/* ===================================================================
   INTERACT COMPUTING — engineered editorial
   Warm linen ground · dominant deep navy · sharp azure signal
   Clash Display / General Sans / IBM Plex Mono
   =================================================================== */

:root {
  /* ink + brand */
  --ink: #06182E;          /* near-black navy — body text */
  --navy: #00204a;         /* brand navy */
  --navy-deep: #041326;    /* deepest panel */

  /* grounds */
  --paper: #F1ECE2;        /* warm linen */
  --paper-2: #E9E2D4;      /* deeper linen band */
  --card: #FCFBF7;         /* warm white card */

  /* lines + muted */
  --line: #D6CDBA;         /* hairline on linen */
  --line-ink: rgba(6, 24, 46, 0.12);
  --muted: #565E6C;        /* secondary text — AA on linen */
  --muted-warm: #645E50;   /* warm muted labels — AA on linen */

  /* signal */
  --accent: #1F6FEB;       /* sharp azure */
  --accent-ink: #0B4FCB;
  --accent-bright: #5AA2FF;/* azure on dark */

  /* on dark */
  --cream: #ECE6D7;        /* warm off-white text on navy */
  --cream-dim: #AFB9C9;

  --white: #ffffff;

  /* system */
  --radius: 4px;
  --radius-lg: 6px;
  --maxw: 1180px;
  --gutter: clamp(1.25rem, 4vw, 3rem);

  --shadow-card: 0 1px 0 rgba(6,24,46,0.04);
  --shadow-lift: 0 24px 50px -28px rgba(6, 24, 46, 0.45);

  --font-body: "General Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-display: "Clash Display", "General Sans", Georgia, serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --ease: cubic-bezier(0.22, 0.7, 0.2, 1);
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
  font-size: 1.0625rem;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* grain overlay */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 9999;
  pointer-events: none;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

::selection { background: var(--navy); color: var(--cream); }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--navy);
  font-weight: 600;
  line-height: 1.02;
  letter-spacing: -0.02em;
  margin: 0 0 0.5em;
}
h1 { font-size: clamp(2.9rem, 7.2vw, 5.6rem); letter-spacing: -0.02em; }
h2 { font-size: clamp(2rem, 4.6vw, 3.4rem); }
h3 { font-size: 1.5rem; letter-spacing: -0.015em; }

p { margin: 0 0 1rem; }

a { color: var(--accent-ink); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

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

strong { font-weight: 600; }

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

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.section { padding: clamp(4rem, 9vw, 8rem) 0; position: relative; }
.section--soft { background: var(--paper); }
.section--band {
  background: var(--paper-2);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background-image:
    linear-gradient(var(--line-ink) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-ink) 1px, transparent 1px);
  background-size: 64px 64px, 64px 64px;
  background-blend-mode: normal;
}
.section--band > .container { position: relative; }

/* ---------- Eyebrow / labels (mono, technical) ---------- */
.eyebrow {
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--accent-ink);
  margin: 0 0 1.4rem;
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
}
.eyebrow::before {
  content: "";
  width: 1.8rem;
  height: 1px;
  background: currentColor;
  display: inline-block;
}

.lead {
  font-size: clamp(1.1rem, 1.6vw, 1.3rem);
  line-height: 1.55;
  color: var(--muted);
  max-width: 60ch;
}

.center { text-align: center; }
.center .eyebrow { justify-content: center; }
.center .lead { margin-left: auto; margin-right: auto; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.95rem 1.6rem;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.98rem;
  letter-spacing: 0.01em;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform 0.25s var(--ease), background 0.25s var(--ease),
    color 0.25s var(--ease), border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
  text-decoration: none;
}
.btn::after {
  content: "→";
  font-family: var(--font-mono);
  transition: transform 0.25s var(--ease);
}
.btn:hover { text-decoration: none; }
.btn:hover::after { transform: translateX(4px); }

.btn--primary { background: var(--accent); color: #fff; }
.btn--primary:hover { background: var(--accent-ink); box-shadow: var(--shadow-lift); }
.btn--light { background: var(--cream); color: var(--navy); }
.btn--light:hover { background: #fff; box-shadow: var(--shadow-lift); }
.btn--outline { background: transparent; color: var(--navy); border-color: var(--line); }
.btn--outline:hover { border-color: var(--navy); background: var(--navy); color: var(--cream); }

