/* ============================================================
   MERIDIAN — shared design system
   An 1830s admiralty chart room, rendered for the screen.
   ============================================================ */

/* ---- Tokens ------------------------------------------------ */
:root{
  /* paper */
  --vellum:#ece0c2;
  --vellum-deep:#ddcfa8;
  --card:#f4ecd6;
  --card-deep:#ece0c2;

  /* ink */
  --ink:#241a0c;
  --sepia:#42331d;
  --sepia-soft:#6a5536;

  /* charted water */
  --sea:#5b8076;
  --sea-deep:#2f4a45;
  --sea-bright:#7ba59c;
  --shoal:#92b6ae;

  /* gilt */
  --gilt-deep:#9a7a2e;
  --gilt:#c8a44e;
  --gilt-pale:#e7cf94;

  /* accents (sparing) */
  --wax:#8c3a2b;
  --indigo:#2c3a5e;

  /* mahogany (dark sections) */
  --mahog:#241308;
  --mahog-2:#321c0d;
  /* always-light foreground for permanently-dark sections */
  --lt:#ece0c2;
  --lt-soft:#c4b48f;
  /* accent that must read on dark furniture (gold in vellum, light elsewhere) */
  --ond:#c8a44e;
  /* ink colour that sits on a gilt-filled button */
  --gilt-ink:#2a200a;

  /* biomes */
  --b-plains:#c9bb86;
  --b-forest:#7d8f55;
  --b-desert:#d8c48a;
  --b-mountain:#b1a187;
  --b-ice:#e2e8e1;
  --b-water:#5b8076;

  /* type */
  --display:"IM Fell DW Pica","Cardo",Georgia,serif;
  --body:"Cardo",Georgia,"Times New Roman",serif;
  --mono:"Spline Sans Mono","IBM Plex Mono",ui-monospace,monospace;

  /* rhythm */
  --maxw:1280px;
  --gutter:clamp(20px,4vw,56px);
  --radius:3px;

  /* shadows — multi-layer plate lift */
  --lift-1:0 1px 1px rgba(36,26,12,.10),
           0 4px 10px rgba(36,26,12,.10),
           0 14px 30px rgba(36,26,12,.13);
  --lift-2:0 2px 3px rgba(36,26,12,.14),
           0 10px 22px rgba(36,26,12,.16),
           0 30px 60px rgba(36,26,12,.20);

  --ease:cubic-bezier(.2,.7,.2,1);
}

/* ---- Reset ------------------------------------------------- */
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{
  font-family:var(--body);
  font-size:19px;
  line-height:1.62;
  color:var(--ink);
  background:var(--vellum);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  position:relative;
  overflow-x:clip;
}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;cursor:pointer;background:none;border:none}

/* ---- Page materiality: grain + graticule + vignette ------- */
/* fixed full-viewport texture layers behind everything */
.tex{position:fixed;inset:0;pointer-events:none;z-index:0}
.tex--grain{
  opacity:.5;mix-blend-mode:multiply;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.5'/%3E%3C/svg%3E");
}
.tex--grat{
  --g:rgba(36,26,12,.045);
  background-image:
    linear-gradient(var(--g) 1px,transparent 1px),
    linear-gradient(90deg,var(--g) 1px,transparent 1px),
    linear-gradient(rgba(36,26,12,.025) 1px,transparent 1px),
    linear-gradient(90deg,rgba(36,26,12,.025) 1px,transparent 1px);
  background-size:128px 128px,128px 128px,32px 32px,32px 32px;
}
.tex--vig{
  background:radial-gradient(120% 90% at 50% 30%,transparent 55%,rgba(36,26,12,.16) 100%);
}
main,header,footer{position:relative;z-index:1}

/* ---- Layout ------------------------------------------------ */
.wrap{max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-block:clamp(64px,9vw,128px)}
.section--tight{padding-block:clamp(44px,6vw,80px)}

