/* ==========================================================================
   Cairnix — shared stylesheet
   Light / bone theme. One file, no framework, no build step.
   ========================================================================== */

/* --- Self-hosted fonts ---------------------------------------------------- */
@font-face {
  font-family: "Space Grotesk";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("../fonts/space-grotesk-400.woff2") format("woff2");
}
@font-face {
  font-family: "Space Grotesk";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url("../fonts/space-grotesk-500.woff2") format("woff2");
}
@font-face {
  font-family: "Space Grotesk";
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url("../fonts/space-grotesk-700.woff2") format("woff2");
}
@font-face {
  font-family: "IBM Plex Mono";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("../fonts/ibm-plex-mono-400.woff2") format("woff2");
}
@font-face {
  font-family: "IBM Plex Mono";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url("../fonts/ibm-plex-mono-500.woff2") format("woff2");
}

/* --- Design tokens -------------------------------------------------------- */
:root {
  --graphite: #2B2F36;       /* text, wordmark, footer + contrast band bg */
  --bone: #F4F2ED;           /* page background */
  --amber: #F5A623;          /* accent only — links/active/CTA, never body text */
  --muted: #5A5F68;          /* secondary text, captions */
  --hairline: #DCD9D2;       /* borders, dividers, rules */
  --card: #FBFAF7;           /* card surfaces */
  --amber-on-dark: #412402;  /* readable text ON an amber fill (CTA labels) */
  --amber-label: #BA7517;    /* darker amber for labels/links on light bg (AA) */
  --bone-dim: #B9B6AE;       /* muted text on graphite */

  --sans: "Space Grotesk", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  --wrap: 900px;
  --gutter: 1.5rem;
  --radius: 4px;
  --focus: 0 0 0 3px rgba(245, 166, 35, 0.45);
}

/* --- Reset / base --------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

body {
  margin: 0;
  background: var(--bone);
  color: var(--graphite);
  font-family: var(--sans);
  font-weight: 400;
  font-size: 1.0625rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--sans);
  font-weight: 500;
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin: 0 0 0.5em;
  color: var(--graphite);
}
h1 { font-size: clamp(2rem, 5.5vw, 3.1rem); }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.1rem); }
h3 { font-size: 1.25rem; }

p { margin: 0 0 1rem; }
p:last-child { margin-bottom: 0; }

a { color: var(--amber-label); text-decoration: underline; text-underline-offset: 2px; }
a:hover { color: var(--graphite); }

strong { font-weight: 700; }

img, svg { max-width: 100%; height: auto; }

:focus-visible {
  outline: none;
  box-shadow: var(--focus);
  border-radius: var(--radius);
}

/* Skip link */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--graphite);
  color: var(--bone);
  padding: 0.6rem 1rem;
  z-index: 100;
  text-decoration: none;
}
.skip-link:focus { left: 0.5rem; top: 0.5rem; }

/* --- Layout helpers ------------------------------------------------------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

section { padding-block: clamp(3rem, 7vw, 5.5rem); }
section.tight { padding-block: clamp(2rem, 4vw, 3rem); }

.eyebrow {
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--amber-label);
  margin: 0 0 0.9rem;
  display: block;
}

.lede {
  font-size: clamp(1.1rem, 2.2vw, 1.3rem);
  line-height: 1.55;
  color: var(--muted);
  max-width: 42ch;
}
.lede.wide { max-width: 56ch; }

.muted { color: var(--muted); }
.center { text-align: center; }
.center .lede { margin-inline: auto; }

.hairline-top { border-top: 1px solid var(--hairline); }

/* --- Header / nav --------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bone) 92%, transparent);
  -webkit-backdrop-filter: saturate(140%) blur(8px);
  backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--hairline);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
}

.wordmark {
  font-family: var(--sans);
  font-weight: 700;
  font-size: 1.4rem;
  letter-spacing: -0.02em;
  color: var(--graphite);
  text-decoration: none;
}
.wordmark .wm-x { color: var(--amber); }
.wordmark:hover { color: var(--graphite); }

