/* ============================================================
   AND_GAME — EDA / PCB Dark Theme
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@300;400;600;700&display=swap');

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg:           #0a0e14;
  --bg-panel:     #0f1520;
  --bg-panel-alt: #131a26;
  --border:       #1e2d45;
  --border-bright:#2a4060;
  --text-primary: #c8d8f0;
  --text-dim:     #4a6080;
  --text-muted:   #2a3a55;
  --accent-blue:  #1e90ff;
  --accent-cyan:  #00d4ff;
  --neon-green:   #39ff14;
  --neon-dim:     #1a7a00;
  --signal-low:   #c62828;
  --signal-none:  #3a3a3a;
  --gold:         #ffd700;
  --font:         'JetBrains Mono', 'Courier New', monospace;
}

/* ── Light Theme ─────────────────────────────────────────── */
body.light-theme {
  --bg:           #2a3040;
  --bg-panel:     #242a38;
  --bg-panel-alt: #1e2430;
  --border:       #3a4860;
  --border-bright:#506080;
  --text-primary: #c0cce0;
  --text-dim:     #708098;
  --text-muted:   #4a5a70;
  --accent-blue:  #4a90dd;
  --accent-cyan:  #40b8d8;
  --neon-green:   #50cc30;
  --neon-dim:     #308818;
  --signal-low:   #e04040;
  --signal-none:  #4a5868;
  --gold:         #ddaa22;
}

body.light-theme #game-canvas {
  filter: none;
}

body.light-theme #hud {
  background: linear-gradient(180deg, rgba(36,42,56,0.97) 0%, rgba(36,42,56,0.88) 100%);
  border-bottom-color: #3a4860;
}

body.light-theme .btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  border-color: #3a4860;
  color: #90a0b8;
}
body.light-theme .btn-secondary:hover {
  background: rgba(64, 184, 216, 0.12);
  border-color: #40b8d8;
  color: #c0cce0;
}

body.light-theme .gate-chip {
  background: #1e2430;
  border-color: #3a4860;
  color: #c0cce0;
}
body.light-theme .gate-chip:hover {
  border-color: #40b8d8;
  background: #2a3448;
  box-shadow: 0 0 8px rgba(64, 184, 216, 0.2);
}

body.light-theme #design-toolbar {
  background: rgba(36, 42, 56, 0.97);
  border-right-color: #3a4860;
}

body.light-theme .design-tool {
  background: #1e2430;
  border-color: #3a4860;
  color: #90a0b8;
}
body.light-theme .design-tool.active {
  border-color: #40b8d8;
  background: rgba(64, 184, 216, 0.15);
  color: #40b8d8;
}

body.light-theme #waveform-panel {
  background: #1e2430;
  border-top-color: #3a4860;
}

body.light-theme #review-bar {
  background: rgba(36, 42, 56, 0.97);
  border-top-color: #7050b0;
}

body.light-theme .review-step {
  background: #1e2430;
  border-color: #3a4860;
  color: #708098;
}
body.light-theme .review-step.active {
  border-color: #50cc30;
  background: rgba(80, 204, 48, 0.12);
  color: #50cc30;
}

body.light-theme #tutorial-box {
  background: #242a38;
  border-color: #50cc30;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}
body.light-theme #tutorial-text {
  color: #c0cce0;
}

body.light-theme #menu-overlay,
body.light-theme #win-overlay,
body.light-theme #hint-overlay,
body.light-theme #info-overlay,
body.light-theme #truth-overlay,
body.light-theme #diagram-overlay,
body.light-theme #instruction-overlay,
body.light-theme #fail-overlay,
body.light-theme #final-overlay,
body.light-theme #gallery-overlay,
body.light-theme #gallery-save-overlay {
  background: rgba(30, 36, 48, 0.85);
  backdrop-filter: blur(8px);
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text-primary);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
}

/* ── Canvas ─────────────────────────────────────────────── */

#game-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: block;
  cursor: default;
}

/* ── HUD ─────────────────────────────────────────────────── */

#hud {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  min-height: 56px;
  background: linear-gradient(180deg, rgba(10,14,20,0.98) 0%, rgba(10,14,20,0.85) 100%);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px 18px;
  z-index: 100;
  backdrop-filter: blur(8px);
  box-shadow: 0 2px 24px rgba(0,0,0,0.6);
}

#hud-left,
#hud-right {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 240px;
}

#hud-left {
  margin-left: 10px;
}

#hud-right {
  margin-right: 4px;
}

#hud-right {
  align-items: flex-end;
}

#gate-palette-label-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

#level-label,
#gate-palette-label {
  font-size: 9px;
  letter-spacing: 3px;
  color: var(--text-dim);
  text-transform: uppercase;
}

#btn-info {
  width: 34px;
  height: 34px;
  border-radius: 999px;
  border: 2px solid var(--accent-cyan);
  background: rgba(0, 212, 255, 0.16);
  color: var(--accent-cyan);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0;
  padding: 0;
  line-height: 1;
  text-transform: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 14px rgba(0, 212, 255, 0.22);
}

#btn-info:hover {
  background: rgba(0, 212, 255, 0.28);
  box-shadow: 0 0 18px rgba(0, 212, 255, 0.45);
}

#btn-info:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 2px;
}

/* ── Design Mode Toolbar ─────────────────────────────────── */

#design-toolbar {
  position: fixed;
  top: 90px;
  left: 0;
  width: 200px;
  bottom: 0;
  background: rgba(10, 14, 20, 0.97);
  border-right: 2px solid #1e3a50;
  z-index: 150;
  display: flex;
  flex-direction: column;
  padding: 16px 12px;
  gap: 10px;
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: none;
}
#design-toolbar::-webkit-scrollbar {
  display: none;
}

#design-toolbar.hidden {
  display: none;
}

#design-toolbar-title {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 2px;
  color: #a060ff;
  text-align: center;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(160, 96, 255, 0.3);
}

#design-tools {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.design-tool {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1.5px;
  padding: 9px 12px;
  border: 1px solid #2a5a90;
  border-radius: 6px;
  background: rgba(42, 90, 144, 0.1);
  color: #a0c8ff;
  cursor: pointer;
  text-align: center;
  transition: background 0.15s, border-color 0.15s;
}

.design-tool:hover {
  background: rgba(42, 90, 144, 0.25);
  border-color: #00d4ff;
}

.design-tool.active {
  background: rgba(0, 212, 255, 0.2);
  border-color: #00d4ff;
  color: #00d4ff;
  box-shadow: 0 0 8px rgba(0, 212, 255, 0.25);
}

.design-tool-danger {
  border-color: #6a1a1a;
  color: #ff5252;
  background: rgba(198, 40, 40, 0.08);
}

.design-tool-danger:hover {
  background: rgba(198, 40, 40, 0.2);
  border-color: #c62828;
}

.design-tool-danger.active {
  background: rgba(198, 40, 40, 0.3);
  border-color: #ff5252;
  box-shadow: 0 0 8px rgba(255, 82, 82, 0.25);
}

#design-props {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 10px 6px;
  border-top: 1px solid rgba(160, 96, 255, 0.2);
  border-bottom: 1px solid rgba(160, 96, 255, 0.2);
}

#design-props.hidden { display: none; }

#design-props-title {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1.5px;
  color: #a060ff;
  text-align: center;
}

#design-props-type {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: #00d4ff;
  text-align: center;
  margin-bottom: 4px;
}

.design-prop-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: #888;
}

.design-prop-row input {
  width: 80px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  padding: 4px 6px;
  border: 1px solid #2a5a90;
  border-radius: 4px;
  background: #0a0e14;
  color: #c8d8f0;
  outline: none;
}

.design-prop-row input:focus {
  border-color: #00d4ff;
}

#prop-steps, #prop-step-targets {
  width: 100px;
  letter-spacing: 1px;
}

.design-prop-toggle {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  font-weight: 700;
  width: 36px;
  height: 28px;
  border: 1px solid #2a5a90;
  border-radius: 4px;
  background: rgba(42, 90, 144, 0.15);
  color: #a0c8ff;
  cursor: pointer;
  transition: background 0.15s;
}

.design-prop-action {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  font-weight: 700;
  padding: 4px 8px;
  border: 1px solid #2a6a8a;
  border-radius: 4px;
  background: #0d2030;
  color: #8fd4ff;
  cursor: pointer;
  letter-spacing: 0.5px;
  transition: background 0.15s;
}
.design-prop-action:hover { background: #163a5a; color: #ffffff; }
.design-prop-action[disabled] {
  opacity: 0.45; cursor: not-allowed; color: #678; border-color: #1a3040;
}

.design-prop-toggle:hover {
  background: rgba(42, 90, 144, 0.3);
}

#design-actions {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-top: 10px;
  border-top: 1px solid rgba(160, 96, 255, 0.2);
}

