/* ============================================================
   DESIGN TOKENS  —  maps 1:1 to a Tailwind v4 @theme block.
   Brand: navy #002C73 · gold #FFD009 · white. Stated in OKLCH.
   ============================================================ */
:root{
  /* canvas + surfaces (deep navy ink scale) */
  --ink:        oklch(0.165 0.045 264);
  --navy-950:   oklch(0.205 0.060 264);
  --navy-900:   oklch(0.255 0.075 264);
  --navy-800:   oklch(0.310 0.095 264);
  --brand:      oklch(0.345 0.150 264);   /* #002C73 */
  --brand-lift: oklch(0.420 0.150 264);

  /* signal (gold) */
  --gold:       oklch(0.855 0.165 92);    /* #FFD009 */
  --gold-soft:  oklch(0.900 0.110 95);
  --gold-deep:  oklch(0.760 0.150 80);

  /* type */
  --paper:      oklch(0.970 0.012 250);
  --paper-dim:  oklch(0.880 0.018 255);
  --muted:      oklch(0.720 0.030 258);
  --faint:      oklch(0.560 0.035 260);

  /* lines / strokes */
  --line:       color-mix(in oklch, var(--paper) 12%, transparent);
  --line-soft:  color-mix(in oklch, var(--paper) 7%, transparent);
  --line-gold:  color-mix(in oklch, var(--gold) 34%, transparent);

  /* type families */
  --font-display: "Fraunces", Georgia, serif;
  --font-sans: "IBM Plex Sans", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;

  /* fluid scale */
  --step--1: clamp(0.80rem, 0.77rem + 0.15vw, 0.9rem);
  --step-0:  clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --step-1:  clamp(1.2rem, 1.1rem + 0.5vw, 1.5rem);
  --step-2:  clamp(1.6rem, 1.35rem + 1.2vw, 2.3rem);
  --step-3:  clamp(2.1rem, 1.6rem + 2.6vw, 3.6rem);
  --step-4:  clamp(2.9rem, 1.9rem + 4.8vw, 5.6rem);

  --radius: 14px;
  --radius-lg: 22px;
  --maxw: 1180px;
  --shadow: 0 1px 0 var(--line-soft), 0 26px 60px -32px oklch(0 0 0 / 0.85);
  --glow: 0 0 0 1px var(--line-gold), 0 0 44px -8px color-mix(in oklch, var(--gold) 55%, transparent);
}

/* ============================================================ RESET */
*,*::before,*::after{box-sizing:border-box;margin:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  font-family:var(--font-sans);
  font-size:var(--step-0);
  line-height:1.62;
  color:var(--paper-dim);
  background:var(--ink);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
::selection{background:var(--gold);color:oklch(0.18 0.08 264)}

/* ============================================================ ATMOSPHERE
   layered: brand gradient blooms + spectrum graticule grid + grain */
body::before{
  content:"";position:fixed;inset:0;z-index:-2;
  background:
    radial-gradient(900px 600px at 82% -8%, color-mix(in oklch, var(--brand) 60%, transparent), transparent 60%),
    radial-gradient(720px 520px at 6% 8%, color-mix(in oklch, var(--brand-lift) 32%, transparent), transparent 55%),
    radial-gradient(1100px 800px at 50% 118%, color-mix(in oklch, var(--brand) 40%, transparent), transparent 60%);
}
body::after{
  content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;
  background-image:
    linear-gradient(to right, var(--line-soft) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line-soft) 1px, transparent 1px);
  background-size:48px 48px;
  -webkit-mask-image:radial-gradient(circle at 50% 30%, black, transparent 78%);
          mask-image:radial-gradient(circle at 50% 30%, black, transparent 78%);
  opacity:.5;
}
.grain{position:fixed;inset:0;z-index:-1;pointer-events:none;opacity:.05;mix-blend-mode:overlay;}

/* ============================================================ LAYOUT */
.wrap{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:clamp(1.1rem,4vw,2.5rem)}
section{position:relative}
.eyebrow{
  font-family:var(--font-mono);font-size:var(--step--1);font-weight:500;
  letter-spacing:.18em;text-transform:uppercase;color:var(--gold);
  display:inline-flex;align-items:center;gap:.6rem;
}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--line-gold)}

