/* =============================================================
   Snake Tactical MVP — Blocks & Workspace
   Logic Bloom — Gradients, hard shadows, 12px radius
   ============================================================= */

/* ===== Sidebar ===== */
.sidebar {
  display: flex;
  flex-direction: column;
  background: var(--bg-surface);
  border: 2px solid var(--border-dark);
  border-radius: var(--radius-md);
  overflow: hidden;
  flex-shrink: 0;
  z-index: 40;
  height: 100%;
  user-select: none;
  -webkit-user-select: none;
}

.sidebar__header {
  padding: var(--space-md);
  border-bottom: 2px solid var(--border-dark);
  flex-shrink: 0;
}

.sidebar__title {
  font-family: var(--font-mono);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text-bright);}

.sidebar__subtitle {
  font-family: var(--font-ui);
  font-size: 0.75rem;
  color: var(--color-text-dim);  margin-top: 0.25rem;
}

[data-theme="light"] .sidebar__subtitle {
  color: var(--color-dark);
}

.sidebar__categories {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.sidebar__category {
  display: flex;
  flex-direction: column;
}

.sidebar__category-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-text-subtle);  margin-bottom: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

[data-theme="light"] .sidebar__category-header {
  color: var(--color-dark);
}

.sidebar__category-dot {
  display: none;
}

.sidebar__category-dot--action { background: var(--color-action); }
.sidebar__category-dot--control { background: var(--color-control); }
.sidebar__category-dot--event { background: var(--color-events); }

.sidebar__category-items {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  list-style: none;
  padding-left: 0.5rem;
}

.sidebar__footer {
  padding: var(--space-md);
  border-top: 2px solid var(--border-dark);
  flex-shrink: 0;
}

/* ===== Block Base ===== */
.block {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: var(--space-sm);
  min-height: 2.25rem;
  padding: var(--space-sm) var(--space-md);
  padding-bottom: calc(var(--space-sm) + 1px);
  font-family: var(--font-mono);
  font-size: var(--text-sm-md);
  font-weight: 600;
  border-radius: var(--radius-block);
  cursor: grab;
  user-select: none;
  transition: filter var(--duration-quick) ease, opacity var(--duration-quick) ease;
  white-space: nowrap;
}

.block.block--action {
  background: var(--color-action);
  color: var(--color-action-text);
  clip-path: none;
  box-shadow: none;
}

.block.block--action:hover:not(.block--dragging) {
  filter: brightness(1.05);
}

.block.block--action--top,
.block.block--action--mid,
.block.block--action--bottom {
  clip-path: none;
  border-radius: var(--radius-block);
}

/* ===== C-Block (Loop / Conditional) ===== */
.c-block {
  position: relative;
  display: flex;
  flex-direction: column;
  border-radius: var(--radius-block);
  font-family: var(--font-mono);
  min-width: 10rem;
  cursor: grab;
  user-select: none;
  transition: filter var(--duration-quick) ease, opacity var(--duration-quick) ease;
}

.c-block:hover:not(.block--dragging) {
  filter: brightness(1.05);
}

.c-block--loop {
  background: var(--color-control);
  color: var(--color-control-text);
  box-shadow: none;
}

.c-block--event {
  background: var(--color-events);
  color: var(--color-events-text);
  box-shadow: none;
}

.c-block__header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  min-height: 2.25rem;
  font-size: var(--text-sm-md);
  font-weight: 600;
  border-radius: var(--radius-block) var(--radius-block) 0 0;
}

.c-block__label { font-family: var(--font-mono); font-weight: 600; white-space: nowrap; }

/* Block icons - color filters for contrast */
.block__icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  -webkit-user-drag: none;
  user-drag: none;
  pointer-events: none;
}

/* Prevent native drag on text and interactive elements inside blocks */
.c-block__label {
  -webkit-user-drag: none;
  user-drag: none;
  pointer-events: none;
}

.c-block__input,
.c-block__select {
  pointer-events: auto;
}

/* Icons in dark blocks (event/control) should be white */
.c-block--event .block__icon,
.c-block--loop .block__icon {
  filter: brightness(0) invert(1);
}

/* Light mode: keep icons black instead of white so they contrast with light block backgrounds */
[data-theme="light"] .c-block--event .block__icon,
[data-theme="light"] .c-block--loop .block__icon {
  filter: brightness(0);
}

/* Icons in action blocks (turquoise) remain black */
.block--action .block__icon {
  filter: brightness(0);
}

.c-block__input {
  background: var(--color-input-bg);
  color: var(--color-input-text);
  border: 1px solid var(--color-input-border);
  border-radius: var(--radius-full);
  padding: 0.125rem 0.5rem;
  font-family: var(--font-mono);
  font-size: var(--text-sm-md);
  font-weight: 700;
  min-width: 2.5rem;
  width: 3rem;
  text-align: center;
  cursor: text;
}

