/* ==========================================================================
   History Drawer & Items
   ========================================================================== */

.history-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 50;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.history-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.history-drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  max-width: 380px;
  background: var(--drawer-bg);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-left: 1px solid var(--panel-border);
  box-shadow: -10px 0 40px rgba(0, 0, 0, 0.5);
  z-index: 60;
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

.history-drawer.open {
  transform: translateX(0);
}

/* Header */
.drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px;
  border-bottom: 1px solid var(--panel-border);
}

.drawer-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.drawer-title svg {
  width: 18px;
  height: 18px;
  stroke: var(--text-accent);
}

.drawer-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.clear-btn {
  background: transparent;
  border: 1px solid var(--panel-border);
  color: var(--btn-clear-color);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.clear-btn:hover {
  background: var(--btn-clear-bg);
  border-color: var(--btn-clear-border);
}

/* History List Content */
.history-list {
  flex: 1;
  overflow-y: auto;
  padding: 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.history-list::-webkit-scrollbar {
  width: 6px;
}
.history-list::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-full);
}

/* Empty State */
.history-empty {
  margin: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: var(--text-muted);
  text-align: center;
  padding: 40px 20px;
}

.history-empty-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  opacity: 0.5;
}

.history-empty-icon svg {
  width: 44px;
  height: 44px;
  stroke: currentColor;
}

.history-empty-text {
  font-size: 0.95rem;
}

/* History Item Card */
.history-item {
  background: var(--card-bg);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
}

.history-item:hover {
  border-color: var(--text-accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.history-item-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.history-time {
  font-size: 0.72rem;
  color: var(--text-muted);
}

.history-copy-icon {
  font-size: 0.78rem;
  color: var(--text-accent);
  display: flex;
  align-items: center;
  gap: 4px;
  opacity: 0;
  transition: opacity 0.2s;
}

.history-copy-icon svg {
  width: 13px;
  height: 13px;
  stroke: currentColor;
}

.history-item:hover .history-copy-icon {
  opacity: 1;
}

.history-expr {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: var(--text-secondary);
  word-break: break-all;
  text-align: right;
}

.history-result {
  font-family: var(--font-calc);
  font-size: 1.45rem;
  font-weight: 500;
  color: var(--lcd-green-bright);
  text-shadow: 0 0 8px var(--lcd-green-glow);
  letter-spacing: 0.04em;
  text-align: right;
}

.history-hint {
  font-size: 0.7rem;
  color: var(--text-accent);
  text-align: right;
  opacity: 0;
  transition: opacity 0.2s;
}

.history-item:hover .history-hint {
  opacity: 1;
}