/* FusionLogic: the AI Foundry.
   Layout concept: a foundry spec sheet. Steel-grey ground, one cobalt accent, mono "spec" labels,
   the five layers shown as a cast cross-section. Content in a 72rem frame, prose kept near 65ch. */

:root {
  --bg: #f2f4f7;          /* steel, a touch cool */
  --surface: #ffffff;
  --ink: #12161d;
  --ink-2: #4a5361;
  --rule: #d5dae2;
  --accent: #2459e6;      /* cobalt, the FusionLogic blue */
  --accent-ink: #ffffff;
  --accent-soft: #e3eafc;
  --pour: #e0702a;        /* molten metal: used once per page, on the pour line */

  --display: "Bricolage Grotesque", "Avenir Next", "Segoe UI", system-ui, sans-serif;
  --body: "IBM Plex Sans", "Segoe UI", system-ui, -apple-system, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;

  --step--1: 0.875rem;
  --step-0: 1.0625rem;
  --step-1: 1.3rem;
  --step-2: 1.7rem;
  --step-3: 2.35rem;
  --step-4: clamp(2.6rem, 6vw, 4.4rem);

  --frame: 72rem;
  --gutter-l: max(16px, env(safe-area-inset-left, 0px));
  --gutter-r: max(16px, env(safe-area-inset-right, 0px));
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1319; --surface: #171c24; --ink: #e9edf3; --ink-2: #a3adbb; --rule: #2a313c;
    --accent: #6f95ff; --accent-ink: #0b1020; --accent-soft: #1b2440; --pour: #f08a45;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0f1319; --surface: #171c24; --ink: #e9edf3; --ink-2: #a3adbb; --rule: #2a313c;
  --accent: #6f95ff; --accent-ink: #0b1020; --accent-soft: #1b2440; --pour: #f08a45;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: var(--body); font-size: var(--step-0); line-height: 1.6;
  padding-top: env(safe-area-inset-top, 0px); padding-bottom: env(safe-area-inset-bottom, 0px);
}
img, svg { max-width: 100%; }
a { color: var(--accent); text-underline-offset: 3px; }
a:focus-visible, button:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; border-radius: 4px; }
h1, h2, h3 { font-family: var(--display); line-height: 1.08; letter-spacing: -0.02em; text-wrap: balance; margin: 0; }
h1 { font-size: var(--step-4); font-weight: 700; }
h2 { font-size: var(--step-3); font-weight: 650; }
h3 { font-size: var(--step-1); font-weight: 600; letter-spacing: -0.01em; }
p { margin: 0; max-width: 65ch; }

.wrap { max-width: var(--frame); margin-inline: auto; padding-left: var(--gutter-l); padding-right: var(--gutter-r); }
.spec { font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-2); }
.lead { font-size: var(--step-1); color: var(--ink-2); line-height: 1.5; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: var(--gutter-l); top: 8px; background: var(--surface); padding: 8px 12px; z-index: 10; }

/* header */
.site-head { position: sticky; top: env(safe-area-inset-top, 0px); z-index: 5; background: var(--bg); border-bottom: 1px solid var(--rule); }
.site-head .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-block: 14px; flex-wrap: wrap; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-family: var(--display); font-weight: 700; font-size: 1.25rem; color: var(--ink); text-decoration: none; letter-spacing: -0.02em; }
.brand img { display: block; height: 30px; width: auto; }
.nav { display: flex; align-items: center; gap: 4px 18px; flex-wrap: wrap; font-size: var(--step--1); }
.nav a { color: var(--ink-2); text-decoration: none; padding: 6px 0; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--ink); }
.nav a[aria-current="page"] { box-shadow: inset 0 -2px 0 var(--accent); }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 20px; border-radius: 999px; font-weight: 600; text-decoration: none; font-size: var(--step--1); border: 1.5px solid var(--accent); transition: transform .15s ease, background .15s ease; }
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-ghost { color: var(--accent); background: transparent; }
.btn:hover { transform: translateY(-1px); }
.nav .btn { padding: 8px 16px; color: var(--accent-ink); }

/* sections */
.section { padding-block: clamp(56px, 9vw, 104px); }
.section + .section { border-top: 1px solid var(--rule); }
.stack { display: grid; gap: 20px; }
.head-row { display: grid; gap: 14px; margin-bottom: 40px; }

/* hero */
.hero { padding-block: clamp(48px, 8vw, 96px) clamp(48px, 7vw, 80px); }
.hero .wrap { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr); gap: clamp(32px, 5vw, 64px); align-items: center; }
.hero h1 em { font-style: normal; color: var(--accent); }
.hero .actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 8px; }
.pour { height: 3px; width: 96px; background: var(--pour); border-radius: 2px; }

