/* Pixel Neural AI — Neural Lattice Design System */

@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@500&family=Inter:wght@400;600&family=Outfit:wght@600;700&display=swap');

:root {
  --ink: #0E0B14;
  --plum: #1A1424;
  --mist: #ECEAF2;
  --orchid: #B44BFF;
  --mint: #3DFFC8;
  --slate: #8B8794;
  --orchid-hover: #c66dff;
  --max-width: 1200px;
  --section-pad: clamp(4rem, 8vw, 8.75rem);
  --transition: 0.35s ease;
}

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

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

body {
  margin: 0;
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 1.0625rem;
  line-height: 1.65;
  background: var(--ink);
  color: var(--mist);
}

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

a {
  color: currentColor;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

a:hover { opacity: 0.85; }

h1, h2, h3, h4 {
  font-family: 'Outfit', system-ui, sans-serif;
  font-weight: 700;
  line-height: 1.15;
  margin: 0 0 1rem;
}

h1 { font-size: clamp(2.25rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.75rem, 3.5vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 2.5vw, 1.5rem); font-weight: 600; }

p { margin: 0 0 1.25rem; }

ul, ol { margin: 0 0 1.25rem; padding-left: 1.4rem; }

/* Surface system */
.surface-ink { background-color: var(--ink); color: var(--mist); }
.surface-mist { background-color: var(--mist); color: var(--ink); }
.surface-plum { background-color: var(--plum); color: var(--mist); }
.surface-orchid { background-color: var(--orchid); color: var(--ink); }

.container {
  width: min(100% - 2.5rem, var(--max-width));
  margin-inline: auto;
}

.container.narrow { max-width: 760px; }
.container.wide { max-width: 1400px; }

/* Typography utilities */
.eyebrow {
  font-family: 'IBM Plex Mono', monospace;
  font-weight: 500;
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--orchid);
  margin-bottom: 1rem;
}

.surface-mist .eyebrow { color: var(--orchid); }

.text-mint { color: var(--mint); }

.mono-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--slate);
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  transition: background-color var(--transition), box-shadow var(--transition), backdrop-filter var(--transition);
}

.site-header--transparent {
  background: transparent;
}

.site-header--solid,
.site-header.is-sticky {
  background: rgba(236, 234, 242, 0.96);
  color: var(--ink);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 rgba(14, 11, 20, 0.08);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(100% - 2.5rem, var(--max-width));
  margin-inline: auto;
  padding: 1.1rem 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  font-size: 1.05rem;
}

.logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  background: var(--ink);
  color: var(--orchid);
  font-size: 0.75rem;
  border-radius: 2px;
}

.site-header--solid .logo-mark,
.site-header.is-sticky .logo-mark {
  background: var(--plum);
}

.site-nav ul {
  display: flex;
  gap: 1.75rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav a {
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 600;
}

.site-nav a[aria-current="page"] {
  text-decoration: underline;
  text-decoration-color: var(--orchid);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: 0.5rem;
  cursor: pointer;
  color: inherit;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: currentColor;
  transition: transform var(--transition);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.6rem;
  font-family: 'Inter', sans-serif;
  font-weight: 600;
  font-size: 0.9375rem;
  text-decoration: none;
  border-radius: 2px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: filter var(--transition), box-shadow var(--transition);
}

.btn-primary {
  background: var(--orchid);
  color: var(--ink);
  border-color: var(--orchid);
}

.btn-primary:hover {
  filter: brightness(1.08);
  box-shadow: 0 4px 20px rgba(180, 75, 255, 0.35);
  opacity: 1;
}

.btn-secondary {
  background: transparent;
  color: currentColor;
  border-color: currentColor;
}

.btn-secondary:hover {
  filter: brightness(1.15);
  opacity: 1;
}

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 2rem;
}

/* Lattice Frame Hero */
.hero-lattice {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  overflow: hidden;
}

.hero-lattice__bg {
  position: absolute;
  inset: 0;
  background-image: url('/images/pixelneuralai-01-hero-imaging-studio.jpg');
  background-size: cover;
  background-position: center;
  animation: kenBurns 28s ease-in-out infinite alternate;
}

@keyframes kenBurns {
  from { transform: scale(1); }
  to { transform: scale(1.04); }
}

.hero-lattice__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(14, 11, 20, 0.55) 0%,
    rgba(14, 11, 20, 0.72) 45%,
    rgba(14, 11, 20, 0.92) 100%
  );
}

.hero-lattice__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(180, 75, 255, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(180, 75, 255, 0.08) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}

.hero-lattice__trace {
  position: absolute;
  bottom: 33%;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--mint), transparent);
  opacity: 0.5;
}

.hero-lattice__topbar {
  position: relative;
  z-index: 2;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 6.5rem 0 1rem;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  border-bottom: 1px solid rgba(236, 234, 242, 0.25);
  width: min(100% - 2.5rem, var(--max-width));
  margin-inline: auto;
}

