/* ============================================
   ZIEN FIT — Navigation
   Desktop Navbar, Sidebar, Mobile Hamburger, Bottom Tabs
   ============================================ */

/* ── Desktop Navbar ── */
.navbar {
  position: fixed; top: 0; left: 0; right: 0;
  height: var(--nav-height);
  background: rgba(8,8,8,0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 clamp(16px, 4vw, 80px);
  z-index: 100;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur-fast);
}
.navbar.scrolled { border-bottom-color: var(--border-gold); }

.nav-brand {
  display: flex; align-items: center; gap: 10px;
  cursor: pointer;
}
.nav-brand .brand-mark {
  width: 28px; height: 28px;
  background: var(--grad-gold);
  border-radius: 2px;
  display: flex; align-items: center; justify-content: center;
  font: 700 16px var(--font-display);
  color: var(--bg-void);
}
.nav-brand .brand-name {
  font: 700 20px var(--font-display);
  letter-spacing: var(--ls-display);
  color: var(--text-primary);
}

.nav-links {
  display: none;
  align-items: center; gap: 32px;
}
.nav-links a {
  font: 600 13px var(--font-heading);
  letter-spacing: var(--ls-label);
  text-transform: uppercase;
  color: var(--text-secondary);
  position: relative;
  transition: color var(--dur-fast);
}
.nav-links a::after {
  content: '';
  position: absolute; bottom: -4px; left: 0;
  width: 100%; height: 2px;
  background: var(--gold-primary);
  transform: scaleX(0); transform-origin: left;
  transition: transform var(--dur-medium) var(--ease-snap);
}
.nav-links a:hover { color: var(--gold-light); }
.nav-links a:hover::after { transform: scaleX(1); }
.nav-links a.active { color: var(--gold-primary); }
.nav-links a.active::after { transform: scaleX(1); }

.nav-cta { display: none; }

@media (min-width: 1024px) {
  .nav-links { display: flex; }
  .nav-cta { display: block; }
  .hamburger { display: none !important; }
}

/* ── Hamburger Button ── */
.hamburger {
  display: flex; flex-direction: column; gap: 5px;
  cursor: pointer; z-index: 201;
  padding: 8px;
}
.hamburger span {
  width: 24px; height: 2px;
  background: var(--text-primary);
  transition: all var(--dur-fast) var(--ease-snap);
}
.hamburger.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ── Mobile Menu Overlay ── */
.mobile-menu {
  position: fixed; inset: 0;
  background: var(--bg-void);
  z-index: 200;
  display: flex; flex-direction: column;
  justify-content: center;
  padding: var(--space-xl);
  transform: translateX(100%);
  transition: transform var(--dur-medium) var(--ease-snap);
}
.mobile-menu.open { transform: translateX(0); }
.mobile-menu a {
  display: flex; align-items: baseline; justify-content: space-between;
  font: 700 clamp(32px, 8vw, 52px) var(--font-display);
  letter-spacing: var(--ls-display);
  text-transform: uppercase;
  color: var(--text-primary);
  padding: 16px 0;
  border-bottom: 1px solid var(--divider);
  opacity: 0;
  transform: translateY(20px);
  transition: color var(--dur-fast);
}
.mobile-menu a:hover { color: var(--gold-primary); }
.mobile-menu.open a {
  animation: fadeUp var(--dur-slow) var(--ease-snap) both;
}
.mobile-menu.open a:nth-child(1) { animation-delay: 60ms; }
.mobile-menu.open a:nth-child(2) { animation-delay: 120ms; }
.mobile-menu.open a:nth-child(3) { animation-delay: 180ms; }
.mobile-menu.open a:nth-child(4) { animation-delay: 240ms; }
.mobile-menu.open a:nth-child(5) { animation-delay: 300ms; }
.mobile-menu .menu-num {
  font: 400 14px var(--font-mono);
  color: var(--text-muted);
}
.mobile-menu .menu-footer {
  margin-top: auto;
  padding-top: var(--space-lg);
}

/* ── Desktop Sidebar (inside app pages) ── */
.sidebar {
  display: none;
  position: fixed; top: 0; left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background: var(--bg-surface);
  border-right: 1px solid var(--border-subtle);
  padding: var(--space-lg) var(--space-md);
  flex-direction: column;
  z-index: 90;
  overflow-y: auto;
}
@media (min-width: 1024px) {
  .sidebar { display: flex; }
}
.sidebar .sidebar-brand {
  display: flex; align-items: center; gap: 10px;
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--divider);
  margin-bottom: var(--space-lg);
}
.sidebar .sidebar-brand .brand-mark {
  width: 32px; height: 32px;
  background: var(--grad-gold);
  border-radius: 2px;
  display: flex; align-items: center; justify-content: center;
  font: 700 18px var(--font-display);
  color: var(--bg-void);
}
.sidebar .sidebar-brand .brand-name {
  font: 700 22px var(--font-display);
  letter-spacing: var(--ls-display);
  color: var(--text-primary);
}
.sidebar-nav { display: flex; flex-direction: column; gap: 4px; }
.sidebar-nav a {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 16px;
  font: 600 14px var(--font-heading);
  letter-spacing: var(--ls-label);
  text-transform: uppercase;
  color: var(--text-secondary);
  border-radius: 4px;
  transition: all var(--dur-fast);
}
.sidebar-nav a:hover { background: var(--bg-elevated); color: var(--text-primary); }
.sidebar-nav a.active { background: var(--gold-ghost); color: var(--gold-primary); border-left: 2px solid var(--gold-primary); }
.sidebar-nav .nav-icon { font-size: 18px; width: 24px; text-align: center; }

.sidebar-info {
  margin-top: auto;
  padding-top: var(--space-lg);
  border-top: 1px solid var(--divider);
}
.sidebar-info .sidebar-stat {
  font: 400 13px var(--font-body);
  color: var(--text-secondary);
  margin-bottom: 4px;
}
.sidebar-info .sidebar-footer {
  font: 400 11px var(--font-mono);
  color: var(--text-muted);
  margin-top: var(--space-base);
}

/* ── Bottom Tab Bar (mobile, inside app) ── */
.bottom-nav {
  position: fixed; bottom: 0; left: 0; right: 0;
  height: var(--bottom-nav-height);
  background: var(--bg-surface);
  border-top: 1px solid var(--border-gold);
  display: flex; align-items: center; justify-content: space-around;
  z-index: 100;
  padding-bottom: env(safe-area-inset-bottom, 0);
}
@media (min-width: 1024px) {
  .bottom-nav { display: none; }
}
.bottom-nav a {
  display: flex; flex-direction: column; align-items: center; gap: 2px;
  padding: 6px 12px;
  font: 500 10px var(--font-heading);
  letter-spacing: var(--ls-label);
  text-transform: uppercase;
  color: var(--text-muted);
  transition: color var(--dur-fast);
  text-decoration: none;
}
.bottom-nav a .tab-icon { font-size: 22px; }
.bottom-nav a.active { color: var(--gold-primary); }
.bottom-nav a.zia-tab {
  position: relative;
}
.bottom-nav a.zia-tab .tab-icon {
  width: 44px; height: 44px;
  border-radius: 50%;
  border: 2px solid var(--gold-primary);
  display: flex; align-items: center; justify-content: center;
  margin-top: -14px;
  background: var(--bg-surface);
  font-size: 20px;
}