/* ============================================================
   THE AI STUDIO — style.css
   Design: Palantir meets Swiss Design
   Dark-first, monochrome + #FF4500 accent, no decoration
   ============================================================ */

/* ============================================================
   1. GOOGLE FONTS IMPORT
   ============================================================ */
@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500&family=Inter+Tight:wght@700;800;900&family=Inter:wght@400;500;600;700;800&display=swap');

/* ============================================================
   2. CSS CUSTOM PROPERTIES
   ============================================================ */
:root {
  --bg-primary:    #0A0A0A;
  --bg-secondary:  #111111;
  --bg-tertiary:   #1A1A1A;
  --text-primary:  #FFFFFF;
  --text-secondary:#AAAAAA;
  --text-muted:    #666666;
  --accent:        #FF4500;
  --border:        #222222;
  --border-light:  #333333;

  --font-sans:    'Inter', 'Helvetica Neue', Arial, sans-serif;
  --font-display: 'Inter Tight', 'Inter', sans-serif;
  --font-mono:    'IBM Plex Mono', 'SF Mono', 'Fira Code', monospace;

  --header-height: 72px;

  --space-xs:  8px;
  --space-sm:  16px;
  --space-md:  32px;
  --space-lg:  64px;
  --space-xl:  96px;
  --space-2xl: 128px;

  --max-width: 1200px;
  --wide-width: 1400px;
}

/* ============================================================
   3. RESET & BASE
   ============================================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-secondary);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* ============================================================
   4. SKIP TO CONTENT (ACCESSIBILITY)
   ============================================================ */
.skip-link {
  position: absolute;
  top: -100%;
  left: 0;
  padding: 12px 24px;
  background: var(--accent);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  z-index: 9999;
  transition: top 0.2s;
}

.skip-link:focus {
  top: 0;
}

/* ============================================================
   5. TYPOGRAPHY — BASE
   ============================================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.025em;
  line-height: 1.1;
}

h1 { font-size: clamp(40px, 6vw, 72px); }
h2 { font-size: clamp(28px, 4vw, 48px); }
h3 { font-size: clamp(20px, 2.5vw, 28px); }
h4 { font-size: 20px; font-weight: 700; }
h5 { font-size: 16px; font-weight: 700; }

p {
  color: var(--text-secondary);
  font-size: 17px;
  line-height: 1.7;
}

/* Section label — monospace, uppercase, accent */
.label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 20px;
}

/* Focus styles */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* ============================================================
   6. LAYOUT UTILITIES
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.container--wide {
  max-width: var(--wide-width);
  margin: 0 auto;
  padding: 0 24px;
}

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

.section--dark {
  background-color: var(--bg-secondary);
}

.section--tertiary {
  background-color: var(--bg-tertiary);
}

/* Thin horizontal rule */
.rule {
  border: none;
  border-top: 1px solid var(--border);
  margin: var(--space-lg) 0;
}

/* ============================================================
   7. SCROLL ANIMATIONS
   ============================================================ */
[data-animate] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-animate].visible {
  opacity: 1;
  transform: translateY(0);
}

[data-animate][data-delay="100"] { transition-delay: 0.1s; }
[data-animate][data-delay="200"] { transition-delay: 0.2s; }
[data-animate][data-delay="300"] { transition-delay: 0.3s; }
[data-animate][data-delay="400"] { transition-delay: 0.4s; }
[data-animate][data-delay="500"] { transition-delay: 0.5s; }

/* ============================================================
   8. HEADER & NAVIGATION
   ============================================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  z-index: 1000;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background 0.3s ease, border-color 0.3s ease;
}

.header.scrolled {
  background: rgba(10, 10, 10, 0.96);
  border-bottom-color: var(--border);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--wide-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* Logo */
.logo {
  font-family: var(--font-sans);
  font-size: 18px;
  font-weight: 400;
  color: var(--text-primary);
  letter-spacing: -0.01em;
  text-decoration: none;
  white-space: nowrap;
}

