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

html {
  font-family: var(--font-body);
  color: var(--color-ink);
  background-color: var(--color-paper);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

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

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: var(--space-3);
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: 1.25rem; }

p {
  margin-bottom: var(--space-4);
  font-size: 1.125rem;
}

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

.content-container {
  max-width: var(--content-width);
  margin: 0 auto;
}

/* Header & Nav */
.site-header {
  border-bottom: 1px solid var(--color-border);
  background-color: var(--color-paper);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 4rem;
}

.logo {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.25rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.site-nav {
  display: flex;
  gap: var(--space-4);
}

.nav-link {
  font-weight: 600;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: var(--space-2) 0;
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s ease;
}

.nav-link:hover, .nav-link.active {
  border-color: var(--color-accent);
}

/* Main Content */
.site-main {
  flex: 1;
  padding: var(--space-8) 0;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-border);
  background-color: var(--color-paper-alt);
  padding: var(--space-8) 0 var(--space-4);
  margin-top: auto;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--space-8);
  margin-bottom: var(--space-8);
}

.footer-brand p {
  color: var(--color-muted);
  font-size: 0.875rem;
  margin-top: var(--space-2);
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
}

.footer-col h4 {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-3);
  color: var(--color-muted);
}

.footer-col a {
  display: block;
  font-size: 0.875rem;
  margin-bottom: var(--space-2);
}

.footer-col a:hover {
  color: var(--color-accent);
  text-decoration: underline;
}

.footer-bottom {
  text-align: center;
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-4);
  font-size: 0.75rem;
  color: var(--color-muted);
}

/* Grid Systems */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
}

@media (max-width: 768px) {
  .footer-inner {
    grid-template-columns: 1fr;
  }
  .footer-links {
    grid-template-columns: 1fr 1fr;
  }
  .grid-2, .grid-3 {
    grid-template-columns: 1fr;
  }
  .site-nav {
    display: none; /* Mobile nav placeholder */
  }
}