/* nav CTA stays compact */
.nav-links .btn { padding: 0.6rem 1.1rem; font-size: 0.92rem; }
.nav-links .btn::after { content: none; }

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--paper) 82%, transparent);
  backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}
.brand { display: flex; align-items: center; gap: 0.7rem; text-decoration: none; }
.brand:hover { text-decoration: none; }
.brand-mark { display: block; height: 42px; width: 42px; flex: none; }
.brand-name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.18rem;
  letter-spacing: -0.01em;
  line-height: 1;
  white-space: nowrap;
}
.brand-name .b-interact { color: var(--navy); }
.brand-name .b-computing { color: var(--accent); }
/* footer variants (dark ground) */
.site-footer .brand-mark { height: 48px; width: 48px; }
.site-footer .brand-name .b-interact { color: #fff; }
.site-footer .brand-name .b-computing { color: var(--accent-bright); }
@media (max-width: 480px) {
  .brand-mark { height: 36px; width: 36px; }
  .brand-name { font-size: 1.05rem; }
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-links > li { display: flex; }
.nav-links a:not(.btn) {
  position: relative;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink);
  font-weight: 400;
  font-size: 0.78rem;
  padding: 0.55rem 0.9rem;
  text-decoration: none;
  transition: color 0.2s var(--ease);
}
.nav-links a:not(.btn)::after {
  content: "";
  position: absolute;
  left: 0.9rem;
  right: 0.9rem;
  bottom: 0.35rem;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.28s var(--ease);
}
.nav-links a:not(.btn):hover { color: var(--accent-ink); }
.nav-links a:not(.btn):hover::after { transform: scaleX(1); }
.nav-links a.active { color: var(--accent-ink); }
.nav-links a.active::after { transform: scaleX(1); }

.nav-toggle {
  display: none;
  background: none;
  border: 0;
  cursor: pointer;
  padding: 0.5rem;
  width: 44px;
  height: 44px;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 1.5px;
  background: var(--navy);
  margin: 6px auto;
  transition: transform 0.25s var(--ease), opacity 0.25s var(--ease);
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(168deg, var(--navy) 0%, var(--navy-deep) 100%);
  color: var(--cream);
}
/* blueprint grid */
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.045) 1px, transparent 1px);
  background-size: 72px 72px, 72px 72px;
  mask-image: radial-gradient(120% 100% at 30% 0%, #000 35%, transparent 80%);
  -webkit-mask-image: radial-gradient(120% 100% at 30% 0%, #000 35%, transparent 80%);
  pointer-events: none;
}
/* icon watermark + glow */
.hero::after {
  content: "";
  position: absolute;
  top: 50%;
  right: -6%;
  transform: translateY(-50%);
  width: min(46vw, 560px);
  aspect-ratio: 1;
  background:
    url("../assets/logo-icon-white.svg") center / contain no-repeat;
  opacity: 0.06;
  pointer-events: none;
  filter: blur(0.2px);
}
.hero .container { position: relative; z-index: 2; }
.hero .section { padding-top: clamp(4.5rem, 11vw, 9rem); padding-bottom: clamp(4.5rem, 11vw, 9rem); }
.hero .eyebrow { color: var(--accent-bright); }
.hero h1 { color: #fff; max-width: 16ch; text-wrap: balance; }
.hero .lead { color: var(--cream-dim); max-width: 56ch; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.9rem; margin-top: 2.25rem; }

/* hero meta row */
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 2.5rem;
  margin-top: 3.5rem;
  padding-top: 1.75rem;
  border-top: 1px solid rgba(255,255,255,0.14);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--cream-dim);
}
.hero-meta span { color: #fff; }

/* hero entrance */
@keyframes rise { from { opacity: 0; transform: translateY(26px); } to { opacity: 1; transform: none; } }
.hero .eyebrow { animation: rise 0.7s 0.05s both var(--ease); }
.hero h1 { animation: rise 0.85s 0.16s both var(--ease); }
.hero .lead { animation: rise 0.85s 0.3s both var(--ease); }
.hero-actions { animation: rise 0.85s 0.44s both var(--ease); }
.hero-meta { animation: rise 0.85s 0.58s both var(--ease); }

