/* =========================================================================
   MutexFirmware — shared stylesheet
   Dark technical design system. Copper-amber signal accent on blue-black.
   ========================================================================= */

:root {
  /* --- surfaces --- */
  --bg:        #0B0F14;   /* deep blue-black ground */
  --bg-2:      #0E141B;   /* subtle band contrast */
  --panel:     #141B24;   /* cards / raised surfaces */
  --panel-2:   #10161E;
  --line:      #233040;   /* hairlines / borders */
  --line-soft: #1A2530;

  /* --- ink --- */
  --text:      #E6EDF3;   /* primary */
  --muted:     #8A97A6;   /* secondary */
  --faint:     #5B6875;   /* tertiary / captions */

  /* --- accent (copper-amber signal) --- */
  --signal:      #F5A524;
  --signal-soft: #FFC24D;
  --signal-dim:  rgba(245, 165, 36, 0.12);
  --signal-line: rgba(245, 165, 36, 0.28);

  /* --- semantic --- */
  --ok:   #3DD68C;
  --warn: #F5A524;

  /* --- type --- */
  --f-display: "Chivo", "Helvetica Neue", Arial, sans-serif;
  --f-body:    "IBM Plex Sans", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  --f-mono:    "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  /* --- layout --- */
  --maxw: 1120px;
  --gutter: clamp(18px, 5vw, 40px);
  --radius: 10px;
  --radius-sm: 7px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--f-body);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  /* faint trace-grid texture */
  background-image:
    linear-gradient(rgba(35, 48, 64, 0.16) 1px, transparent 1px),
    linear-gradient(90deg, rgba(35, 48, 64, 0.16) 1px, transparent 1px);
  background-size: 46px 46px, 46px 46px;
  background-position: -1px -1px;
}

img { max-width: 100%; display: block; }

a { color: var(--signal); text-decoration: none; }
a:hover { color: var(--signal-soft); }

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

/* ---------- shell ---------- */

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

.section { padding-block: clamp(56px, 9vw, 104px); }
.section--tight { padding-block: clamp(40px, 6vw, 68px); }
.band { background: var(--bg-2); border-block: 1px solid var(--line-soft); }

/* ---------- typography ---------- */

h1, h2, h3, h4 {
  font-family: var(--f-display);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--text);
  text-wrap: balance;
  margin: 0;
}

.h-xl { font-size: clamp(2.4rem, 6vw, 4.3rem); font-weight: 800; }
.h-lg { font-size: clamp(1.9rem, 4vw, 2.9rem); }
.h-md { font-size: clamp(1.3rem, 2.4vw, 1.6rem); }

p { margin: 0 0 1rem; }
.lead {
  font-size: clamp(1.05rem, 1.6vw, 1.28rem);
  color: var(--muted);
  max-width: 60ch;
  line-height: 1.6;
}
.measure { max-width: 65ch; }

/* mono eyebrow / labels */
.eyebrow {
  font-family: var(--f-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--signal);
  text-transform: none;
  display: inline-flex;
  align-items: center;
  gap: 0.55em;
  margin: 0 0 1.1rem;
}
.eyebrow::before {
  content: "";
  width: 8px; height: 8px;
  background: var(--signal);
  box-shadow: 0 0 10px var(--signal);
  display: inline-block;
}
.kicker {
  font-family: var(--f-mono);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--faint);
}

/* ---------- nav ---------- */

.nav {
  position: sticky;
  top: env(safe-area-inset-top, 0px);
  z-index: 50;
  background: rgba(11, 15, 20, 0.82);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line-soft);
}
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  height: 66px;
}
.brand {
  font-family: var(--f-mono);
  font-weight: 500;
  font-size: 1.02rem;
  letter-spacing: -0.01em;
  color: var(--text);
  display: inline-flex;
  align-items: center;
  gap: 2px;
}
.brand:hover { color: var(--text); }
.brand b { font-weight: 600; color: var(--text); }
.brand span { color: var(--muted); font-weight: 400; }
.brand i {
  width: 9px; height: 15px;
  background: var(--signal);
  display: inline-block;
  margin-left: 5px;
  transform: translateY(2px);
  animation: blink 1.3s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0.15; } }
@media (prefers-reduced-motion: reduce) { .brand i { animation: none; } }

