#hfc-erc, #hfc-erc * { box-sizing: border-box; }
  #hfc-erc {
    --erc-ink: #1c1b1a;
    --erc-paper: #eff1ec;
    --erc-card: #ffffff;
    --erc-accent: #d7263d;
    --erc-accent-soft: rgba(215,38,61,0.08);
    --erc-line: #d8dad4;
    --erc-muted: #6b6e68;
    --erc-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --erc-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;

    max-width: 560px;
    margin: 2rem auto;
    background: var(--erc-card);
    border: 1px solid var(--erc-line);
    border-radius: 14px;
    overflow: hidden;
    font-family: var(--erc-sans);
    color: var(--erc-ink);
    box-shadow: 0 1px 2px rgba(0,0,0,0.04);
  }

  #hfc-erc .hfc-erc__header {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--erc-ink);
    color: #f4f4f2;
    padding: 18px 20px;
  }
  #hfc-erc .hfc-erc__dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--erc-accent);
    flex-shrink: 0;
    animation: hfc-erc-pulse 2.2s ease-in-out infinite;
  }
  @media (prefers-reduced-motion: reduce) {
    #hfc-erc .hfc-erc__dot { animation: none; }
  }
  @keyframes hfc-erc-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.35; }
  }
  #hfc-erc .hfc-erc__title {
    margin: 0;
    font-size: 1.05rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    color: #f4f4f2 !important;
  }
  #hfc-erc .hfc-erc__tag {
    margin: 2px 0 0;
    font-size: 0.85rem;
    color: #c7c7c3 !important;
  }

  #hfc-erc .hfc-erc__body { padding: 20px; background: var(--erc-paper); }

  #hfc-erc .hfc-erc__label {
    display: block;
    font-size: 0.82rem;
    color: var(--erc-muted) !important;
    margin-bottom: 8px;
    padding: 0;
    border: none;
  }

  #hfc-erc .hfc-erc__followersrow { margin-bottom: 16px; }
  #hfc-erc .hfc-erc__note {
    display: block;
    font-size: 0.76rem;
    color: var(--erc-muted) !important;
    margin-top: 4px;
  }

  #hfc-erc .hfc-erc__number {
    font-family: var(--erc-mono);
    font-size: 0.92rem;
    padding: 9px 10px;
    border: 1px solid var(--erc-line);
    border-radius: 8px;
    background: var(--erc-card);
    color: var(--erc-ink) !important;
    width: 100%;
    max-width: 200px;
  }

  #hfc-erc .hfc-erc__basis { border: none; padding: 0; margin: 0 0 16px; }
  #hfc-erc .hfc-erc__segmented {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
  }
  #hfc-erc .hfc-erc__seg {
    padding: 10px 6px;
    border: 1px solid var(--erc-line);
    border-radius: 9px;
    background: var(--erc-card);
    font-family: var(--erc-sans);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--erc-ink) !important;
    cursor: pointer;
    text-align: center;
  }
  #hfc-erc .hfc-erc__seg.is-active {
    border-color: var(--erc-accent);
    background: var(--erc-accent-soft);
    color: var(--erc-accent) !important;
  }

  #hfc-erc .hfc-erc__rows {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 10px;
  }
  #hfc-erc .hfc-erc__row {
    background: var(--erc-card);
    border: 1px solid var(--erc-line);
    border-radius: 10px;
    padding: 12px;
    position: relative;
  }
  #hfc-erc .hfc-erc__rowtop {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
  }
  #hfc-erc .hfc-erc__rowlabel {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--erc-muted) !important;
  }
  #hfc-erc .hfc-erc__rowremove {
    background: none;
    border: none;
    color: var(--erc-muted) !important;
    font-size: 0.78rem;
    cursor: pointer;
    padding: 2px 6px;
  }
  #hfc-erc .hfc-erc__rowgrid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(70px, 1fr));
    gap: 8px;
  }
  #hfc-erc .hfc-erc__field label {
    display: block;
    font-size: 0.72rem;
    color: var(--erc-muted) !important;
    margin-bottom: 3px;
  }
  #hfc-erc .hfc-erc__field input {
    width: 100%;
    font-family: var(--erc-mono);
    font-size: 0.85rem;
    padding: 6px 8px;
    border: 1px solid var(--erc-line);
    border-radius: 7px;
    background: var(--erc-paper);
    color: var(--erc-ink) !important;
  }

  #hfc-erc .hfc-erc__addrow {
    display: inline-block;
    padding: 8px 14px;
    margin-bottom: 18px;
    background: var(--erc-card);
    border: 1px dashed var(--erc-line);
    border-radius: 8px;
    font-size: 0.82rem;
    color: var(--erc-ink) !important;
    cursor: pointer;
  }

  #hfc-erc .hfc-erc__result {
    background: var(--erc-card);
    border: 1px solid var(--erc-line);
    border-radius: 12px;
    padding: 18px;
    margin-bottom: 20px;
  }
  #hfc-erc .hfc-erc__resultmain {
    display: flex;
    align-items: baseline;
    gap: 12px;
    flex-wrap: wrap;
  }
  #hfc-erc .hfc-erc__rate {
    font-family: var(--erc-mono);
    font-size: 2.4rem;
    font-weight: 600;
    color: var(--erc-ink) !important;
    line-height: 1;
  }
  #hfc-erc .hfc-erc__resultlabel {
    font-size: 0.85rem;
    color: var(--erc-muted) !important;
  }
  #hfc-erc .hfc-erc__perpost {
    margin-top: 12px;
    display: flex;
    flex-direction: column;
    gap: 4px;
  }
  #hfc-erc .hfc-erc__perpostitem {
    font-size: 0.78rem;
    color: var(--erc-muted) !important;
    font-family: var(--erc-mono);
  }

  #hfc-erc .hfc-erc__benchmarks {
    background: var(--erc-card);
    border: 1px solid var(--erc-line);
    border-radius: 12px;
    padding: 16px;
  }
  #hfc-erc .hfc-erc__benchlist {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 8px;
  }
  #hfc-erc .hfc-erc__benchitem {
    display: flex;
    justify-content: space-between;
    font-size: 0.82rem;
    color: var(--erc-muted) !important;
    padding: 6px 8px;
    border-radius: 6px;
  }
  #hfc-erc .hfc-erc__benchitem.is-match {
    background: var(--erc-accent-soft);
    color: var(--erc-ink) !important;
    font-weight: 600;
  }
  #hfc-erc .hfc-erc__disclaimer {
    font-size: 0.74rem;
    color: var(--erc-muted) !important;
    margin: 0;
  }

  #hfc-erc button:focus-visible,
  #hfc-erc input:focus-visible {
    outline: 2px solid var(--erc-accent);
    outline-offset: 2px;
  }