/* Alítheia AI Consulting — bleeding-edge visual */

:root {
  --bg: #050712;
  --bg-elevated: #0a0e1a;
  --bg-card: #0d1220;
  --text: #e8eaed;
  --text-muted: #8b92a0;
  --accent: #3b82f6;
  --accent-glow: rgba(59, 130, 246, 0.45);
  --accent-dim: rgba(59, 130, 246, 0.2);
  --accent-gold: #c9a227;
  --accent-gold-glow: rgba(201, 162, 39, 0.35);
  --border: #1e2738;
  --radius: 12px;
  --radius-frame: 16px;
  --font-serif: "Cormorant Garamond", Georgia, serif;
  --font-sans: "Outfit", system-ui, sans-serif;
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;
  --max-width: 720px;
  --max-width-wide: 1100px;
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --reveal-duration: 0.9s;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  font-weight: 400;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* Grid + dot network background (premium template quality) */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    radial-gradient(circle at 20% 30%, rgba(59, 130, 246, 0.06) 0%, transparent 40%),
    radial-gradient(circle at 80% 70%, rgba(99, 102, 241, 0.04) 0%, transparent 40%),
    linear-gradient(rgba(59, 130, 246, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59, 130, 246, 0.04) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 48px 48px, 48px 48px;
  pointer-events: none;
  z-index: 0;
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  background: 
    radial-gradient(ellipse 120% 80% at 50% -10%, rgba(59, 130, 246, 0.08) 0%, transparent 45%),
    radial-gradient(ellipse 80% 50% at 50% 100%, rgba(59, 130, 246, 0.03) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
}

.container {
  width: 100%;
  max-width: var(--max-width-wide);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.container.narrow {
  max-width: var(--max-width);
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(5, 7, 18, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-sm);
  padding-bottom: var(--space-sm);
}

.logo {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
  letter-spacing: 0.02em;
  text-shadow: 0 0 24px var(--accent-dim);
  transition: text-shadow 0.2s;
}

.logo:hover {
  text-shadow: 0 0 32px var(--accent-glow);
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav-cta-first {
  order: 99;
}

.nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
  transition: color 0.2s;
}

.nav a:hover {
  color: var(--text);
}

.btn-nav {
  padding: 0.5rem 1.25rem;
  font-size: 0.875rem;
  border-radius: 8px;
  box-shadow: 0 0 24px var(--accent-glow);
}

.btn-nav:hover {
  box-shadow: 0 0 36px var(--accent-glow);
}

.menu-toggle {
  display: none;
  width: 28px;
  height: 28px;
  padding: 0;
  border: none;
  background: transparent;
  cursor: pointer;
  align-items: center;
}

.menu-toggle {
  flex-direction: column;
  justify-content: center;
  gap: 6px;
}

.menu-toggle span,
.menu-toggle::before,
.menu-toggle::after {
  display: block;
  height: 2px;
  background: var(--text);
  width: 28px;
}

.menu-toggle::before,
.menu-toggle::after {
  content: "";
}

/* Hero — template style with browser frame */
.hero {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-2xl) 0 var(--space-xl);
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(165deg, #060a14 0%, #0a0e1c 40%, #080c18 100%);
  z-index: 0;
}

.hero-bg-dots {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle at 1px 1px, rgba(59, 130, 246, 0.12) 1px, transparent 0);
  background-size: 32px 32px;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  width: 100%;
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  justify-content: center;
  margin-bottom: var(--space-xl);
}

.hero-ctas .btn {
  min-width: 140px;
}

/* Browser-frame visual (glowing data viz) */
.hero-visual-frame {
  position: relative;
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
  border-radius: var(--radius-frame);
  padding: 3px;
  background: linear-gradient(135deg, var(--border) 0%, rgba(59, 130, 246, 0.15) 50%, var(--border) 100%);
  box-shadow: 0 0 60px var(--accent-glow), 0 24px 48px rgba(0, 0, 0, 0.5);
  overflow: hidden;
}

.hero-visual-glow {
  position: absolute;
  inset: -2px;
  border-radius: calc(var(--radius-frame) + 2px);
  background: radial-gradient(ellipse 80% 50% at 50% 50%, var(--accent-glow) 0%, transparent 70%);
  filter: blur(24px);
  opacity: 0.6;
  pointer-events: none;
}

