/* ─────────────────────────────────────────────────────────
   Mechanistic Health · Site Stylesheet
   Tokens · Layout · Components · Pages
   ─────────────────────────────────────────────────────── */

:root{
  /* tokens — light (paper) */
  --ink:#0B1A2B;
  --ink-soft:#2c3744;
  --ink-faint:#6b7480;
  --paper:#F4F6F8;
  --paper-warm:#ECEEF1;
  --paper-card:#FFFFFF;
  --rule:#C9D2DD;
  --rule-strong:#A8B5C5;

  --cobalt:#1F3A6E;
  --cobalt-deep:#0E2148;
  --cobalt-light:#7FA6E8;
  --ice:#DCE6F1;
  --signal:#C8553D;

  --safe:#2E7D5B;
  --moderate:#C99A2E;
  --risky:#D87024;
  --danger:#C8453A;
  --lethal:#7A1F1A;

  --accent: var(--cobalt);
  --accent-deep: var(--cobalt-deep);

  --serif:'Newsreader', Georgia, serif;
  --sans:'IBM Plex Sans', system-ui, sans-serif;
  --mono:'IBM Plex Mono', ui-monospace, monospace;

  --pad-sec: 96px;
  --gap-sec: 48px;
  --container: 1280px;
}

/* ── density modes ── */
[data-density="compact"]{
  --pad-sec: 64px;
  --gap-sec: 32px;
}

/* ── dark mode ── */
[data-theme="dark"]{
  --ink:#E8EEF6;
  --ink-soft:#B6C2D2;
  --ink-faint:#8794A5;
  --paper:#0A1320;
  --paper-warm:#0F1B2C;
  --paper-card:#101D30;
  --rule:#243348;
  --rule-strong:#3A4D69;

  --cobalt:#7FA6E8;
  --cobalt-deep:#A6C2EE;
  --cobalt-light:#C5D9F2;
  --ice:#1A2B45;
}

/* ── accent variants ── */
[data-accent="signal"]{ --accent:#C8553D; --accent-deep:#9C3F2C; }
[data-accent="ink"]{ --accent: var(--ink); --accent-deep: var(--ink-soft); }

/* ── reset ── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;background:var(--paper)}
body{
  background:var(--paper); color:var(--ink);
  font-family:var(--sans); font-size:16px; line-height:1.55;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
a{color:inherit; text-decoration:none}
img,svg{display:block; max-width:100%}
button{font:inherit; cursor:pointer; border:none; background:none; color:inherit}
ul,ol{list-style:none}
hr{border:0; height:1px; background:var(--rule)}

::selection{background:var(--accent); color:#fff}

/* ── layout primitives ── */
.container{max-width:var(--container); margin:0 auto; padding:0 56px}
.rule{height:1px; background:var(--rule); width:100%}
.kicker{
  font-family:var(--mono); font-size:11px; letter-spacing:0.16em;
  text-transform:uppercase; color:var(--accent);
}
.kicker .dot{
  display:inline-block; width:6px; height:6px; border-radius:50%;
  background:var(--accent); margin-right:10px; vertical-align:middle;
  transform:translateY(-1px);
}
.mono{font-family:var(--mono); letter-spacing:0.04em}
.serif{font-family:var(--serif)}

/* ── nav ── */
.nav{
  position:sticky; top:0; z-index:50;
  background:color-mix(in oklab, var(--paper) 92%, transparent);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--rule);
}
.nav-inner{
  max-width:var(--container); margin:0 auto;
  display:flex; justify-content:space-between; align-items:center;
  padding:18px 56px;
}
.nav-brand{display:flex; align-items:center; gap:12px}
.nav-brand .wordmark{
  font-family:var(--serif); font-size:18px; font-weight:500;
  letter-spacing:-0.01em; line-height:1; color:var(--ink);
}
.nav-brand .wordmark em{color:var(--accent); font-style:italic}
.nav-links{display:flex; gap:28px; align-items:center}
.nav-links a{font-size:13px; color:var(--ink-soft); transition:color .18s}
.nav-links a:hover, .nav-links a.active{color:var(--accent)}
.nav-cta{
  display:inline-flex; align-items:center; gap:8px;
  padding:10px 14px; background:var(--ink); color:var(--paper);
  font-size:13px; font-weight:500;
}
.nav-cta:hover{background:var(--accent)}
[data-theme="dark"] .nav-cta{background:var(--accent); color:#0A1320}
[data-theme="dark"] .nav-cta:hover{background:var(--cobalt-light)}
.nav-burger{display:none}

