/* Mobile-only chrome: bottom nav, drawer, sticky trade CTA */

.mobile-header {
  display: none; align-items: center; gap: var(--sp-2);
}
.mobile-menu-toggle {
  display: none; width: 34px; height: 34px; place-items: center;
  color: var(--text-secondary); border-radius: var(--radius-sm);
}
.mobile-menu-toggle:hover { background: var(--bg-hover); }
.hamburger, .hamburger::before, .hamburger::after {
  content: ""; display: block; width: 18px; height: 2px; background: currentColor; border-radius: 2px;
}
.hamburger { position: relative; }
.hamburger::before { position: absolute; top: -6px; }
.hamburger::after { position: absolute; top: 6px; }

/* Slide-in drawer */
.mobile-drawer {
  position: fixed; inset: 0 30% 0 0; z-index: 120;
  background: var(--bg-secondary); border-right: 1px solid var(--border-color);
  transform: translateX(-105%); transition: transform .22s ease;
  display: flex; flex-direction: column; padding: var(--sp-4);
  overflow-y: auto;
}
.mobile-drawer.open { transform: none; }
.mobile-drawer-backdrop {
  position: fixed; inset: 0; background: var(--bg-overlay); z-index: 115;
  opacity: 0; visibility: hidden; transition: var(--transition);
}
.mobile-drawer-backdrop.open { opacity: 1; visibility: visible; }
.mobile-drawer a {
  padding: 12px 10px; border-radius: var(--radius-sm); color: var(--text-secondary);
  font-weight: 500; font-size: var(--fs-lg);
}
.mobile-drawer a:hover, .mobile-drawer a.active { background: var(--bg-hover); color: var(--text-primary); }
.mobile-drawer .drawer-section { margin-top: var(--sp-4); font-size: var(--fs-xs); text-transform: uppercase; letter-spacing: .08em; color: var(--text-faint); padding: 0 10px; }
.mobile-drawer .drawer-lang { display: flex; align-items: center; gap: 10px; min-height: 44px; padding: 0 10px; }
.mobile-drawer .drawer-lang .drawer-lang-name { flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.mobile-drawer .drawer-lang .fa-check { margin-left: auto; color: var(--accent); }
.mobile-drawer .drawer-lang.is-current { color: var(--accent); }

/* ============================================================
   Bottom navigation — Tier-1 crypto app bar
   ============================================================ */
.mobile-nav {
  display: none;                         /* shown < 768px via responsive.css */
  position: fixed;
  left: 0; right: 0; bottom: 0;
  z-index: 110;
  align-items: stretch;
  gap: 2px;
  /* icon+label height + breathing room + iOS home-indicator inset */
  padding: 6px 6px calc(6px + env(safe-area-inset-bottom, 0px));
  background: var(--bg-secondary);       /* fallback: solid */
  border-top: 1px solid var(--border-color);
  box-shadow: 0 -10px 28px rgba(0, 0, 0, .38);
}
/* Frosted-glass bar where supported */
@supports ((backdrop-filter: blur(2px)) or (-webkit-backdrop-filter: blur(2px))) {
  .mobile-nav {
    background: rgba(18, 22, 28, .82);   /* --bg-secondary @ 82% */
    -webkit-backdrop-filter: saturate(180%) blur(16px);
    backdrop-filter: saturate(180%) blur(16px);
  }
}

.mnav-item {
  position: relative;
  flex: 1 1 0;
  min-width: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 6px 2px;
  border-radius: 12px;
  color: var(--text-muted);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: .01em;
  text-decoration: none;
  -webkit-tap-highlight-color: transparent;
  transition: color .15s ease, background-color .15s ease, transform .12s ease;
}
.mnav-item .mnav-icon {
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  font-size: 17px;
  line-height: 1;
}
.mnav-label {
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  opacity: .85;
}

/* Press feedback (works on touch via the global touchstart shim in mobile-nav.js) */
.mnav-item:active {
  transform: scale(.95);
  background: var(--bg-hover);
}

/* Active page */
.mnav-item.active {
  color: var(--accent);
  font-weight: 700;
}
.mnav-item.active .mnav-label { opacity: 1; }
.mnav-item.active::before {           /* slim accent bar on the top edge */
  content: "";
  position: absolute;
  top: -6px;
  left: 50%;
  transform: translateX(-50%);
  width: 22px;
  height: 3px;
  border-radius: 0 0 3px 3px;
  background: var(--accent);
}

/* Emphasised centre "Trade" tab */
.mnav-center { color: var(--text-secondary); }
.mnav-center .mnav-icon {
  width: 40px;
  height: 40px;
  margin-top: -18px;                  /* lifts above the bar, Bybit-style */
  border-radius: 14px;
  color: #fff;
  font-size: 18px;
  background: linear-gradient(145deg, var(--accent), var(--accent-hover));
  box-shadow: 0 6px 16px rgba(47, 111, 237, .45), inset 0 1px 0 rgba(255, 255, 255, .25);
}
.mnav-center.active { color: var(--accent); }
.mnav-center.active::before { display: none; }
.mnav-center.active .mnav-icon {
  box-shadow: 0 0 0 3px var(--accent-soft), 0 6px 16px rgba(47, 111, 237, .5);
}
@media (prefers-reduced-motion: reduce) {
  .mnav-item { transition: color .15s ease, background-color .15s ease; }
  .mnav-item:active { transform: none; }
}

/* Sticky buy/sell for mobile trade page */
.mobile-trade-cta {
  display: none; position: fixed; left: 0; right: 0;
  bottom: calc(var(--mobilenav-h) + env(safe-area-inset-bottom, 0px)); z-index: 105;
  gap: 8px; padding: 8px; background: var(--bg-secondary); border-top: 1px solid var(--border-color);
}
.mobile-trade-cta button { flex: 1; padding: 12px; border-radius: var(--radius-sm); font-weight: 700; }

@media (max-width: 768px) {
  .mobile-trade-cta.show { display: flex; }
  .collapsible .collapsible-body { display: none; }
  .collapsible.open .collapsible-body { display: block; }
  .collapsible-toggle { display: flex !important; }
}
.collapsible-toggle { display: none; width: 100%; justify-content: space-between; align-items: center; padding: 10px var(--sp-3); font-weight: 600; border-bottom: 1px solid var(--border-color); }
.collapsible-toggle .chev { transition: transform .2s ease; }
.collapsible.open .collapsible-toggle .chev { transform: rotate(180deg); }