/* ---- Typography -------------------------------------------- */
.display{font-family:var(--display);font-weight:400;line-height:1.02;letter-spacing:.005em}
h1.display{font-size:clamp(44px,7vw,92px)}
h2.display{font-size:clamp(34px,4.6vw,60px);line-height:1.04}
h3{font-family:var(--display);font-weight:400;font-size:clamp(24px,2.4vw,32px);line-height:1.1}
p{max-width:64ch;text-wrap:pretty}
.lede{font-size:clamp(20px,2.1vw,25px);line-height:1.5;color:var(--sepia)}

/* labels — mono small-caps, wide tracking */
.label{
  font-family:var(--mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.28em;
  text-transform:uppercase;
  color:var(--sepia-soft);
}
.serial{font-family:var(--mono);font-size:12px;letter-spacing:.12em;color:var(--sepia-soft)}
.fig{font-family:var(--mono);font-variant-numeric:tabular-nums;letter-spacing:.01em}

.eyebrow{
  display:inline-flex;align-items:center;gap:.7em;
  font-family:var(--mono);font-size:12px;letter-spacing:.3em;text-transform:uppercase;
  color:var(--gilt-deep);margin-bottom:1.1rem;
}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--gilt-deep);opacity:.7}

/* ornamental divider */
.rule-orn{display:flex;align-items:center;justify-content:center;gap:14px;color:var(--gilt-deep);margin:0 auto}
.rule-orn::before,.rule-orn::after{content:"";height:1px;width:min(120px,18vw);
  background:linear-gradient(90deg,transparent,var(--gilt-deep))}
.rule-orn::after{background:linear-gradient(90deg,var(--gilt-deep),transparent)}
.rule-orn span{font-family:var(--display);font-size:20px;line-height:1}

/* ---- The Plate (double border + gilt inset + lift) -------- */
.plate{
  position:relative;
  background:
    linear-gradient(180deg,var(--card),var(--card-deep));
  border:1px solid var(--sepia);
  border-radius:var(--radius);
  box-shadow:var(--lift-1);
  transition:box-shadow .5s var(--ease),transform .5s var(--ease);
}
.plate::before{ /* inset gilt hairline frame */
  content:"";position:absolute;inset:6px;
  border:1px solid var(--gilt);
  opacity:.55;border-radius:1px;pointer-events:none;
}
.plate--hover:hover{transform:translateY(-4px);box-shadow:var(--lift-2)}
.plate--pad{padding:clamp(22px,3vw,38px)}
.plate__num{
  position:absolute;top:14px;right:16px;
  font-family:var(--mono);font-size:12px;letter-spacing:.15em;color:var(--gilt-deep);
}

/* corner flourishes (brass) */
.corners::after,.corners::before{content:"";position:absolute;width:18px;height:18px;
  border:1.5px solid var(--gilt-deep);opacity:.8;pointer-events:none}
.corners::before{top:10px;left:10px;border-right:none;border-bottom:none}
.corners::after{bottom:10px;right:10px;border-left:none;border-top:none}

/* ---- Buttons ----------------------------------------------- */
.btn{
  display:inline-flex;align-items:center;gap:.65em;
  font-family:var(--mono);font-size:13px;letter-spacing:.16em;text-transform:uppercase;
  padding:.95em 1.5em;border-radius:2px;border:1px solid var(--sepia);
  background:linear-gradient(180deg,var(--card),var(--card-deep));
  color:var(--ink);box-shadow:0 1px 0 rgba(255,255,255,.4) inset,var(--lift-1);
  transition:transform .4s var(--ease),box-shadow .4s var(--ease),background .4s var(--ease);
}
.btn .arrow{transition:transform .4s var(--ease)}
.btn:hover{transform:translateY(-2px);box-shadow:var(--lift-2)}
.btn:hover .arrow{transform:translateX(4px)}
.btn--gilt{
  background:linear-gradient(180deg,var(--gilt-pale),var(--gilt));
  border-color:var(--gilt-deep);color:var(--gilt-ink);
}
.btn--ghost{background:transparent;box-shadow:none}
.btn--dark{
  background:linear-gradient(180deg,var(--mahog-2),var(--mahog));
  border-color:#000;color:var(--lt);
}
.btn--lg{padding:1.1em 1.9em;font-size:14px}

