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

  :root {
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f4;
    --bg-tertiary: #ebebea;
    --bg-success: #EAF3DE;
    --bg-warning: #FAEEDA;
    --bg-danger:  #FCEBEB;
    --bg-info:    #E6F1FB;
    --text-primary:   #1a1a18;
    --text-secondary: #5F5E5A;
    --text-success:   #3B6D11;
    --text-warning:   #854F0B;
    --text-danger:    #A32D2D;
    --text-info:      #185FA5;
    --border-light:   rgba(0,0,0,0.12);
    --border-medium:  rgba(0,0,0,0.22);
    --radius-md: 8px;
    --radius-lg: 12px;
    --font-sans: system-ui, -apple-system, sans-serif;
    --font-mono: 'Menlo', 'Consolas', monospace;
  }

  @media (prefers-color-scheme: dark) {
    :root {
      --bg-primary:   #1e1e1c;
      --bg-secondary: #2a2a28;
      --bg-tertiary:  #333331;
      --bg-success:   #173404;
      --bg-warning:   #412402;
      --bg-danger:    #501313;
      --bg-info:      #042C53;
      --text-primary:   #e8e8e4;
      --text-secondary: #B4B2A9;
      --text-success:   #C0DD97;
      --text-warning:   #FAC775;
      --text-danger:    #F7C1C1;
      --text-info:      #B5D4F4;
      --border-light:  rgba(255,255,255,0.10);
      --border-medium: rgba(255,255,255,0.20);
    }
  }

  body {
    font-family: var(--font-sans);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    padding: 1.5rem;
    min-height: 100vh;
  }

  h1 { font-size: 22px; font-weight: 500; }
  h2 { font-size: 18px; font-weight: 500; }
  h3 { font-size: 16px; font-weight: 500; }

  .container { max-width: 780px; margin: 0 auto; }

  .panel {
    background: var(--bg-primary);
    border: 0.5px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: 1rem 1.25rem;
    margin-bottom: 12px;
  }

  .panel-title {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: .05em;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
  }

  .grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
  .grid3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 10px; }

  .metric {
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: .75rem 1rem;
  }
  .metric-label  { font-size: 12px; color: var(--text-secondary); margin-bottom: 4px; }
  .metric-value  { font-size: 20px; font-weight: 500; color: var(--text-primary); }
  .metric-unit   { font-size: 12px; color: var(--text-secondary); margin-left: 3px; }

  .badge         { display: inline-block; padding: 2px 10px; border-radius: var(--radius-md); font-size: 12px; font-weight: 500; }
  .badge-on      { background: var(--bg-success);  color: var(--text-success); }
  .badge-off     { background: var(--bg-secondary); color: var(--text-secondary); }

  .row           { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; }
  .row label     { font-size: 13px; color: var(--text-secondary); min-width: 160px; }
  .row input[type=range] { flex: 1; cursor: pointer; }
  .row .val      { font-size: 13px; font-weight: 500; min-width: 60px; text-align: right; color: var(--text-primary); }

  input[type=text],
  input[type=number],
  select {
    font-family: var(--font-sans);
    font-size: 13px;
    width: 100%;
    padding: 7px 10px;
    border-radius: var(--radius-md);
    border: 0.5px solid var(--border-medium);
    background: var(--bg-primary);
    color: var(--text-primary);
    outline: none;
  }
  input:focus, select:focus { box-shadow: 0 0 0 2px var(--text-info); }

  .rds-row  { display: grid; grid-template-columns: 130px 1fr; gap: 8px; align-items: center; margin-bottom: 8px; }
  .rds-label { font-size: 12px; color: var(--text-secondary); }

  .spectrum {
    width: 100%; height: 90px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    overflow: hidden;
  }

  .vu-wrap  { background: var(--bg-secondary); border-radius: var(--radius-md); padding: 8px 10px; margin-bottom: 6px; }
  .vu-label { font-size: 11px; color: var(--text-secondary); margin-bottom: 3px; }
  .vu-bar   {
    height: 18px; border-radius: 3px;
    background: linear-gradient(90deg, #1D9E75, #EF9F27, #E24B4A);
    transition: width .08s;
    width: 0%;
  }

  .tx-status {
    display: flex; align-items: center; gap: 8px;
    padding: .5rem .75rem;
    border-radius: var(--radius-md);
    border: 0.5px solid var(--border-light);
    background: var(--bg-secondary);
    margin-bottom: 8px;
    flex-wrap: wrap;
  }

  .dot         { width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }
  .dot-green   { background: #1D9E75; box-shadow: 0 0 6px #1D9E7599; }
  .dot-red     { background: #E24B4A; }
  .dot-yellow  { background: #EF9F27; box-shadow: 0 0 6px #EF9F2799; }

  .btn {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 8px 18px;
    border-radius: var(--radius-md);
    border: 0.5px solid var(--border-medium);
    background: transparent;
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 13px; font-weight: 500;
    cursor: pointer;
    transition: background .15s, opacity .15s;
  }
  .btn:hover          { background: var(--bg-secondary); }
  .btn-primary        { background: var(--bg-info); border-color: #185FA5; color: var(--text-info); }
  .btn-primary:hover  { opacity: .85; }
  .btn-danger         { background: var(--bg-danger); border-color: #A32D2D; color: var(--text-danger); }
  .btn-danger:hover   { opacity: .85; }

  .sep { border: none; border-top: 0.5px solid var(--border-light); margin: 10px 0; }

  canvas { display: block; width: 100%; height: 100%; }

  .header-row {
    display: flex; align-items: center;
    justify-content: space-between;
    margin-bottom: 14px;
    flex-wrap: wrap; gap: 8px;
  }

  .action-row {
    display: flex; gap: 10px;
    flex-wrap: wrap; margin-top: 4px;
  }

  @media (max-width: 520px) {
    .grid2, .grid3 { grid-template-columns: 1fr; }
    .row label { min-width: 120px; }
  }