/* ============================================================
   CODEX — U.S. Electrical Construction Codes
   Design system: paper + copper, Space Grotesk / IBM Plex
   ============================================================ */
:root{
  --paper:#DCDBD8; --paper-2:#E7E6E2; --card:#F3F2EF; --ink:#242424; --ink-soft:#4a4a48;
  --dim:#8a8a86; --line:#c7c6c1; --line-2:#d6d5d0;
  --copper:#C0512F; --copper-soft:#d98a6a; --copper-ink:#8f3c22;
  --blue:#1E7Fc0; --arc:#1E9BFF; --amber:#C98A18; --green:#3F8F5B; --red:#C0392B;
  --shadow:0 1px 2px rgba(0,0,0,.05),0 8px 24px rgba(30,25,20,.06);
  --shadow-lg:0 12px 40px rgba(30,25,20,.14);
  --font-display:"Space Grotesk",system-ui,sans-serif;
  --font-body:"IBM Plex Sans",system-ui,sans-serif;
  --font-mono:"IBM Plex Mono",ui-monospace,monospace;
  --topbar-h:60px; --sidebar-w:204px; --maxw:1480px; --r:4px;
}
:root[data-theme="dark"]{
  --paper:#14171C; --paper-2:#1b1f26; --card:#1e232b; --ink:#E7ECF2; --ink-soft:#b9c1cb;
  --dim:#7f8b99; --line:#2a313b; --line-2:#333c47;
  --copper:#D77B4F; --copper-soft:#e59a72; --copper-ink:#e08a5c;
  --blue:#5AA6E6; --arc:#5CC0FF; --amber:#E0A83D; --green:#5CB77E; --red:#E06356;
  --shadow:0 1px 2px rgba(0,0,0,.3),0 10px 30px rgba(0,0,0,.35);
  --shadow-lg:0 16px 48px rgba(0,0,0,.5);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--font-body);background:var(--paper);color:var(--ink);
  line-height:1.55;-webkit-font-smoothing:antialiased;
}
a{color:inherit}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:600;line-height:1.1;letter-spacing:-.01em}
img,svg{max-width:100%}
::selection{background:var(--copper);color:#fff}
.skip-link{position:absolute;left:-999px;top:0;z-index:200;background:var(--ink);color:var(--paper);padding:10px 16px}
.skip-link:focus{left:8px;top:8px}
:focus-visible{outline:2px solid var(--copper);outline-offset:2px;border-radius:2px}