/* 3D rotating panel wrapper */
.hero-visual-frame {
  perspective: 1200px;
}

.hero-panel-3d {
  position: relative;
  transform-style: preserve-3d;
  animation: heroPanel3D 12s ease-in-out infinite;
}

@keyframes heroPanel3D {
  0%, 100% { transform: rotateY(-6deg) rotateX(2deg); }
  25%      { transform: rotateY(4deg) rotateX(-1deg); }
  50%      { transform: rotateY(6deg) rotateX(2deg); }
  75%      { transform: rotateY(-4deg) rotateX(-1deg); }
}

@media (prefers-reduced-motion: reduce) {
  .hero-panel-3d {
    animation: none;
    transform: none;
  }
}

/* Browser window chrome (traffic lights + url bar + status) */
.browser-chrome {
  position: relative;
  z-index: 2;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  padding: 10px 14px 0;
}

.browser-dots {
  display: flex;
  gap: 6px;
  margin-bottom: 10px;
}

.browser-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.browser-dot-r { background: #ff5f57; }
.browser-dot-y { background: #febc2e; }
.browser-dot-g { background: #28c840; }

.browser-url-bar {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 12px;
  margin-bottom: 8px;
}

.browser-url {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: var(--font-sans);
}

.browser-status {
  display: flex;
  align-items: center;
  gap: 8px;
  height: 4px;
  margin-bottom: 8px;
}

.browser-status-label {
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  white-space: nowrap;
}

.browser-status-progress {
  flex: 1;
  height: 100%;
  background: linear-gradient(90deg, var(--accent) 0%, var(--accent) 65%, var(--border) 65%, var(--border) 100%);
  border-radius: 2px;
}

.hero-visual-inner {
  position: relative;
  border-radius: 0 0 calc(var(--radius-frame) - 2px) calc(var(--radius-frame) - 2px);
  overflow: hidden;
  background: var(--bg-card);
}

/* Hero: your screenshot used directly */
.hero-direct-image-wrap {
  position: relative;
  width: 100%;
  min-height: 280px;
  background: var(--bg-card);
  border-radius: 0 0 calc(var(--radius-frame) - 2px) calc(var(--radius-frame) - 2px);
  overflow: hidden;
}

.hero-direct-image {
  width: 100%;
  height: auto;
  min-height: 280px;
  object-fit: cover;
  display: block;
  vertical-align: middle;
}

.hero-direct-image[src=""],
.hero-direct-image:not([src]) {
  opacity: 0;
}

.hero-direct-image-wrap:has(.hero-direct-image:not([src])) {
  background: linear-gradient(145deg, var(--bg-card) 0%, var(--bg-elevated) 100%);
}

/* Floating Alítheia — name centered on network image, faster motion */
.alitheia-float {
  position: relative;
  min-height: 42vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  perspective: 1400px;
  transform-style: preserve-3d;
  animation: alitheiaFloat3D 14s ease-in-out infinite;
}

@keyframes alitheiaFloat3D {
  0%, 100% { transform: rotateY(-8deg) rotateX(3deg); }
  25%      { transform: rotateY(6deg) rotateX(-2deg); }
  50%      { transform: rotateY(8deg) rotateX(3deg); }
  75%      { transform: rotateY(-6deg) rotateX(-2deg); }
}

.alitheia-float-bg {
  position: absolute;
  inset: 0;
  background: url("images/alitheia-float-bg.png") center / cover no-repeat;
}

.alitheia-float-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(5, 7, 24, 0.35) 0%, rgba(5, 7, 24, 0.2) 50%, rgba(5, 7, 24, 0.45) 100%);
  pointer-events: none;
}

.alitheia-float-name {
  position: relative;
  z-index: 1;
  font-family: var(--font-serif);
  font-size: clamp(3rem, 10vw, 5.5rem);
  font-weight: 500;
  color: #fff;
  margin: 0;
  letter-spacing: 0.02em;
  text-shadow:
    0 0 40px rgba(255, 255, 255, 0.45),
    0 0 80px rgba(59, 130, 246, 0.4),
    0 2px 20px rgba(0, 0, 0, 0.4);
  animation: alitheiaFloat 2s ease-in-out infinite;
}

