/* ==========================================================================
   Frontier Systems — design tokens
   ========================================================================== */
:root {
  --ink:        #0B1220;   /* page background */
  --panel:      #121C2E;   /* card / panel background */
  --panel-2:    #16233A;   /* slightly raised panel */
  --line:       #26334A;   /* hairline borders */
  --paper:      #E9EDF3;   /* primary text */
  --muted:      #8B9AB3;   /* secondary text */
  --amber:      #F2A93B;   /* signal accent — CTAs, alerts */
  --amber-dim:  #7A5A25;
  --cyan:       #4FD1C5;   /* flow accent — data, motion */

  --display: 'Space Grotesk', sans-serif;
  --body:    'Inter', sans-serif;
  --mono:    'IBM Plex Mono', monospace;

  --max: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* faint grid texture across the whole page, evokes a plotting / sim canvas */
body {
  background-image:
    linear-gradient(rgba(233, 237, 243, 0.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(233, 237, 243, 0.028) 1px, transparent 1px);
  background-size: 42px 42px;
  background-position: -1px -1px;
}

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

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 28px;
}

/* ---------- headings & type scale ---------- */
h1, h2, h3 {
  font-family: var(--display);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0;
  color: var(--paper);
}
h1 { font-size: clamp(2.4rem, 5vw, 4.2rem); line-height: 1.05; }
h2 { font-size: clamp(1.7rem, 3vw, 2.4rem); line-height: 1.15; }
h3 { font-size: 1.15rem; }

p { margin: 0 0 1em; color: var(--muted); }
p.lead { color: var(--paper); font-size: 1.15rem; }

.eyebrow {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.eyebrow::before {
  content: "";
  width: 7px;
  height: 7px;
  background: var(--cyan);
  border-radius: 1px;
  transform: rotate(45deg);
  display: inline-block;
}

.mono { font-family: var(--mono); }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  text-decoration: none;
  padding: 13px 22px;
  border-radius: 3px;
  border: 1px solid var(--line);
  transition: border-color 0.18s ease, background 0.18s ease, transform 0.18s ease;
}
.btn-primary {
  background: var(--amber);
  border-color: var(--amber);
  color: #16130A;
  font-weight: 600;
}
.btn-primary:hover { transform: translateY(-1px); background: #ffb84f; }
.btn-ghost {
  color: var(--paper);
  background: transparent;
}
.btn-ghost:hover { border-color: var(--cyan); color: var(--cyan); }

.btn:focus-visible, a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* ---------- nav ---------- */
header.site {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(11, 18, 32, 0.86);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 28px;
  max-width: var(--max);
  margin: 0 auto;
}
.logo {
  font-family: var(--mono);
  font-weight: 600;
  font-size: 1rem;
  letter-spacing: 0.08em;
  text-decoration: none;
  color: var(--paper);
  display: flex;
  align-items: center;
  gap: 10px;
}
.logo .mark {
  width: 18px;
  height: 18px;
  border: 1.5px solid var(--amber);
  position: relative;
  transform: rotate(45deg);
  flex: none;
}
.logo .mark::after {
  content: "";
  position: absolute;
  inset: 4px;
  background: var(--amber);
}
.navlinks {
  display: flex;
  gap: 8px;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--mono);
  font-size: 0.85rem;
}
.navlinks a {
  text-decoration: none;
  color: var(--muted);
  padding: 8px 14px;
  border-radius: 3px;
  transition: color 0.15s ease, background 0.15s ease;
}
.navlinks a:hover { color: var(--paper); }
.navlinks a.active { color: var(--ink); background: var(--cyan); }

.navtoggle {
  display: none;
  background: none;
  border: 1px solid var(--line);
  color: var(--paper);
  border-radius: 3px;
  padding: 8px 10px;
  font-family: var(--mono);
}

/* ---------- hero ---------- */
.hero {
  padding: 88px 0 64px;
  border-bottom: 1px solid var(--line);
}
.hero .wrap {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
}
.hero h1 { margin: 18px 0 20px; }
.hero .actions { display: flex; gap: 14px; margin-top: 32px; flex-wrap: wrap; }

.hero-diagram {
  border: 1px solid var(--line);
  background: var(--panel);
  border-radius: 4px;
  aspect-ratio: 1 / 0.82;
  position: relative;
  overflow: hidden;
}
.hero-diagram svg { width: 100%; height: 100%; }
.hero-diagram .tag {
  position: absolute;
  bottom: 12px;
  left: 14px;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--muted);
}
.hero-diagram .tag span { color: var(--cyan); }

@media (prefers-reduced-motion: reduce) {
  .flow-dot { animation: none !important; offset-distance: 0 !important; }
}

/* ---------- stat strip ---------- */
.stats {
  border-bottom: 1px solid var(--line);
  background: var(--panel);
}
.stats .wrap {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  padding: 0;
}
.stat {
  padding: 26px 28px;
  border-right: 1px solid var(--line);
}
.stat:last-child { border-right: none; }
.stat .n {
  font-family: var(--mono);
  color: var(--amber);
  font-size: 1.5rem;
  display: block;
}
.stat .l {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* ---------- sections ---------- */
section { padding: 84px 0; }
.section-head {
  max-width: 640px;
  margin-bottom: 48px;
}
.section-head h2 { margin-top: 14px; }

