/* Regex input */
    .regex-input-group {
      display: flex;
      flex-direction: column;
      gap: 0.6rem;
    }

    .input-wrapper {
      position: relative;
    }

    #regex-input {
      width: 100%;
      background: var(--surface-highest);
      border: none;
      border-bottom: 2px solid var(--outline-variant);
      border-radius: var(--radius-md) var(--radius-md) 0 0;
      color: var(--on-surface);
      font-family: 'JetBrains Mono', monospace;
      font-size: 1.05rem;
      font-weight: 500;
      padding: 0.7rem 0.8rem;
      padding-right: 2.2rem;
      outline: none;
      transition: border-color var(--dur-fast) var(--ease-socialite);
      letter-spacing: 0.04em;
      min-height: 2.5rem;
      white-space: nowrap;
      overflow-x: auto;
    }

    #regex-input:empty:before {
      content: attr(data-placeholder);
      color: var(--outline);
      opacity: 0.6;
    }

    #regex-input sup {
      font-size: 0.7em;
      vertical-align: super;
      line-height: 0;
    }

    #regex-input:focus {
      border-bottom-color: var(--primary);
      background: var(--surface-lowest);
    }

    #regex-input.valid {
      border-bottom-color: var(--secondary);
    }

    #regex-input.error {
      border-bottom-color: var(--tertiary);
    }

    .input-status-icon {
      position: absolute;
      right: 0.7rem;
      top: 50%;
      transform: translateY(-50%);
      font-size: 1rem;
      pointer-events: none;
    }

    .validation-msg {
      font-size: 0.72rem;
      min-height: 0.9rem;
      padding: 0 0.2rem;
      transition: all var(--dur-fast);
    }

    .validation-msg.error {
      color: var(--tertiary);
    }

    .validation-msg.valid {
      color: var(--secondary);
      font-weight: 600;
    }

    /* Regex highlight bar */
    #regex-highlight-bar {
      display: none;
      flex-wrap: wrap;
      gap: 1px;
      padding: 0.5rem 0.7rem;
      background: var(--surface-highest);
      border-radius: var(--radius-md);
      font-family: 'JetBrains Mono', monospace;
      font-size: 0.88rem;
      letter-spacing: 0.06em;
    }

    #regex-highlight-bar.visible {
      display: flex;
    }

    .rh-char {
      display: inline;
      transition: all var(--dur-normal);
      border-radius: 3px;
      padding: 1px 1.5px;
    }

    .rh-char.dim {
      opacity: 0.2;
    }

    .rh-char.active {
      background: rgba(0, 91, 191, 0.15);
      color: var(--primary);
      font-weight: 700;
    }

    /* Generate button */
    .btn-generate {
      width: 100%;
      padding: 0.7rem 1rem;
      background: linear-gradient(135deg, var(--primary), var(--primary-container));
      color: var(--on-primary);
      border: none;
      border-radius: var(--radius-lg);
      font-family: 'Inter', sans-serif;
      font-size: 0.83rem;
      font-weight: 700;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      transition: all var(--dur-normal) var(--ease-socialite);
      box-shadow: var(--lift-shadow);
      letter-spacing: 0.02em;
    }

    .btn-generate:hover {
      transform: translateY(-1px);
      box-shadow: var(--ambient-shadow);
    }

    .btn-generate:active {
      transform: translateY(0);
    }

    /* Playback panel */
    .playback-panel {
      background: var(--surface-lowest);
      border-radius: var(--radius-xl);
      padding: 0.85rem 1rem;
      box-shadow: var(--ambient-shadow);
      display: flex;
      flex-direction: column;
      gap: 0.7rem;
    }

    .playback-row {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 0.35rem;
    }

    .pb-btn {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      border: none;
      background: var(--surface-low);
      color: var(--on-surface-variant);
      font-size: 0.9rem;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: all var(--dur-fast) var(--ease-socialite);
      flex-shrink: 0;
    }

    .pb-btn:hover {
      background: var(--surface-highest);
      color: var(--primary);
    }

    .pb-btn:disabled {
      opacity: 0.35;
      pointer-events: none;
    }

    .pb-btn.primary {
      width: 44px;
      height: 44px;
      background: var(--secondary);
      color: var(--on-secondary);
      font-size: 1.1rem;
      box-shadow: 0 4px 12px rgba(0, 110, 28, 0.25);
    }

    .pb-btn.primary:hover {
      background: #005015;
      box-shadow: 0 6px 18px rgba(0, 110, 28, 0.35);
      transform: translateY(-1px);
    }

