:root {
    --bg: #0a0c0f;
    --surface: #111418;
    --surface2: #161b22;
    --border: #21262d;
    --border2: #30363d;
    --accent: #f78166;
    --accent2: #d29922;
    --accent3: #3fb950;
    --accent4: #58a6ff;
    --text: #e6edf3;
    --text2: #8b949e;
    --text3: #6e7681;
    --danger: #f85149;
    --warn: #d29922;
    --mono: 'JetBrains Mono', monospace;
    --sans: 'Syne', sans-serif;
  }

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

  body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--mono);
    font-size: 13px;
    min-height: 100vh;
    overflow-x: hidden;
  }

  /* ── SCANLINE EFFECT ── */
  body::before {
    content: '';
    position: fixed;
    inset: 0;
    background: repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(0,0,0,.03) 2px, rgba(0,0,0,.03) 4px);
    pointer-events: none;
    z-index: 9999;
  }

  /* ── LOGIN ── */
  #login-view {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: radial-gradient(ellipse at 50% 30%, #1a0a00 0%, var(--bg) 70%);
  }

  .login-box {
    width: 380px;
    padding: 40px;
    background: var(--surface);
    border: 1px solid var(--border2);
    position: relative;
    overflow: hidden;
  }

  .login-box::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent), var(--accent2), transparent);
  }

  .login-logo {
    font-family: var(--sans);
    font-size: 22px;
    font-weight: 800;
    color: var(--accent);
    letter-spacing: -0.5px;
    margin-bottom: 4px;
  }

  .login-sub {
    color: var(--text3);
    font-size: 11px;
    margin-bottom: 32px;
    letter-spacing: 0.05em;
    text-transform: uppercase;
  }

  label {
    display: block;
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text3);
    margin-bottom: 6px;
  }

  input[type=text], input[type=password], input[type=email], input[type=number], select, textarea {
    width: 100%;
    background: var(--bg);
    border: 1px solid var(--border2);
    color: var(--text);
    font-family: var(--mono);
    font-size: 13px;
    padding: 10px 12px;
    outline: none;
    transition: border-color .2s;
  }

  input:focus, select:focus, textarea:focus { border-color: var(--accent); }
  textarea { resize: vertical; min-height: 80px; }
  select option { background: var(--surface2); }

  .form-group { margin-bottom: 18px; }

  .btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    font-family: var(--mono);
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    cursor: pointer;
    border: none;
    transition: all .15s;
    text-decoration: none;
  }

  .btn-primary { background: var(--accent); color: #fff; }
  .btn-primary:hover { background: #ff9680; }
  .btn-secondary { background: transparent; color: var(--text2); border: 1px solid var(--border2); }
  .btn-secondary:hover { border-color: var(--text2); color: var(--text); }
  .btn-success { background: var(--accent3); color: #000; }
  .btn-success:hover { background: #56d364; }
  .btn-danger { background: var(--danger); color: #fff; }
  .btn-danger:hover { background: #ff6b63; }
  .btn-warn { background: var(--accent2); color: #000; }
  .btn-sm { padding: 6px 12px; font-size: 11px; }
  .btn-full { width: 100%; justify-content: center; }
  .btn:disabled { opacity: .5; cursor: not-allowed; }

  /* ── APP LAYOUT ── */
  #app-view { display: none; min-height: 100vh; }

  .topbar {
    display: flex;
    align-items: center;
    padding: 0 24px;
    height: 52px;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
  }

  .topbar-logo {
    font-family: var(--sans);
    font-size: 16px;
    font-weight: 800;
    color: var(--accent);
    letter-spacing: -0.3px;
    margin-right: 32px;
    flex-shrink: 0;
  }

  .topbar-nav { display: flex; gap: 2px; flex: 1; }

  .nav-btn {
    padding: 6px 14px;
    background: none;
    border: none;
    color: var(--text3);
    font-family: var(--mono);
    font-size: 11px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    cursor: pointer;
    transition: all .15s;
    position: relative;
  }

