/* ============================================================
   QASHO PHARMACEUTICALS — Navigation
   navigation.css — Site header, mobile drawer, active states
   ============================================================ */

/* ── SITE NAV ── */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  height: var(--nav-height-mobile);
  display: flex;
  align-items: center;
  transition: background var(--transition-base),
              box-shadow var(--transition-base),
              border-color var(--transition-base);
}

@media (min-width: 768px) {
  .site-nav {
    height: var(--nav-height);
  }
}

/* Scrolled state */
.site-nav.nav--scrolled {
  background: rgba(250, 250, 247, 0.94);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  box-shadow: var(--shadow-md);
  border-bottom: 1px solid var(--color-border);
}

/* Transparent state (top of page on dark hero) */
.site-nav.nav--dark:not(.nav--scrolled) {
  background: transparent;
}

.site-nav.nav--dark:not(.nav--scrolled) .nav-link {
  color: rgba(255, 255, 255, 0.8);
}

.site-nav.nav--dark:not(.nav--scrolled) .nav-link:hover {
  color: var(--color-accent-300);
}

.site-nav.nav--dark:not(.nav--scrolled) .nav-logo__tag {
  color: rgba(255, 255, 255, 0.7);
}

/* ── NAV INNER ── */
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-5);
}

@media (min-width: 640px) {
  .nav-inner { padding: 0 var(--space-8); }
}

@media (min-width: 1024px) {
  .nav-inner { padding: 0 var(--space-12); }
}

/* ── NAV LOGO ── */
.nav-logo {
  display: flex;
  align-items: baseline;
  gap: 6px;
  text-decoration: none;
  flex-shrink: 0;
}

.nav-logo__brand {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 600;
  font-size: var(--text-2xl);
  color: var(--color-accent-500);
  line-height: 1;
  letter-spacing: -0.01em;
}

.nav-logo__tag {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  letter-spacing: 0.02em;
  line-height: 1;
  transition: color var(--transition-fast);
}

.nav--scrolled .nav-logo__tag {
  color: var(--color-text-secondary);
}

/* ── NAV LINKS ── */
.nav-links {
  display: none;
  align-items: center;
  gap: var(--space-1);
}

@media (min-width: 768px) {
  .nav-links {
    display: flex;
  }
}

.nav-link {
  position: relative;
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
  border-radius: var(--radius-sm);
}

.nav-link:hover {
  color: var(--color-primary-600);
}

/* Active indicator */
.nav-link.active {
  color: var(--color-primary-700);
  font-weight: 600;
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 2px;
  background: var(--color-accent-500);
  border-radius: var(--radius-full);
}

/* ── NAV CTA ── */
.nav-cta {
  display: none;
}

@media (min-width: 768px) {
  .nav-cta {
    display: flex;
    align-items: center;
    gap: var(--space-3);
  }
}

/* ── HAMBURGER BUTTON ── */
.nav-hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: transparent;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  transition: background var(--transition-fast);
}

.nav-hamburger:hover {
  background: rgba(0, 0, 0, 0.06);
}

@media (min-width: 768px) {
  .nav-hamburger {
    display: none;
  }
}

.nav-hamburger__line {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: var(--radius-full);
  transform-origin: center;
  transition: transform var(--transition-base),
              opacity var(--transition-fast),
              background var(--transition-fast);
}

/* Hamburger on dark nav */
.nav--dark:not(.nav--scrolled) .nav-hamburger__line {
  background: #fff;
}

/* Hamburger → X open state */
.nav-hamburger.is-open .nav-hamburger__line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-hamburger.is-open .nav-hamburger__line:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.nav-hamburger.is-open .nav-hamburger__line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ── MOBILE DRAWER OVERLAY ── */
.nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 11, 36, 0.6);
  z-index: calc(var(--z-overlay) - 1);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
  backdrop-filter: blur(2px);
}

.nav-overlay.is-open {
  opacity: 1;
  pointer-events: auto;
}

/* ── MOBILE DRAWER ── */
.nav-drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(320px, 85vw);
  background: var(--color-hero-bg);
  z-index: var(--z-overlay);
  transform: translateX(100%);
  transition: transform var(--transition-slow);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.nav-drawer.is-open {
  transform: translateX(0);
}

/* Drawer header */
.nav-drawer__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--color-hero-border);
}

/* Drawer close button */
.nav-drawer__close {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background var(--transition-fast);
  color: rgba(255, 255, 255, 0.8);
}

.nav-drawer__close:hover {
  background: rgba(255, 255, 255, 0.14);
}

.nav-drawer__close svg {
  width: 18px;
  height: 18px;
}

/* Drawer links */
.nav-drawer__links {
  display: flex;
  flex-direction: column;
  padding: var(--space-6);
  gap: var(--space-1);
  flex: 1;
}

.nav-drawer__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-4);
  font-family: var(--font-body);
  font-size: var(--text-lg);
  font-weight: 500;
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.nav-drawer__link:hover,
.nav-drawer__link.active {
  background: rgba(255, 255, 255, 0.07);
  color: #fff;
}

.nav-drawer__link.active {
  color: var(--color-accent-400);
}

.nav-drawer__link svg {
  width: 16px;
  height: 16px;
  opacity: 0.4;
}

/* Drawer footer */
.nav-drawer__footer {
  padding: var(--space-6);
  border-top: 1px solid var(--color-hero-border);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.nav-drawer__phone {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.04);
  text-decoration: none;
  transition: background var(--transition-fast);
}

.nav-drawer__phone:hover {
  background: rgba(255, 255, 255, 0.08);
}

.nav-drawer__phone-icon {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(212, 168, 67, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.nav-drawer__phone-icon svg {
  width: 16px;
  height: 16px;
  color: var(--color-accent-400);
}

.nav-drawer__phone-text {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.8);
}