/* ---------- Marquee ---------- */
.marquee {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--paper-2);
  overflow: hidden;
  padding: 0.9rem 0;
}
.marquee-track {
  display: flex;
  gap: 3rem;
  width: max-content;
  animation: scroll-x 34s linear infinite;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.78rem;
  color: var(--muted-warm);
  white-space: nowrap;
}
.marquee:hover .marquee-track { animation-play-state: paused; }
.marquee-track span { display: inline-flex; align-items: center; gap: 3rem; }
.marquee-track span::before { content: "◆"; color: var(--accent); font-size: 0.6rem; }
@keyframes scroll-x { from { transform: translateX(0); } to { transform: translateX(-50%); } }

/* ---------- Section header ---------- */
.section-head { max-width: 64ch; margin-bottom: clamp(2.5rem, 5vw, 4rem); }
.section-head.center { margin-left: auto; margin-right: auto; }

/* ---------- Grid / Cards ---------- */
.grid {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
}
.card {
  position: relative;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 2rem 1.85rem 2.1rem;
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease),
    border-color 0.35s var(--ease);
  overflow: hidden;
}
.card::before {
  content: "";
  position: absolute;
  left: 0; top: 0;
  width: 100%;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s var(--ease);
}
.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lift);
  border-color: color-mix(in srgb, var(--accent) 40%, var(--line));
}
.card:hover::before { transform: scaleX(1); }
.card .icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--accent-ink);
  display: grid;
  place-items: center;
  margin-bottom: 1.5rem;
  transition: background 0.35s var(--ease), color 0.35s var(--ease), border-color 0.35s var(--ease);
}
.card:hover .icon { background: var(--accent); border-color: var(--accent); color: #fff; }
.card .icon svg { width: 24px; height: 24px; }
.card h3 { margin-bottom: 0.55rem; }
.card p { margin: 0; color: var(--muted); font-size: 0.98rem; line-height: 1.55; }

/* featured = inverted navy panel */
.card--feature {
  background: linear-gradient(165deg, var(--navy) 0%, var(--navy-deep) 100%);
  border-color: var(--navy);
  color: var(--cream);
}
.card--feature::before { background: var(--accent-bright); transform: scaleX(1); }
.card--feature h3 { color: #fff; }
.card--feature p { color: var(--cream-dim); }
.card--feature .icon { background: var(--accent); border-color: var(--accent); color: #fff; }
.card--feature:hover { transform: translateY(-6px); border-color: var(--accent-bright); }
.card--feature:hover .icon { background: #fff; color: var(--navy); }
.card--feature .tag {
  position: absolute;
  top: 1.4rem; right: 1.4rem;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-bright);
  border: 1px solid rgba(90,162,255,0.4);
  padding: 0.25rem 0.5rem;
  border-radius: 100px;
}

/* ---------- Features / why ---------- */
.features {
  display: grid;
  gap: 2.5rem 2rem;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  counter-reset: feat;
}
.feature { counter-increment: feat; }
.feature h3 {
  display: flex;
  align-items: baseline;
  gap: 0.8rem;
  font-size: 1.3rem;
  margin-bottom: 0.5rem;
}
.feature h3::before {
  content: counter(feat, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--accent-ink);
  letter-spacing: 0;
}
.feature .dot { display: none; }
.feature p { color: var(--muted); margin: 0; }

/* ---------- CTA ---------- */
.cta {
  position: relative;
  overflow: hidden;
  background: linear-gradient(150deg, var(--navy) 0%, var(--navy-deep) 100%);
  color: var(--cream);
  border-radius: var(--radius-lg);
  padding: clamp(2.75rem, 6vw, 5rem);
  text-align: center;
}
.cta::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.05) 1px, transparent 1px);
  background-size: 56px 56px, 56px 56px;
  mask-image: radial-gradient(80% 120% at 50% 0%, #000, transparent 75%);
  -webkit-mask-image: radial-gradient(80% 120% at 50% 0%, #000, transparent 75%);
  pointer-events: none;
}
.cta > * { position: relative; z-index: 1; }
.cta h2 { color: #fff; max-width: 18ch; margin-left: auto; margin-right: auto; }
.cta p { color: var(--cream-dim); max-width: 52ch; margin: 0 auto; }
.cta .btn--light { margin-top: 1.75rem; }

