/* ================================================================
   HMWorkout — navbar.css
   Navigation Bar — Sticky, Transparent-to-Solid, Mobile Responsive
   ================================================================ */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-nav);
  height: var(--nav-h);
  background: transparent;
  transition: background 0.4s ease, box-shadow 0.4s ease, backdrop-filter 0.4s ease;
}

/* Scrolled state — applied by JS */
.navbar.scrolled {
  background: rgba(248, 249, 255, 0.88);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 24px rgba(7,26,62,0.08);
  border-bottom: 1px solid rgba(220,226,247,0.6);
}
html.dark .navbar.scrolled {
  background: rgba(6,13,31,0.88);
  border-bottom-color: rgba(28,46,88,0.6);
}

.nav-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--s-6);
  height: 100%;
  display: flex;
  align-items: center;
  gap: var(--s-8);
}

/* ── Logo ─────────────────────────────────────────────────── */
.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--s-3);
  text-decoration: none;
  flex-shrink: 0;
}
.nav-logo-img {
  height: 36px;
  width: auto;
}
.nav-logo-text {
  font-family: var(--font-display);
  font-size: var(--fs-xl);
  font-weight: var(--fw-black);
  color: var(--t-primary);
  letter-spacing: -0.02em;
}
.nav-logo-text span { color: var(--c-orange); }

/* On transparent navbar (top of page), logo text goes white */
.navbar:not(.scrolled) .nav-logo-text { color: #fff; }
.navbar:not(.scrolled) .nav-logo-text span { color: var(--c-gold); }

/* ── Desktop Nav Links ────────────────────────────────────── */
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--s-1);
  flex: 1;
}

.nav-link {
  padding: var(--s-2) var(--s-4);
  border-radius: var(--r-full);
  font-size: var(--fs-base);
  font-weight: var(--fw-medium);
  color: var(--t-secondary);
  transition: var(--ease-fast);
  position: relative;
  white-space: nowrap;
}
.nav-link:hover {
  color: var(--t-primary);
  background: var(--bg-raised);
}
.nav-link.active {
  color: var(--c-blue);
  background: rgba(21,87,255,0.08);
  font-weight: var(--fw-semibold);
}

/* On transparent navbar */
.navbar:not(.scrolled) .nav-link { color: rgba(255,255,255,0.75); }
.navbar:not(.scrolled) .nav-link:hover { color: #fff; background: rgba(255,255,255,0.12); }
.navbar:not(.scrolled) .nav-link.active { color: var(--c-gold); background: rgba(245,183,49,0.12); }

/* Hide mobile auth buttons by default on desktop */
.nav-auth-mobile {
  display: none;
}

/* ── Nav Dropdown ─────────────────────────────────────────── */
.nav-dropdown { position: relative; }
.nav-dropdown-toggle {
  display: flex;
  align-items: center;
  gap: var(--s-1);
}
.nav-dropdown-toggle i { font-size: 10px; transition: transform 0.25s ease; }
.nav-dropdown:hover .nav-dropdown-toggle i { transform: rotate(180deg); }

.nav-dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-xl);
  padding: var(--s-3);
  min-width: 200px;
  opacity: 0;
  pointer-events: none;
  transition: var(--ease-smooth);
  z-index: var(--z-nav);
}
.nav-dropdown:hover .nav-dropdown-menu {
  opacity: 1;
  pointer-events: all;
  transform: translateX(-50%) translateY(0);
}

.nav-dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--s-3);
  padding: var(--s-3) var(--s-4);
  border-radius: var(--r-md);
  color: var(--t-secondary);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  transition: var(--ease-fast);
}
.nav-dropdown-item i { width: 18px; color: var(--c-blue); }
.nav-dropdown-item:hover { background: var(--bg-raised); color: var(--t-primary); }

/* ── Nav Right Actions ────────────────────────────────────── */
.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--s-3);
  margin-left: auto;
}