@keyframes alitheiaFloat {
  0%, 100% { transform: translateY(0) scale(1); opacity: 0.95; }
  50%      { transform: translateY(-12px) scale(1.03); opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
  .alitheia-float {
    animation: none;
    transform: none;
  }
  .alitheia-float-name {
    animation: none;
  }
}

/* Hero app screen — neural network / connectome viz */
.hero-app-screen {
  min-height: 300px;
  display: flex;
  align-items: stretch;
  justify-content: stretch;
  padding: 0;
}

.hero-app-bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 50% 100%, rgba(59, 130, 246, 0.1) 0%, transparent 50%),
    linear-gradient(180deg, #0a0e1a 0%, #060a12 100%);
  pointer-events: none;
}

.hero-neural-viz {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero-neural-viz svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.hero-app-overlay {
  position: absolute;
  bottom: var(--space-md);
  left: var(--space-md);
  right: var(--space-md);
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) var(--space-md);
  background: rgba(5, 7, 18, 0.85);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  backdrop-filter: blur(8px);
}

.hero-app-overlay-title {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text);
}

.hero-app-overlay-status {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.05em;
}

@media (max-width: 480px) {
  .hero-app-overlay {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .hero-video-inner {
    display: none;
  }
  .hero-visual-inner::before {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse 80% 80% at 50% 50%, var(--accent-dim) 0%, transparent 60%),
      linear-gradient(180deg, var(--bg-card) 0%, var(--bg-elevated) 100%);
  }
}

.hero-video-inner {
  width: 100%;
  height: auto;
  min-height: 280px;
  object-fit: cover;
  display: block;
}

.hero-visual-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 0%, rgba(5, 7, 18, 0.4) 100%);
  pointer-events: none;
}

.hero-visual-inner.has-video-error .hero-video-inner {
  display: none;
}

.hero-visual-inner.has-video-error::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 80% at 50% 50%, var(--accent-dim) 0%, transparent 60%),
    linear-gradient(180deg, var(--bg-card) 0%, var(--bg-elevated) 100%);
  animation: gradientShift 8s ease-in-out infinite alternate;
}

@keyframes gradientShift {
  from { opacity: 1; }
  to { opacity: 0.8; }
}

/* Trusted by strip */
.trusted-by {
  width: 100%;
  padding: var(--space-lg) 0;
  margin-top: var(--space-xl);
  border-top: 1px solid var(--border);
  position: relative;
  z-index: 2;
}

.trusted-by-label {
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin: 0 0 var(--space-xs);
}

.trusted-by-text {
  font-size: 1rem;
  color: var(--text);
  margin: 0;
  font-weight: 500;
}

.hero-pronunciation {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-style: italic;
  color: var(--text-muted);
  margin: 0 0 var(--space-md);
  letter-spacing: 0.02em;
  opacity: 0;
  animation: heroReveal 0.8s var(--ease-out-expo) 0.2s forwards;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 500;
  line-height: 1.25;
  margin: 0 0 var(--space-md);
  max-width: 32ch;
  margin-left: auto;
  margin-right: auto;
  opacity: 0;
  transform: translateY(24px);
  animation: heroReveal 1s var(--ease-out-expo) 0.4s forwards;
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--text-muted);
  margin: 0 0 var(--space-lg);
  max-width: 42ch;
  margin-left: auto;
  margin-right: auto;
  opacity: 0;
  transform: translateY(20px);
  animation: heroReveal 0.9s var(--ease-out-expo) 0.65s forwards;
}

.hero-ctas .btn,
.hero-visual-frame {
  opacity: 0;
  transform: translateY(16px);
  animation: heroReveal 0.8s var(--ease-out-expo) 0.9s forwards;
}

.hero-visual-frame {
  animation-delay: 1.1s;
}

@keyframes heroReveal {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .hero-pronunciation,
  .hero-title,
  .hero-subtitle,
  .hero-ctas .btn,
  .hero-visual-frame {
    opacity: 1;
    transform: none;
    animation: none;
  }
}

/* Section transition strips (video-like bleed) */
.section-transition {
  height: 2px;
  background: linear-gradient(90deg, transparent 0%, var(--accent-dim) 20%, var(--accent) 50%, var(--accent-dim) 80%, transparent 100%);
  background-size: 200% 100%;
  animation: transitionShimmer 4s ease-in-out infinite;
  position: relative;
  z-index: 1;
}

