.top-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 48px;
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  display: block;
  z-index: 100;
  transition: transform 0.3s ease;
}

.nav-left {
  flex-direction: row;
  flex-wrap: nowrap;
  display: flex;
  align-items: center;
  gap: 0;
}

.logo {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--accent);
  margin-right: var(--spacing-xl);
  flex-shrink: 0;
}

.nav-groups {
  flex-direction: row;
  flex-wrap: nowrap;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.nav-group {
  position: relative;
  display: flex;
  align-items: center;
}

.nav-label {
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 6px var(--spacing-md);
  display: flex;
  align-items: center;
  gap: 5px;
  border-radius: var(--radius-sm);
  transition: color 0.15s, background-color 0.15s;
}

.nav-label:hover {
  color: var(--text-primary);
  background-color: var(--bg-elevated);
  opacity: 1;
}

.nav-chevron {
  font-size: 10px;
  transition: transform 0.2s ease;
  color: var(--text-secondary);
  line-height: 1;
}

.nav-group:hover .nav-chevron {
  transform: rotate(180deg);
  color: var(--accent);
}

.nav-group.active .nav-label {
  color: var(--accent);
}

.nav-group.active .nav-chevron {
  color: var(--accent);
}

.dropdown {
  display: none;
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  background-color: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  min-width: 150px;
  flex-direction: column;
  padding: var(--spacing-sm);
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
}

.nav-group:hover .dropdown {
  display: flex;
}

.dropdown a {
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--text-secondary);
  display: block;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-base);
  transition: color 0.15s, background-color 0.15s;
}

.dropdown a:hover {
  background-color: var(--bg-surface);
  color: var(--accent);
  opacity: 1;
}

.nav-right {
  display: flex;
  gap: var(--spacing-lg);
  align-items: center;
}

.alerts-icon, .pin-icon {
  cursor: pointer;
  font-size: 18px;
}

.badge {
  display: inline-flex;
  background-color: var(--red);
  color: var(--bg-base);
  border-radius: 50%;
  width: 18px;
  height: 18px;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  font-weight: 700;
  margin-left: 2px;
  vertical-align: middle;
}

/* Clock widget */
.clock-widget {
  display: flex;
  align-items: center;
  gap: 8px;
}

.clock-digital {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  line-height: 1.2;
}

.clock {
  font-size: var(--font-size-sm);
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.03em;
}

.clock-tz {
  font-size: 9px;
  color: var(--text-secondary);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* Analog clock SVG */
.clock-face {
  fill: var(--bg-elevated);
  stroke: var(--text-secondary);
  stroke-width: 1.5;
}

.clock-tick {
  stroke: var(--border);
  stroke-width: 0.8;
}

.clock-tick-major {
  stroke: var(--text-secondary);
  stroke-width: 1.2;
}

.clock-hour {
  stroke: var(--text-primary);
  stroke-width: 2.5;
  stroke-linecap: round;
}

.clock-minute {
  stroke: var(--text-primary);
  stroke-width: 1.5;
  stroke-linecap: round;
}

.clock-second {
  stroke: var(--accent);
  stroke-width: 1;
  stroke-linecap: round;
}

.clock-center {
  fill: var(--accent);
}

/* Auto-hide on scroll down */
.nav-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  height: 100%;
}

.top-nav.hidden {
  transform: translateY(-100%);
}