.design-action {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1.5px;
  padding: 9px 12px;
  border: 1px solid #a060ff;
  border-radius: 6px;
  background: rgba(160, 96, 255, 0.1);
  color: #a060ff;
  cursor: pointer;
  text-align: center;
  transition: background 0.15s;
}

.design-action:hover {
  background: rgba(160, 96, 255, 0.25);
}

.design-action-danger {
  border-color: #6a1a1a;
  color: #ff5252;
  background: rgba(198, 40, 40, 0.08);
}

.design-action-danger:hover {
  background: rgba(198, 40, 40, 0.2);
}

.design-action-share {
  border-color: #1a6a1a;
  color: #39ff14;
  background: rgba(57, 255, 20, 0.08);
}
.design-action-share:hover {
  background: rgba(57, 255, 20, 0.2);
}

#btn-design-undo, #btn-design-redo {
  border-color: #a06000;
  color: #ffaa00;
  background: rgba(255, 170, 0, 0.08);
}
#btn-design-undo:hover, #btn-design-redo:hover {
  background: rgba(255, 170, 0, 0.2);
}

/* ── Shortcut Tooltip ───────────────────────────────────── */
[data-shortcut] {
  position: relative;
}
[data-shortcut]:hover::after {
  content: attr(data-shortcut);
  position: absolute;
  left: calc(100% + 10px);
  top: 50%;
  transform: translateY(-50%);
  background: #1a1a2e;
  color: #ffcc00;
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  font-weight: 700;
  padding: 4px 8px;
  border-radius: 6px;
  border: 1px solid #ffcc0044;
  box-shadow: 0 2px 8px rgba(0,0,0,0.5);
  white-space: nowrap;
  pointer-events: none;
  z-index: 999;
  animation: tooltip-pop 0.15s ease-out;
}
@keyframes tooltip-pop {
  from { opacity: 0; transform: translateY(-50%) translateX(-4px); }
  to   { opacity: 1; transform: translateY(-50%) translateX(0); }
}

/* ── Tutorial Overlay ────────────────────────────────────── */

#tutorial-overlay {
  position: fixed;
  inset: 0;
  z-index: 300;
  pointer-events: none;
}
#tutorial-overlay.hidden { display: none; }

#tutorial-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  pointer-events: auto;
}

#tutorial-box {
  position: absolute;
  background: #0d1117;
  border: 2px solid #39ff14;
  border-radius: 12px;
  padding: 16px 20px;
  max-width: 340px;
  pointer-events: auto;
  box-shadow: 0 0 30px rgba(57, 255, 20, 0.2);
  animation: overlayIn 0.3s ease-out;
}

#tutorial-step-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 9px;
  letter-spacing: 2px;
  color: #39ff14;
  margin-bottom: 8px;
}

#tutorial-text {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  color: #c8d8f0;
  line-height: 1.5;
  margin-bottom: 14px;
}

#tutorial-buttons {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
}

#btn-tutorial-next {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1px;
  padding: 6px 16px;
  border: 2px solid #39ff14;
  border-radius: 6px;
  background: rgba(57, 255, 20, 0.1);
  color: #39ff14;
  cursor: pointer;
}
#btn-tutorial-next:hover {
  background: rgba(57, 255, 20, 0.25);
}

#btn-tutorial-skip {
  font-size: 10px;
  padding: 5px 12px;
  opacity: 0.7;
}

#tutorial-arrow {
  position: absolute;
  width: 0;
  height: 0;
  border: 10px solid transparent;
  pointer-events: none;
}
#tutorial-arrow.arrow-down {
  border-top-color: #39ff14;
}
#tutorial-arrow.arrow-up {
  border-bottom-color: #39ff14;
}
#tutorial-arrow.arrow-left {
  border-right-color: #39ff14;
}
#tutorial-arrow.arrow-right {
  border-left-color: #39ff14;
}

#btn-reset-inputs {
  border-color: #e67e22;
  color: #e67e22;
  background: rgba(230, 126, 34, 0.1);
  font-size: 8px;
  letter-spacing: 1px;
  animation: overlayIn 0.3s ease-out;
}
#btn-reset-inputs:hover {
  background: rgba(230, 126, 34, 0.25);
}

#btn-explain {
  border-color: #ffcc00;
  color: #ffcc00;
  background: rgba(255, 204, 0, 0.1);
  font-size: 12px;
  letter-spacing: 2px;
}
#btn-explain:hover {
  background: rgba(255, 204, 0, 0.25);
  box-shadow: 0 0 12px rgba(255, 204, 0, 0.3);
}

#btn-review {
  border-color: #a060ff;
  color: #a060ff;
  background: rgba(160, 96, 255, 0.1);
  font-size: 12px;
  letter-spacing: 2px;
}
#btn-review:hover {
  background: rgba(160, 96, 255, 0.25);
  box-shadow: 0 0 12px rgba(160, 96, 255, 0.3);
}

/* ── Review Mode Bar ─────────────────────────────────────── */

#review-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 56px;
  background: rgba(10, 14, 20, 0.97);
  border-top: 2px solid #a060ff;
  z-index: 180;
  display: flex;
  align-items: center;
  padding: 0 16px;
  gap: 12px;
}
#review-bar.hidden {
  display: none;
}

#review-timeline {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: none;
}
#review-timeline::-webkit-scrollbar { display: none; }

.review-step {
  min-width: 36px;
  height: 30px;
  border-radius: 6px;
  border: 2px solid #2a5a90;
  background: rgba(14, 31, 51, 0.96);
  color: #888;
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}
.review-step:hover {
  border-color: #00d4ff;
  color: #00d4ff;
}
.review-step.active {
  border-color: #39ff14;
  background: rgba(57, 255, 20, 0.15);
  color: #39ff14;
  box-shadow: 0 0 12px rgba(57, 255, 20, 0.3);
}

.review-btn {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1px;
  padding: 6px 12px;
  border: 1px solid #a060ff;
  border-radius: 4px;
  background: rgba(160, 96, 255, 0.08);
  color: #a060ff;
  cursor: pointer;
  white-space: nowrap;
}
.review-btn:hover {
  background: rgba(160, 96, 255, 0.2);
}
.review-exit {
  border-color: #ff5252;
  color: #ff5252;
  background: rgba(255, 82, 82, 0.08);
}
.review-exit:hover {
  background: rgba(255, 82, 82, 0.2);
}

/* ── Waveform Panel ──────────────────────────────────────── */

#waveform-panel {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 220px;
  min-height: 120px;
  background: #0a0e14;
  z-index: 200;
  display: flex;
  flex-direction: column;
  /* Only animate show/hide — not the size itself, so the canvas stays in
     sync during manual resize and fullscreen toggles. */
  transition: transform 0.35s ease-out, opacity 0.35s ease-out;
}

/* Full-screen mode — panel fills the viewport. Instant, no animation,
   so the canvas gets a single, correct size to render against. */
#waveform-panel.fullscreen {
  top: 0 !important;
  height: 100vh !important;
  z-index: 500;
}

/* Top-edge drag handle for vertical resize of the waveform panel.
   Occupies the full top edge of the panel. No dark border above it —
   the cyan strip *is* the top of the panel, so the resize affordance is
   the very first thing the cursor hits when approaching from above. */
#waveform-resize-top {
  flex: 0 0 auto;
  height: 14px;
  cursor: ns-resize;
  background: #0f2030;
  border-top: 2px solid #00d4ff;
  border-bottom: 1px solid rgba(0,212,255,0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  user-select: none;
  position: relative;
  z-index: 1;
}
#waveform-resize-top::before,
#waveform-resize-top::after {
  content: '';
  width: 28px;
  height: 2px;
  background: #00d4ff;
  border-radius: 1px;
  pointer-events: none;
}
#waveform-resize-top:hover {
  background: #163040;
  border-top-color: #6be4ff;
}
#waveform-resize-top:hover::before,
#waveform-resize-top:hover::after {
  background: #6be4ff;
}

#waveform-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  background: rgba(14,22,33,0.95);
  border-bottom: 1px solid #1e3a50;
  min-height: 40px;
}

#waveform-hint {
  font: 10px 'JetBrains Mono', monospace;
  color: #4a6080;
  letter-spacing: 0.5px;
  user-select: none;
}

#waveform-title {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 2px;
  color: #00d4ff;
}

.btn-waveform-ctrl {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1px;
  padding: 6px 14px;
  border: 1px solid #2a4a68;
  border-radius: 4px;
  background: rgba(30,58,80,0.45);
  color: #c8d8f0;
  cursor: pointer;
  transition: background 0.18s, color 0.18s, border-color 0.18s;
}

