/* =========================================================================
   TravelBangladesh — Mobile-first UI system
   Design tokens + universal navbar/drawer + glassmorphism + motion.
   Loaded on top of the Tailwind CDN build already used across the app.
   ========================================================================= */

:root {
  /* Brand gradient (matches existing .brand-gradient teal ramp) */
  --tb-teal-50:  #f0fdfa;
  --tb-teal-100: #ccfbf1;
  --tb-teal-500: #14b8a6;
  --tb-teal-600: #0d9488;
  --tb-teal-700: #0f766e;
  --tb-teal-900: #134e4a;

  /* Secondary accent used sparingly for CTAs / highlights */
  --tb-amber-400: #fbbf24;
  --tb-amber-500: #f59e0b;
  --tb-coral-500: #fb7185;

  --tb-gradient-brand: linear-gradient(135deg, var(--tb-teal-500) 0%, var(--tb-teal-700) 55%, var(--tb-teal-900) 100%);
  --tb-gradient-accent: linear-gradient(135deg, var(--tb-amber-400) 0%, var(--tb-coral-500) 100%);
  --tb-gradient-mesh: radial-gradient(60% 60% at 15% 10%, rgba(20, 184, 166, 0.35) 0%, rgba(20, 184, 166, 0) 60%),
                      radial-gradient(50% 50% at 90% 20%, rgba(251, 191, 36, 0.20) 0%, rgba(251, 191, 36, 0) 60%);

  /* Glass surfaces */
  --tb-glass-bg: rgba(255, 255, 255, 0.72);
  --tb-glass-bg-strong: rgba(255, 255, 255, 0.88);
  --tb-glass-border: rgba(255, 255, 255, 0.45);
  --tb-glass-dark-bg: rgba(15, 23, 42, 0.72);
  --tb-glass-dark-border: rgba(255, 255, 255, 0.08);

  /* Elevation */
  --tb-shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
  --tb-shadow-md: 0 8px 24px -8px rgba(15, 23, 42, 0.18);
  --tb-shadow-lg: 0 24px 48px -12px rgba(15, 23, 42, 0.28);
  --tb-shadow-glow: 0 0 0 1px rgba(20, 184, 166, 0.15), 0 12px 32px -8px rgba(13, 148, 136, 0.35);

  /* Motion */
  --tb-ease: cubic-bezier(0.22, 1, 0.36, 1);
  --tb-ease-out-fast: cubic-bezier(0.4, 0, 0.2, 1);
  --tb-dur-fast: 150ms;
  --tb-dur-base: 240ms;
  --tb-dur-slow: 380ms;

  /* Layout */
  --tb-radius-sm: 10px;
  --tb-radius-md: 16px;
  --tb-radius-lg: 24px;
  --tb-navbar-h: 64px;
  --tb-sidebar-w: 264px;
  --tb-z-navbar: 40;
  --tb-z-overlay: 49;
  --tb-z-drawer: 50;
  --tb-touch: 44px; /* minimum touch target */
}

@media (prefers-reduced-motion: reduce) {
  :root {
    --tb-dur-fast: 0ms;
    --tb-dur-base: 0ms;
    --tb-dur-slow: 0ms;
  }
  * {
    scroll-behavior: auto !important;
  }
}

html {
  scroll-behavior: smooth;
}

/* -------------------------------------------------------------------------
   Accessibility helpers
   ------------------------------------------------------------------------- */

.tb-skip-link {
  position: absolute;
  left: 1rem;
  top: -80px;
  background: var(--tb-teal-900);
  color: #fff;
  padding: 0.65rem 1.1rem;
  border-radius: var(--tb-radius-sm);
  font-weight: 600;
  font-size: 0.875rem;
  z-index: 100;
  transition: top var(--tb-dur-base) var(--tb-ease);
}
.tb-skip-link:focus {
  top: 0.75rem;
}

:focus-visible {
  outline: 2px solid var(--tb-teal-500);
  outline-offset: 2px;
  border-radius: 4px;
}

/* -------------------------------------------------------------------------
   Glassmorphism utilities
   ------------------------------------------------------------------------- */

