/* Heron's space: a pond at dawn (light) and at dusk (dark). Plain CSS; no inline styles are needed anywhere (the CSP forbids them).
   Tokens first. Two palettes. The pond scene (canvas) reads the --sky/--water/... tokens, so it follows the theme too. */
:root{
  --sky1:#cfe3ea;--sky2:#f6efdf;--sun:#f2c879;--hill:#b4c5c8;--reed1:#7a9585;--reed2:#4a6a5e;--water1:#c3dce0;--water2:#6aa0b0;--bird:#1f3a45;--beak:#d89a3a;--fish:#d9743a;
  --mist:#eaf2f2;--deep:#7fb0bd;--paper:#fbfaf6;--card:#fffdf8;--ink:#12252c;--mut:#3f565e;--rule:#cdd9d9;--link:#0c5a75;--ox:#b4532a;--ox-soft:#f1e6d6;--focus:#0b57d0;--shadow:0 10px 40px rgba(18,37,44,.14);
  --display:"Avenir Next","Segoe UI Variable Display","Segoe UI","Helvetica Neue",Arial,sans-serif;
  --body:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --depth:0;
}
@media (prefers-color-scheme:dark){:root{
  --sky1:#09171e;--sky2:#2b4650;--sun:#e0a050;--hill:#1b2f38;--reed1:#27433f;--reed2:#112422;--water1:#18343e;--water2:#071217;--bird:#d3e4ea;--beak:#e3a553;--fish:#ee955c;
  --mist:#0e1e25;--deep:#03080b;--paper:#14232a;--card:#192b33;--ink:#e5eef1;--mut:#a9bcc3;--rule:#2b3d45;--link:#82c8e2;--ox:#f0a878;--ox-soft:#223840;--focus:#8ab4f8;--shadow:0 10px 40px rgba(0,0,0,.45)}}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation:none!important;transition:none!important}}
body{margin:0;color:var(--ink);font:1.0625rem/1.72 var(--body);background:var(--mist);background:color-mix(in srgb,var(--mist) calc((1 - var(--depth)) * 100%),var(--deep));min-height:100vh}
a{color:var(--link);text-underline-offset:.2em}a:hover{text-decoration-thickness:2px}
:focus-visible{outline:3px solid var(--focus);outline-offset:3px;border-radius:4px}
.skip{position:absolute;left:-999px;top:0;background:var(--ink);color:var(--paper);padding:.6rem 1rem;z-index:50}.skip:focus{left:.5rem;top:.5rem}
.sr{position:absolute;left:-999px;width:1px;height:1px;overflow:hidden}

/* top bar */
.bar{position:relative;z-index:6}
.bar>div{max-width:72rem;margin:0 auto;padding:.7rem 1.2rem;display:flex;flex-wrap:wrap;gap:.2rem 1.6rem;align-items:center}
.name{font:600 1.15rem/1 var(--display);letter-spacing:.32em;text-transform:uppercase;color:var(--ink);text-decoration:none;margin-right:auto;padding:.7rem 0}
.bar nav ul{display:flex;flex-wrap:wrap;gap:0 .2rem;margin:0;padding:0;list-style:none}
.bar nav a{display:inline-block;padding:.7rem .75rem;min-height:44px;font:500 .95rem var(--display);letter-spacing:.04em;color:var(--ink);text-decoration:none;border-radius:999px}
.bar nav a:hover,.bar nav a[aria-current=page]{background:rgba(255,255,255,.55);background:color-mix(in srgb,var(--paper) 70%,transparent)}

/* small screens: a single scrolling row of links keeps the bar to one line */
@media (max-width:700px){.bar>div{flex-wrap:nowrap;flex-direction:column;align-items:flex-start;gap:0}.bar nav{max-width:100%;overflow-x:auto;scrollbar-width:none}.bar nav ul{flex-wrap:nowrap}.bar nav a{white-space:nowrap}.name{padding:.55rem 0 .1rem}}

