:root {
    --bg: #0f1419; --panel: #1a2027; --panel2: #222b34;
    --ink: #e6edf3; --muted: #9aa7b2; --accent: #4cc2ff;
    --grid: #3a4651; --lobe: #4cc2ff; --line: #2b343d; --hot: #ff7a59;
  }
  * { box-sizing: border-box; }
  body {
    margin: 0; background: var(--bg); color: var(--ink);
    font: 16px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  }
  .wrap { max-width: 980px; margin: 0 auto; padding: 24px 18px 64px; }
  h1 { font-size: 1.6rem; margin: 0 0 4px; }
  .sub { color: var(--muted); margin: 0 0 24px; }
  form { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 20px; }
  fieldset { border: none; padding: 0; margin: 0 0 20px; }
  legend { font-weight: 600; margin-bottom: 10px; padding: 0; }
  .types { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 10px; }
  .types label {
    display: block; background: var(--panel2); border: 1px solid var(--line);
    border-radius: 10px; padding: 12px 14px; cursor: pointer; transition: border-color .15s;
  }
  .types label:hover { border-color: var(--accent); }
  .types input { margin-right: 8px; }
  .types .nm { font-weight: 600; }
  .types .bl { color: var(--muted); font-size: .85rem; margin-top: 4px; }
  .tag { font-size: .65rem; font-weight: 700; letter-spacing: .05em; background: var(--hot);
         color: #2a0f06; padding: 2px 6px; border-radius: 5px; vertical-align: middle; }
  .warn { background: rgba(255,122,89,.12); border: 1px solid var(--hot); color: var(--hot);
          border-radius: 8px; padding: 8px 12px; font-size: .85rem; margin: 0 0 12px; }
  .eff { display: inline-block; border-radius: 8px; padding: 6px 11px; font-size: .85rem;
         font-weight: 600; margin: 0 0 12px; }
  .eff-bad  { background: rgba(255,90,90,.15);  border: 1px solid #ff5a5a; color: #ff8d8d; }
  .eff-warn { background: rgba(255,122,89,.14); border: 1px solid var(--hot); color: var(--hot); }
  .eff-ok   { background: rgba(76,194,255,.14); border: 1px solid var(--accent); color: var(--accent); }
  .eff-good { background: rgba(90,220,140,.15); border: 1px solid #5adc8c; color: #7ce6a6; }
  .rwsummary { margin-top: 28px; background: linear-gradient(180deg, var(--panel2), var(--panel));
               border: 1px solid var(--accent); border-radius: 14px; padding: 22px 24px; text-align: center; }
  .rwlen { font-size: 2.4rem; font-weight: 800; color: var(--accent); line-height: 1.1; }
  .rwft { font-size: 1.2rem; font-weight: 600; color: var(--muted); }
  .rwlabel { text-transform: uppercase; letter-spacing: .08em; font-size: .75rem; color: var(--muted); margin-top: 2px; }
  .rwexp { max-width: 620px; margin: 14px auto 0; color: var(--ink); }
  .rwalt { color: var(--muted); font-size: .85rem; margin: 8px 0 0; }
  .bands { display: flex; flex-wrap: wrap; gap: 8px; }
  .bands label {
    background: var(--panel2); border: 1px solid var(--line); border-radius: 999px;
    padding: 7px 14px; cursor: pointer; user-select: none;
  }
  .bands input { margin-right: 6px; }
  .bands label:hover { border-color: var(--accent); }
  .linkbtn { background: none; border: none; color: var(--accent); cursor: pointer;
             font-size: .8rem; font-weight: 600; padding: 0; margin-left: 8px; text-decoration: underline; }
  .linkbtn:hover { filter: brightness(1.15); }
  button {
    background: var(--accent); color: #04263a; border: none; border-radius: 10px;
    padding: 12px 22px; font-size: 1rem; font-weight: 700; cursor: pointer;
  }
  button:hover { filter: brightness(1.08); }
  .results { margin-top: 32px; display: grid; gap: 20px; }
  .card {
    background: var(--panel); border: 1px solid var(--line); border-radius: 12px;
    padding: 20px; display: grid; grid-template-columns: 1fr 340px; gap: 20px;
  }
  @media (max-width: 760px) { .card { grid-template-columns: 1fr; } }
  .selects { display: flex; flex-wrap: wrap; gap: 18px; margin-bottom: 20px; }
  .selects label { display: flex; flex-direction: column; gap: 6px; font-weight: 600; }
  .selects select {
    background: var(--panel2); color: var(--ink); border: 1px solid var(--line);
    border-radius: 8px; padding: 9px 12px; font-size: .95rem; min-width: 180px;
  }
  .gainbar {
    display: flex; gap: 18px; flex-wrap: wrap; align-items: baseline;
    background: var(--panel2); border-radius: 10px; padding: 12px 14px; margin-bottom: 12px;
  }
  .gainbar .big { font-size: 1.5rem; font-weight: 800; color: var(--accent); }