.logo strong {
  font-weight: 800;
}

/* Desktop nav */
.nav {
  display: none;
}

.nav__list {
  display: flex;
  align-items: center;
  gap: 40px;
}

.nav__link {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s ease;
}

.nav__link:hover {
  color: var(--text-primary);
}

.nav__link--active {
  color: var(--text-primary);
}

/* CTA button in nav */
.btn--nav {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 9px 20px;
  text-decoration: none;
  transition: background 0.2s ease, color 0.2s ease;
  display: inline-block;
}

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

/* Mobile menu button */
.menu-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  width: 28px;
  cursor: pointer;
  padding: 4px 0;
  background: none;
  border: none;
}

.menu-toggle__bar {
  display: block;
  width: 100%;
  height: 1.5px;
  background: var(--text-primary);
  transition: transform 0.3s ease, opacity 0.3s ease;
  transform-origin: center;
}

.menu-open .menu-toggle__bar:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.menu-open .menu-toggle__bar:nth-child(2) {
  opacity: 0;
}

.menu-open .menu-toggle__bar:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* Mobile overlay */
.nav-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg-primary);
  z-index: 999;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.menu-open .nav-overlay {
  opacity: 1;
  pointer-events: all;
}

.nav-overlay__list {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 32px;
  text-align: center;
}

.nav-overlay__link {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

.nav-overlay__cta {
  margin-top: 16px;
  font-size: 18px;
  font-weight: 600;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 14px 32px;
  text-decoration: none;
  transition: background 0.2s ease, color 0.2s ease;
}

.nav-overlay__cta:hover {
  background: var(--accent);
  color: #fff;
}

/* ============================================================
   9. BUTTONS & LINKS
   ============================================================ */
.btn {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 14px 32px;
  border: 1px solid var(--accent);
  color: var(--accent);
  background: transparent;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease;
  line-height: 1;
}

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

.btn--large {
  font-size: 15px;
  padding: 18px 40px;
}

/* Arrow link */
.arrow-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
  letter-spacing: 0.02em;
  transition: gap 0.2s ease;
}

.arrow-link:hover {
  gap: 10px;
}

.arrow-link .arrow {
  transition: transform 0.2s ease;
  display: inline-block;
}

.arrow-link:hover .arrow {
  transform: translateX(4px);
}

/* ============================================================
   10. IMAGE PLACEHOLDERS
   ============================================================ */
.img-placeholder {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  overflow: hidden;
  position: relative;
}

.img-placeholder img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.4s ease;
}

.img-placeholder:hover img {
  transform: scale(1.02);
}

.img-placeholder--hero {
  aspect-ratio: 3/4;
  width: 100%;
  border: none;
  background: none;
}

.img-placeholder--medium {
  aspect-ratio: 4/5;
  width: 100%;
}

.hero-svg-anim {
  width: 100%;
  height: 100%;
  display: block;
}

/* ============================================================
   11. HERO SECTIONS
   ============================================================ */
.hero {
  min-height: 100vh;
  padding-top: var(--header-height);
  display: flex;
  align-items: center;
  background: var(--bg-primary);
  position: relative;
  overflow: hidden;
}

.hero__inner {
  width: 100%;
  max-width: var(--wide-width);
  margin: 0 auto;
  padding: var(--space-xl) 24px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 64px;
  align-items: center;
}

.hero__content {
  max-width: 700px;
}

.hero__headline {
  font-family: var(--font-display);
  font-size: clamp(40px, 6vw, 72px);
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  line-height: 1.05;
  margin-bottom: 28px;
}

.hero__sub {
  font-size: 18px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
  max-width: 580px;
}

.hero__tagline {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 40px;
}

.hero__image {
  max-width: 440px;
  margin: 0 auto;
}

/* ============================================================
   12. SECTION — PROBLEM / CENTERED TEXT
   ============================================================ */
.section-centered {
  text-align: center;
}

.section-centered .section__headline {
  max-width: 800px;
  margin: 0 auto 28px;
}

.section-centered .section__body {
  max-width: 720px;
  margin: 0 auto;
  font-size: 18px;
  line-height: 1.75;
}

/* ============================================================
   13. SECTION — THREE PILLARS
   ============================================================ */
.pillars {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--border);
}

.pillar {
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--border);
}

.pillar__number {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.1em;
  margin-bottom: 20px;
}

.pillar__title {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.pillar__body {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
}

/* ============================================================
   14. SECTION — WHY US
   ============================================================ */
.why-us {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