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.6rem;
}
.site-nav a {
  font-family: var(--mono);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  color: var(--graphite);
  text-decoration: none;
  padding: 0.3rem 0;
  border-bottom: 2px solid transparent;
}
.site-nav a:hover { color: var(--amber-label); }
.site-nav a[aria-current="page"] {
  color: var(--amber-label);
  border-bottom-color: var(--amber);
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  width: 44px;
  height: 40px;
  cursor: pointer;
  color: var(--graphite);
  align-items: center;
  justify-content: center;
}
.nav-toggle svg { width: 22px; height: 22px; display: block; }

/* --- Buttons / CTAs ------------------------------------------------------- */
.btn {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 0.8rem 1.5rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.08s ease, background 0.15s ease;
}
.btn-primary {
  background: var(--amber);
  color: var(--amber-on-dark);
  font-weight: 500;
}
.btn-primary:hover { background: #e3990f; color: var(--amber-on-dark); }
.btn-primary:active { transform: translateY(1px); }

.btn-ghost {
  background: transparent;
  color: var(--graphite);
  border-color: var(--hairline);
}
.btn-ghost:hover { border-color: var(--graphite); color: var(--graphite); }

/* On dark bands */
.band .btn-ghost { color: var(--bone); border-color: rgba(244, 242, 237, 0.3); }
.band .btn-ghost:hover { border-color: var(--bone); color: var(--bone); }

/* --- Hero ----------------------------------------------------------------- */
.hero { padding-block: clamp(3.5rem, 9vw, 7rem); }
.hero h1 { max-width: 16ch; }
.hero .lede { margin-top: 1.2rem; }
.hero .cta-row { margin-top: 2rem; display: flex; gap: 0.9rem; flex-wrap: wrap; }

/* --- Graphite contrast band ----------------------------------------------- */
.band {
  background: var(--graphite);
  color: var(--bone);
}
.band h2, .band h3 { color: var(--bone); }
.band .eyebrow { color: var(--amber); }
.band .lede { color: var(--bone-dim); }
.band a:not(.btn) { color: var(--amber); }
.band a:not(.btn):hover { color: #ffce7a; }

/* --- Card grids ----------------------------------------------------------- */
.grid {
  display: grid;
  gap: 1.25rem;
  margin-top: 2rem;
}
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

.card {
  background: var(--card);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  padding: 1.5rem;
}
.card .tag {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--amber-label);
  display: block;
  margin-bottom: 0.6rem;
}
.card h3 { margin-bottom: 0.4rem; }
.card p { color: var(--muted); font-size: 0.97rem; }

/* --- Chips (process / roadmap teaser / inquiry types) --------------------- */
.chips {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}
.chips li {
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.03em;
  padding: 0.45rem 0.85rem;
  border: 1px solid var(--hairline);
  border-radius: 999px;
  background: var(--card);
  color: var(--graphite);
}
.band .chips li {
  border-color: rgba(244, 242, 237, 0.22);
  background: rgba(244, 242, 237, 0.04);
  color: var(--bone);
}
/* Flow connector between sequence chips */
.chips.flow li { position: relative; }
.chips.flow li:not(:last-child)::after {
  content: "→";
  color: var(--amber);
  margin-left: 0.7rem;
  margin-right: -0.35rem;
}

/* --- Detail rows (What we do) --------------------------------------------- */
.detail {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 1.5rem 2.5rem;
  padding-block: 2.25rem;
  border-top: 1px solid var(--hairline);
}
.detail:last-of-type { border-bottom: 1px solid var(--hairline); }
.detail .detail-key .tag {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--amber-label);
  display: block;
  margin-bottom: 0.3rem;
}
.detail .detail-key h3 { margin: 0; }
.detail .detail-body p { color: var(--muted); }
.detail .caps {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.detail .caps li {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.03em;
  color: var(--graphite);
  padding: 0.3rem 0.6rem;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  background: var(--bone);
}