.section-transition-video {
  height: 4px;
  background: linear-gradient(90deg, transparent, var(--accent-dim), var(--accent), var(--accent-dim), transparent);
  background-size: 300% 100%;
  animation: transitionShimmer 3s ease-in-out infinite;
  box-shadow: 0 0 20px var(--accent-glow);
}

@keyframes transitionShimmer {
  0%, 100% { background-position: 100% 0; }
  50% { background-position: 0 0; }
}

@media (prefers-reduced-motion: reduce) {
  .section-transition,
  .section-transition-video {
    animation: none;
  }
}

/* Scroll reveal */
.reveal-section {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity var(--reveal-duration) var(--ease-out-expo), transform var(--reveal-duration) var(--ease-out-expo);
}

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

@media (prefers-reduced-motion: reduce) {
  .reveal-section {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .reveal-section.is-visible {
    opacity: 1;
    transform: none;
  }
}

.reveal-section .container,
.reveal-section .container.narrow {
  transition: opacity 0.6s var(--ease-out-expo) 0.15s;
}

.reveal-section.is-visible .container {
  opacity: 1;
}

.btn {
  display: inline-block;
  padding: var(--space-sm) var(--space-lg);
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 500;
  text-decoration: none;
  border-radius: var(--radius);
  transition: background 0.2s, color 0.2s, box-shadow 0.3s var(--ease-out-expo), transform 0.3s var(--ease-out-expo);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: #2563eb;
  color: #fff;
  box-shadow: 0 0 32px var(--accent-glow);
  transform: scale(1.02);
}

.nav .btn-primary {
  color: #fff !important;
}

.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: 0 0 20px var(--accent-dim);
}

/* Focus styles — accessibility */
a:focus-visible,
button:focus-visible,
.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  box-shadow: 0 0 0 4px var(--accent-dim);
}

.logo:focus-visible {
  outline-offset: 4px;
}

.menu-toggle:focus-visible {
  outline-offset: 4px;
}

.btn-secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  border-color: var(--text-muted);
  color: var(--text);
}

.btn-one-pager {
  border-color: rgba(201, 162, 39, 0.4);
  color: var(--accent-gold);
}

.btn-one-pager:hover {
  border-color: var(--accent-gold);
  color: var(--accent-gold);
  box-shadow: 0 0 20px var(--accent-gold-glow);
}

/* Intro — graphic cards */
.intro {
  padding: var(--space-xl) 0;
  border-top: 1px solid var(--border);
}

.intro-tagline {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-muted);
  text-align: center;
  margin: 0 0 var(--space-lg);
  letter-spacing: 0.02em;
}

.intro-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.intro-card {
  position: relative;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-lg);
  text-align: center;
  transition: border-color 0.2s, box-shadow 0.2s;
  overflow: hidden;
}

.intro-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(5, 7, 18, 0.72) 0%, rgba(5, 7, 18, 0.9) 100%);
  pointer-events: none;
  z-index: 0;
}

.intro-card > * {
  position: relative;
  z-index: 1;
}

.intro-card--1 {
  background: var(--bg-card) url("images/intro1-bg.png") center / cover no-repeat;
}

.intro-card--2 {
  background: var(--bg-card) url("images/intro2-bg.png") center / cover no-repeat;
}

.intro-card--3 {
  background: var(--bg-card) url("images/intro3-bg.png") center / cover no-repeat;
}

.intro-card:hover {
  border-color: var(--accent-dim);
  box-shadow: 0 0 24px var(--accent-dim);
}

.intro-card-graphic {
  margin-bottom: var(--space-sm);
}

.intro-card-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-gold-glow), transparent);
  border: 1px solid rgba(201, 162, 39, 0.4);
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent-gold);
}

.intro-card-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  margin: 0 0 var(--space-xs);
  color: var(--text);
}

.intro-card-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin: 0;
  line-height: 1.5;
}

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

.intro em {
  color: var(--accent);
  font-style: italic;
}

/* Section titles */
h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 600;
  margin: 0 0 var(--space-md);
  color: var(--text);
  letter-spacing: 0.01em;
}

.section-lead {
  font-size: 1.0625rem;
  color: var(--text-muted);
  margin: 0 0 var(--space-lg);
  max-width: 55ch;
}