.btn-waveform-ctrl:hover {
  background: rgba(0,212,255,0.18);
  color: #ffffff;
  border-color: #00d4ff;
}

.btn-waveform-ctrl.active {
  background: rgba(255,204,0,0.20);
  color: #ffcc00;
  border-color: #ffcc00;
}

.btn-waveform-ctrl.fired {
  background: rgba(57,255,20,0.22);
  color: #39ff14;
  border-color: #39ff14;
}

/* Compact by default; on focus the text GROWS (font + padding), not the width,
   so the query is easier to read while staying in place. */
input.wf-search-input {
  width: 240px;
  margin: 0 6px 0 0;
  padding: 3px 8px;
  background: #0a1520;
  border: 1px solid #1e3040;
  border-radius: 3px;
  color: #c8d8f0;
  font: 10px 'JetBrains Mono', monospace;
  outline: none;
  transition: font-size 0.2s ease-out, padding 0.2s ease-out, border-color 0.2s;
  box-shadow: none;
  -webkit-appearance: none;
          appearance: none;
}
input.wf-search-input:focus {
  font-size: 14px;
  padding: 8px 10px;
  border-color: #00d4ff;
}
input.wf-search-input::placeholder {
  color: #2a4060;
}

/* Body wraps the optional Signal Picker sidebar + the main waveform canvas. */
#waveform-body {
  flex: 1;
  display: flex;
  min-height: 0;
}

#waveform-canvas {
  flex: 1;
  width: 100%;
}

/* Signal Picker — hidden by default. Toggled via the ◨ SIGNALS button.
   Wide enough to fit both header buttons (CLEAR ALL + RECOMMENDED) on one row. */
#waveform-picker {
  width: 280px;
  flex: 0 0 280px;
  background: #0a1016;
  border-right: 1px solid #1e3a50;
  display: none;
  flex-direction: column;
  min-height: 0;
}
#waveform-panel.picker-open #waveform-picker {
  display: flex;
}

#waveform-picker-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 8px 10px;
  border-bottom: 1px solid #1e3a50;
  font: bold 11px 'JetBrains Mono', monospace;
  color: #00d4ff;
  letter-spacing: 1.2px;
}
#waveform-picker-actions {
  display: flex;
  gap: 6px;
}

#btn-picker-recommended,
#btn-picker-clear {
  font: bold 10px 'JetBrains Mono', monospace;
  padding: 6px 12px;
  border-radius: 4px;
  cursor: pointer;
  letter-spacing: 1.2px;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}
#btn-picker-recommended {
  background: rgba(0,212,255,0.18);
  color: #00d4ff;
  border: 1px solid #00d4ff;
}
#btn-picker-recommended:hover {
  background: rgba(0,212,255,0.35);
  color: #ffffff;
}
#btn-picker-clear {
  background: #2a1010;
  color: #ff6666;
  border: 1px solid #4a2020;
}
#btn-picker-clear:hover {
  background: #3a1818;
  color: #ff8888;
  border-color: #ff6666;
}

#waveform-picker-search {
  margin: 6px 10px;
  padding: 3px 8px;
  background: #0a1520;
  border: 1px solid #1e3040;
  border-radius: 3px;
  color: #c8d8f0;
  font: 10px 'JetBrains Mono', monospace;
  outline: none;
  -webkit-appearance: none;
          appearance: none;
  /* Grow the typography (not the width) on focus so the text is readable. */
  transition: font-size 0.2s ease-out, padding 0.2s ease-out, border-color 0.2s;
}
#waveform-picker-search:focus {
  font-size: 14px;
  padding: 8px 10px;
  border-color: #00d4ff;
}
#waveform-picker-search::placeholder {
  color: #2a4060;
}

#waveform-picker-list {
  flex: 1 1 auto;
  overflow-y: auto;
  padding: 4px 0;
}

.wf-pick-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  cursor: pointer;
  font: 14px 'JetBrains Mono', monospace;
  transition: background 0.1s;
}
.wf-pick-row:hover {
  background: rgba(0,212,255,0.08);
}
.wf-pick-row input[type="checkbox"] {
  accent-color: #00d4ff;
  cursor: pointer;
}
.wf-pick-row .wf-pick-label {
  flex: 1;
  color: #c8d8f0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.wf-pick-row .wf-pick-type {
  font-size: 8px;
  color: #4a6080;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
/* Section banner above the flat "recommended" list at the top of the picker. */
.wf-pick-banner {
  padding: 8px 10px 6px;
  font: bold 10px 'JetBrains Mono', monospace;
  color: #00d4ff;
  letter-spacing: 2px;
  background: rgba(0,212,255,0.10);
  border-bottom: 1px solid rgba(0,212,255,0.25);
}

/* Category banner — single horizontal stripe above each batch of components. */
.wf-pick-cat {
  padding: 6px 10px 3px;
  font: bold 8px 'JetBrains Mono', monospace;
  color: #4a6080;
  letter-spacing: 1px;
  margin-top: 6px;
  border-top: 1px solid #12202c;
}
.wf-pick-cat:first-child {
  margin-top: 0;
  border-top: none;
}

/* Component header — collapsible parent showing N/M pins selected. */
.wf-pick-comp {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 7px 10px;
  cursor: pointer;
  font: bold 13px 'JetBrains Mono', monospace;
  color: #00d4ff;
  transition: background 0.1s;
}
.wf-pick-comp:hover { background: rgba(0,212,255,0.08); }
.wf-pick-tri {
  display: inline-block;
  width: 10px;
  text-align: center;
  color: #00d4ff;
}
.wf-pick-comp-label { flex: 1; }
.wf-pick-comp-count {
  font-size: 8px;
  color: #4a6080;
  letter-spacing: 0.5px;
}

/* "inputs" / "outputs" sub-header within a component. */
.wf-pick-subhead {
  padding: 5px 10px 3px 28px;
  font: bold 11px 'JetBrains Mono', monospace;
  color: #7090b0;
  letter-spacing: 1.5px;
  text-transform: uppercase;
}

/* Pin row indented under a component header. */
.wf-pick-row.wf-pick-child {
  padding-left: 30px;
}

/* Button "active" state for the picker toggle (matches TRIG / MEM styling). */
.btn-waveform-ctrl.picker-on {
  background: rgba(0,212,255,0.25);
  color: #00d4ff;
  border-color: #00d4ff;
}

/* Per-signal context menu inside the Waveform panel. */
#waveform-ctx-menu {
  position: absolute;
  min-width: 160px;
  padding: 4px 0;
  background: #0e1620;
  border: 1px solid #1e3a50;
  border-radius: 4px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.6);
  font: 11px 'JetBrains Mono', monospace;
  z-index: 210;
}
#waveform-ctx-menu .wf-menu-item {
  padding: 5px 12px;
  color: #c8d8f0;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  gap: 12px;
}
#waveform-ctx-menu .wf-menu-item:hover {
  background: rgba(0,212,255,0.15);
  color: #00d4ff;
}
#waveform-ctx-menu .wf-menu-item.wf-menu-header {
  color: #4a6080;
  cursor: default;
  font-weight: bold;
  padding-top: 4px;
  padding-bottom: 4px;
}
#waveform-ctx-menu .wf-menu-item.wf-menu-header:hover {
  background: transparent;
  color: #4a6080;
}
#waveform-ctx-menu .wf-menu-sep {
  height: 1px;
  background: #1e3a50;
  margin: 3px 0;
}
#waveform-ctx-menu .wf-menu-hint {
  color: #4a6080;
  font-size: 9px;
}

#waveform-panel.hidden {
  transform: translateY(100%);
  opacity: 0;
  pointer-events: none;
}

#btn-undo {
  font-size: 8px;
  font-weight: 700;
  letter-spacing: 1px;
  padding: 3px 8px;
  border: 1px solid #e67e22;
  border-radius: 4px;
  background: rgba(230, 126, 34, 0.15);
  color: #e67e22;
  cursor: pointer;
  transition: background 0.2s, box-shadow 0.2s;
}

#btn-undo:hover {
  background: rgba(230, 126, 34, 0.3);
  box-shadow: 0 0 10px rgba(230, 126, 34, 0.3);
}

#btn-waveform {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1.5px;
  padding: 6px 14px;
  border: 2px solid #00d4ff;
  border-radius: 6px;
  background: rgba(0, 212, 255, 0.1);
  color: #00d4ff;
  cursor: pointer;
  transition: background 0.2s, box-shadow 0.2s;
}

#btn-waveform:hover {
  background: rgba(0, 212, 255, 0.25);
  box-shadow: 0 0 14px rgba(0, 212, 255, 0.35);
}

#btn-waveform.active {
  background: rgba(0, 212, 255, 0.3);
  box-shadow: 0 0 16px rgba(0, 212, 255, 0.5);
  border-color: #39ff14;
  color: #39ff14;
}