.nav__links {
  display: flex;
  align-items: center;
  gap: 4px;
  font-family: var(--f-mono);
  font-size: 0.86rem;
}
.nav__links a {
  color: var(--muted);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
}
.nav__links a:hover { color: var(--text); background: var(--panel); }
.nav__links a.is-active { color: var(--signal); }
.nav__cta {
  margin-left: 6px;
}
.nav__toggle { display: none; }

/* ---------- buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55em;
  font-family: var(--f-mono);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 11px 20px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .12s ease, background .15s ease, border-color .15s ease;
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn--primary {
  background: var(--signal);
  color: #16110A;
  font-weight: 600;
}
.btn--primary:hover { background: var(--signal-soft); color: #16110A; }
.btn--ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--line);
}
.btn--ghost:hover { border-color: var(--signal-line); color: var(--signal-soft); }
.btn__arrow { transition: transform .15s ease; }
.btn:hover .btn__arrow { transform: translateX(3px); }

/* ---------- hero ---------- */

.hero { position: relative; overflow: hidden; }
.hero__glow {
  position: absolute;
  inset: -20% -10% auto -10%;
  height: 460px;
  background: radial-gradient(60% 100% at 30% 0%, rgba(245,165,36,0.10), transparent 70%);
  pointer-events: none;
}
.hero__inner { position: relative; padding-block: clamp(64px, 11vw, 128px); }
.hero .h-xl { max-width: 16ch; }
.hero .lead { margin-top: 1.3rem; }
.hero__cta { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 2.2rem; }

/* accent on a word */
.mark { color: var(--signal); }

/* ---------- chips / capability strip ---------- */

.chips { display: flex; flex-wrap: wrap; gap: 10px; }
.chip {
  font-family: var(--f-mono);
  font-size: 0.8rem;
  color: var(--muted);
  border: 1px solid var(--line);
  background: var(--panel-2);
  padding: 6px 12px;
  border-radius: 40px;
}
.chip b { color: var(--signal); font-weight: 500; }

/* ---------- grid + cards ---------- */

.grid { display: grid; gap: 18px; }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 24px;
  position: relative;
  transition: border-color .18s ease, transform .18s ease;
}
.card:hover { border-color: var(--signal-line); transform: translateY(-2px); }
.card__no {
  font-family: var(--f-mono);
  font-size: 0.76rem;
  color: var(--signal);
  letter-spacing: 0.1em;
}
.card h3 { font-size: 1.22rem; margin: 12px 0 8px; }
.card p { color: var(--muted); font-size: 0.96rem; margin: 0; }
.card__list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  font-family: var(--f-mono);
  font-size: 0.82rem;
  color: var(--faint);
}
.card__list li { padding: 3px 0 3px 16px; position: relative; }
.card__list li::before {
  content: "›";
  position: absolute; left: 0;
  color: var(--signal);
}

/* section heading block */
.head { max-width: 62ch; margin-bottom: 40px; }
.head .lead { margin-top: 0.6rem; }

/* ---------- spec / stack table ---------- */

.spec { display: grid; gap: 0; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.spec__row {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 24px;
  padding: 18px 22px;
  border-bottom: 1px solid var(--line-soft);
  align-items: baseline;
}
.spec__row:last-child { border-bottom: 0; }
.spec__row:nth-child(odd) { background: var(--panel-2); }
.spec__k {
  font-family: var(--f-mono);
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  color: var(--signal);
  text-transform: uppercase;
}
.spec__v { font-family: var(--f-mono); font-size: 0.9rem; color: var(--muted); }

/* ---------- steps / approach ---------- */

.steps { display: grid; gap: 2px; }
.step {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 22px;
  padding: 22px 0;
  border-top: 1px solid var(--line-soft);
  align-items: start;
}
.step__no {
  font-family: var(--f-mono);
  font-size: 0.9rem;
  color: var(--signal);
  padding-top: 3px;
}
.step h3 { font-size: 1.15rem; margin-bottom: 6px; }
.step p { color: var(--muted); margin: 0; font-size: 0.97rem; }