/* cast cross-section (the five layers) */
.cast { background: var(--surface); border: 1px solid var(--rule); border-radius: 14px; padding: 18px; }
.cast ol { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.cast li { display: grid; grid-template-columns: 2.6rem minmax(0, 1fr); align-items: center; gap: 12px; padding: 12px 14px; border-radius: 10px; background: var(--bg); }
.cast li strong { font-family: var(--display); font-weight: 600; font-size: 1.05rem; display: block; }
.cast li span.sub { color: var(--ink-2); font-size: var(--step--1); }
.cast li .n { font-family: var(--mono); font-size: 0.8rem; color: var(--accent); }
.cast li:last-child { background: var(--accent-soft); }
.cast figcaption { margin-top: 12px; }

/* grids */
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.tile { background: var(--surface); border: 1px solid var(--rule); border-radius: 14px; padding: 24px; display: grid; gap: 10px; align-content: start; }
.tile p { color: var(--ink-2); }

/* layer spec sheets (What we build) */
.layer { display: grid; grid-template-columns: 12rem minmax(0, 1fr); gap: 24px 40px; padding-block: 40px; border-top: 1px solid var(--rule); }
.layer:first-of-type { border-top: 0; }
.layer .meta { display: grid; gap: 8px; align-content: start; }
.layer .meta .n { font-family: var(--mono); color: var(--accent); font-size: 0.9rem; }
.layer ul { margin: 0; padding-left: 1.1rem; display: grid; gap: 6px; max-width: 65ch; }
.yield { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 12px; align-items: baseline; margin-top: 6px; padding: 12px 16px; border-radius: 10px; background: var(--accent-soft); max-width: 65ch; }

/* steps (How we work): a real sequence, so numbered */
.steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; counter-reset: step; }
.steps li { display: grid; grid-template-columns: 4.5rem minmax(0, 1fr); gap: 20px; padding-block: 24px; border-top: 1px solid var(--rule); counter-increment: step; }
.steps li::before { content: counter(step, decimal-leading-zero); font-family: var(--mono); font-size: 1.5rem; color: var(--accent); line-height: 1.2; }
.steps li p { color: var(--ink-2); margin-top: 6px; }

/* case study */
.facts { display: flex; flex-wrap: wrap; gap: 10px; align-items: flex-start; align-content: flex-start; }
.grid-2 > .facts { align-self: center; }
.fact { font-family: var(--mono); font-size: 0.8rem; padding: 6px 12px; border: 1px solid var(--rule); border-radius: 999px; background: var(--surface); color: var(--ink-2); }
.built { display: grid; gap: 14px; margin: 0; padding: 0; list-style: none; }
.built li { display: grid; grid-template-columns: 9rem minmax(0, 1fr); gap: 16px; padding: 16px 0; border-top: 1px solid var(--rule); }
.built li b { font-family: var(--display); font-weight: 600; }
.gateway { font-family: var(--mono); font-size: 0.85rem; background: var(--surface); border: 1px solid var(--rule); border-radius: 12px; padding: 16px; display: grid; gap: 8px; overflow-x: auto; }
.gateway .ph { color: var(--accent); }

/* call to action band */
.cta-band { background: var(--ink); color: var(--bg); }
.cta-band .wrap { padding-block: clamp(48px, 7vw, 80px); display: grid; gap: 18px; justify-items: start; }
.cta-band h2 { color: var(--bg); }
.cta-band p { color: color-mix(in srgb, var(--bg) 78%, var(--ink)); }
.cta-band .btn-primary { background: var(--bg); color: var(--ink); border-color: var(--bg); }

/* contact */
.contact-card { background: var(--surface); border: 1px solid var(--rule); border-radius: 14px; padding: 28px; display: grid; gap: 12px; max-width: 40rem; }
.addr { font-family: var(--mono); font-size: var(--step-1); color: var(--ink); word-break: break-all; }

/* footer */
.site-foot { border-top: 1px solid var(--rule); }
.site-foot .wrap { padding-block: 32px; display: flex; flex-wrap: wrap; gap: 12px 32px; justify-content: space-between; color: var(--ink-2); font-size: var(--step--1); }
.site-foot a { color: var(--ink-2); }

@media (max-width: 860px) {
  .hero .wrap, .grid-2, .grid-3 { grid-template-columns: minmax(0, 1fr); }
  .layer { grid-template-columns: minmax(0, 1fr); gap: 16px; }
  .built li { grid-template-columns: minmax(0, 1fr); gap: 4px; }
  .steps li { grid-template-columns: 3rem minmax(0, 1fr); }
}
@media (prefers-reduced-motion: reduce) { .btn { transition: none; } .btn:hover { transform: none; } }