#btn-clear-gates {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 1.5px;
  padding: 5px 12px;
  border: 1px solid #c62828;
  border-radius: 4px;
  background: rgba(198, 40, 40, 0.12);
  color: #ff5252;
  cursor: pointer;
  transition: background 0.2s, box-shadow 0.2s;
}

#btn-clear-gates:hover {
  background: rgba(198, 40, 40, 0.3);
  box-shadow: 0 0 12px rgba(198, 40, 40, 0.3);
}

#level-status-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 2px;
}

#level-name {
  font-size: 13px;
  font-weight: 700;
  color: var(--accent-cyan);
  letter-spacing: 1px;
  white-space: nowrap;
  line-height: 1.2;
}

#level-time-row {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

#level-time,
#level-best {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  font-size: 10px;
  letter-spacing: 1px;
  font-weight: 700;
  padding: 3px 8px;
  border: 1px solid var(--border-bright);
  border-radius: 4px;
  color: var(--text-dim);
  text-transform: uppercase;
}

#level-time {
  color: var(--accent-cyan);
  background: rgba(0, 212, 255, 0.08);
}

#level-best {
  color: rgba(57, 255, 20, 0.85);
  background: rgba(57, 255, 20, 0.06);
}

#hud-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 4px;
  flex-wrap: wrap;
}

#btn-levels,
#btn-hint {
  width: fit-content;
  align-self: flex-start;
}

#btn-hint {
  border-color: rgba(255, 215, 0, 0.55);
  color: #ffd700;
  background: rgba(255, 215, 0, 0.08);
}

#btn-hint:hover {
  background: rgba(255, 215, 0, 0.18);
  box-shadow: 0 0 18px rgba(255, 215, 0, 0.18);
  color: #fff;
}

#btn-theme {
  border-color: rgba(255, 204, 0, 0.55);
  color: #ffcc00;
  background: rgba(255, 204, 0, 0.08);
  font-size: 18px;
  padding: 2px 6px;
  line-height: 1;
}
#btn-theme:hover {
  background: rgba(255, 204, 0, 0.18);
}

#btn-mute {
  border-color: rgba(160, 96, 255, 0.55);
  color: #a060ff;
  background: rgba(160, 96, 255, 0.08);
  font-size: 18px;
  padding: 2px 6px;
  line-height: 1;
}
#btn-mute:hover {
  background: rgba(160, 96, 255, 0.18);
}
#btn-mute.muted {
  border-color: rgba(100, 100, 100, 0.55);
  color: #666;
  background: rgba(100, 100, 100, 0.08);
}

#hud-center {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

#hud-title {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 6px;
  color: var(--text-primary);
  text-shadow: 0 0 12px rgba(0, 212, 255, 0.4);
}

#hud-subtitle {
  font-size: 8px;
  letter-spacing: 4px;
  color: var(--text-dim);
}

/* Instruction Overlay */
#instruction-overlay {
  z-index: 250;
}

#instruction-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  padding: 52px 64px;
  background: var(--bg-panel);
  border: 1px solid var(--border-bright);
  border-radius: 8px;
  box-shadow:
    0 0 80px rgba(0, 212, 255, 0.15),
    0 0 160px rgba(0, 212, 255, 0.06),
    inset 0 1px 0 rgba(255,255,255,0.04);
  animation: slideUp 0.35s cubic-bezier(0.22, 1, 0.36, 1);
  max-width: 520px;
  text-align: center;
}

#instruction-box.fullscreen-diagram {
  max-width: 95vw;
  max-height: 90vh;
  padding: 24px 32px;
  overflow: auto;
}

#instruction-box.fullscreen-diagram svg {
  width: 90vw;
  height: auto;
  max-height: 70vh;
}

#instruction-level-name {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: 6px;
  color: #00d4ff;
  text-transform: uppercase;
}

#instruction-text {
  font-size: 20px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--text-primary);

  white-space: pre-line;
}

#btn-start {
  margin-top: 8px;
  padding: 12px 48px;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 4px;
  color: #0a0e14;
  background: #00d4ff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
}

#btn-start:hover {
  background: #33e0ff;
  transform: scale(1.04);
}

#btn-start:active {
  transform: scale(0.97);
}

/* Gate Palette Chips */
#gate-palette {
  display: flex;
  gap: 7px;
  flex-wrap: nowrap;
  padding: 4px;
  border-radius: 6px;
  transition: box-shadow 0.25s, background 0.25s;
}
#chip-tooltip {
  position: absolute;
  background: rgba(10, 14, 20, 0.96);
  border: 2px solid #00d4ff;
  border-radius: 10px;
  padding: 12px 16px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  color: #c8d8f0;
  pointer-events: none;
  z-index: 50;
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.6);
  white-space: nowrap;
  animation: tooltip-pop 0.15s ease-out;
}
#chip-tooltip.hidden { display: none; }
#chip-tooltip table { border-collapse: collapse; }
#chip-tooltip th {
  color: #00d4ff;
  padding: 3px 10px;
  border-bottom: 1px solid #1e3a50;
  font-weight: 700;
  font-size: 13px;
}
#chip-tooltip td {
  padding: 3px 10px;
  text-align: center;
  font-size: 13px;
}
#chip-tooltip td.v1 { color: #39ff14; font-weight: 700; }
#chip-tooltip td.v0 { color: #c62828; font-weight: 700; }
#chip-tooltip .chip-tt-name {
  color: #00d4ff;
  font-weight: 700;
  font-size: 15px;
  margin-bottom: 6px;
}
#chip-tooltip .chip-tt-formula {
  color: #ffcc00;
  font-weight: 700;
  margin-top: 6px;
  font-size: 13px;
}

#drag-ghost {
  position: fixed;
  pointer-events: none;
  z-index: 500;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1px;
  padding: 8px 16px;
  border-radius: 8px;
  border: 2px solid #00d4ff;
  background: rgba(0, 212, 255, 0.15);
  color: #00d4ff;
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.4);
  transform: translate(-50%, -50%) scale(1.1);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
#drag-ghost.hidden { display: none; }
#drag-ghost.snap {
  border-color: #39ff14;
  background: rgba(57, 255, 20, 0.2);
  color: #39ff14;
  box-shadow: 0 0 30px rgba(57, 255, 20, 0.5);
  transform: translate(-50%, -50%) scale(1.2);
}
#drag-ghost.ff-ghost {
  border-color: #a060ff;
  background: rgba(160, 96, 255, 0.15);
  color: #a060ff;
  box-shadow: 0 0 20px rgba(160, 96, 255, 0.4);
}
#drag-ghost.ff-ghost.snap {
  border-color: #39ff14;
  background: rgba(57, 255, 20, 0.2);
  color: #39ff14;
  box-shadow: 0 0 30px rgba(57, 255, 20, 0.5);
}

#gate-palette.highlight {
  box-shadow: 0 0 18px rgba(0, 212, 255, 0.4);
  background: rgba(0, 212, 255, 0.08);
}

.gate-chip {
  font-size: 11px;
  font-family: var(--font);
  font-weight: 600;
  letter-spacing: 1px;
  padding: 8px 12px;
  border: 1px solid var(--border-bright);
  border-radius: 5px;
  color: var(--accent-cyan);
  background: rgba(30, 144, 255, 0.06);
  transition: all 0.15s ease;
  user-select: none;
  cursor: grab;
}

.gate-chip.active {
  background: rgba(0, 212, 255, 0.15);
  border-color: var(--accent-cyan);
  color: #fff;
  box-shadow: 0 0 8px rgba(0,212,255,0.3);
}

.gate-chip.dragging {
  opacity: 0.55;
  transform: scale(0.96);
  cursor: grabbing;
}

/* FF palette (sequential levels only) */
#ff-palette {
  margin-top: 5px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  align-items: flex-end;
  padding: 4px;
  border-radius: 6px;
  transition: box-shadow 0.25s, background 0.25s;
}
#ff-palette.highlight {
  box-shadow: 0 0 18px rgba(160, 96, 255, 0.4);
  background: rgba(160, 96, 255, 0.08);
}
}

#ff-palette.hidden {
  display: none;
}

#ff-palette-label {
  font-size: 9px;
  letter-spacing: 3px;
  color: var(--text-dim);
  text-transform: uppercase;
}

#ff-chips {
  display: flex;
  gap: 5px;
}

.ff-chip.hidden {
  display: none;
}
.ff-chip {
  color: #c080ff;
  border-color: #5a2a9a;
  background: rgba(90, 42, 154, 0.12);
}

.ff-chip.active {
  background: rgba(160, 96, 255, 0.2);
  border-color: #a060ff;
  color: #fff;
  box-shadow: 0 0 8px rgba(160, 96, 255, 0.4);
}

