:root {
    --green:      #00ff41;
    --green-dim:  #00ad2b;
    --green-dark: #003b0f;
    --green-muted:#1a4d1a;
    --bg:         #000;
    --bg2:        #050f05;
    --bg3:        #0a190a;
    --border:     #0d3b0d;
    --border-hi:  #1a6b1a;
    --text:       #a0c8a0;
    --text-dim:   #3a6b3a;
    --font: 'Share Tech Mono', 'Courier New', monospace;
  }

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

  body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    padding: 2rem;
  }

  /* subtle scanline overlay on the whole page */
  body::before {
    content: '';
    pointer-events: none;
    position: fixed;
    inset: 0;
    background: repeating-linear-gradient(
      to bottom,
      transparent 0px,
      transparent 3px,
      rgba(0,0,0,0.12) 3px,
      rgba(0,0,0,0.12) 4px
    );
    z-index: 9999;
  }

  h1 {
    font-family: var(--font);
    font-size: 0.85rem;
    font-weight: 400;
    color: var(--green);
    margin-bottom: 1.5rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    text-shadow: 0 0 8px var(--green);
  }
  h1::before { content: '> '; opacity: 0.5; }

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

  label {
    font-family: var(--font);
    font-size: 10px;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.1em;
  }

  textarea {
    font-family: var(--font);
    font-size: 12px;
    width: 100%;
    height: 180px;
    resize: both;
    overflow: auto;
    white-space: pre;
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: 0;
    padding: 10px;
    color: var(--green-dim);
    margin-bottom: 1rem;
    outline: none;
    transition: border-color 0.15s, box-shadow 0.15s;
  }
  textarea:focus {
    border-color: var(--green-dim);
    box-shadow: 0 0 6px rgba(0,173,43,0.3);
  }

  select, input[type=color] {
    width: 100%;
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: 0;
    color: var(--text);
    padding: 5px 8px;
    font-family: var(--font);
    font-size: 12px;
    outline: none;
    cursor: pointer;
    transition: border-color 0.15s;
  }
  select:focus, select:hover { border-color: var(--green-dim); }

  input[type=color] {
    height: 32px;
    padding: 2px;
    cursor: pointer;
  }

  input[type=range] {
    width: 100%;
    accent-color: var(--green-dim);
    cursor: pointer;
  }

  .range-row { display: flex; align-items: center; gap: 8px; }
  .range-row input { flex: 1; }
  .range-val {
    font-family: var(--font);
    font-size: 11px;
    color: var(--text-dim);
    min-width: 36px;
    text-align: right;
  }

  .step-btn {
    flex: none;
    width: 22px;
    height: 22px;
    padding: 0;
    font-size: 14px;
    line-height: 1;
    border-radius: 0;
    border: 1px solid var(--border);
    background: var(--bg2);
    color: var(--text-dim);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font);
    transition: border-color 0.15s, color 0.15s;
  }
  .step-btn:hover { border-color: var(--green-dim); color: var(--green); }

  .preview-wrap {
    border: 1px solid var(--border);
    overflow: auto;
    margin-bottom: 1rem;
    background: var(--bg);
    max-height: 70vh;
    padding: 0.5rem;
    display: flex;
    justify-content: center;
    align-items: flex-start;
  }

  canvas { max-width: 100%; display: block; }

  .size-note {
    font-family: var(--font);
    font-size: 10px;
    color: var(--text-dim);
    text-align: center;
    margin-bottom: 0.75rem;
  }

  .btn-row { display: flex; gap: 8px; }

  .textarea-controls {
    display: flex;
    gap: 6px;
    margin-bottom: 4px;
    justify-content: flex-end;
    align-items: center;
  }
  .textarea-controls button {
    flex: none;
    padding: 3px 10px;
    font-size: 10px;
    border-radius: 0;
    border: 1px solid var(--border);
    background: var(--bg2);
    color: var(--text-dim);
    cursor: pointer;
    font-family: var(--font);
    letter-spacing: 0.05em;
    transition: border-color 0.15s, color 0.15s;
  }
  .textarea-controls button:hover { border-color: var(--green-dim); color: var(--green); }

  button {
    flex: 1;
    padding: 9px 16px;
    border-radius: 0;
    border: 1px solid var(--border-hi);
    background: var(--bg3);
    color: var(--text);
    font-family: var(--font);
    font-size: 12px;
    letter-spacing: 0.08em;
    cursor: pointer;
    transition: border-color 0.15s, color 0.15s, box-shadow 0.15s;
    text-transform: uppercase;
  }
  button:hover {
    border-color: var(--green-dim);
    color: var(--green);
    box-shadow: 0 0 8px rgba(0,173,43,0.2);
  }
  button.primary {
    border-color: var(--green-dim);
    color: var(--green);
    background: var(--green-dark);
  }
  button.primary:hover {
    box-shadow: 0 0 12px rgba(0,255,65,0.3);
  }