.why-us__left .section__label {
  margin-bottom: 20px;
}

.differentiators {
  display: flex;
  flex-direction: column;
}

.differentiator {
  padding: 24px 0;
  border-bottom: 1px solid var(--border);
}

.differentiator:first-child {
  border-top: 1px solid var(--border);
}

.differentiator__title {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.differentiator__desc {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ============================================================
   15. SECTION — TEAM
   ============================================================ */
.team-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg) var(--space-md);
  margin-top: var(--space-lg);
}

.team-member__photo {
  width: 80px;
  height: 80px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  margin-bottom: 16px;
  overflow: hidden;
  filter: grayscale(100%);
  flex-shrink: 0;
}

.team-member__photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.team-member__name {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.team-member__prev {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.team-member__role {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* ============================================================
   16. SECTION — FAQ ACCORDION
   ============================================================ */
.faq {
  border-top: 1px solid var(--border);
}

.faq__item {
  border-bottom: 1px solid var(--border);
}

.faq__question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 0;
  cursor: pointer;
  gap: 16px;
  background: none;
  border: none;
  width: 100%;
  text-align: left;
  font-family: var(--font-sans);
}

.faq__question:hover .faq__q-text {
  color: var(--text-primary);
}

.faq__q-text {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-secondary);
  transition: color 0.2s ease;
  line-height: 1.4;
}

.faq__item.active .faq__q-text {
  color: var(--text-primary);
}

.faq__icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  position: relative;
  color: var(--text-muted);
  transition: color 0.2s ease;
}

.faq__icon::before,
.faq__icon::after {
  content: '';
  position: absolute;
  background: currentColor;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.faq__icon::before {
  width: 100%;
  height: 1px;
  top: 50%;
  left: 0;
  transform: translateY(-50%);
}

.faq__icon::after {
  width: 1px;
  height: 100%;
  left: 50%;
  top: 0;
  transform: translateX(-50%);
}

.faq__item.active .faq__icon::after {
  transform: translateX(-50%) rotate(90deg);
  opacity: 0;
}

.faq__item.active .faq__icon {
  color: var(--accent);
}

.faq__answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}

.faq__answer-inner {
  padding-bottom: 28px;
}

.faq__answer-inner p {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* ============================================================
   17. SECTION — CTA BAND
   ============================================================ */
.cta-section {
  text-align: center;
  padding: var(--space-2xl) 0;
}

.cta-section__headline {
  font-family: var(--font-display);
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}

.cta-section__body {
  max-width: 600px;
  margin: 0 auto 40px;
  font-size: 17px;
  line-height: 1.7;
  color: var(--text-secondary);
}

/* ============================================================
   18. FOOTER
   ============================================================ */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: var(--space-lg) 0;
}

.footer__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}

.footer__brand .logo {
  font-size: 20px;
  display: block;
  margin-bottom: 8px;
}

.footer__tagline {
  font-size: 13px;
  color: var(--text-muted);
}

.footer__meta {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer__copy {
  font-size: 13px;
  color: var(--text-muted);
}

.footer__location {
  font-size: 13px;
  color: var(--text-muted);
}

.footer__links {
  display: flex;
  gap: 24px;
  align-items: center;
}

.footer__link {
  font-size: 13px;
  color: var(--text-muted);
  text-decoration: none;
  letter-spacing: 0.04em;
  transition: color 0.2s ease;
}

.footer__link:hover {
  color: var(--accent);
}

/* ============================================================
   19. PAGE-SPECIFIC — APPROACH PHASES
   ============================================================ */
.phases {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin-top: var(--space-lg);
  border-top: 1px solid var(--border);
}

.phase {
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--border);
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-md);
  align-items: start;
}

.phase__number {
  font-family: var(--font-mono);
  font-size: 48px;
  font-weight: 400;
  color: var(--border-light);
  line-height: 1;
  min-width: 60px;
}

.phase__title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
  letter-spacing: -0.02em;
}

.phase__body {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ============================================================
   20. PAGE-SPECIFIC — DELIVERABLES
   ============================================================ */
.deliverables {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--border);
  margin-top: var(--space-lg);
}