.c-block__input:disabled,
.c-block__select:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}

.c-block__input[type="number"]:focus {
  outline: 2px solid var(--color-executing);
  outline-offset: 1px;
}

.c-block__select {
  background: var(--color-input-bg);
  color: var(--color-input-text);
  border: 1px solid var(--color-input-border);
  border-radius: var(--radius-md);
  padding: 0.125rem 0.5rem;
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  font-weight: 700;
  cursor: pointer;
  min-width: auto;
  width: auto;
}

.c-block__select:focus {
  outline: 2px solid var(--color-executing);
  outline-offset: 1px;
}

.c-block__body {
  display: flex;
  position: relative;
  padding-bottom: var(--space-sm);
  border-radius: 0 0 var(--radius-block) var(--radius-block);
}

.c-block__spine {
  width: 0.5rem;
  background: rgba(255, 255, 255, 0.05);
  border-left: 2px solid rgba(255, 255, 255, 0.1);
  flex-shrink: 0;
  z-index: 0;
}

.c-block__dropzone {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0;
  padding: 0.5rem 0.5rem 0.5rem 0.75rem;
  margin-right: var(--space-xs);
  min-height: 3rem;
  border: 2px dashed rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-sm);
  transition: border-color 0.2s ease, background 0.2s ease, min-height 0.2s ease, padding 0.2s ease;
  background: rgba(0, 0, 0, 0.2);
}

.c-block__dropzone:empty {
  min-height: 2rem;
  padding: 0.25rem 0.5rem 0.25rem 0.5rem;
}

.c-block__dropzone:empty::after {
  content: '';
  display: block;
  min-height: 1.5rem;
}

/* ===== States ===== */
.block--dragging {
  cursor: grabbing;
}

.block--selected {
  outline: 3px solid var(--color-executing);
  outline-offset: 2px;
}

.block--executing {
  outline: 2px solid var(--color-executing);
  outline-offset: 2px;
  box-shadow: 0 0 1.25rem var(--color-executing-glow);
  animation: pulseExecutar var(--duration-glow) ease-in-out infinite;
  z-index: 10;
}

.c-block.block--executing {
  outline: 2px solid var(--color-executing);
  outline-offset: 2px;
  box-shadow: 0 0 1.25rem var(--color-executing-glow);
  animation: pulseExecutar var(--duration-glow) ease-in-out infinite;
}

@keyframes pulseExecutar {
  0%, 100% {
    outline-color: var(--color-executing);
    box-shadow: 0 0 1.25rem var(--color-executing-glow);
  }
  50% {
    outline-color: rgba(71, 242, 225, 0.3);
    box-shadow: 0 0 2rem var(--color-executing-glow);
  }
}

/* ===== Dropzone Snap Preview ===== */
.dropzone--snap-preview {
  border-color: var(--color-snap) !important;
  box-shadow: 0 0 1rem var(--color-snap), 0 0 2rem var(--color-snap);
  background: var(--color-snap-bg) !important;
}

/* ===== Snap Indicator ===== */
.snap-indicator {
  height: 0.375rem;
  background: var(--color-snap);
  border-radius: var(--radius-full);
  box-shadow: 0 0 0.625rem var(--color-snap);
  margin: 0 1rem;
  z-index: 20;
  animation: snapPulse 1s ease-in-out infinite;
}

@keyframes snapPulse {
  0%, 100% { opacity: 0.5; }
  50%      { opacity: 1; }
}

/* ===== Workspace ===== */
.workspace {
  display: flex;
  flex-direction: column;
  background: var(--bg-surface);
  border: 2px solid var(--border-dark);
  border-radius: var(--radius-md);
  overflow: hidden;
  min-height: 0;
  z-index: 30;
  height: 100%;
}

.workspace__area {
  flex: 1;
  padding: var(--space-xl);
  background-color: var(--bg-surface);
  overflow: auto;
  position: relative;
}

.workspace__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md);
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-dark);
  flex-shrink: 0;
}

.workspace__title {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-text-subtle);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

[data-theme="light"] .workspace__title {
  color: var(--color-dark);
}

.workspace__stack {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0;
  width: 100%;
  min-height: 8rem;
  position: relative;
}

.workspace__stack > .block--action + .block--action,
.workspace__stack > .c-block + .block--action {
  margin-top: 0;
}

/* ===== Controls Bar ===== */
.controls-bar {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md);
  background: var(--bg-elevated);
  border-top: 2px solid var(--border-dark);
  flex-shrink: 0;
}

