/* ---------- tokens: light (cold-rolled steel workshop) ---------- */
:root {
  --ground:   #E9E5E0;
  --surface:  #FBF9F7;
  --sunken:   #DFD9D2;
  --line:     #CBC2B9;
  --ink:      #191310;
  --ink-2:    #4A403A;
  --muted:    #6F635B;

  --ember:    #8A2410;
  --forge:    #C2400F;
  --amber:    #B4711A;
  --gold:     #8A6512;
  --steel:    #47657A;

  --shadow:   0 1px 2px rgba(25,19,16,.06), 0 8px 24px -12px rgba(25,19,16,.18);
  --maxw:     1180px;
  --radius:   3px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ground:  #14100E;
    --surface: #1D1815;
    --sunken:  #0E0B0A;
    --line:    #352C26;
    --ink:     #F2ECE6;
    --ink-2:   #C9BDB4;
    --muted:   #9C8E85;

    --ember:   #7A1F0E;
    --forge:   #E4551A;
    --amber:   #F59A2E;
    --gold:    #FFD98A;
    --steel:   #7E9BB0;

    --shadow:  0 1px 2px rgba(0,0,0,.5), 0 18px 40px -18px rgba(0,0,0,.7);
  }
}
:root[data-theme="dark"] {
  --ground:  #14100E;
  --surface: #1D1815;
  --sunken:  #0E0B0A;
  --line:    #352C26;
  --ink:     #F2ECE6;
  --ink-2:   #C9BDB4;
  --muted:   #9C8E85;

  --ember:   #7A1F0E;
  --forge:   #E4551A;
  --amber:   #F59A2E;
  --gold:    #FFD98A;
  --steel:   #7E9BB0;

  --shadow:  0 1px 2px rgba(0,0,0,.5), 0 18px 40px -18px rgba(0,0,0,.7);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font-family: "IBM Plex Sans", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, .display {
  font-family: "Big Shoulders Display", "Arial Narrow", Impact, sans-serif;
  font-weight: 800;
  line-height: .92;
  letter-spacing: -0.005em;
  text-wrap: balance;
  margin: 0;
}

p { margin: 0; }
a { color: inherit; }

.wrap { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: 28px; }

.eyebrow {
  font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .16em;
  text-transform: uppercase;
}

/* ---------- forge hero: deliberately single-world, always dark ---------- */
.forge {
  position: relative;
  background: #14100E;
  color: #F2ECE6;
  overflow: hidden;
  isolation: isolate;
}
.forge::after {
  content: "";
  position: absolute;
  inset: auto 0 -1px 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, #E4551A, #FFD98A, #E4551A, transparent);
  opacity: .5;
}
#embers {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}
.forge > .wrap { position: relative; z-index: 1; }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding-block: 22px;
  border-bottom: 1px solid rgba(242,236,230,.10);
}
.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  font-family: "Big Shoulders Display", sans-serif;
  font-weight: 800;
  font-size: 27px;
  letter-spacing: .01em;
  text-decoration: none;
}
.brand .anvil { width: 26px; height: 26px; display: block; }
.nav { display: flex; gap: 26px; align-items: center; }
.nav a {
  text-decoration: none;
  font-size: 14px;
  color: rgba(242,236,230,.72);
  padding-block: 4px;
  border-bottom: 1px solid transparent;
  transition: color .18s, border-color .18s;
}
.nav a:hover, .nav a:focus-visible { color: #FFD98A; border-bottom-color: #E4551A; }
@media (max-width: 820px) { .nav { display: none; } }

.hero { padding-block: clamp(70px, 11vw, 132px) clamp(60px, 9vw, 104px); }
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, .85fr);
  gap: clamp(34px, 6vw, 76px);
  align-items: end;
}
@media (max-width: 900px) { .hero-grid { grid-template-columns: 1fr; align-items: start; } }

.hero h1 {
  font-size: clamp(60px, 12.5vw, 158px);
  margin-block: 20px 0;
}
.hero h1 .hot {
  background: linear-gradient(96deg, #7A1F0E 0%, #E4551A 34%, #F59A2E 62%, #FFD98A 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero .lede {
  margin-top: 26px;
  font-size: clamp(17px, 2vw, 20px);
  line-height: 1.6;
  color: rgba(242,236,230,.80);
  max-width: 46ch;
}
.hero .eyebrow { color: #F59A2E; }

