/* ============================================
   LAYOUT
   Header, footer, nav, containers
   ============================================ */

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

/* --- Header --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  display: flex;
  align-items: center;
  background: rgba(var(--accent-primary-rgb), 0.03);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
}

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

/* --- Logo / Site Title --- */
.site-brand {
  display: flex;
  flex-direction: column;
  text-decoration: none;
}

.site-brand:hover {
  color: var(--accent-primary);
}

.site-brand h1 {
  font-size: var(--text-lg);
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-primary);
  line-height: 1;
  transition: color var(--transition-fast);
}

.site-brand:hover h1 {
  color: var(--accent-primary);
}

.site-brand .subtitle {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  color: var(--text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* --- Navigation --- */
.site-nav ul {
  display: flex;
  gap: var(--space-xs);
}

.site-nav a {
  display: block;
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 400;
  color: var(--text-secondary);
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-fast);
  letter-spacing: 0.02em;
}

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

.site-nav a.active {
  color: var(--text-on-accent);
  background: var(--accent-primary);
  font-weight: 700;
}

/* --- Mobile Nav Toggle --- */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
  color: var(--text-primary);
}

.nav-toggle svg {
  width: 24px;
  height: 24px;
  fill: currentColor;
}

/* --- Main Content --- */
main {
  min-height: calc(100vh - var(--header-height) - 200px);
  padding: var(--space-3xl) 0;
}

/* --- Page Header (for sub-pages) --- */
.page-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.page-header h2 {
  margin-bottom: var(--space-sm);
}

.page-header p {
  font-size: var(--text-lg);
  max-width: 600px;
  margin: 0 auto;
}

.page-header .icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-lg);
  color: var(--accent-primary);
}

/* --- Duotone Icon Colors (shared across hub cards and page headers) --- */
.page-header .icon .fa-primary,
.hub-card .card-icon .fa-primary {
  fill: var(--accent-primary);
}

.page-header .icon .fa-secondary,
.hub-card .card-icon .fa-secondary {
  fill: var(--accent-secondary);
  opacity: 0.4;
}

/* --- Footer --- */
.site-footer {
  padding: var(--space-2xl) 0;
  border-top: 1px solid var(--border-subtle);
  text-align: center;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--space-lg);
  margin-bottom: var(--space-md);
}

.footer-links a {
  color: var(--text-muted);
  font-size: var(--text-sm);
  transition: color var(--transition-fast);
}

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

.footer-links svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

.site-footer .copyright {
  font-size: var(--text-xs);
  color: var(--text-muted);
}

/* --- Theme Toggle --- */
.theme-toggle {
  position: fixed;
  bottom: var(--space-lg);
  right: var(--space-lg);
  z-index: 200;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 1px solid var(--border-medium);
  background: var(--bg-surface);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-primary);
  transition: all var(--transition-base);
  box-shadow: var(--shadow-md);
}

.theme-toggle:hover {
  background: var(--accent-glow-strong);
  border-color: var(--accent-primary);
  transform: scale(1.1);
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}