/* ---------- top bar ---------- */
.topbar{position:sticky;top:0;z-index:100;height:var(--topbar-h);
  background:color-mix(in srgb,var(--paper) 88%,transparent);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line)}
.topbar__inner{height:100%;display:flex;align-items:center;gap:14px;padding:0 18px;max-width:1860px;margin:0 auto}
.brand{display:flex;align-items:center;gap:9px;text-decoration:none;flex-shrink:0}
.brand__word{font-family:var(--font-display);font-weight:700;font-size:19px;letter-spacing:.04em;color:var(--ink)}
.brand__sub{font-family:var(--font-mono);font-weight:400;font-size:9.5px;letter-spacing:.14em;color:var(--dim);
  display:block;margin-top:-2px}
.search{position:relative;flex:1;max-width:440px;margin:0 auto}
.search__icon{position:absolute;left:12px;top:50%;transform:translateY(-50%);color:var(--dim)}
.search__input{width:100%;height:38px;padding:0 40px 0 38px;border:1px solid var(--line);border-radius:var(--r);
  background:var(--card);color:var(--ink);font-family:var(--font-body);font-size:14px}
.search__input::placeholder{color:var(--dim)}
.search__kbd{position:absolute;right:10px;top:50%;transform:translateY(-50%);font-family:var(--font-mono);
  font-size:11px;color:var(--dim);border:1px solid var(--line);border-radius:3px;padding:1px 6px;background:var(--paper)}
.search__results{position:absolute;top:44px;left:0;right:0;background:var(--card);border:1px solid var(--line);
  border-radius:var(--r);box-shadow:var(--shadow-lg);max-height:60vh;overflow-y:auto;z-index:120}
.sr__item{display:block;padding:10px 14px;text-decoration:none;border-bottom:1px solid var(--line-2)}
.sr__item:last-child{border-bottom:0}
.sr__item:hover,.sr__item.active{background:var(--paper-2)}
.sr__t{font-weight:600;font-size:14px}
.sr__m{font-family:var(--font-mono);font-size:11px;color:var(--copper)}
.sr__cat{font-size:11px;color:var(--dim)}
.sr__empty{padding:16px;color:var(--dim);font-size:13px;text-align:center}
.topnav{display:flex;gap:4px;flex-shrink:0}
.topnav a{font-size:13.5px;font-weight:500;color:var(--ink-soft);text-decoration:none;padding:7px 11px;border-radius:var(--r)}
.topnav a:hover,.topnav a.active{background:var(--paper-2);color:var(--ink)}
.iconbtn{position:relative;display:inline-flex;align-items:center;justify-content:center;width:38px;height:38px;
  border:1px solid var(--line);border-radius:var(--r);background:var(--card);color:var(--ink-soft);cursor:pointer}
.iconbtn:hover{color:var(--ink);border-color:var(--copper)}
.iconbtn__badge{position:absolute;top:-6px;right:-6px;background:var(--copper);color:#fff;font-size:10px;
  font-weight:700;min-width:17px;height:17px;border-radius:9px;display:flex;align-items:center;justify-content:center;padding:0 4px}
.lang-toggle{display:flex;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;font-family:var(--font-mono);font-size:12px}
.lang-toggle button{padding:8px 10px;border:0;background:var(--card);color:var(--dim);cursor:pointer;font-family:inherit}
.lang-toggle button.on{background:var(--copper);color:#fff}
.icon-moon{display:none}
:root[data-theme="dark"] .icon-sun{display:none}
:root[data-theme="dark"] .icon-moon{display:block}
.topbar__menu{display:none}

/* ---------- layout ---------- */
.layout{display:flex;max-width:1860px;margin:0 auto}
.sidebar{width:var(--sidebar-w);flex-shrink:0;border-right:1px solid var(--line);
  height:calc(100vh - var(--topbar-h));position:sticky;top:var(--topbar-h);overflow-y:auto}
.sidebar__scroll{padding:18px 8px 40px}
.sb__group{margin-bottom:22px}
.sb__title{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.18em;text-transform:uppercase;
  color:var(--dim);padding:0 12px 8px}
.sb__link{display:flex;align-items:center;gap:8px;padding:7px 10px;border-radius:var(--r);text-decoration:none;
  color:var(--ink-soft);font-size:13.5px;border-left:2px solid transparent}
.sb__link:hover{background:var(--paper-2);color:var(--ink)}
.sb__link.active{background:var(--paper-2);color:var(--ink);border-left-color:var(--copper);font-weight:600}
.sb__ch{font-family:var(--font-mono);font-size:11px;color:var(--copper);width:20px;flex-shrink:0}
.sb__ico{width:17px;height:17px;flex-shrink:0;color:var(--dim)}
.sidebar__scrim{display:none}
.main{flex:1;min-width:0}
.wrap{max-width:var(--maxw);margin:0 auto;padding:36px 28px 60px}