/* ============================================================ SKIP LINK */
.skip{position:absolute;left:-999px;top:.5rem;z-index:100;background:var(--gold);color:#001;
  padding:.5rem .9rem;border-radius:8px;font-weight:600}
.skip:focus{left:.8rem}

/* ============================================================ HEADER / NAV */
header{position:sticky;top:0;z-index:50;
  backdrop-filter:blur(12px) saturate(140%);
  background:color-mix(in oklch, var(--ink) 72%, transparent);
  border-bottom:1px solid var(--line-soft);
}
.nav{position:relative;display:flex;align-items:center;justify-content:space-between;gap:1.5rem;min-height:78px}
.brand{display:flex;align-items:center;gap:.7rem;font-family:var(--font-display);font-weight:600;font-size:1.35rem;letter-spacing:-.01em;color:var(--paper);flex-shrink:0}
.brand .mark{width:30px;height:30px;flex:0 0 auto}
.brand b{color:var(--gold);font-weight:600}
.nav-panel{display:flex;align-items:center;gap:.45rem}
.nav-link,.tool-switcher summary{display:flex;align-items:center;justify-content:space-between;gap:.6rem;min-height:44px;padding:.6rem .85rem;border-radius:10px;font-size:.9rem;font-weight:500;color:var(--paper-dim);transition:background .15s,color .15s}
.nav-link:hover,.tool-switcher summary:hover{background:var(--line-soft);color:var(--paper)}
.nav-link[aria-current="page"],.tool-switcher.is-active summary{color:var(--gold);background:color-mix(in oklch,var(--gold) 8%,transparent)}
.nav-cite{border:1px solid var(--line);margin-left:.35rem}
.nav-api-icon{font-size:.85rem;color:var(--muted)}
.tool-switcher{position:relative}
.tool-switcher summary{cursor:pointer;list-style:none;user-select:none}
.tool-switcher summary::-webkit-details-marker{display:none}
.nav-chevron{transition:transform .15s;flex-shrink:0}
.tool-switcher[open] .nav-chevron{transform:rotate(180deg)}
.tool-switcher[open] summary{background:var(--line-soft)}
.tool-menu{position:absolute;top:calc(100% + 12px);left:0;width:350px;padding:1rem;background:var(--navy-950);border:1px solid var(--line);border-radius:18px;box-shadow:0 18px 60px oklch(0 0 0 / .4)}
.tool-menu-heading{font-family:var(--font-mono);font-size:.67rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);padding:.15rem .5rem .8rem}
.tool-list{list-style:none;padding:0;display:grid;gap:.25rem}
.tool-list a{display:flex;align-items:center;gap:.8rem;min-height:68px;padding:.7rem .5rem;border-radius:10px}
.tool-list a:hover{background:var(--line-soft)}
.tool-list a[aria-current="page"]{background:color-mix(in oklch,var(--gold) 8%,transparent)}
.tool-symbol{display:grid;place-items:center;width:32px;height:32px;border:1px solid var(--line);border-radius:9px;color:var(--gold);font: .7rem var(--font-mono);flex-shrink:0}
.tool-list strong{display:block;font-size:.95rem;font-weight:500;color:var(--paper)}
.tool-list small{display:block;font-size:.75rem;color:var(--muted);line-height:1.6}
.tool-arrow{margin-left:auto;color:var(--gold);font-size:.85rem}
.all-calculators{display:flex;align-items:center;justify-content:space-between;min-height:44px;margin-top:.7rem;padding:.65rem .5rem 0;border-top:1px solid var(--line);font-size:.8rem;color:var(--muted)}
.all-calculators:hover{color:var(--paper)}
.nav-toggle{align-items:center;gap:.65rem;min-height:44px;padding:.5rem .8rem;border:1px solid var(--line);border-radius:10px;background:transparent;color:var(--paper);font:500 .85rem var(--font-sans);cursor:pointer}
.nav-toggle[hidden]{display:none}
.nav-toggle:not([hidden]){display:none}
:where(a,button,summary,input,select):focus-visible{outline:2px solid var(--gold);outline-offset:4px}
#main-content:focus{outline:none}
#calculators{scroll-margin-top:100px}

