/* =====================================================
   topbar.css — Top Navigation Bar
   ===================================================== */

#topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--topbar-h);
  background: rgba(28, 28, 30, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 12px;
  gap: 0;
  z-index: 100;
}

.tb-sep {
  width: 1px;
  height: 24px;
  background: var(--border);
  margin: 0 10px;
  flex-shrink: 0;
}

.tb-spacer { flex: 1; }

/* Navigation arrow buttons */
.tb-nav-btn {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-ui);
  border: none;
  background: transparent;
  color: var(--text2);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background var(--transition), color var(--transition);
}
.tb-nav-btn:hover { background: var(--bg3); color: var(--text1); }
.tb-nav-btn:disabled { opacity: 0.3; cursor: default; }
.tb-nav-btn:disabled:hover { background: transparent; }

/* Zoom slider */
.tb-zoom-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.tb-zoom-label {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text2);
  width: 36px;
  text-align: right;
  font-feature-settings: "tnum";
}

.tb-zoom-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 160px;
  height: 3px;
  border-radius: 2px;
  background: var(--bg3);
  outline: none;
  cursor: pointer;
}
.tb-zoom-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: #fff;
  cursor: pointer;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.4);
  transition: transform var(--transition);
}
.tb-zoom-slider::-webkit-slider-thumb:hover { transform: scale(1.15); }

/* Search input */
.tb-search-wrap { position: relative; flex-shrink: 0; }

.tb-search-icon {
  position: absolute;
  left: 9px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text3);
  pointer-events: none;
  display: flex;
}

#searchInput {
  width: 200px;
  height: 30px;
  border-radius: var(--radius-ui);
  border: 1px solid var(--border);
  background: var(--bg3);
  color: var(--text1);
  font-family: var(--font-ui);
  font-size: 13px;
  padding: 0 10px 0 32px;
  outline: none;
  transition: width var(--transition), border-color var(--transition), box-shadow var(--transition);
}
#searchInput:focus {
  width: 240px;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(10, 132, 255, 0.15);
}
#searchInput::placeholder { color: var(--text3); }

/* Topbar buttons */
.tb-btn {
  height: 30px;
  padding: 0 12px;
  border-radius: var(--radius-ui);
  border: none;
  font-family: var(--font-ui);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
  transition: background var(--transition), transform var(--transition);
}
.tb-btn:active { transform: scale(0.97); }
.tb-btn-primary { background: var(--accent); color: #fff; }
.tb-btn-primary:hover { background: #0077ed; }
.tb-btn-secondary { background: var(--bg3); color: var(--text1); }
.tb-btn-secondary:hover { background: var(--surface2); }