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

    :root {
      --bg:        #0d0b14;
      --surface:   #15102a;
      --surface2:  #1c1535;
      --border:    #3d2b6b;
      --border2:   #3a2960;
      --accent:    #a87dff;
      --accent2:   #7c55d4;
      --accent-dim:#2a1650;
      --green:     #7dcc5a;
      --green-bg:  #162212;
      --red:       #f87171;
      --txt:       #e0d4ff;
      --muted:     #6b5e8a;
      --muted2:    #5c4e7a;
    }

    body {
      background: var(--bg);
      color: var(--txt);
      font-family: 'Segoe UI', system-ui, sans-serif;
      min-height: 100vh;
      display: flex;
      flex-direction: column;
      align-items: center;
      position: relative;
      overflow-x: hidden;
    }

    body::before {
      content: '';
      position: fixed;
      top: -150px; left: 50%; transform: translateX(-50%);
      width: 700px; height: 700px;
      background: radial-gradient(ellipse at center, #3b1d7a28 0%, transparent 70%);
      pointer-events: none;
      z-index: 0;
    }

    /* ── Header ── */
    header {
      width: 100%;
      padding: 22px 32px 20px;
      border-bottom: 1px solid var(--border2);
      display: flex;
      align-items: center;
      gap: 16px;
      position: relative;
      z-index: 1;
    }

    .back-btn {
      display: flex;
      align-items: center;
      justify-content: center;
      width: 34px; height: 34px;
      background: var(--surface2);
      border: 1px solid var(--border2);
      border-radius: 8px;
      color: var(--muted);
      text-decoration: none;
      font-size: 17px;
      transition: color 0.15s, border-color 0.15s;
      flex-shrink: 0;
    }
    .back-btn:hover { color: var(--accent); border-color: var(--accent2); }

    .header-brand {
      display: flex;
      flex-direction: column;
    }
    .header-suite {
      font-size: 10px;
      color: var(--muted2);
      letter-spacing: 0.12em;
      text-transform: uppercase;
      margin-bottom: 2px;
    }
    .header-title {
      font-size: 18px;
      font-weight: 600;
      color: var(--txt);
      letter-spacing: 0.02em;
    }
    .header-title span { color: var(--accent); }

    /* ── Shell ── */
    .shell {
      width: 100%;
      max-width: 940px;
      padding: 32px 24px 64px;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      position: relative;
      z-index: 1;
    }
    @media (max-width: 680px) {
      .shell { grid-template-columns: 1fr; }
      header { padding: 16px 20px; }
    }

    /* ── Cards ── */
    .card {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: 16px;
      padding: 22px;
    }
    .card-title {
      font-size: 10px;
      font-weight: 600;
      letter-spacing: 0.12em;
      text-transform: uppercase;
      color: var(--muted2);
      margin-bottom: 14px;
    }

    /* ── Drop Zone ── */
    #drop-zone {
      grid-column: 1 / -1;
      border: 2px dashed var(--border2);
      border-radius: 14px;
      padding: 44px 24px;
      text-align: center;
      cursor: pointer;
      transition: border-color 0.2s, background 0.2s;
      background: transparent;
      position: relative;
    }
    #drop-zone:hover, #drop-zone.drag-over {
      border-color: var(--accent2);
      background: rgba(168,125,255,0.04);
    }
    #drop-zone .drop-icon {
      font-size: 36px;
      color: var(--muted2);
      margin-bottom: 10px;
      display: block;
    }
    #drop-zone h2 {
      font-size: 1rem;
      font-weight: 600;
      color: var(--txt);
      margin-bottom: 6px;
    }
    #drop-zone p { font-size: 0.78rem; color: var(--muted); }
    #drop-zone input[type=file] {
      position: absolute; inset: 0; opacity: 0; cursor: pointer;
    }
    #file-count-badge {
      margin-top: 12px;
      font-size: 0.75rem;
      background: rgba(168,125,255,0.1);
      color: var(--accent);
      border: 1px solid rgba(168,125,255,0.25);
      border-radius: 6px;
      padding: 5px 14px;
      display: none;
    }

    /* ── Config ── */
    label.field-label {
      display: block;
      font-size: 0.72rem;
      color: var(--muted);
      margin-bottom: 6px;
      letter-spacing: 0.04em;
    }
    input[type=number], input[type=text] {
      width: 100%;
      background: var(--bg);
      border: 1px solid var(--border2);
      border-radius: 8px;
      color: var(--txt);
      font-size: 0.95rem;
      font-family: inherit;
      padding: 10px 13px;
      outline: none;
      transition: border-color 0.15s;
    }
    input[type=number]:focus, input[type=text]:focus { border-color: var(--accent2); }
    input[type=number]::-webkit-inner-spin-button { opacity: 1; }

    .folder-name-prefix { margin-top: 14px; }

    /* ── Toggle ── */
    .toggle-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      padding: 10px 12px;
      background: var(--bg);
      border: 1px solid var(--border2);
      border-radius: 8px;
      margin-top: 14px;
    }
    .toggle-row > label {
      font-size: 0.7rem;
      color: var(--muted);
      cursor: pointer;
      user-select: none;
      line-height: 1.4;
    }
    .toggle-row > label span { display: block; color: var(--txt); font-size: 0.78rem; margin-bottom: 2px; }
    .switch { position: relative; width: 36px; height: 20px; flex-shrink: 0; }
    .switch input { opacity: 0; width: 0; height: 0; }
    .slider {
      position: absolute; inset: 0;
      background: var(--border2);
      border-radius: 20px;
      cursor: pointer;
      transition: background 0.2s;
    }
    .slider::before {
      content: '';
      position: absolute;
      width: 14px; height: 14px;
      left: 3px; top: 3px;
      background: #fff;
      border-radius: 50%;
      transition: transform 0.2s;
    }
    .switch input:checked + .slider { background: var(--accent2); }
    .switch input:checked + .slider::before { transform: translateX(16px); }

