/* ============================================
   LAYOUT — Grid, Navigation, Sections
   ============================================ */

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-primary);
  font-weight: var(--weight-regular);
  background: var(--surface-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ---- Scrollbar ---- */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: var(--surface-primary);
}
::-webkit-scrollbar-thumb {
  background: var(--welby-dark-blue);
  border-radius: var(--radius-full);
}

/* ---- Navigation ---- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: var(--z-nav);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-2xl);
  background: var(--nav-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--surface-glass-border);
  transition: background var(--transition-base);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
}

.nav-logo-text {
  font-size: var(--text-xl);
  font-weight: var(--weight-bold);
  color: var(--text-primary);
  letter-spacing: 0.5px;
}

.nav-logo-badge {
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  color: var(--welby-medium-blue);
  background: var(--surface-glass);
  border: 1px solid var(--surface-glass-border);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 1.5px;
}

.nav-links {
  display: flex;
  gap: var(--space-xs);
  list-style: none;
}

.nav-link {
  display: block;
  padding: var(--space-sm) var(--space-md);
  color: var(--text-muted);
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  cursor: pointer;
  white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
  background: var(--surface-glass);
}

.nav-link.active {
  color: var(--welby-medium-blue);
  box-shadow: inset 0 -2px 0 var(--welby-medium-blue);
}

/* ---- Nav Dropdowns ---- */
.nav-dropdown {
  position: relative;
}

.nav-caret {
  font-size: 10px;
  opacity: 0.6;
  margin-left: 2px;
  transition: transform var(--transition-fast);
  display: inline-block;
}

.nav-dropdown:hover .nav-caret {
  transform: rotate(180deg);
}

.nav-dropdown-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  min-width: 180px;
  background: var(--surface-card);
  border: 1px solid var(--surface-glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xs);
  opacity: 0;
  visibility: hidden;
  transition: all 0.2s ease;
  box-shadow: 0 8px 32px rgba(0,0,0,0.3);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 100;
}

.nav-dropdown:hover .nav-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.nav-dropdown-item {
  display: block;
  padding: 10px 14px;
  color: var(--text-secondary);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}

.nav-dropdown-item:hover {
  color: var(--text-primary);
  background: var(--surface-glass);
}

/* ---- Sections ---- */
.section {
  min-height: 100vh;
  padding: 100px var(--space-2xl) var(--space-3xl);
  position: relative;
  overflow: hidden;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.section-label {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  color: var(--welby-medium-blue);
  text-transform: uppercase;
  letter-spacing: 3px;
  margin-bottom: var(--space-md);
  padding: var(--space-xs) var(--space-md);
  background: var(--surface-glass);
  border: 1px solid var(--surface-glass-border);
  border-radius: var(--radius-full);
}

.section-title {
  font-size: var(--text-4xl);
  font-weight: var(--weight-bold);
  color: var(--text-primary);
  line-height: 1.2;
  margin-bottom: var(--space-md);
}

.section-subtitle {
  font-size: var(--text-lg);
  color: var(--text-muted);
  max-width: 700px;
  margin: 0 auto;
  font-weight: var(--weight-light);
}

/* ---- Grid Utilities ---- */
.grid {
  display: grid;
  gap: var(--space-lg);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-5 { grid-template-columns: repeat(5, 1fr); }
.grid-6 { grid-template-columns: repeat(6, 1fr); }

.flex {
  display: flex;
}
.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}
.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.flex-col {
  display: flex;
  flex-direction: column;
}
.flex-wrap {
  flex-wrap: wrap;
}
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }
.gap-xl { gap: var(--space-xl); }

/* ---- Container ---- */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.container-wide {
  max-width: 1600px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

/* ---- Background Effects ---- */
.bg-grid-overlay {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(148, 199, 214, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 199, 214, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
}

.bg-radial-glow {
  position: absolute;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(148, 199, 214, 0.08) 0%, transparent 70%);
  pointer-events: none;
}