.deliverable {
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--border);
}

.deliverable__title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}

.deliverable__body {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ============================================================
   21. PAGE-SPECIFIC — ENGAGEMENT MODELS
   ============================================================ */
.engagement-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--border);
  margin-top: var(--space-lg);
}

.engagement-item {
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--border);
}

.engagement-item__tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}

.engagement-item__title {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}

.engagement-item__body {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.engagement-note {
  margin-top: var(--space-md);
  font-size: 14px;
  color: var(--text-muted);
  font-style: italic;
}

/* ============================================================
   22. PAGE-SPECIFIC — SHIFT LEFT / COMPARISON
   ============================================================ */
.shift-compare {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
  margin-top: var(--space-lg);
  border-top: 1px solid var(--border);
  padding-top: var(--space-md);
}

.shift-compare__col {
  padding: var(--space-md);
  border: 1px solid var(--border);
}

.shift-compare__col--old {
  opacity: 0.6;
}

.shift-compare__col--new {
  border-color: var(--accent);
}

.shift-compare__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.shift-compare__col--new .shift-compare__label {
  color: var(--accent);
}

.shift-compare__title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.shift-compare__body {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ============================================================
   ENGINEERING GRAVITY DIAGRAM
   ============================================================ */
.gravity-zones {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  margin-top: var(--space-lg);
  margin-bottom: var(--space-lg);
  border: 1px solid var(--border);
}

.gravity-zone {
  padding: 24px;
  border-right: 1px solid var(--border);
}

.gravity-zone:last-child {
  border-right: none;
}

.gravity-zone__tag {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.gravity-zone--left .gravity-zone__tag {
  color: var(--accent);
}

.gravity-zone__desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.gravity-compare {
  display: grid;
  grid-template-columns: 1fr 48px 1fr;
  gap: var(--space-md);
  align-items: start;
}

.gravity-model__caption {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.gravity-model__caption strong {
  color: var(--text-primary);
  font-weight: 600;
}

.gravity-bar {
  display: flex;
  height: 44px;
  border: 1px solid var(--border);
  overflow: hidden;
  margin-bottom: 20px;
}

.gravity-bar__seg {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
}

.gravity-bar__seg span {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  overflow: hidden;
  white-space: nowrap;
}

.gravity-bar__seg--left {
  background: #180800;
  border-right: 1px solid #2E1000;
}

.gravity-bar__seg--left span { color: #FF4500; }

.gravity-bar__seg--middle {
  background: #141414;
  border-right: 1px solid #222;
}

.gravity-bar__seg--middle span { color: #444; }

.gravity-bar__seg--right {
  background: #0E0E0E;
}

.gravity-bar__seg--right span { color: #2A2A2A; }

.gravity-model--new .gravity-bar {
  border-color: var(--accent);
}

.gravity-model--new .gravity-bar__seg--left {
  background: #240F00;
  border-right-color: #FF4500;
}

.gravity-arrow {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 34px;
  color: var(--text-muted);
}

.gravity-model__body {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.75;
}

.gravity-model__body strong {
  color: var(--text-primary);
  font-weight: 600;
}

/* ============================================================
   23. PAGE-SPECIFIC — CODING LEVELS
   ============================================================ */
.levels {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--border);
  margin-top: var(--space-lg);
}

.level {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-md);
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--border);
  align-items: start;
}

.level__tag {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 4px 10px;
  border: 1px solid var(--border-light);
  white-space: nowrap;
  align-self: start;
  margin-top: 4px;
}

.level__title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}

.level__body {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.level__tools {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 8px;
  letter-spacing: 0.04em;
}

/* ============================================================
   24. PAGE-SPECIFIC — ADOPTION DISTRIBUTION
   ============================================================ */
.adoption-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--border);
  margin-top: var(--space-lg);
}

.adoption-tier {
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--border);
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-md);
  align-items: start;
}

.adoption-tier__ratio {
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 400;
  color: var(--border-light);
  line-height: 1;
  min-width: 70px;
}

.adoption-tier__name {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.adoption-tier__mult {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--accent);
  margin-bottom: 8px;
}

.adoption-tier__body {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ============================================================
   25. PAGE-SPECIFIC — PRINCIPLES LIST
   ============================================================ */
.principles {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--border);
  margin-top: var(--space-lg);
}