/* services grid */
.services {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.service {
  background: var(--ink);
  padding: 30px 26px;
}
.service .id {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--cyan);
  letter-spacing: 0.08em;
}
.service h3 { margin: 14px 0 10px; }
.service p { margin: 0; font-size: 0.94rem; }

/* approach / process */
.approach {
  background: var(--panel);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.approach-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 26px;
  margin-top: 40px;
}
.approach-list .step .k {
  font-family: var(--mono);
  color: var(--muted);
  font-size: 0.78rem;
}
.approach-list .step h3 { margin: 10px 0 8px; font-size: 1.05rem; }
.approach-list .step p { font-size: 0.92rem; margin: 0; }

/* cards (projects) */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.card {
  border: 1px solid var(--line);
  background: var(--panel);
  border-radius: 4px;
  padding: 30px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.card .tags { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 6px; }
.chip {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  color: var(--cyan);
  border: 1px solid var(--amber-dim);
  border-color: rgba(79, 209, 197, 0.35);
  padding: 4px 9px;
  border-radius: 20px;
}
.card .code { font-family: var(--mono); color: var(--amber); font-size: 0.78rem; }
.card .metric-row { display: flex; gap: 24px; margin-top: 4px; padding-top: 16px; border-top: 1px solid var(--line); }
.card .metric b { display: block; font-family: var(--mono); color: var(--paper); font-size: 1.1rem; }
.card .metric span { font-size: 0.72rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.04em; }

/* about page */
.about-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 56px;
  align-items: start;
}
.portrait {
  border: 1px solid var(--line);
  background: var(--panel);
  border-radius: 4px;
  aspect-ratio: 4/5;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  color: var(--muted);
  font-size: 0.85rem;
  text-align: center;
  padding: 20px;
}
.timeline { margin-top: 10px; border-left: 1px solid var(--line); padding-left: 24px; display: flex; flex-direction: column; gap: 28px; }
.timeline .t-item .y { font-family: var(--mono); color: var(--amber); font-size: 0.8rem; }
.timeline .t-item h3 { margin: 6px 0; font-size: 1.02rem; }
.timeline .t-item p { margin: 0; font-size: 0.92rem; }

.credentials { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: var(--line); border: 1px solid var(--line); margin-top: 8px; }
.credentials div { background: var(--ink); padding: 20px 22px; }
.credentials .k { font-family: var(--mono); font-size: 0.72rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.05em; }
.credentials .v { margin-top: 6px; font-size: 0.95rem; }

/* contact */
.contact-grid { display: grid; grid-template-columns: 0.85fr 1.15fr; gap: 56px; }
.contact-info .row { padding: 18px 0; border-bottom: 1px solid var(--line); }
.contact-info .row:first-child { padding-top: 0; }
.contact-info .k { font-family: var(--mono); font-size: 0.72rem; color: var(--cyan); text-transform: uppercase; letter-spacing: 0.06em; }
.contact-info .v { margin-top: 6px; font-size: 1.02rem; }
.contact-info .v a { text-decoration: none; border-bottom: 1px solid var(--line); }
.contact-info .v a:hover { border-color: var(--cyan); color: var(--cyan); }

form.contact-form { display: flex; flex-direction: column; gap: 18px; }
.field { display: flex; flex-direction: column; gap: 8px; }
.field label {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted);
}
.field input, .field textarea, .field select {
  background: var(--panel);
  border: 1px solid var(--line);
  color: var(--paper);
  border-radius: 3px;
  padding: 13px 14px;
  font-family: var(--body);
  font-size: 0.98rem;
  resize: vertical;
}
.field input:focus, .field textarea:focus, .field select:focus {
  border-color: var(--cyan);
  outline: none;
}
.field textarea { min-height: 140px; }
.form-note { font-size: 0.8rem; color: var(--muted); }
.hidden { display: none; }

/* footer */
footer.site {
  border-top: 1px solid var(--line);
  padding: 40px 0;
}
footer.site .wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}
footer .fmono { font-family: var(--mono); font-size: 0.78rem; color: var(--muted); }

/* ---------- responsive ---------- */
@media (max-width: 880px) {
  .hero .wrap { grid-template-columns: 1fr; }
  .hero-diagram { order: -1; }
  .stats .wrap { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(2) { border-right: none; }
  .services { grid-template-columns: 1fr; }
  .approach-list { grid-template-columns: repeat(2, 1fr); }
  .grid-2 { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .credentials { grid-template-columns: 1fr; }

  .navlinks {
    position: absolute;
    top: 100%; left: 0; right: 0;
    background: var(--ink);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    align-items: stretch;
    padding: 10px;
    display: none;
  }
  .navlinks.open { display: flex; }
  .navtoggle { display: block; }
}