/* ============================================================
   water.nelsonjatel.com  ·  Node and Trace design system
   Tokens copied from nelsonjatel/src/styles/global.css.
   Layout: masthead, intro, tab rail, 3D stage, readouts, notes.
   ============================================================ */

@font-face{font-family:'Instrument Serif';font-style:normal;font-weight:400;font-display:swap;src:url(/fonts/instrument-serif-latin-400-normal.woff2) format('woff2');unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:'Instrument Serif';font-style:normal;font-weight:400;font-display:swap;src:url(/fonts/instrument-serif-latin-ext-400-normal.woff2) format('woff2');unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+1E00-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}
@font-face{font-family:'Instrument Sans';font-style:normal;font-weight:400;font-display:swap;src:url(/fonts/instrument-sans-latin-400-normal.woff2) format('woff2');unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:'Instrument Sans';font-style:normal;font-weight:400;font-display:swap;src:url(/fonts/instrument-sans-latin-ext-400-normal.woff2) format('woff2');unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+1E00-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}
@font-face{font-family:'Instrument Sans';font-style:normal;font-weight:600;font-display:swap;src:url(/fonts/instrument-sans-latin-600-normal.woff2) format('woff2');unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:'Instrument Sans';font-style:normal;font-weight:600;font-display:swap;src:url(/fonts/instrument-sans-latin-ext-600-normal.woff2) format('woff2');unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+1E00-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}
@font-face{font-family:'IBM Plex Mono';font-style:normal;font-weight:400;font-display:swap;src:url(/fonts/ibm-plex-mono-latin-400-normal.woff2) format('woff2');unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:'IBM Plex Mono';font-style:normal;font-weight:400;font-display:swap;src:url(/fonts/ibm-plex-mono-latin-ext-400-normal.woff2) format('woff2');unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+1E00-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}
@font-face{font-family:'IBM Plex Mono';font-style:normal;font-weight:500;font-display:swap;src:url(/fonts/ibm-plex-mono-latin-500-normal.woff2) format('woff2');unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:'IBM Plex Mono';font-style:normal;font-weight:500;font-display:swap;src:url(/fonts/ibm-plex-mono-latin-ext-500-normal.woff2) format('woff2');unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+1E00-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}

:root{
  color-scheme:dark;
  /* site tokens */
  --ground-deep:#08202B;
  --ground:#0E2A38;
  --ground-soft:#0C2E3D;
  --ink:#EAF2F4;
  --slate:#7FA0AB;
  --recessive:#5E7A84;
  --node:#4A6E7C;
  --signal:#F3B24E;
  --signal-hi:#FFD27A;
  --hairline:#26424C;
  --font-display:'Instrument Serif', Georgia, serif;
  --font-body:'Instrument Sans', system-ui, -apple-system, sans-serif;
  --font-mono:'IBM Plex Mono', ui-monospace, 'SFMono-Regular', monospace;
  --maxw:1200px;
  --gutter:clamp(1rem, 4vw, 3rem);
  /* data encodings (match C in js/app.js) */
  --warm:#F3B24E;   /* deeper / warmer */
  --cool:#5CB8D6;   /* rising / cooler */
  --pass:#7FD1A8;
}

*,*::before,*::after{box-sizing:border-box}
*{margin:0}
html{-webkit-text-size-adjust:100%}
body{background:var(--ground-deep);color:var(--ink);font-family:var(--font-body);font-size:1rem;line-height:1.55;-webkit-font-smoothing:antialiased;min-height:100dvh}
a{color:var(--signal);text-decoration:none;text-underline-offset:.18em}
a:hover{color:var(--signal-hi);text-decoration:underline}
button{font:inherit;cursor:pointer}
:focus-visible{outline:2px solid var(--signal-hi);outline-offset:2px}

.skip{position:absolute;left:-999px;top:8px;background:var(--signal);color:var(--ground-deep);padding:8px 12px;border-radius:6px;z-index:10}
.skip:focus{left:12px}

.wrap{max-width:var(--maxw);margin-inline:auto;padding-left:max(var(--gutter), env(safe-area-inset-left,0px));padding-right:max(var(--gutter), env(safe-area-inset-right,0px))}