/* ---- Nav --------------------------------------------------- */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:50;
  transition:padding .4s var(--ease),background .4s var(--ease),box-shadow .4s var(--ease),border-color .4s var(--ease);
  padding-block:22px;border-bottom:1px solid transparent;
}
.nav__in{display:flex;align-items:center;justify-content:space-between;gap:24px}
.nav.is-stuck{
  padding-block:12px;
  background:rgba(236,224,194,.82);
  backdrop-filter:blur(10px) saturate(1.1);
  -webkit-backdrop-filter:blur(10px) saturate(1.1);
  border-bottom-color:rgba(66,51,29,.22);
  box-shadow:0 6px 24px rgba(36,26,12,.10);
}
.brand{display:flex;align-items:center;gap:12px;font-family:var(--display);font-size:24px;letter-spacing:.01em}
.brand__mark{width:30px;height:30px;flex:none}
.brand__mark .nbox{transform-origin:50% 50%}
.nav__links{display:flex;align-items:center;gap:6px;position:relative}
.nav__link{
  font-family:var(--mono);font-size:12px;letter-spacing:.14em;text-transform:uppercase;
  padding:.6em .9em;color:var(--sepia);position:relative;transition:color .3s var(--ease);
}
.nav__link:hover,.nav__link[aria-current="page"]{color:var(--ink)}
.nav__underline{
  position:absolute;bottom:2px;height:2px;
  background:linear-gradient(90deg,var(--gilt-deep),var(--gilt),var(--gilt-deep));
  border-radius:2px;left:0;width:0;opacity:0;
  transition:left .4s var(--ease),width .4s var(--ease),opacity .3s var(--ease);
  pointer-events:none;
}
.nav__cta{display:flex;align-items:center;gap:10px}

/* burger */
.burger{display:none;width:42px;height:42px;border:1px solid var(--sepia);border-radius:3px;
  align-items:center;justify-content:center;background:linear-gradient(180deg,var(--card),var(--card-deep))}
.burger span{display:block;width:18px;height:1.5px;background:var(--ink);position:relative;transition:.35s var(--ease)}
.burger span::before,.burger span::after{content:"";position:absolute;left:0;width:18px;height:1.5px;background:var(--ink);transition:.35s var(--ease)}
.burger span::before{top:-6px}.burger span::after{top:6px}
.burger.is-open span{background:transparent}
.burger.is-open span::before{top:0;transform:rotate(45deg)}
.burger.is-open span::after{top:0;transform:rotate(-45deg)}

/* mobile sheet */
.scrim{position:fixed;inset:0;background:rgba(36,19,8,.5);opacity:0;pointer-events:none;
  z-index:60;transition:opacity .4s var(--ease)}
.scrim.is-open{opacity:1;pointer-events:auto}
.sheet{position:fixed;top:0;right:0;bottom:0;width:min(86vw,360px);z-index:61;
  background:linear-gradient(160deg,var(--card),var(--vellum-deep));
  border-left:1px solid var(--sepia);box-shadow:-30px 0 60px rgba(36,26,12,.3);
  transform:translateX(100%);transition:transform .5s var(--ease);
  padding:90px 32px 32px;display:flex;flex-direction:column;gap:4px}
.sheet.is-open{transform:translateX(0)}
.sheet::before{content:"";position:absolute;inset:8px;border:1px solid var(--gilt);opacity:.4;pointer-events:none}
.sheet a{font-family:var(--display);font-size:26px;padding:.35em 0;border-bottom:1px solid rgba(66,51,29,.18)}
.sheet a .label{display:block;font-size:10px;margin-bottom:-4px}