/* Problem */
.problem {
  padding: var(--space-xl) 0;
  background: var(--bg-elevated);
  border-top: 1px solid var(--border);
}

.problem-grid {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-lg);
  display: grid;
  gap: var(--space-md);
}

.problem-grid li {
  padding: var(--space-md);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--text-muted);
}

.problem-grid strong {
  color: var(--text);
  display: block;
  margin-bottom: 0.25rem;
}

.problem-punch {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-style: italic;
  color: var(--accent);
  margin: 0;
  max-width: 40ch;
  text-shadow: 0 0 40px var(--accent-dim);
}

/* First principles — single quote card (wider layout for differentiation) */
.first-principles {
  padding: var(--space-xl) 0;
  border-top: 1px solid var(--border);
}

.first-principles .container {
  max-width: 52rem;
}

.principle-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: var(--space-lg);
}

.principle-card-graphic {
  position: absolute;
  top: 0;
  right: 0;
  width: 120px;
  height: 100%;
  background: radial-gradient(ellipse 80% 50% at 100% 50%, var(--accent-dim) 0%, transparent 70%);
  pointer-events: none;
  border-radius: 0 var(--radius) var(--radius) 0;
}

.principle-card-quote {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-style: italic;
  color: var(--text);
  margin: 0;
  line-height: 1.5;
  position: relative;
  z-index: 1;
}

main {
  position: relative;
  z-index: 1;
}

/* Tiers — graphic cards */
.tiers {
  padding: var(--space-xl) 0;
  background: var(--bg-elevated);
  border-top: 1px solid var(--border);
}

.tier-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.tier-card {
  position: relative;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-lg);
  transition: border-color 0.2s, box-shadow 0.2s;
  overflow: hidden;
}

.tier-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(5, 7, 18, 0.75) 0%, rgba(5, 7, 18, 0.92) 100%);
  pointer-events: none;
  z-index: 0;
}

.tier-card > * {
  position: relative;
  z-index: 1;
}

.tier-card--1 {
  background: var(--bg-card) url("images/tier1-bg.jpg") center / cover no-repeat;
}

.tier-card--2 {
  background: var(--bg-card) url("images/tier2-bg.webp") center / cover no-repeat;
}

.tier-card--3 {
  background: var(--bg-card) url("images/tier3-bg.jpg") center / cover no-repeat;
}

.tier-card:hover {
  border-color: var(--accent-dim);
  box-shadow: 0 0 24px var(--accent-dim);
}

.tier-card-head {
  margin-bottom: var(--space-sm);
}

.tier-card-level {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: var(--space-xs);
}

.tier-card h3 {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  margin: 0 0 2px;
  color: var(--text);
}

.tier-card-meta {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin: 0;
}

.tier-card-one {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin: 0 0 var(--space-sm);
  line-height: 1.5;
}

.tier-card-bullets {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.tier-card-bullets li {
  padding-left: 1rem;
  position: relative;
  margin-bottom: 0.35rem;
}

.tier-card-bullets li::before {
  content: "·";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: bold;
}

@media (max-width: 900px) {
  .tier-cards { grid-template-columns: 1fr; }
}

/* How we build — DAG & Ontology */
.methodology {
  padding: var(--space-xl) 0;
  border-top: 1px solid var(--border);
  background: var(--bg-elevated);
}

.methodology-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

.methodology-card {
  position: relative;
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: var(--space-lg);
  overflow: hidden;
}

.methodology-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(5, 7, 18, 0.78) 0%, rgba(5, 7, 18, 0.92) 100%);
  pointer-events: none;
  z-index: 0;
}

.methodology-card > * {
  position: relative;
  z-index: 1;
}

.methodology-card--dag {
  background: var(--bg-card) url("images/methodology-dag-bg.png") center / cover no-repeat;
}

.methodology-card--ontology {
  background: var(--bg-card) url("images/methodology-ontology-bg.webp") center / cover no-repeat;
}

.methodology-card h3 {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  font-weight: 600;
  margin: 0 0 var(--space-sm);
  color: var(--text);
}

.methodology-card p {
  font-size: 0.9375rem;
  color: var(--text-muted);
  margin: 0;
  line-height: 1.55;
}

.methodology-card strong {
  color: var(--text);
}

.methodology-subhead {
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin: var(--space-sm) 0 var(--space-xs);
}