.controls-bar__btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border: none;
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  color: var(--color-text-dim);  cursor: pointer;
  font-size: 1.125rem;
  transition: background 0.2s, color 0.2s;
}
.controls-bar__btn:hover { background: var(--bg-grid-line); color: var(--color-text-bright); }

.controls-bar__btn--clear {
  width: 2.5rem;
  height: 2.5rem;
  background: var(--color-clear-bg);
  color: var(--color-clear);
  margin-left: auto;
}
.controls-bar__btn--clear:hover { background: var(--color-clear); color: var(--color-danger-text); }

/* ===== Sidebar Reset Button ===== */
.sidebar__reset-btn {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  border: 2px solid var(--border-dark);
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--color-text-dim);  font-family: var(--font-mono);
  font-size: var(--text-sm-md);  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, transform 0.1s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  min-height: 2.5rem;
  border-bottom: 3px solid var(--border-dark);
}
.sidebar__reset-btn:hover { background: var(--bg-grid-line); color: var(--color-text-bright); }
.sidebar__reset-btn:active { transform: translateY(2px); border-bottom-width: 1px; }

/* ===== Delete Button per Block ===== */
.block__delete-btn {
  position: absolute;
  top: -0.375rem;
  right: -0.375rem;
  width: 1.125rem;
  height: 1.125rem;
  border-radius: 50%;
  background: var(--color-apple);
  color: var(--color-danger-text);
  border: 2px solid var(--bg-surface);
  font-size: var(--text-4xs);
  font-weight: 700;
  line-height: 1;
  cursor: pointer;
  opacity: 0;
  transform: scale(0.7);
  transition: opacity var(--duration-quick) ease, transform var(--duration-quick) ease;
  z-index: 20;
  pointer-events: none;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
}

.block:hover .block__delete-btn,
.c-block:hover .block__delete-btn {
  opacity: 1;
  transform: scale(1);
  pointer-events: auto;
}

.block__delete-btn:hover {
  background: var(--color-danger-hover);
  transform: scale(1.15);
}

/* Mobile tap-to-delete: show delete button when block is selected */
.block--delete-mode .block__delete-btn,
.c-block--delete-mode .block__delete-btn {
  opacity: 1;
  transform: scale(1);
  pointer-events: auto;
}

/* ===== Floating trash can for drag-to-delete ===== */
.trash-can {
  position: fixed;
  bottom: var(--space-xl);
  left: 50%;
  transform: translateX(-50%) scale(0.8);
  z-index: 999;
  background: var(--color-surface-neutral-elevated);
  border: 2px dashed var(--color-border-neutral);
  border-radius: var(--radius-md);
  padding: var(--space-between) var(--space-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2xs);
  opacity: 0;
  visibility: hidden;
  transition: opacity 200ms ease, transform 200ms ease, visibility 200ms ease;
  pointer-events: auto;
}

.trash-can--visible {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) scale(1);
}

.trash-can--active {
  border-color: var(--color-apple);
  background: var(--color-danger-hover);
  border-style: solid;
  transform: translateX(-50%) scale(1.1);
}

.trash-can .material-symbols-outlined {
  font-size: var(--text-xl);
  color: var(--color-apple);
  transition: color 200ms ease;
}

.trash-can__label {
  font-size: var(--text-xs);
  color: var(--color-text-bright);
  white-space: nowrap;
  transition: color 200ms ease;
}

.trash-can--active .material-symbols-outlined {
  color: var(--color-danger-text);
}

.trash-can--active .trash-can__label {
  color: var(--color-danger-text);
}

/* ===== Mobile ===== */
@media (max-width: 47.9375rem) {
  .sidebar {
    flex-direction: row;
    overflow-x: auto;
    overflow-y: hidden;
    border-right: none;
    border-bottom: 2px solid var(--border-dark);
    max-height: 7rem;
    padding: var(--space-sm);
    gap: var(--space-sm);
  }
  .sidebar__header { display: none; }
  .sidebar__footer { display: none; }
  .sidebar__categories { flex-direction: row; gap: var(--space-sm); padding: 0; }
  .sidebar__category { flex-shrink: 0; }
  .sidebar__category-header { margin-bottom: 0.25rem; font-size: 0.625rem; }
  .sidebar__category-items { flex-direction: row; gap: var(--space-sm); padding-left: 0; }
  .sidebar__category-dot { display: none; }
  .workspace__area { padding: var(--space-sm); }
  .app-header { padding: 0 var(--space-sm); }
  .app-header__title { font-size: 1rem; }
  .header-btn { padding: 0.375rem 0.75rem; font-size: 0.75rem; }
  .level-bar { padding: var(--space-xs) var(--space-sm); }
}