  .nav-btn:hover { color: var(--text); }
  .nav-btn.active { color: var(--accent); }
  .nav-btn.active::after {
    content: '';
    position: absolute;
    bottom: -1px; left: 0; right: 0;
    height: 2px;
    background: var(--accent);
  }

  .topbar-right {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-left: auto;
  }

  .wallet-badge {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 4px 12px;
    background: var(--bg);
    border: 1px solid var(--border2);
    font-size: 12px;
    color: var(--accent2);
    font-weight: 600;
  }

  .username-label { color: var(--text3); font-size: 11px; }

  /* ── MAIN CONTENT ── */
  .page { display: none; padding: 28px 28px; max-width: 1400px; margin: 0 auto; }
  .page.active { display: block; }

  .page-header {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
  }

  .page-title {
    font-family: var(--sans);
    font-size: 20px;
    font-weight: 700;
    color: var(--text);
  }

  .page-subtitle { color: var(--text3); font-size: 11px; margin-top: 4px; }

  /* ── CARDS ── */
  .card {
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 20px;
    margin-bottom: 16px;
    position: relative;
  }

  .card-title {
    font-family: var(--sans);
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--text3);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
  }

  .card-title .dot {
    width: 6px; height: 6px;
    border-radius: 50%;
    background: var(--accent);
    flex-shrink: 0;
  }

  /* ── TABLES ── */
  .table-wrap { overflow-x: auto; }
  table { width: 100%; border-collapse: collapse; }
  th {
    text-align: left;
    padding: 8px 12px;
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text3);
    border-bottom: 1px solid var(--border2);
    white-space: nowrap;
  }
  td {
    padding: 10px 12px;
    border-bottom: 1px solid var(--border);
    color: var(--text2);
    font-size: 12px;
    vertical-align: top;
  }
  tr:hover td { background: var(--surface2); color: var(--text); }
  tr:last-child td { border-bottom: none; }
  .td-mono { font-family: var(--mono); color: var(--accent2); }

  /* ── BADGES ── */
  .badge {
    display: inline-block;
    padding: 2px 8px;
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
  }

  .badge-green { background: rgba(63,185,80,.15); color: var(--accent3); border: 1px solid rgba(63,185,80,.3); }
  .badge-red { background: rgba(248,81,73,.15); color: var(--danger); border: 1px solid rgba(248,81,73,.3); }
  .badge-yellow { background: rgba(210,153,34,.15); color: var(--accent2); border: 1px solid rgba(210,153,34,.3); }
  .badge-blue { background: rgba(88,166,255,.15); color: var(--accent4); border: 1px solid rgba(88,166,255,.3); }

  /* ── UPLOAD AREA ── */
  .upload-zone {
    border: 2px dashed var(--border2);
    padding: 48px;
    text-align: center;
    transition: all .2s;
    cursor: pointer;
    position: relative;
  }

  .upload-zone:hover, .upload-zone.drag-over {
    border-color: var(--accent);
    background: rgba(247,129,102,.05);
  }

  .upload-zone input[type=file] {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
    width: 100%;
  }

  .upload-icon { font-size: 36px; margin-bottom: 12px; }
  .upload-text { font-size: 14px; color: var(--text2); margin-bottom: 4px; }
  .upload-hint { font-size: 11px; color: var(--text3); }

  /* ── RESULTS ── */
  .result-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 12px;
    margin-bottom: 20px;
  }

  .result-kv {
    background: var(--bg);
    border: 1px solid var(--border);
    padding: 12px;
  }

  .result-k { font-size: 10px; color: var(--text3); text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 4px; }
  .result-v { font-size: 13px; color: var(--text); word-break: break-all; }
  .result-v.mono { font-family: var(--mono); color: var(--accent2); }
  .result-v.good { color: var(--accent3); }
  .result-v.bad { color: var(--danger); }