.tb-glass {
  background: var(--tb-glass-bg);
  border: 1px solid var(--tb-glass-border);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  backdrop-filter: blur(16px) saturate(160%);
}
.tb-glass-strong {
  background: var(--tb-glass-bg-strong);
  border: 1px solid var(--tb-glass-border);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  backdrop-filter: blur(20px) saturate(180%);
}
.tb-glass-dark {
  background: var(--tb-glass-dark-bg);
  border: 1px solid var(--tb-glass-dark-border);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  backdrop-filter: blur(18px) saturate(160%);
}
/* Fallback for browsers without backdrop-filter support (older Firefox/Edge legacy) */
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .tb-glass       { background: rgba(255, 255, 255, 0.94); }
  .tb-glass-strong{ background: rgba(255, 255, 255, 0.97); }
  .tb-glass-dark  { background: rgba(15, 23, 42, 0.94); }
}

.tb-btn-gradient {
  background: var(--tb-gradient-brand);
  background-size: 160% 160%;
  color: #fff;
  transition: transform var(--tb-dur-fast) var(--tb-ease-out-fast),
              box-shadow var(--tb-dur-fast) var(--tb-ease-out-fast),
              background-position var(--tb-dur-slow) var(--tb-ease);
  box-shadow: var(--tb-shadow-sm);
}
.tb-btn-gradient:hover {
  transform: translateY(-1px);
  box-shadow: var(--tb-shadow-glow);
  background-position: 100% 0%;
}
.tb-btn-gradient:active {
  transform: translateY(0);
}

/* -------------------------------------------------------------------------
   Universal navbar
   ------------------------------------------------------------------------- */

.tb-navbar {
  position: sticky;
  top: 0;
  z-index: var(--tb-z-navbar);
  min-height: var(--tb-navbar-h);
  background: var(--tb-glass-bg);
  border-bottom: 1px solid rgba(15, 23, 42, 0.06);
  -webkit-backdrop-filter: blur(14px) saturate(160%);
  backdrop-filter: blur(14px) saturate(160%);
  transition: box-shadow var(--tb-dur-base) var(--tb-ease), background var(--tb-dur-base) var(--tb-ease);
}
.tb-navbar.is-scrolled {
  box-shadow: var(--tb-shadow-md);
  background: var(--tb-glass-bg-strong);
}
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .tb-navbar { background: rgba(255, 255, 255, 0.96); }
}

.tb-navbar__inner {
  max-width: 80rem;
  margin: 0 auto;
  height: var(--tb-navbar-h);
  padding: 0 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.tb-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 800;
  font-size: 1.05rem;
  color: var(--tb-teal-900);
  white-space: nowrap;
}
.tb-brand__mark {
  width: 2rem;
  height: 2rem;
  border-radius: var(--tb-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 0.9rem;
  background: var(--tb-gradient-brand);
  box-shadow: var(--tb-shadow-sm);
  flex-shrink: 0;
}

.tb-nav-desktop {
  display: none;
  align-items: center;
  gap: 1.75rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: #475569;
}
.tb-nav-desktop a {
  position: relative;
  padding: 0.35rem 0;
  transition: color var(--tb-dur-fast) var(--tb-ease-out-fast);
}
.tb-nav-desktop a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: -2px;
  height: 2px;
  border-radius: 2px;
  background: var(--tb-gradient-brand);
  transition: right var(--tb-dur-base) var(--tb-ease);
}
.tb-nav-desktop a:hover {
  color: var(--tb-teal-700);
}
.tb-nav-desktop a:hover::after,
.tb-nav-desktop a.is-active::after {
  right: 0;
}
.tb-nav-desktop a.is-active {
  color: var(--tb-teal-800, var(--tb-teal-700));
}

.tb-navbar__actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.tb-user-chip {
  display: none;
  align-items: center;
  gap: 0.35rem;
  font-weight: 600;
  font-size: 0.875rem;
  color: #334155;
}

