:root {
    --bg: #0a0b0e;
    --surface: #111318;
    --surface2: #181b22;
    --surface3: #1e2230;
    --border: #2a2f3d;
    --border2: #363c50;
    --accent: #00e5ff;
    --accent2: #7c3aed;
    --accent3: #f59e0b;
    --green: #10b981;
    --red: #ef4444;
    --text: #e2e8f0;
    --text2: #94a3b8;
    --text3: #64748b;
    --glow: rgba(0,229,255,0.15);
    --glow2: rgba(124,58,237,0.12);
    --radius: 8px;
    --font-mono: 'JetBrains Mono', monospace;
    --font-ui: 'Space Grotesk', sans-serif;
  }
  [data-theme="light"] {
    --bg: #f0f2f8;
    --surface: #ffffff;
    --surface2: #f8f9fc;
    --surface3: #eef0f8;
    --border: #d1d5e8;
    --border2: #b8bdd6;
    --text: #1e2235;
    --text2: #4a5068;
    --text3: #8890a8;
    --glow: rgba(0,180,220,0.08);
    --glow2: rgba(100,40,200,0.06);
  }
  *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
  html { font-size: 14px; scroll-behavior: smooth; }
  body {
    font-family: var(--font-ui);
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    overflow-x: hidden;
  }

  /* SCANLINES OVERLAY */
  body::before {
    content: '';
    position: fixed; inset: 0;
    background: repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(0,0,0,0.03) 2px, rgba(0,0,0,0.03) 4px);
    pointer-events: none; z-index: 9999;
  }

  /* HEADER */
  header {
    padding: 18px 24px;
    border-bottom: 1px solid var(--border);
    background: var(--surface);
    display: flex; align-items: center; justify-content: space-between;
    position: sticky; top: 0; z-index: 100;
    backdrop-filter: blur(12px);
  }
  .logo {
    display: flex; align-items: center; gap: 10px;
    font-family: var(--font-mono);
    font-weight: 700; font-size: 1.15rem;
    letter-spacing: -0.02em; color: var(--text);
  }
  .logo-icon {
    width: 32px; height: 32px; border-radius: 8px;
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    display: flex; align-items: center; justify-content: center;
    font-size: 0.85rem; color: #fff;
    box-shadow: 0 0 16px var(--glow);
  }
  .logo-tag { color: var(--accent); }
  .header-right { display: flex; align-items: center; gap: 12px; }
  .kbd-hint { font-family: var(--font-mono); font-size: 0.7rem; color: var(--text3); }
  .theme-btn {
    background: var(--surface2); border: 1px solid var(--border);
    color: var(--text2); padding: 6px 12px; border-radius: 6px;
    cursor: pointer; font-family: var(--font-ui); font-size: 0.8rem;
    transition: all 0.2s; display: flex; align-items: center; gap: 6px;
  }
  .theme-btn:hover { border-color: var(--accent); color: var(--accent); }

  /* LAYOUT */
  .container { display: flex; height: calc(100vh - 57px); }

  /* SIDEBAR TABS */
  .sidebar {
    width: 200px; flex-shrink: 0;
    background: var(--surface);
    border-right: 1px solid var(--border);
    display: flex; flex-direction: column;
    padding: 12px 8px; gap: 2px;
    overflow-y: auto;
  }
  .sidebar-label {
    font-family: var(--font-mono); font-size: 0.6rem;
    color: var(--text3); letter-spacing: 0.1em;
    text-transform: uppercase; padding: 8px 8px 4px;
    margin-top: 6px;
  }
  .tab-btn {
    display: flex; align-items: center; gap: 8px;
    padding: 8px 10px; border-radius: 6px;
    border: none; background: transparent;
    color: var(--text2); cursor: pointer;
    font-family: var(--font-ui); font-size: 0.82rem;
    transition: all 0.15s; text-align: left; width: 100%;
  }
  .tab-btn:hover { background: var(--surface2); color: var(--text); }
  .tab-btn.active {
    background: var(--surface3);
    color: var(--accent);
    border-left: 2px solid var(--accent);
  }
  .tab-btn .icon { font-size: 0.85rem; width: 16px; text-align: center; flex-shrink: 0; }

  /* MAIN CONTENT */
  .main { flex: 1; display: flex; flex-direction: column; overflow: hidden; }