/* ---------- hero ---------- */
.hero{position:relative;height:calc(100vh - var(--topbar-h));min-height:600px;overflow:hidden;border-bottom:1px solid var(--line)}
.hero__arc{position:absolute;inset:0;z-index:1}
.hero__arc svg{position:absolute;inset:0;width:100%;height:100%}
.fil{stroke-dasharray:1;stroke-dashoffset:1;animation:draw 1.1s ease forwards;animation-delay:var(--d)}
.lead{stroke-dasharray:1;stroke-dashoffset:1;animation:draw 1.4s ease forwards;animation-delay:.15s}
@keyframes draw{to{stroke-dashoffset:0}}
.hero__content{position:relative;z-index:3;height:100%;max-width:var(--maxw);margin:0 auto;padding:0 28px}
.hero__eyebrow{position:absolute;left:28px;top:50%;transform:translateY(-160px);font-family:var(--font-mono);
  font-size:12px;letter-spacing:.32em;text-transform:uppercase;color:var(--copper);font-weight:500}
.hero__h{position:absolute;left:28px;top:50%;transform:translateY(-110px);font-family:var(--font-display);
  font-weight:600;font-size:clamp(48px,8vw,120px);line-height:.9;letter-spacing:-.02em}
.hero__h .thin{color:var(--ink-soft);font-weight:500}
.hero__h .dot{color:var(--copper)}
.hero__lede{position:absolute;left:28px;bottom:44px;max-width:300px;font-size:15px;color:var(--ink-soft)}
.hero__tag{margin-top:14px;font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--copper)}
.footer__tag{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.12em;text-transform:uppercase;
  color:var(--copper);margin-top:6px}
.hero__cta{display:inline-block;margin-top:14px;font-weight:600;font-size:14px;text-decoration:none;
  border-bottom:1px solid var(--copper);padding-bottom:2px}
.hero__cta:hover{color:var(--copper)}
.hero__stats{position:absolute;right:28px;top:50%;transform:translateY(-50%);display:flex;flex-direction:column;
  gap:26px;text-align:right}
.hs__k{font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--dim)}
.hs__v{font-family:var(--font-display);font-weight:600;font-size:22px;margin-top:4px}
.hs__v .arrow{color:var(--copper)}

/* ---------- generic sections ---------- */
.page-head{margin-bottom:28px}
.page-eyebrow{font-family:var(--font-mono);font-size:11px;letter-spacing:.24em;text-transform:uppercase;color:var(--copper);font-weight:500}
.page-title{font-size:clamp(30px,4vw,46px);margin:8px 0 10px}
.page-sub{color:var(--ink-soft);max-width:70ch;font-size:16px}
.breadcrumb{font-family:var(--font-mono);font-size:12px;color:var(--dim);margin-bottom:14px}
.breadcrumb a{text-decoration:none;color:var(--dim)}.breadcrumb a:hover{color:var(--copper)}

/* filter bar */
.filters{display:flex;flex-wrap:wrap;gap:8px;margin:20px 0 26px;align-items:center}
.chip{font-family:var(--font-mono);font-size:12px;padding:6px 12px;border:1px solid var(--line);border-radius:20px;
  background:var(--card);color:var(--ink-soft);cursor:pointer}
.chip:hover{border-color:var(--copper)}
.chip.on{background:var(--copper);color:#fff;border-color:var(--copper)}

/* ---------- code cards ---------- */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px}
.card{position:relative;background:var(--card);border:1px solid var(--line);border-radius:var(--r);
  border-left:3px solid var(--cat,var(--copper));padding:18px 18px 18px 20px;box-shadow:var(--shadow);
  text-decoration:none;color:inherit;display:block;transition:transform .15s,box-shadow .15s,border-color .15s}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg)}
.card__top{display:flex;justify-content:space-between;align-items:flex-start;gap:10px;margin-bottom:8px}
.card__num{font-family:var(--font-mono);font-size:12px;color:var(--copper);font-weight:500}
.card__year{font-family:var(--font-mono);font-size:12px;color:var(--dim)}
.card__title{font-size:17px;margin-bottom:6px;line-height:1.2}
.card__sum{font-size:13.5px;color:var(--ink-soft);display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.card__meta{display:flex;gap:8px;margin-top:12px;flex-wrap:wrap}
.tag{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.04em;text-transform:uppercase;
  padding:3px 8px;border-radius:3px;background:var(--paper-2);color:var(--ink-soft)}
.tag--reason{background:color-mix(in srgb,var(--amber) 22%,transparent);color:var(--copper-ink)}
.tag--nat{background:color-mix(in srgb,var(--blue) 18%,transparent);color:var(--blue)}
.bookmark{position:absolute;top:14px;right:14px;background:none;border:0;cursor:pointer;color:var(--dim);padding:4px}
.bookmark:hover,.bookmark.on{color:var(--copper)}