/* ---------- home: the pond ---------- */
.pond{position:relative;height:min(92vh,760px);min-height:560px;overflow:hidden;margin-top:-4.4rem;isolation:isolate}
@media (max-width:700px){.pond{height:auto;min-height:100svh}}
#pond{position:absolute;inset:0;width:100%;height:100%;display:block;z-index:0}
.pond .over{position:relative;z-index:2;height:100%;max-width:72rem;margin:0 auto;padding:6.4rem 1.2rem 1.4rem;display:flex;flex-direction:column;justify-content:space-between;pointer-events:none}
.pond .over>*{pointer-events:auto}
.kicker{font:600 .85rem var(--display);letter-spacing:.28em;text-transform:uppercase;color:var(--mut);margin:0 0 .6rem}
.pond h1{font:300 clamp(2.6rem,9.5vw,6.6rem)/.95 var(--display);letter-spacing:-.03em;margin:0 0 1rem;color:var(--ink)}
.pond h1 em{font-style:normal;font-weight:700}
.pond .sub{font:400 clamp(1.05rem,2.2vw,1.35rem)/1.5 var(--body);max-width:30rem;color:var(--ink);margin:0}
.buoys ul{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:.9rem 1.1rem}
.buoy{display:grid;place-items:center;width:6.2rem;height:6.2rem;border-radius:50%;text-align:center;text-decoration:none;color:var(--ink);background:var(--paper);border:3px solid var(--ink);padding-bottom:.45rem;box-shadow:inset 0 -.4rem 0 var(--ox),var(--shadow);font:600 .74rem/1.15 var(--display);letter-spacing:0;animation:bob 4.4s ease-in-out infinite;transition:transform .2s}
.buoys li:nth-child(2) .buoy{animation-delay:-1.1s}.buoys li:nth-child(3) .buoy{animation-delay:-2.2s}.buoys li:nth-child(4) .buoy{animation-delay:-3.3s}.buoys li:nth-child(5) .buoy{animation-delay:-.6s}
.buoy:hover,.buoy:focus-visible{transform:translateY(-6px) scale(1.06);animation-play-state:paused}
.buoy small{display:block;font:500 .64rem var(--mono);color:var(--mut);margin-top:.15rem}
@keyframes bob{0%,100%{transform:translateY(0) rotate(-2deg)}50%{transform:translateY(7px) rotate(2deg)}}
.catch{position:absolute;right:max(1.2rem,calc((100vw - 72rem)/2 + 1.2rem));bottom:1.4rem;z-index:3;width:min(18rem,calc(100% - 2.4rem));background:var(--paper);border:2px solid var(--ink);border-radius:14px;padding:.8rem 1rem;box-shadow:var(--shadow);font:.95rem/1.45 var(--body);pointer-events:auto}
.catch[hidden]{display:none}
.catch .x{position:absolute;right:.35rem;top:.25rem;min-height:2rem;width:2rem;padding:0;border:0;background:transparent;font:700 1.3rem/1 var(--display);color:var(--mut);border-radius:50%}
@media (max-width:700px){.catch{left:1.2rem;right:1.2rem;width:auto;bottom:auto;top:5.2rem}}
.catch b{display:block;font:700 .72rem var(--display);letter-spacing:.2em;text-transform:uppercase;color:var(--ox);margin-bottom:.25rem}
.catch p{margin:0 0 .3rem}.catch a{font-weight:600}
.pondtools{display:flex;flex-wrap:wrap;gap:.6rem;margin-top:.8rem}
.pondtools button{font:600 .85rem var(--display);letter-spacing:.04em;padding:.55rem .95rem;min-height:44px;border:2px solid var(--ink);background:var(--paper);color:var(--ink);border-radius:999px;cursor:pointer}
.pondtools button:hover{background:var(--ox-soft)}.pondtools button[aria-pressed=true]{background:var(--ink);color:var(--paper)}

/* ---------- sections on the home page ---------- */
.shore{background:var(--paper);position:relative;z-index:3;padding:3.2rem 0 1rem;box-shadow:0 -14px 30px rgba(0,0,0,.08)}
.shore .in,.in{max-width:72rem;margin:0 auto;padding:0 1.2rem}
.sec{padding:2.6rem 0}
.sec>h2,.panel h2{font:300 clamp(1.8rem,4.5vw,2.8rem)/1.1 var(--display);letter-spacing:-.02em;margin:0 0 .4rem}
.sec>h2 b,.panel h2 b{font-weight:700}
.eyebrow{font:600 .8rem var(--display);letter-spacing:.26em;text-transform:uppercase;color:var(--ox);margin:0 0 .35rem}
.lede{font-size:1.2rem;color:var(--ink);max-width:40rem}
.twocol{display:grid;gap:2.2rem;grid-template-columns:1fr}
@media (min-width:900px){.twocol{grid-template-columns:5fr 6fr;align-items:start}}

