/* CogniVertex — Site A Design System */
:root {
  --color-dark: #0A1628;
  --color-light: #F4F7FB;
  --color-accent: #3B82F6;
  --color-accent-deep: #0A1628;
  --color-slate: #1E293B;
  --font-headline: 'Inter', system-ui, sans-serif;
  --font-body: 'Source Sans 3', system-ui, sans-serif;
  --radius-card: 12px;
  --border-card: 3px solid var(--color-accent);
  --header-height: 64px;
  --sidebar-width: 280px;
  --transition: 0.3s ease;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--color-dark);
  background: var(--color-light);
  overflow-x: hidden;
}

body.nav-open { overflow: hidden; }

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

a { color: var(--color-accent); text-decoration: none; transition: opacity var(--transition); }
a:hover { opacity: 0.85; }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-headline);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 0.75em;
}

h1 { font-size: clamp(2rem, 5vw, 3rem); }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.25rem); }
h3 { font-size: clamp(1.15rem, 2.5vw, 1.5rem); }

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

ul, ol { margin-bottom: 1em; padding-left: 1.5em; }
li { margin-bottom: 0.4em; }

/* Surface classes */
.surface-dark { background: var(--color-dark); color: var(--color-light); }
.surface-dark a { color: #93C5FD; }
.surface-light { background: var(--color-light); color: var(--color-dark); }
.surface-accent { background: var(--color-accent-deep); color: #fff; }
.surface-accent a { color: #fff; text-decoration: underline; }
.surface-accent h1,
.surface-accent h2,
.surface-accent h3,
.surface-accent h4,
.surface-accent .faq-item h3 { color: #fff; }
.surface-slate { background: var(--color-slate); color: var(--color-light); }
.surface-slate a { color: #93C5FD; }

/* Layout */
.container { width: min(1140px, 92%); margin: 0 auto; }
.section { padding: 5rem 0; }
.section-sm { padding: 3rem 0; }

/* Fixed header */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  background: rgba(10, 22, 40, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.site-logo {
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-light) !important;
  text-decoration: none;
  opacity: 1 !important;
}

.header-actions { display: flex; align-items: center; gap: 1.25rem; }

.header-contact {
  font-family: var(--font-headline);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-light) !important;
  opacity: 1 !important;
}

.nav-toggle {
  background: none;
  border: none;
  cursor: pointer;
  width: 36px;
  height: 36px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  padding: 0;
}

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

.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Left sidebar nav */
.nav-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 1001;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}

.nav-backdrop.is-visible { opacity: 1; visibility: visible; }

.sidebar-nav {
  position: fixed;
  top: 0; left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background: var(--color-dark);
  z-index: 1002;
  transform: translateX(-100%);
  transition: transform var(--transition);
  padding: calc(var(--header-height) + 1.5rem) 1.5rem 2rem;
  overflow-y: auto;
}

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

.sidebar-nav ul { list-style: none; padding: 0; }
.sidebar-nav li { margin-bottom: 0.25rem; }
.sidebar-nav a {
  display: block;
  padding: 0.75rem 0;
  font-family: var(--font-headline);
  font-weight: 500;
  font-size: 1rem;
  color: var(--color-light) !important;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  opacity: 1 !important;
}
.sidebar-nav a:hover { color: var(--color-accent) !important; }

/* Main offset */
main { padding-top: var(--header-height); }

/* Hero Pattern I — 58/42 diagonal editorial split */
.hero-editorial {
  min-height: 94vh;
  display: grid;
  grid-template-columns: 58fr 42fr;
  position: relative;
  overflow: hidden;
}

.hero-editorial__content {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 4rem 3rem 4rem clamp(1.5rem, 5vw, 4rem);
  background: var(--color-dark);
  color: var(--color-light);
  position: relative;
  z-index: 2;
}

.hero-editorial__content h1 { margin-bottom: 1rem; }
.hero-editorial__content .lead {
  font-size: 1.2rem;
  opacity: 0.9;
  margin-bottom: 2rem;
  max-width: 36ch;
}

.hero-editorial__photo {
  position: relative;
  min-height: 50vh;
}

.hero-editorial__photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  clip-path: polygon(12% 0, 100% 0, 100% 100%, 0 100%);
}

@media (max-width: 768px) {
  .hero-editorial {
    grid-template-columns: 1fr;
    min-height: auto;
  }
  .hero-editorial__photo { min-height: 40vh; order: -1; }
  .hero-editorial__photo img { clip-path: none; }
  .hero-editorial__content { padding: 3rem 1.5rem; min-height: 50vh; }
}

/* Cards */
.card {
  background: #fff;
  border-radius: var(--radius-card);
  border-left: var(--border-card);
  padding: 1.75rem;
  box-shadow: 0 2px 12px rgba(10,22,40,0.06);
}

.surface-dark .card,
.surface-slate .card {
  background: rgba(255,255,255,0.05);
  color: var(--color-light);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.card img {
  border-radius: 8px;
  margin-bottom: 1rem;
}

/* CTA pill */
.cta-pill {
  display: inline-block;
  padding: 0.85rem 2rem;
  border-radius: 999px;
  background: linear-gradient(135deg, #3B82F6 0%, #2563EB 50%, #1D4ED8 100%);
  color: #fff !important;
  font-family: var(--font-headline);
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  border: none;
  cursor: pointer;
  opacity: 1 !important;
  transition: transform var(--transition), box-shadow var(--transition);
}

.cta-pill:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(59,130,246,0.35);
  opacity: 1 !important;
}

/* Metrics */
.metrics-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 2rem;
  text-align: center;
}

.metric-value {
  font-family: var(--font-headline);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 0.5rem;
}

