/* ============================================================
   stoveLogic — shared design system
   Rugged craftsman / precision-instrument
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Spectral:ital,wght@0,300;0,400;0,500;0,600;0,700;0,800;1,400&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

/* ---------- Tokens ---------- */
:root{
  /* warm dark */
  --ink:        oklch(0.165 0.012 60);
  --ink-1:      oklch(0.205 0.013 60);
  --ink-2:      oklch(0.255 0.014 62);
  --ink-3:      oklch(0.34 0.014 64);

  /* warm paper */
  --paper:      oklch(0.948 0.011 74);
  --paper-1:    oklch(0.912 0.013 74);
  --paper-2:    oklch(0.872 0.015 72);

  /* accents */
  --amber:      oklch(0.70 0.155 52);
  --amber-hi:   oklch(0.80 0.165 62);
  --ember:      oklch(0.61 0.17 38);
  --blue:       oklch(0.60 0.115 248);
  --blue-hi:    oklch(0.72 0.13 244);

  /* text on dark / light */
  --on-dark:    oklch(0.93 0.008 75);
  --on-dark-dim:oklch(0.74 0.01 72);
  --on-light:   oklch(0.22 0.012 60);
  --on-light-dim:oklch(0.42 0.012 62);

  --line-dark:  oklch(0.40 0.012 64 / 0.40);
  --line-light: oklch(0.30 0.012 60 / 0.18);

  --font-display:'Spectral', Georgia, 'Times New Roman', serif;
  --font-body:   'Spectral', Georgia, serif;
  --font-mono:   'JetBrains Mono', ui-monospace, monospace;

  --maxw: 1200px;
  --gutter: clamp(20px, 5vw, 64px);

  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.25);
  --shadow-md: 0 18px 50px -24px oklch(0 0 0 / 0.55);
  --shadow-lg: 0 40px 90px -40px oklch(0 0 0 / 0.7);
}

/* ---------- Reset ---------- */
*{ box-sizing:border-box; margin:0; padding:0; }
html{ scroll-behavior:smooth; -webkit-text-size-adjust:100%; }
body{
  font-family:var(--font-body);
  background:var(--paper);
  color:var(--on-light);
  font-size:18px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img{ display:block; max-width:100%; }
a{ color:inherit; text-decoration:none; }
button{ font-family:inherit; cursor:pointer; }

/* subtle paper grain on light sections */
.grain{ position:relative; }
.grain::after{
  content:""; position:absolute; inset:0; pointer-events:none; z-index:0;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.5'/%3E%3C/svg%3E");
  opacity:0.04; mix-blend-mode:multiply;
}
.grain > *{ position:relative; z-index:1; }
.section.dark.grain::after{ mix-blend-mode:overlay; opacity:0.05; }

/* ---------- Layout ---------- */
.wrap{ width:100%; max-width:var(--maxw); margin-inline:auto; padding-inline:var(--gutter); }
.section{ padding-block:clamp(64px,9vw,128px); position:relative; }
.section.dark{ background:var(--ink); color:var(--on-dark); }
.section.ink1{ background:var(--ink-1); color:var(--on-dark); }
.section.paper1{ background:var(--paper-1); }
.section.tight{ padding-block:clamp(48px,6vw,80px); }

/* ---------- Type ---------- */
h1,h2,h3,h4{ font-family:var(--font-display); font-weight:700; line-height:1.04; letter-spacing:-0.01em; }
.display{ font-size:clamp(40px,6.6vw,86px); font-weight:800; line-height:0.98; letter-spacing:-0.022em; }
.h1{ font-size:clamp(34px,5vw,62px); font-weight:800; letter-spacing:-0.02em; }
.h2{ font-size:clamp(28px,3.6vw,46px); font-weight:700; letter-spacing:-0.015em; }
.h3{ font-size:clamp(21px,2.1vw,28px); font-weight:700; }
.lead{ font-size:clamp(20px,1.6vw,24px); line-height:1.55; }
.measure{ max-width:64ch; }
.measure-sm{ max-width:50ch; }
.dim{ color:var(--on-light-dim); }
.section.dark .dim, .section.ink1 .dim{ color:var(--on-dark-dim); }
.serif-it{ font-style:italic; }