/* ── buttons ── */
.btn{
  display:inline-flex; align-items:center; gap:8px; padding:13px 20px;
  font-family:var(--sans); font-weight:500; font-size:14px;
  letter-spacing:0.02em; line-height:1; transition:all .18s;
  white-space:nowrap; border:1px solid transparent;
}
.btn .arrow{transition:transform .18s}
.btn:hover .arrow{transform:translateX(3px)}
.btn-primary{background:var(--accent); color:#fff}
.btn-primary:hover{background:var(--accent-deep)}
.btn-ink{background:var(--ink); color:var(--paper)}
.btn-ink:hover{background:var(--accent)}
.btn-secondary{background:transparent; color:var(--ink); border-color:var(--ink)}
.btn-secondary:hover{background:var(--ink); color:var(--paper)}
.btn-ghost{background:transparent; color:var(--accent); padding:13px 4px}
.btn-ghost:hover{color:var(--ink)}

/* ── tags & badges ── */
.tag{
  display:inline-block; padding:5px 9px; border:1px solid var(--rule-strong);
  font-family:var(--mono); font-size:10px; letter-spacing:0.06em;
  color:var(--ink-soft); background:transparent; white-space:nowrap;
}
.badge{
  display:inline-block; padding:4px 10px; color:#fff;
  font-family:var(--mono); font-size:10px; font-weight:500;
  letter-spacing:0.1em; text-transform:uppercase;
}
.badge-live{background:var(--safe)}
.badge-soon{background:var(--cobalt)}
.badge-planned{background:var(--ink-soft)}
.badge-rd{background:var(--signal)}

/* ── hero ── */
.hero{padding:96px 0 88px; position:relative; overflow:hidden}
.hero-grid{
  display:grid; grid-template-columns:1.45fr 1fr; gap:64px;
  align-items:end; padding-bottom:48px;
}
.hero h1{
  font-family:var(--serif); font-weight:500;
  font-size:clamp(56px, 8vw, 116px);
  letter-spacing:-0.03em; line-height:0.95; color:var(--ink);
}
.hero h1 em{font-style:italic; color:var(--accent)}
.hero-sub{
  font-size:20px; line-height:1.55; color:var(--ink-soft);
  margin:32px 0 0; max-width:560px;
}
.hero-sub strong{color:var(--ink); font-weight:500}
.hero-cta{display:flex; gap:16px; margin-top:36px; flex-wrap:wrap}

/* hero figure */
.hero-fig{
  position:relative; border:1px solid var(--rule); background:var(--paper-card);
  padding:24px; aspect-ratio:1/1.1; min-height:420px;
}
.hero-fig .fig-tag{
  position:absolute; top:14px; left:14px;
  font-family:var(--mono); font-size:10px; letter-spacing:0.14em;
  color:var(--accent);
}
.hero-fig .fig-foot{
  position:absolute; bottom:14px; left:14px; right:14px;
  font-family:var(--mono); font-size:10px; letter-spacing:0.1em;
  color:var(--ink-faint);
  display:flex; justify-content:space-between;
}

/* hero stat strip */
.hero-stats{
  display:grid; grid-template-columns:repeat(4, 1fr); gap:0;
  border-top:1px solid var(--rule); border-bottom:1px solid var(--rule);
  margin-top:24px;
}
.hero-stat{
  padding:24px 28px; border-right:1px solid var(--rule);
}
.hero-stat:last-child{border-right:none}
.hero-stat .num{
  font-family:var(--serif); font-size:48px; font-weight:500;
  letter-spacing:-0.02em; line-height:1; color:var(--ink);
}
.hero-stat .num em{color:var(--accent); font-style:italic}
.hero-stat .lbl{
  font-family:var(--mono); font-size:10px; letter-spacing:0.14em;
  color:var(--ink-faint); text-transform:uppercase; margin-top:10px;
}

