/* ========================================
   1. CSS Custom Properties (Design Tokens)
   ======================================== */
:root {
  --color-bg: #FAFAFA;
  --color-white: #FFFFFF;
  --color-text: #1A1F2E;
  --color-text-secondary: #5A6178;
  --color-text-tertiary: #8B90A0;
  --color-accent: #4E5D94;
  --color-accent-hover: #3E4D7E;
  --color-accent-light: #EDEEF5;
  --color-border: #E8E9ED;
  --color-border-light: #F0F1F4;

  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --max-width: 1200px;
  --nav-height: 72px;
  --border-radius: 12px;
  --border-radius-sm: 8px;
  --transition: 0.2s ease;
}

/* ========================================
   2. Reset / Base Styles
   ======================================== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-family);
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul, ol {
  list-style: none;
}

/* Skip to content */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 1000;
  padding: 0.75rem 1.5rem;
  background: var(--color-accent);
  color: var(--color-white);
  border-radius: var(--border-radius-sm);
  font-weight: 500;
  font-size: 0.875rem;
}

.skip-link:focus {
  top: 1rem;
  color: var(--color-white);
}

/* ========================================
   3. Typography
   ======================================== */
h1, h2, h3, h4 {
  color: var(--color-text);
  line-height: 1.2;
  font-weight: 600;
}

h1 {
  font-size: 3.5rem;
  letter-spacing: -0.03em;
}

h2 {
  font-size: 2.25rem;
  letter-spacing: -0.02em;
}

h3 {
  font-size: 1.25rem;
  font-weight: 500;
}

p {
  color: var(--color-text-secondary);
}

.overline {
  display: block;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 1rem;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  max-width: 640px;
  margin-top: 1.25rem;
}

section h2 {
  margin-top: 0.75rem;
}

/* ========================================
   4. Layout Utilities
   ======================================== */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

section {
  padding: 4rem 0;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

/* ========================================
   5. Navigation
   ======================================== */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition);
}

.nav.scrolled {
  box-shadow: 0 1px 8px rgba(0, 0, 0, 0.06);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
}

.nav-logo {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: -0.01em;
}

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

.nav-links {
  display: none;
  gap: 2rem;
}

.nav-links a {
  font-size: 0.9375rem;
  font-weight: 400;
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--transition);
  position: relative;
}

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

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-accent);
  border-radius: 1px;
}

/* Hamburger */
.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile menu */
.nav-mobile {
  display: none;
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  padding: 1rem 0 1.5rem;
}

.nav-mobile.open {
  display: block;
}

.nav-mobile a {
  display: block;
  padding: 0.625rem 1.5rem;
  font-size: 1rem;
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--transition), background var(--transition);
}

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

/* ========================================
   6. Hero
   ======================================== */
.hero {
  padding: 5rem 0 4rem;
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border-light);
}

.hero-content {
  max-width: 720px;
}

.hero h1 {
  margin-bottom: 1.5rem;
  font-size: 2.5rem;
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 2.5rem;
  max-width: 580px;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* ========================================
   7. Section Styles
   ======================================== */

/* About */
.about-content {
  max-width: 720px;
  margin-top: 1.5rem;
}

.about-content p {
  margin-bottom: 1.25rem;
}

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

/* Ventures */
.ventures-grid {
  margin-top: 2.5rem;
}

.venture-logo {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
  margin-bottom: 1.25rem;
}

.venture-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 2rem;
  transition: transform var(--transition), box-shadow var(--transition);
}

.venture-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
}

.venture-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
  gap: 0.75rem;
}

.venture-card h3 {
  font-size: 1.125rem;
  font-weight: 600;
}

.venture-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.25rem 0.625rem;
  border-radius: 100px;
  white-space: nowrap;
  flex-shrink: 0;
}

.venture-tag.active {
  background: var(--color-accent-light);
  color: var(--color-accent);
}

.venture-tag.past {
  background: var(--color-border-light);
  color: var(--color-text-tertiary);
}

.venture-card p {
  font-size: 0.9375rem;
  line-height: 1.6;
}

/* Mobility */
.mobility-grid {
  margin-top: 2.5rem;
}

#mobility {
  background: var(--color-white);
  border-top: 1px solid var(--color-border-light);
  border-bottom: 1px solid var(--color-border-light);
}

.mobility-item {
  padding: 2.5rem 1.5rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 120px;
}

.mobility-logo {
  height: 36px;
  width: auto;
}

.mobility-item p {
  font-size: 0.8125rem;
  color: var(--color-text-tertiary);
  margin-top: 0.5rem;
}

/* Coverage */
.coverage-grid {
  margin-top: 2.5rem;
}

.coverage-item {
  border-left: 3px solid var(--color-accent);
  padding: 0.125rem 0 0.125rem 1.5rem;
}