/* ============================================================ HERO */
.hero{padding-block:clamp(3rem,7vw,6rem) clamp(2.5rem,5vw,4.5rem)}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(2rem,5vw,4.5rem);align-items:center}
.hero h1{
  font-family:var(--font-display);font-optical-sizing:auto;
  font-weight:400;font-size:var(--step-4);line-height:.98;letter-spacing:-.025em;
  color:var(--paper);margin:1.3rem 0 0;
}
.hero h1 em{font-style:italic;font-weight:500;color:var(--gold)}
.hero h1 .frac{font-feature-settings:"ss01";}
.lede{margin-top:1.5rem;max-width:34ch;font-size:var(--step-1);color:var(--paper-dim);line-height:1.5}
.lede strong{color:var(--paper);font-weight:500}
.cta-row{display:flex;flex-wrap:wrap;gap:.9rem;margin-top:2.2rem}
.btn{display:inline-flex;align-items:center;gap:.6rem;font-weight:500;font-size:1rem;
  padding:.85rem 1.4rem;border-radius:12px;border:1px solid transparent;transition:.22s ease}
.btn-primary{background:var(--gold);color:oklch(0.2 0.08 264);box-shadow:0 14px 34px -16px color-mix(in oklch,var(--gold) 80%,transparent)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 20px 44px -16px color-mix(in oklch,var(--gold) 85%,transparent)}
.btn-ghost{border-color:var(--line);color:var(--paper);background:color-mix(in oklch,var(--paper) 4%,transparent)}
.btn-ghost:hover{border-color:var(--line-gold);color:var(--gold);transform:translateY(-2px)}
.btn .arr{transition:transform .22s ease}
.btn:hover .arr{transform:translateX(3px)}

/* hero instrument panel */
.scope{
  position:relative;border:1px solid var(--line);border-radius:var(--radius-lg);
  background:linear-gradient(180deg, var(--navy-900), var(--navy-950));
  padding:1.1rem 1.1rem 1rem;box-shadow:var(--shadow);
  overflow:hidden;
}
.scope::before{content:"";position:absolute;inset:0;background:
  radial-gradient(420px 200px at 70% 0%, color-mix(in oklch,var(--gold) 14%,transparent), transparent 70%);}
.scope-head{display:flex;align-items:center;justify-content:space-between;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.06em;color:var(--muted);margin-bottom:.4rem}
.scope-head .dot{width:7px;height:7px;border-radius:50%;background:var(--gold);box-shadow:0 0 10px var(--gold);display:inline-block;margin-right:.45rem;animation:pulse 2.6s ease-in-out infinite}
@keyframes pulse{50%{opacity:.35}}
.scope-tag{color:var(--gold)}
.readout{display:flex;gap:1.4rem;font-family:var(--font-mono);margin-top:.7rem;flex-wrap:wrap}
.readout .k{font-size:.66rem;letter-spacing:.12em;text-transform:uppercase;color:var(--faint)}
.readout .v{font-size:1.05rem;color:var(--paper);font-weight:500}
.readout .v small{color:var(--gold);font-size:.7rem;margin-left:.25rem}

/* ============================================================ MARQUEE STAT STRIP */
.metrics{border-block:1px solid var(--line-soft);margin-top:1rem}
.metrics .wrap{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line-soft);
  border-inline:1px solid var(--line-soft)}
.metric{background:var(--ink);padding:1.4rem clamp(1rem,2vw,1.6rem)}
.metric .n{font-family:var(--font-mono);font-size:1.05rem;color:var(--gold);font-weight:500}
.metric .l{font-size:.86rem;color:var(--muted);margin-top:.25rem}

/* ============================================================ SECTION HEADING */
.shead{max-width:60ch;margin-bottom:clamp(1.8rem,3vw,2.8rem)}
.shead h2{font-family:var(--font-display);font-weight:400;font-size:var(--step-3);
  line-height:1.02;letter-spacing:-.02em;color:var(--paper);margin-top:.9rem}
.shead p{margin-top:1rem;color:var(--muted);font-size:var(--step-1);max-width:52ch}
.block{padding-block:clamp(3.5rem,7vw,6rem)}

