:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #1c2128;
  --bg-panel: #131820;
  --border-color: #21262d;
  --text-primary: #c9d1d9;
  --text-secondary: #8b949e;
  --text-muted: #484f58;
  --accent-teal: #39d353;
  --accent-cyan: #58a6ff;
  --accent-orange: #d29922;
  --accent-red: #f85149;
  --accent-purple: #bc8cff;
  --accent-green: #3fb950;
  --glow-teal: rgba(57, 211, 83, 0.15);
  --glow-cyan: rgba(88, 166, 255, 0.15);
}

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

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: 'JetBrains Mono', monospace;
  overflow-x: hidden;
  min-height: 100vh;
}

#root {
  min-height: 100vh;
}

::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideIn {
  from { opacity: 0; transform: translateX(-8px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes pulseGlow {
  0%, 100% { box-shadow: 0 0 8px var(--glow-teal); }
  50% { box-shadow: 0 0 16px var(--glow-teal), 0 0 24px var(--glow-cyan); }
}

@keyframes byteFade {
  from { opacity: 0; transform: scale(0.9); }
  to { opacity: 1; transform: scale(1); }
}

.animate-fade { animation: fadeIn 0.3s ease-out; }
.animate-slide { animation: slideIn 0.3s ease-out; }
.animate-pulse-glow { animation: pulseGlow 2s ease-in-out infinite; }
.animate-byte { animation: byteFade 0.2s ease-out; }

.step-active {
  background: linear-gradient(90deg, var(--glow-teal), transparent);
}

.byte-grid-cell {
  font-size: 11px;
  padding: 2px 3px;
  border-radius: 2px;
  transition: all 0.15s ease;
  cursor: default;
  display: inline-block;
}

.byte-grid-cell:hover {
  transform: scale(1.15);
  z-index: 10;
}

.byte-highlight-green { color: var(--accent-green); background: rgba(63, 185, 80, 0.12); }
.byte-highlight-cyan { color: var(--accent-cyan); background: rgba(88, 166, 255, 0.12); }
.byte-highlight-orange { color: var(--accent-orange); background: rgba(210, 153, 34, 0.12); }
.byte-highlight-red { color: var(--accent-red); background: rgba(248, 81, 73, 0.12); }
.byte-highlight-purple { color: var(--accent-purple); background: rgba(188, 140, 255, 0.12); }

.nav-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 6px 10px;
  border-radius: 6px;
  cursor: pointer;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  transition: all 0.15s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  height: 32px;
  white-space: nowrap;
}

.nav-btn:hover {
  background: var(--border-color);
  color: var(--text-primary);
  border-color: var(--text-muted);
}

.nav-btn:active {
  transform: scale(0.95);
}

.step-badge {
  background: var(--accent-cyan);
  color: var(--bg-primary);
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 6px;
  font-size: 13px;
  min-width: 44px;
  text-align: center;
}

.panel {
  background: var(--bg-panel);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow: hidden;
}

.panel-header {
  background: var(--bg-tertiary);
  border-bottom: 1px solid var(--border-color);
  padding: 8px 14px;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
}

.formula-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 12px;
  font-size: 12px;
  line-height: 1.6;
}

.match-badge {
  background: linear-gradient(135deg, rgba(63, 185, 80, 0.2), rgba(63, 185, 80, 0.05));
  border: 1px solid rgba(63, 185, 80, 0.3);
  color: var(--accent-green);
  padding: 8px 16px;
  border-radius: 8px;
  font-weight: 700;
  font-size: 14px;
  text-align: center;
}

.nomatch-badge {
  background: linear-gradient(135deg, rgba(248, 81, 73, 0.2), rgba(248, 81, 73, 0.05));
  border: 1px solid rgba(248, 81, 73, 0.3);
  color: var(--accent-red);
  padding: 8px 16px;
  border-radius: 8px;
  font-weight: 700;
  font-size: 14px;
  text-align: center;
}

.input-field {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--accent-green);
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  padding: 6px 10px;
  border-radius: 6px;
  outline: none;
  transition: border-color 0.15s;
}

.input-field:focus {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 8px var(--glow-cyan);
}

/* Desktop 3-column layout */
@media (min-width: 1025px) {
  .main-layout {
    display: flex;
    flex-direction: row;
    min-height: 0;
  }
  .left-panel {
    width: 220px;
    min-width: 180px;
    flex-shrink: 0;
    overflow-y: auto;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
  }
  .center-panel {
    flex: 1;
    overflow-y: auto;
    min-width: 0;
    padding: 16px;
  }
  .right-panel {
    width: 280px;
    min-width: 220px;
    flex-shrink: 0;
    overflow-y: auto;
    background: var(--bg-secondary);
    border-left: 1px solid var(--border-color);
    padding: 16px;
  }
}

/* Tablet layout */
@media (min-width: 641px) and (max-width: 1024px) {
  .main-layout {
    display: flex;
    flex-direction: column;
  }
  .left-panel {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    padding: 8px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    overflow-x: auto;
  }
  .left-panel .panel-header-label { display: none; }
  .step-list-item {
    padding: 6px 10px !important;
  }
  .center-panel {
    flex: 1;
    padding: 16px;
    overflow-y: auto;
  }
  .right-panel {
    padding: 16px;
    border-top: 1px solid var(--border-color);
    background: var(--bg-secondary);
  }
}

/* Mobile layout */
@media (max-width: 640px) {
  .main-layout {
    display: flex;
    flex-direction: column;
  }
  .left-panel {
    display: flex;
    flex-wrap: nowrap;
    gap: 4px;
    padding: 8px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  .left-panel .panel-header-label { display: none; }
  .left-panel .howto-section { display: none; }
  .step-list-item {
    flex-shrink: 0;
    padding: 6px 10px !important;
    border-left: none !important;
    border-radius: 6px;
  }
  .step-number-badge {
    width: 22px !important;
    height: 22px !important;
  }
  .center-panel {
    flex: 1;
    padding: 12px;
    overflow-y: auto;
  }
  .right-panel {
    padding: 12px;
    border-top: 1px solid var(--border-color);
    background: var(--bg-secondary);
  }
  .header-bar {
    flex-wrap: wrap;
    gap: 6px;
    padding: 8px !important;
  }
  .header-title {
    width: 100%;
    margin-bottom: 2px;
  }
  .header-input {
    width: 100% !important;
    max-width: none !important;
  }
  .nav-controls {
    width: 100%;
    justify-content: center;
    flex-wrap: wrap;
  }
  .nav-btn {
    min-width: 38px;
    height: 36px;
    font-size: 14px;
    padding: 6px 8px;
  }
  .seed-bar {
    flex-wrap: wrap;
    gap: 4px;
  }
  .seed-input {
    width: 100% !important;
    max-width: none !important;
    font-size: 10px !important;
  }
  .byte-grid-cell {
    font-size: 10px;
    padding: 1px 2px;
  }
}