/* ---- Footer ------------------------------------------------ */
.foot{background:linear-gradient(180deg,var(--mahog-2),var(--mahog));color:var(--lt);
  border-top:2px solid rgba(255,255,255,.18)}
.foot a{color:var(--lt-soft)}
.foot a:hover{color:var(--gilt-pale)}
.foot .label{color:var(--ond)}
.foot p,.foot .muted{color:var(--lt-soft)}
.foot__grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px;padding-block:64px}
.foot__col h4{font-family:var(--mono);font-size:11px;letter-spacing:.24em;text-transform:uppercase;color:var(--gilt);margin-bottom:16px}
.foot__col a{display:block;padding:.28em 0;font-size:16px}
.foot__bar{display:flex;justify-content:space-between;align-items:center;gap:16px;
  padding-block:22px;border-top:1px solid rgba(231,207,148,.22);font-size:13px;color:var(--lt-soft);flex-wrap:wrap}

/* ---- Scroll reveal -----------------------------------------
   Safe default = visible. Hidden initial state only applies when
   <html> has .anim (added in <head>, removed if the environment
   can't actually run CSS transitions — so content never gets
   stuck invisible). */
.reveal{opacity:1;transform:none}
html.anim .reveal{opacity:0;transform:translateY(22px);
  transition:opacity .8s var(--ease),transform .8s var(--ease)}
html.anim .reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  html.anim .reveal{opacity:1;transform:none;transition:none}
}

/* ---- Dots (frontier / live) -------------------------------- */
.dot{display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--gilt);position:relative}
.dot::after{content:"";position:absolute;inset:-4px;border-radius:50%;border:1px solid currentColor;
  color:var(--gilt);animation:pulse 2.4s var(--ease) infinite}
.dot--live{background:var(--wax)}.dot--live::after{color:var(--wax)}
@keyframes pulse{0%{transform:scale(.6);opacity:.9}70%,100%{transform:scale(1.8);opacity:0}}
@media (prefers-reduced-motion:reduce){.dot::after{animation:none;opacity:0}}

/* ---- Wax seal ---------------------------------------------- */
.seal{width:96px;height:96px;border-radius:50%;display:grid;place-items:center;flex:none;
  background:radial-gradient(circle at 38% 32%,color-mix(in srgb,var(--wax) 55%,#fff),var(--wax) 52%,color-mix(in srgb,var(--wax) 60%,#000));
  box-shadow:0 6px 16px rgba(0,0,0,.35),inset 0 2px 6px rgba(255,255,255,.18),inset 0 -8px 14px rgba(0,0,0,.35);
  color:var(--lt);font-family:var(--display);font-size:30px;position:relative}
.seal::before{content:"";position:absolute;inset:8px;border:1px dashed rgba(243,217,200,.4);border-radius:50%}

/* ---- Utility ----------------------------------------------- */
.center{text-align:center}
.muted{color:var(--sepia-soft)}
.grid{display:grid;gap:clamp(16px,2vw,26px)}
.flow>*+*{margin-top:1.1em}
.hr-hair{height:1px;background:linear-gradient(90deg,transparent,rgba(66,51,29,.4),transparent);border:0}
.tag{display:inline-flex;align-items:center;gap:.5em;font-family:var(--mono);font-size:11px;
  letter-spacing:.16em;text-transform:uppercase;color:var(--sepia);
  border:1px solid rgba(66,51,29,.4);border-radius:2px;padding:.4em .7em;background:rgba(255,255,255,.18)}