    .pb-btn.primary.playing {
      background: var(--tertiary);
      box-shadow: 0 4px 12px rgba(187, 22, 19, 0.25);
    }

    .speed-section {
      display: flex;
      flex-direction: column;
      gap: 0.3rem;
    }

    .speed-label-row {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .speed-label {
      font-size: 0.67rem;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.08em;
      color: var(--outline);
    }

    .speed-value {
      font-family: 'JetBrains Mono', monospace;
      font-size: 0.75rem;
      font-weight: 600;
      color: var(--primary);
    }

    .speed-chips {
      display: flex;
      gap: 0.25rem;
    }

    .speed-chip {
      flex: 1;
      padding: 0.3rem 0;
      background: var(--surface-highest);
      border: none;
      border-radius: var(--radius-sm);
      font-family: 'Inter', sans-serif;
      font-size: 0.68rem;
      font-weight: 600;
      color: var(--outline);
      cursor: pointer;
      transition: all var(--dur-fast);
    }

    .speed-chip.active {
      background: rgba(0, 91, 191, 0.12);
      color: var(--primary);
    }

    .step-counter {
      text-align: center;
      font-family: 'JetBrains Mono', monospace;
      font-size: 0.72rem;
      color: var(--outline);
      padding-top: 0.2rem;
    }

    .step-counter span {
      color: var(--primary);
      font-weight: 600;
    }

    .toggle-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0.5rem 0;
    }

    .toggle-label {
      font-size: 0.78rem;
      color: var(--on-surface-variant);
      font-weight: 500;
    }

    .toggle-switch {
      width: 38px;
      height: 20px;
      background: var(--outline-variant);
      border-radius: var(--radius-full);
      position: relative;
      cursor: pointer;
      transition: background var(--dur-normal) var(--ease-socialite);
      flex-shrink: 0;
    }

    .toggle-switch::after {
      content: '';
      position: absolute;
      width: 16px;
      height: 16px;
      background: white;
      border-radius: 50%;
      top: 2px;
      left: 2px;
      transition: left var(--dur-normal) var(--ease-socialite);
      box-shadow: 0 1px 4px rgba(0, 0, 0, 0.15);
    }

    .toggle-switch.on {
      background: var(--primary);
    }

    .toggle-switch.on::after {
      left: 20px;
    }



    /* Parsed analysis card */
    .parsed-card {
      background: var(--surface-lowest);
      border-radius: var(--radius-lg);
      padding: 0.8rem;
      box-shadow: var(--lift-shadow);
    }

    .parsed-row {
      display: flex;
      justify-content: space-between;
      align-items: baseline;
      font-size: 0.73rem;
      padding: 0.15rem 0;
    }

    .parsed-key {
      color: var(--outline);
      font-weight: 500;
    }

    .parsed-val {
      color: var(--on-surface);
      font-weight: 600;
      font-family: 'JetBrains Mono', monospace;
      font-size: 0.7rem;
    }

    .postfix-chip {
      margin-top: 0.5rem;
      padding: 0.45rem 0.6rem;
      background: rgba(0, 91, 191, 0.07);
      border-radius: var(--radius-md);
      display: flex;
      align-items: center;
      gap: 0.4rem;
    }

    .chip-label {
      font-size: 0.62rem;
      font-weight: 700;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      color: var(--primary);
      white-space: nowrap;
    }

    .chip-val {
      font-family: 'JetBrains Mono', monospace;
      font-size: 0.78rem;
      color: var(--on-surface);
      font-weight: 600;
    }

    .human-chip {
      margin-top: 0.4rem;
      padding: 0.45rem 0.6rem;
      background: rgba(0, 110, 28, 0.06);
      border-radius: var(--radius-md);
      font-size: 0.72rem;
      color: var(--on-surface-variant);
      line-height: 1.5;
      font-style: italic;
    }

    /* Pipeline nav */
    .pipeline-nav {
      display: flex;
      flex-direction: column;
      gap: 0.2rem;
    }

    .nav-item {
      display: flex;
      align-items: center;
      gap: 0.7rem;
      padding: 0.6rem 0.8rem;
      border-radius: var(--radius-lg);
      cursor: pointer;
      transition: all var(--dur-fast) var(--ease-socialite);
      color: var(--on-surface-variant);
      font-size: 0.82rem;
      font-weight: 500;
      user-select: none;
    }

    .nav-item:hover {
      background: var(--surface-highest);
      color: var(--on-surface);
    }

    .nav-item.active {
      background: var(--surface-highest);
      color: var(--primary);
      font-weight: 700;
    }

