/* ============================================
   DESIGN TOKENS
   ============================================ */
:root {
  /* Colors */
  --bg: #FFFFFF;
  --fg: #0B1E33;
  --muted: #5B6B7C;
  --accent: #A8FF3B;
  --card: #F6F8FB;
  --border: #e6eaf0;
  --fg-hover: #143152;

  /* Spacing */
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 32px;
  --space-lg: 56px;
  --space-xl: 96px;

  /* Mobile-specific spacing overrides */
  --mobile-padding: 32px;

  /* Typography */
  --font-body: Inter, system-ui, -apple-system, 'Segoe UI', Roboto, Arial, sans-serif;
  --font-mono: ui-monospace, 'SFMono-Regular', Menlo, Consolas, 'Liberation Mono', monospace;

  /* Border radius */
  --radius-sm: 6px;
  --radius-md: 14px;
  --radius-lg: 16px;
}

/* ============================================
   RESET & BASE
   ============================================ */
* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  font-family: var(--font-body);
  color: var(--fg);
  background: var(--bg);
  scroll-behavior: smooth;
}

/* ============================================
   LAYOUT
   ============================================ */
.container {
  max-width: 1024px;
  margin: 0 auto;
  padding: var(--space-md);
}

/* ============================================
   NAVIGATION
   ============================================ */
.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px var(--space-md);
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  z-index: 100;
  border-bottom: 1px solid rgba(230, 234, 240, 0.5);
}

.nav-logo img {
  height: 40px;
  width: auto;
}

.nav-links {
  display: flex;
  gap: var(--space-md);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  color: var(--fg);
  text-decoration: none;
  font-size: 16px;
  font-weight: 500;
  transition: color 0.2s ease;
}

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

.nav-links a:focus {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
  border-radius: 4px;
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
  /* Reduced bottom padding for better visual flow */
  padding: var(--space-xl) 0 var(--space-md);
  display: flex;
  justify-content: center;
  align-items: center;
}

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

.hero .logo {
  width: 100%;
  max-width: 720px;
  margin: 0 auto var(--space-md);
  display: block;
}

.hero .logo img {
  width: 100%;
  height: auto;
  display: block;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1 {
  font-size: clamp(32px, 6vw, 48px);
  line-height: 1.15;
  margin: 0 0 12px;
  font-weight: 700;
}

h2 {
  font-size: clamp(24px, 4vw, 28px);
  margin: 24px 0 var(--space-xs);
  font-weight: 700;
}

h3 {
  font-size: 20px;
  font-weight: 600;
  margin: 0 0 var(--space-xs);
  color: var(--fg);
}

p {
  font-size: 18px;
  line-height: 1.6;
  color: var(--muted);
  margin: 0 0 var(--space-sm);
}

ul, ol {
  font-size: 18px;
  line-height: 1.6;
  color: var(--muted);
  margin: 0 0 var(--space-sm);
  padding-left: 24px;
}

ul li, ol li {
  margin-bottom: 8px;
}

.tagline {
  font-weight: 600;
  color: var(--fg);
  font-size: 22px;
  margin-bottom: 12px;
}

.kicker {
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #7a8a9a;
  font-size: 12px;
  display: block;
  margin-bottom: var(--space-xs);
}

.small {
  font-size: 14px;
  color: #7a8a9a;
}

.code {
  font-family: var(--font-mono);
  font-size: 14px;
  background: #0b1e3310;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
}

/* ============================================
   BUTTONS & LINKS
   ============================================ */
.cta {
  display: inline-block;
  margin-top: var(--space-sm);
  background: var(--fg);
  color: white;
  padding: 12px 18px;
  border-radius: var(--radius-md);
  text-decoration: none;
  font-weight: 600;
  transition: background 0.2s ease, transform 0.1s ease;
}

.cta:hover {
  background: var(--fg-hover);
  transform: translateY(-1px);
}

.cta:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.cta:active {
  transform: translateY(0);
}

/* ============================================
   SECTIONS
   ============================================ */
.section {
  padding: var(--space-lg) 0;
}

.approach-tagline {
  max-width: 680px;
  margin: 0 auto 32px;
  text-align: center;
  font-size: 20px;
  font-weight: 500;
  color: var(--fg);
  letter-spacing: -0.01em;
  line-height: 1.4;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-sm);
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 18px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(11, 30, 51, 0.08);
}

