/* Plymouth atlas v4. Colours and type are independent design choices, not official brand specifications. */
@font-face{font-family:'Space Grotesk';font-weight:500;font-display:swap;src:url(fonts/space-grotesk-latin-500-normal.woff2) format('woff2')}
@font-face{font-family:'Space Grotesk';font-weight:700;font-display:swap;src:url(fonts/space-grotesk-latin-700-normal.woff2) format('woff2')}
@font-face{font-family:'Atkinson Hyperlegible';font-weight:400;font-display:swap;src:url(fonts/atkinson-hyperlegible-latin-400-normal.woff2) format('woff2');unicode-range:U+0000-00FF,U+2000-206F,U+20AC,U+2122,U+2190-2193}
@font-face{font-family:'Atkinson Hyperlegible';font-weight:700;font-display:swap;src:url(fonts/atkinson-hyperlegible-latin-700-normal.woff2) format('woff2');unicode-range:U+0000-00FF,U+2000-206F,U+20AC,U+2122,U+2190-2193}
@font-face{font-family:'Atkinson Hyperlegible';font-weight:400;font-display:swap;src:url(fonts/atkinson-hyperlegible-latin-ext-400-normal.woff2) format('woff2');unicode-range:U+0100-024F}
@font-face{font-family:'Atkinson Hyperlegible';font-weight:700;font-display:swap;src:url(fonts/atkinson-hyperlegible-latin-ext-700-normal.woff2) format('woff2');unicode-range:U+0100-024F}

:root{
  --mineral:#F5F4EF; --estuary:#123C3B; --sea-glass:#C9E8E1; --copper:#C94D32; --copper-text:#A23B26; --paper:#FFFFFF;
  --stone-zone:#ECE7DC; --sea-zone:#DCEFEA; --paper-zone:#FBF7EF; --muted:#3E5654;
  --font-display:"Space Grotesk","Arial",sans-serif; --font-body:"Atkinson Hyperlegible",system-ui,sans-serif;
  --body-size:clamp(1.0625rem,1rem + .25vw,1.125rem);
  --wrap:1120px; --gutter:clamp(1.1rem,4vw,3rem); --major:clamp(56px,6vw,72px); --near:clamp(20px,2.4vw,32px);
  --r:18px; --headh:64px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-padding-top:calc(var(--headh) + 12px);-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:no-preference){html:not(.rm-on){scroll-behavior:smooth}}
body{margin:0;background:var(--mineral);color:var(--estuary);font:400 var(--body-size)/1.6 var(--font-body)}
img{display:block;max-width:100%;height:auto}
a{color:var(--estuary);text-decoration-color:var(--copper);text-decoration-thickness:2px;text-underline-offset:3px}
a:hover{color:var(--copper-text)}
:focus-visible{outline:3px solid var(--copper-text);outline-offset:3px;border-radius:4px}
h1,h2,h3{font-family:var(--font-display);line-height:1.12;margin:0 0 .5em;font-weight:700}
p{margin:0 0 .9em;max-width:62ch}
p:last-child{margin-bottom:0}
figure{margin:0}
figcaption{font-size:.95rem;line-height:1.45;color:var(--muted);margin-top:.6rem}
.skip{position:absolute;left:1rem;top:-5rem;background:var(--estuary);color:#fff;padding:.7rem 1rem;border-radius:8px;z-index:50}
.skip:focus{top:1rem;color:#fff}
.wrap{max-width:calc(var(--wrap) + 2 * var(--gutter));margin:0 auto;padding:0 var(--gutter)}

/* header */
.top{position:sticky;top:0;z-index:30;display:flex;align-items:center;gap:1.2rem;min-height:var(--headh);padding:.4rem var(--gutter);background:rgba(245,244,239,.96);border-bottom:1px solid rgba(18,60,59,.12)}
.brand{display:flex;flex-direction:column;justify-content:center;min-height:44px;text-decoration:none;line-height:1}
.brand b{font:700 1.35rem/1 var(--font-display);letter-spacing:.04em}
.brand span{font:500 .875rem/1.3 var(--font-display);letter-spacing:.14em;text-transform:uppercase;color:var(--copper-text);white-space:nowrap}
.topnav{display:flex;gap:.3rem;margin-left:auto}
.topnav a{display:inline-flex;align-items:center;gap:.4rem;min-height:44px;padding:.3rem .8rem;border-radius:999px;text-decoration:none;font:500 1rem var(--font-display);white-space:nowrap}
.topnav a i{font-style:normal;color:var(--copper-text);font-weight:700}
.topnav .s{display:none}
.topnav a[aria-current="true"]{background:var(--estuary);color:#fff}
.topnav a[aria-current="true"] i{color:var(--sea-glass)}
.rm{min-height:44px;border:1.5px solid var(--estuary);background:transparent;color:var(--estuary);border-radius:999px;padding:.2rem .9rem;font:500 1rem var(--font-body);cursor:pointer;white-space:nowrap}
.rm[aria-pressed="true"]{background:var(--estuary);color:#fff}