/* tide table */
.tide{list-style:none;margin:1.4rem 0 0;padding:0;border-top:3px solid var(--ink)}
.tide li{display:grid;grid-template-columns:3.4rem 1fr;gap:.2rem 1rem;padding:1.1rem 0;border-bottom:1px solid var(--rule)}
.tide .no{font:600 1.5rem var(--mono);color:var(--ox);grid-row:span 3}
.tide a.t{font:600 1.25rem/1.25 var(--display);color:var(--ink);text-decoration:none}.tide a.t:hover{color:var(--link);text-decoration:underline}
.tide p{margin:.2rem 0 0;color:var(--mut);font-size:1rem}
.tide .meta{font:500 .8rem var(--mono);color:var(--mut);display:flex;flex-wrap:wrap;gap:.3rem .9rem;align-items:center}
.rings{display:inline-flex;gap:3px;vertical-align:middle}.rings i{display:block;width:.8rem;height:.8rem;border:2px solid var(--ox);border-radius:50%}
.verdict{padding:.08rem .55rem;border-radius:999px;border:1.5px solid currentColor;font:600 .72rem var(--display);letter-spacing:.08em;text-transform:uppercase}
.v-held{color:#1f6d3a}.v-part{color:#8a5a00}.v-fail{color:#a32a22}
@media (prefers-color-scheme:dark){.v-held{color:#7fd39a}.v-part{color:#f0c060}.v-fail{color:#ff9a90}}

/* flock */
.flock{display:grid;gap:1.1rem;grid-template-columns:1fr}
@media (min-width:760px){.flock{grid-template-columns:repeat(3,1fr)}}
.bird{display:block;background:var(--card);border:2px solid var(--ink);border-radius:18px;padding:1.2rem 1.2rem 1.1rem;color:var(--ink);text-decoration:none;transition:transform .2s,box-shadow .2s}
a.bird:hover{transform:translateY(-4px) rotate(-.4deg);box-shadow:var(--shadow)}
.bird svg{display:block;width:5rem;height:4rem;margin-bottom:.4rem;color:var(--ink)}
.bird h3{font:700 1.2rem var(--display);margin:0 0 .2rem;letter-spacing:.02em}.bird p{margin:0;font-size:.98rem;color:var(--mut)}
.bird.here{border-style:dashed}

/* ---------- inner pages: a dive ---------- */
.band{height:11rem;margin-top:-4.4rem;background:linear-gradient(180deg,var(--sky1),var(--sky2));position:relative;overflow:hidden}
.band::after{content:"";position:absolute;inset:auto 0 0 0;height:5.4rem;background:var(--water1) url(waves.svg) repeat-x bottom/ 900px 100%;opacity:.95}
.wrap{display:grid;grid-template-columns:minmax(0,1fr);max-width:80rem;margin:-3rem auto 0;padding:0 1.2rem 3rem;position:relative;z-index:2}
@media (min-width:1060px){.wrap{grid-template-columns:11rem minmax(0,48rem) 1fr;gap:0 2rem}}
.panel{background:var(--paper);border-radius:22px;box-shadow:var(--shadow);padding:clamp(1.3rem,4vw,2.8rem);min-width:0}
.panel>h1{font:300 clamp(2rem,6vw,3.4rem)/1.05 var(--display);letter-spacing:-.025em;margin:.2rem 0 1rem}
.panel>h1 b{font-weight:700}
.panel h2{margin-top:2.4rem;padding-top:.5rem;border-top:1px solid var(--rule);font-size:clamp(1.35rem,3vw,1.8rem);font-weight:600}
.panel h3{font:700 1.1rem var(--display);margin:1.6rem 0 .4rem}
.panel p{margin:0 0 1.1rem}
.panel .eyebrow{margin-top:.4rem}
.notice{border-radius:14px;background:var(--ox-soft);border-left:6px solid var(--ox);padding:.8rem 1.1rem;margin:1.2rem 0}.notice p{margin:0}
.gauge{display:none}
@media (min-width:1060px){.gauge{display:block;position:sticky;top:1.4rem;align-self:start;margin-top:3.6rem;font:500 .82rem/1.35 var(--display)}}
.gauge .tube{position:relative;height:min(52vh,26rem);width:1.1rem;border:2.5px solid var(--ink);border-radius:999px;background:var(--paper);overflow:hidden;margin:0 0 .8rem .15rem}
.gauge .fill{position:absolute;left:0;right:0;bottom:0;height:calc(var(--depth) * 100%);background:var(--link);opacity:.85}
.gauge .read{font:700 1.5rem var(--mono);color:var(--ink);margin:0}.gauge .read small{font:500 .7rem var(--mono);color:var(--mut);display:block}
.gauge ol{list-style:none;margin:1rem 0 0;padding:0}.gauge li{margin:.15rem 0}
.gauge a{display:block;padding:.25rem .4rem;border-left:3px solid transparent;color:var(--mut);text-decoration:none;border-radius:0 8px 8px 0}
.gauge a:hover{color:var(--ink)}.gauge a[aria-current=true]{color:var(--ink);border-left-color:var(--ox);background:var(--ox-soft);font-weight:700}
.progress{position:fixed;left:0;top:0;height:4px;width:calc(var(--depth) * 100%);background:var(--ox);z-index:40}
@media (min-width:1060px){.progress{display:none}}