/* ---------- CTA band ---------- */

.cta {
  border: 1px solid var(--signal-line);
  background:
    linear-gradient(180deg, var(--signal-dim), transparent),
    var(--panel-2);
  border-radius: 14px;
  padding: clamp(32px, 5vw, 54px);
  text-align: center;
}
.cta h2 { margin-bottom: 12px; }
.cta .lead { margin-inline: auto; margin-bottom: 26px; }
.cta__row { display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; }

/* ---------- forms ---------- */

.form { display: grid; gap: 18px; }
.field { display: grid; gap: 7px; }
.field label {
  font-family: var(--f-mono);
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  color: var(--muted);
}
.field label span { color: var(--signal); }
.input, .textarea, .select {
  width: 100%;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--f-body);
  font-size: 0.98rem;
  padding: 12px 14px;
  transition: border-color .15s ease, background .15s ease;
}
.input:focus, .textarea:focus, .select:focus {
  outline: none;
  border-color: var(--signal-line);
  background: var(--panel);
}
.textarea { min-height: 150px; resize: vertical; font-family: var(--f-body); }
.form__row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form__note { font-family: var(--f-mono); font-size: 0.78rem; color: var(--faint); }

/* ---------- contact detail list ---------- */

.detail { display: grid; gap: 20px; }
.detail__item { border-top: 1px solid var(--line-soft); padding-top: 16px; }
.detail__item .kicker { display: block; margin-bottom: 4px; }
.detail__item a, .detail__item p { font-family: var(--f-mono); font-size: 0.98rem; margin: 0; }
.detail__item p { color: var(--text); }

/* ---------- about / prose ---------- */

.prose p { color: var(--muted); }
.prose p.big { color: var(--text); font-size: clamp(1.15rem, 2vw, 1.4rem); line-height: 1.5; }
.pullquote {
  font-family: var(--f-display);
  font-weight: 600;
  font-size: clamp(1.4rem, 3vw, 2rem);
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--text);
  border-left: 3px solid var(--signal);
  padding-left: 22px;
  margin: 36px 0;
  max-width: 24ch;
}
.value h3 { font-size: 1.1rem; margin-bottom: 6px; }
.value p { color: var(--muted); font-size: 0.95rem; margin: 0; }

/* ---------- footer ---------- */

.footer {
  border-top: 1px solid var(--line-soft);
  background: var(--bg-2);
  padding-block: 40px;
  font-size: 0.9rem;
}
.footer__inner {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  justify-content: space-between;
  align-items: center;
}
.footer__links { display: flex; flex-wrap: wrap; gap: 20px; font-family: var(--f-mono); font-size: 0.84rem; }
.footer__links a { color: var(--muted); }
.footer__links a:hover { color: var(--signal); }
.footer__meta { font-family: var(--f-mono); font-size: 0.78rem; color: var(--faint); }

/* ---------- utility ---------- */

.stack-lg { display: grid; gap: 28px; }
.center { text-align: center; }
.mt-2 { margin-top: 2rem; }
.hr { height: 1px; background: var(--line-soft); border: 0; margin: 0; }

/* ---------- responsive ---------- */

@media (max-width: 860px) {
  .grid--3 { grid-template-columns: 1fr; }
  .grid--2 { grid-template-columns: 1fr; }
  .spec__row { grid-template-columns: 1fr; gap: 4px; }
  .nav__links { display: none; }
  .nav__links.is-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 66px; left: 0; right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    padding: 12px var(--gutter) 18px;
    gap: 2px;
  }
  .nav__links.is-open a { padding: 12px 8px; }
  .nav__toggle {
    display: inline-flex;
    background: transparent;
    border: 1px solid var(--line);
    color: var(--text);
    border-radius: var(--radius-sm);
    padding: 8px 12px;
    font-family: var(--f-mono);
    font-size: 0.82rem;
    cursor: pointer;
  }
  .form__row { grid-template-columns: 1fr; }
}