.cta-row { display: flex; flex-wrap: wrap; gap: 13px; margin-top: 34px; }
.btn {
  font-family: "IBM Plex Sans", sans-serif;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  padding: 14px 26px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  transition: transform .16s, box-shadow .16s, background .16s, border-color .16s;
}
.btn-hot {
  background: linear-gradient(180deg, #E4551A, #C2400F);
  color: #FFF6E8;
  box-shadow: 0 0 0 0 rgba(228,85,26,.5), 0 10px 26px -12px rgba(228,85,26,.9);
}
.btn-hot:hover, .btn-hot:focus-visible { transform: translateY(-2px); box-shadow: 0 0 26px -4px rgba(245,154,46,.55), 0 14px 30px -12px rgba(228,85,26,.9); }
.btn-ghost { border-color: rgba(242,236,230,.26); color: #F2ECE6; }
.btn-ghost:hover, .btn-ghost:focus-visible { border-color: #F59A2E; color: #FFD98A; }

/* temperature gauge in hero */
.gauge { border-left: 1px solid rgba(242,236,230,.14); padding-left: clamp(20px, 3vw, 34px); }
@media (max-width: 900px) { .gauge { border-left: 0; border-top: 1px solid rgba(242,236,230,.14); padding: 26px 0 0; } }
.gauge .eyebrow { color: rgba(242,236,230,.5); }
.gauge dl { margin: 18px 0 0; display: grid; gap: 15px; }
.gauge .row { display: grid; grid-template-columns: 46px 1fr; align-items: baseline; gap: 14px; }
.gauge dt {
  font-family: "IBM Plex Mono", monospace;
  font-size: 12px;
  color: #F59A2E;
  font-variant-numeric: tabular-nums;
}
.gauge dd { margin: 0; font-size: 14.5px; color: rgba(242,236,230,.78); }
.gauge dd b { color: #F2ECE6; font-weight: 600; }

/* ---------- shared section furniture ---------- */
section { padding-block: clamp(64px, 8vw, 104px); }
.sec-head { max-width: 62ch; margin-bottom: clamp(34px, 4vw, 52px); }
.sec-head .eyebrow { color: var(--forge); }
.sec-head h2 { font-size: clamp(40px, 6vw, 68px); margin-top: 14px; }
.sec-head p { margin-top: 18px; color: var(--ink-2); font-size: 17.5px; max-width: 60ch; }

/* ---------- stats strip ---------- */
.strip { background: var(--sunken); border-block: 1px solid var(--line); }
.strip .wrap { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); }
@media (max-width: 760px) { .strip .wrap { grid-template-columns: repeat(2, 1fr); } }
.stat { background: var(--sunken); padding: 30px 24px; }
.stat .n {
  font-family: "Big Shoulders Display", sans-serif;
  font-weight: 700;
  font-size: clamp(38px, 5vw, 54px);
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--forge);
}
.stat .l { margin-top: 8px; font-size: 13.5px; color: var(--muted); }

/* ---------- process: the heat scale as real sequence ---------- */
.stages { display: grid; gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.stage {
  background: var(--surface);
  padding: clamp(24px, 3vw, 34px);
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr) minmax(0, 1.15fr);
  gap: clamp(18px, 3vw, 40px);
  align-items: start;
  position: relative;
}
@media (max-width: 860px) { .stage { grid-template-columns: 1fr; gap: 12px; } }
.stage::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: var(--heat);
}
.stage .temp {
  font-family: "IBM Plex Mono", monospace;
  font-size: 12.5px;
  font-variant-numeric: tabular-nums;
  color: var(--heat);
  letter-spacing: .04em;
  padding-top: 5px;
}
.stage h3 { font-size: clamp(29px, 3.4vw, 38px); }
.stage h3 span { display: block; font-family: "IBM Plex Sans", sans-serif; font-size: 12px; font-weight: 500; letter-spacing: .16em; text-transform: uppercase; color: var(--muted); margin-bottom: 7px; }
.stage p { color: var(--ink-2); font-size: 16px; }
.stage ul { margin: 12px 0 0; padding: 0; list-style: none; display: grid; gap: 7px; }
.stage li { font-size: 14.5px; color: var(--muted); padding-left: 17px; position: relative; }
.stage li::before { content: "▸"; position: absolute; left: 0; color: var(--heat); }