/* opening */
.opening{max-width:calc(var(--wrap) + 2 * var(--gutter));margin:0 auto;padding:var(--near) var(--gutter) var(--major);display:grid;gap:var(--near)}
.wordmark{display:block;font:700 clamp(3.2rem,13vw,6rem)/.9 var(--font-display);letter-spacing:.01em}
.strap{display:block;font:500 clamp(1.05rem,1.6vw,1.4rem)/1.3 var(--font-display);letter-spacing:.2em;text-transform:uppercase;margin-top:.8rem}
.strap::after{content:"";display:block;width:4.5rem;height:3px;background:var(--copper);margin-top:1rem}
.op-text h1{margin-bottom:1rem}
.welcome{font-size:clamp(1.18rem,1.05rem + .5vw,1.4rem);line-height:1.5}
.start{display:inline-flex;align-items:center;gap:.5rem;min-height:48px;margin-top:.4rem;padding:.3rem 1.3rem;border-radius:999px;background:var(--estuary);color:#fff;text-decoration:none;font:700 1.05rem var(--font-display)}
.start:hover{background:var(--copper-text);color:#fff}
.op-art img{border-radius:var(--r);width:100%}

/* zones */
.zone{padding:var(--major) 0}
.zone-stone{background:var(--stone-zone)}
.zone-sea{background:var(--sea-zone)}
.zone-paper{background:var(--paper-zone)}
.zone-head{position:relative;padding-left:1.4rem;margin-bottom:var(--near)}
.zone-head::before{content:"";position:absolute;left:0;top:.5rem;bottom:.2rem;width:3px;border-radius:3px;background:var(--copper)}
.num{font:700 clamp(2rem,3.6vw,2.8rem)/1 var(--font-display);color:var(--copper-text);margin:0 0 .25rem}
.zone-head h2{font-size:clamp(2rem,1.4rem + 2.8vw,3.4rem);text-transform:uppercase;letter-spacing:.01em;margin:0 0 .5rem}
.intro{font-size:clamp(1.12rem,1.02rem + .4vw,1.3rem);line-height:1.55}

/* 01 */
.map picture img{width:100%;border-radius:var(--r)}
.map-key{display:none}
.map-key ol{margin:0;padding:0;list-style:none;counter-reset:k;display:grid;gap:.35rem .9rem}
.map-key li{counter-increment:k;display:flex;align-items:center;gap:.6rem;font-size:1rem}
.map-key li::before{content:counter(k);flex:none;display:grid;place-items:center;width:1.8rem;height:1.8rem;border-radius:50%;background:var(--estuary);color:#fff;font:700 .9rem var(--font-display)}
.key-h{font-size:1rem;text-transform:uppercase;letter-spacing:.1em;margin:0 0 .6rem}
.history{display:grid;grid-template-columns:minmax(0,1fr);gap:var(--near);margin-top:var(--near);padding-top:var(--near);border-top:1px solid rgba(18,60,59,.18)}
.history h3,.link-block h3,.act h3{font-size:clamp(1.25rem,1.1rem + .6vw,1.5rem)}
.history p{font-size:1.02rem}
.bridge{margin-top:var(--near);font:700 clamp(1.15rem,1rem + .5vw,1.35rem)/1.4 var(--font-display);max-width:40ch;padding-left:1.4rem;border-left:3px solid var(--copper)}

