.btcWrap {
    --btcPrimary: #164e63;
    --btcPrimaryDark: #0f3442;
    --btcAccent: #22c55e;
    --btcAccentSoft: #dcfce7;
    --btcSky: #e0f2fe;
    --btcText: #172033;
    --btcMuted: #667085;
    --btcBorder: #dbe5ea;
    --btcCard: #ffffff;
    --btcBg: #f6fbfd;
    --btcDanger: #dc2626;
    max-width: 1100px;
    margin: 30px auto;
    padding: 24px;
    font-family: Arial, Helvetica, sans-serif;
    color: var(--btcText);
    background:
      radial-gradient(circle at top left, rgba(34, 197, 94, 0.14), transparent 32%),
      linear-gradient(135deg, #f8feff 0%, #eef9fb 100%);
    border: 1px solid var(--btcBorder);
    border-radius: 24px;
    box-shadow: 0 20px 55px rgba(15, 52, 66, 0.08);
  }

  .btcWrap * {
    box-sizing: border-box;
  }

  .btcHero {
    text-align: center;
    max-width: 760px;
    margin: 0 auto 24px;
  }

  .btcBadge {
    display: inline-flex;
    padding: 8px 14px;
    border-radius: 999px;
    background: var(--btcAccentSoft);
    color: #166534;
    font-size: 13px;
    font-weight: 700;
    margin-bottom: 12px;
  }

  .btcHero h2 {
    margin: 0 0 10px;
    font-size: clamp(28px, 4vw, 44px);
    line-height: 1.1;
    color: var(--btcPrimaryDark);
  }

  .btcHero p {
    margin: 0;
    color: var(--btcMuted);
    font-size: 16px;
    line-height: 1.7;
  }

  .btcTool {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 20px;
    align-items: stretch;
  }

  .btcCard {
    background: var(--btcCard);
    border: 1px solid var(--btcBorder);
    border-radius: 22px;
    padding: 22px;
    box-shadow: 0 12px 35px rgba(15, 52, 66, 0.07);
  }

  .btcCardHead h3 {
    margin: 0 0 6px;
    font-size: 22px;
    color: var(--btcPrimaryDark);
  }

  .btcCardHead p {
    margin: 0 0 18px;
    color: var(--btcMuted);
    line-height: 1.6;
  }

  .btcUnitBox {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-bottom: 18px;
    padding: 6px;
    border-radius: 16px;
    background: var(--btcBg);
    border: 1px solid var(--btcBorder);
  }

  .btcUnitBox label {
    cursor: pointer;
  }

  .btcUnitBox input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
  }

  .btcUnitBox span {
    display: block;
    text-align: center;
    padding: 12px 10px;
    border-radius: 12px;
    color: var(--btcMuted);
    font-weight: 700;
    transition: 0.2s ease;
  }

  .btcUnitBox input:checked + span {
    background: var(--btcPrimary);
    color: #ffffff;
    box-shadow: 0 8px 18px rgba(22, 78, 99, 0.22);
  }

  .btcGrid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
  }

  .btcField {
    display: block;
  }

  .btcField span {
    display: block;
    margin-bottom: 7px;
    font-weight: 800;
    color: var(--btcPrimaryDark);
  }

  .btcField input {
    width: 100%;
    border: 1px solid var(--btcBorder);
    border-radius: 14px;
    padding: 14px 14px;
    font-size: 16px;
    color: var(--btcText);
    outline: none;
    background: #ffffff;
    transition: 0.2s ease;
  }

  .btcField input:focus {
    border-color: var(--btcPrimary);
    box-shadow: 0 0 0 4px rgba(22, 78, 99, 0.1);
  }

  .btcField small {
    display: block;
    margin-top: 7px;
    color: var(--btcMuted);
    font-size: 12px;
    line-height: 1.4;
  }

  .btcActions {
    display: flex;
    gap: 10px;
    margin-top: 20px;
    flex-wrap: wrap;
  }

  .btcBtn {
    border: 0;
    border-radius: 14px;
    padding: 13px 18px;
    font-weight: 800;
    cursor: pointer;
    transition: 0.2s ease;
    font-size: 15px;
  }