/* ── Fail Overlay ────────────────────────────────────────── */

#fail-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(6px);
  animation: fadeIn 0.4s ease;
}

#fail-box {
  background: linear-gradient(135deg, #1a0a0a 0%, #2a1010 100%);
  border: 2px solid #cc3333;
  border-radius: 16px;
  padding: 32px 40px;
  text-align: center;
  max-width: 400px;
  box-shadow: 0 0 40px rgba(204, 51, 51, 0.3);
}

#fail-title {
  font-family: 'JetBrains Mono', monospace;
  font-size: 24px;
  font-weight: bold;
  color: #ff4444;
  margin-bottom: 16px;
}

#fail-message {
  font-family: 'JetBrains Mono', monospace;
  font-size: 14px;
  color: #cc9999;
  margin-bottom: 24px;
  line-height: 1.5;

}

#btn-fail-retry {
  font-family: 'JetBrains Mono', monospace;
  font-size: 14px;
  font-weight: bold;
  padding: 10px 28px;
  border: 2px solid #cc3333;
  border-radius: 8px;
  background: rgba(204, 51, 51, 0.2);
  color: #ff6666;
  cursor: pointer;
  transition: all 0.2s;
}

#btn-fail-retry:hover {
  background: rgba(204, 51, 51, 0.4);
  color: #fff;
}

#fail-buttons {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

#btn-fail-solve {
  font-family: 'JetBrains Mono', monospace;
  font-size: 14px;
  font-weight: bold;
  padding: 10px 28px;
  border: 2px solid #ffcc00;
  border-radius: 8px;
  background: rgba(255, 204, 0, 0.15);
  color: #ffcc00;
  cursor: pointer;
  transition: all 0.2s;
}
#btn-fail-solve:hover {
  background: rgba(255, 204, 0, 0.35);
  color: #fff;
}
#btn-fail-solve.hidden { display: none; }

/* ── Win Overlay ─────────────────────────────────────────── */

#win-overlay,
#final-overlay,
#menu-overlay,
#hint-overlay,
#diagram-overlay,
#info-overlay,
#truth-overlay,
#instruction-overlay,
#gallery-overlay,
#gallery-save-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(6px);
  animation: overlayIn 0.35s ease-out;
}

@keyframes overlayIn {
  from { opacity: 0; transform: scale(0.95); }
  to   { opacity: 1; transform: scale(1); }
}

#fail-overlay.hidden,
#win-overlay.hidden,
#final-overlay.hidden,
#menu-overlay.hidden,
#hint-overlay.hidden,
#diagram-overlay.hidden,
#info-overlay.hidden,
#truth-overlay.hidden,
#instruction-overlay.hidden,
#gallery-overlay.hidden,
#gallery-save-overlay.hidden {
  display: none;
}

/* ── Truth Table Overlay ─────────────────────────────────── */
#truth-box {
  width: min(750px, calc(100vw - 40px));
  max-height: min(800px, calc(100vh - 60px));
  overflow: auto;
  background: linear-gradient(180deg, rgba(15,21,32,0.98) 0%, rgba(10,14,20,0.98) 100%);
  border: 1px solid var(--border-bright);
  border-radius: 10px;
  padding: 28px;
  box-shadow:
    0 0 60px rgba(0, 0, 0, 0.6),
    0 0 24px rgba(0, 212, 255, 0.12);
  animation: slideUp 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}

#truth-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding-bottom: 16px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--border);
}

#truth-title {
  font-size: 24px;
  letter-spacing: 3px;
  color: var(--accent-cyan);
  font-weight: 700;

}

#truth-table-container table {
  width: 100%;
  border-collapse: collapse;
  font-family: 'JetBrains Mono', monospace;
  font-size: 18px;
  direction: ltr;
}

#truth-table-container th {
  padding: 12px 18px;
  text-align: center;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--accent-cyan);
  border-bottom: 2px solid var(--border-bright);
  font-size: 17px;
}

#truth-table-container td {
  padding: 12px 18px;
  text-align: center;
  border-bottom: 1px solid rgba(42, 64, 96, 0.3);
  font-weight: 600;
}

#truth-table-container tr:last-child td {
  border-bottom: none;
}

#truth-table-container .tt-input {
  color: var(--text-primary);
}

#truth-table-container .tt-output {
  font-weight: 700;
}

#truth-table-container .tt-val-1 {
  color: #39ff14;
}

#truth-table-container .tt-val-0 {
  color: #c62828;
}

#truth-table-container .tt-sep {
  width: 2px;
  padding: 0;
  background: var(--border-bright);
}

#truth-table-container th.tt-sep {
  border-bottom-color: var(--border-bright);
}

/* ── Solution (inside win overlay) ────────────────────────── */
#solution-diagrams {
  display: flex;
  gap: 28px;
  justify-content: center;
  flex-wrap: wrap;
  width: 100%;
}

.solution-diagram {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  flex: 1;
  min-width: 280px;
}

.solution-diagram-label {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--text-dim);

  text-align: center;
}

.solution-diagram svg {
  background: rgba(5, 10, 18, 0.7);
  border: 1px solid rgba(42, 64, 96, 0.4);
  border-radius: 8px;
  max-width: 100%;
  height: auto;
}

#solution-explanation {
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-primary);

  text-align: center;
  max-width: 900px;
  padding: 0 10px;
}

#solution-gates {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);

  text-align: center;
  padding: 12px 20px;
  background: rgba(0, 212, 255, 0.06);
  border: 1px solid rgba(0, 212, 255, 0.2);
  border-radius: 6px;
  letter-spacing: 1px;
}

#solution-gates span {
  color: var(--accent-cyan);
}


#truth-table-container .truth-objective {
  margin: 16px 2px 0;
  padding-top: 14px;
  border-top: 1px solid rgba(42, 64, 96, 0.45);
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.5;

  text-align: left;
}

#win-box,
#final-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 36px 44px;
  background: var(--bg-panel);
  border: 1px solid var(--border-bright);
  border-radius: 6px;
  box-shadow:
    0 0 60px rgba(57, 255, 20, 0.12),
    0 0 120px rgba(57, 255, 20, 0.05),
    inset 0 1px 0 rgba(255,255,255,0.04);
  animation: slideUp 0.35s cubic-bezier(0.22, 1, 0.36, 1);
  max-width: calc(100vw - 24px);
  max-height: calc(100vh - 24px);
  overflow: auto;
}

#win-stats {
  display: flex;
  gap: 16px;
  align-items: center;
}

.btn-share {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1.5px;
  padding: 8px 18px;
  border: 2px solid #39ff14;
  border-radius: 6px;
  background: rgba(57, 255, 20, 0.1);
  color: #39ff14;
  cursor: pointer;
  transition: background 0.2s, box-shadow 0.2s;
}

.btn-share:hover {
  background: rgba(57, 255, 20, 0.25);
  box-shadow: 0 0 15px rgba(57, 255, 20, 0.3);
}

#win-buttons {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
}

#win-solution.hidden { display: none; }

#win-solution {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  width: 100%;
  padding-top: 16px;
  margin-top: 4px;
  border-top: 1px solid var(--border);
}

#info-box {
  width: min(1500px, calc(100vw - 40px));
  max-height: min(820px, calc(100vh - 100px));
  overflow: auto;
  background: var(--bg-panel);
  border: 1px solid var(--border-bright);
  border-radius: 8px;
  box-shadow:
    0 0 50px rgba(0, 0, 0, 0.55),
    0 0 24px rgba(0, 212, 255, 0.12);
  padding: 20px;
  animation: slideUp 0.25s cubic-bezier(0.22, 1, 0.36, 1);
}

#diagram-overlay {
  z-index: 240;
  background: rgba(0, 0, 0, 0.5);
}

#diagram-box {
  width: min(960px, calc(100vw - 24px));
  max-height: min(760px, calc(100vh - 24px));
  overflow: auto;
  background: linear-gradient(180deg, rgba(15,21,32,0.99) 0%, rgba(10,14,20,0.98) 100%);
  border: 1px solid var(--border-bright);
  border-radius: 10px;
  padding: 22px;
  box-shadow:
    0 0 60px rgba(0, 0, 0, 0.6),
    0 0 24px rgba(0, 212, 255, 0.1);
  animation: slideUp 0.25s cubic-bezier(0.22, 1, 0.36, 1);
}

#diagram-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
  padding-bottom: 12px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--border);
}

#diagram-title {
  font-size: 22px;
  letter-spacing: 4px;
  color: var(--accent-cyan);
  font-weight: 700;
}

#diagram-subtitle {
  margin-top: 4px;
  font-size: 12px;
  letter-spacing: 2px;
  color: var(--text-dim);
  text-transform: uppercase;
}