.methodology-bullets {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-sm);
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.55;
}

.methodology-bullets li {
  padding-left: 1rem;
  position: relative;
  margin-bottom: 0.25rem;
}

.methodology-bullets li::before {
  content: "·";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: bold;
}

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

/* Use cases */
.use-cases {
  padding: var(--space-xl) 0;
  border-top: 1px solid var(--border);
}

.use-case-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.use-case {
  position: relative;
  padding: var(--space-md);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.use-case-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(5, 7, 18, 0.72) 0%, rgba(5, 7, 18, 0.9) 100%);
  pointer-events: none;
  z-index: 0;
}

.use-case-card > * {
  position: relative;
  z-index: 1;
}

.use-case-card--bg1 {
  background: var(--bg-card) url("images/usecase1-bg.webp") center / cover no-repeat;
}

.use-case-card--bg2 {
  background: var(--bg-card) url("images/usecase2-bg.jpg") center / cover no-repeat;
}

.use-case-card--bg3 {
  background: var(--bg-card) url("images/usecase3-bg.webp") center / cover no-repeat;
}

.use-case-card--bg4 {
  background: var(--bg-card) url("images/usecase4-bg.jpg") center / cover no-repeat;
}

/* Use-case icons — consistent CSS shapes (no Unicode) */
.use-case-icon {
  display: block;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: var(--accent-dim);
  margin-bottom: var(--space-sm);
  position: relative;
}

.use-case-icon::before {
  content: "";
  position: absolute;
  inset: 50%;
  transform: translate(-50%, -50%);
  width: 14px;
  height: 14px;
  background: var(--accent);
  border-radius: 2px;
}

.use-case-icon--chart::before {
  width: 0;
  height: 0;
  background: transparent;
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-bottom: 10px solid var(--accent);
  inset: 50% 50% auto auto;
  transform: translate(50%, -50%) rotate(-45deg);
}

.use-case-icon--training::before {
  border-radius: 50%;
  width: 10px;
  height: 10px;
}

.use-case-icon--lead::before {
  border-radius: 50%;
  width: 8px;
  height: 8px;
}

.use-case-icon--risk::before {
  width: 0;
  height: 0;
  background: transparent;
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-bottom: 10px solid var(--accent);
  inset: 30% 50% auto auto;
  transform: translate(50%, -50%);
}

.use-case-icon--ramp::before {
  width: 0;
  height: 0;
  background: transparent;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-bottom: 10px solid var(--accent);
  inset: 50% 50% auto auto;
  transform: translate(50%, -50%);
}

.use-case-icon--churn::before {
  width: 12px;
  height: 6px;
  border-radius: 12px 12px 0 0;
  background: transparent;
  border: 2px solid var(--accent);
  border-bottom: none;
  inset: 60% 50% auto auto;
  transform: translate(50%, 50%);
}

.use-case-icon--territory::before {
  width: 6px;
  height: 6px;
  background: var(--accent);
  box-shadow: 10px 0 0 var(--accent), 0 10px 0 var(--accent), 10px 10px 0 var(--accent);
  inset: 50% 50% auto auto;
  transform: translate(calc(-50% - 5px), calc(-50% - 5px));
}

.use-case-icon--winloss::before {
  width: 2px;
  height: 12px;
  box-shadow: 6px -6px 0 var(--accent);
  inset: 50% 50% auto auto;
  transform: translate(-50%, -50%);
}

.use-case-icon--board::before {
  width: 12px;
  height: 14px;
  border: 2px solid var(--accent);
  background: transparent;
}

.use-case h4 {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 var(--space-xs);
  color: var(--text);
}

.use-case-card p {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin: 0;
  line-height: 1.5;
}

.use-case p {
  font-size: 0.9375rem;
  color: var(--text-muted);
  margin: 0;
  line-height: 1.55;
}

.use-case:hover,
.use-case-card:hover {
  border-color: var(--accent);
  box-shadow: 0 0 24px var(--accent-dim), 0 0 0 1px var(--accent-dim);
  transition: border-color 0.3s, box-shadow 0.3s;
}

/* Who we serve (early) — pill cards */
.audience-early {
  padding: var(--space-lg) 0;
  border-top: 1px solid var(--border);
  background: var(--bg-elevated);
}