  .gainbar .sm { color: var(--muted); font-size: .85rem; }
  .gainbar .hot { color: var(--hot); font-weight: 700; }
  .card h2 { margin: 0 0 2px; font-size: 1.25rem; }
  .card .freq { color: var(--muted); margin: 0 0 14px; font-size: .9rem; }
  table { width: 100%; border-collapse: collapse; margin-bottom: 14px; }
  td { padding: 7px 0; border-bottom: 1px solid var(--line); vertical-align: top; }
  td.lbl { color: var(--muted); padding-right: 12px; }
  td.val { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
  .val b { color: var(--accent); }
  .height, .feed { background: var(--panel2); border-radius: 10px; padding: 12px 14px; margin-bottom: 12px; }
  .height .h, .feed .h { font-weight: 600; margin-bottom: 6px; }
  .feed { border-left: 3px solid var(--hot); }
  .feed .feeddev { font-size: 1.1rem; font-weight: 700; color: var(--hot); }
  .feed .sm { color: var(--muted); font-size: .85rem; margin-top: 2px; }
  .note { color: var(--muted); font-size: .88rem; margin: 6px 0 0; }
  ul.notes { margin: 8px 0 0; padding-left: 18px; color: var(--muted); font-size: .88rem; }
  ul.notes li { margin: 4px 0; }
  .azwrap { text-align: center; }
  .pattern { width: 100%; max-width: 340px; height: auto; display: block; margin: 0 auto; }
  .azcap { color: var(--muted); font-size: .8rem; margin: 4px 0 16px; }
  .empty { color: var(--muted); margin-top: 24px; }
  .ref { margin-top: 32px; background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 14px 18px; }
  .ref summary { cursor: pointer; font-weight: 600; }
  .reftbl { width: 100%; border-collapse: collapse; margin-top: 12px; font-size: .9rem; }
  .reftbl th, .reftbl td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
  .reftbl th { color: var(--muted); font-weight: 600; }
  .reftbl td:first-child { color: var(--accent); font-weight: 600; white-space: nowrap; }
  footer { color: var(--muted); font-size: .8rem; margin-top: 40px; }
  .topnav { margin-bottom: 18px; font-size: .9rem; }
  .topnav a { color: var(--accent); text-decoration: none; font-weight: 600; }
  .topnav a:hover { text-decoration: underline; }
  .topnav .here { color: var(--ink); cursor: default; }
  .topnav .here:hover { text-decoration: none; }
  .lead { color: var(--muted); max-width: 680px; }
  .rule { background: linear-gradient(180deg,var(--panel2),var(--panel)); border: 1px solid var(--accent);
          border-radius: 14px; padding: 18px 22px; margin: 22px 0; }
  .rule .eq { font-size: 1.4rem; font-weight: 800; color: var(--accent); text-align: center; margin: 4px 0 14px; }
  .deriv { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .88rem; color: var(--ink);
           background: var(--bg); border-radius: 8px; padding: 12px 14px; line-height: 1.7; overflow-x: auto;
           white-space: pre; }
  .deriv .c { color: var(--muted); }
  h2.sec { margin: 34px 0 6px; font-size: 1.3rem; }
  .device { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 18px 20px; margin: 14px 0; }
  .device h3 { margin: 0 0 4px; font-size: 1.15rem; }
  .device h3 .ratio { color: var(--accent); }
  .device .turns { color: var(--hot); font-weight: 600; font-size: .9rem; margin-bottom: 8px; }
  .device ul { margin: 8px 0 0; padding-left: 18px; }
  .device ol { margin: 8px 0 0; padding-left: 20px; }
  .device li { margin: 6px 0; }
  .hextbl td:first-child { color: var(--accent); font-weight: 700; }
  .hextbl td { font-variant-numeric: tabular-nums; }
  .device .winding { font-family: ui-monospace, monospace; font-size: .85rem; color: var(--ink); background: var(--bg);
                     padding: 1px 5px; border-radius: 4px; }
  .example { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 16px; }
  @media (max-width: 640px) { .example { grid-template-columns: 1fr; } }
  .ex { background: var(--bg); border: 1px solid var(--line); border-radius: 10px; padding: 14px 16px; }
  .ex h4 { margin: 0 0 8px; font-size: .98rem; color: var(--accent); }
  .calc { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .86rem; line-height: 1.9; color: var(--ink); }
  .calc .r { color: var(--hot); font-weight: 700; }
  .calc .c { color: var(--muted); }
  .diagram { text-align: center; margin: 16px 0 4px; }
  .diagram svg { width: 100%; max-width: 540px; height: auto; background: var(--panel2); border-radius: 10px; padding: 8px; }
  .diagram .cap { color: var(--muted); font-size: .82rem; margin-top: 6px; max-width: 540px; margin-left: auto; margin-right: auto; }