/* Hamburger — three bars morphing into an X */
.tb-hamburger {
  position: relative;
  width: var(--tb-touch);
  height: var(--tb-touch);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--tb-radius-sm);
  background: transparent;
  border: 1px solid rgba(15, 23, 42, 0.08);
  cursor: pointer;
  flex-shrink: 0;
  transition: background var(--tb-dur-fast) var(--tb-ease-out-fast);
}
.tb-hamburger:hover {
  background: rgba(15, 23, 42, 0.05);
}
.tb-hamburger__box {
  width: 20px;
  height: 14px;
  position: relative;
}
.tb-hamburger__box span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  border-radius: 2px;
  background: var(--tb-teal-900);
  transition: transform var(--tb-dur-base) var(--tb-ease), opacity var(--tb-dur-fast) var(--tb-ease-out-fast), top var(--tb-dur-base) var(--tb-ease);
}
.tb-hamburger__box span:nth-child(1) { top: 0; }
.tb-hamburger__box span:nth-child(2) { top: 6px; }
.tb-hamburger__box span:nth-child(3) { top: 12px; }
.tb-hamburger[aria-expanded="true"] .tb-hamburger__box span:nth-child(1) {
  top: 6px;
  transform: rotate(45deg);
}
.tb-hamburger[aria-expanded="true"] .tb-hamburger__box span:nth-child(2) {
  opacity: 0;
}
.tb-hamburger[aria-expanded="true"] .tb-hamburger__box span:nth-child(3) {
  top: 6px;
  transform: rotate(-45deg);
}

/* -------------------------------------------------------------------------
   Slide-in drawer + overlay
   ------------------------------------------------------------------------- */

.tb-drawer-overlay {
  position: fixed;
  inset: 0;
  z-index: var(--tb-z-overlay);
  background: rgba(15, 23, 42, 0.45);
  -webkit-backdrop-filter: blur(2px);
  backdrop-filter: blur(2px);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--tb-dur-base) var(--tb-ease);
}
.tb-drawer-overlay.is-open {
  opacity: 1;
  pointer-events: auto;
}

.tb-drawer {
  position: fixed;
  top: 0;
  bottom: 0;
  width: min(86vw, 340px);
  z-index: var(--tb-z-drawer);
  display: flex;
  flex-direction: column;
  background: var(--tb-glass-bg-strong);
  -webkit-backdrop-filter: blur(22px) saturate(180%);
  backdrop-filter: blur(22px) saturate(180%);
  box-shadow: var(--tb-shadow-lg);
  transition: transform var(--tb-dur-slow) var(--tb-ease);
  overscroll-behavior: contain;
}
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .tb-drawer { background: rgba(255, 255, 255, 0.98); }
}
.tb-drawer--right {
  right: 0;
  border-left: 1px solid rgba(15, 23, 42, 0.08);
  transform: translateX(100%);
}
.tb-drawer--left {
  left: 0;
  border-right: 1px solid rgba(15, 23, 42, 0.08);
  transform: translateX(-100%);
}
.tb-drawer.is-open {
  transform: translateX(0);
}

.tb-drawer__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--tb-navbar-h);
  padding: 0 1rem 0 1.25rem;
  border-bottom: 1px solid rgba(15, 23, 42, 0.08);
  flex-shrink: 0;
}
.tb-drawer__close {
  width: var(--tb-touch);
  height: var(--tb-touch);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--tb-radius-sm);
  color: #475569;
  font-size: 1.35rem;
  line-height: 1;
  background: transparent;
  transition: background var(--tb-dur-fast) var(--tb-ease-out-fast);
}
.tb-drawer__close:hover {
  background: rgba(15, 23, 42, 0.06);
}

.tb-drawer__body {
  flex: 1;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: 1rem 0.85rem 1.5rem;
}

.tb-drawer__user {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 0.6rem;
  margin-bottom: 0.75rem;
  border-radius: var(--tb-radius-md);
  background: rgba(20, 184, 166, 0.08);
}
.tb-drawer__avatar {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 999px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  background: var(--tb-gradient-brand);
}

.tb-drawer__label {
  padding: 0.5rem 0.75rem 0.35rem;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #94a3b8;
}