/* ---------- Contact ---------- */
.contact-grid {
  display: grid;
  gap: 3rem;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: start;
}
.contact-grid h2 { margin-bottom: 1.75rem; }
.form-field { margin-bottom: 1.25rem; }
.form-field label {
  display: block;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.72rem;
  color: var(--navy);
  margin-bottom: 0.5rem;
}
.form-field input,
.form-field textarea {
  width: 100%;
  padding: 0.9rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 1rem;
  color: var(--ink);
  background: var(--card);
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}
.form-field input::placeholder,
.form-field textarea::placeholder { color: #b3ab98; }
.form-field input:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(31, 111, 235, 0.16);
}
.form-field textarea { resize: vertical; min-height: 150px; }
.form-note { font-size: 0.86rem; color: var(--muted); margin-top: 1rem; }

.contact-aside {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 2rem 1.85rem;
}
.contact-item { padding-bottom: 1.4rem; margin-bottom: 1.4rem; border-bottom: 1px solid var(--line); }
.contact-item:last-child { margin-bottom: 0; padding-bottom: 0; border-bottom: 0; }
.contact-item .label {
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.66rem;
  color: var(--muted-warm);
  margin-bottom: 0.4rem;
}
.contact-item a { font-weight: 600; font-size: 1.05rem; word-break: break-word; }
.contact-item p { margin: 0; }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--navy-deep);
  color: var(--cream-dim);
  padding: clamp(3.5rem, 7vw, 5.5rem) 0 2rem;
  font-size: 0.95rem;
  position: relative;
  overflow: hidden;
}
.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 72px 72px, 72px 72px;
  mask-image: radial-gradient(90% 120% at 80% 0%, #000, transparent 70%);
  -webkit-mask-image: radial-gradient(90% 120% at 80% 0%, #000, transparent 70%);
  pointer-events: none;
}
.site-footer .container { position: relative; z-index: 1; }
.footer-top {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 2.5rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}
.footer-brand { max-width: 36ch; }
.footer-brand .brand { margin-bottom: 1.25rem; }
.footer-brand p { color: var(--cream-dim); margin: 0; }
.footer-nav { display: flex; gap: 3.5rem; flex-wrap: wrap; }
.footer-col h4 {
  color: #fff;
  font-family: var(--font-mono);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.72rem;
  margin-bottom: 1rem;
}
.footer-col a { display: block; color: var(--cream-dim); padding: 0.3rem 0; transition: color 0.2s var(--ease); }
.footer-col a:hover { color: #fff; text-decoration: none; }
.footer-bottom {
  padding-top: 2rem;
  text-align: center;
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
  font-size: 0.74rem;
  color: var(--cream-dim);
  text-transform: uppercase;
}

/* ---------- Scroll reveal (progressive) ---------- */
.js-reveal .reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
  will-change: opacity, transform;
}
.js-reveal .reveal.in { opacity: 1; transform: none; }

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .nav-toggle { display: block; }
  .nav-links {
    position: absolute;
    top: 80px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    padding: 0.75rem var(--gutter) 1.5rem;
    box-shadow: var(--shadow-lift);
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a:not(.btn) { padding: 0.9rem 0.25rem; font-size: 0.85rem; }
  .nav-links a:not(.btn)::after { left: 0.25rem; right: auto; width: 1.5rem; }
  .nav-links .btn { margin-top: 0.75rem; justify-content: center; }
  .contact-grid { grid-template-columns: 1fr; gap: 2rem; }
  .hero::after { opacity: 0.04; right: -20%; }
  /* larger tap targets on touch */
  .footer-col a { min-height: 44px; display: inline-flex; align-items: center; padding: 0.2rem 0; }
  .footer-nav { gap: 2rem 3.5rem; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-delay: 0s !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  .js-reveal .reveal { opacity: 1; transform: none; }
}