/* eyebrow / kicker */
.eyebrow{
  font-family:var(--font-mono); font-weight:600;
  font-size:12px; letter-spacing:0.26em; text-transform:uppercase;
  color:var(--amber); display:inline-flex; align-items:center; gap:10px;
}
.eyebrow::before{ content:""; width:26px; height:1px; background:currentColor; opacity:0.7; }
.eyebrow.center::after{ content:""; width:26px; height:1px; background:currentColor; opacity:0.7; }
.eyebrow.blue{ color:var(--blue-hi); }
.eyebrow.ink{ color:var(--ink-3); }

.mono-label{ font-family:var(--font-mono); font-size:12px; letter-spacing:0.14em; text-transform:uppercase; }

/* rules */
.rule{ height:1px; background:var(--line-light); border:0; }
.section.dark .rule, .section.ink1 .rule{ background:var(--line-dark); }
.rule-double{ border:0; border-top:1px solid var(--line-light); border-bottom:1px solid var(--line-light); height:4px; }

/* ---------- Buttons ---------- */
.btn{
  --bg:var(--amber); --fg:var(--ink);
  display:inline-flex; align-items:center; gap:10px;
  font-family:var(--font-mono); font-weight:600; font-size:13.5px;
  letter-spacing:0.1em; text-transform:uppercase;
  background:var(--bg); color:var(--fg);
  padding:15px 26px; border:1px solid transparent; border-radius:2px;
  transition:transform .18s ease, box-shadow .18s ease, background .18s ease;
  box-shadow:var(--shadow-sm);
}
.btn:hover{ transform:translateY(-2px); box-shadow:var(--shadow-md); }
.btn:active{ transform:translateY(0); }
.btn .arr{ transition:transform .18s ease; }
.btn:hover .arr{ transform:translateX(3px); }
.btn.amber{ --bg:var(--amber); --fg:oklch(0.18 0.02 50); }
.btn.amber:hover{ --bg:var(--amber-hi); }
.btn.ghost{ --bg:transparent; --fg:var(--on-dark); border-color:var(--line-dark); box-shadow:none; }
.btn.ghost:hover{ background:oklch(1 0 0 / 0.06); }
.btn.ghost-ink{ --bg:transparent; --fg:var(--ink); border-color:var(--line-light); box-shadow:none; }
.btn.ghost-ink:hover{ background:oklch(0 0 0 / 0.04); }
.btn.lg{ padding:18px 32px; font-size:14px; }
.btn[disabled]{ cursor:default; opacity:0.9; }
.btn[disabled]:hover{ transform:none; box-shadow:var(--shadow-sm); }

.linkarrow{ font-family:var(--font-mono); font-size:13px; letter-spacing:0.08em; text-transform:uppercase;
  display:inline-flex; gap:8px; align-items:center; border-bottom:1px solid currentColor; padding-bottom:3px; }
.linkarrow:hover{ gap:12px; }

/* ---------- Nav ---------- */
.nav{
  position:sticky; top:0; z-index:60;
  background:oklch(0.165 0.012 60 / 0.86); backdrop-filter:blur(12px) saturate(1.2);
  border-bottom:1px solid var(--line-dark);
  color:var(--on-dark);
}
.nav-inner{ display:flex; align-items:center; justify-content:space-between; gap:24px; height:68px; }
.brand{ display:flex; align-items:baseline; gap:0; font-family:var(--font-display); font-weight:800; font-size:23px; letter-spacing:-0.02em; }
.brand b{ color:var(--on-dark); font-weight:800; }
.brand .lo{ color:var(--on-dark); }
.brand .hi{ color:var(--amber); }
.brand .dot{ display:inline-block; width:6px; height:6px; border-radius:50%; background:var(--blue-hi); margin-left:8px; align-self:center; box-shadow:0 0 10px var(--blue-hi); }
.nav-links{ display:flex; gap:30px; font-family:var(--font-mono); font-size:12.5px; letter-spacing:0.1em; text-transform:uppercase; }
.nav-links a{ color:var(--on-dark-dim); padding-block:6px; position:relative; transition:color .15s; }
.nav-links a:hover{ color:var(--on-dark); }
.nav-links a.active{ color:var(--on-dark); }
.nav-links a.active::after{ content:""; position:absolute; left:0; right:0; bottom:-2px; height:2px; background:var(--amber); }
.nav .btn{ padding:11px 18px; font-size:11.5px; }
.nav-toggle{ display:none; background:none; border:0; color:var(--on-dark); }
@media (max-width:880px){
  .nav-links{
    display:none; position:absolute; top:68px; left:0; right:0;
    flex-direction:column; gap:0; background:var(--ink-1); border-bottom:1px solid var(--line-dark);
    padding:8px var(--gutter) 18px;
  }
  .nav-links.open{ display:flex; }
  .nav-links a{ padding:13px 0; border-bottom:1px solid var(--line-dark); }
  .nav-links a.active::after{ display:none; }
  .nav-toggle{ display:inline-flex; align-items:center; gap:9px; font-family:var(--font-mono); font-size:12px; letter-spacing:0.12em; text-transform:uppercase; }
  .nav-inner > .btn{ display:none; }
}