/* ============================================================ CALCULATOR CARDS */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:1.2rem}
.card{
  position:relative;display:flex;flex-direction:column;gap:1rem;
  padding:1.6rem 1.5rem 1.5rem;border:1px solid var(--line);border-radius:var(--radius-lg);
  background:linear-gradient(180deg,color-mix(in oklch,var(--navy-900) 60%,transparent),color-mix(in oklch,var(--navy-950) 40%,transparent));
  transition:transform .3s cubic-bezier(.2,.7,.2,1), border-color .3s, box-shadow .3s;
  overflow:hidden;min-height:230px;
}
.card::after{content:"";position:absolute;inset:auto -40% -60% auto;width:220px;height:220px;border-radius:50%;
  background:radial-gradient(circle,color-mix(in oklch,var(--gold) 20%,transparent),transparent 70%);opacity:0;transition:opacity .35s}
.card:hover{transform:translateY(-6px);border-color:var(--line-gold);box-shadow:var(--glow)}
.card:hover::after{opacity:1}
.card .idx{font-family:var(--font-mono);font-size:.72rem;color:var(--faint);letter-spacing:.1em}
.card h3{font-family:var(--font-display);font-weight:500;font-size:1.5rem;color:var(--paper);letter-spacing:-.01em}
.card p{font-size:.94rem;color:var(--muted);flex:1}
.card .go{font-family:var(--font-mono);font-size:.84rem;color:var(--gold);display:inline-flex;align-items:center;gap:.45rem}
.glyphs{display:flex;gap:.5rem;align-items:center;height:30px}

/* SNFG-style monosaccharide glyphs (stylized, brand-tinted) */
.snfg{width:18px;height:18px;display:inline-block}
.snfg.circle{border-radius:50%;background:var(--gold)}
.snfg.square{background:var(--paper)}
.snfg.tri{width:0;height:0;background:none;border-left:9px solid transparent;border-right:9px solid transparent;border-bottom:16px solid var(--gold-deep)}
.snfg.diamond{background:var(--paper-dim);transform:rotate(45deg);width:14px;height:14px}

/* ============================================================ FEATURE SPLIT (identifier) */
.split{display:grid;grid-template-columns:1fr 1fr;gap:clamp(2rem,4vw,3.5rem);align-items:center}
.feature-list{list-style:none;display:grid;gap:1.1rem;margin-top:1.6rem}
.feature-list li{display:flex;gap:.9rem;align-items:flex-start;font-size:.98rem;color:var(--paper-dim)}
.feature-list .tick{flex:0 0 auto;width:22px;height:22px;border-radius:7px;display:grid;place-items:center;
  background:color-mix(in oklch,var(--gold) 18%,transparent);color:var(--gold);font-family:var(--font-mono);font-size:.8rem;margin-top:.15rem}
.panel{border:1px solid var(--line);border-radius:var(--radius-lg);background:var(--navy-950);
  box-shadow:var(--shadow);overflow:hidden}
.panel-bar{display:flex;align-items:center;gap:.5rem;padding:.7rem 1rem;border-bottom:1px solid var(--line-soft);
  font-family:var(--font-mono);font-size:.74rem;color:var(--muted)}
.tl{width:11px;height:11px;border-radius:50%;background:var(--line)}
.upload{padding:1.6rem;display:grid;gap:1rem}
.dropzone{border:1.5px dashed var(--line-gold);border-radius:14px;padding:1.6rem;text-align:center;
  font-family:var(--font-mono);font-size:.84rem;color:var(--muted);background:color-mix(in oklch,var(--gold) 5%,transparent)}
.dropzone b{color:var(--gold);display:block;font-size:1rem;margin-bottom:.3rem}
.job{display:flex;align-items:center;gap:.8rem;font-family:var(--font-mono);font-size:.8rem;color:var(--paper-dim);
  border:1px solid var(--line-soft);border-radius:10px;padding:.7rem .9rem}
.bar{flex:1;height:6px;border-radius:99px;background:var(--navy-800);overflow:hidden}
.bar i{display:block;height:100%;width:68%;background:linear-gradient(90deg,var(--gold-deep),var(--gold));border-radius:99px;
  animation:load 2.8s ease-in-out infinite}
@keyframes load{0%{width:18%}50%{width:82%}100%{width:18%}}
.badge{padding:.15rem .5rem;border-radius:6px;font-size:.7rem;background:color-mix(in oklch,var(--gold) 20%,transparent);color:var(--gold)}

/* ============================================================ API */
.code{font-family:var(--font-mono);font-size:.84rem;line-height:1.7;color:var(--paper-dim);
  background:var(--navy-950);border:1px solid var(--line);border-radius:var(--radius);
  padding:1.2rem 1.3rem;overflow:auto;box-shadow:var(--shadow)}
.code .c{color:var(--faint)}
.code .m{color:var(--gold)}
.code .s{color:var(--gold-soft)}
.code .key{color:var(--paper)}