.tb-drawer__link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-height: var(--tb-touch);
  padding: 0.6rem 0.75rem;
  border-radius: var(--tb-radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  color: #334155;
  transition: background var(--tb-dur-fast) var(--tb-ease-out-fast),
              color var(--tb-dur-fast) var(--tb-ease-out-fast),
              transform var(--tb-dur-fast) var(--tb-ease-out-fast);
}
.tb-drawer__link svg {
  width: 1.15rem;
  height: 1.15rem;
  flex-shrink: 0;
  color: var(--tb-teal-600);
}
.tb-drawer__link:hover {
  background: rgba(20, 184, 166, 0.10);
  transform: translateX(2px);
}
.tb-drawer__link.is-active {
  background: rgba(20, 184, 166, 0.14);
  color: var(--tb-teal-800, var(--tb-teal-700));
}
.tb-drawer__link.is-cta {
  color: #fff;
  background: var(--tb-gradient-brand);
  justify-content: center;
}
.tb-drawer__link.is-cta svg { color: #fff; }
.tb-drawer__link.is-cta:hover {
  transform: translateY(-1px);
  box-shadow: var(--tb-shadow-glow);
}
.tb-drawer__link.is-danger {
  color: #b91c1c;
  width: 100%;
  text-align: left;
  border: none;
  background: transparent;
}
.tb-drawer__link.is-danger svg { color: #dc2626; }
.tb-drawer__link.is-danger:hover {
  background: rgba(220, 38, 38, 0.08);
}

.tb-drawer__divider {
  height: 1px;
  margin: 0.65rem 0.4rem;
  background: rgba(15, 23, 42, 0.08);
}

/* body scroll-lock while a drawer is open */
body.tb-no-scroll {
  overflow: hidden;
}

/* -------------------------------------------------------------------------
   Dashboard shell (sidebar on desktop, drawer takes over on mobile)
   ------------------------------------------------------------------------- */

.tb-app-shell {
  display: flex;
  min-height: 100vh;
}

.tb-sidebar {
  display: none;
  width: var(--tb-sidebar-w);
  flex-shrink: 0;
  flex-direction: column;
  background: linear-gradient(180deg, #0f172a 0%, #111827 100%);
  color: #cbd5e1;
}
.tb-sidebar__nav {
  flex: 1;
  padding: 1rem 0.75rem;
  overflow-y: auto;
}
.tb-sidebar__link {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.6rem 0.75rem;
  border-radius: var(--tb-radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  color: #cbd5e1;
  transition: background var(--tb-dur-fast) var(--tb-ease-out-fast), color var(--tb-dur-fast) var(--tb-ease-out-fast);
  margin-bottom: 0.15rem;
}
.tb-sidebar__link svg { width: 1.1rem; height: 1.1rem; flex-shrink: 0; opacity: 0.85; }
.tb-sidebar__link:hover {
  background: rgba(255, 255, 255, 0.06);
  color: #fff;
}
.tb-sidebar__link.is-active {
  background: rgba(20, 184, 166, 0.22);
  color: #fff;
}

.tb-content {
  flex: 1;
  min-width: 0;
}

.tb-page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid rgba(15, 23, 42, 0.08);
  background: #fff;
}

@media (min-width: 768px) {
  .tb-nav-desktop { display: flex; }
  .tb-user-chip { display: flex; }
  .tb-hamburger { display: none; }
  .tb-sidebar { display: flex; }
}

/* -------------------------------------------------------------------------
   Motion utilities (respect prefers-reduced-motion via the vars above)
   ------------------------------------------------------------------------- */

@keyframes tb-fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes tb-slide-up {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes tb-float {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-8px); }
}

.tb-fade-in  { animation: tb-fade-in var(--tb-dur-slow) var(--tb-ease) both; }
.tb-slide-up { animation: tb-slide-up var(--tb-dur-slow) var(--tb-ease) both; }
.tb-float    { animation: tb-float 6s ease-in-out infinite; }

/* Card lift used for tour cards / dashboard widgets — touch-friendly (no hover-only affordance) */
.tb-card-lift {
  transition: transform var(--tb-dur-base) var(--tb-ease), box-shadow var(--tb-dur-base) var(--tb-ease);
}
.tb-card-lift:hover,
.tb-card-lift:focus-within {
  transform: translateY(-3px);
  box-shadow: var(--tb-shadow-md);
}

/* Ensure every interactive element meets the 44px touch target on small screens */
@media (max-width: 767px) {
  .tb-touch-target,
  button,
  a.tb-btn,
  input[type="submit"],
  input[type="button"] {
    min-height: var(--tb-touch);
  }
}