:root {
    --max-width: 900px;
    --accent: #f0f0f0;
    --border: #cfcfcf;
    --warning: #d9534f;
    --bg: #fff;
    --text: #111;
    --content-bg: #fff;
    --btn-bg: #f7f7f7;
    --btn-text: #111;
    --input-bg: #fff;
    --input-text: #111;
    --weight-bg: gray;
    --weight-text: #fff;
  }

  [data-theme="dark"] {
    --accent: #2a2a2a;
    --border: #444;
    --warning: #ff6b6b;
    --bg: #121212;
    --text: #e8e8e8;
    --content-bg: #1e1e1e;
    --btn-bg: #2a2a2a;
    --btn-text: #e8e8e8;
    --input-bg: #2a2a2a;
    --input-text: #e8e8e8;
    --weight-bg: #333;
    --weight-text: #fff;
  }

  body {
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
    margin: 0;
    padding: 16px;
    background: var(--bg);
    color: var(--text);
    display: flex;
    justify-content: center;
    transition: background 0.25s, color 0.25s;
  }

  .container {
    width: 100%;
    max-width: var(--max-width);
  }

  /* Header */
  .weight-box {
    background: var(--weight-bg);
    color: var(--weight-text);
    text-align: center;
    padding: 12px 10px;
    border-radius: 6px;
    font-weight: 700;
    font-size: 1.4rem;
    box-sizing: border-box;
    transition: background 0.25s;
  }

  /* Controls: search on top, buttons row below */
  .controls {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    margin: 12px 0;
  }

  #searchBox {
    width: 100%;
    max-width: 520px;
    padding: 10px 12px;
    border-radius: 8px;
    border: 1px solid var(--border);
    font-size: 1rem;
    box-sizing: border-box;
    background: var(--input-bg);
    color: var(--input-text);
    transition: background 0.25s, color 0.25s, border-color 0.25s;
  }

  .btn-row {
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    gap: 8px;
  }

  .small-btn {
    padding: 10px 12px;
    border-radius: 8px;
    background: var(--btn-bg);
    border: 1px solid var(--border);
    color: var(--btn-text);
    cursor: pointer;
    font-size: 0.95rem;
    white-space: nowrap;
    transition: background 0.25s, color 0.25s, border-color 0.25s;
  }

  #themeToggle {
    padding: 10px 12px;
    border-radius: 8px;
    background: var(--btn-bg);
    border: 1px solid var(--border);
    color: var(--btn-text);
    cursor: pointer;
    font-size: 1rem;
    line-height: 1;
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 5px;
    transition: background 0.25s, color 0.25s, border-color 0.25s;
  }

  /* Accordion */
  .accordion {
    margin: 0 auto;
    width: 100%;
  }

  .accordion-item {
    border: 1px solid var(--border);
    border-radius: 8px;
    margin-bottom: 10px;
    overflow: hidden;
    transition: border-color 0.25s;
  }

  .accordion-header {
    width: 100%;
    text-align: left;
    background: var(--accent);
    color: var(--text);
    padding: 12px 14px;
    border: 0;
    font-weight: 700;
    font-size: 1.05rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    cursor: pointer;
    transition: background 0.25s, color 0.25s;
  }

  .accordion-header:focus {
    outline: 3px solid #bde0ff;
    outline-offset: 2px;
  }

  .accordion-title {
    flex: 1;
    text-align: center;
  }

  .accordion-content {
    display: none;
    background: var(--content-bg);
    padding: 12px;
    text-align: center;
    transition: background 0.25s;
  }

  .accordion-content.show {
    display: block;
  }

  .img-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 6px;
    align-items: center;
    margin-bottom: 12px;
  }

  .img-grid img {
    width: 200px;
    height: 200px;
    object-fit: contain;
    display: inline-block;
  }

  .warning {
    color: var(--warning);
    font-weight: 800;
  }

  /* Banners — shared base; only background differs per variant */
  .first-dose-banner,
  .second-dose-banner,
  .warning-banner {
    text-align: center;
    padding: 10px 16px;
    border-radius: 6px;
    margin-bottom: 12px;
  }