/* dark section base */
.on-dark{background:linear-gradient(180deg,var(--mahog-2),var(--mahog));color:var(--lt)}
.on-dark .label,.on-dark .eyebrow{color:var(--ond)}
.on-dark .eyebrow::before{background:var(--ond)}
.on-dark .lede,.on-dark .muted{color:var(--lt-soft)}
.on-dark .plate{background:linear-gradient(180deg,rgba(255,255,255,.07),rgba(255,255,255,.02));border-color:rgba(255,255,255,.16);color:var(--lt)}
.on-dark .plate::before{border-color:var(--gilt-deep);opacity:.5}
.on-dark .plate p{color:var(--lt-soft)}

/* on sea-green section */
.on-sea{background:linear-gradient(180deg,var(--sea),var(--sea-deep));color:#eaf2ee}
.on-sea .label,.on-sea .eyebrow{color:var(--ond)}
.on-sea .eyebrow::before{background:var(--ond)}
.on-sea .lede,.on-sea p{color:#eef4f1}
.on-sea .muted{color:#cfe0d9}

/* responsive */
@media (max-width:880px){
  body{font-size:18px}
  .nav__links,.nav__cta .btn--gilt{display:none}
  .burger{display:flex}
  .foot__grid{grid-template-columns:1fr 1fr;gap:28px}
}

/* ---- Tweaks panel (brass instrument) ---------------------- */
#tweaks-panel{
  position:fixed;right:20px;bottom:20px;z-index:80;width:min(92vw,330px);
  background:linear-gradient(180deg,var(--card),var(--card-deep));
  border:1px solid var(--sepia);border-radius:4px;
  box-shadow:var(--lift-2);color:var(--ink);
  opacity:0;transform:translateY(14px) scale(.98);pointer-events:none;
  transition:opacity .3s var(--ease),transform .3s var(--ease);
  font-family:var(--body);overflow:hidden;
}
#tweaks-panel.is-open{opacity:1;transform:none;pointer-events:auto}
#tweaks-panel::before{content:"";position:absolute;inset:5px;border:1px solid var(--gilt);opacity:.5;border-radius:2px;pointer-events:none}
.tw__head{display:flex;align-items:center;justify-content:space-between;
  padding:13px 16px;border-bottom:1px solid rgba(66,51,29,.3);
  background:linear-gradient(180deg,rgba(200,164,78,.16),transparent)}
.tw__title{font-family:var(--display);font-size:21px;line-height:1}
.tw__x{font-size:24px;line-height:1;color:var(--sepia-soft);width:28px;height:28px;border-radius:3px}
.tw__x:hover{color:var(--ink);background:rgba(66,51,29,.1)}
.tw__body{padding:16px;max-height:min(70vh,560px);overflow-y:auto}
.tw__sec+.tw__sec{margin-top:18px}
.tw__lbl{display:block;font-family:var(--mono);font-size:11px;letter-spacing:.24em;text-transform:uppercase;color:var(--gilt-deep)}
.tw__hint{display:block;font-size:13px;color:var(--sepia-soft);margin:2px 0 12px}
.tw__list{display:flex;flex-direction:column;gap:8px}
.tw__opt{display:flex;align-items:center;gap:12px;width:100%;text-align:left;
  padding:10px 11px;border:1px solid rgba(66,51,29,.32);border-radius:3px;
  background:rgba(255,255,255,.12);transition:border-color .25s var(--ease),background .25s var(--ease),transform .25s var(--ease)}
.tw__opt:hover{transform:translateX(2px);background:rgba(255,255,255,.22)}
.tw__opt.is-on{border-color:var(--gilt-deep);background:rgba(200,164,78,.16);box-shadow:0 0 0 1px var(--gilt) inset}
.tw__sw{display:flex;flex:none;border-radius:3px;overflow:hidden;border:1px solid rgba(36,26,12,.35);box-shadow:0 1px 3px rgba(36,26,12,.25)}
.tw__sw i{display:block;width:15px;height:34px}
.tw__meta{display:flex;flex-direction:column;gap:1px;flex:1;min-width:0}
.tw__name{font-family:var(--display);font-size:18px;line-height:1.05}
.tw__note{font-size:12px;color:var(--sepia-soft);line-height:1.3}
.tw__tick{width:16px;height:16px;border-radius:50%;flex:none;border:1px solid rgba(66,51,29,.4);position:relative}
.tw__opt.is-on .tw__tick{border-color:var(--gilt-deep);background:var(--gilt)}
.tw__opt.is-on .tw__tick::after{content:"";position:absolute;left:5px;top:2px;width:4px;height:8px;border:solid #2a200a;border-width:0 1.5px 1.5px 0;transform:rotate(45deg)}