  /* INPUT PANEL */
  .input-panel {
    padding: 16px 20px 12px;
    border-bottom: 1px solid var(--border);
    background: var(--surface);
  }
  .panel-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 8px; }
  .panel-title { font-family: var(--font-mono); font-size: 0.7rem; color: var(--text3); text-transform: uppercase; letter-spacing: 0.1em; }
  .stats-bar { display: flex; gap: 14px; }
  .stat { font-family: var(--font-mono); font-size: 0.72rem; color: var(--text3); }
  .stat span { color: var(--accent); }
  .input-actions { display: flex; gap: 6px; }
  .icon-btn {
    background: var(--surface2); border: 1px solid var(--border);
    color: var(--text3); padding: 4px 8px; border-radius: 5px;
    cursor: pointer; font-size: 0.75rem; font-family: var(--font-ui);
    transition: all 0.15s; display: flex; align-items: center; gap: 4px;
  }
  .icon-btn:hover { border-color: var(--border2); color: var(--text); }
  textarea {
    width: 100%; background: var(--surface2);
    border: 1px solid var(--border); border-radius: var(--radius);
    color: var(--text); font-family: var(--font-mono);
    font-size: 0.82rem; padding: 10px 12px; resize: vertical;
    outline: none; transition: border-color 0.2s;
    line-height: 1.6;
  }
  textarea:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--glow); }
  textarea.drag-over { border-color: var(--accent); background: var(--surface3); }
  #inputArea { height: 120px; }

  /* TOOL PANEL */
  .tool-panel { flex: 1; overflow-y: auto; padding: 16px 20px; }
  .panel-section { display: none; }
  .panel-section.active { display: block; }
  .section-title {
    font-family: var(--font-mono); font-size: 0.65rem;
    color: var(--text3); text-transform: uppercase; letter-spacing: 0.12em;
    margin-bottom: 10px; display: flex; align-items: center; gap: 8px;
  }
  .section-title::after { content: ''; flex: 1; height: 1px; background: var(--border); }

  /* BUTTON GRID */
  .btn-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); gap: 6px; margin-bottom: 16px; }
  .btn-grid-3 { grid-template-columns: repeat(auto-fill, minmax(100px, 1fr)); }
  .tool-btn {
    background: var(--surface2); border: 1px solid var(--border);
    color: var(--text2); padding: 8px 10px; border-radius: 6px;
    cursor: pointer; font-family: var(--font-mono); font-size: 0.75rem;
    transition: all 0.15s; text-align: left;
    display: flex; align-items: center; gap: 6px;
    position: relative; overflow: hidden;
  }
  .tool-btn::before {
    content: ''; position: absolute; inset: 0;
    background: linear-gradient(135deg, var(--accent), transparent);
    opacity: 0; transition: opacity 0.2s;
  }
  .tool-btn:hover { border-color: var(--accent); color: var(--text); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(0,229,255,0.1); }
  .tool-btn:hover::before { opacity: 0.05; }
  .tool-btn:active { transform: translateY(0); }
  .tool-btn .btn-icon { font-size: 0.9rem; }

  /* OUTPUT */
  .output-wrapper { margin-top: 16px; }
  .output-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 8px; }
  .output-actions { display: flex; gap: 6px; }
  .btn-primary {
    background: linear-gradient(135deg, var(--accent), #0099bb);
    border: none; color: #000; padding: 6px 14px; border-radius: 6px;
    cursor: pointer; font-family: var(--font-mono); font-size: 0.75rem;
    font-weight: 600; transition: all 0.2s;
  }
  .btn-primary:hover { transform: translateY(-1px); box-shadow: 0 4px 16px var(--glow); }
  .btn-secondary {
    background: var(--surface2); border: 1px solid var(--border);
    color: var(--text2); padding: 6px 12px; border-radius: 6px;
    cursor: pointer; font-family: var(--font-mono); font-size: 0.75rem;
    transition: all 0.15s;
  }
  .btn-secondary:hover { border-color: var(--border2); color: var(--text); }
  #outputArea { height: 100px; min-height: 80px; }