/* ── sections ── */
section{padding:var(--pad-sec) 0; border-top:1px solid var(--rule)}
.sec-head{
  display:grid; grid-template-columns:200px 1fr; gap:40px;
  margin-bottom:var(--gap-sec); align-items:start;
}
.sec-num{
  font-family:var(--mono); font-size:11px; letter-spacing:0.16em;
  color:var(--accent);
}
.sec-title{
  font-family:var(--serif); font-weight:500;
  font-size:clamp(36px, 4.5vw, 56px);
  letter-spacing:-0.022em; line-height:1.02; margin:0 0 18px;
}
.sec-title em{color:var(--accent); font-style:italic}
.sec-lede{
  font-size:18px; line-height:1.55; color:var(--ink-soft); max-width:680px;
}

/* ── grids ── */
.grid{display:grid; gap:24px}
.g2{grid-template-columns:repeat(2, 1fr)}
.g3{grid-template-columns:repeat(3, 1fr)}
.g4{grid-template-columns:repeat(4, 1fr)}
.g6{grid-template-columns:repeat(6, 1fr)}

/* ── card ── */
.card{
  background:var(--paper-card); border:1px solid var(--rule);
  padding:28px; position:relative; transition:border-color .18s, transform .18s;
}
.card:hover{border-color:var(--rule-strong)}
.card .card-head{
  display:flex; align-items:flex-start; justify-content:space-between;
  gap:16px; margin-bottom:18px;
}
.card .card-icon{
  width:44px; height:44px; flex-shrink:0;
  display:flex; align-items:center; justify-content:center;
  border:1px solid var(--rule); color:var(--accent);
}
.card .card-icon svg{width:24px; height:24px}
.card h3{
  font-family:var(--serif); font-size:24px; font-weight:500;
  letter-spacing:-0.01em; line-height:1.15; color:var(--ink); margin:14px 0 8px;
}
.card .card-sub{
  font-family:var(--mono); font-size:11px; letter-spacing:0.1em;
  color:var(--ink-faint); text-transform:uppercase; margin-bottom:14px;
}
.card p{font-size:14px; line-height:1.6; color:var(--ink-soft)}
.card .card-tags{display:flex; gap:6px; flex-wrap:wrap; margin-top:18px}

/* ── bullets list ── */
.bullets{display:flex; flex-direction:column; gap:14px; margin-top:24px}
.bullets li{
  display:flex; gap:14px; align-items:flex-start;
  padding:14px 0; border-top:1px solid var(--rule);
  font-size:15px; line-height:1.55; color:var(--ink);
}
.bullets li:last-child{border-bottom:1px solid var(--rule)}
.bullets li .bullet-mark{
  flex-shrink:0; width:24px; height:24px; color:var(--accent);
  display:flex; align-items:center; justify-content:center;
}
.bullets li .bullet-mark svg{width:18px; height:18px}

/* ── pull quote ── */
.pullquote{
  border-left:3px solid var(--accent);
  padding:18px 28px; margin:48px 0 0;
  font-family:var(--serif); font-size:22px; font-weight:400;
  line-height:1.45; color:var(--ink); font-style:italic;
}
.pullquote .attr{
  display:block; margin-top:18px;
  font-family:var(--mono); font-size:11px; letter-spacing:0.12em;
  text-transform:uppercase; color:var(--ink-faint); font-style:normal;
}

