/* ============================================================
   Allied Cognition — bold & techy
   ============================================================ */

:root {
  --bg:        #0A0A0F;
  --bg-elev:   #12121A;
  --bg-card:   #15151F;
  --line:      #242432;
  --text:      #EDEDF2;
  --muted:     #8B8BA3;
  --muted-dim: #5C5C72;
  --indigo:    #6D5EF6;
  --cyan:      #22D3EE;
  --grad:      linear-gradient(120deg, #6D5EF6 0%, #22D3EE 100%);

  --font-display: "Space Grotesk", ui-sans-serif, system-ui, sans-serif;
  --font-body:    "Inter", ui-sans-serif, system-ui, sans-serif;

  --maxw: 1140px;
  --radius: 14px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* Ambient gradient wash */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(60% 50% at 20% -5%, rgba(109, 94, 246, 0.16), transparent 60%),
    radial-gradient(50% 45% at 95% 0%, rgba(34, 211, 238, 0.10), transparent 55%);
  pointer-events: none;
}

a { color: inherit; text-decoration: none; }

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0;
}

p { margin: 0; }

.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Eyebrow ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 22px;
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  border-radius: 2px;
  background: var(--grad);
}

.grad-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ============================================================
   Header
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(14px);
  background: rgba(10, 10, 15, 0.72);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease);
}
.site-header.scrolled { border-bottom-color: var(--line); }

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}
.brand .mark {
  width: 26px;
  height: 26px;
  flex: none;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 34px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-links a {
  font-size: 0.94rem;
  color: var(--muted);
  transition: color 0.2s var(--ease);
  position: relative;
}
.nav-links a:hover,
.nav-links a[aria-current="page"] { color: var(--text); }
/* button links keep their own color, not the muted nav-link color */
.nav-links a.btn { color: var(--text); }
.nav-links a.btn-primary { color: #FFFFFF; }
.nav-links a[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -6px;
  height: 2px;
  border-radius: 2px;
  background: var(--grad);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.94rem;
  padding: 11px 20px;
  border-radius: 10px;
  border: 1px solid var(--line);
  color: var(--text);
  transition: transform 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
  cursor: pointer;
}
.btn:hover { transform: translateY(-1px); border-color: var(--indigo); }
.btn-primary {
  border: none;
  background: linear-gradient(120deg, #6D5EF6 0%, #7C6CF8 55%, #5A8FF0 100%);
  color: #FFFFFF;
  font-weight: 600;
  box-shadow: 0 8px 30px -10px rgba(109, 94, 246, 0.7);
}
.btn-primary:hover {
  background: linear-gradient(120deg, #7A6CF8 0%, #6D5EF6 55%, #4F86EE 100%);
  box-shadow: 0 12px 38px -8px rgba(109, 94, 246, 0.6);
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--line);
  border-radius: 8px;
  width: 42px; height: 40px;
  color: var(--text);
  cursor: pointer;
  font-size: 1.2rem;
}

/* ============================================================
   Hero
   ============================================================ */
.hero {
  position: relative;
  padding: 96px 0 88px;
  overflow: hidden;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
}
.hero h1 {
  font-size: clamp(2.6rem, 6vw, 4.3rem);
  margin-bottom: 24px;
}
.hero .lede {
  font-size: 1.18rem;
  color: var(--muted);
  max-width: 34ch;
  margin-bottom: 36px;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

.synapse-shell {
  position: relative;
  aspect-ratio: 1 / 1;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    radial-gradient(70% 70% at 50% 40%, rgba(109,94,246,0.08), transparent 70%),
    var(--bg-elev);
  overflow: hidden;
}
.synapse-shell canvas { display: block; width: 100%; height: 100%; }
.synapse-tag {
  position: absolute;
  bottom: 14px; left: 16px;
  font-family: var(--font-display);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted-dim);
}

/* ---------- Trust strip ---------- */
.strip {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 26px 0;
}
.strip .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  flex-wrap: wrap;
}
.strip-label {
  font-family: var(--font-display);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted-dim);
}
.strip-stats { display: flex; gap: 48px; flex-wrap: wrap; }
.stat .n {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 600;
}
.stat .l { font-size: 0.86rem; color: var(--muted); }

/* ============================================================
   Sections
   ============================================================ */
section { position: relative; }
.section-pad { padding: 92px 0; }