  /* SEARCH REPLACE */
  .sr-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-bottom: 10px; }
  .field-group { display: flex; flex-direction: column; gap: 4px; }
  .field-label { font-family: var(--font-mono); font-size: 0.65rem; color: var(--text3); }
  input[type="text"], input[type="number"] {
    background: var(--surface2); border: 1px solid var(--border);
    color: var(--text); font-family: var(--font-mono); font-size: 0.8rem;
    padding: 7px 10px; border-radius: 6px; outline: none;
    transition: border-color 0.2s; width: 100%;
  }
  input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--glow); }
  .toggle-row { display: flex; align-items: center; gap: 8px; margin: 6px 0; }
  .toggle-label { font-family: var(--font-mono); font-size: 0.75rem; color: var(--text2); }
  .toggle {
    position: relative; width: 32px; height: 18px; cursor: pointer;
  }
  .toggle input { opacity: 0; width: 0; height: 0; }
  .slider {
    position: absolute; inset: 0;
    background: var(--border); border-radius: 18px;
    transition: 0.2s;
  }
  .slider::before {
    content: ''; position: absolute;
    width: 12px; height: 12px; left: 3px; bottom: 3px;
    background: var(--text3); border-radius: 50%; transition: 0.2s;
  }
  .toggle input:checked + .slider { background: var(--accent); }
  .toggle input:checked + .slider::before { transform: translateX(14px); background: #000; }

  /* PASSWORD GENERATOR */
  .pwd-length-row { display: flex; align-items: center; gap: 12px; margin-bottom: 10px; }
  input[type="range"] {
    flex: 1; accent-color: var(--accent); cursor: pointer;
  }
  .pwd-length-val { font-family: var(--font-mono); font-size: 0.9rem; color: var(--accent); min-width: 28px; text-align: center; }
  .pwd-options { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; margin-bottom: 12px; }
  .pwd-display {
    background: var(--surface2); border: 1px solid var(--border);
    border-radius: 8px; padding: 12px 14px;
    display: flex; align-items: center; justify-content: space-between;
    gap: 10px; margin-bottom: 10px;
  }
  .pwd-value {
    font-family: var(--font-mono); font-size: 0.88rem;
    color: var(--text); word-break: break-all; flex: 1;
    letter-spacing: 0.05em;
  }
  .strength-bar { height: 4px; border-radius: 2px; margin-bottom: 4px; transition: all 0.3s; }
  .strength-label { font-family: var(--font-mono); font-size: 0.68rem; color: var(--text3); }

  /* JSON / ARRAY */
  .csv-hint { font-family: var(--font-mono); font-size: 0.68rem; color: var(--text3); margin-bottom: 6px; }

  /* TOAST */
  .toast {
    position: fixed; bottom: 24px; right: 24px;
    background: var(--surface3); border: 1px solid var(--accent);
    color: var(--text); font-family: var(--font-mono); font-size: 0.78rem;
    padding: 10px 16px; border-radius: 8px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.4), 0 0 16px var(--glow);
    transform: translateY(80px); opacity: 0;
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    z-index: 10000; display: flex; align-items: center; gap: 8px;
  }
  .toast.show { transform: translateY(0); opacity: 1; }
  .toast-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }

  /* SCROLLBAR */
  ::-webkit-scrollbar { width: 6px; }
  ::-webkit-scrollbar-track { background: var(--surface); }
  ::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 3px; }
  ::-webkit-scrollbar-thumb:hover { background: var(--text3); }

  /* BADGE */
  .badge {
    font-family: var(--font-mono); font-size: 0.6rem;
    background: var(--surface3); border: 1px solid var(--border);
    color: var(--text3); padding: 1px 5px; border-radius: 3px;
  }

  /* CHECKBOX */
  .check-item {
    display: flex; align-items: center; gap: 8px;
    cursor: pointer; padding: 5px 8px; border-radius: 5px;
    border: 1px solid var(--border); background: var(--surface2);
    transition: all 0.15s;
  }
  .check-item:hover { border-color: var(--border2); }
  .check-item input[type="checkbox"] { accent-color: var(--accent); cursor: pointer; }
  .check-item label { font-family: var(--font-mono); font-size: 0.73rem; color: var(--text2); cursor: pointer; }

  /* MOBILE */
  @media (max-width: 768px) {
    .sidebar { width: 52px; }
    .tab-btn span.label { display: none; }
    .sidebar-label { display: none; }
    .kbd-hint { display: none; }
    #inputArea { height: 80px; }
  }