.coverage-logo {
  height: 22px;
  width: auto;
  display: block;
  margin-bottom: 0.75rem;
}

.coverage-year {
  display: block;
  font-size: 0.8125rem;
  color: var(--color-text-tertiary);
  margin-bottom: 0.5rem;
}

.coverage-item h3 {
  font-size: 1rem;
  font-weight: 400;
  color: var(--color-text-secondary);
  line-height: 1.5;
  margin-bottom: 0.75rem;
}

.coverage-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-accent);
}

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

/* Capabilities */
.capabilities-grid {
  margin-top: 2.5rem;
}

.capabilities-grid {
  row-gap: 0;
}

.capability-item {
  padding: 1.5rem 0;
  border-top: 1px solid var(--color-border-light);
}

.capability-item h3 {
  font-size: 1.0625rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.capability-item h3::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 2px;
  margin-right: 0.625rem;
  vertical-align: middle;
}

.capability-item p {
  font-size: 0.9375rem;
  line-height: 1.6;
}

/* Leadership */
.leadership-content {
  max-width: 720px;
}

.leadership-content p {
  margin-bottom: 1rem;
}

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

/* Contact */
.contact {
  background: var(--color-white);
  border-top: 1px solid var(--color-border-light);
  border-bottom: 1px solid var(--color-border-light);
}

.contact-content {
  max-width: 560px;
}

.contact-content p {
  margin-bottom: 1.25rem;
}

.contact-email {
  display: inline-flex;
  align-items: center;
  font-weight: 500;
  font-size: 1.125rem;
  color: var(--color-accent);
  margin-bottom: 1.5rem;
}

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

.contact-details {
  font-size: 0.9375rem;
  color: var(--color-text-tertiary);
}

/* ========================================
   8. Cards (general)
   ======================================== */
/* Handled in section-specific card styles above */

/* ========================================
   9. Buttons
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.8125rem 1.75rem;
  font-family: var(--font-family);
  font-size: 0.9375rem;
  font-weight: 500;
  border-radius: var(--border-radius-sm);
  border: none;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), box-shadow var(--transition);
  text-decoration: none;
  line-height: 1;
}

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

.btn-primary:hover {
  background: var(--color-accent-hover);
  color: var(--color-white);
}

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

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

/* ========================================
   10. Footer
   ======================================== */
.footer {
  background: var(--color-white);
  border-top: 1px solid var(--color-border);
  padding: 3rem 0;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.footer-brand {
  max-width: 360px;
}

.footer-logo {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.75rem;
}

.footer-brand p {
  font-size: 0.875rem;
  color: var(--color-text-tertiary);
  line-height: 1.6;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
}

.footer-links a {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  text-decoration: none;
}

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

.footer-bottom {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  font-size: 0.8125rem;
  color: var(--color-text-tertiary);
}

/* ========================================
   11. Page-Specific Styles (privacy, legal)
   ======================================== */
.page-header {
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border-light);
  padding: 4rem 0 3rem;
}

.page-header h1 {
  font-size: 2.25rem;
  margin-bottom: 0.5rem;
}

.page-header p {
  font-size: 0.9375rem;
  color: var(--color-text-tertiary);
}

.page-content {
  padding: 3rem 0 4rem;
}

.page-content .content-body {
  max-width: 720px;
}

.page-content h2 {
  font-size: 1.375rem;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
}

.page-content h2:first-child {
  margin-top: 0;
}

.page-content p {
  margin-bottom: 1rem;
}

.page-content ul {
  margin-bottom: 1rem;
  padding-left: 1.25rem;
}

.page-content ul li {
  list-style: disc;
  margin-bottom: 0.5rem;
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ========================================
   12. Responsive Breakpoints
   ======================================== */
@media (min-width: 768px) {
  section {
    padding: 5rem 0;
  }

  h1 {
    font-size: 3rem;
  }

  .hero {
    padding: 6rem 0 5rem;
  }

  .hero h1 {
    font-size: 3rem;
  }

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

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

  .footer-inner {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
  }

  .footer-bottom {
    flex-direction: row;
    gap: 1.5rem;
    width: 100%;
    padding-top: 1.5rem;
    border-top: 1px solid var(--color-border-light);
  }
}

@media (min-width: 1024px) {
  section {
    padding: 6rem 0;
  }

  h1 {
    font-size: 3.5rem;
  }

  .hero h1 {
    font-size: 3.5rem;
  }

  .nav-links {
    display: flex;
  }

  .nav-toggle {
    display: none;
  }

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

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

/* ========================================
   13. Animations (fade-in on scroll)
   ======================================== */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

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

button:focus:not(:focus-visible) {
  outline: none;
}