#diagram-content {
  display: grid;
  place-items: center;
}

#diagram-content svg {
  width: 100%;
  height: auto;
  display: block;
}

/* FF info popup truth table */
.ff-popup-truth {
  width: 100%;
  margin-bottom: 16px;
  text-align: center;
}
.ff-popup-truth h4 {
  color: #c080ff;
  font-size: 16px;
  margin: 0 0 6px;
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: 1px;
}
.ff-popup-desc {
  color: #8ab4cc;
  font-size: 13px;
  margin: 0 0 12px;
  line-height: 1.5;

}
.ff-popup-table {
  margin: 0 auto 8px;
  border-collapse: collapse;
  font-family: 'JetBrains Mono', monospace;
  font-size: 14px;
}
.ff-popup-table th {
  background: rgba(0, 212, 255, 0.12);
  color: #00d4ff;
  padding: 6px 14px;
  border: 1px solid #1a3060;
  font-weight: bold;
}
.ff-popup-table td {
  padding: 5px 14px;
  border: 1px solid #1a3060;
  color: #c8d8f0;
  text-align: center;
}
.ff-popup-structure-label {
  color: #c080ff;
  font-size: 14px;
  font-family: 'JetBrains Mono', monospace;
  margin: 12px 0 8px;
  text-align: center;

  letter-spacing: 0.5px;
}

#menu-box {
  width: min(1100px, calc(100vw - 32px));
  max-height: min(820px, calc(100vh - 80px));
  overflow: auto;
  background: linear-gradient(180deg, rgba(15,21,32,0.98) 0%, rgba(10,14,20,0.98) 100%);
  border: 1px solid var(--border-bright);
  border-radius: 10px;
  padding: 22px;
  box-shadow:
    0 0 60px rgba(0, 0, 0, 0.6),
    0 0 24px rgba(0, 212, 255, 0.08);
  animation: slideUp 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}

#hint-box {
  width: min(980px, calc(100vw - 24px));
  max-height: min(860px, calc(100vh - 24px));
  background: linear-gradient(180deg, rgba(15,21,32,0.98) 0%, rgba(10,14,20,0.98) 100%);
  border: 1px solid var(--border-bright);
  border-radius: 10px;
  padding: 28px;
  box-shadow:
    0 0 60px rgba(0, 0, 0, 0.6),
    0 0 24px rgba(255, 215, 0, 0.12);
  animation: slideUp 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}

#hint-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  padding-bottom: 16px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--border);
}

#hint-title {
  font-size: 24px;
  letter-spacing: 5px;
  color: var(--gold);
  font-weight: 700;
}

#hint-level {
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: 2px;
  color: var(--text-dim);
  text-transform: uppercase;
}

#hint-body {
  font-size: 16px;
  line-height: 1.9;
  letter-spacing: 1.2px;
  color: var(--text-primary);

  text-align: left;
}

#hint-body strong {
  color: #fff;
}

#menu-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 14px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

#menu-title {
  font-size: 18px;
  letter-spacing: 4px;
  color: var(--accent-cyan);
  font-weight: 700;
}

#menu-subtitle {
  margin-top: 6px;
  font-size: 10px;
  line-height: 1.6;
  letter-spacing: 2px;
  color: var(--text-dim);
  max-width: 720px;
}

#difficulty-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 6px;
}

#tab-description {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  font-weight: 600;
  color: #00d4ff;
  min-height: 22px;
  margin-bottom: 10px;
  padding: 4px 8px;
  border-left: 3px solid #00d4ff;
  transition: opacity 0.25s;
}

.difficulty-tab {
  font-size: 10px;
  letter-spacing: 2px;
  text-transform: uppercase;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--border-bright);
  background: rgba(30, 144, 255, 0.06);
  color: var(--text-dim);
  cursor: pointer;
  transition: all 0.16s ease;
}

.difficulty-tab:hover {
  border-color: var(--accent-cyan);
  color: #fff;
  box-shadow: 0 0 10px rgba(0, 212, 255, 0.12);
}

.difficulty-tab.active {
  border-color: var(--accent-cyan);
  background: rgba(0, 212, 255, 0.15);
  color: #fff;
  box-shadow: 0 0 12px rgba(0, 212, 255, 0.22);
}

.difficulty-tab.completed {
  border-color: #39ff14;
}
.difficulty-tab.completed.active {
  background: rgba(57, 255, 20, 0.12);
  box-shadow: 0 0 12px rgba(57, 255, 20, 0.2);
}

.difficulty-tab {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.tab-label {
  white-space: nowrap;
}

.tab-progress {
  width: 100%;
  height: 3px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 2px;
  overflow: hidden;
}

.tab-progress-fill {
  height: 100%;
  border-radius: 2px;
  transition: width 0.4s ease;
}
.tab-progress-fill.empty {
  background: #333;
}
.tab-progress-fill.low {
  background: #e67e22;
}
.tab-progress-fill.mid {
  background: #00d4ff;
}
.tab-progress-fill.full {
  background: #39ff14;
  box-shadow: 0 0 6px rgba(57, 255, 20, 0.4);
}

.difficulty-empty {
  grid-column: 1 / -1;
  padding: 28px 18px;
  border: 1px dashed var(--border-bright);
  border-radius: 8px;
  text-align: center;
  color: var(--text-dim);
  letter-spacing: 2px;
  text-transform: uppercase;
  font-size: 10px;
}

#level-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
}

.level-card {
  text-align: left;
  padding: 16px;
  border-radius: 8px;
  border: 1px solid var(--border-bright);
  background: rgba(19, 26, 38, 0.9);
  color: var(--text-primary);
  cursor: pointer;
  min-height: 112px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  justify-content: space-between;
  text-transform: none;
  letter-spacing: normal;
  transition: all 0.2s ease;
}

.level-card:hover {
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.14);
  transform: translateY(-1px);
}

.level-card.completed {
  border-color: rgba(57, 255, 20, 0.8);
  background: rgba(10, 36, 16, 0.92);
  box-shadow: 0 0 18px rgba(57, 255, 20, 0.12);
}

.level-card.locked {
  border-color: var(--border);
  background: rgba(12, 16, 24, 0.9);
}

.level-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.level-card-name {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 2px;
}

.level-card-title {
  font-size: 19px;
  font-weight: 800;
  letter-spacing: 2.5px;
  color: var(--text-primary);
  text-transform: uppercase;
  line-height: 1.2;
}

.level-card-status {
  font-size: 9px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-dim);
}

.level-card.completed .level-card-name,
.level-card.completed .level-card-status {
  color: #39ff14;
}

.level-card.completed .level-card-title {
  color: #39ff14;
  text-shadow: 0 0 10px rgba(57, 255, 20, 0.25);
}

.level-card-description {
  font-size: 10px;
  line-height: 1.6;
  letter-spacing: 1px;
  color: var(--text-dim);
}

.level-card-best {
  font-size: 10px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: rgba(57, 255, 20, 0.9);
}

.level-card-meta,
.level-card-best {
  opacity: 0.95;
}

.level-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  font-size: 9px;
  letter-spacing: 2px;
  color: var(--text-muted);
  text-transform: uppercase;
}

.level-card.completed .level-card-meta {
  color: rgba(57, 255, 20, 0.85);
}

#info-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

#info-title {
  font-size: 16px;
  letter-spacing: 3px;
  color: var(--accent-cyan);
  font-weight: 700;
}

#truth-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 14px;
}

/* Flip-Flop Section - Separate Row */
#ff-section {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 14px;
  margin-top: 20px;
  padding-top: 20px;
  border-top: 2px solid var(--border-bright);
}

.ff-section-title {
  grid-column: 1 / -1;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 3px;
  color: #a060ff;
  text-transform: uppercase;
  margin-bottom: 6px;
}

.truth-card {
  background: var(--bg-panel-alt);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px;
}

.gate-symbol-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 8px 4px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 8px;
}

.gate-svg {
  width: 86px;
  height: 48px;
  flex-shrink: 0;
}

.gate-formula {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 1px;
  white-space: nowrap;
}

.truth-card h3 {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  font-size: 13px;
  letter-spacing: 2px;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.truth-card h3 .component-title {
  flex: 1 1 auto;
  min-width: 0;
}

.ff-type-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 34px;
  height: 20px;
  padding: 0 6px;
  border-radius: 999px;
  border: 1px solid var(--border-bright);
  background: rgba(160, 96, 255, 0.12);
  color: #caa0ff;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1px;
  flex: 0 0 auto;
}

.ff-type-d {
  border-color: rgba(0, 212, 255, 0.5);
  background: rgba(0, 212, 255, 0.12);
  color: #7fe7ff;
}

.ff-type-t {
  border-color: rgba(57, 255, 20, 0.45);
  background: rgba(57, 255, 20, 0.1);
  color: #97ff82;
}