/* ── interaction checker (live demo) ── */
.checker{
  background:var(--paper-card); border:1px solid var(--rule);
  padding:32px; position:relative;
}
.checker .checker-head{
  display:flex; justify-content:space-between; align-items:baseline;
  margin-bottom:24px;
}
.checker .checker-head h3{
  font-family:var(--serif); font-size:28px; font-weight:500;
  letter-spacing:-0.01em; line-height:1.1;
}
.checker .pill-bar{
  display:flex; gap:8px; flex-wrap:wrap; align-items:center;
  padding:18px; background:var(--paper-warm); border:1px solid var(--rule);
}
.checker .pill{
  display:inline-flex; align-items:center; gap:6px;
  padding:8px 14px; background:var(--paper-card); border:1px solid var(--rule-strong);
  font-family:var(--serif); font-size:18px; font-weight:500; color:var(--ink);
  cursor:pointer; transition:all .18s;
}
.checker .pill:hover{border-color:var(--accent); color:var(--accent)}
.checker .pill.active{background:var(--ink); color:var(--paper); border-color:var(--ink)}
[data-theme="dark"] .checker .pill.active{background:var(--accent); color:#0A1320}
.checker .pill .x{
  font-family:var(--mono); font-size:14px; opacity:0; transition:opacity .18s;
}
.checker .pill.active .x{opacity:0.7}
.checker .plus{
  font-family:var(--serif); font-size:24px; color:var(--ink-faint);
}
.checker .verdict{
  display:flex; align-items:center; gap:18px; padding:24px;
  margin-top:20px; background:var(--paper-warm);
  border-left:4px solid var(--rule);
}
.checker .verdict.tier-safe{border-left-color:var(--safe)}
.checker .verdict.tier-moderate{border-left-color:var(--moderate)}
.checker .verdict.tier-risky{border-left-color:var(--risky)}
.checker .verdict.tier-dangerous{border-left-color:var(--danger)}
.checker .verdict.tier-lethal{border-left-color:var(--lethal)}
.checker .verdict-mark{
  width:52px; height:52px; flex-shrink:0;
  display:flex; align-items:center; justify-content:center;
  font-family:var(--mono); font-size:11px; font-weight:600;
  letter-spacing:0.08em; color:#fff; text-align:center;
}
.checker .verdict.tier-safe .verdict-mark{background:var(--safe)}
.checker .verdict.tier-moderate .verdict-mark{background:var(--moderate)}
.checker .verdict.tier-risky .verdict-mark{background:var(--risky)}
.checker .verdict.tier-dangerous .verdict-mark{background:var(--danger)}
.checker .verdict.tier-lethal .verdict-mark{background:var(--lethal)}
.checker .verdict h4{
  font-family:var(--serif); font-size:24px; font-weight:500;
  letter-spacing:-0.01em; line-height:1.25; margin-bottom:8px;
}
.checker .verdict .verdict-sub{font-size:14px; color:var(--ink-soft); line-height:1.5}
.checker .mech{display:grid; grid-template-columns:1fr 1fr; gap:20px; margin-top:20px}
.checker .mech .panel{
  padding:18px; background:var(--paper); border:1px solid var(--rule);
}
.checker .mech .panel h5{
  font-family:var(--mono); font-size:10px; letter-spacing:0.14em;
  text-transform:uppercase; color:var(--accent); margin-bottom:10px;
}
.checker .mech .panel li{
  padding:6px 0; font-size:14px; line-height:1.5; color:var(--ink-soft);
  border-top:1px solid var(--rule);
}
.checker .mech .panel li:first-child{border-top:none}
.checker .citations{
  display:flex; gap:8px; flex-wrap:wrap; margin-top:18px;
  font-family:var(--mono); font-size:11px;
}
.checker .citations span{color:var(--ink-faint)}
.checker .citations a{color:var(--accent); text-decoration:underline; text-underline-offset:3px}

/* ── feature grid (atlas core features) ── */
.feature{
  background:var(--paper-card); border:1px solid var(--rule); padding:28px;
  display:flex; flex-direction:column; gap:14px;
}
.feature-icon{
  width:48px; height:48px;
  display:flex; align-items:center; justify-content:center;
  border:1px solid var(--rule); color:var(--accent);
}
.feature-icon svg{width:26px; height:26px}
.feature h4{
  font-family:var(--serif); font-size:22px; font-weight:500;
  letter-spacing:-0.01em; line-height:1.2;
}
.feature p{font-size:14px; line-height:1.6; color:var(--ink-soft)}