    .nav-item.done {
      color: var(--secondary);
    }

    .nav-item.disabled {
      opacity: 0.4;
      pointer-events: none;
    }

    .nav-icon {
      font-size: 1.1rem;
      width: 20px;
      text-align: center;
    }

    /* Stats */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 0.4rem;
    }

    .stat-card {
      background: var(--surface-lowest);
      border-radius: var(--radius-lg);
      padding: 0.6rem 0.4rem;
      text-align: center;
      box-shadow: var(--lift-shadow);
    }

    .stat-lbl {
      font-size: 0.6rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.06em;
      color: var(--outline);
    }

    .stat-val {
      font-family: 'Manrope', sans-serif;
      font-size: 1.2rem;
      font-weight: 800;
      margin-top: 0.1rem;
    }

    .stat-val.enfa {
      color: var(--primary);
    }

    .stat-val.dfa {
      color: #7c3aed;
    }

    .stat-val.min {
      color: var(--secondary);
    }

    /* CUSTOM DROPDOWN (PREMIUM) */
    .custom-select {
      position: relative;
      width: 100%;
      user-select: none;
    }

    .cs-trigger {
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 0.7rem 1rem;
      background: var(--surface-highest);
      border: 1.5px solid var(--outline-variant);
      border-radius: var(--radius-lg);
      color: rgba(7, 30, 39, 0.6);
      font-family: 'Inter', sans-serif;
      font-size: 0.82rem;
      font-weight: 600;
      cursor: pointer;
      transition: all 0.2s var(--ease-socialite);
      position: relative;
    }

    .cs-trigger:hover {
      border-color: var(--primary);
      background: var(--surface-high);
    }

    .cs-arrow {
      position: absolute;
      right: 1rem;
      width: 16px;
      height: 16px;
      stroke: #665687;
      stroke-width: 3;
      transition: transform 0.2s var(--ease-socialite);
    }

    .custom-select.open .cs-arrow {
      transform: rotate(180deg);
    }

    .cs-options {
      position: absolute;
      top: calc(100% + 6px);
      left: 0;
      width: 100%;
      background: var(--surface);
      border: 1px solid var(--outline-variant);
      border-radius: var(--radius-lg);
      box-shadow: var(--float-shadow);
      z-index: 2000;
      display: block;
      opacity: 0;
      transform: translateY(-8px) scale(0.98);
      pointer-events: none;
      transition: all 0.2s var(--ease-socialite);
      overflow: hidden;
    }

    .custom-select.open .cs-options {
      opacity: 1;
      transform: translateY(0) scale(1);
      pointer-events: all;
    }

    .cs-option {
      padding: 0.65rem 1rem;
      font-size: 0.8rem;
      font-weight: 600;
      color: var(--on-surface-variant);
      cursor: pointer;
      transition: all 0.1s;
      border-bottom: 1px solid var(--surface-highest);
    }

    .cs-option:last-child {
      border-bottom: none;
    }

    .cs-option:hover {
      background: var(--surface-highest);
      color: var(--primary);
    }

    .cs-option.placeholder {
      color: rgba(7, 30, 39, 0.4);
      font-style: italic;
    }

    /* Utility buttons */
    .btn-secondary-sm {
      padding: 0.45rem 0.8rem;
      background: var(--surface-highest);
      border: none;
      border-radius: var(--radius-md);
      font-family: 'Inter', sans-serif;
      font-size: 0.75rem;
      font-weight: 600;
      color: var(--on-surface-variant);
      cursor: pointer;
      transition: all var(--dur-fast);
      display: flex;
      align-items: center;
      gap: 0.35rem;
    }

    .btn-secondary-sm:hover {
      background: var(--surface-high);
      color: var(--on-surface);
    }

    .btn-danger-sm {
      color: var(--tertiary);
    }

    .btn-danger-sm:hover {
      background: rgba(187, 22, 19, 0.08);
    }

    .btn-row {
      display: flex;
      gap: 0.4rem;
    }

    .btn-row>* {
      flex: 1;
      justify-content: center;
    }

    /* Computing indicator */
    .computing-pill {
      display: none;
      align-items: center;
      gap: 0.4rem;
      font-size: 0.73rem;
      color: var(--primary);
      font-weight: 600;
    }

    .computing-pill.visible {
      display: flex;
    }

    .spinner {
      width: 14px;
      height: 14px;
      border: 2px solid rgba(0, 91, 191, 0.2);
      border-top-color: var(--primary);
      border-radius: 50%;
      animation: spin 0.6s linear infinite;
    }

    @keyframes spin {
      to {
        transform: rotate(360deg);
      }
    }