.ff-type-sr {
  border-color: rgba(255, 215, 0, 0.5);
  background: rgba(255, 215, 0, 0.1);
  color: #ffe38a;
}

.ff-type-jk {
  border-color: rgba(160, 96, 255, 0.55);
  background: rgba(160, 96, 255, 0.14);
  color: #d4b6ff;
}

.component-title {
  min-width: 0;
}

.component-info-btn {
  width: 20px;
  height: 20px;
  min-width: 20px;
  padding: 0;
  border-radius: 999px;
  border: 1px solid rgba(0, 212, 255, 0.75);
  background: rgba(0, 212, 255, 0.12);
  color: var(--accent-cyan);
  font-size: 12px;
  line-height: 1;
  letter-spacing: 0;
  font-weight: 700;
  text-transform: none;
  flex: 0 0 auto;
}

.component-info-btn:hover {
  background: rgba(0, 212, 255, 0.24);
  box-shadow: 0 0 10px rgba(0, 212, 255, 0.25);
}

.component-info-btn:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 2px;
}

.truth-card table {
  width: 100%;
  border-collapse: collapse;
  font-size: 11px;
  color: var(--text-primary);
}

.truth-card th,
.truth-card td {
  border: 1px solid var(--border);
  padding: 4px 6px;
  text-align: center;
}

.truth-card th {
  color: var(--accent-cyan);
  font-weight: 700;
  background: rgba(0, 212, 255, 0.08);
}

.truth-card td {
  color: var(--text-primary);
}

.truth-card td.bit-1 {
  color: #39ff14;
  font-weight: 700;
  text-shadow: 0 0 8px rgba(57, 255, 20, 0.35);
}

.truth-card td.bit-0 {
  color: #ff4b4b;
  font-weight: 700;
  text-shadow: 0 0 8px rgba(255, 75, 75, 0.28);
}

.truth-card tbody tr:nth-child(even) td {
  background: transparent;
}

/* Sequential/Flip-Flop Cards */
.ff-info-card {
  border-left: 3px solid #a060ff;
  background: rgba(160, 96, 255, 0.05);
}

.ff-info-card h3 {
  color: #c080ff;
  letter-spacing: 2px;
}

.ff-desc {
  font-size: 12px;
  color: var(--text-dim);
  margin: 8px 0;
  font-style: italic;
  line-height: 1.5;
}

#win-icon,
#final-icon {
  font-size: 28px;
  line-height: 1;
  filter: drop-shadow(0 0 16px var(--neon-green));
  color: var(--neon-green);
}

#final-icon {
  color: var(--gold);
  filter: drop-shadow(0 0 16px var(--gold));
}

#win-title,
#final-title {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 6px;
  color: var(--neon-green);
  text-shadow: 0 0 20px rgba(57, 255, 20, 0.6);
}

#final-title {
  color: var(--gold);
  text-shadow: 0 0 20px rgba(255, 215, 0, 0.6);
}

#win-level {
  font-size: 12px;
  letter-spacing: 3px;
  color: var(--text-dim);
}

#win-time,
#win-best {
  font-size: 13px;
  letter-spacing: 1.5px;
  font-weight: 700;
  color: var(--text-primary);
}

#win-time {
  color: var(--accent-cyan);
}

#win-best {
  color: rgba(57, 255, 20, 0.9);
}

#final-sub {
  font-size: 12px;
  letter-spacing: 2px;
  color: var(--text-dim);
}

/* Buttons */
button {
  font-family: var(--font);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 3px;
  padding: 12px 32px;
  border: 1px solid var(--accent-cyan);
  border-radius: 4px;
  background: rgba(0, 212, 255, 0.1);
  color: var(--accent-cyan);
  cursor: pointer;
  transition: all 0.2s ease;
  outline: none;
  text-transform: uppercase;
}

button:hover {
  background: rgba(0, 212, 255, 0.2);
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.3);
  color: #fff;
}

button:active {
  transform: scale(0.97);
}

.btn-secondary {
  font-size: 10px;
  padding: 8px 24px;
  border-color: var(--border-bright);
  background: transparent;
  color: var(--text-dim);
}

.btn-secondary:hover {
  background: rgba(255,255,255,0.05);
  color: var(--text-primary);
  box-shadow: none;
  border-color: var(--text-dim);
}

#btn-truth {
  border-color: rgba(0, 212, 255, 0.4);
  background: rgba(0, 212, 255, 0.08);
  color: var(--accent-cyan);

  font-size: 10px;
}

#btn-truth:hover {
  background: rgba(0, 212, 255, 0.18);
  border-color: var(--accent-cyan);
  box-shadow: 0 0 12px rgba(0, 212, 255, 0.2);
}

#btn-truth.hidden {
  display: none;
}

#btn-play-again {
  border-color: var(--gold);
  background: rgba(255, 215, 0, 0.08);
  color: var(--gold);
}

#btn-play-again:hover {
  background: rgba(255, 215, 0, 0.18);
  box-shadow: 0 0 20px rgba(255,215,0,0.25);
  color: #fff;
}

/* ── Tooltip ─────────────────────────────────────────────── */

#tooltip {
  position: fixed;
  z-index: 300;
  padding: 6px 10px;
  background: var(--bg-panel-alt);
  border: 1px solid var(--border-bright);
  border-radius: 3px;
  font-size: 10px;
  letter-spacing: 1px;
  color: var(--accent-cyan);
  pointer-events: none;
  white-space: nowrap;
}

#tooltip.hidden {
  display: none;
}

/* ── Clock Controls ─────────────────────────────────────── */

#clock-controls {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  margin-top: 4px;
  padding: 8px 14px;
  border: 1px solid rgba(0, 212, 255, 0.25);
  border-radius: 6px;
  background: rgba(0, 40, 60, 0.35);
  animation: fadeIn 0.3s ease;
}

#clock-controls.hidden {
  display: none;
}

#clock-controls-label {
  font-size: 8px;
  letter-spacing: 3px;
  color: var(--accent-cyan);
  opacity: 0.7;
  text-transform: uppercase;
}

#clock-controls-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

#btn-step {
  font-family: var(--font);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 2px;
  padding: 7px 16px;
  border: 1px solid var(--accent-cyan);
  border-radius: 4px;
  background: rgba(0, 212, 255, 0.15);
  color: var(--accent-cyan);
  cursor: pointer;
  transition: all 0.15s ease;
}

#btn-step:hover {
  background: rgba(0, 212, 255, 0.28);
  box-shadow: 0 0 14px rgba(0, 212, 255, 0.35);
  color: #fff;
}

#btn-step:active {
  transform: scale(0.94);
  background: rgba(0, 212, 255, 0.4);
}

#btn-auto-clk {
  font-size: 9px;
  padding: 5px 10px;
}

#btn-auto-clk.running {
  border-color: #39ff14;
  color: #39ff14;
  background: rgba(57, 255, 20, 0.1);
  box-shadow: 0 0 10px rgba(57, 255, 20, 0.25);
  animation: pulse 1s ease infinite;
}

#step-count {
  font-family: var(--font);
  font-size: 10px;
  letter-spacing: 2px;
  color: var(--accent-cyan);
  min-width: 60px;
  text-align: left;
  opacity: 0.8;
}

/* ── Animations ──────────────────────────────────────────── */

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(24px) scale(0.97); }
  to   { opacity: 1; transform: translateY(0)    scale(1);    }
}

@keyframes pulse {
  0%, 100% { opacity: 1;   transform: scale(1);    }
  50%       { opacity: 0.7; transform: scale(1.05); }
}

@media (max-width: 900px) {
  #level-grid {
    grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  }

  #truth-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  #ff-section {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  #hud {
    min-height: 56px;
    padding: 4px 10px;
  }

  #hud-title {
    font-size: 15px;
    letter-spacing: 3px;
  }

  #hud-subtitle {
    letter-spacing: 2px;
  }

  #gate-palette {
    gap: 3px;
  }

  .gate-chip {
    padding: 2px 5px;
    font-size: 8px;
  }

  #hud-left,
  #hud-right {
    min-width: 200px;
  }

  #hud-left {
    margin-left: 6px;
  }

  #hud-right {
    margin-right: 2px;
  }

  #level-status-row {
    gap: 8px;
  }

  #hud-actions {
    gap: 6px;
  }

  #btn-levels,
  #btn-hint {
    font-size: 9px;
    padding: 6px 14px;
  }

  #level-time,
  #level-best {
    font-size: 10px;
    padding: 3px 8px;
  }
}

@media (max-width: 640px) {
  #menu-box {
    width: calc(100vw - 16px);
    max-height: calc(100vh - 24px);
    padding: 14px;
  }

