{display:none}
.topbar{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:28px;padding:0 clamp(16px,3vw,40px);height:68px;background:rgba(6,26,32,.94);border-bottom:1px solid var(--line);backdrop-filter:blur(8px)}
.topbar .mark{font-size:1rem;letter-spacing:.12em;gap:10px;flex:none}
.topbar .mark b{color:var(--brass)}
.topnav{flex:1;min-width:0}
.topnav ol{list-style:none;margin:0;padding:0;display:flex;justify-content:center;flex-wrap:wrap;gap:2px}
.topnav a{display:block;padding:8px 11px;font-family:var(--mono);font-size:.74rem;text-transform:uppercase;letter-spacing:.06em;color:var(--mist);text-decoration:none;border-bottom:2px solid transparent}
.topnav a:hover{color:var(--foam)}
.topnav a[aria-current=page]{color:var(--brass);border-bottom-color:var(--brass)}
.topbar .hrs{margin:0;font-family:var(--mono);font-size:.7rem;color:var(--mist);flex:none}
main,.tidetable{margin-left:0}
.wrap{max-width:1440px;margin:0 auto}
.hero{min-height:88dvh;justify-content:center;padding:60px 0}
.mega{font-size:clamp(2.6rem,9.5vw,9.5rem);line-height:.92;text-transform:uppercase;letter-spacing:-.04em;max-width:12ch;overflow-wrap:break-word}
.bands{position:absolute;inset:0;display:grid;grid-template-rows:repeat(6,1fr);opacity:.9}
.bands i{border-top:1px solid var(--line);position:relative;overflow:hidden}
.bands i::after{content:"";position:absolute;top:30%;height:40%;left:0;background:linear-gradient(90deg,rgba(47,224,160,.22),rgba(159,232,255,.06));animation:band 9s cubic-bezier(.6,0,.2,1) infinite alternate}
.bands i:nth-child(1)::after{width:62%}.bands i:nth-child(2)::after{width:28%;left:55%;animation-delay:-2s}.bands i:nth-child(3)::after{width:44%;left:20%;animation-delay:-4s}
.bands i:nth-child(4)::after{width:18%;left:70%;animation-delay:-1s}.bands i:nth-child(5)::after{width:75%;animation-delay:-3s}.bands i:nth-child(6)::after{width:33%;left:40%;animation-delay:-5s}
@keyframes band{from{transform:translateX(-12%)}to{transform:translateX(14%)}}
.pagehead{padding:clamp(56px,8vw,110px) 0 40px;border-bottom:6px solid var(--brass)}
.pagehead h1{text-transform:uppercase;font-size:clamp(2.2rem,7vw,6rem);overflow-wrap:break-word}
.chart{display:block;margin:28px 0;padding:clamp(24px,4vw,56px);border:1px solid var(--line);background:linear-gradient(135deg,rgba(18,66,77,.55),rgba(12,45,54,.25));border-top:1px solid var(--line)}
.chart:first-of-type{border-top:1px solid var(--line)}
.chart>aside{display:flex;align-items:baseline;gap:14px;margin-bottom:20px;padding-bottom:12px;border-bottom:1px solid var(--line)}
.chart>aside strong{font-size:.95rem;margin:0;color:var(--abyss);background:var(--brass);padding:2px 8px;font-family:var(--mono)}
.ledger{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,260px),1fr));gap:2px;background:var(--line)}
.ledger li{display:block;padding:26px;background:var(--trench);border:0}
.ledger .d{display:block;font-size:2rem;font-weight:700;margin-bottom:12px}
.ledger h3{margin-bottom:8px}
p,li,dd,summary{overflow-wrap:anywhere}
.btn{text-transform:uppercase;letter-spacing:.06em;font-weight:700}
.tidetable{border-top:6px solid var(--brass)}
.tidetable dl{grid-template-columns:repeat(4,minmax(0,1fr))}
.cookie{border-color:var(--kelp)}
@media (max-width:1180px){.topbar .hrs{display:none}.topnav a{padding:8px 7px;font-size:.68rem}}
@media (max-width:980px){.topnav{display:none}.menubtn{display:inline-flex;margin-left:auto}main{padding-top:0}}
@media (max-width:800px){.tidetable dl{grid-template-columns:1fr}.chart>aside{flex-wrap:wrap}}