* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

:root {
  --bg-deep: #0d0d1a;
  --bg-mid: #14142b;
  --bg-card: #1e1e3a;
  --bg-card-hover: #2a2a50;
  --cyan: #00d4ff;
  --cyan-glow: rgba(0, 212, 255, 0.4);
  --magenta: #ff6b9d;
  --green: #00ff88;
  --green-dim: #00cc6a;
  --yellow: #ffd700;
  --orange: #ff8c42;
  --wire-low: #2a2a4a;
  --wire-high: #00d4ff;
  --text: #e0e0f0;
  --text-dim: #7a7a9a;
  --font: 'JetBrains Mono', monospace;
}

body {
  background: var(--bg-deep);
  font-family: var(--font);
  color: var(--text);
  overflow: hidden;
  width: 100vw;
  height: 100vh;
  position: relative;
}

#toolbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 64px;
  background: linear-gradient(180deg, #12122a 0%, #0d0d1aee 100%);
  border-bottom: 1px solid rgba(0, 212, 255, 0.15);
  display: flex;
  align-items: center;
  padding: 0 12px;
  gap: 6px;
  z-index: 100;
  backdrop-filter: blur(10px);
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
}

#toolbar::-webkit-scrollbar {
  height: 3px;
}
#toolbar::-webkit-scrollbar-track { background: transparent; }
#toolbar::-webkit-scrollbar-thumb { background: var(--cyan); border-radius: 2px; }

.toolbar-btn {
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 6px 10px;
  background: var(--bg-card);
  border: 1px solid rgba(0, 212, 255, 0.1);
  border-radius: 8px;
  cursor: grab;
  color: var(--text);
  font-family: var(--font);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.5px;
  transition: all 0.2s ease;
  min-width: 56px;
  height: 48px;
  user-select: none;
}

.toolbar-btn:hover {
  background: var(--bg-card-hover);
  border-color: var(--cyan);
  box-shadow: 0 0 12px var(--cyan-glow);
  transform: translateY(-2px);
}

.toolbar-btn:active {
  cursor: grabbing;
  transform: scale(0.95);
}

.toolbar-btn .icon {
  font-size: 16px;
  font-weight: 800;
  margin-bottom: 2px;
}

.toolbar-btn.input-btn { border-color: rgba(0, 255, 136, 0.2); }
.toolbar-btn.input-btn:hover { border-color: var(--green); box-shadow: 0 0 12px rgba(0,255,136,0.3); }
.toolbar-btn.output-btn { border-color: rgba(255, 107, 157, 0.2); }
.toolbar-btn.output-btn:hover { border-color: var(--magenta); box-shadow: 0 0 12px rgba(255,107,157,0.3); }

.toolbar-separator {
  width: 1px;
  height: 32px;
  background: rgba(0, 212, 255, 0.15);
  flex-shrink: 0;
  margin: 0 4px;
}

.toolbar-btn.action-btn {
  background: rgba(255,107,157,0.1);
  border-color: rgba(255,107,157,0.2);
  cursor: pointer;
}
.toolbar-btn.action-btn:hover {
  background: rgba(255,107,157,0.2);
  border-color: var(--magenta);
  box-shadow: 0 0 12px rgba(255,107,157,0.3);
}

.toolbar-btn.help-btn {
  background: rgba(255,215,0,0.08);
  border-color: rgba(255,215,0,0.15);
  cursor: pointer;
}
.toolbar-btn.help-btn:hover {
  background: rgba(255,215,0,0.15);
  border-color: var(--yellow);
  box-shadow: 0 0 12px rgba(255,215,0,0.3);
}

.toolbar-btn.preset-btn {
  cursor: pointer;
  background: rgba(0,212,255,0.05);
}

#canvas {
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  bottom: 32px;
  width: 100%;
  cursor: crosshair;
}

#status-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 32px;
  background: linear-gradient(0deg, #0d0d1a 0%, #12122aee 100%);
  border-top: 1px solid rgba(0, 212, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  font-size: 11px;
  color: var(--text-dim);
  z-index: 100;
}

#status-bar .status-left {
  display: flex;
  gap: 16px;
}

#status-bar .status-right a {
  color: var(--cyan);
  text-decoration: none;
  opacity: 0.6;
  transition: opacity 0.2s;
}
#status-bar .status-right a:hover { opacity: 1; }

#context-menu {
  position: fixed;
  z-index: 200;
  background: var(--bg-card);
  border: 1px solid rgba(0, 212, 255, 0.2);
  border-radius: 8px;
  padding: 4px;
  min-width: 160px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.6);
  backdrop-filter: blur(20px);
}

#context-menu.hidden { display: none; }

.ctx-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 12px;
  font-family: var(--font);
  color: var(--text);
  transition: background 0.15s;
}
.ctx-item:hover {
  background: rgba(0, 212, 255, 0.1);
}
.ctx-item .ctx-icon { width: 16px; text-align: center; }

#help-modal {
  position: fixed;
  inset: 0;
  z-index: 300;
  background: rgba(0,0,0,0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(4px);
}
#help-modal.hidden { display: none; }

.help-content {
  background: var(--bg-mid);
  border: 1px solid rgba(0, 212, 255, 0.2);
  border-radius: 16px;
  padding: 32px;
  max-width: 640px;
  max-height: 80vh;
  overflow-y: auto;
  width: 90%;
  box-shadow: 0 16px 64px rgba(0,0,0,0.5);
}

.help-content h2 {
  font-size: 20px;
  font-weight: 800;
  color: var(--cyan);
  margin-bottom: 16px;
}
.help-content h3 {
  font-size: 14px;
  font-weight: 700;
  color: var(--magenta);
  margin: 16px 0 8px;
}
.help-content p, .help-content li {
  font-size: 12px;
  line-height: 1.7;
  color: var(--text-dim);
}
.help-content ul { padding-left: 20px; }
.help-content .close-help {
  float: right;
  background: none;
  border: 1px solid rgba(255,107,157,0.3);
  color: var(--magenta);
  font-family: var(--font);
  font-size: 12px;
  padding: 6px 16px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s;
}
.help-content .close-help:hover {
  background: rgba(255,107,157,0.15);
}

.truth-table {
  border-collapse: collapse;
  font-size: 11px;
  margin: 8px 0;
}
.truth-table th, .truth-table td {
  border: 1px solid rgba(0,212,255,0.15);
  padding: 4px 10px;
  text-align: center;
}
.truth-table th {
  background: rgba(0,212,255,0.08);
  color: var(--cyan);
  font-weight: 700;
}
.truth-table td { color: var(--text-dim); }

.preset-dropdown {
  position: fixed;
  z-index: 150;
  background: var(--bg-card);
  border: 1px solid rgba(0,212,255,0.2);
  border-radius: 8px;
  padding: 4px;
  min-width: 180px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.6);
}
.preset-dropdown.hidden { display: none; }