/* ── CSS VARIABLES ── */
  :root {
    --bg:       #0d0f14;
    --surface:  #141720;
    --panel:    #1a1e2e;
    --border:   #252a3d;
    --border2:  #2f3550;
    --accent:   #4f9cf9;
    --accent2:  #7c3aed;
    --green:    #22d3a0;
    --amber:    #f59e0b;
    --red:      #f43f5e;
    --text:     #e2e8f0;
    --muted:    #64748b;
    --muted2:   #94a3b8;
    --tag-bg:   #1e2433;
    --mono:     'IBM Plex Mono', monospace;
    --sans:     'IBM Plex Sans', sans-serif;
  }

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

  html, body {
    height: 100%;
    background: var(--bg);
    color: var(--text);
    font-family: var(--sans);
    font-size: 14px;
    line-height: 1.5;
    overflow-x: hidden;
  }

  /* ── ANTI-HOTLINK: block iframe embedding ── */
  /* enforced server-side via nginx X-Frame-Options */

  /* ── LAYOUT ── */
  .app {
    display: grid;
    grid-template-rows: auto 1fr auto;
    min-height: 100vh;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 16px;
  }

  /* ── HEADER ── */
  header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 0;
    border-bottom: 1px solid var(--border);
  }

  .logo {
    display: flex;
    align-items: center;
    gap: 10px;
  }

  .logo-icon {
    width: 32px; height: 32px;
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    border-radius: 8px;
    display: flex; align-items: center; justify-content: center;
    font-family: var(--mono);
    font-weight: 600;
    font-size: 11px;
    color: white;
    letter-spacing: -0.5px;
  }

  .logo-text {
    font-family: var(--mono);
    font-weight: 600;
    font-size: 15px;
    letter-spacing: 0.5px;
    color: var(--text);
  }

  .logo-text span { color: var(--accent); }

  .header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
  }

  /* ── GOOGLE ADS SLOT – HEADER BANNER ── */
  .ad-header {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 60px;
    background: var(--surface);
    border: 1px dashed var(--border2);
    border-radius: 6px;
    color: var(--muted);
    font-size: 11px;
    margin: 10px 0;
    /* Replace contents with <ins class="adsbygoogle"> block */
  }

  /* ── MAIN ── */
  main {
    display: flex;
    flex-direction: column;
    gap: 16px;
    padding: 16px 0;
  }

  /* ── PANEL CARD ── */
  .card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    overflow: hidden;
  }

  .card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    background: var(--panel);
    border-bottom: 1px solid var(--border);
  }

  .card-title {
    font-family: var(--mono);
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--muted2);
  }

  .card-actions {
    display: flex;
    gap: 6px;
    align-items: center;
  }

  /* ── BUTTONS ── */
  .btn {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 5px 12px;
    border-radius: 6px;
    border: 1px solid var(--border2);
    background: var(--panel);
    color: var(--muted2);
    font-family: var(--mono);
    font-size: 11px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s;
    white-space: nowrap;
  }
  .btn:hover { background: var(--border); color: var(--text); border-color: var(--accent); }
  .btn.primary { background: var(--accent); color: white; border-color: var(--accent); }
  .btn.primary:hover { background: #3b82f6; }
  .btn.danger { border-color: var(--red); color: var(--red); }
  .btn.danger:hover { background: rgba(244,63,94,0.1); }
  .btn.success { border-color: var(--green); color: var(--green); }
  .btn.success:hover { background: rgba(34,211,160,0.1); }

  /* ── INTERACTIVE VIEWER ── */
  #fix-tree {
    padding: 8px 0;
    min-height: 120px;
    max-height: 55vh;
    overflow-y: auto;
  }

  #fix-tree::-webkit-scrollbar { width: 6px; }
  #fix-tree::-webkit-scrollbar-track { background: transparent; }
  #fix-tree::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 3px; }

  .tree-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px 0;
    color: var(--muted);
    gap: 8px;
  }

  .tree-empty svg { opacity: 0.3; }
  .tree-empty p { font-size: 13px; }

  /* ── FIELD ROW ── */
  .field-row {
    display: grid;
    grid-template-columns: 70px 220px 1fr auto;
    align-items: center;
    gap: 0;
    padding: 2px 16px;
    transition: background 0.1s;
    border-bottom: 1px solid transparent;
  }