.audience-early h2 {
  margin-bottom: var(--space-md);
}

.audience-cards {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.audience-pill {
  display: inline-block;
  padding: 0.4rem 0.75rem;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-muted);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 999px;
}

.audience-pill:hover {
  border-color: var(--accent-dim);
  color: var(--text);
}

/* Who builds this */
.who {
  padding: var(--space-xl) 0;
  border-top: 1px solid var(--border);
}

.who p {
  margin: 0 0 var(--space-md);
  color: var(--text-muted);
}

.who p:last-child {
  margin-bottom: 0;
}

.who-visuals {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  margin-top: var(--space-xl);
}

.who-visual {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 4/3;
  background: var(--bg-card);
  border: 1px solid var(--border);
}

.who-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.who-visual-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(145deg, var(--bg-card) 0%, var(--bg-elevated) 100%);
  border-color: var(--border);
}

.who-visual-placeholder::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 80% at 50% 50%, var(--accent-dim) 0%, transparent 70%);
  pointer-events: none;
}

.who-visual-label {
  position: relative;
  z-index: 1;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  text-align: center;
  padding: var(--space-md);
  line-height: 1.4;
}

@media (max-width: 640px) {
  .who-visuals {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
  }
  .who-visual { aspect-ratio: 16/9; }
}

/* Patents pending — graphic cards */
.patents {
  padding: var(--space-xl) 0;
  border-top: 1px solid var(--border);
  background: var(--bg-elevated);
}

.patents-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-sm);
}

.patent-card {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.patent-card-icon {
  color: var(--accent);
  font-size: 1rem;
  flex-shrink: 0;
}

.patent-card strong {
  color: var(--text);
}

@media (max-width: 640px) {
  .patents-cards { grid-template-columns: 1fr; }
}

/* Tiers CTA */
.tiers-cta {
  text-align: center;
  padding-top: 0;
}

.tiers-cta .btn {
  margin: 0;
}

/* CTA */
.cta {
  padding: var(--space-2xl) 0;
  background: var(--bg-elevated);
  border-top: 1px solid var(--border);
  text-align: center;
}

.cta-lead {
  font-size: 1.125rem;
  color: var(--text);
  margin: 0 0 var(--space-md);
  max-width: 52ch;
  margin-left: auto;
  margin-right: auto;
}

.cta p {
  color: var(--text-muted);
  margin: 0 0 var(--space-lg);
  max-width: 50ch;
  margin-left: auto;
  margin-right: auto;
}

.contact-block {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  justify-content: center;
  margin-bottom: var(--space-lg);
}

.cta-location {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin: 0;
}

/* Footer */
.site-footer {
  padding: var(--space-xl) 0;
  border-top: 1px solid var(--border);
  text-align: center;
}

.footer-cta {
  margin-bottom: var(--space-lg);
}

.footer-contact {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  justify-content: center;
  margin-bottom: var(--space-md);
}

.footer-contact a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9375rem;
}

.footer-contact a:hover {
  color: var(--accent);
}

.footer-copy {
  margin: 0;
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* Mobile */
@media (max-width: 768px) {
  .nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    padding: var(--space-sm);
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
  }

  .nav.is-open {
    display: flex;
  }

  .nav a {
    padding: var(--space-sm);
    border-bottom: 1px solid var(--border);
  }

  .nav a:last-child {
    border-bottom: none;
  }

  .nav-cta-first {
    order: -1;
    border-bottom: 1px solid var(--border);
    padding: var(--space-sm);
    margin-bottom: var(--space-xs);
  }

  .menu-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 6px;
  }

  .menu-toggle::before,
  .menu-toggle::after {
    content: "";
    height: 2px;
    background: var(--text);
    width: 100%;
  }

  .hero {
    padding: var(--space-xl) 0;
  }

  .browser-chrome {
    padding: 8px 10px 0;
  }

  .browser-dots { margin-bottom: 8px; }
  .browser-dot { width: 8px; height: 8px; }
  .browser-url { font-size: 0.6875rem; }
  .browser-status-label { font-size: 0.625rem; }

  .contact-block {
    flex-direction: column;
  }

  .contact-block .btn {
    width: 100%;
    text-align: center;
  }
}

@media (max-width: 480px) {
  :root {
    --space-xl: 3rem;
    --space-2xl: 4rem;
  }

  .container {
    padding: 0 var(--space-sm);
  }
}