/* 02: three linked blocks on one rule */
.chain{position:relative;display:grid;grid-template-columns:minmax(0,1fr);gap:var(--near);padding-left:1.4rem}
.chain::before{content:"";position:absolute;left:0;top:.6rem;bottom:.6rem;width:3px;border-radius:3px;background:var(--copper)}
.link-block{position:relative;display:grid;grid-template-columns:minmax(0,1fr);gap:var(--near);align-items:start;padding-bottom:var(--near);border-bottom:1px solid rgba(18,60,59,.15)}
.link-block:last-child{border-bottom:0;padding-bottom:0}
.link-block::before{content:"";position:absolute;left:calc(-1.4rem - 5px);top:.45rem;width:13px;height:13px;border-radius:50%;background:var(--copper);box-shadow:0 0 0 3px var(--sea-zone)}
.people{font-style:italic;color:var(--muted);font-size:1rem}
.pair-media{display:grid;grid-template-columns:minmax(0,1fr);gap:1rem}
.buoy img{width:min(100%,360px);margin:0 auto}
.tri-labels{list-style:none;margin:.4rem 0 0;padding:0;display:flex;flex-wrap:wrap;justify-content:center;gap:.4rem;font:700 .95rem var(--font-display)}
.tri-labels li{padding:.25rem .8rem;border-radius:999px;background:var(--paper)}
.tri-labels li+li::before{content:"→";margin-right:.5rem;color:var(--copper-text)}
.l4-mobile{display:none}
.stages{list-style:none;margin:0 0 .9em;padding:0;display:grid;gap:.5rem}
.stages li{padding:.55rem .8rem;border-radius:10px;background:rgba(255,255,255,.7);border-left:3px solid transparent;transition:border-color .2s,background .2s}
.stages li b{font-family:var(--font-display);color:var(--copper-text)}
.stages li.hl{border-left-color:var(--copper);background:#fff}
.vessel img{width:min(100%,400px);margin:0 auto}
.diagram{display:block;width:100%;height:auto}
.diagram .d-sea{fill:var(--sea-glass)}
.diagram .d-wave{fill:none;stroke:#fff;stroke-width:1.5;opacity:.5}
.diagram .d-land{fill:#E7E3D8;stroke:var(--estuary);stroke-width:1.4}
.diagram .d-meadow{fill:#9DBB86;opacity:.5}
.diagram .d-bldg{fill:var(--paper);stroke:var(--estuary);stroke-width:2}
.diagram .d-lanes{fill:none;stroke:var(--estuary);stroke-width:2;stroke-dasharray:8 7;opacity:.6}
.diagram .d-swath{fill:#E9B84C;opacity:.6}
.diagram .hull{fill:#fff;stroke:var(--estuary);stroke-width:2}.diagram .deck{fill:var(--estuary)}.diagram .mast{fill:var(--copper)}
.diagram .d-ring{fill:none;stroke:var(--copper);stroke-width:2;stroke-dasharray:3 6}
.diagram .d-link{fill:none;stroke:var(--estuary);stroke-width:2;stroke-dasharray:4 6}
.diagram .d-sample{fill:#fff;stroke:var(--estuary);stroke-width:2}
.diagram .d-plus{stroke:var(--copper);stroke-width:2.5}
.diagram .d-lens{fill:rgba(255,255,255,.35);stroke:var(--estuary);stroke-width:4}
.diagram .d-lens-h{stroke:var(--estuary);stroke-width:7;stroke-linecap:round}
.diagram .d-edge{fill:none;stroke:var(--copper);stroke-width:4}
.diagram .d-card{fill:#fff;stroke:var(--estuary);stroke-width:2}
.diagram .d-mini{fill:#9DBB86;opacity:.6;stroke:var(--copper);stroke-width:3}
.diagram .d-cardline{stroke:var(--estuary);stroke-width:3;opacity:.4}
.diagram .badge circle{fill:var(--estuary);stroke:#fff;stroke-width:4}
.diagram .badge text{fill:#fff;font:700 32px var(--font-display)}
.diagram .stage{transition:opacity .25s}
.diagram-fig[data-hl] .stage{opacity:.25}
.diagram-fig[data-hl="1"] .stage[data-stage="1"],.diagram-fig[data-hl="2"] .stage[data-stage="2"],.diagram-fig[data-hl="3"] .stage[data-stage="3"],.diagram-fig[data-hl="4"] .stage[data-stage="4"]{opacity:1}
.dome img{border-radius:var(--r)}
.annot{list-style:none;margin:.6rem 0 0;padding:0;display:flex;flex-wrap:wrap;gap:.4rem}
.annot li{padding:.25rem .8rem;border-radius:999px;background:var(--paper);font:700 .95rem var(--font-display);border:1.5px solid var(--estuary)}
.steam{margin:var(--near) 0 .3rem;padding-left:1.4rem;font:700 clamp(1.1rem,1rem + .5vw,1.35rem)/1.4 var(--font-display);max-width:44ch}
.coda{font-style:italic;color:var(--muted);padding-left:1.4rem}

/* 03 */
.fit{width:100%;border-collapse:collapse;margin:0 0 var(--near)}
.fit thead th{text-align:left;font:700 .9rem var(--font-display);text-transform:uppercase;letter-spacing:.1em;color:var(--copper-text);padding:0 1rem .6rem 0;border-bottom:2px solid var(--estuary)}
.fit tbody th,.fit td{text-align:left;vertical-align:top;padding:1rem 1rem 1rem 0;border-bottom:1px solid rgba(18,60,59,.18)}
.fit tbody th{font:700 1.15rem/1.3 var(--font-display);width:26%}
.fit td:last-child{font-weight:700;width:30%}
.fit tbody tr{transition:background .2s}
.fit tbody tr:hover{background:rgba(201,232,225,.4)}
.routes{margin-bottom:var(--near)}
.act{padding:var(--near) 0 0;border-top:1px solid rgba(18,60,59,.18)}
.adventure{margin:var(--major) 0 .2rem;font:700 clamp(1.6rem,1.2rem + 1.8vw,2.6rem)/1.15 var(--font-display);text-transform:uppercase;letter-spacing:.02em}
.close{font-size:1.2rem}