  .modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.95);
    z-index: 100;
    align-items: center;
    justify-content: center;
    padding: 1rem;
  }
  .modal-overlay.open { display: flex; }
  .modal-overlay img {
    max-width: 100%;
    max-height: 100%;
    border: 1px solid var(--border-hi);
    box-shadow: 0 0 40px rgba(0,255,65,0.1);
    object-fit: contain;
  }
  .modal-close {
    position: fixed;
    top: 1rem;
    right: 1rem;
    background: var(--bg2);
    border: 1px solid var(--border-hi);
    color: var(--text);
    font-size: 16px;
    width: 32px;
    height: 32px;
    border-radius: 0;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    flex: none;
    font-family: var(--font);
    transition: color 0.15s, border-color 0.15s;
  }
  .modal-close:hover { color: var(--green); border-color: var(--green-dim); }

  .ctrl-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 1rem;
    margin-bottom: 1rem;
  }

  .ctrl-group-label {
    font-family: var(--font);
    font-size: 10px;
    color: var(--text-dim);
    letter-spacing: 0.15em;
    margin-top: 1rem;
    margin-bottom: 0.5rem;
    padding-bottom: 4px;
    border-bottom: 1px solid var(--border);
  }
  .ctrl-group-label:first-of-type { margin-top: 0; }

  .tip-wrap {
    position: relative;
    display: inline-block;
    margin-left: 4px;
    vertical-align: middle;
  }
  .tip-icon {
    font-size: 9px;
    color: var(--text-dim);
    cursor: help;
    border-bottom: 1px dashed var(--border-hi);
    user-select: none;
  }
  .tip-box {
    display: none;
    position: absolute;
    bottom: calc(100% + 5px);
    left: 0;
    z-index: 20;
    background: var(--bg2);
    border: 1px solid var(--border-hi);
    color: var(--text);
    font-family: var(--font);
    font-size: 10px;
    line-height: 1.5;
    padding: 6px 9px;
    min-width: 160px;
    max-width: 240px;
    white-space: normal;
    pointer-events: none;
    box-shadow: 0 0 12px rgba(0,0,0,0.8);
  }
  .tip-wrap:hover .tip-box { display: block; }

  .cp-swatch {
    flex: 1;
    height: 28px;
    border: 1px solid var(--border);
    cursor: pointer;
    transition: border-color 0.15s;
  }
  .cp-swatch:hover { border-color: var(--green-dim); }

  .cp-popup {
    position: fixed;
    z-index: 200;
    background: var(--bg2);
    border: 1px solid var(--border-hi);
    padding: 8px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    box-shadow: 0 8px 28px rgba(0,0,0,0.95);
    user-select: none;
  }
  .cp-sv-wrap { position: relative; }
  .cp-sv-wrap canvas { display: block; cursor: crosshair; }
  .cp-cursor {
    position: absolute;
    width: 10px; height: 10px;
    border-radius: 50%;
    border: 2px solid #fff;
    box-shadow: 0 0 0 1px rgba(0,0,0,0.7);
    transform: translate(-50%, -50%);
    pointer-events: none;
  }
  .cp-hue-wrap { position: relative; }
  .cp-hue-wrap canvas { display: block; cursor: crosshair; }
  .cp-hue-cursor {
    position: absolute;
    top: 0; bottom: 0;
    width: 3px;
    background: rgba(255,255,255,0.9);
    box-shadow: 0 0 0 1px rgba(0,0,0,0.6);
    transform: translateX(-50%);
    pointer-events: none;
  }
  .cp-bottom {
    display: flex;
    align-items: center;
    gap: 6px;
  }
  .cp-preview {
    width: 28px; height: 28px;
    border: 1px solid var(--border-hi);
    flex-shrink: 0;
  }
  .cp-hash {
    font-family: var(--font);
    font-size: 11px;
    color: var(--text-dim);
  }
  .cp-hex {
    font-family: var(--font);
    font-size: 12px;
    background: var(--bg);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 3px 6px;
    width: 76px;
    outline: none;
    text-transform: uppercase;
    letter-spacing: 0.05em;
  }
  .cp-hex:focus { border-color: var(--green-dim); }

  /* scrollbar */
  ::-webkit-scrollbar { width: 6px; height: 6px; }
  ::-webkit-scrollbar-track { background: var(--bg); }
  ::-webkit-scrollbar-thumb { background: var(--border-hi); }
  ::-webkit-scrollbar-thumb:hover { background: var(--green-dim); }