/* ============================================================ ABOUT / FOOTER */
.about{display:flex;gap:1.2rem;flex-wrap:wrap;margin-top:1.6rem}
.person{display:flex;align-items:center;gap:.8rem;border:1px solid var(--line-soft);border-radius:99px;padding:.5rem .9rem .5rem .5rem}
.avatar{width:38px;height:38px;border-radius:50%;background:linear-gradient(135deg,var(--brand-lift),var(--brand));
  display:grid;place-items:center;font-family:var(--font-display);color:var(--gold);font-weight:600}
.person .nm{font-weight:500;color:var(--paper);font-size:.92rem}
.person .ro{font-size:.78rem;color:var(--muted)}

footer{border-top:1px solid var(--line-soft);margin-top:clamp(3rem,6vw,5rem);padding-block:2.6rem}
.foot{display:flex;justify-content:space-between;align-items:flex-start;gap:2rem;flex-wrap:wrap}
.foot-links{display:flex;gap:2.4rem;flex-wrap:wrap}
.foot-col h4{font-family:var(--font-mono);font-size:.7rem;letter-spacing:.14em;text-transform:uppercase;color:var(--faint);margin-bottom:.8rem}
.foot-col a{display:block;color:var(--muted);font-size:.9rem;padding:.18rem 0;transition:color .2s}
.foot-col a:hover{color:var(--gold)}
.foot-brand{max-width:30ch}
.foot-brand p{color:var(--faint);font-size:.84rem;margin-top:.6rem}
.legal{margin-top:2rem;padding-top:1.4rem;border-top:1px solid var(--line-soft);
  display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;font-size:.8rem;color:var(--faint);font-family:var(--font-mono)}

/* ============================================================ MOTION: staggered load reveal */
@keyframes rise{from{opacity:0;transform:translateY(18px)}to{opacity:1;transform:none}}
.reveal{opacity:0;animation:rise .8s cubic-bezier(.2,.7,.2,1) forwards}
.d1{animation-delay:.05s}.d2{animation-delay:.15s}.d3{animation-delay:.25s}
.d4{animation-delay:.35s}.d5{animation-delay:.45s}.d6{animation-delay:.55s}

/* spectrum draw animations */
.peak{transform-origin:bottom;transform:scaleY(0);animation:grow .9s cubic-bezier(.2,.8,.2,1) forwards}
@keyframes grow{to{transform:scaleY(1)}}
.profile{stroke-dasharray:1400;stroke-dashoffset:1400;animation:draw 2.2s ease forwards .5s}
@keyframes draw{to{stroke-dashoffset:0}}
.sweep{animation:sweep 3.4s linear infinite}
@keyframes sweep{0%{transform:translateX(-10px);opacity:0}10%{opacity:.7}90%{opacity:.7}100%{transform:translateX(560px);opacity:0}}

/* ============================================================ RESPONSIVE */
@media (max-width:920px){
  .hero-grid{grid-template-columns:1fr;gap:2.5rem}
  .split{grid-template-columns:1fr}
  .cards{grid-template-columns:1fr}
  .metrics .wrap{grid-template-columns:repeat(2,1fr)}
  .nav{flex-wrap:wrap;gap:0;padding-block:1rem}
  .nav-panel{width:100%;flex-direction:column;align-items:stretch;gap:.25rem;padding-top:1rem;max-height:calc(100dvh - 78px);overflow-y:auto}
  .nav-link,.tool-switcher summary{min-height:48px;padding:.8rem}
  .nav-cite{margin:.5rem 0 0}
  .tool-menu{position:static;width:100%;margin:.35rem 0 .75rem;box-shadow:none;background:color-mix(in oklch,var(--navy-900) 50%,transparent)}
  .nav-ready .nav-toggle:not([hidden]){display:flex}
  .nav-ready .nav-panel{position:absolute;top:100%;left:calc(-1 * clamp(1.1rem,4vw,2.5rem));right:calc(-1 * clamp(1.1rem,4vw,2.5rem));width:auto;padding:1rem clamp(1.1rem,4vw,2.5rem) 1.25rem;background:var(--ink);border-bottom:1px solid var(--line);max-height:calc(100dvh - 78px);overflow-y:auto;overscroll-behavior:contain;box-shadow:0 18px 30px oklch(0 0 0 / .25)}
  .nav-ready .nav-panel:not(.is-open){display:none}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none !important;transition:none !important;scroll-behavior:auto}
  .reveal{opacity:1}.peak{transform:none}.profile{stroke-dashoffset:0}
}

