/* CSS Reset & Global Styles */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: var(--line-height-base);
  letter-spacing: -0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;

  /* Sticky Footer */
  display: flex;
  flex-direction: column;
  min-height: 100vh; /* Fallback for older browsers */
  min-height: 100dvh; /* Accounts for dynamic mobile UI elements (e.g. Safari address bar) */
}

main {
  flex: 1;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-serif);
  line-height: var(--line-height-heading);
  font-weight: 500;
  margin-bottom: var(--space-sm);
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

h1 {
  font-size: 3.4rem;
  line-height: 1.15;
}
h2 {
  font-size: 2.2rem;
}
h3 {
  font-size: 1.35rem;
}

p {
  margin-bottom: var(--space-sm);
}

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

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

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

/* Layout Utilities */
.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

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

.text-center {
  text-align: center;
}
.mt-sm {
  margin-top: var(--space-sm);
}
.mt-md {
  margin-top: var(--space-md);
}
.mt-lg {
  margin-top: var(--space-lg);
}

/* Responsive Grid Helper */
.grid-3-col {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}

@media (min-width: 768px) {
  .grid-3-col {
    grid-template-columns: repeat(3, 1fr);
  }
}