/* Notification bell */
.nav-bell {
  width: 40px;
  height: 40px;
  border-radius: var(--r-full);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  color: var(--t-secondary);
  transition: var(--ease-fast);
  position: relative;
  font-size: 16px;
}
.nav-bell:hover { background: var(--c-blue); color: #fff; border-color: var(--c-blue); }
.nav-bell .notif-dot {
  position: absolute;
  top: 7px;
  right: 7px;
  width: 8px;
  height: 8px;
  background: var(--c-orange);
  border-radius: 50%;
  border: 2px solid var(--bg-surface);
}

.navbar:not(.scrolled) .nav-bell {
  background: rgba(255,255,255,0.12);
  border-color: rgba(255,255,255,0.2);
  color: rgba(255,255,255,0.8);
}

/* User avatar menu */
.nav-user {
  display: flex;
  align-items: center;
  gap: var(--s-3);
  padding: var(--s-1) var(--s-2);
  border-radius: var(--r-full);
  cursor: pointer;
  transition: var(--ease-fast);
  border: 1px solid var(--border);
  background: var(--bg-surface);
}
.nav-user:hover { border-color: var(--c-blue); box-shadow: var(--shadow-blue); }
.nav-user-info { display: flex; flex-direction: column; }
.nav-user-name { font-size: var(--fs-sm); font-weight: var(--fw-semibold); color: var(--t-primary); line-height: 1.2; }
.nav-user-plan { font-size: var(--fs-xs); color: var(--t-muted); }

/* Language switcher */
.lang-switcher {
  position: relative;
}
.lang-btn {
  display: flex;
  align-items: center;
  gap: var(--s-2);
  padding: var(--s-2) var(--s-3);
  border-radius: var(--r-full);
  background: var(--bg-raised);
  border: 1px solid var(--border);
  color: var(--t-secondary);
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  transition: var(--ease-fast);
  cursor: pointer;
}
.lang-btn:hover { background: var(--c-blue); color: #fff; border-color: var(--c-blue); }

.navbar:not(.scrolled) .lang-btn {
  background: rgba(255,255,255,0.12);
  border-color: rgba(255,255,255,0.2);
  color: rgba(255,255,255,0.85);
}

.lang-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-xl);
  padding: var(--s-2);
  min-width: 160px;
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition: var(--ease-smooth);
  z-index: var(--z-nav);
}
.lang-menu.open {
  opacity: 1;
  pointer-events: all;
  transform: translateY(0);
}
.lang-option {
  display: flex;
  align-items: center;
  gap: var(--s-3);
  padding: var(--s-2) var(--s-4);
  border-radius: var(--r-sm);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--t-secondary);
  width: 100%;
  text-align: left;
  transition: var(--ease-fast);
}
.lang-option:hover { background: var(--bg-raised); color: var(--t-primary); }
.lang-option.active { color: var(--c-blue); font-weight: var(--fw-semibold); }

/* ── Hamburger (Mobile) ───────────────────────────────────── */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--s-2);
  cursor: pointer;
  background: none;
  border: none;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--t-primary);
  border-radius: var(--r-full);
  transition: var(--ease-smooth);
}
.navbar:not(.scrolled) .hamburger span { background: #fff; }
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── Mobile Nav Drawer ────────────────────────────────────── */
@media (max-width: 1024px) {
  .hamburger { display: flex; }
  .nav-links {
    position: fixed;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: stretch;
    padding: var(--s-4) var(--s-6) var(--s-6);
    gap: var(--s-1);
    box-shadow: var(--shadow-xl);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.4s cubic-bezier(0.4,0,0.2,1), opacity 0.3s ease;
    z-index: calc(var(--z-nav) - 1);
  }
  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }
  .nav-link {
    padding: var(--s-3) var(--s-4);
    border-radius: var(--r-md);
    color: var(--t-secondary) !important;
    background: none !important;
    font-size: var(--fs-md);
  }
  .nav-link:hover { background: var(--bg-raised) !important; color: var(--t-primary) !important; }
  .nav-auth-mobile {
    display: flex;
    flex-direction: column;
    gap: var(--s-3);
    margin-top: var(--s-4);
    padding-top: var(--s-4);
    border-top: 1px solid var(--border);
  }
  .nav-actions .btn { display: none; }
}

@media (max-width: 640px) {
  .nav-user-info, .nav-bell { display: none; }
  .nav-logo-text { font-size: var(--fs-lg); }
}