.vh{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.ext{font-size:.85em;margin-left:.3em;color:var(--slate)}

/* ---- masthead: brand, Datasets dropdown, search ---------------------- */
.masthead{position:sticky;top:0;z-index:20;border-bottom:1px solid var(--hairline);background:rgba(14,42,56,.94);backdrop-filter:blur(8px)}
.masthead-in{max-width:var(--maxw);margin-inline:auto;padding:10px var(--gutter);display:flex;align-items:center;justify-content:space-between;gap:10px 20px;flex-wrap:wrap}
.brand-pair{display:flex;align-items:baseline;gap:10px;flex-wrap:wrap}
.brand{font-family:var(--font-display);font-size:1.375rem;color:var(--ink)}
.brand:hover{color:var(--ink);text-decoration:none}
.site-name{font-family:var(--font-mono);font-size:.75rem;letter-spacing:.12em;text-transform:uppercase;color:var(--signal)}
.site-name::before{content:"·";color:var(--slate);margin-right:10px}
.mast-nav{display:flex;align-items:center;gap:10px;flex:1 1 360px;justify-content:flex-end}

.no-js .dd, .no-js .search{display:none}
.js .dd-fallback{display:none}
.dd-fallback{color:var(--slate)}
.dd{position:relative}
.dd-btn{display:inline-flex;align-items:center;gap:8px;min-height:44px;padding:0 14px;border:1px solid var(--recessive);border-radius:999px;background:transparent;color:var(--ink);font-size:.9375rem}
.dd-btn:hover{border-color:var(--node)}
.chev{width:7px;height:7px;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:translateY(-2px) rotate(45deg);transition:transform .15s}
.dd-btn[aria-expanded="true"] .chev{transform:translateY(1px) rotate(-135deg)}
.dd-menu{position:absolute;right:0;top:calc(100% + 8px);width:min(340px, calc(100vw - 32px));background:var(--ground);border:1px solid var(--hairline);border-radius:12px;padding:8px;box-shadow:0 18px 40px rgba(0,0,0,.45)}
.dd-menu ul{list-style:none;padding:0}
.dd-head{font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.14em;text-transform:uppercase;color:var(--slate);padding:10px 10px 4px}
.dd-menu a{display:flex;justify-content:space-between;align-items:baseline;gap:12px;padding:10px;border-radius:8px;color:var(--ink);min-height:44px}
.dd-menu a:hover,.dd-menu a:focus-visible{background:var(--ground-soft);text-decoration:none;color:var(--ink)}
.dd-menu a[aria-current="page"]{color:var(--signal)}
.dd-r{font-family:var(--font-mono);font-size:.6875rem;color:var(--slate);text-transform:uppercase;letter-spacing:.08em}
.dd-all{border-top:1px solid var(--hairline);margin-top:6px;border-radius:0 0 8px 8px!important;color:var(--signal)!important}

.search{position:relative;flex:0 1 300px;min-width:0}
.search input{width:100%;min-height:44px;padding:0 38px 0 14px;border-radius:999px;border:1px solid var(--recessive);background:var(--ground-deep);color:var(--ink);font:inherit;font-size:.9375rem}
.search input::placeholder{color:var(--slate)}
.search input:focus{border-color:var(--signal);outline:none;box-shadow:0 0 0 3px rgba(243,178,78,.25)}
.q-key{position:absolute;right:12px;top:50%;transform:translateY(-50%);font:400 .75rem var(--font-mono);color:var(--slate);border:1px solid var(--hairline);border-radius:4px;padding:1px 6px;pointer-events:none}
.search input:focus + .q-key{display:none}
.q-list{position:absolute;left:0;right:0;top:calc(100% + 8px);list-style:none;padding:6px;background:var(--ground);border:1px solid var(--hairline);border-radius:12px;box-shadow:0 18px 40px rgba(0,0,0,.45);max-height:60vh;overflow:auto;min-width:280px}
.q-list [role=option]{display:flex;flex-direction:column;gap:2px;padding:10px;border-radius:8px;cursor:pointer}
.q-list [role=option][aria-selected="true"],.q-list [role=option]:hover{background:var(--ground-soft)}
.q-list [role=option][aria-selected="true"] .q-t{color:var(--signal)}
.q-t{color:var(--ink)}
.q-k{font-family:var(--font-mono);font-size:.6875rem;color:var(--slate);text-transform:uppercase;letter-spacing:.08em}
.q-none{padding:10px;color:var(--slate);font-size:.875rem}
@media (max-width:640px){
  .mast-nav{flex-basis:100%;justify-content:stretch}
  .search{flex:1 1 auto}
  .q-key{display:none}
  /* anchor the menu to the full-width sticky header, not the button */
  .dd{position:static}
  .dd-menu{left:var(--gutter);right:var(--gutter);width:auto;top:calc(100% + 4px)}
}