/* reason categories */
.cat-fire{--cat:var(--red)} .cat-tech{--cat:var(--blue)} .cat-std{--cat:var(--copper)}
.cat-shock{--cat:var(--amber)} .cat-safety{--cat:var(--green)}

/* ---------- code detail ---------- */
.detail{max-width:820px}
.detail__hero{border:1px solid var(--line);border-left:4px solid var(--cat,var(--copper));border-radius:var(--r);
  background:var(--card);padding:26px;margin-bottom:24px}
.detail__num{font-family:var(--font-mono);color:var(--copper);font-size:15px;font-weight:500}
.detail__title{font-size:clamp(26px,3.5vw,38px);margin:6px 0 14px}
.detail__facts{display:flex;flex-wrap:wrap;gap:22px;margin-top:14px}
.fact{}.fact__k{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--dim)}
.fact__v{font-weight:600;margin-top:2px}
.reasonbox{background:color-mix(in srgb,var(--amber) 14%,transparent);border:1px solid color-mix(in srgb,var(--amber) 40%,transparent);
  border-radius:var(--r);padding:16px 18px;margin:22px 0;display:flex;gap:14px}
.reasonbox svg{flex-shrink:0;color:var(--copper)}
.reasonbox h4{font-size:13px;text-transform:uppercase;letter-spacing:.06em;color:var(--copper-ink);margin-bottom:4px}
.prose{font-size:16px;color:var(--ink)}
.prose h3{font-size:20px;margin:26px 0 10px}
.prose p{margin:10px 0}
.gloss{border-bottom:1px dotted var(--copper);cursor:help;position:relative}
.timeline-inline{border-left:2px solid var(--line);margin:16px 0;padding-left:0;list-style:none}
.timeline-inline li{position:relative;padding:0 0 16px 22px}
.timeline-inline li::before{content:"";position:absolute;left:-6px;top:5px;width:10px;height:10px;border-radius:50%;
  background:var(--copper);border:2px solid var(--paper)}
.timeline-inline .ty{font-family:var(--font-mono);color:var(--copper);font-weight:500;font-size:13px}
.accordion{border:1px solid var(--line);border-radius:var(--r);margin:16px 0;overflow:hidden}
.accordion summary{padding:14px 18px;cursor:pointer;font-weight:600;background:var(--card);list-style:none;display:flex;justify-content:space-between;align-items:center}
.accordion summary::-webkit-details-marker{display:none}
.accordion[open] summary{border-bottom:1px solid var(--line)}
.accordion__body{padding:16px 18px}
.related{display:flex;flex-wrap:wrap;gap:8px;margin-top:8px}
.related a{font-family:var(--font-mono);font-size:12px;padding:6px 10px;border:1px solid var(--line);border-radius:var(--r);text-decoration:none;color:var(--copper)}
.related a:hover{border-color:var(--copper)}
.gt-btn{font-family:var(--font-mono);font-size:11px;color:var(--dim);background:none;border:1px solid var(--line);
  border-radius:3px;padding:4px 9px;cursor:pointer;margin-left:8px}
.gt-btn:hover{border-color:var(--copper);color:var(--copper)}

/* ---------- helper hub / calculators ---------- */
.tool-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px}
.tool-card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:20px;text-decoration:none;
  color:inherit;box-shadow:var(--shadow);transition:transform .15s,box-shadow .15s}
.tool-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg)}
.tool-card__ic{width:38px;height:38px;color:var(--copper);margin-bottom:12px}
.tool-card h3{font-size:17px;margin-bottom:6px}
.tool-card p{font-size:13.5px;color:var(--ink-soft)}
.calc{display:grid;grid-template-columns:1fr 1fr;gap:26px;align-items:start}
.calc__form,.calc__out{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:22px}
.field{margin-bottom:16px}
.field label{display:block;font-size:13px;font-weight:600;margin-bottom:6px}
.field .hint{font-size:12px;color:var(--dim);font-weight:400}
.field input,.field select{width:100%;height:40px;padding:0 12px;border:1px solid var(--line);border-radius:var(--r);
  background:var(--paper);color:var(--ink);font-family:var(--font-body);font-size:14px}
.field input:focus,.field select:focus{border-color:var(--copper)}
.result__big{font-family:var(--font-display);font-size:44px;font-weight:600;color:var(--copper);line-height:1}
.result__unit{font-size:18px;color:var(--ink-soft)}
.result__row{display:flex;justify-content:space-between;padding:9px 0;border-bottom:1px solid var(--line-2);font-size:14px}
.result__row span:last-child{font-family:var(--font-mono);font-weight:500}
.result__note{margin-top:14px;font-size:12.5px;color:var(--dim)}
.badge-pass{color:var(--green);font-weight:600}.badge-fail{color:var(--red);font-weight:600}
.formula{font-family:var(--font-mono);font-size:12px;background:var(--paper-2);padding:8px 12px;border-radius:var(--r);color:var(--ink-soft);margin-top:10px}