  .first-dose-banner h1,
  .second-dose-banner h1,
  .warning-banner h1 {
    font-size: clamp(1.2rem, 4vw, 1.8rem);
    font-weight: 700;
    color: #fff;
    letter-spacing: 2px;
    text-transform: uppercase;
    margin: 0;
  }

  .first-dose-banner {
    background: #1565c0;
  }

  .second-dose-banner {
    background: #000000;
  }

  .warning-banner {
    background: #ff0000;
  }

  /* Colors for each section type */
  .detail-section.indications {
    background-color: #4caf50;
    color: #ffffff;
  }

  .detail-section.side-effects {
    background-color: #ffeb3b;
    color: #000000;
  }

  .detail-section.considerations {
    background-color: #ff0000;
    color: #ffffff;
  }

  /* Dose Cards */
  .dose-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 12px;
  }

  .dose-card {
    background: var(--accent);
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    transition: background 0.25s, border-color 0.25s;
  }

  .dose-card img {
    width: 100%;
    aspect-ratio: 1;
    object-fit: contain;
    max-width: 100%;
    margin: 10px auto 0;
  }

  .dose-card-body {
    padding: 8px 10px 12px;
    width: 100%;
  }

  .dose-card-body p {
    font-size: clamp(1.1rem, 3vw, 1.4rem); /* main dose value */
    font-weight: 600;
    color: var(--text);
    margin: 0 0 2px;
    transition: color 0.25s;
  }

  .dose-card-body p.secondary {
    font-size: clamp(0.85rem, 2.2vw, 1rem); /* label/unit text */
    font-weight: 100;
    color: var(--text);
    opacity: 0.65;
    margin: 0;
  }

  .weight-group {
    margin-bottom: 8px;
  }

  .weight-group-title {
    font-size: clamp(0.95rem, 2.5vw, 1.1rem);
    font-weight: 800;
    text-align: center;
    margin: 0 0 10px;
    color: var(--text);
    transition: color 0.25s;
  }

  @media (max-width: 520px) {
    .accordion-header {
      padding: 10px;
      font-size: 1rem;
    }

    .weight-box {
      font-size: 1.15rem;
      padding: 10px;
    }

    .small-btn,
    #themeToggle {
      padding: 9px 10px;
      font-size: 0.88rem;
    }

    .dose-cards {
      grid-template-columns: 1fr;
    }
  }
  #backButton {
  background: #1565c0;
  color: #fff;
  border: 2px solid #0d47a1;
  font-weight: 800;
  box-shadow: 0 2px 6px rgba(0,0,0,0.18);
}

#backButton:hover {
  background: #0d47a1;
}

#backButton:focus-visible {
  outline: 4px solid #ffd54f;
  outline-offset: 3px;
}
.sticky-header {
  position: sticky;
  top: 16px;  /* Matches your body padding; adjust as needed */
  z-index: 10;  /* Ensures it stays above accordion content */
  background: var(--bg);  /* Prevents transparency issues while scrolling */
  margin-bottom: 12px;
}
.weight-3-5kg  {background: #999999; color: #ffffff;} /* Gray */
.weight-6-7kg  {background: #FF00AA; color: #ffffff;} /* Pink */
.weight-8-9kg  {background: #FF0000; color: #ffffff;} /* Red */
.weight-10-11kg  {background: #8600B3; color: #ffffff;} /* Purple */
.weight-12-14kg  {background: #FFFB17; color: #000000;} /* Yellow */
.weight-15-18kg  {background: #FFFFFF; color: #000000;} /* White */
.weight-19-23kg  {background: #012893; color: #ffffff;} /* Blue */
.weight-24-29kg  {background: #FF6600; color: #ffffff;} /* Orange */
.weight-30-36kg  {background: #006200; color: #ffffff;} /* Green */
.weight-37-60kg  {background: #000000; color: #ffffff;} /* Black */