/* Navigation */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  /* Needed for absolute-positioned mobile nav drawer */
  isolation: isolate;
  background: var(--color-surface-2);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: background var(--transition-interactive), box-shadow var(--transition-interactive);
}

.site-header.scrolled {
  box-shadow: var(--shadow-md);
  background: color-mix(in srgb, var(--color-surface-2) 95%, transparent);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: var(--space-8);
}

/* Logo */

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  flex-shrink: 0;
}

.nav-logo svg {
  flex-shrink: 0;
}

.nav-logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.nav-logo-name {
  font-family: var(--font-display);
  font-size: clamp(1rem, 0.9rem + 0.4vw, 1.2rem);
  font-weight: 400;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.nav-logo-name strong {
  color: var(--color-primary);
}

.nav-logo-tagline {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-weight: 500;
}

/* Nav links */

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  display: block;
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background var(--transition-fast);
  white-space: nowrap;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-text);
  background: var(--color-surface-offset);
}

.nav-links a.active {
  color: var(--color-primary);
  background: var(--color-primary-highlight);
}

/* Nav CTA area */

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}

.nav-phone {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.nav-phone:hover {
  color: var(--color-primary);
  background: var(--color-primary-highlight);
}

.nav-phone svg {
  color: var(--color-primary);
}

/* Theme toggle */

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  cursor: pointer;
  transition: color var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast);
}

.theme-toggle:hover {
  color: var(--color-text);
  background: var(--color-surface-offset);
}

/* Mobile hamburger */

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
  cursor: pointer;
  background: none;
  border: none;
  color: var(--color-text);
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform var(--transition-interactive), opacity var(--transition-interactive);
}

/* Mobile nav drawer */

@media (max-width: 860px) {
  .nav-links {
    display: none;
    position: fixed;
    /* --nav-bottom is set by JS to the header's actual bottom edge */
    top: var(--nav-bottom, 72px);
    left: 0;
    right: 0;
    /* Fill remaining screen below the header */
    height: calc(100dvh - var(--nav-bottom, 72px));
    flex-direction: column;
    align-items: stretch;
    background: var(--color-surface-2);
    border-top: 1px solid var(--color-border);
    padding: var(--space-8) var(--space-6);
    gap: var(--space-2);
    overflow-y: auto;
    z-index: 99;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    padding: var(--space-4) var(--space-4);
    font-size: var(--text-base);
  }

  .nav-toggle {
    display: flex;
  }

  .nav-phone span {
    display: none;
  }

  .nav-phone {
    padding: var(--space-2);
  }
}

@media (max-width: 560px) {
  .nav-logo-tagline {
    display: none;
  }
}