  .field-row:hover { background: var(--panel); }
  .field-row.header-field { background: rgba(79,156,249,0.04); }

  .field-tag {
    font-family: var(--mono);
    font-size: 11px;
    font-weight: 600;
    color: var(--accent);
    padding: 5px 8px 5px 0;
  }

  .field-label {
    font-size: 12px;
    color: var(--muted2);
    padding: 5px 12px 5px 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .field-value-wrap {
    display: flex;
    align-items: center;
  }

  .field-value {
    font-family: var(--mono);
    font-size: 12px;
    color: var(--text);
    background: transparent;
    border: 1px solid transparent;
    border-radius: 4px;
    padding: 3px 6px;
    width: 100%;
    max-width: 320px;
    transition: border 0.15s, background 0.15s;
    outline: none;
  }

  .field-value:hover { border-color: var(--border2); background: var(--panel); }
  .field-value:focus { border-color: var(--accent); background: var(--panel); color: var(--accent); }

  .field-enum {
    font-family: var(--mono);
    font-size: 11px;
    color: var(--green);
    margin-left: 8px;
    white-space: nowrap;
  }

  .field-actions {
    display: flex;
    gap: 4px;
    opacity: 0;
    transition: opacity 0.15s;
  }

  .field-row:hover .field-actions { opacity: 1; }

  .icon-btn {
    width: 22px; height: 22px;
    display: flex; align-items: center; justify-content: center;
    border-radius: 4px;
    border: none;
    background: transparent;
    color: var(--muted);
    cursor: pointer;
    font-size: 13px;
    transition: background 0.1s, color 0.1s;
  }
  .icon-btn:hover { background: var(--border); color: var(--red); }
  .icon-btn.add:hover { color: var(--green); }

  /* ── GROUP HEADER ── */
  .group-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    background: var(--panel);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    cursor: pointer;
    user-select: none;
    transition: background 0.1s;
  }

  .group-header:hover { background: var(--border); }

  .group-tag {
    font-family: var(--mono);
    font-size: 11px;
    font-weight: 600;
    color: var(--amber);
  }

  .group-label {
    font-size: 12px;
    color: var(--muted2);
    flex: 1;
  }

  .group-count {
    font-family: var(--mono);
    font-size: 10px;
    color: var(--muted);
    background: var(--bg);
    padding: 1px 6px;
    border-radius: 10px;
    border: 1px solid var(--border2);
  }

  .chevron {
    color: var(--muted);
    font-size: 10px;
    transition: transform 0.2s;
  }
  .chevron.open { transform: rotate(90deg); }

  .group-body { overflow: hidden; }
  .group-body.collapsed { display: none; }

  .group-instance {
    border-left: 2px solid var(--amber);
    margin-left: 24px;
    padding-left: 4px;
    margin-bottom: 2px;
  }

  .instance-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 3px 16px 3px 12px;
    background: rgba(245,158,11,0.04);
  }

  .instance-label {
    font-family: var(--mono);
    font-size: 10px;
    color: var(--amber);
    opacity: 0.7;
  }

  /* ── ADD FIELD FORM ── */
  .add-field-bar {
    display: flex;
    gap: 8px;
    align-items: center;
    padding: 8px 16px;
    background: var(--panel);
    border-top: 1px solid var(--border);
    flex-wrap: wrap;
  }

  .add-field-bar input, .add-field-bar select {
    background: var(--bg);
    border: 1px solid var(--border2);
    border-radius: 5px;
    color: var(--text);
    font-family: var(--mono);
    font-size: 12px;
    padding: 5px 8px;
    outline: none;
    transition: border 0.15s;
  }

  .add-field-bar input:focus, .add-field-bar select:focus { border-color: var(--accent); }
  .add-field-bar input[type="number"] { width: 80px; }
  .add-field-bar input[type="text"] { width: 160px; }

  /* ── RAW EDITOR ── */
  .raw-section {
    display: flex;
    flex-direction: column;
  }

  .sep-row {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 16px;
    background: var(--panel);
    border-bottom: 1px solid var(--border);
    flex-wrap: wrap;
  }

  .sep-label {
    font-size: 12px;
    color: var(--muted2);
    white-space: nowrap;
  }

