/* =========================================
   NAVBAR
   ========================================= */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--navbar-height);
  display: flex;
  align-items: center;
  background-color: var(--navbar-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid transparent;
  box-shadow: none;
  transition:
    border-color var(--transition-base),
    background-color var(--transition-base),
    box-shadow var(--transition-base),
    backdrop-filter var(--transition-base);
}

.navbar.scrolled {
  background-color: var(--navbar-bg-scrolled);
  backdrop-filter: blur(28px) saturate(200%);
  -webkit-backdrop-filter: blur(28px) saturate(200%);
  border-bottom-color: var(--card-border);
  box-shadow:
    0 1px 0 var(--card-border),
    0 4px 32px rgba(0, 0, 0, 0.3),
    0 1px 8px rgba(0, 0, 0, 0.15);
}

.navbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

/* --- Logo --- */
.navbar__logo {
  display: flex;
  flex-direction: column;
  line-height: 1;
}

.navbar__logo-name {
  font-family: var(--font-bengali);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-text-primary);
  letter-spacing: 0.02em;
}

.navbar__logo-sub {
  font-family: var(--font-body-en);
  font-size: 0.6rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-accent-soft);
  margin-top: 2px;
}

/* --- Nav Links --- */
.navbar__nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.navbar__link {
  font-family: var(--font-body-en);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--color-text-secondary);
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background-color var(--transition-fast);
  position: relative;
}

.navbar__link:hover,
.navbar__link.active {
  color: var(--color-text-primary);
  background-color: rgba(139, 30, 45, 0.12);
}

/* --- CTA button in nav --- */
.navbar__cta {
  font-family: var(--font-body-en);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--color-on-accent);
  background-color: var(--color-accent);
  padding: 0.45rem 1.1rem;
  border-radius: var(--radius-md);
  margin-left: 0.5rem;
  transition: background-color var(--transition-fast), box-shadow var(--transition-fast);
}

.navbar__cta:hover {
  background-color: var(--color-accent-hover);
  box-shadow: 0 0 16px var(--glow-red);
}

/* --- Hamburger (mobile) --- */
.navbar__hamburger {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 24px;
  height: 18px;
  cursor: pointer;
  padding: 0;
  background: none;
  border: none;
  z-index: 1001;
}

.navbar__hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-text-primary);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base), width var(--transition-base);
  transform-origin: left center;
}

.navbar__hamburger.open span:nth-child(1) {
  transform: rotate(45deg) translateY(-1px);
}

.navbar__hamburger.open span:nth-child(2) {
  opacity: 0;
  width: 0;
}

.navbar__hamburger.open span:nth-child(3) {
  transform: rotate(-45deg) translateY(1px);
}

/* --- Mobile Menu --- */
.navbar__mobile-menu {
  display: none;
  position: fixed;
  top: var(--navbar-height);
  left: 0;
  right: 0;
  background-color: var(--navbar-mobile-bg);
  border-bottom: 1px solid var(--color-border);
  padding: 1.5rem var(--container-pad) 2rem;
  flex-direction: column;
  gap: 0.25rem;
  z-index: 999;
  backdrop-filter: blur(12px);
}

.navbar__mobile-menu.open {
  display: flex;
}

.navbar__mobile-link {
  font-family: var(--font-body-en);
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--color-border);
  transition: color var(--transition-fast);
}

.navbar__mobile-link:hover {
  color: var(--color-text-primary);
}

.navbar__mobile-cta {
  margin-top: 1rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-accent);
  color: var(--color-on-accent);
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  width: 100%;
  transition: background-color var(--transition-fast);
}

.navbar__mobile-cta:hover {
  background-color: var(--color-accent-hover);
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .navbar__nav { display: none; }
  .navbar__hamburger { display: flex; }
}

/* --- Actions group (theme toggle + hamburger) --- */
.navbar__actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* --- Theme Toggle --- */
.navbar__theme-toggle {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 1px solid var(--card-border);
  background: var(--card-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
  transition: border-color var(--transition-fast), color var(--transition-fast), background var(--transition-fast), box-shadow var(--transition-fast);
}

.navbar__theme-toggle:hover {
  border-color: var(--color-accent-soft);
  color: var(--color-accent-soft);
  background: rgba(139, 30, 45, 0.12);
  box-shadow: 0 0 12px var(--glow-red-subtle);
}

/* Icon visibility — moon shows in dark mode, sun shows in light mode */
.theme-icon--sun  { display: none; }
.theme-icon--moon { display: block; }

[data-theme="light"] .theme-icon--sun  { display: block; }
[data-theme="light"] .theme-icon--moon { display: none; }