.hero-lattice__topbar-right { color: var(--orchid); }

.hero-lattice__content {
  position: relative;
  z-index: 2;
  padding: 3rem 0 2rem;
  width: min(100% - 2.5rem, var(--max-width));
  margin-inline: auto;
}

.hero-lattice__content h1 {
  font-size: clamp(2.875rem, 6.5vw, 5.25rem);
  max-width: 14ch;
  margin-bottom: 1.5rem;
}

.hero-lattice__sub {
  max-width: 34rem;
  font-size: 1.125rem;
  opacity: 0.88;
  margin-bottom: 0;
}

.hero-lattice__trust {
  position: relative;
  z-index: 2;
  padding: 1.25rem 0 2rem;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--slate);
  border-top: 1px solid rgba(236, 234, 242, 0.15);
  width: min(100% - 2.5rem, var(--max-width));
  margin-inline: auto;
}

/* Sections */
.section {
  padding: var(--section-pad) 0;
  position: relative;
}

.section--lattice::before {
  content: '';
  position: absolute;
  top: 2rem;
  right: 2rem;
  width: 48px;
  height: 48px;
  border-top: 1px solid var(--orchid);
  border-right: 1px solid var(--orchid);
  opacity: 0.4;
}

.hairline {
  border: none;
  border-top: 1px solid rgba(180, 75, 255, 0.3);
  margin: 2.5rem 0;
}

.surface-mist .hairline { border-color: rgba(14, 11, 20, 0.12); }

/* Grid layouts */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2.5rem;
  align-items: start;
}

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

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

/* Cards */
.card {
  padding: 2rem;
  border: 1px solid rgba(180, 75, 255, 0.25);
  border-radius: 2px;
}

.surface-mist .card {
  background: rgba(255, 255, 255, 0.6);
  border-color: rgba(14, 11, 20, 0.1);
}

.surface-plum .card,
.surface-ink .card {
  background: rgba(236, 234, 242, 0.04);
}

.card__num {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 3rem;
  font-weight: 500;
  opacity: 0.12;
  line-height: 1;
  margin-bottom: 0.5rem;
}

/* Photo frames */
.photo-frame {
  position: relative;
  overflow: hidden;
  border-radius: 2px;
  border: 1px solid rgba(180, 75, 255, 0.3);
}

.photo-frame img { width: 100%; }

.photo-frame--frosted::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(236, 234, 242, 0.07);
  pointer-events: none;
}

.photo-caption {
  font-size: 0.875rem;
  color: var(--slate);
  margin-top: 0.75rem;
}

.surface-mist .photo-caption { color: #5a5668; }

/* Metrics */
.metric-trio {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  text-align: center;
  padding: 2.5rem 0;
}

.metric-trio__value {
  font-family: 'Outfit', sans-serif;
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--orchid);
  display: block;
}

.metric-trio__label {
  font-size: 0.875rem;
  color: var(--slate);
}

.surface-mist .metric-trio__value { color: var(--orchid); }

/* Stages */
.stages {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.stage-item {
  padding: 1.5rem;
  border-left: 2px solid var(--orchid);
}

.stage-item__step {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--orchid);
  margin-bottom: 0.5rem;
}

/* Capabilities rail */
.cap-rail {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.cap-item {
  padding: 1.75rem;
  border-top: 2px solid var(--orchid);
  position: relative;
}

.cap-item__px {
  position: absolute;
  top: 0.5rem;
  right: 1rem;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 2.5rem;
  opacity: 0.08;
}

/* Case studies */
.case-card {
  padding: 2rem;
  border: 1px solid rgba(180, 75, 255, 0.2);
  margin-bottom: 2rem;
}

.case-card__tag {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--mint);
  margin-bottom: 0.75rem;
}

/* FAQ */
.faq-list { list-style: none; padding: 0; margin: 0; }

.faq-item {
  border-bottom: 1px solid rgba(180, 75, 255, 0.2);
  padding: 1.5rem 0;
}

.faq-item summary {
  font-family: 'Outfit', sans-serif;
  font-weight: 600;
  font-size: 1.125rem;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary::after {
  content: '+';
  font-family: 'IBM Plex Mono', monospace;
  color: var(--orchid);
  flex-shrink: 0;
}

.faq-item[open] summary::after { content: '−'; }

.faq-item__answer {
  padding-top: 1rem;
  color: inherit;
  opacity: 0.9;
}

/* Page hero (inner pages) */
.page-hero {
  padding: 8rem 0 3.5rem;
}

.page-hero h1 { max-width: 20ch; }

/* Forms */
.form-group { margin-bottom: 1.5rem; }

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.4rem;
  font-size: 0.9375rem;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.85rem 1rem;
  font-family: 'Inter', sans-serif;
  font-size: 1rem;
  border: 1px solid rgba(14, 11, 20, 0.2);
  border-radius: 2px;
  background: #fff;
  color: var(--ink);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: 2px solid var(--orchid);
  outline-offset: 2px;
}