/* ---------- growth / SEO-SEA panel ---------- */
.growth { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden; }
.growth-head { padding: clamp(24px, 3vw, 34px); border-bottom: 1px solid var(--line); display: flex; flex-wrap: wrap; gap: 18px; justify-content: space-between; align-items: end; }
.growth-head h3 { font-size: clamp(30px, 3.6vw, 42px); }
.legend { display: flex; gap: 20px; font-family: "IBM Plex Mono", monospace; font-size: 12px; color: var(--muted); }
.legend i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; margin-right: 7px; vertical-align: baseline; }
.chartwrap { padding: clamp(20px, 3vw, 30px); overflow-x: auto; }
.chart { width: 100%; min-width: 540px; height: 260px; display: block; }
.chart text { font-family: "IBM Plex Mono", monospace; font-size: 11px; fill: var(--muted); }
.chart .grid line { stroke: var(--line); stroke-width: 1; }

.split { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 1px; background: var(--line); border-top: 1px solid var(--line); }
@media (max-width: 760px) { .split { grid-template-columns: 1fr; } }
.cell { background: var(--surface); padding: clamp(22px, 3vw, 30px); }
.cell h4 { margin: 0 0 12px; font-family: "IBM Plex Sans", sans-serif; font-size: 14px; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); font-weight: 600; }
.cell ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 11px; }
.cell li { display: grid; grid-template-columns: 20px 1fr; gap: 11px; font-size: 15px; color: var(--ink-2); }
.cell li svg { margin-top: 4px; }

/* ---------- services ---------- */
.cards { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 20px; }
@media (max-width: 900px) { .cards { grid-template-columns: 1fr; } }
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(24px, 3vw, 32px);
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: border-color .18s, transform .18s;
}
.card:hover { border-color: var(--forge); transform: translateY(-3px); }
.card .k { font-family: "IBM Plex Mono", monospace; font-size: 12px; letter-spacing: .12em; text-transform: uppercase; color: var(--forge); }
.card h3 { font-size: clamp(28px, 3vw, 34px); }
.card p { color: var(--ink-2); font-size: 15.5px; }
.card .price { margin-top: auto; padding-top: 14px; border-top: 1px solid var(--line); font-family: "IBM Plex Mono", monospace; font-size: 13.5px; color: var(--muted); }

/* ---------- faq ---------- */
.faq { display: grid; gap: 1px; background: var(--line); border-block: 1px solid var(--line); }
details { background: var(--surface); }
summary {
  cursor: pointer;
  list-style: none;
  padding: 22px clamp(18px, 3vw, 28px);
  font-weight: 600;
  font-size: 17px;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: center;
}
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; font-family: "IBM Plex Mono", monospace; color: var(--forge); font-size: 20px; line-height: 1; }
details[open] summary::after { content: "–"; }
details p { padding: 0 clamp(18px, 3vw, 28px) 24px; color: var(--ink-2); max-width: 68ch; }

/* ---------- closing ---------- */
.close { background: var(--sunken); border-top: 1px solid var(--line); }
.close .wrap { display: grid; grid-template-columns: minmax(0,1.2fr) minmax(0,.8fr); gap: clamp(28px, 5vw, 60px); align-items: center; }
@media (max-width: 860px) { .close .wrap { grid-template-columns: 1fr; } }
.close h2 { font-size: clamp(42px, 6.5vw, 76px); }
.close p { color: var(--ink-2); margin-top: 16px; max-width: 46ch; }

footer { border-top: 1px solid var(--line); padding-block: 34px; color: var(--muted); font-size: 14px; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 18px; justify-content: space-between; align-items: center; }
footer a { color: var(--muted); text-decoration: none; }
footer a:hover, footer a:focus-visible { color: var(--forge); }

:focus-visible { outline: 2px solid var(--forge); outline-offset: 3px; }

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}