  /* SQL GENERATOR */
  .sql-dropzone {
    border: 2px dashed var(--border2);
    border-radius: 12px;
    padding: 32px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.25s;
    background: var(--surface2);
    position: relative;
    margin-bottom: 14px;
  }
  .sql-dropzone:hover, .sql-dropzone.drag-active {
    border-color: var(--accent);
    background: var(--surface3);
    box-shadow: 0 0 24px var(--glow);
  }
  .sql-dropzone.has-data { border-style: solid; border-color: var(--green); }
  .sql-dropzone input[type="file"] { position: absolute; inset: 0; opacity: 0; cursor: pointer; width: 100%; height: 100%; }
  .dropzone-icon { font-size: 2.2rem; margin-bottom: 8px; display: block; }
  .dropzone-title { font-family: var(--font-mono); font-size: 0.9rem; color: var(--text); margin-bottom: 4px; }
  .dropzone-sub { font-family: var(--font-mono); font-size: 0.72rem; color: var(--text3); }
  .dropzone-filename { font-family: var(--font-mono); font-size: 0.78rem; color: var(--green); margin-top: 6px; }

  .sql-config { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 12px; }
  .sql-config-wide { grid-column: 1 / -1; }

  .preview-table-wrap {
    overflow: auto; max-height: 200px;
    border: 1px solid var(--border); border-radius: 8px;
    margin-bottom: 14px; background: var(--surface2);
  }
  table.preview-table {
    width: 100%; border-collapse: collapse;
    font-family: var(--font-mono); font-size: 0.72rem;
  }
  .preview-table th {
    background: var(--surface3); color: var(--accent);
    padding: 6px 10px; text-align: left;
    border-bottom: 1px solid var(--border); white-space: nowrap;
    position: sticky; top: 0; z-index: 2;
  }
  .preview-table td {
    padding: 5px 10px; color: var(--text2);
    border-bottom: 1px solid var(--border);
    white-space: nowrap; max-width: 160px;
    overflow: hidden; text-overflow: ellipsis;
  }
  .preview-table tr:hover td { background: var(--surface3); color: var(--text); }
  .preview-table tr:last-child td { border-bottom: none; }
  .preview-badge { font-family: var(--font-mono); font-size: 0.68rem; color: var(--text3); margin-bottom: 8px; }

  .type-tag {
    display: inline-block; font-family: var(--font-mono); font-size: 0.6rem;
    background: var(--surface3); border: 1px solid var(--border);
    color: var(--accent2); padding: 1px 5px; border-radius: 3px;
    margin-left: 4px;
  }

  .sql-query-tabs { display: flex; gap: 4px; margin-bottom: 8px; flex-wrap: wrap; }
  .sql-qtab {
    font-family: var(--font-mono); font-size: 0.72rem;
    padding: 5px 12px; border-radius: 5px;
    border: 1px solid var(--border); background: var(--surface2);
    color: var(--text3); cursor: pointer; transition: all 0.15s;
  }
  .sql-qtab.active { background: var(--surface3); border-color: var(--accent); color: var(--accent); }
  .sql-qtab:hover { border-color: var(--border2); color: var(--text); }

  .sql-output {
    background: var(--surface2); border: 1px solid var(--border);
    border-radius: 8px; padding: 12px 14px;
    font-family: var(--font-mono); font-size: 0.76rem;
    color: var(--text2); white-space: pre; overflow: auto;
    max-height: 280px; line-height: 1.7;
  }
  .sql-kw { color: #60a5fa; }
  .sql-tbl { color: #34d399; }
  .sql-col { color: #f9a8d4; }
  .sql-val { color: #fcd34d; }
  .sql-cmt { color: var(--text3); font-style: italic; }

  /* GLOW EFFECT ON CARDS */
  .glow-card {
    position: relative;
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: 8px; padding: 14px;
    margin-bottom: 14px;
  }
  .glow-card::before {
    content: ''; position: absolute;
    inset: 0; border-radius: 8px;
    background: linear-gradient(135deg, var(--glow), var(--glow2));
    opacity: 0; transition: opacity 0.3s; pointer-events: none;
  }
  .glow-card:hover::before { opacity: 1; }