/* ── privacy strip ── */
.privacy-strip{
  display:grid; grid-template-columns:repeat(3, 1fr); gap:1px;
  background:var(--rule); border:1px solid var(--rule);
}
.privacy-strip .cell{
  background:var(--paper-card); padding:28px;
  display:flex; flex-direction:column; gap:12px;
}
.privacy-strip .cell .icon{
  width:40px; height:40px; color:var(--accent);
}
.privacy-strip .cell h4{
  font-family:var(--serif); font-size:20px; font-weight:500; line-height:1.2;
}
.privacy-strip .cell p{font-size:14px; line-height:1.55; color:var(--ink-soft)}

/* ── notify (signup) ── */
.notify{
  border:1px solid var(--rule); background:var(--paper-card); padding:48px;
  display:grid; grid-template-columns:1fr 1fr; gap:48px; align-items:center;
}
.notify h3{
  font-family:var(--serif); font-size:42px; font-weight:500;
  letter-spacing:-0.02em; line-height:1.05;
}
.notify h3 em{color:var(--accent); font-style:italic}
.notify p{color:var(--ink-soft); margin-top:14px; font-size:16px}
.notify form{display:flex; gap:0; border:1px solid var(--rule)}
.notify input{
  flex:1; padding:16px 18px; border:none; background:var(--paper-card);
  font:inherit; color:var(--ink); outline:none;
}
.notify button{
  padding:16px 24px; background:var(--ink); color:var(--paper);
  font-weight:500; font-size:14px; border:none;
}
[data-theme="dark"] .notify button{background:var(--accent); color:#0A1320}
.notify .small{
  font-family:var(--mono); font-size:11px; letter-spacing:0.06em;
  color:var(--ink-faint); margin-top:14px;
}
.notify-hidden{display:none !important}

/* ── footer ── */
footer.site-foot{
  background:var(--ink); color:var(--paper); padding:80px 0 32px; margin-top:0;
}
[data-theme="dark"] footer.site-foot{background:#050B14}
footer .foot-grid{
  display:grid; grid-template-columns:1.5fr repeat(4, 1fr); gap:48px;
  padding-bottom:48px; border-bottom:1px solid rgba(255,255,255,0.12);
}
footer .foot-brand .wordmark{
  font-family:var(--serif); font-size:24px; font-weight:500;
  letter-spacing:-0.01em; line-height:1; color:var(--paper);
  display:flex; align-items:center; gap:12px;
}
footer .foot-brand .wordmark em{color:var(--cobalt-light); font-style:italic}
footer .foot-brand p{
  margin-top:18px; font-size:14px; line-height:1.6; color:rgba(255,255,255,0.7);
  max-width:340px;
}
footer .foot-brand .addr{
  margin-top:24px; font-family:var(--mono); font-size:11px;
  letter-spacing:0.08em; color:rgba(255,255,255,0.55); line-height:1.7;
}
footer .foot-brand .addr a{color:var(--cobalt-light)}
footer h5{
  font-family:var(--mono); font-size:10px; letter-spacing:0.14em;
  text-transform:uppercase; color:var(--cobalt-light); margin-bottom:18px;
}
footer .foot-links{display:flex; flex-direction:column; gap:10px}
footer .foot-links a{
  font-size:13px; color:rgba(255,255,255,0.75); transition:color .18s;
}
footer .foot-links a:hover{color:#fff}
footer .foot-links a .badge-soon,
footer .foot-links a .badge-planned,
footer .foot-links a .badge-rd{
  font-size:8px; padding:2px 6px; margin-left:6px; vertical-align:middle;
}
footer .foot-bottom{
  display:flex; justify-content:space-between; align-items:center;
  padding-top:32px; font-family:var(--mono); font-size:11px;
  letter-spacing:0.06em; color:rgba(255,255,255,0.55); flex-wrap:wrap; gap:16px;
}
footer .disclaimer{
  margin-top:24px; font-family:var(--mono); font-size:10px;
  letter-spacing:0.06em; color:rgba(255,255,255,0.45); line-height:1.7;
  max-width:920px;
}