/* ---- splash ---------------------------------------------------------- */
.home main{display:block}
.hero{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:clamp(24px,4vw,56px);align-items:center;padding-block:clamp(32px,6vw,72px)}
.hero h1{font-family:var(--font-display);font-weight:400;font-size:clamp(2.75rem,7vw,4.5rem);line-height:1;margin-top:10px;text-wrap:balance}
.hero-lede{font-size:1.125rem;color:var(--ink);margin-top:18px;max-width:46ch}
.hero-note{color:var(--slate);margin-top:12px;max-width:46ch;font-size:.9375rem}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap;margin-top:26px}
.btn{display:inline-flex;align-items:center;min-height:48px;padding:0 20px;border-radius:999px;font-weight:600;border:1px solid transparent}
.btn-primary{background:var(--signal);color:var(--ground-deep)}
.btn-primary:hover{background:var(--signal-hi);color:var(--ground-deep);text-decoration:none}
.btn-ghost{border-color:var(--hairline);color:var(--ink)}
.btn-ghost:hover{border-color:var(--node);color:var(--ink);text-decoration:none}
.hero-fig a{display:block;border-radius:14px;overflow:hidden;border:1px solid var(--hairline);background:var(--ground-deep)}
.hero-fig img{display:block;width:100%;height:auto;aspect-ratio:16/10;object-fit:cover;transition:transform .4s}
.hero-fig a:hover img{transform:scale(1.015)}
.hero-fig figcaption{font:400 .75rem/1.4 var(--font-mono);color:var(--slate);margin-top:10px}
@media (max-width:959px){.hero{grid-template-columns:1fr}.hero-fig{order:-1}}

.datasets{padding-block:8px 72px}
.ds-head{display:flex;justify-content:space-between;align-items:end;gap:14px 24px;flex-wrap:wrap;border-top:1px solid var(--hairline);padding-top:28px;scroll-margin-top:90px}
.ds-head h2{font-family:var(--font-display);font-weight:400;font-size:clamp(1.875rem,4vw,2.25rem)}
.ds-tools{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.chips{display:flex;gap:6px;flex-wrap:wrap}
.chip{min-height:40px;padding:0 14px;border-radius:999px;border:1px solid var(--recessive);background:transparent;color:var(--slate);font:500 .75rem/1 var(--font-mono);letter-spacing:.1em;text-transform:uppercase}
.chip:hover{color:var(--ink);border-color:var(--node)}
.chip[aria-pressed="true"]{background:var(--signal);border-color:var(--signal);color:var(--ground-deep)}
.no-js .ds-tools{display:none}
.ds-q{min-height:40px;padding:0 14px;border-radius:999px;border:1px solid var(--recessive);background:var(--ground-deep);color:var(--ink);font:inherit;font-size:.9375rem;width:200px}
.ds-q:focus{border-color:var(--signal);outline:none;box-shadow:0 0 0 3px rgba(243,178,78,.25)}
.cards{list-style:none;padding:0;margin-top:22px;display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,300px),1fr));gap:18px}
.card a{display:flex;flex-direction:column;height:100%;border:1px solid var(--hairline);border-radius:14px;overflow:hidden;background:var(--ground);color:var(--ink);transition:border-color .15s, transform .15s}
.card a:hover,.card a:focus-visible{border-color:var(--signal);text-decoration:none;color:var(--ink);transform:translateY(-2px)}
.card img{width:100%;height:auto;aspect-ratio:16/10;object-fit:cover;background:var(--ground-deep);border-bottom:1px solid var(--hairline)}
.card-k{font:400 .6875rem/1 var(--font-mono);letter-spacing:.12em;text-transform:uppercase;color:var(--slate);padding:16px 18px 0}
.card-t{font-family:var(--font-display);font-size:1.5rem;line-height:1.15;padding:8px 18px 0}
.card-d{color:var(--slate);font-size:.9375rem;padding:8px 18px 18px}
.card-tool a{background:linear-gradient(160deg,var(--ground-soft),var(--ground));justify-content:flex-start}
.card-tool .card-k{color:var(--signal);padding-top:22px}
.card[hidden]{display:none}
.ds-empty{margin-top:22px;color:var(--slate)}
.linklike{background:none;border:0;color:var(--signal);text-decoration:underline;padding:0}

