body { margin: 0; padding: 24px 16px; background: #F4F5F6; }

:root {
    --flex-red: #E60000;
    --flex-dark-blue: #022A3A;
    --flex-cyan: #4ACCD4;
    --flex-light-gray: #D0D2D3;
    --flex-dark-gray: #252729;
    --flex-mid-gray: #6B7280;
    --flex-bg-subtle: #F4F5F6;
  }
  #sbi-app {
    font-family: 'Montserrat', system-ui, -apple-system, 'Segoe UI', sans-serif;
    color: var(--flex-dark-gray);
    background: #FFFFFF;
    max-width: 780px;
    margin: 0 auto;
  }
  #sbi-app .brand {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 4px;
  }
  #sbi-app .brand-logo {
    font-weight: 800;
    font-size: 14px;
    color: var(--flex-red);
    letter-spacing: -0.3px;
  }
  #sbi-app .brand-tag {
    font-size: 11px;
    color: var(--flex-mid-gray);
    text-transform: uppercase;
    letter-spacing: 0.5px;
  }
  #sbi-app h1 {
    font-weight: 800;
    color: var(--flex-dark-blue);
    font-size: 22px;
    margin: 4px 0 2px;
  }
  #sbi-app .subtitle {
    font-size: 13px;
    color: var(--flex-mid-gray);
    margin-bottom: 18px;
  }
  #sbi-app .step-label {
    font-size: 11px;
    font-weight: 700;
    color: var(--flex-red);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
    margin-top: 20px;
  }
  #sbi-app .tab-row {
    display: flex;
    gap: 8px;
    margin-bottom: 4px;
  }
  #sbi-app .tab {
    flex: 1;
    text-align: center;
    padding: 10px 8px;
    border-radius: 8px;
    border: 2px solid var(--flex-light-gray);
    background: var(--flex-bg-subtle);
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
    color: var(--flex-dark-gray);
    transition: all 0.15s ease;
  }
  #sbi-app .tab.active {
    border-color: var(--flex-dark-blue);
    background: var(--flex-dark-blue);
    color: #fff;
  }
  #sbi-app .scenario-grid {
    display: flex;
    flex-direction: column;
    gap: 8px;
  }
  #sbi-app .scenario-card {
    border: 2px solid var(--flex-light-gray);
    border-radius: 8px;
    padding: 10px 12px;
    cursor: pointer;
    font-size: 12.5px;
    line-height: 1.4;
    transition: all 0.15s ease;
  }
  #sbi-app .scenario-card.active {
    border-color: var(--flex-cyan);
    background: #EEFCFD;
  }
  #sbi-app .scenario-card strong { color: var(--flex-dark-blue); }
  #sbi-app .type-row {
    display: flex;
    gap: 8px;
  }
  #sbi-app .type-pill {
    flex: 1;
    text-align: center;
    padding: 8px;
    border-radius: 20px;
    border: 2px solid var(--flex-light-gray);
    cursor: pointer;
    font-size: 12.5px;
    font-weight: 600;
  }
  #sbi-app .type-pill.active.pos { border-color: var(--flex-cyan); background: #EEFCFD; color: #0d7c83; }
  #sbi-app .type-pill.active.neg { border-color: var(--flex-red); background: #FDE8E8; color: var(--flex-red); }
  #sbi-app .field-block { margin-bottom: 12px; }
  #sbi-app .field-title {
    font-size: 12.5px;
    font-weight: 700;
    color: var(--flex-dark-blue);
    margin-bottom: 4px;
  }
  #sbi-app .field-hint {
    font-size: 11px;
    color: var(--flex-mid-gray);
    margin-bottom: 6px;
  }
  #sbi-app textarea {
    width: 100%;
    border: 1.5px solid var(--flex-light-gray);
    border-radius: 8px;
    padding: 10px;
    font-family: inherit;
    font-size: 13px;
    resize: vertical;
    min-height: 54px;
    box-sizing: border-box;
    color: var(--flex-dark-gray);
  }
  #sbi-app textarea:focus { outline: none; border-color: var(--flex-dark-blue); }
  #sbi-app .analyze-btn {
    width: 100%;
    background: var(--flex-red);
    color: #fff;
    border: none;
    border-radius: 8px;
    padding: 13px;
    font-size: 14px;
    font-weight: 700;
    cursor: pointer;
    margin-top: 8px;
    transition: background 0.15s ease;
  }
  #sbi-app .analyze-btn:hover { background: #c20000; }
  #sbi-app .analyze-btn:disabled { background: var(--flex-mid-gray); cursor: not-allowed; }
  #sbi-app .loading {
    display: none;
    text-align: center;
    padding: 20px;
    font-size: 13px;
    color: var(--flex-mid-gray);
  }
  #sbi-app .loading.show { display: block; }
  #sbi-app .spinner {
    width: 22px; height: 22px;
    border: 3px solid var(--flex-light-gray);
    border-top-color: var(--flex-red);
    border-radius: 50%;
    margin: 0 auto 8px;
    animation: sbispin 0.8s linear infinite;
  }
  @keyframes sbispin { to { transform: rotate(360deg); } }
  #sbi-app .results { display: none; margin-top: 18px; }
  #sbi-app .results.show { display: block; }
  #sbi-app .result-card {
    border-radius: 8px;
    padding: 12px 14px;
    margin-bottom: 10px;
    border-left: 4px solid var(--flex-light-gray);
    background: var(--flex-bg-subtle);
  }
  #sbi-app .result-card.strong { border-left-color: var(--flex-cyan); background: #EEFCFD; }
  #sbi-app .result-card.weak { border-left-color: var(--flex-red); background: #FDE8E8; }
  #sbi-app .result-head {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 12.5px;
    font-weight: 700;
    color: var(--flex-dark-blue);
    margin-bottom: 4px;
  }
  #sbi-app .result-body { font-size: 12.5px; line-height: 1.5; color: var(--flex-dark-gray); }
  #sbi-app .rewrite-box {
    background: var(--flex-dark-blue);
    color: #fff;
    border-radius: 8px;
    padding: 14px;
    margin-top: 6px;
    font-size: 12.5px;
    line-height: 1.6;
  }
  #sbi-app .rewrite-box .rw-label {
    font-size: 10.5px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--flex-cyan);
    margin-bottom: 6px;
  }
  #sbi-app .tip-box {
    background: #fffbe6;
    border-left: 4px solid #f0a500;
    border-radius: 0 8px 8px 0;
    padding: 10px 14px;
    margin-top: 10px;
    font-size: 12.5px;
    line-height: 1.5;
    color: #6b5300;
  }
  #sbi-app .action-box {
    background: #EEFCFD;
    border-left: 4px solid var(--flex-cyan);
    border-radius: 0 8px 8px 0;
    padding: 10px 14px;
    margin-top: 10px;
    font-size: 12.5px;
    line-height: 1.5;
    color: #0d5a60;
  }
  #sbi-app .error-box {
    background: #FDE8E8;
    color: var(--flex-red);
    border-radius: 8px;
    padding: 12px;
    font-size: 12.5px;
    margin-top: 10px;
    display: none;
  }
  #sbi-app .error-box.show { display: block; }
  #sbi-app .retry-btn {
    background: none;
    border: 1.5px solid var(--flex-dark-blue);
    color: var(--flex-dark-blue);
    border-radius: 6px;
    padding: 8px 14px;
    font-size: 12.5px;
    font-weight: 600;
    cursor: pointer;
    margin-top: 12px;
  }