  .sep-option {
    display: flex;
    align-items: center;
    gap: 5px;
    padding: 4px 10px;
    border-radius: 5px;
    border: 1px solid var(--border2);
    cursor: pointer;
    font-family: var(--mono);
    font-size: 11px;
    color: var(--muted2);
    background: var(--bg);
    transition: all 0.15s;
    white-space: nowrap;
  }
  .sep-option:hover { border-color: var(--accent); color: var(--text); }
  .sep-option.active { border-color: var(--accent); color: var(--accent); background: rgba(79,156,249,0.08); }

  .sep-custom {
    display: flex;
    align-items: center;
    gap: 6px;
  }
  .sep-custom input {
    width: 50px;
    background: var(--bg);
    border: 1px solid var(--border2);
    border-radius: 5px;
    color: var(--text);
    font-family: var(--mono);
    font-size: 12px;
    padding: 4px 6px;
    outline: none;
    text-align: center;
  }
  .sep-custom input:focus { border-color: var(--accent); }

  #raw-input {
    font-family: var(--mono);
    font-size: 12px;
    line-height: 1.8;
    color: var(--text);
    background: var(--bg);
    border: none;
    padding: 14px 16px;
    resize: vertical;
    min-height: 110px;
    max-height: 200px;
    outline: none;
    width: 100%;
    word-break: break-all;
  }

  #raw-input::placeholder { color: var(--muted); }

  /* ── STATUS BAR ── */
  .status-bar {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 6px 16px;
    background: var(--panel);
    border-top: 1px solid var(--border);
    font-size: 11px;
    font-family: var(--mono);
    color: var(--muted);
    flex-wrap: wrap;
  }

  .status-item { display: flex; align-items: center; gap: 5px; }
  .status-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--muted); }
  .status-dot.ok { background: var(--green); }
  .status-dot.err { background: var(--red); }

  /* ── GOOGLE ADS SLOT – SIDEBAR / INLINE ── */
  .ad-inline {
    background: var(--surface);
    border: 1px dashed var(--border2);
    border-radius: 6px;
    height: 90px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--muted);
    font-size: 11px;
    /* Replace contents with <ins class="adsbygoogle"> block */
  }

  /* ── FOOTER ── */
  footer {
    padding: 12px 0;
    border-top: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 11px;
    color: var(--muted);
    flex-wrap: wrap;
    gap: 8px;
  }

  footer a { color: var(--muted); text-decoration: none; }
  footer a:hover { color: var(--accent); }

  /* ── TOOLTIP ── */
  [data-tip] { position: relative; }
  [data-tip]:hover::after {
    content: attr(data-tip);
    position: absolute;
    bottom: calc(100% + 4px);
    left: 50%;
    transform: translateX(-50%);
    background: var(--border2);
    color: var(--text);
    font-size: 10px;
    font-family: var(--mono);
    padding: 3px 7px;
    border-radius: 4px;
    white-space: nowrap;
    pointer-events: none;
    z-index: 100;
  }

  /* ── NOTIFICATIONS ── */
  #toast {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: var(--panel);
    border: 1px solid var(--border2);
    border-left: 3px solid var(--green);
    border-radius: 6px;
    padding: 10px 16px;
    font-size: 12px;
    font-family: var(--mono);
    color: var(--text);
    opacity: 0;
    transform: translateY(10px);
    transition: all 0.2s;
    pointer-events: none;
    z-index: 999;
  }
  #toast.show { opacity: 1; transform: translateY(0); }
  #toast.err { border-left-color: var(--red); }

  /* ── COLUMN HEADERS ── */
  .tree-col-headers {
    display: grid;
    grid-template-columns: 70px 220px 1fr auto;
    padding: 4px 16px;
    background: var(--panel);
    border-bottom: 1px solid var(--border);
    font-size: 10px;
    font-family: var(--mono);
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--muted);
  }

  /* ── RESPONSIVE ── */
  @media (max-width: 700px) {
    .field-row { grid-template-columns: 55px 150px 1fr auto; }
    .tree-col-headers { grid-template-columns: 55px 150px 1fr auto; }
  }

  /* ── SCROLLBAR ── */
  * { scrollbar-width: thin; scrollbar-color: var(--border2) transparent; }