  /* ── STATS ROW ── */
  .stats-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-bottom: 24px; }

  .stat-card {
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 18px 20px;
    position: relative;
    overflow: hidden;
  }

  .stat-card::before {
    content: '';
    position: absolute;
    bottom: 0; left: 0; right: 0;
    height: 2px;
    background: var(--accent);
    opacity: .4;
  }

  .stat-num {
    font-family: var(--sans);
    font-size: 28px;
    font-weight: 800;
    color: var(--text);
    line-height: 1;
    margin-bottom: 4px;
  }

  .stat-label { font-size: 10px; color: var(--text3); text-transform: uppercase; letter-spacing: 0.1em; }

  /* ── TABS ── */
  .tab-bar { display: flex; gap: 0; border-bottom: 1px solid var(--border); margin-bottom: 20px; }
  .tab-btn {
    padding: 10px 20px;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--text3);
    font-family: var(--mono);
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    cursor: pointer;
    transition: all .15s;
    margin-bottom: -1px;
  }
  .tab-btn:hover { color: var(--text2); }
  .tab-btn.active { color: var(--accent); border-bottom-color: var(--accent); }
  .tab-panel { display: none; }
  .tab-panel.active { display: block; }

  /* ── MODAL ── */
  .modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,.7);
    z-index: 200;
    align-items: center;
    justify-content: center;
  }

  .modal-overlay.open { display: flex; }
  .modal {
    background: var(--surface);
    border: 1px solid var(--border2);
    width: 560px;
    max-width: 95vw;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
  }

  .modal-header {
    padding: 20px 24px 16px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    background: var(--surface);
  }

  .modal-title { font-family: var(--sans); font-size: 15px; font-weight: 700; }
  .modal-close { background: none; border: none; color: var(--text3); font-size: 20px; cursor: pointer; padding: 0 4px; }
  .modal-close:hover { color: var(--text); }
  .modal-body { padding: 24px; }
  .modal-footer { padding: 16px 24px; border-top: 1px solid var(--border); display: flex; justify-content: flex-end; gap: 10px; }

  /* ── UPLOAD HISTORY ── */
  .upload-card {
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 16px 20px;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 16px;
    cursor: pointer;
    transition: border-color .15s;
  }

  .upload-card:hover { border-color: var(--accent); }

  .upload-card-icon { font-size: 20px; flex-shrink: 0; }
  .upload-card-body { flex: 1; min-width: 0; }
  .upload-card-name { font-weight: 600; color: var(--text); margin-bottom: 2px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
  .upload-card-meta { font-size: 11px; color: var(--text3); }
  .upload-card-badge { flex-shrink: 0; }

  /* ── HEX VIEWER ── */
  .hex-view {
    font-family: var(--mono);
    font-size: 11px;
    line-height: 1.8;
    color: var(--text3);
    background: var(--bg);
    padding: 16px;
    border: 1px solid var(--border);
    overflow-x: auto;
    white-space: pre;
    max-height: 300px;
    overflow-y: auto;
  }

  .hex-view .hex-byte { color: var(--text2); }
  .hex-view .hex-highlight { color: var(--accent); font-weight: 700; }

  /* ── ALERTS ── */
  .alert {
    padding: 12px 16px;
    margin-bottom: 16px;
    font-size: 12px;
    border-left: 3px solid;
  }

  .alert-error { background: rgba(248,81,73,.1); border-color: var(--danger); color: #ffa09b; }
  .alert-success { background: rgba(63,185,80,.1); border-color: var(--accent3); color: #82e89a; }
  .alert-info { background: rgba(88,166,255,.1); border-color: var(--accent4); color: #a5c8ff; }
  .alert-warn { background: rgba(210,153,34,.1); border-color: var(--accent2); color: #e8c56a; }