/* footer */
.foot{background:var(--estuary);color:#E8F2EF;padding:var(--major) 0}
.foot a{color:#fff;text-decoration-color:var(--sea-glass)}
.foot summary{cursor:pointer;min-height:44px;display:flex;align-items:center;font:700 1.05rem var(--font-display)}
.src{padding-left:1.1rem;font-size:.98rem}.src li{margin-bottom:.4rem}

/* motion */
@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important}}
html.rm-on *,html.rm-on *::before,html.rm-on *::after{animation:none!important;transition:none!important}

/* wider screens */
@media (min-width:800px){
  .history{grid-template-columns:repeat(3,1fr)}
  .pair{grid-template-columns:minmax(0,1.05fr) minmax(0,1fr)}
}
@media (min-width:1000px){
  .opening{grid-template-columns:minmax(0,1fr) minmax(0,1.55fr);align-items:center}
  /* Approachable AI integration fix: the wordmark was sized by the viewport,
     but .opening is capped, so its text column stops growing at about 427px
     while 5.4vw kept growing to 5.8rem. Above ~1520px "PLYMOUTH" (5.21em in
     Space Grotesk) ran past the column and under the image. The same size is
     now also capped by the column itself: 18.5cqi keeps the word at 96% of
     the column, and leaves the clamp in charge wherever it already fitted. */
  .op-text{container-type:inline-size}
  .wordmark{font-size:min(clamp(3.4rem,5.4vw,5.8rem),18.5cqi)}
  .op-art{margin-right:calc(-1 * var(--gutter) + .5rem)}
}
/* Approachable AI fix, the same idea below 1000px: with enlarged text the
   3.2rem floor made "PLYMOUTH" wider than a phone, and the single-column
   grid stretched to it, carrying the hero image off-screen. The word is now
   also capped at 19cqi of its column (99% of it); at the default text size
   the clamp still wins from 320px up. The button's side padding gives way the
   same way so "exploring ↓" keeps fitting; it is unchanged from 320px up. */
@media (max-width:999px){
  .op-text{container-type:inline-size}
  .wordmark{font-size:min(clamp(3.2rem,13vw,6rem),19cqi)}
  .start{padding-left:min(1.3rem,6.5vw);padding-right:min(1.3rem,6.5vw)}
}
/* phones and small tablets */
@media (max-width:799px){
  .map picture img{width:min(100%,640px);margin:0 auto}
  .map-key{display:block;margin-top:var(--near)}
  .map-key ol{grid-template-columns:1fr 1fr}
  .l4-mobile{display:block}
  .l4-mobile img{border-radius:var(--r);width:min(100%,480px)}
  .fit thead{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
  .fit,.fit tbody,.fit tr,.fit th,.fit td{display:block;width:auto!important}
  .fit tr{padding:1rem 0;border-bottom:1px solid rgba(18,60,59,.18)}
  .fit tbody th,.fit td{padding:0;border:0}
  .fit tbody th{font-size:1.2rem;margin-bottom:.4rem}
  .fit td::before{content:attr(data-h);display:block;font:700 .875rem var(--font-display);text-transform:uppercase;letter-spacing:.1em;color:var(--copper-text);margin-top:.5rem}
}
@media (max-width:699px){
  :root{--headh:auto}
  body{font-size:1.0625rem}
  .top{flex-wrap:wrap;gap:.3rem .8rem;padding:.45rem 1rem}
  .topnav{order:3;width:100%;margin:0;gap:.1rem}
  .topnav a{padding:.25rem .6rem}
  .rm{margin-left:auto;font-size:.9375rem;padding:.1rem .75rem}
  html{scroll-padding-top:118px}
  .op-art{margin:0 calc(-1 * var(--gutter))}
  .op-art img{border-radius:0;aspect-ratio:4/3;object-fit:cover;object-position:50% 38%}
  .op-art figcaption{padding:0 var(--gutter)}
}
@media (max-width:480px){ .topnav .l{display:none}.topnav .s{display:inline} }
@media (max-width:400px){ .topnav a{padding:.25rem .35rem;font-size:.875rem;gap:.2rem} .map-key ol{grid-template-columns:1fr} }
@media (min-width:700px) and (max-width:999px){ .top{flex-wrap:wrap;gap:.3rem 1rem} .topnav{order:3;width:100%;margin:0} .rm{margin-left:auto} html{scroll-padding-top:120px} }
@media print{.top,.rm{display:none}}

.cap-m{display:none}
@media (max-width:799px){.cap-m{display:inline}}