/* tables, code, quotes */
table{border-collapse:collapse;width:100%;font:.92rem/1.5 var(--body);display:block;overflow-x:auto;margin:1rem 0}
th,td{border-bottom:1px solid var(--rule);padding:.5rem .6rem;text-align:left;vertical-align:top;overflow-wrap:normal;word-break:normal;hyphens:none}
th{background:var(--ox-soft);font-family:var(--display)}
td code{white-space:nowrap}
code{font:.88em var(--mono);background:var(--ox-soft);padding:.05rem .3rem;border-radius:4px;overflow-wrap:anywhere}
pre{background:var(--ox-soft);padding:.9rem 1.1rem;overflow-x:auto;border-radius:10px}pre code{background:none;padding:0}
blockquote{margin:1.2rem 0;padding:.2rem 1.1rem;border-left:4px solid var(--rule);color:var(--mut)}
.panel p,.panel li,.panel blockquote,.panel dd{overflow-wrap:anywhere}
ol,ul{padding-left:1.4rem}li{margin:.3rem 0}
hr{border:0;border-top:1px solid var(--rule);margin:2.2rem 0}
p>em:only-child{font-style:normal;color:var(--mut)}p>em:only-child strong{color:var(--ink)}
.pager{display:flex;flex-wrap:wrap;gap:.4rem 1.6rem;list-style:none;padding:0;margin:2.4rem 0 0;font:600 1rem var(--display)}
.entries{list-style:none;padding:0;margin:1.2rem 0}

/* the instrument */
.toyframe{margin:1.4rem 0 2rem}
.toyframe canvas{display:block;width:100%;max-width:640px;height:auto;border:2px solid var(--ink);border-radius:14px;background:var(--card);touch-action:none}
#fr-app{aspect-ratio:640/300;cursor:grab}#fr-app:active{cursor:grabbing}
#fr-chart{aspect-ratio:640/270;margin-top:1.2rem;touch-action:auto}
.controls{max-width:640px;margin:1rem 0}
.controls label{display:block;margin-top:.9rem;font:500 1rem/1.4 var(--display)}
.controls input[type=range]{width:100%;min-height:44px;accent-color:var(--ox)}
.hint{color:var(--mut);font-size:.88rem;font-family:var(--body)}
.buttons{display:flex;flex-wrap:wrap;gap:.6rem;margin:1rem 0 0}
button{font:600 1rem var(--display);padding:.6rem 1.1rem;min-height:44px;border:2px solid var(--ink);background:var(--card);color:var(--ink);border-radius:999px;cursor:pointer}
button:hover{background:var(--ox-soft)}button[aria-pressed=true]{background:var(--ink);color:var(--paper)}
.say{font:1rem/1.5 var(--body);background:var(--ox-soft);border-left:6px solid var(--ox);border-radius:0 14px 14px 0;padding:.7rem 1rem;margin:1rem 0 0;max-width:640px}
.ox{color:var(--ox)}

/* footer */
.foot{margin-top:2rem;background:var(--ink);color:var(--paper);position:relative;z-index:3}
.foot>div{max-width:72rem;margin:0 auto;padding:1.6rem 1.2rem 2.4rem;font:.95rem/1.6 var(--body)}
.foot p{margin:0 0 .5rem}.foot a{color:inherit}
@media (prefers-color-scheme:dark){.foot{background:#02060a;color:var(--ink);border-top:1px solid var(--rule)}}