:root {
    --primary: #a83258;
    --primary-dark: #7d2340;
    --bg: #fffdfb;
    --gold: #c98a3e;
    --blush: #fbeef1;
    --sand: #f7efe6;
    --text: #3a2a2f;
    --muted: #6e5a60;
    --line: #eddcd2;
  }
  h1, h2, h3 { color: var(--primary-dark); line-height: 1.3; }
  h2 { font-size: 1.6rem; margin: 56px 0 16px; padding-bottom: 10px; border-bottom: 2px solid var(--line); }
  h3 { font-size: 1.1rem; margin: 0 0 6px; }
  p { margin: 0 0 16px; }
  a { color: var(--primary); font-weight: 600; text-decoration: underline; text-underline-offset: 3px; }
  a:hover { color: var(--primary-dark); }
  a:focus-visible { outline: 2px solid var(--gold); outline-offset: 2px; }

  /* Banner ưu đãi đầu bài */
  .article-promo .hero {
    margin: 0 -20px 32px;
    padding: 44px 28px 36px;
    background: linear-gradient(160deg, var(--blush) 0%, var(--sand) 100%);
    border-bottom: 3px solid var(--gold);
    text-align: center;
  }
  .article-promo .hero-badge {
    display: inline-block;
    padding: 6px 18px;
    border: 1.5px solid var(--gold);
    border-radius: 999px;
    color: var(--gold);
    font-weight: 700;
    font-size: 0.95rem;
    letter-spacing: 0.04em;
    background: #fff;
  }
  .hero h1 {font-size: 2rem;margin: 18px auto 22px;max-width: 640px;line-height: 1.2;color: var(--primary-dark);}
  .hero-offer {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    padding: 16px 32px;
    background: var(--primary);
    color: #fff;
    border-radius: 14px;
    box-shadow: 0 10px 24px rgba(168, 50, 88, 0.22);
  }
  .hero-offer strong { font-size: 2.3rem; line-height: 1.1; }
  .hero-offer span { font-size: 0.95rem; opacity: 0.92; }

  /* Sapo */
  .sapo { font-style: italic; font-weight: 600; color: var(--primary-dark); }
  .sapo p:last-child { margin-bottom: 0; }

  /* Thẻ ưu đãi */
  .highlight-box {
    background: #fff;
    border: 1.5px solid var(--primary);
    border-radius: 16px;
    padding: 24px 26px;
    margin: 20px 0;
  }
  .offer-row { display: flex; gap: 18px; align-items: flex-start; }
  .offer-amount {
    flex-shrink: 0;
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--primary);
    background: var(--blush);
    border-radius: 12px;
    padding: 10px 16px;
    line-height: 1.2;
    text-align: center;
  }
  .offer-amount small { display: block; font-size: 0.75rem; font-weight: 600; color: var(--muted); }
  .offer-row p { margin: 0; }
  .note {
    display: flex; gap: 10px;
    font-size: 0.95rem;
    color: var(--muted);
    background: var(--sand);
    border-radius: 10px;
    padding: 12px 16px;
    margin-top: 16px;
  }
  .note svg { flex-shrink: 0; margin-top: 4px; }

  /* So sánh hai phương án */
  .compare { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin: 24px 0; }
  .compare-col { border-radius: 14px; padding: 20px; }
  .compare-col.single { background: var(--sand); }
  .compare-col.combo { background: var(--blush); border: 1.5px solid var(--primary); }
  .compare-col h3 { font-size: 1.05rem; }
  .compare-col ul { margin: 8px 0 0; padding-left: 20px; }
  .compare-col li { margin-bottom: 6px; }

  /* Lưới trường hợp */
  .case-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin: 20px 0 24px; }
  .case-card {
    background: #fff;
    border: 1px solid var(--line);
    border-left: 4px solid var(--gold);
    border-radius: 12px;
    padding: 16px 18px;
  }
  .case-card p { margin: 0; font-size: 0.97rem; color: var(--muted); }

  .insight-box {
    background: linear-gradient(135deg, #fff7ee, var(--blush));
    border-radius: 14px;
    padding: 20px 24px;
    margin: 20px 0;
  }
  .insight-box p:last-child { margin-bottom: 0; }
  .insight-box .lead {font-size: 1.15rem; font-weight: 700; color: var(--primary-dark); }