/* --- Roadmap phases (on band) -------------------------------------------- */
.phases {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}
.phase {
  border: 1px solid rgba(244, 242, 237, 0.18);
  border-radius: var(--radius);
  padding: 1.25rem;
  background: rgba(244, 242, 237, 0.03);
}
.phase .idx {
  font-family: var(--mono);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--amber);
  display: block;
  margin-bottom: 0.5rem;
}
.phase h3 { color: var(--bone); font-size: 1.05rem; margin-bottom: 0.3rem; }
.phase p { color: var(--bone-dim); font-size: 0.9rem; margin: 0; }

/* --- Architecture diagram band ------------------------------------------- */
.diagram-band { text-align: center; }
.diagram-band .arch { width: 100%; max-width: 760px; margin: 1.75rem auto 0; height: auto; }
.diagram-band .band-label {
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--amber);
  margin-top: 1.5rem;
}

/* --- Contact band --------------------------------------------------------- */
.contact-band { text-align: center; }
.contact-band .mail {
  display: inline-block;
  font-family: var(--sans);
  font-weight: 500;
  font-size: clamp(1.5rem, 5vw, 2.6rem);
  color: var(--amber);
  text-decoration: none;
  letter-spacing: -0.01em;
  margin: 0.5rem 0 1rem;
  border-bottom: 2px solid transparent;
}
.contact-band .mail:hover { color: #ffce7a; border-bottom-color: var(--amber); }
.contact-band .note { color: var(--bone-dim); font-family: var(--mono); font-size: 0.85rem; }

/* --- Roles grid (Careers) ------------------------------------------------- */
.roles {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}
.roles li {
  border: 1px solid var(--hairline);
  border-left: 3px solid var(--amber);
  border-radius: var(--radius);
  background: var(--card);
  padding: 0.9rem 1.1rem;
  font-family: var(--mono);
  font-size: 0.9rem;
}

/* --- Footer --------------------------------------------------------------- */
.site-footer {
  background: var(--graphite);
  color: var(--bone-dim);
  padding-block: 3rem;
  border-top: 3px solid var(--amber);
}
.footer-inner { display: grid; gap: 1.5rem; }
.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 1.5rem;
}
.footer-brand .wordmark { color: var(--bone); display: inline-block; margin-bottom: 0.4rem; }
.footer-brand .wordmark:hover { color: var(--bone); }
.footer-tagline { color: var(--bone-dim); font-size: 0.95rem; max-width: 30ch; margin: 0; }
.footer-email {
  font-family: var(--mono);
  font-size: 1.05rem;
  color: var(--amber);
  text-decoration: none;
}
.footer-email:hover { color: #ffce7a; text-decoration: underline; }
.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.2rem;
}
.footer-nav a {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--bone-dim);
  text-decoration: none;
}
.footer-nav a:hover { color: var(--bone); }
.footer-legal {
  border-top: 1px solid rgba(244, 242, 237, 0.12);
  padding-top: 1.25rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--bone-dim);
  margin: 0;
}

/* --- Responsive ----------------------------------------------------------- */
@media (max-width: 720px) {
  .nav-toggle { display: inline-flex; }
  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: var(--bone);
    border-bottom: 1px solid var(--hairline);
    padding: 0.5rem var(--gutter) 1rem;
    display: none;
  }
  .site-nav.open { display: flex; }
  .site-nav a { width: 100%; padding: 0.7rem 0; border-bottom: 1px solid var(--hairline); }
  .site-nav a[aria-current="page"] { border-bottom-color: var(--amber); }

  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .phases { grid-template-columns: 1fr; }
  .roles { grid-template-columns: 1fr; }
  .detail { grid-template-columns: 1fr; gap: 0.75rem; padding-block: 1.75rem; }
  .chips.flow li:not(:last-child)::after { content: ""; margin: 0; }
}

@media (max-width: 480px) {
  body { font-size: 1rem; }
}