.form-hint {
  font-size: 0.8125rem;
  color: var(--slate);
  margin-top: 0.35rem;
}

.form-hint.is-error { color: #c42b2b; }

.form-hint.is-valid { color: #1a7a4a; }

.checkbox-group {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.checkbox-group input { width: auto; margin-top: 0.25rem; }

.hp-field {
  position: absolute;
  left: -9999px;
  opacity: 0;
  height: 0;
  overflow: hidden;
}

/* Legal prose */
.legal-prose h2 {
  margin-top: 2.5rem;
  font-size: 1.5rem;
}

.legal-prose h3 {
  margin-top: 1.75rem;
  font-size: 1.2rem;
}

.legal-prose p,
.legal-prose li { font-size: 1rem; }

/* Footer */
.site-footer {
  padding: 4rem 0 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1.5fr 1fr;
  gap: 2.5rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid rgba(236, 234, 242, 0.12);
}

.footer-name {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  font-size: 1.125rem;
  margin-bottom: 0.75rem;
}

.footer-legal ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-legal li { margin-bottom: 0.5rem; }

.footer-legal a { text-decoration: none; }

.footer-notes {
  padding-top: 2rem;
  font-size: 0.8125rem;
  color: var(--slate);
}

.footer-disclaimer {
  margin-top: 1.25rem;
  line-height: 1.55;
}

.footer-copy {
  margin-top: 1.5rem;
  font-size: 0.75rem;
}

/* CTA band */
.cta-band {
  text-align: center;
  padding: var(--section-pad) 0;
}

.cta-band h2 { margin-bottom: 1rem; }

/* Signal trace underline */
.signal-trace {
  display: inline-block;
  position: relative;
}

.signal-trace::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--orchid), var(--mint));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.8s ease;
}

.signal-trace.is-drawn::after,
.no-js .signal-trace::after {
  transform: scaleX(1);
}

/* Reveal animations */
.js .reveal {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.js .reveal:not(.is-visible) {
  opacity: 0;
  transform: translateY(16px);
}

.js .reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Cookie banner */
.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 2000;
  padding: 1.5rem;
  background: var(--plum);
  color: var(--mist);
  border-top: 1px solid rgba(180, 75, 255, 0.3);
  box-shadow: 0 -8px 32px rgba(0, 0, 0, 0.4);
}

.cookie-banner[hidden] { display: none; }

.cookie-banner__inner {
  width: min(100%, var(--max-width));
  margin-inline: auto;
}

.cookie-banner__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1rem;
}

.cookie-banner__actions .btn {
  padding: 0.65rem 1.2rem;
  font-size: 0.875rem;
}

.cookie-customise {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(236, 234, 242, 0.15);
}

.cookie-customise[hidden] { display: none; }

.cookie-customise label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}

/* Service blocks */
.service-block {
  margin-bottom: 3rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid rgba(180, 75, 255, 0.15);
}

.service-block:last-child { border-bottom: none; }

.price-range {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.875rem;
  color: var(--orchid);
  margin-top: 1rem;
}

/* Contact layout */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 3rem;
  align-items: start;
}

.contact-block address {
  font-style: normal;
  line-height: 1.7;
}

/* 404 */
.error-page {
  min-height: 70vh;
  display: flex;
  align-items: center;
  padding: 8rem 0 4rem;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .hero-lattice__bg { animation: none; }

  .js .reveal:not(.is-visible) {
    opacity: 1;
    transform: none;
  }
}

/* Responsive */
@media (max-width: 960px) {
  .grid-2, .grid-3, .grid-4, .stages, .cap-rail, .metric-trio,
  .footer-grid, .contact-layout {
    grid-template-columns: 1fr;
  }

  .stages { grid-template-columns: repeat(2, 1fr); }
  .cap-rail { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .nav-toggle { display: flex; }

  .site-nav {
    position: fixed;
    top: 0;
    right: 0;
    width: min(85vw, 320px);
    height: 100vh;
    background: var(--mist);
    color: var(--ink);
    padding: 5rem 2rem 2rem;
    transform: translateX(100%);
    transition: transform var(--transition);
    box-shadow: -4px 0 24px rgba(0, 0, 0, 0.15);
  }

  .site-nav.is-open { transform: translateX(0); }

  .site-nav ul {
    flex-direction: column;
    gap: 1.25rem;
  }

  .hero-lattice { min-height: 82vh; }

  .stages { grid-template-columns: 1fr; }

  .metric-trio { grid-template-columns: 1fr; gap: 1.5rem; }
}

@media (max-width: 480px) {
  .btn-group { flex-direction: column; }
  .btn { width: 100%; }
}