/* ── page header (sub-pages) ── */
.page-head{
  padding:80px 0 48px; border-bottom:1px solid var(--rule);
}
.page-head .crumb{
  font-family:var(--mono); font-size:11px; letter-spacing:0.14em;
  text-transform:uppercase; color:var(--accent); margin-bottom:18px;
}
.page-head h1{
  font-family:var(--serif); font-weight:500;
  font-size:clamp(48px, 6vw, 80px);
  letter-spacing:-0.025em; line-height:1.02;
}
.page-head h1 em{color:var(--accent); font-style:italic}
.page-head .lede{
  margin-top:24px; font-size:20px; line-height:1.55;
  color:var(--ink-soft); max-width:720px;
}
.page-head .meta{
  margin-top:24px; font-family:var(--mono); font-size:11px;
  letter-spacing:0.1em; color:var(--ink-faint);
}

/* ── prose (legal/help/citation) ── */
.prose{
  max-width:760px; margin:0 auto;
  font-size:16px; line-height:1.7; color:var(--ink-soft);
}
.prose h2{
  font-family:var(--serif); font-size:32px; font-weight:500;
  letter-spacing:-0.015em; line-height:1.15; color:var(--ink);
  margin:56px 0 18px;
}
.prose h3{
  font-family:var(--sans); font-size:18px; font-weight:600;
  color:var(--ink); margin:32px 0 10px;
}
.prose p{margin:14px 0}
.prose ul{margin:14px 0; padding-left:0}
.prose ul li{
  position:relative; padding:6px 0 6px 22px; line-height:1.6;
}
.prose ul li::before{
  content:""; position:absolute; left:0; top:14px; width:8px; height:1px;
  background:var(--accent);
}
.prose strong{color:var(--ink); font-weight:600}
.prose a{color:var(--accent); text-decoration:underline; text-underline-offset:3px}
.prose table{
  width:100%; border-collapse:collapse; margin:24px 0;
  background:var(--paper-card); border:1px solid var(--rule);
}
.prose table th, .prose table td{
  text-align:left; padding:14px 16px; border-bottom:1px solid var(--rule);
  font-size:14px;
}
.prose table thead th{
  font-family:var(--mono); font-size:10px; letter-spacing:0.12em;
  text-transform:uppercase; color:var(--ink-faint); background:var(--paper-warm);
}
.prose table tbody tr:last-child td{border-bottom:none}
.prose .callout{
  display:flex; gap:16px; padding:20px;
  background:var(--paper-warm); border-left:3px solid var(--accent);
  margin:24px 0; font-size:15px; line-height:1.55; color:var(--ink);
}
.prose .callout .ico{flex-shrink:0; width:24px; height:24px; color:var(--accent)}

/* ── citation list ── */
.cite-group{margin:48px 0 0}
.cite-group h2{
  font-family:var(--serif); font-size:28px; font-weight:500;
  letter-spacing:-0.015em; padding-bottom:12px;
  border-bottom:1px solid var(--rule); margin-bottom:0;
}
.cite{
  padding:24px 0; border-bottom:1px solid var(--rule);
  display:grid; grid-template-columns:140px 1fr; gap:32px; align-items:start;
}
.cite .cite-id{
  font-family:var(--mono); font-size:11px; letter-spacing:0.1em;
  color:var(--accent); line-height:1.5;
}
.cite .cite-id .cat{
  display:block; color:var(--ink-faint); font-size:10px; margin-top:4px;
}
.cite-body h4{
  font-family:var(--serif); font-size:18px; font-weight:500;
  line-height:1.3; color:var(--ink); margin-bottom:6px;
}
.cite-body .authors{
  font-size:14px; color:var(--ink-soft); margin-bottom:4px;
}
.cite-body .pub{
  font-family:var(--mono); font-size:12px; color:var(--ink-faint);
  font-style:italic; margin-bottom:10px;
}
.cite-body .doi{
  font-family:var(--mono); font-size:12px; color:var(--accent);
  text-decoration:underline; text-underline-offset:3px;
}
.cite-body .used{
  display:flex; gap:6px; flex-wrap:wrap; margin-top:12px;
}
.cite-body .used .tag{font-size:9px; padding:3px 7px}

