/* =========================================================
   TOPBAR SYSTEM - HARDWARE ACCELERATED & GLASSMORPHIC
========================================================= */

.top-bar {
  position: sticky;
  top: 0;
  z-index: 2000;
  width: 100%;
  height: 60px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 1rem;
  
  /* Glassmorphism using your root variables */
  background: var(--card);
  backdrop-filter: blur(var(--card-blur));
  -webkit-backdrop-filter: blur(var(--card-blur));
  border-bottom: 1px solid var(--border);
  transform: translateZ(0); /* Force GPU rendering layer */
}

/* --- BUTTONS --- */
.icon-btn, .theme-btn {
  background: transparent;
  border: none;
  color: var(--text);
  width: 44px; /* Generous touch target for mobile */
  height: 44px;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  position: relative;
  transition: background-color var(--motion-fast) ease, transform var(--motion-fast) ease;
}

.icon-btn:hover, .theme-btn:hover {
  background-color: var(--surface-2);
}

.icon-btn:active, .theme-btn:active {
  transform: scale(0.92);
}

.icon {
  width: 22px;
  height: 22px;
  transition: transform var(--motion-base) cubic-bezier(0.4, 0, 0.2, 1), 
              opacity var(--motion-base) ease;
  position: absolute;
}

.hidden {
  display: none !important;
}

/* --- THEME TOGGLE ANIMATIONS (.light on body) --- */
/* Default (Dark Mode) - Show Sun to switch to Light */
body:not(.light) .theme-btn .sun { opacity: 1; transform: rotate(0) scale(1); }
body:not(.light) .theme-btn .moon { opacity: 0; transform: rotate(-90deg) scale(0); }

/* Light Mode - Show Moon to switch to Dark */
body.light .theme-btn .sun { opacity: 0; transform: rotate(90deg) scale(0); }
body.light .theme-btn .moon { opacity: 1; transform: rotate(0) scale(1); fill: currentColor; }

/* --- CENTER CLOCK & INDICATOR --- */
.top-center {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  padding: 0.25rem 1rem;
  border-radius: 8px;
  transition: background var(--motion-fast) ease;
}

.top-center:hover {
  background: var(--surface-2);
}

.live-time {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: var(--text);
}

.theme-indicator {
  position: absolute;
  top: 45px;
  font-size: 0.7rem;
  font-weight: 800;
  color: var(--accent);
  text-transform: uppercase;
  opacity: 0;
  transform: translateY(-8px);
  pointer-events: none;
  transition: all var(--motion-base) cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.theme-indicator.show {
  opacity: 1;
  transform: translateY(0);
}

/* --- DROP PANEL --- */
.top-panel {
  position: fixed;
  top: 70px;
  left: 50%;
  width: 90%;
  max-width: 320px;
  z-index: 1999;
  
  /* GPU optimizations to prevent lag */
  will-change: transform, opacity;
  pointer-events: none;
  opacity: 0;
  transform: translateX(-50%) translateY(-15px) scale(0.95);
  transition: transform var(--motion-base) cubic-bezier(0.175, 0.885, 0.32, 1.275), 
              opacity var(--motion-fast) ease;
}

.top-panel.active {
  pointer-events: auto;
  opacity: 1;
  transform: translateX(-50%) translateY(0) scale(1);
}

.panel-card {
  background: var(--card);
  backdrop-filter: blur(var(--card-blur));
  -webkit-backdrop-filter: blur(var(--card-blur));
  border: 1px solid var(--border);
  border-radius: var(--card-radius);
  padding: 1.25rem;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.panel-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px dashed var(--border);
  padding-bottom: 0.75rem;
  font-size: 0.95rem;
  color: var(--text);
}

.panel-row:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.panel-row .label {
  color: var(--text-soft);
  font-weight: 600;
}