/* ---- calculator form + result (Phase 2) ---- */
.calc-shell{display:grid;grid-template-columns:minmax(280px,360px) 1fr;gap:clamp(1.5rem,4vw,3rem);align-items:start}
@media (max-width:820px){.calc-shell{grid-template-columns:1fr}}
.calc-form{display:grid;gap:1rem;border:1px solid var(--line);border-radius:var(--radius-lg);padding:1.5rem;background:var(--navy-950)}
.calc-form label{display:block;font-family:var(--font-sans);font-size:.82rem;color:var(--muted);margin-bottom:.35rem;overflow-wrap:anywhere}
.calc-form input,.calc-form select{width:100%;background:var(--ink);border:1px solid var(--line);border-radius:10px;color:var(--paper);padding:.6rem .7rem;font-family:var(--font-mono);font-size:.95rem}
.calc-form input:focus,.calc-form select:focus{outline:none;border-color:var(--line-gold);box-shadow:0 0 0 3px color-mix(in oklch,var(--gold) 18%,transparent)}
.calc-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,160px),1fr));gap:.8rem}
.calc-grid>div{display:grid;grid-template-rows:1fr auto;min-width:0}
.result-panel{border:1px solid var(--line);border-radius:var(--radius-lg);background:var(--navy-950);padding:1.4rem;min-height:320px}
.result-readout{display:flex;gap:1.6rem;flex-wrap:wrap;font-family:var(--font-mono);margin-bottom:1rem}
.result-readout .k{font-size:.66rem;letter-spacing:.12em;text-transform:uppercase;color:var(--faint)}
.result-readout .v{font-size:1.15rem;color:var(--paper)}
.result-readout .v small{color:var(--gold);font-size:.7rem;margin-left:.25rem}
.spectrum{width:100%;height:240px}
.error-note{border:1px solid var(--line-gold);border-radius:12px;padding:1rem;color:var(--gold-soft);font-size:.95rem;background:color-mix(in oklch,var(--gold) 6%,transparent)}
.u-legend{color:var(--muted)!important}

.permalink{display:flex;gap:.9rem;align-items:center;margin-top:1.1rem;font:500 .72rem/1 var(--font-mono);letter-spacing:.1em;text-transform:uppercase}
.permalink a{color:var(--gold);text-decoration:none;border-bottom:1px solid var(--line-gold);padding-bottom:2px}
.permalink a:hover{color:var(--gold-soft)}
.permalink-copy{background:none;border:1px solid var(--line);border-radius:6px;color:var(--muted);font:inherit;padding:.32rem .6rem;cursor:pointer;transition:color .18s ease,border-color .18s ease}
.permalink-copy:hover{border-color:var(--line-gold);color:var(--gold)}

/* Keep isotope plots within their grid cell as the viewport changes. */
.result-panel,.spectrum{min-width:0}
.spectrum{width:100%}
.spectrum-caption{font-size:.8rem;color:var(--muted);margin:1.1rem 0 .5rem}

.spectrum-header{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:.5rem;margin-top:1rem}
.spectrum-header .spectrum-caption{margin:0}
.spectrum-modes{display:flex;gap:.2rem;padding:.2rem;border:1px solid var(--line);border-radius:10px}
.spectrum-modes button{min-height:36px;padding:.4rem .75rem;border:0;border-radius:7px;background:transparent;color:var(--muted);font:500 .75rem var(--font-sans);cursor:pointer}
.spectrum-modes button[aria-pressed="true"]{background:var(--line-soft);color:var(--gold)}

.calculate-busy{display:none}
.calc-form[aria-busy="true"] .calculate-idle{display:none}
.calc-form[aria-busy="true"] .calculate-busy{display:inline}
.calc-form button:disabled{cursor:wait;opacity:.75}
.calculation-status{min-height:1.4em;margin:.5rem 0 0;color:var(--muted);font-size:.8rem}