.section-head { max-width: 620px; margin-bottom: 54px; }
.section-head h2 {
  font-size: clamp(1.9rem, 3.6vw, 2.7rem);
  margin-bottom: 16px;
}
.section-head p { color: var(--muted); font-size: 1.08rem; }

/* ---------- Cards ---------- */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 30px 28px;
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease);
}
.card:hover { transform: translateY(-4px); border-color: #33334a; }
.card .ic {
  width: 40px; height: 40px;
  border-radius: 10px;
  background: rgba(109, 94, 246, 0.12);
  display: grid;
  place-items: center;
  margin-bottom: 20px;
}
.card .ic svg { width: 21px; height: 21px; stroke: var(--cyan); }
.card h3 { font-size: 1.18rem; margin-bottom: 10px; }
.card p { color: var(--muted); font-size: 0.98rem; }

/* ---------- Product feature ---------- */
.feature {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.feature.rev { direction: rtl; }
.feature.rev > * { direction: ltr; }
.feature-visual {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    radial-gradient(80% 60% at 30% 20%, rgba(34,211,238,0.1), transparent 70%),
    var(--bg-elev);
  aspect-ratio: 4 / 3;
  display: grid;
  place-items: center;
  padding: 30px;
}
.feature h2 { font-size: clamp(1.8rem, 3.2vw, 2.4rem); margin-bottom: 18px; }
.feature p { color: var(--muted); margin-bottom: 22px; }
.checks { list-style: none; margin: 0 0 28px; padding: 0; display: grid; gap: 12px; }
.checks li { display: flex; gap: 12px; align-items: flex-start; font-size: 0.98rem; }
.checks svg { flex: none; width: 20px; height: 20px; stroke: var(--cyan); margin-top: 2px; }

/* Phone mock for StudyBuddy */
.phone {
  width: 190px;
  aspect-ratio: 9 / 19;
  border-radius: 28px;
  border: 1px solid var(--line);
  background: var(--bg-card);
  padding: 14px 12px;
  box-shadow: 0 30px 60px -30px rgba(0,0,0,0.8);
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.phone .row {
  height: 12px;
  border-radius: 6px;
  background: var(--line);
}
.phone .row.grad { background: var(--grad); width: 70%; }
.phone .bubble {
  border-radius: 12px;
  padding: 12px;
  font-size: 0.72rem;
  line-height: 1.5;
  font-family: var(--font-display);
}
.phone .bubble.q { background: var(--bg-elev); color: var(--muted); align-self: flex-end; max-width: 85%; }
.phone .bubble.a { background: rgba(109,94,246,0.14); color: var(--text); border: 1px solid rgba(109,94,246,0.3); max-width: 90%; }

/* ---------- Roadmap ---------- */
.roadmap { display: grid; gap: 0; }
.rm-item {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 30px;
  padding: 26px 0;
  border-top: 1px solid var(--line);
  align-items: baseline;
}
.rm-item:last-child { border-bottom: 1px solid var(--line); }
.rm-when {
  font-family: var(--font-display);
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--cyan);
}
.rm-item h3 { font-size: 1.22rem; margin-bottom: 8px; }
.rm-item p { color: var(--muted); font-size: 0.98rem; max-width: 62ch; }
.rm-status {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 3px 10px;
  border-radius: 20px;
  border: 1px solid var(--line);
  color: var(--muted);
  margin-left: 10px;
  vertical-align: middle;
}
.rm-status.live { color: var(--cyan); border-color: rgba(34,211,238,0.4); }

/* ---------- CTA band ---------- */
.cta-band {
  border: 1px solid var(--line);
  border-radius: 20px;
  background:
    radial-gradient(70% 120% at 100% 0%, rgba(34,211,238,0.12), transparent 60%),
    radial-gradient(60% 120% at 0% 100%, rgba(109,94,246,0.16), transparent 60%),
    var(--bg-elev);
  padding: 60px 48px;
  text-align: center;
}
.cta-band h2 { font-size: clamp(1.8rem, 3.4vw, 2.6rem); margin-bottom: 16px; }
.cta-band p { color: var(--muted); max-width: 46ch; margin: 0 auto 30px; }