/* ── faq ── */
.faq{
  border-top:1px solid var(--rule);
}
.faq details{
  border-bottom:1px solid var(--rule); padding:0;
}
.faq summary{
  cursor:pointer; padding:24px 0; display:flex; justify-content:space-between;
  align-items:center; gap:24px; list-style:none;
  font-family:var(--serif); font-size:22px; font-weight:500;
  letter-spacing:-0.01em; line-height:1.25; color:var(--ink);
}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{
  content:""; width:14px; height:14px; flex-shrink:0;
  background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%231F3A6E' stroke-width='2'><path d='M6 9l6 6 6-6'/></svg>");
  background-repeat:no-repeat; background-position:center; background-size:contain;
  transition:transform .18s;
}
.faq details[open] summary::after{transform:rotate(180deg)}
.faq .faq-body{
  padding:0 0 28px; font-size:16px; line-height:1.65; color:var(--ink-soft);
}
.faq .faq-body p{margin:0 0 12px}
.faq .faq-body p:last-child{margin-bottom:0}
.faq .faq-body strong{color:var(--ink); font-weight:600}

/* ── product spec sheet ── */
.spec{
  background:var(--paper-card); border:1px solid var(--rule); padding:32px;
  display:flex; flex-direction:column; gap:18px; height:100%;
}
.spec .spec-head{
  display:flex; justify-content:space-between; align-items:flex-start; gap:16px;
}
.spec .spec-icon{
  width:48px; height:48px; color:var(--accent);
  display:flex; align-items:center; justify-content:center;
  border:1px solid var(--rule);
}
.spec .spec-icon svg{width:26px; height:26px}
.spec h3{
  font-family:var(--serif); font-size:26px; font-weight:500;
  letter-spacing:-0.01em; line-height:1.15; color:var(--ink); margin-top:14px;
}
.spec .spec-sub{
  font-family:var(--mono); font-size:11px; letter-spacing:0.1em;
  color:var(--ink-faint); text-transform:uppercase;
}
.spec p{font-size:14px; line-height:1.6; color:var(--ink-soft)}
.spec .spec-tags{display:flex; gap:6px; flex-wrap:wrap; margin-top:auto; padding-top:14px}

/* ── responsive ── */
@media (max-width: 980px){
  .container{padding:0 24px}
  .nav-inner{padding:14px 24px}
  .nav-links{display:none}
  .nav-links.open{
    display:flex; position:absolute; top:100%; left:0; right:0;
    flex-direction:column; gap:0; background:var(--paper);
    border-bottom:1px solid var(--rule); padding:8px 24px 16px;
  }
  .nav-links.open a{padding:14px 0; border-top:1px solid var(--rule)}
  .nav-burger{
    display:flex; flex-direction:column; gap:5px; padding:8px;
  }
  .nav-burger span{width:22px; height:1.5px; background:var(--ink)}
  .hero{padding:48px 0 56px}
  .hero-grid{grid-template-columns:1fr; gap:40px}
  .hero-fig{aspect-ratio:1/1; min-height:340px}
  .hero-stats{grid-template-columns:1fr 1fr}
  .hero-stat{border-bottom:1px solid var(--rule)}
  .hero-stat:nth-child(2){border-right:none}
  .sec-head{grid-template-columns:1fr; gap:8px}
  .g2,.g3,.g4{grid-template-columns:1fr}
  .checker .mech{grid-template-columns:1fr}
  .privacy-strip{grid-template-columns:1fr}
  .notify{grid-template-columns:1fr; padding:32px}
  footer .foot-grid{grid-template-columns:1fr 1fr; gap:32px}
  .cite{grid-template-columns:1fr; gap:8px}
}

/* ── print ── */
@media print{
  .nav, footer, .notify, .checker .pill-bar{display:none}
}