/* ---------- Craftsman seal ---------- */
.seal{
  width:var(--sz,116px); height:var(--sz,116px); border-radius:50%;
  position:relative; flex:none;
  border:2px solid currentColor; color:var(--ink);
  display:grid; place-items:center; text-align:center;
}
.seal::before{ content:""; position:absolute; inset:7px; border-radius:50%; border:1px solid currentColor; opacity:0.55; }
.seal .seal-core{ display:flex; flex-direction:column; align-items:center; gap:2px; }
.seal .seal-mk{ font-family:var(--font-display); font-weight:800; font-size:calc(var(--sz,116px)*0.2); line-height:1; letter-spacing:-0.02em; }
.seal .seal-sub{ font-family:var(--font-mono); font-size:calc(var(--sz,116px)*0.072); letter-spacing:0.18em; text-transform:uppercase; opacity:0.8; }
.seal .seal-ring{ position:absolute; inset:0; }
.seal.on-dark{ color:var(--on-dark); }
.seal.blue{ color:var(--blue-hi); }

/* curved seal text */
.seal-curve{ position:absolute; inset:0; width:100%; height:100%; }
.seal-curve text{ font-family:var(--font-mono); font-size:8.2px; letter-spacing:0.28em; text-transform:uppercase; fill:currentColor; }

/* small badge / chip */
.chip{
  font-family:var(--font-mono); font-size:11px; letter-spacing:0.16em; text-transform:uppercase;
  border:1px solid var(--line-light); border-radius:2px; padding:6px 11px; display:inline-flex; gap:8px; align-items:center;
}
.section.dark .chip, .section.ink1 .chip{ border-color:var(--line-dark); color:var(--on-dark-dim); }
.chip .led{ width:7px; height:7px; border-radius:50%; }
.led.green{ background:oklch(0.78 0.17 145); box-shadow:0 0 8px oklch(0.78 0.17 145); }
.led.amber{ background:var(--amber-hi); box-shadow:0 0 8px var(--amber-hi); }
.led.red{ background:oklch(0.62 0.2 28); box-shadow:0 0 8px oklch(0.62 0.2 28); }
.led.blue{ background:var(--blue-hi); box-shadow:0 0 10px var(--blue-hi); }

/* ---------- Image placeholder slot ---------- */
.ph{
  position:relative; border:1px solid var(--line-dark); border-radius:3px; overflow:hidden;
  background:
    repeating-linear-gradient(135deg, oklch(0.24 0.014 62) 0 14px, oklch(0.215 0.013 60) 14px 28px);
  color:var(--on-dark-dim);
  display:flex; flex-direction:column; align-items:center; justify-content:center; gap:10px;
  min-height:240px; padding:28px; text-align:center;
}
.ph.light{
  background:repeating-linear-gradient(135deg, var(--paper-2) 0 14px, var(--paper-1) 14px 28px);
  border-color:var(--line-light); color:var(--on-light-dim);
}
.ph .ph-tag{ font-family:var(--font-mono); font-size:11px; letter-spacing:0.2em; text-transform:uppercase; opacity:0.7; }
.ph .ph-name{ font-family:var(--font-mono); font-size:13.5px; letter-spacing:0.04em; max-width:30ch; }
.ph .ph-ic{ width:30px; height:30px; border:1px solid currentColor; border-radius:50%; display:grid; place-items:center; font-size:13px; opacity:0.7; }