/* Enhanced card link styling */
.card-link {
  color: var(--fg);
  font-weight: 600;
  text-decoration: none;
  transition: color 0.2s ease;
}

.card-link:hover {
  color: var(--fg-hover);
}

.card-link:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
  padding: 48px var(--space-md) 72px;
  border-top: 1px solid var(--border);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.footer-logo {
  height: 32px;
  width: auto;
}

/* ============================================
   UTILITIES
   ============================================ */
hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 24px 0;
}

/* ============================================
   RESPONSIVE
   ============================================ */

/* Tablet and below (768px) */
@media (max-width: 768px) {
  /* Increase container padding for better whitespace */
  .container {
    padding: var(--space-md) var(--mobile-padding) !important;
  }

  /* Navigation improvements */
  .nav {
    padding: 16px var(--mobile-padding) !important;
  }

  .nav-links {
    gap: 20px;
    font-size: 14px;
  }

  /* Hero section spacing */
  .hero {
    padding: var(--space-lg) 0 var(--space-md);
  }

  /* Section vertical spacing */
  .section {
    padding: var(--space-md) 0;
  }

  /* Card grid - single column on tablet */
  .cards {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
  }

  /* Footer adjustments */
  .footer {
    padding: 48px var(--mobile-padding) 72px;
  }

  .footer-content {
    flex-direction: column;
    gap: var(--space-sm);
    text-align: center;
  }
}

/* Mobile phones (600px and below) - Stack nav vertically */
@media (max-width: 600px) {
  .nav {
    flex-direction: column;
    gap: 16px;
    padding: 16px var(--mobile-padding);
    align-items: center;
  }

  .nav-logo {
    width: 100%;
    text-align: center;
  }

  .nav-logo img {
    height: 32px;
  }

  .nav-links {
    width: 100%;
    gap: 12px 20px;
    font-size: 14px;
    flex-wrap: wrap;
    justify-content: center;
  }

  .nav-links li {
    flex-shrink: 0;
  }

  .nav-links a {
    padding: 4px 0;
    white-space: nowrap;
  }
}

/* Mobile phones (480px and below) */
@media (max-width: 480px) {
  /* Increase horizontal padding on small screens */
  .container {
    padding: 20px var(--mobile-padding) !important;
  }

  .nav {
    padding: 14px var(--mobile-padding) !important;
  }

  /* Ensure all sections have proper horizontal padding */
  .section {
    padding-left: 0;
    padding-right: 0;
  }

  /* Ensure footer respects mobile padding */
  .footer {
    padding-left: var(--mobile-padding) !important;
    padding-right: var(--mobile-padding) !important;
  }

  /* Tighter nav links on very small screens */
  .nav-links {
    gap: 16px;
    font-size: 13px;
  }

  /* Typography adjustments for readability */
  h1 {
    font-size: clamp(28px, 8vw, 40px);
    line-height: 1.2;
  }

  h2 {
    font-size: clamp(22px, 5vw, 26px);
    line-height: 1.25;
    margin: 20px 0 12px;
  }

  h3 {
    font-size: 18px;
    line-height: 1.3;
  }

  p {
    font-size: 16px;
    line-height: 1.65;
  }

  ul, ol {
    font-size: 16px;
    line-height: 1.65;
    padding-left: 20px;
  }

  .tagline {
    font-size: 19px;
    line-height: 1.4;
  }

  /* Hero adjustments */
  .hero {
    padding: var(--space-md) 0 var(--space-sm);
  }

  .hero .logo {
    margin-bottom: var(--space-sm);
  }

  /* Section spacing - more vertical breathing room */
  .section {
    padding: 40px 0;
  }

  /* Card padding increase for mobile */
  .card {
    padding: 20px;
  }

  /* Approach tagline adjustment */
  .approach-tagline {
    font-size: 18px;
    line-height: 1.5;
    margin-bottom: 24px;
  }

  /* CTA button adjustments */
  .cta {
    padding: 14px 20px;
    font-size: 16px;
    display: block;
    text-align: center;
    max-width: 240px;
    margin-left: auto;
    margin-right: auto;
  }

  /* Footer adjustments */
  .footer {
    padding: 40px var(--mobile-padding) 56px;
  }

  .footer-logo {
    height: 28px;
  }

  .small {
    font-size: 13px;
  }

  /* Code snippet readability */
  .code {
    font-size: 13px;
    padding: 3px 7px;
  }
}