  /* Các yếu tố đánh giá */
  .factor-list {
    list-style: none;
    padding: 0;
    margin: 20px 0;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
  }
  .factor-list li {
    background: var(--sand);
    border-radius: 10px;
    padding: 12px 14px;
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--primary-dark);
    display: flex; align-items: center; gap: 8px;
  }
  .factor-list li::before {
    content: "";
    width: 8px; height: 8px;
    border-radius: 50%;
    background: var(--gold);
    flex-shrink: 0;
  }

  /* Thông tin bác sĩ và nơi phẫu thuật */
  .doctor-box {
    display: flex; gap: 18px; align-items: center;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 18px 22px;
    margin: 20px 0;
  }
  .doctor-box .icon {
    flex-shrink: 0;
    width: 52px; height: 52px;
    border-radius: 50%;
    background: var(--blush);
    display: flex; align-items: center; justify-content: center;
  }
  .doctor-box p { margin: 0; }

  .warning-box {
    background: #fff8ef;
    border: 1px solid #f0d5ae;
    border-radius: 14px;
    padding: 20px 24px;
    margin: 20px 0;
  }
  .warning-box h3 { color: #8a5a1c; display: flex; align-items: center; gap: 8px; }
  .warning-box ul { margin: 8px 0 0; padding-left: 20px; }
  .warning-box li { margin-bottom: 6px; }

  /* Khối CTA */
  .cta-block {
    margin-top: 56px;
    background: var(--primary-dark);
    color: #fff;
    border-radius: 20px;
    padding: 36px 30px;
    text-align: center;
  }
  .cta-block h2 { color: #fff; border: 0; margin: 0 0 14px; padding: 0; }
  .cta-block p { color: #f6e6ea; max-width: 600px; margin: 0 auto 14px; }
  .cta-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-top: 24px; }
  .btn-main { background: var(--gold); color: #fff; }
  .btn-main:hover { background: #b37631; color: #fff; }
  .btn-outline { border: 1.5px solid #fff; color: #fff; }
  .btn-outline:hover { background: rgba(255, 255, 255, 0.12); color: #fff; }
  .btn:focus-visible { outline: 2px solid #fff; outline-offset: 3px; }
/* Lưới các vùng áp dụng */
  .zone-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 14px;
    margin: 20px 0;
  }
  .zone-card {
    background: #fff;
    border: 1px solid #eadfd8;
    border-top: 3px solid var(--primary);
    border-radius: 14px;
    padding: 16px 18px;
    font-size: 15.5px;
    line-height: 1.6;
  }
  .zone-card h3 { font-size: 17px; margin: 0 0 6px; }
  .zone-card h3 a { text-decoration: none; }
  .zone-card h3 a:hover { text-decoration: underline; }
/* Quy trình theo bước */
  .stage-timeline { list-style: none; margin: 24px 0; padding: 0; position: relative; }
  .stage-timeline::before {
    content: ""; position: absolute; left: 21px; top: 8px; bottom: 8px;
    width: 2px; background: linear-gradient(var(--primary), var(--gold));
  }
  .stage-timeline li { position: relative; padding: 0 0 22px 64px; }
  .stage-timeline .step-num {
    position: absolute; left: 0; top: 0;
    width: 44px; height: 44px; border-radius: 50%;
    background: var(--primary); color: #fff; font-weight: 700;
    display: flex; align-items: center; justify-content: center;
    box-shadow: 0 0 0 5px var(--bg);
  }
  .stage-timeline h3 { margin: 6px 0 8px; font-size: 19px; }
  /* Mobile */
  @media (max-width: 640px) {
    body { font-size: 16px; }
    .hero h1 { font-size: 1.55rem; }
    .hero-offer strong { font-size: 1.9rem; }
    h2 { font-size: 1.35rem; margin-top: 44px; }
    .compare, .case-grid { grid-template-columns: 1fr; }
    .factor-list { grid-template-columns: 1fr 1fr; }
    .offer-row { flex-direction: column; }
    .doctor-box { flex-direction: column; text-align: center; }
    .cta-block { padding: 28px 20px; }
  }