/* photo frame */
.frame{ position:relative; border:1px solid var(--line-dark); border-radius:3px; overflow:hidden; box-shadow:var(--shadow-md); }
.frame img{ width:100%; height:100%; object-fit:cover; }
.frame .disclaimer{
  position:absolute; left:0; bottom:0; right:0; padding:8px 12px;
  font-family:var(--font-mono); font-size:10px; letter-spacing:0.08em; text-transform:uppercase;
  color:var(--on-dark-dim); background:linear-gradient(transparent, oklch(0 0 0 / 0.7));
}

/* ---------- Grids / utilities ---------- */
.grid{ display:grid; gap:clamp(24px,3vw,40px); }
.g2{ grid-template-columns:repeat(2,1fr); }
.g3{ grid-template-columns:repeat(3,1fr); }
.g4{ grid-template-columns:repeat(4,1fr); }
.stack{ display:flex; flex-direction:column; }
.row{ display:flex; }
.center{ text-align:center; }
.items-center{ align-items:center; }
.justify-center{ justify-content:center; }
.gap-s{ gap:12px; } .gap-m{ gap:20px; } .gap-l{ gap:32px; }
.flexwrap{ flex-wrap:wrap; }
.mt-s{ margin-top:14px; } .mt-m{ margin-top:24px; } .mt-l{ margin-top:40px; } .mt-xl{ margin-top:64px; }
@media (max-width:860px){ .g2,.g3,.g4{ grid-template-columns:1fr; } .g4.keep2,.g3.keep2{ grid-template-columns:repeat(2,1fr); } }
@media (max-width:560px){ .g4.keep2,.g3.keep2{ grid-template-columns:1fr; } }

/* numbered stat / spec */
.bignum{ font-family:var(--font-display); font-weight:300; font-size:clamp(48px,6vw,88px); line-height:1; letter-spacing:-0.03em; }
.bignum .u{ font-family:var(--font-mono); font-size:0.28em; letter-spacing:0.1em; vertical-align:super; color:var(--amber); font-weight:600; }

/* benefit / feature card */
.card{
  border:1px solid var(--line-light); border-radius:3px; padding:clamp(24px,3vw,36px);
  background:var(--paper); position:relative; transition:transform .2s ease, box-shadow .2s ease, border-color .2s;
}
.section.dark .card, .section.ink1 .card{ background:var(--ink-1); border-color:var(--line-dark); }
.card:hover{ transform:translateY(-3px); box-shadow:var(--shadow-md); }
.card .idx{ font-family:var(--font-mono); font-size:12px; letter-spacing:0.2em; color:var(--amber); }

/* spec list */
.spec{ display:grid; grid-template-columns:1fr auto; gap:10px 20px; align-items:baseline; padding:16px 0; border-bottom:1px solid var(--line-dark); }
.section.paper1 .spec, body .spec.on-light{ border-color:var(--line-light); }
.spec dt{ font-family:var(--font-mono); font-size:12.5px; letter-spacing:0.08em; text-transform:uppercase; color:var(--on-dark-dim); }
.spec dd{ font-family:var(--font-display); font-size:18px; text-align:right; }

/* footer */
.foot{ background:var(--ink); color:var(--on-dark); padding-block:64px 32px; border-top:1px solid var(--line-dark); }
.foot a{ color:var(--on-dark-dim); transition:color .15s; }
.foot a:hover{ color:var(--on-dark); }
.foot .disc{ font-family:var(--font-mono); font-size:11px; letter-spacing:0.04em; color:var(--on-dark-dim); line-height:1.8; }
.foot-cols{ display:grid; grid-template-columns:1.4fr 1fr 1fr; gap:40px; }
@media (max-width:760px){ .foot-cols{ grid-template-columns:1fr; gap:32px; } }

/* fade-in on scroll */
@media (prefers-reduced-motion:no-preference){
  .reveal{ opacity:0; transform:translateY(18px); transition:opacity .7s cubic-bezier(.2,.7,.2,1), transform .7s cubic-bezier(.2,.7,.2,1); }
  .reveal.in{ opacity:1; transform:none; }
}

/* breathing blue led */
@media (prefers-reduced-motion:no-preference){
  @keyframes breathe{ 0%,100%{ opacity:0.55; box-shadow:0 0 8px 0 currentColor; } 50%{ opacity:1; box-shadow:0 0 16px 3px currentColor; } }
  .breathe{ animation:breathe 3.4s ease-in-out infinite; }
}