.surface-dark .metric-value,
.surface-slate .metric-value { color: #93C5FD; }

.metric-label { font-size: 0.95rem; opacity: 0.85; }

/* FAQ two-column static split */
.faq-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem 3rem;
}

.faq-item { margin-bottom: 0; }
.faq-item h3 { font-size: 1.1rem; margin-bottom: 0.5rem; }
.surface-light .faq-item h3 { color: var(--color-accent); }
.surface-accent .faq-item h3 { color: #fff; }
.surface-dark .faq-item h3,
.surface-slate .faq-item h3 { color: #93C5FD; }

@media (max-width: 768px) {
  .faq-grid { grid-template-columns: 1fr; }
}

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

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  margin-bottom: 3rem;
}

.footer-col h4 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 1rem;
  opacity: 0.7;
}

.footer-col ul { list-style: none; padding: 0; }
.footer-col li { margin-bottom: 0.5rem; }
.footer-col a { font-size: 0.95rem; }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.875rem;
  opacity: 0.75;
}

@media (max-width: 900px) {
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 500px) {
  .footer-grid { grid-template-columns: 1fr; }
}

/* Page hero (inner pages) */
.page-hero {
  padding: 4rem 0 3rem;
  text-align: center;
}

.page-hero .lead {
  font-size: 1.15rem;
  max-width: 60ch;
  margin: 0 auto;
  opacity: 0.9;
}

/* Split layout */
.split-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

@media (max-width: 768px) {
  .split-layout { grid-template-columns: 1fr; }
}

/* Contact form */
.contact-form { max-width: 560px; }
.form-group { margin-bottom: 1.25rem; }
.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.4rem;
  font-size: 0.95rem;
}
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid #CBD5E1;
  border-radius: 8px;
  font-family: var(--font-body);
  font-size: 1rem;
  background: #fff;
}
.form-group textarea { min-height: 140px; resize: vertical; }
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 1px;
}
.form-check { display: flex; align-items: flex-start; gap: 0.6rem; margin-bottom: 1.25rem; }
.form-check input { margin-top: 0.3rem; }
.hp-field { position: absolute; left: -9999px; opacity: 0; height: 0; width: 0; overflow: hidden; }

.alert-success {
  background: #DCFCE7;
  color: #166534;
  padding: 1rem 1.25rem;
  border-radius: var(--radius-card);
  border-left: 3px solid #22C55E;
  margin-bottom: 1.5rem;
}

/* Legal prose */
.legal-prose { max-width: 780px; margin: 0 auto; }
.legal-prose h2 { margin-top: 2.5rem; }
.legal-prose h2:first-child { margin-top: 0; }

/* Module table */
.module-table { width: 100%; border-collapse: collapse; margin: 2rem 0; }
.module-table th,
.module-table td {
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid rgba(0,0,0,0.08);
}
.surface-dark .module-table th,
.surface-dark .module-table td,
.surface-slate .module-table th,
.surface-slate .module-table td {
  border-color: rgba(255,255,255,0.1);
}
.module-table th { font-family: var(--font-headline); font-weight: 600; }

/* AI disclaimer */
.ai-disclaimer {
  font-size: 0.85rem;
  opacity: 0.75;
  font-style: italic;
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(0,0,0,0.08);
}
.surface-dark .ai-disclaimer,
.surface-slate .ai-disclaimer { border-color: rgba(255,255,255,0.1); }

/* Cookie banner */
.cookie-banner {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  z-index: 2000;
  background: var(--color-dark);
  color: var(--color-light);
  padding: 1.25rem 1.5rem;
  box-shadow: 0 -4px 24px rgba(0,0,0,0.2);
  transform: translateY(100%);
  transition: transform var(--transition);
}

.cookie-banner.is-visible { transform: translateY(0); }

.cookie-banner__inner {
  max-width: 1140px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.cookie-banner p { margin: 0; font-size: 0.9rem; max-width: 60ch; }

.cookie-banner__actions { display: flex; flex-wrap: wrap; gap: 0.6rem; }

.cookie-btn {
  padding: 0.5rem 1.1rem;
  border-radius: 6px;
  font-family: var(--font-headline);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid rgba(255,255,255,0.2);
  background: transparent;
  color: var(--color-light);
  transition: var(--transition);
}

.cookie-btn--accept { background: var(--color-accent); border-color: var(--color-accent); }
.cookie-btn--accept:hover { background: #2563EB; }
.cookie-btn:hover { opacity: 0.9; }

.cookie-modal {
  position: fixed;
  inset: 0;
  z-index: 2001;
  background: rgba(0,0,0,0.6);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.cookie-modal.is-visible { display: flex; }

.cookie-modal__box {
  background: #fff;
  color: var(--color-dark);
  border-radius: var(--radius-card);
  padding: 2rem;
  max-width: 480px;
  width: 100%;
}

.cookie-modal__box h3 { margin-bottom: 1rem; }
.cookie-modal__box label { display: flex; align-items: center; gap: 0.5rem; margin-bottom: 0.75rem; }

/* 404 */
.error-page {
  min-height: 70vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 3rem 1.5rem;
}

.error-page h1 { font-size: 6rem; color: var(--color-accent); line-height: 1; }

/* Scroll reveal */
.js .reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.no-js .reveal { opacity: 1; transform: none; }

/* Utility */
.text-center { text-align: center; }
.mb-2 { margin-bottom: 2rem; }
.mt-2 { margin-top: 2rem; }
.img-rounded { border-radius: var(--radius-card); }

.img-compact {
  max-width: min(420px, 85%);
  width: 100%;
  height: auto;
}