:root {
  /* Colors */
  --color-midnight-ink: #111111;
  --color-canvas-white: #ffffff;
  --color-off-white-sage: #f3efeb;
  --color-faded-stone: #e9eaeb;
  --color-gunmetal-gray: #615e5b;
  --color-soft-concrete: #d8d3cc;
  --color-action-black: #000000;
  --color-highlight-orange: #ff9900;

  /* Typography — Font Families */
  --font-geist: 'Geist', ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-geist-mono: 'Geist Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Typography — Scale */
  --text-caption: 10px;
  --leading-caption: 1.2;
  --text-body-sm: 12px;
  --leading-body-sm: 1.2;
  --text-body: 14px;
  --leading-body: 1.2;
  --text-body-lg: 16px;
  --leading-body-lg: 1.2;
  --text-heading-sm: 20px;
  --leading-heading-sm: 1.2;
  --text-heading: 24px;
  --leading-heading: 1.2;
  --text-heading-lg: 32px;
  --leading-heading-lg: 1.2;
  --text-display-sm: 40px;
  --leading-display-sm: 1.2;
  --text-display: 60px;
  --leading-display: 1.2;

  /* Typography — Weights */
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-bold: 700;

  /* Spacing */
  --spacing-unit: 4px;
  --spacing-4: 4px;
  --spacing-8: 8px;
  --spacing-12: 12px;
  --spacing-16: 16px;
  --spacing-20: 20px;
  --spacing-24: 24px;
  --spacing-28: 28px;
  --spacing-32: 32px;
  --spacing-36: 36px;
  --spacing-40: 40px;
  --spacing-52: 52px;
  --spacing-56: 56px;
  --spacing-60: 60px;
  --spacing-64: 64px;
  --spacing-80: 80px;
  --spacing-88: 88px;

  /* Layout */
  --page-max-width: 1200px;
  --section-gap: 80px;
  --card-padding: 28px;
  --element-gap: 24px;

  /* Border Radius */
  --radius-lg: 10px;
  --radius-2xl: 20px;
  --radius-3xl: 32px;
  --radius-full: 140px;
  --radius-full-2: 160px;

  /* Named Radii */
  --radius-cards: 32px;
  --radius-small: 10px;
  --radius-medium: 20px;
  --radius-buttons: 160px;
  --radius-navigation: 140px;

  /* Surfaces */
  --surface-canvas-white: #ffffff;
  --surface-off-white-sage: #f3efeb;
  --surface-faded-stone: #e9eaeb;
}

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

body {
  background-color: var(--color-canvas-white);
  color: var(--color-midnight-ink);
  font-family: var(--font-geist);
  font-size: var(--text-body-lg);
  line-height: var(--leading-body-lg);
  min-height: 100vh;
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: none;
  font-family: var(--font-geist);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-primary {
  background-color: var(--color-action-black);
  color: var(--color-canvas-white);
  border-radius: var(--radius-buttons);
  padding: var(--spacing-24) var(--spacing-40);
  font-size: var(--text-body-lg);
  font-weight: var(--font-weight-bold);
}

.btn-primary:hover {
  opacity: 0.9;
}

.btn-ghost {
  background-color: transparent;
  color: var(--color-midnight-ink);
  border: 1px solid var(--color-soft-concrete);
  border-radius: var(--radius-buttons);
  padding: var(--spacing-24) var(--spacing-40);
  font-size: var(--text-body-lg);
}

.btn-ghost:hover {
  border-color: var(--color-midnight-ink);
}

/* Navigation */
.nav {
  padding: var(--spacing-24) 0;
  border-bottom: 1px solid var(--color-faded-stone);
}

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

.nav-logo {
  font-size: var(--text-heading);
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.05em;
  color: var(--color-midnight-ink);
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: var(--element-gap);
}

.nav-link {
  color: var(--color-midnight-ink);
  text-decoration: none;
  font-size: var(--text-body-lg);
  padding: var(--spacing-16) var(--spacing-20);
  border-radius: var(--radius-navigation);
  transition: background-color 0.2s ease;
}

.nav-link:hover {
  background-color: var(--color-off-white-sage);
}

/* Hero Section */
.hero {
  padding: var(--spacing-80) 0;
  text-align: center;
  background-image: url('../images/home_work.png');
  background-size: cover;
  background-position: center;
  color: var(--color-canvas-white);
  position: relative;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.4);
  z-index: 1;
}

.hero .container {
  position: relative;
  z-index: 2;
}

.hero h1 {
  font-size: var(--text-display);
  line-height: var(--leading-display);
  margin-bottom: var(--spacing-40);
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.0300em;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.hero p {
  font-size: var(--text-body-lg);
  max-width: 800px;
  margin: 0 auto var(--spacing-56);
}

.hero .btn-group {
  display: flex;
  gap: var(--spacing-24);
  justify-content: center;
}

/* Features Section */
.features {
  padding: var(--section-gap) 0;
}

.section-title {
  text-align: center;
  font-size: var(--text-heading-lg);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-80);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--element-gap);
}

.feature-card {
  background-color: var(--color-off-white-sage);
  border-radius: var(--radius-cards);
  padding: var(--card-padding);
  text-align: center;
  box-shadow: none;
}

.feature-card-link {
  display: block;
  color: var(--color-midnight-ink);
  text-decoration: none;
  transition: background-color 0.2s ease;
}

.feature-card-link:hover,
.feature-card-link:focus-visible {
  background-color: var(--color-faded-stone);
  color: var(--color-midnight-ink);
}

.feature-card-link:focus-visible {
  outline: 2px solid var(--color-highlight-orange);
  outline-offset: 4px;
}

.feature-card h3 {
  font-size: var(--text-heading);
  margin: var(--spacing-24) 0 var(--spacing-16);
  font-weight: var(--font-weight-bold);
}

.feature-card h3.app-subtitle {
  font-size: 0.95em;
  color: var(--color-gunmetal-gray);
  margin: 0 0 var(--spacing-16);
  font-weight: var(--font-weight-bold);
}

.feature-card p {
  color: var(--color-midnight-ink);
  font-size: var(--text-body-lg);
  line-height: var(--leading-body-lg);
}

.app-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-16);
  justify-content: center;
  margin: var(--spacing-24) 0;
}

.app-links a {
  color: var(--color-midnight-ink);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  transition: color 0.2s ease;
}

.app-links a:hover {
  color: var(--color-action-black);
}

/* Footer */
.footer {
  padding: var(--spacing-64) 0;
  background-color: var(--color-off-white-sage);
  margin-top: var(--section-gap);
}

.footer .container {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.footer .nav-logo {
  margin-bottom: var(--spacing-24);
}

.footer p {
  color: var(--color-gunmetal-gray);
  font-size: var(--text-body-sm);
}

/* Additional styles for utility classes */
.text-center { text-align: center; }

.btn-group { display: flex; gap: var(--spacing-24); justify-content: center; }

a {
  color: var(--color-midnight-ink);
  text-decoration: none;
}

a:hover {
  color: var(--color-action-black);
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .hero h1 {
    font-size: var(--text-display-sm);
  }
  
  .hero p {
    font-size: var(--text-body);
  }
  
  .section-title {
    font-size: var(--text-heading);
  }
  
  .nav-links {
    gap: var(--spacing-16);
  }
  
  .nav-link {
    padding: var(--spacing-12) var(--spacing-16);
  }
  
  .hero .btn-group, .btn-group {
    flex-direction: column;
  }
  
  .btn {
    width: 100%;
    max-width: 300px;
    margin: 0 auto;
  }
}