.principle {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-md);
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
  align-items: baseline;
}

.principle__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  min-width: 28px;
}

.principle__title {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-primary);
}

/* ============================================================
   26. PAGE-SPECIFIC — OUTCOMES
   ============================================================ */
.outcomes {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--border);
  margin-top: var(--space-lg);
}

.outcome {
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--border);
}

.outcome__title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}

.outcome__body {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ============================================================
   27. PAGE-SPECIFIC — WHAT WE BUILD (AI FACTORY)
   ============================================================ */
.capabilities {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--border);
  margin-top: var(--space-lg);
}

.capability {
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--border);
}

.capability__title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
  letter-spacing: -0.02em;
}

.capability__body {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ============================================================
   28. PAGE-SPECIFIC — CASE STUDIES
   ============================================================ */
.case-studies {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.case-study {
  padding: var(--space-md);
  border: 1px solid var(--border);
  border-top: 2px solid var(--accent);
  position: relative;
}

.case-study__client {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.case-study__title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.case-study__body {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* ============================================================
   29. TWO-COLUMN SECTION LAYOUT
   ============================================================ */
.two-col {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
  align-items: start;
}

.two-col__left {
  /* left column content */
}

.two-col__right {
  /* right column content */
}

/* ============================================================
   30. SECTION HEADER (label + headline + optional body)
   ============================================================ */
.section__label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
}

.section__headline {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.025em;
  line-height: 1.1;
  margin-bottom: 24px;
}

.section__subhead {
  font-size: 18px;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 600px;
  margin-bottom: 24px;
}

.section__body {
  font-size: 17px;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 700px;
}

/* ============================================================
   GRAVITY DIAGRAM — MOBILE STACK (below 768px)
   ============================================================ */
@media (max-width: 767px) {
  .gravity-zones {
    grid-template-columns: 1fr;
  }

  .gravity-zone {
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  .gravity-zone:last-child {
    border-bottom: none;
  }

  .gravity-compare {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
  }

  .gravity-arrow {
    padding-top: 0;
    justify-content: flex-start;
  }
}

/* ============================================================
   31. RESPONSIVE — TABLET (768px+)
   ============================================================ */
@media (min-width: 768px) {
  .nav {
    display: flex;
    align-items: center;
  }

  .menu-toggle {
    display: none;
  }

  .nav-overlay {
    display: none;
  }

  .hero__inner {
    grid-template-columns: 1fr 1fr;
    align-items: center;
  }

  .hero__image {
    max-width: 100%;
    margin: 0;
  }

  .team-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .footer__inner {
    grid-template-columns: 1fr 1fr;
    align-items: end;
  }

  .shift-compare {
    grid-template-columns: 1fr 1fr;
  }
}

/* ============================================================
   32. RESPONSIVE — DESKTOP (1024px+)
   ============================================================ */
@media (min-width: 1024px) {
  .hero__inner {
    grid-template-columns: 3fr 2fr;
    gap: 80px;
  }

  .hero__content {
    max-width: 100%;
  }

  .pillars {
    grid-template-columns: repeat(3, 1fr);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
  }

  .pillar {
    border-bottom: none;
    border-right: 1px solid var(--border);
    padding: var(--space-lg) var(--space-md);
  }

  .pillar:last-child {
    border-right: none;
  }

  .why-us {
    grid-template-columns: 2fr 3fr;
    gap: var(--space-2xl);
  }

  .two-col {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
  }

  .phases {
    border-left: none;
  }

  .deliverables {
    grid-template-columns: repeat(3, 1fr);
    gap: 0;
  }

  .deliverable {
    border-right: 1px solid var(--border);
    border-bottom: none;
    padding: var(--space-md);
  }

  .deliverable:last-child {
    border-right: none;
  }

  .engagement-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .engagement-item {
    border-right: 1px solid var(--border);
    border-bottom: none;
    padding: var(--space-md);
  }

  .engagement-item:last-child {
    border-right: none;
  }

  .case-studies {
    grid-template-columns: repeat(3, 1fr);
  }

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

  .outcome {
    border-right: 1px solid var(--border);
    padding: var(--space-md);
  }