/* ---- Page hero (interior pages) --------------------------- */
.phero{padding-top:clamp(120px,16vh,180px);padding-bottom:clamp(36px,5vw,64px)}
.phero__in{max-width:60ch}
.phero h1.display{font-size:clamp(40px,6vw,76px);margin-top:.6rem}
.phero .lede{margin-top:1.2rem}

/* ---- FAQ accordion ---------------------------------------- */
.acc{border-top:1px solid rgba(127,127,127,.28)}
.acc__item{border-bottom:1px solid rgba(127,127,127,.28)}
.acc__q{display:flex;align-items:center;gap:18px;width:100%;text-align:left;
  padding:24px 8px;font-family:var(--display);font-size:clamp(20px,2.2vw,27px);line-height:1.2;color:var(--ink)}
.acc__q:hover{color:var(--sepia)}
.acc__mk{flex:none;width:30px;height:30px;border:1px solid var(--gilt-deep);border-radius:50%;
  display:grid;place-items:center;position:relative;transition:transform .4s var(--ease),background .4s var(--ease)}
.acc__mk::before,.acc__mk::after{content:"";position:absolute;background:var(--gilt-deep);transition:opacity .3s var(--ease)}
.acc__mk::before{width:12px;height:1.5px}
.acc__mk::after{width:1.5px;height:12px}
.acc__item.is-open .acc__mk{transform:rotate(135deg);background:var(--gilt);border-color:var(--gilt)}
.acc__item.is-open .acc__mk::before,.acc__item.is-open .acc__mk::after{background:var(--ink)}
.acc__q .acc__txt{flex:1}
.acc__a{max-height:0;overflow:hidden;transition:max-height .5s var(--ease)}
.acc__a-in{padding:0 8px 26px 60px;color:var(--sepia);font-size:17px}
.acc__a-in p+p{margin-top:.8em}

/* ---- Callout band ----------------------------------------- */
.callout{padding-block:clamp(48px,7vw,96px)}
.callout__in{max-width:60ch;margin-inline:auto;text-align:center}
.callout h2.display{margin:1rem 0}

/* ---- Editorial steps (alternating) ------------------------ */
.steps{display:flex;flex-direction:column;gap:clamp(48px,8vw,120px)}
.step{display:grid;grid-template-columns:1fr 1fr;gap:clamp(28px,5vw,72px);align-items:center}
.step:nth-child(even) .step__art{order:2}
.step__n{font-family:var(--mono);font-size:13px;letter-spacing:.24em;color:var(--gilt-deep);text-transform:uppercase}
.step h2{font-family:var(--display);font-size:clamp(28px,3.4vw,44px);line-height:1.06;margin:.5rem 0 1rem}
.step p{color:var(--sepia);font-size:18px}
.step__art{position:relative;aspect-ratio:4/3;border:1px solid var(--sepia);border-radius:3px;
  background:linear-gradient(180deg,var(--card),var(--card-deep));box-shadow:var(--lift-1);overflow:hidden}
.step__art::before{content:"";position:absolute;inset:7px;border:1px solid var(--gilt);opacity:.5;border-radius:2px;pointer-events:none;z-index:2}
@media (max-width:840px){
  .step{grid-template-columns:1fr;gap:24px}
  .step:nth-child(even) .step__art{order:0}
  .acc__a-in{padding-left:8px}
}