/* tables */
.tbl{width:100%;border-collapse:collapse;font-size:14px;margin:14px 0}
.tbl th,.tbl td{padding:9px 12px;text-align:left;border-bottom:1px solid var(--line-2)}
.tbl th{font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:var(--dim)}
.tbl td.mono,.tbl th.mono{font-family:var(--font-mono)}
.tbl tr:hover td{background:var(--paper-2)}
.tbl-wrap{overflow-x:auto}

/* ---------- state explorer ---------- */
.map-wrap{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:18px;overflow-x:auto}
.usmap path{fill:var(--paper-2);stroke:var(--paper);stroke-width:.7;cursor:pointer;transition:fill .12s}
.usmap path:hover{fill:var(--copper-soft)}
.usmap path.nec2023{fill:color-mix(in srgb,var(--copper) 55%,var(--paper-2))}
.usmap path.nec2020{fill:color-mix(in srgb,var(--copper) 32%,var(--paper-2))}
.usmap path.nec2017{fill:color-mix(in srgb,var(--copper) 16%,var(--paper-2))}
.usmap path.older{fill:var(--paper-2)}
.map-legend{display:flex;gap:16px;flex-wrap:wrap;margin-top:14px;font-size:12px;color:var(--ink-soft)}
.map-legend i{display:inline-block;width:14px;height:14px;border-radius:3px;margin-right:6px;vertical-align:-2px}

/* ---------- timeline page ---------- */
.tl{position:relative;margin:30px 0;padding-left:30px;border-left:2px solid var(--line)}
.tl__item{position:relative;margin-bottom:30px}
.tl__item::before{content:"";position:absolute;left:-37px;top:3px;width:14px;height:14px;border-radius:50%;
  background:var(--copper);border:3px solid var(--paper)}
.tl__year{font-family:var(--font-display);font-weight:700;font-size:22px;color:var(--copper)}
.tl__t{font-weight:600;margin:2px 0 4px}
.tl__d{font-size:14px;color:var(--ink-soft);max-width:65ch}

/* ---------- glossary ---------- */
.gloss-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:14px}
.gterm{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:16px}
.gterm h3{font-size:16px;margin-bottom:4px}
.gterm .abbr{font-family:var(--font-mono);font-size:12px;color:var(--copper)}
.gterm p{font-size:13.5px;color:var(--ink-soft);margin-top:6px}

/* ---------- ad slots ---------- */
.adslot{display:block;margin:26px 0;min-height:90px}
.adslot--ph{border:1px dashed var(--line);border-radius:var(--r);background:var(--paper-2);
  display:flex;align-items:center;justify-content:center;color:var(--dim);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;text-transform:uppercase;min-height:100px}
.adslot--ph span{opacity:.6}