  .btcBtnMain {
    background: linear-gradient(135deg, var(--btcPrimary), var(--btcPrimaryDark));
    color: #ffffff;
    flex: 1;
  }

  .btcBtnMain:hover {
    transform: translateY(-1px);
    box-shadow: 0 12px 22px rgba(22, 78, 99, 0.22);
  }

  .btcBtnLight {
    background: var(--btcSky);
    color: var(--btcPrimaryDark);
  }

  .btcBtnCopy {
    width: 100%;
    margin-top: 16px;
    background: var(--btcAccent);
    color: #052e16;
  }

  .btcError {
    margin: 12px 0 0;
    color: var(--btcDanger);
    font-weight: 700;
    line-height: 1.5;
  }

  .btcResultCard {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 430px;
    background:
      linear-gradient(180deg, #ffffff 0%, #f8feff 100%);
  }

  .btcPlaceholder {
    text-align: center;
    max-width: 340px;
  }

  .btcCircleIcon {
    width: 72px;
    height: 72px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    margin: 0 auto 14px;
    background: var(--btcSky);
    color: var(--btcPrimary);
    font-size: 34px;
    font-weight: 900;
  }

  .btcPlaceholder h3 {
    margin: 0 0 8px;
    color: var(--btcPrimaryDark);
  }

  .btcPlaceholder p {
    margin: 0;
    color: var(--btcMuted);
    line-height: 1.6;
  }

  .btcResultContent {
    width: 100%;
  }

  .btcResultLabel {
    display: inline-flex;
    padding: 7px 12px;
    border-radius: 999px;
    background: var(--btcAccentSoft);
    color: #166534;
    font-weight: 800;
    font-size: 12px;
    margin-bottom: 10px;
  }

  .btcResultContent h3 {
    margin: 0 0 8px;
    font-size: 32px;
    color: var(--btcPrimaryDark);
  }

  .btcResultContent p {
    margin: 0 0 16px;
    color: var(--btcMuted);
    line-height: 1.7;
  }

  .btcStats {
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
    margin: 16px 0;
  }

  .btcStats div {
    padding: 14px;
    border: 1px solid var(--btcBorder);
    border-radius: 16px;
    background: var(--btcBg);
  }

  .btcStats span {
    display: block;
    color: var(--btcMuted);
    font-size: 13px;
    margin-bottom: 5px;
  }

  .btcStats strong {
    font-size: 22px;
    color: var(--btcPrimaryDark);
  }

  .btcBars {
    display: grid;
    gap: 10px;
    margin-top: 14px;
  }

  .btcBarRow {
    display: grid;
    gap: 6px;
  }

  .btcBarTop {
    display: flex;
    justify-content: space-between;
    color: var(--btcText);
    font-weight: 800;
    font-size: 13px;
  }

  .btcBarTrack {
    width: 100%;
    height: 10px;
    background: #eaf1f4;
    border-radius: 999px;
    overflow: hidden;
  }

  .btcBarFill {
    height: 100%;
    width: 0;
    border-radius: 999px;
    background: linear-gradient(90deg, var(--btcPrimary), var(--btcAccent));
    transition: width 0.4s ease;
  }

  .btcInfoGrid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
    margin-top: 18px;
  }

  .btcInfo {
    padding: 18px;
    border-radius: 18px;
    background: rgba(255, 255, 255, 0.72);
    border: 1px solid var(--btcBorder);
  }

  .btcInfo h3 {
    margin: 0 0 8px;
    color: var(--btcPrimaryDark);
    font-size: 18px;
  }

  .btcInfo p {
    margin: 0;
    color: var(--btcMuted);
    line-height: 1.7;
  }

  @media (max-width: 860px) {
    .btcTool,
    .btcInfoGrid {
      grid-template-columns: 1fr;
    }

    .btcResultCard {
      min-height: auto;
    }
  }

  @media (max-width: 560px) {
    .btcWrap {
      padding: 16px;
      border-radius: 18px;
    }

    .btcGrid {
      grid-template-columns: 1fr;
    }

    .btcActions {
      flex-direction: column;
    }

    .btcBtn {
      width: 100%;
    }
  }