  /* ── XML VIEW ── */
  pre.xml-view {
    font-family: var(--mono);
    font-size: 11px;
    background: var(--bg);
    border: 1px solid var(--border);
    padding: 16px;
    overflow: auto;
    max-height: 400px;
    color: var(--text3);
    white-space: pre-wrap;
    word-break: break-all;
  }

  /* ── PROGRESS ── */
  .progress { display: flex; align-items: center; gap: 12px; }
  .progress-bar { flex: 1; height: 4px; background: var(--border2); overflow: hidden; }
  .progress-fill { height: 100%; background: var(--accent); transition: width .3s; }

  /* ── MISC ── */
  .empty-state { text-align: center; padding: 60px 20px; color: var(--text3); }
  .empty-state .icon { font-size: 40px; margin-bottom: 12px; }
  .empty-state .text { font-size: 13px; }

  .search-bar {
    display: flex;
    gap: 10px;
    margin-bottom: 16px;
  }

  .search-bar input { flex: 1; }

  .text-danger { color: var(--danger); }
  .text-success { color: var(--accent3); }
  .text-warn { color: var(--accent2); }
  .text-muted { color: var(--text3); }

  .divider { border: none; border-top: 1px solid var(--border); margin: 20px 0; }

  .inline-grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }


  /* ── TREE LAUNCHER ── */
  .tree-card {
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 20px;
    cursor: pointer;
    transition: all .15s;
  }
  .tree-card:hover { border-color: var(--accent4); transform: translateY(-2px); }
  .tree-card-soon { opacity: .4; cursor: not-allowed; }
  .tree-card-soon:hover { border-color: var(--border); transform: none; }
  .tree-card-icon { font-size: 28px; margin-bottom: 10px; }
  .tree-card-title { font-family: var(--sans); font-size: 15px; font-weight: 700; color: var(--text); margin-bottom: 6px; }
  .tree-card-sub { font-size: 12px; color: var(--text3); line-height: 1.5; }

  .tree-breadcrumb { display: flex; align-items: center; gap: 8px; margin-bottom: 20px; padding: 10px 14px; background: var(--surface); border: 1px solid var(--border); }
  .tree-crumb { font-size: 12px; color: var(--accent4); cursor: pointer; font-family: var(--mono); }
  .tree-crumb:hover { text-decoration: underline; }
  .tree-sep { color: var(--text3); font-size: 12px; }

  .tool-card { background: var(--surface); border: 1px solid var(--border); padding: 0; overflow: hidden; }
  .tool-card-header { padding: 16px 18px 12px; border-bottom: 1px solid var(--border); }
  .tool-card-title { font-family: var(--sans); font-size: 15px; font-weight: 700; color: var(--text); margin-top: 8px; }
  .tool-card-body { padding: 14px 18px; font-size: 13px; color: var(--text2); line-height: 1.7; }
  .tool-card-equipment { padding: 10px 18px 0; }
  .tool-card > .btn { margin: 0 18px 16px; }

  .tool-badge { display: inline-block; font-size: 10px; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; padding: 3px 8px; }
  .tool-badge-serial { background: rgba(88,166,255,.15); color: var(--accent4); border: 1px solid rgba(88,166,255,.3); }
  .tool-badge-chip { background: rgba(210,153,34,.15); color: var(--accent2); border: 1px solid rgba(210,153,34,.3); }
  .tool-badge-bus { background: rgba(63,185,80,.15); color: var(--accent3); border: 1px solid rgba(63,185,80,.3); }

  .equip-label { font-size: 10px; text-transform: uppercase; letter-spacing: .1em; color: var(--text3); font-family: var(--mono); margin-bottom: 6px; }
  .equip-item { font-size: 12px; color: var(--text2); padding: 2px 0; }

  @media (max-width: 700px) {
    .stats-row { grid-template-columns: 1fr 1fr; }
    .inline-grid-2 { grid-template-columns: 1fr; }
    .topbar-nav .nav-btn { padding: 6px 8px; font-size: 10px; }
  }