main.wrap{padding-block:28px 48px;display:flex;flex-direction:column;gap:18px}
@media (prefers-reduced-motion: reduce){.hero-fig img,.card a{transition:none}}

/* ---- intro ------------------------------------------------------ */
.eyebrow{font-family:var(--font-mono);font-size:.8125rem;text-transform:uppercase;letter-spacing:.18em;color:var(--slate);font-weight:500}
.intro h1{font-family:var(--font-display);font-weight:400;font-size:clamp(2.25rem,6vw,3.5rem);line-height:1.05;letter-spacing:.005em;margin-top:6px;text-wrap:balance}
.intro p#lede{color:var(--slate);margin-top:10px;max-width:68ch}

/* ---- tabs --------------------------------------------------------- */
.tabs{display:flex;gap:6px;flex-wrap:wrap}
.tabs button{font:500 .75rem/1 var(--font-mono);letter-spacing:.1em;text-transform:uppercase;color:var(--slate);background:transparent;border:1px solid var(--recessive);padding:10px 12px;border-radius:999px}
.tabs button:hover{color:var(--ink);border-color:var(--node)}
.tabs button[aria-selected="true"]{color:var(--ground-deep);background:var(--signal);border-color:var(--signal)}

/* ---- stage -------------------------------------------------------- */
.stage{position:relative;border:1px solid var(--hairline);border-radius:14px;overflow:hidden;background:radial-gradient(120% 90% at 50% 40%, var(--ground-soft) 0%, var(--ground-deep) 70%)}
#cv{display:block;width:100%;height:min(72vh,640px);min-height:380px;touch-action:none;cursor:grab}
.labels{position:absolute;inset:0;pointer-events:none}
.lab{position:absolute;transform:translate(-50%,-120%);font:400 11px/1.2 var(--font-mono);color:var(--slate);white-space:nowrap;text-shadow:0 0 4px var(--ground-deep),0 0 2px var(--ground-deep)}
.lab.big{font:600 12px/1.2 var(--font-body);color:var(--ink);letter-spacing:.03em}
.hud{position:absolute;left:12px;top:10px;right:12px;display:flex;justify-content:space-between;gap:8px 12px;pointer-events:none;flex-wrap:wrap}
.hud .when{font:500 clamp(22px,5vw,34px)/1 var(--font-mono);letter-spacing:-.02em;color:var(--ink)}
.hud .sub{font:400 11px/1.3 var(--font-mono);color:var(--slate);text-transform:uppercase;letter-spacing:.08em;margin-top:4px}
.legend{display:flex;flex-direction:column;align-items:flex-end;gap:4px;font:400 11px/1.2 var(--font-mono);color:var(--slate)}
.ramp{width:170px;height:8px;border-radius:4px}
.ramp-ticks{width:170px;display:flex;justify-content:space-between}
@media (max-width:620px){.hud{flex-direction:column}.legend{align-items:flex-start}.hud .when{font-size:20px}}
.tip{position:absolute;pointer-events:none;background:rgba(14,42,56,.96);border:1px solid var(--hairline);border-radius:8px;padding:8px 10px;font:400 12px/1.35 var(--font-mono);color:var(--ink);max-width:260px;transform:translate(12px,12px)}
.tip b{font-family:var(--font-body);font-weight:600}

