#jfv-root, #jfv-root * { box-sizing: border-box; }

  #jfv-root {
    --jfv-ink: #1b2430;
    --jfv-sub: #5c6b7a;
    --jfv-line: #e2e6ea;
    --jfv-bg: #ffffff;
    --jfv-panel-bg: #f8fafb;
    --jfv-accent: #2456d6;
    --jfv-accent-dark: #1a3fa8;
    --jfv-success-bg: #eafaf1;
    --jfv-success-border: #34b567;
    --jfv-success-text: #146c3a;
    --jfv-error-bg: #fdecec;
    --jfv-error-border: #e14b4b;
    --jfv-error-text: #a11f1f;
    --jfv-radius: 10px;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: var(--jfv-ink);
    max-width: 900px;
    margin: 0 auto;
    line-height: 1.5;
  }

  #jfv-root .jfv-card {
    background: var(--jfv-bg);
    border: 1px solid var(--jfv-line);
    border-radius: var(--jfv-radius);
    padding: 20px;
    box-shadow: 0 1px 3px rgba(20, 30, 45, 0.06);
  }

  #jfv-root .jfv-toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
    margin-bottom: 16px;
  }

  #jfv-root .jfv-sep {
    width: 1px;
    height: 24px;
    background: var(--jfv-line);
    margin: 0 4px;
  }

  #jfv-root .jfv-btn {
    font-family: inherit;
    font-size: 14px;
    font-weight: 600;
    padding: 9px 16px;
    border-radius: 8px;
    border: 1px solid var(--jfv-line);
    background: #ffffff;
    color: var(--jfv-ink);
    cursor: pointer;
    transition: background 0.15s ease, border-color 0.15s ease, transform 0.05s ease;
  }

  #jfv-root .jfv-btn:hover { background: #f1f4f8; border-color: #c9d2db; }
  #jfv-root .jfv-btn:active { transform: translateY(1px); }
  #jfv-root .jfv-btn:focus-visible { outline: 2px solid var(--jfv-accent); outline-offset: 2px; }

  #jfv-root .jfv-btn-primary {
    background: var(--jfv-accent);
    border-color: var(--jfv-accent);
    color: #ffffff;
  }
  #jfv-root .jfv-btn-primary:hover { background: var(--jfv-accent-dark); border-color: var(--jfv-accent-dark); }

  #jfv-root .jfv-btn-ghost {
    background: transparent;
    color: var(--jfv-sub);
    border-color: transparent;
  }
  #jfv-root .jfv-btn-ghost:hover { background: var(--jfv-panel-bg); color: var(--jfv-ink); }

  #jfv-root .jfv-panel { margin-bottom: 14px; }

  #jfv-root .jfv-panel-head {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 6px;
  }

  #jfv-root .jfv-panel-head label {
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--jfv-sub);
  }

  #jfv-root .jfv-count {
    font-size: 12px;
    color: var(--jfv-sub);
  }

  #jfv-root .jfv-textarea {
    width: 100%;
    min-height: 220px;
    resize: vertical;
    padding: 14px;
    border: 1px solid var(--jfv-line);
    border-radius: 8px;
    background: var(--jfv-panel-bg);
    color: var(--jfv-ink);
    font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
    font-size: 13.5px;
    line-height: 1.6;
    tab-size: 2;
  }

  #jfv-root .jfv-textarea:focus {
    outline: none;
    border-color: var(--jfv-accent);
    background: #ffffff;
    box-shadow: 0 0 0 3px rgba(36, 86, 214, 0.12);
  }

  #jfv-root .jfv-textarea-output { min-height: 220px; }

  #jfv-root .jfv-output-actions {
    display: flex;
    gap: 8px;
    margin-top: 10px;
  }

  #jfv-root .jfv-message {
    display: none;
    padding: 12px 14px;
    border-radius: 8px;
    font-size: 14px;
    margin-bottom: 14px;
    border: 1px solid transparent;
  }

  #jfv-root .jfv-message.jfv-show { display: block; }

  #jfv-root .jfv-message.jfv-success {
    background: var(--jfv-success-bg);
    border-color: var(--jfv-success-border);
    color: var(--jfv-success-text);
  }

  #jfv-root .jfv-message.jfv-error {
    background: var(--jfv-error-bg);
    border-color: var(--jfv-error-border);
    color: var(--jfv-error-text);
  }

  #jfv-root .jfv-message strong { display: block; margin-bottom: 2px; }

  #jfv-root .jfv-privacy {
    font-size: 12.5px;
    color: var(--jfv-sub);
    margin: 4px 0 0;
    text-align: center;
  }

  @media (max-width: 600px) {
    #jfv-root .jfv-card { padding: 14px; border-radius: 8px; }
    #jfv-root .jfv-toolbar { gap: 6px; }
    #jfv-root .jfv-btn { flex: 1 1 auto; padding: 10px 10px; font-size: 13.5px; }
    #jfv-root .jfv-sep { display: none; }
    #jfv-root .jfv-output-actions { flex-direction: column; }
    #jfv-root .jfv-output-actions .jfv-btn { width: 100%; }
    #jfv-root .jfv-textarea { min-height: 180px; font-size: 13px; }
  }