  #menu-header {
    flex-direction: column;
    align-items: stretch;
  }

  #menu-title {
    font-size: 14px;
    letter-spacing: 2px;
  }

  #menu-subtitle {
    font-size: 9px;
  }

  #level-grid {
    grid-template-columns: 1fr;
  }

  #truth-grid {
    grid-template-columns: 1fr;
  }

  #ff-section {
    grid-template-columns: 1fr;
  }

  #info-box {
    width: calc(100vw - 16px);
    max-height: calc(100vh - 84px);
    padding: 14px;
  }

  #diagram-box {
    width: calc(100vw - 16px);
    max-height: calc(100vh - 16px);
    padding: 14px;
  }

  #hint-box {
    width: calc(100vw - 16px);
    max-height: calc(100vh - 16px);
    padding: 18px;
  }

  #hint-title {
    font-size: 18px;
    letter-spacing: 3px;
  }

  #hint-body {
    font-size: 14px;
    line-height: 1.8;
  }

  #info-title {
    font-size: 13px;
    letter-spacing: 2px;
  }

  #level-status-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  #level-name {
    line-height: 1.25;
  }

  #hud-actions {
    gap: 5px;
  }

  #level-time,
  #level-best {
    font-size: 9px;
  }
}

/* ── Gallery Overlay ──────────────────────────────────────── */
#gallery-box {
  width: min(900px, calc(100vw - 32px));
  max-height: min(700px, calc(100vh - 80px));
  overflow: auto;
  background: var(--bg-panel);
  border: 1px solid var(--border-bright);
  border-radius: 12px;
  padding: 24px;
}

#gallery-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

#gallery-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 2px;
}

#gallery-search-row {
  margin-bottom: 14px;
}
#gallery-search {
  width: 100%;
  font-family: inherit;
  font-size: 13px;
  padding: 10px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text-primary);
  outline: none;
}
#gallery-search:focus {
  border-color: var(--accent);
}

#gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}

#gallery-empty {
  text-align: center;
  color: var(--text-dim);
  padding: 48px 16px;
  font-size: 13px;
}

.gallery-card {
  background: var(--bg-panel-alt);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px;
  cursor: default;
  transition: border-color 0.2s;
}
.gallery-card:hover {
  border-color: var(--accent);
}

.gallery-card-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
  word-break: break-word;
}

.gallery-card-desc {
  font-size: 11px;
  color: var(--text-dim);
  margin-bottom: 8px;
  word-break: break-word;
  white-space: pre-wrap;
  max-height: 48px;
  overflow: hidden;
}

.gallery-card-meta {
  font-size: 10px;
  color: var(--text-dim);
  margin-bottom: 10px;
  opacity: 0.7;
}

.gallery-card-actions {
  display: flex;
  gap: 6px;
}

.gallery-card-actions button {
  font-family: inherit;
  font-size: 10px;
  padding: 4px 10px;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: var(--bg-panel);
  color: var(--text-primary);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}
.gallery-card-actions button:hover {
  background: var(--border);
  border-color: var(--border-bright);
}
.gallery-card-actions .gallery-btn-delete {
  color: #ff4444;
  border-color: #441111;
}
.gallery-card-actions .gallery-btn-delete:hover {
  background: #331111;
  border-color: #ff4444;
}
.gallery-card-actions .gallery-btn-like {
  color: var(--text-dim);
  border-color: var(--border);
}
.gallery-card-actions .gallery-btn-like:hover,
.gallery-card-actions .gallery-btn-like.liked {
  color: #ff4081;
  border-color: #662040;
  background: rgba(255, 64, 129, 0.1);
}
.gallery-card-actions .gallery-btn-save-copy {
  color: #00d4ff;
  border-color: #0a3a50;
}
.gallery-card-actions .gallery-btn-save-copy:hover {
  background: rgba(0, 212, 255, 0.1);
  border-color: #00d4ff;
}
.gallery-card-actions .gallery-btn-edit {
  color: #ffaa00;
  border-color: #4a3000;
}
.gallery-card-actions .gallery-btn-edit:hover {
  background: rgba(255, 170, 0, 0.1);
  border-color: #ffaa00;
}

/* ── Gallery Save Dialog ──────────────────────────────────── */
#gallery-save-box {
  width: min(420px, calc(100vw - 32px));
  background: var(--bg-panel);
  border: 1px solid var(--border-bright);
  border-radius: 12px;
  padding: 24px;
}

#gallery-save-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 2px;
  margin-bottom: 16px;
}

.gallery-save-row {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 12px;
}
.gallery-save-row span {
  font-size: 11px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 1px;
}
.gallery-save-row input,
.gallery-save-row textarea {
  font-family: inherit;
  font-size: 13px;
  padding: 8px 10px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text-primary);
  outline: none;
  resize: vertical;
}
.gallery-save-row input:focus,
.gallery-save-row textarea:focus {
  border-color: var(--accent);
}

#gallery-save-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 16px;
}

/* ── Menu-embedded Gallery (inside STAGES) ──────────────── */
.menu-gallery-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 18px;
  grid-column: 1 / -1;
}
.menu-gallery-tab {
  font-family: inherit;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  padding: 10px 24px;
  border-radius: 8px;
  border: 2px solid var(--border);
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
  transition: all 0.2s;
}
.menu-gallery-tab:hover {
  color: var(--text-primary);
  border-color: #a060ff;
  background: rgba(160, 96, 255, 0.08);
}
.menu-gallery-tab.active {
  background: linear-gradient(135deg, rgba(160, 96, 255, 0.25), rgba(0, 212, 255, 0.15));
  border-color: #a060ff;
  color: #fff;
  box-shadow: 0 0 16px rgba(160, 96, 255, 0.3), inset 0 0 8px rgba(160, 96, 255, 0.1);
}

.menu-gallery-search-row {
  margin-bottom: 14px;
  grid-column: 1 / -1;
}
.menu-gallery-search {
  width: 100%;
  max-width: 350px;
  font-family: inherit;
  font-size: 13px;
  padding: 10px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text-primary);
  outline: none;
}
.menu-gallery-search:focus {
  border-color: var(--accent);
}

.menu-gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 14px;
  grid-column: 1 / -1;
}

/* Gallery special tab in difficulty bar */
.gallery-tab-special {
  border-color: #a060ff !important;
  color: #c090ff;
}
.gallery-tab-special:hover {
  border-color: #c090ff !important;
  color: #fff;
  box-shadow: 0 0 12px rgba(160, 96, 255, 0.25);
}
.gallery-tab-special.active {
  background: linear-gradient(135deg, rgba(160, 96, 255, 0.2), rgba(0, 212, 255, 0.1)) !important;
  border-color: #a060ff !important;
  color: #fff;
  box-shadow: 0 0 16px rgba(160, 96, 255, 0.3);
}

/* Gallery Tabs */
#gallery-tabs {
  display: flex;
  gap: 4px;
}
.gallery-tab {
  font-family: inherit;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 2px;
  padding: 10px 22px;
  border: 2px solid var(--border);
  border-radius: 8px;
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
  transition: all 0.2s;
}
.gallery-tab:hover {
  color: var(--text-primary);
  border-color: #a060ff;
  background: rgba(160, 96, 255, 0.08);
}
.gallery-tab.active {
  background: linear-gradient(135deg, rgba(160, 96, 255, 0.25), rgba(0, 212, 255, 0.15));
  border-color: #a060ff;
  color: #fff;
  box-shadow: 0 0 16px rgba(160, 96, 255, 0.3), inset 0 0 8px rgba(160, 96, 255, 0.1);
}

#gallery-loading {
  text-align: center;
  color: var(--text-dim);
  padding: 48px 16px;
  font-size: 13px;
}

.gallery-card-author {
  font-size: 11px;
  color: var(--accent);
  margin-bottom: 4px;
  opacity: 0.8;
}

.gallery-save-check {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
  cursor: pointer;
}
.gallery-save-check input[type="checkbox"] {
  accent-color: var(--accent);
  width: 16px;
  height: 16px;
}
.gallery-save-check span {
  font-size: 12px;
  color: var(--text-primary);
}

/* ── Showcase Gallery ───────────────────────────────────── */
.showcase-filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 8px 0 12px;
}
.showcase-filter-btn {
  background: rgba(160, 96, 255, 0.08);
  border: 1px solid rgba(160, 96, 255, 0.25);
  color: #c8d8f0;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  padding: 4px 10px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.15s;
}
.showcase-filter-btn:hover {
  background: rgba(160, 96, 255, 0.18);
  border-color: #a060ff;
}
.showcase-filter-btn.active {
  background: rgba(160, 96, 255, 0.3);
  border-color: #a060ff;
  color: #a060ff;
  font-weight: bold;
}
.gallery-card-category {
  font-size: 10px;
  color: #a060ff;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 4px;
  opacity: 0.8;
}