/* ---- controls ----------------------------------------------------- */
.ctrl{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.ctrl button{font:600 .8125rem/1 var(--font-body);color:var(--ink);background:var(--ground);border:1px solid var(--recessive);border-radius:8px;padding:9px 12px;min-width:74px}
.ctrl button:hover{border-color:var(--node)}
.ctrl input[type=range]{flex:1;min-width:160px;accent-color:var(--signal)}
.ctrl .hint{font:400 12px/1.3 var(--font-mono);color:var(--slate)}

/* ---- readouts ----------------------------------------------------- */
.facts{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));background:var(--ground);border:1px solid var(--hairline);border-radius:12px;overflow:hidden}
.facts div{background:var(--ground);padding:12px 14px;min-width:0;box-shadow:0 0 0 .5px var(--hairline)}
.facts .k{font:400 11px/1.3 var(--font-mono);color:var(--slate);text-transform:uppercase;letter-spacing:.08em}
.facts .v{font:400 1.75rem/1.1 var(--font-display);margin-top:4px;font-variant-numeric:tabular-nums;color:var(--ink)}
.facts .n{font-size:13px;color:var(--slate);margin-top:2px}

details{border:1px solid var(--hairline);border-radius:12px;background:var(--ground)}
details summary{cursor:pointer;padding:12px 14px;font-weight:600}
.tbl{overflow-x:auto;max-height:420px;padding:0 6px 10px}
.tbl table{border-collapse:collapse;font:400 12px/1.3 var(--font-mono);font-variant-numeric:tabular-nums;width:100%}
.tbl th,.tbl td{padding:5px 8px;border-bottom:1px solid var(--hairline);text-align:right;white-space:nowrap}
.tbl th:first-child,.tbl td:first-child{text-align:left}
.tbl th{position:sticky;top:0;background:var(--ground);color:var(--slate);font-weight:400}

/* ---- notes -------------------------------------------------------- */
section.notes{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:18px;margin-top:8px}
section.notes h2{font-family:var(--font-mono);font-weight:500;font-size:.8125rem;letter-spacing:.18em;text-transform:uppercase;color:var(--slate);margin:0 0 8px}
section.notes p,section.notes li{color:var(--slate);font-size:.9375rem;max-width:65ch}
section.notes p + p{margin-top:.6em}
section.notes ul{padding-left:18px;margin:6px 0}
.qa{width:100%;border-collapse:collapse;font:400 12.5px/1.35 var(--font-mono)}
.qa td,.qa th{border-bottom:1px solid var(--hairline);padding:6px 8px;text-align:left;vertical-align:top}
.qa th{color:var(--slate);font-weight:400;text-transform:uppercase;letter-spacing:.06em;font-size:11px}
.pass{color:var(--pass)}.flag{color:var(--signal)}
.src{font-size:.8125rem;color:var(--slate)}
.src li{margin-bottom:4px}
section.notes li,section.notes p,.src{overflow-wrap:anywhere}

/* ---- footer ------------------------------------------------------- */
.site-foot{border-top:1px solid var(--hairline);background:var(--ground);padding-block:28px 40px}
.site-foot .wrap > * + *{margin-top:10px}
.closer{font-family:var(--font-display);font-style:normal;font-size:1.375rem;color:var(--ink)}
.closer::before{content:"";display:block;width:48px;height:2px;background:var(--signal);margin-bottom:14px}

@media (prefers-reduced-motion: reduce){*{transition:none!important}}

/* ---- 404 ------------------------------------------------------------- */
.notfound{padding-block:clamp(40px,8vw,96px)}
.notfound h1{font-family:var(--font-display);font-weight:400;font-size:clamp(2.25rem,6vw,3.5rem);line-height:1.05;margin-top:8px}
.notfound > p{color:var(--slate);margin-top:14px;max-width:60ch}
.nf-list{margin:18px 0 26px;padding-left:18px}
.nf-list li{margin-bottom:6px}