/* ---------- diagrams (safe vs unsafe) ---------- */
.dg-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(400px,1fr));gap:20px}
.diagram{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:18px;box-shadow:var(--shadow)}
.dg-head{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:8px;flex-wrap:wrap}
.dg-head h3{font-size:17px}
.dg-ref{font-family:var(--font-mono);font-size:12px;color:var(--copper)}
.dg-switch{display:flex;align-items:center;gap:8px;cursor:pointer;user-select:none}
.dg-switch input{position:absolute;opacity:0}
.dg-track{width:42px;height:22px;border-radius:12px;background:var(--green);position:relative;transition:background .2s}
.dg-thumb{position:absolute;top:2px;left:2px;width:18px;height:18px;border-radius:50%;background:#fff;transition:transform .2s}
.diagram.unsafe .dg-track{background:var(--red)}
.diagram.unsafe .dg-thumb{transform:translateX(20px)}
.dg-state{font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;text-transform:uppercase}
.diagram.safe .s-off,.diagram.unsafe .s-on{display:none}
.diagram.safe .dg-state{color:var(--green)} .diagram.unsafe .dg-state{color:var(--red)}
.dg-canvas{background:var(--paper-2);border-radius:var(--r);padding:8px;color:var(--ink-soft)}
.dg-canvas svg{width:100%;height:auto;display:block}
.dg-lbl{font-family:var(--font-mono);font-size:10px;fill:var(--ink-soft)}
.dg-breaker{fill:var(--green)} .diagram.unsafe .dg-breaker{fill:var(--red)}
.dg-hot{stroke:var(--red)} .dg-neutral{stroke:var(--blue)} .dg-egc{stroke:var(--green)} .dg-gfci{fill:var(--green);stroke:none}
.dg-box{stroke:var(--ink-soft)}
.only-safe{display:none} .only-unsafe{display:none}
.diagram.safe .only-safe{display:inline} .diagram.unsafe .only-unsafe{display:inline}
.diagram.safe .dg-fault,.diagram.safe .dg-leak{display:none}
.dg-fault,.dg-leak{stroke:var(--red)}
figure.diagram figcaption{margin-top:10px;font-size:13.5px;line-height:1.5}
.diagram.safe .cap-unsafe,.diagram.unsafe .cap-safe{display:none}
.cap-safe{color:var(--green)} .cap-unsafe{color:var(--red)}
/* animated current flow (respect reduced motion via global rule) */
.dg-flow{stroke-dasharray:6 8;animation:flow 1.1s linear infinite}
@keyframes flow{to{stroke-dashoffset:-28}}
.diagram.unsafe .dg-shock{animation:buzz .12s steps(2) infinite}
@keyframes buzz{50%{transform:translate(1px,-1px)}}
.dg-spark{animation:sparkblink .5s steps(2) infinite}
@keyframes sparkblink{50%{opacity:0}}
.dg-heat{animation:rise 1.6s ease-in-out infinite;opacity:.7}
@keyframes rise{0%{opacity:0;transform:translateY(6px)}50%{opacity:.8}100%{opacity:0;transform:translateY(-6px)}}

/* ---------- quiz ---------- */
.quiz-card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:24px;max-width:640px;box-shadow:var(--shadow)}
.quiz-prog{display:flex;justify-content:space-between;align-items:center;font-family:var(--font-mono);font-size:12px;color:var(--dim);margin-bottom:12px}
.quiz-q{font-size:20px;margin-bottom:18px;line-height:1.3}
.quiz-opts{display:grid;gap:10px}
.quiz-opt{text-align:left;padding:13px 16px;border:1px solid var(--line);border-radius:var(--r);background:var(--paper);
  color:var(--ink);font-family:var(--font-body);font-size:15px;cursor:pointer;transition:border-color .12s,background .12s}
.quiz-opt:hover:not(:disabled){border-color:var(--copper)}
.quiz-opt:disabled{cursor:default}
.quiz-opt.correct{border-color:var(--green);background:color-mix(in srgb,var(--green) 15%,transparent);font-weight:600}
.quiz-opt.wrong{border-color:var(--red);background:color-mix(in srgb,var(--red) 12%,transparent)}
.quiz-fb{margin-top:16px;padding:13px 16px;border-radius:var(--r);font-size:14px;line-height:1.5}
.quiz-fb.ok{background:color-mix(in srgb,var(--green) 12%,transparent);border:1px solid color-mix(in srgb,var(--green) 40%,transparent)}
.quiz-fb.no{background:color-mix(in srgb,var(--amber) 12%,transparent);border:1px solid color-mix(in srgb,var(--amber) 40%,transparent)}
.quiz-ref{display:block;margin-top:6px;font-family:var(--font-mono);font-size:11.5px;color:var(--dim)}
#quizNext{margin-top:16px}