  .outcome:nth-child(2n) {
    border-right: none;
  }

  .outcome:nth-child(n+3) {
    border-top: 1px solid var(--border);
  }

  .footer__inner {
    grid-template-columns: 1fr 1fr 1fr;
    align-items: center;
  }

  .footer__meta {
    text-align: right;
  }

  .footer__links {
    justify-content: center;
  }
}

/* ============================================================
   33. RESPONSIVE — WIDE (1400px+)
   ============================================================ */
@media (min-width: 1400px) {
  .hero__inner {
    gap: 120px;
  }
}

/* ============================================================
   34. MISC UTILITIES
   ============================================================ */
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }

.text-center { text-align: center; }

/* Thin decorative line before section */
.section-rule {
  display: block;
  width: 40px;
  height: 1px;
  background: var(--accent);
  margin-bottom: var(--space-md);
}

/* Monospace inline tag */
.tag {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  border: 1px solid var(--border);
  padding: 3px 8px;
  display: inline-block;
}

/* ============================================================
   35. PAGE-SPECIFIC — TRY-BUY-BUILD PYRAMID
   ============================================================ */
.tbb-pyramid {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-top: var(--space-sm);
}

.tbb-level {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-left: 3px solid var(--border-light);
  gap: 16px;
}

.tbb-level--5 {
  border-left-color: var(--accent);
}

.tbb-level--4 {
  border-left-color: #cc3600;
}

.tbb-level--3 {
  border-left-color: #993200;
}

.tbb-level--2 {
  border-left-color: #552200;
}

.tbb-level--1 {
  border-left-color: var(--border-light);
}

.tbb-level__label {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}

.tbb-level__note {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 0.06em;
  text-align: right;
  white-space: nowrap;
}

/* ============================================================
   LIGHT MODE
   ============================================================ */
[data-theme="light"] {
  --bg-primary:    #F4F4F4;
  --bg-secondary:  #EBEBEB;
  --bg-tertiary:   #E0E0E0;
  --text-primary:  #0A0A0A;
  --text-secondary:#444444;
  --text-muted:    #888888;
  --accent:        #FF4500;
  --border:        #D5D5D5;
  --border-light:  #C0C0C0;
}

[data-theme="light"] .header.scrolled {
  background: rgba(244, 244, 244, 0.96);
}

/* SVG animations — light mode */
[data-theme="light"] .svg-bg        { fill: var(--bg-primary); }
[data-theme="light"] .svg-dot       { fill: var(--border); }
[data-theme="light"] .svg-line      { stroke: var(--border-light); }
[data-theme="light"] .svg-node      { fill: var(--bg-tertiary); stroke: var(--border); }
[data-theme="light"] .svg-node-fill { fill: var(--text-muted); }
[data-theme="light"] .svg-accent-bg { fill: #FFF0E8; }

/* Gravity bars — light mode */
[data-theme="light"] .gravity-bar__seg--left {
  background: #FFF0E8;
  border-right-color: #FFD0A8;
}
[data-theme="light"] .gravity-bar__seg--middle {
  background: var(--bg-secondary);
  border-right-color: var(--border);
}
[data-theme="light"] .gravity-bar__seg--middle span { color: var(--text-muted); }
[data-theme="light"] .gravity-bar__seg--right {
  background: var(--bg-tertiary);
}
[data-theme="light"] .gravity-bar__seg--right span { color: var(--border-light); }
[data-theme="light"] .gravity-model--new .gravity-bar__seg--left {
  background: #FFE4CC;
  border-right-color: var(--accent);
}

/* ============================================================
   THEME TOGGLE BUTTON
   ============================================================ */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  color: var(--text-secondary);
  transition: color 0.2s ease;
  flex-shrink: 0;
}

.theme-toggle:hover {
  color: var(--text-primary);
}

.theme-toggle svg {
  width: 16px;
  height: 16px;
}

/* dark (default): sun icon visible — click to go light */
.theme-toggle .icon-sun  { display: block; }
.theme-toggle .icon-moon { display: none; }

/* light: moon icon visible — click to go dark */
[data-theme="light"] .theme-toggle .icon-sun  { display: none; }
[data-theme="light"] .theme-toggle .icon-moon { display: block; }


/* Visually hidden (accessibility) */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}