    /* ── Tags ── */
    .tag {
      display: inline-block;
      font-size: 0.65rem;
      padding: 2px 8px;
      border-radius: 4px;
      margin-right: 4px;
      margin-bottom: 4px;
    }
    .tag-img  { background: rgba(168,125,255,0.1); color: var(--accent); border: 1px solid rgba(168,125,255,0.22); }
    .tag-skip { background: rgba(248,113,113,0.08); color: var(--red); border: 1px solid rgba(248,113,113,0.2); }

    /* ── Preview ── */
    #preview-card { grid-column: 1 / -1; display: none; }

    .dist-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 14px;
    }
    .dist-stat {
      font-size: 0.73rem;
      color: var(--muted);
    }
    .dist-stat strong { color: var(--txt); }

    /* UML */
    #uml-wrap { overflow-x: auto; padding-bottom: 6px; }
    .uml-diagram {
      display: flex;
      gap: 8px;
      align-items: flex-start;
      min-width: max-content;
      padding: 4px 2px;
    }
    .uml-folder {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 5px;
      min-width: 76px;
    }
    .uml-folder-box {
      width: 68px;
      background: var(--bg);
      border: 1px solid var(--border2);
      border-radius: 6px;
      overflow: hidden;
    }
    .uml-folder-tab {
      height: 7px;
      width: 32px;
      background: var(--accent2);
      border-radius: 3px 3px 0 0;
      margin: -1px 0 0 5px;
    }
    .uml-folder-body { padding: 5px; display: flex; flex-direction: column; gap: 2px; }
    .uml-file-bar { height: 4px; border-radius: 2px; background: var(--accent); }
    .uml-folder-count { font-size: 0.62rem; color: var(--accent); font-weight: 500; }
    .uml-folder-name  { font-size: 0.58rem; color: var(--muted); text-align: center; word-break: break-all; }
    .uml-connector    { display: flex; align-items: center; padding-top: 28px; color: var(--border2); font-size: 1rem; }

    /* Bars */
    .bar-section { margin-top: 18px; }
    .bar-row {
      display: flex;
      align-items: center;
      gap: 10px;
      margin-bottom: 5px;
      font-size: 0.7rem;
    }
    .bar-label { color: var(--muted); width: 80px; text-align: right; flex-shrink: 0; }
    .bar-track {
      flex: 1;
      height: 14px;
      background: var(--bg);
      border-radius: 4px;
      overflow: hidden;
      border: 1px solid var(--border2);
    }
    .bar-fill {
      height: 100%;
      border-radius: 4px;
      background: linear-gradient(90deg, var(--accent2), var(--accent));
      transition: width 0.4s ease;
    }
    .bar-val { color: var(--txt); width: 32px; }

    /* ── Action button ── */
    #sort-btn {
      grid-column: 1 / -1;
      width: 100%;
      padding: 15px;
      background: var(--accent2);
      color: #fff;
      border: none;
      border-radius: 12px;
      font-size: 1rem;
      font-weight: 600;
      font-family: inherit;
      cursor: pointer;
      letter-spacing: 0.01em;
      transition: background 0.15s, transform 0.1s;
    }
    #sort-btn:hover { background: var(--accent); }
    #sort-btn:active { transform: scale(0.98); }
    #sort-btn:disabled {
      background: #1c1535;
      color: var(--muted);
      cursor: not-allowed;
      border: 1px solid var(--border2);
    }

    /* ── Progress ── */
    #progress-card { grid-column: 1 / -1; display: none; }
    .progress-track {
      width: 100%;
      height: 6px;
      background: var(--bg);
      border-radius: 3px;
      overflow: hidden;
      margin: 10px 0 7px;
      border: 1px solid var(--border2);
    }
    .progress-fill {
      height: 100%;
      background: linear-gradient(90deg, var(--accent2), var(--accent));
      border-radius: 3px;
      width: 0%;
      transition: width 0.2s;
    }
    .progress-label { font-size: 0.7rem; color: var(--muted); }

    /* ── Results ── */
    #result-card { grid-column: 1 / -1; display: none; }
    .result-list {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
      gap: 8px;
      margin-top: 12px;
    }
    .result-folder {
      background: var(--bg);
      border: 1px solid var(--border2);
      border-radius: 8px;
      padding: 11px 13px;
      font-size: 0.7rem;
    }
    .result-folder .rf-name { color: var(--accent); font-weight: 600; margin-bottom: 3px; word-break: break-all; }
    .result-folder .rf-count { color: var(--muted); }

    #download-btn {
      margin-top: 14px;
      padding: 12px 26px;
      background: var(--green-bg);
      color: var(--green);
      border: 1px solid rgba(125,204,90,0.3);
      border-radius: 8px;
      font-size: 0.88rem;
      font-weight: 600;
      font-family: inherit;
      cursor: pointer;
      transition: background 0.15s, border-color 0.15s;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    #download-btn:hover { background: #1e2e14; border-color: var(--green); }

    /* ── Toast ── */
    #toast {
      position: fixed;
      bottom: 24px; right: 24px;
      background: var(--surface);
      border: 1px solid var(--border2);
      border-radius: 10px;
      padding: 11px 16px;
      font-size: 0.76rem;
      color: var(--txt);
      display: none;
      z-index: 999;
      box-shadow: 0 8px 24px rgba(0,0,0,0.5);
    }
    #toast.show { display: block; }
    #toast.err  { border-color: var(--red); color: var(--red); }
    #toast.ok   { border-color: rgba(125,204,90,0.5); color: var(--green); }