/* ---------- field note (authored by crew) ---------- */
.fieldnote{display:flex;gap:14px;margin:24px 0;padding:18px 20px;background:var(--card);
  border:1px solid var(--line);border-left:3px solid var(--copper);border-radius:var(--r)}
.fn__av{flex-shrink:0;width:44px;height:44px;border-radius:50%;background:var(--copper);color:#fff;
  display:flex;align-items:center;justify-content:center;font-family:var(--font-display);font-weight:700;
  font-size:15px;text-decoration:none}
.fn__av:hover{background:var(--copper-ink)}
.fn__label{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--dim);margin-bottom:6px}
.fieldnote blockquote{font-size:15.5px;font-style:italic;color:var(--ink);line-height:1.5;border:0;margin:0;padding:0}
.fieldnote figcaption{margin-top:8px;font-size:13px;color:var(--ink-soft)}
.fieldnote figcaption a{color:var(--copper);text-decoration:none;font-weight:600}
.fieldnote figcaption a:hover{text-decoration:underline}

/* ---------- crew page ---------- */
.crew-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:18px}
.crew-card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:22px;box-shadow:var(--shadow);scroll-margin-top:80px}
.crew-card__head{display:flex;align-items:center;gap:14px;margin-bottom:14px}
.crew-av{width:52px;height:52px;border-radius:50%;background:var(--copper);color:#fff;display:flex;align-items:center;
  justify-content:center;font-family:var(--font-display);font-weight:700;font-size:18px}
.crew-card h3{font-size:19px}
.crew-role{font-family:var(--font-mono);font-size:12px;color:var(--copper);margin-top:2px}
.crew-bio{font-size:14.5px;color:var(--ink-soft);line-height:1.55}
.crew-meta{margin-top:16px;border-top:1px solid var(--line-2);padding-top:14px;display:grid;gap:10px}
.crew-meta>div{display:flex;justify-content:space-between;gap:16px}
.crew-meta dt{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--dim);flex-shrink:0}
.crew-meta dd{font-size:13.5px;text-align:right;color:var(--ink)}

/* ---------- footer ---------- */
.footer{border-top:1px solid var(--line);background:var(--paper-2);margin-top:40px}
.footer__grid{max-width:var(--maxw);margin:0 auto;padding:40px 28px;display:grid;
  grid-template-columns:1.6fr 1fr 1fr 1fr;gap:30px}
.footer__brand{font-size:20px}
.footer__note{font-size:12.5px;color:var(--dim);margin-top:10px;max-width:40ch}
.footer h4{font-size:12px;text-transform:uppercase;letter-spacing:.1em;color:var(--dim);margin-bottom:10px;font-family:var(--font-mono);font-weight:500}
.footer nav a{display:block;font-size:14px;color:var(--ink-soft);text-decoration:none;padding:4px 0}
.footer nav a:hover{color:var(--copper)}
.footer__base{max-width:var(--maxw);margin:0 auto;padding:16px 28px;border-top:1px solid var(--line);
  display:flex;justify-content:space-between;gap:16px;font-size:12px;color:var(--dim);flex-wrap:wrap}
.footer__ver{font-family:var(--font-mono)}

/* ---------- toast + popover ---------- */
.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%) translateY(20px);opacity:0;
  background:var(--ink);color:var(--paper);padding:12px 20px;border-radius:var(--r);z-index:300;
  transition:opacity .2s,transform .2s;font-size:14px;box-shadow:var(--shadow-lg)}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
.popover{position:fixed;z-index:250;max-width:280px;background:var(--card);border:1px solid var(--copper);
  border-radius:var(--r);padding:12px 14px;box-shadow:var(--shadow-lg);font-size:13px}
.popover h5{font-family:var(--font-display);font-size:14px;margin-bottom:4px;color:var(--copper)}

.empty{text-align:center;color:var(--dim);padding:60px 20px}
.empty svg{color:var(--line);margin-bottom:12px}