/* ============================================================
   About / values
   ============================================================ */
.lede-block {
  max-width: 760px;
}
.lede-block p { font-size: 1.24rem; line-height: 1.6; margin-bottom: 22px; }
.lede-block p.big {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  line-height: 1.3;
  color: var(--text);
  letter-spacing: -0.01em;
}

.value-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.value {
  background: var(--bg);
  padding: 34px 30px;
}
.value .k {
  font-family: var(--font-display);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted-dim);
  margin-bottom: 14px;
}
.value h3 { font-size: 1.3rem; margin-bottom: 10px; }
.value p { color: var(--muted); font-size: 0.98rem; }

/* ============================================================
   Contact
   ============================================================ */
.contact-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 56px;
  align-items: start;
}
.contact-info h2 { font-size: clamp(1.9rem, 3.4vw, 2.6rem); margin-bottom: 18px; }
.contact-info p { color: var(--muted); margin-bottom: 28px; }
.contact-line {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 0;
  border-top: 1px solid var(--line);
}
.contact-line:last-child { border-bottom: 1px solid var(--line); }
.contact-line svg { width: 18px; height: 18px; stroke: var(--cyan); flex: none; }
.contact-line span { font-size: 0.96rem; }
.contact-line .k { color: var(--muted-dim); width: 74px; font-family: var(--font-display); font-size: 0.8rem; letter-spacing: 0.06em; text-transform: uppercase; }

form.card { padding: 32px; }
.field { margin-bottom: 20px; }
.field label {
  display: block;
  font-family: var(--font-display);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  margin-bottom: 8px;
  color: var(--muted);
}
.field input,
.field textarea {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 13px 14px;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 0.98rem;
  transition: border-color 0.2s var(--ease);
}
.field input:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--indigo);
  box-shadow: 0 0 0 3px rgba(109, 94, 246, 0.15);
}
.field textarea { resize: vertical; min-height: 120px; }
.form-note { font-size: 0.84rem; color: var(--muted-dim); margin-top: 6px; }

/* ============================================================
   Page header (interior pages)
   ============================================================ */
.page-head { padding: 84px 0 20px; }
.page-head h1 { font-size: clamp(2.3rem, 5vw, 3.6rem); margin-bottom: 18px; }
.page-head p { color: var(--muted); font-size: 1.15rem; max-width: 52ch; }

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  border-top: 1px solid var(--line);
  margin-top: 40px;
  padding: 56px 0 40px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 44px;
}
.footer-grid .brand { margin-bottom: 16px; }
.footer-blurb { color: var(--muted); font-size: 0.95rem; max-width: 36ch; }
.footer-col h4 {
  font-family: var(--font-display);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted-dim);
  margin: 0 0 16px;
}
.footer-col a {
  display: block;
  color: var(--muted);
  font-size: 0.95rem;
  padding: 5px 0;
  transition: color 0.2s var(--ease);
}
.footer-col a:hover { color: var(--text); }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 26px;
  border-top: 1px solid var(--line);
  color: var(--muted-dim);
  font-size: 0.86rem;
  flex-wrap: wrap;
  gap: 12px;
}

/* ============================================================
   Reveal-on-scroll
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal.in { opacity: 1; transform: none; }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 44px; }
  .synapse-shell { max-width: 420px; }
  .feature, .contact-grid { grid-template-columns: 1fr; gap: 36px; }
  .feature.rev { direction: ltr; }
  .grid-3 { grid-template-columns: 1fr; }
  .value-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }

  .nav-links {
    position: fixed;
    inset: 68px 0 auto 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--bg-elev);
    border-bottom: 1px solid var(--line);
    padding: 8px 24px 20px;
    transform: translateY(-140%);
    transition: transform 0.35s var(--ease);
  }
  .nav-links.open { transform: none; }
  .nav-links li { border-top: 1px solid var(--line); }
  .nav-links a { display: block; padding: 15px 0; }
  .nav-links a[aria-current="page"]::after { display: none; }
  .nav-links .btn { margin-top: 14px; text-align: center; justify-content: center; }
  .nav-toggle { display: block; }
  .strip-stats { gap: 30px; }
}

@media (max-width: 520px) {
  .footer-grid { grid-template-columns: 1fr; }
  .cta-band, form.card { padding: 32px 22px; }
  .rm-item { grid-template-columns: 1fr; gap: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; }
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* Accessibility: visible focus */
a:focus-visible, button:focus-visible,
input:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 4px;
}