/* ============================================
   TRAVVANA — Navbar (Top Bar + Bottom Nav)
   ============================================ */

/* ── Top Bar (Flush Full-Width Design) ── */
.top-bar {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  width: 100%;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--sp-6);
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--clr-bg-surface);
  z-index: var(--z-nav);
  transition: transform 0.3s var(--ease-out);
}

.top-bar--hidden {
  transform: translateY(-120%);
}

/* ── Logo ── */
.top-bar__logo {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--fs-xl);
  font-weight: var(--fw-extrabold);
  letter-spacing: var(--ls-tight);
  flex-shrink: 0;
}

.top-bar__logo-img {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  object-fit: cover;
}

.top-bar__logo-text {
  background: var(--clr-accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ── Right side: Nav Links + Actions grouped together ── */
.top-bar__right {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

.top-bar__nav {
  display: none; /* hidden on mobile, shown on desktop */
  align-items: center;
  gap: var(--sp-1);
}

.top-bar__nav-link {
  padding: 6px var(--sp-3);
  border-radius: var(--radius-full);
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  color: var(--clr-text-secondary);
  transition: all var(--tr-fast);
  white-space: nowrap;
  letter-spacing: 0.01em;
  cursor: pointer;
}

.top-bar__nav-link:hover {
  color: var(--clr-text-primary);
  background: var(--clr-bg-surface);
}

.top-bar__nav-link--active {
  background: var(--clr-accent);
  color: white;
  font-weight: var(--fw-bold);
}

.top-bar__nav-link--active:hover {
  background: var(--clr-accent-hover);
  color: white;
}

/* ── Theme Switch Button (Single Dynamic Icon) ── */
.theme-toggle-btn {
  position: relative;
  width: 44px;
  height: 44px;
  border-radius: 999px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--clr-border);
  background: rgba(255, 255, 255, 0.06);
  cursor: pointer;
  margin-left: var(--sp-4);
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
  transition: transform 0.4s cubic-bezier(0.65, 0, 0.35, 1), 
              box-shadow 0.4s cubic-bezier(0.65, 0, 0.35, 1),
              background 0.4s cubic-bezier(0.65, 0, 0.35, 1),
              border-color 0.4s cubic-bezier(0.65, 0, 0.35, 1);
}

[data-theme="light"] .theme-toggle-btn {
  background: rgba(0, 0, 0, 0.05);
}

.theme-toggle-btn:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.theme-icon-sun, .theme-icon-moon {
  position: absolute;
  font-size: 20px;
  transition: all 0.4s cubic-bezier(0.65, 0, 0.35, 1);
}

/* Default Dark Mode active -> Show Sun (Click to go Light) */
.theme-icon-sun {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

.theme-icon-moon {
  opacity: 0;
  transform: rotate(90deg) scale(0.5);
}

/* Light Mode active -> Show Moon (Click to go Dark) */
[data-theme="light"] .theme-icon-sun {
  opacity: 0;
  transform: rotate(-90deg) scale(0.5);
}

[data-theme="light"] .theme-icon-moon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

/* ── Actions ── */
.top-bar__actions {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  flex-shrink: 0;
}

.top-bar__btn {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--clr-bg-tertiary);
  border: 1px solid var(--clr-border);
  color: var(--clr-text-secondary);
  transition: all var(--tr-fast);
  font-size: var(--fs-md);
  cursor: pointer;
}

.top-bar__btn:hover {
  background: var(--clr-bg-card-hover);
  color: var(--clr-accent);
  border-color: var(--clr-border-active);
}

/* ── Bottom Navigation ── */
.bottom-nav {
  position: fixed;
  bottom: calc(var(--sp-4) + env(safe-area-inset-bottom, 12px));
  left: var(--sp-4);
  right: var(--sp-4);
  height: var(--bottom-nav-h);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: space-around;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-lg);
  z-index: var(--z-nav);
  padding: 0 var(--sp-2);
}

.bottom-nav__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: var(--sp-1) var(--sp-3);
  border-radius: var(--radius-md);
  color: var(--clr-text-muted);
  transition: all var(--tr-fast);
  position: relative;
  -webkit-tap-highlight-color: transparent;
}

.bottom-nav__item:active {
  transform: scale(0.92);
}

.bottom-nav__item--active {
  color: var(--clr-accent);
}

.bottom-nav__icon {
  font-size: 20px;
  line-height: 1;
  transition: transform var(--tr-spring), filter var(--tr-normal);
}

.bottom-nav__item--active .bottom-nav__icon {
  transform: scale(1.15);
  filter: drop-shadow(0 0 12px var(--clr-accent));
}

.bottom-nav__label {
  font-size: 10px;
  font-weight: var(--fw-medium);
  letter-spacing: var(--ls-wide);
}

/* ── AI Planner center button ── */
.bottom-nav__item--center {
  position: relative;
  margin-top: -16px;
}

.bottom-nav__item--center .bottom-nav__icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: var(--clr-accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 20px;
  box-shadow: var(--shadow-glow);
}

/* ── Content offset for fixed bars ── */
.page-content {
  padding-top: var(--sp-4);
  padding-bottom: calc(var(--bottom-nav-h) + var(--sp-8) + env(safe-area-inset-bottom, 12px));
  min-height: 100vh;
}

/* ── Desktop: Hide bottom nav, show top nav links ── */
@media (min-width: 768px) {
  .top-bar__nav {
    display: flex;
  }
  .top-bar {
    padding: 0 var(--sp-8);
  }
}

@media (min-width: 1024px) {
  .bottom-nav { display: none; }
  .page-content { padding-bottom: var(--sp-8); }
  .top-bar {
    padding: 0 var(--sp-10);
  }
}