/* ---------- responsive ---------- */
@media (max-width:1080px){
  .footer__grid{grid-template-columns:1fr 1fr}
  .hero__stats{display:none}
}
@media (max-width:880px){
  .topnav{display:none}
  .topbar__menu{display:inline-flex}
  .sidebar{position:fixed;left:0;top:var(--topbar-h);z-index:130;background:var(--paper);
    transform:translateX(-100%);transition:transform .2s;box-shadow:var(--shadow-lg)}
  .sidebar.open{transform:translateX(0)}
  .sidebar__scrim{display:block;position:fixed;inset:var(--topbar-h) 0 0;background:rgba(0,0,0,.4);z-index:125}
  .calc{grid-template-columns:1fr}
  .hero__h{font-size:clamp(40px,12vw,72px);transform:translateY(-70px)}
  .brand__sub{display:none}
}
@media (max-width:560px){
  .search__kbd{display:none}
  .footer__grid{grid-template-columns:1fr}
  .wrap{padding:24px 16px 48px}
}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.001s!important;scroll-behavior:auto}
  .fil,.lead{stroke-dashoffset:0}
}

/* ============================================================
   MOBILE OPTIMIZATION (Android Chrome + iOS Safari)
   ============================================================ */
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
body{-webkit-tap-highlight-color:transparent;overflow-x:hidden}
/* notch / safe-area padding so nothing hides under rounded corners or the home bar */
.topbar__inner{padding-left:max(18px,env(safe-area-inset-left));padding-right:max(18px,env(safe-area-inset-right))}
.wrap{padding-left:max(28px,env(safe-area-inset-left));padding-right:max(28px,env(safe-area-inset-right))}
.footer__grid,.footer__base{padding-left:max(28px,env(safe-area-inset-left));padding-right:max(28px,env(safe-area-inset-right))}

@media (max-width:880px){
  /* two-row top bar: controls on top, full-width search below */
  :root{--topbar-h:112px}
  .topbar{height:auto}
  .topbar__inner{flex-wrap:wrap;row-gap:8px;padding-top:8px;padding-bottom:8px;gap:10px}
  .search{order:5;flex-basis:100%;max-width:none;margin:0}
  .brand{margin-right:auto}

  /* prevent iOS zoom-on-focus: form fields must be ≥16px */
  .search__input,.field input,.field select,#glossFilter{font-size:16px}
  .field input,.field select{height:46px}
  /* finger-friendly hit targets (≥44px) */
  .iconbtn{width:42px;height:42px}
  .sb__link{padding-top:12px;padding-bottom:12px}
  .topnav a{padding:11px 12px}
  .quiz-opt{padding:15px 16px}
  .chip{padding:9px 14px}
  .lang-toggle button{padding:10px 12px}
  .dg-switch{padding:6px 0}

  /* hero: switch from absolute overlay to a clean stacked flow */
  .hero{height:auto;min-height:0;padding:36px 0 44px}
  .hero__arc{opacity:.45}
  .hero__content{position:static;display:flex;flex-direction:column;gap:14px}
  .hero__eyebrow,.hero__h,.hero__lede,.hero__stats{position:static;transform:none;left:auto;right:auto;top:auto;bottom:auto;max-width:none}
  .hero__h{font-size:clamp(38px,11vw,62px)}
  .hero__lede{max-width:38ch}
  .hero__stats{display:flex;flex-direction:row;flex-wrap:wrap;gap:16px 26px;text-align:left;margin-top:6px}

  /* single-column content grids feel better than cramped 2-up */
  .dg-list{grid-template-columns:1fr}
  .state-list{columns:1!important}
}
@media (max-width:560px){
  .cards{grid-template-columns:1fr}
  .tool-grid{grid-template-columns:1fr 1fr}
  .crew-grid{grid-template-columns:1fr}
  .hero__stats .hs__v{font-size:19px}
  .page-title{font-size:clamp(26px,7vw,34px)}
  /* keep the top bar from overflowing on narrow phones */
  .search{max-width:none}
  .brand__word{font-size:17px}
}
/* let the sidebar drawer clear the notch when open */
@media (max-width:880px){
  .sidebar__scroll{padding-left:max(12px,env(safe-area-inset-left))}
}