/* =========================================================
   BTTK Article - Technical content posts
   Dùng cho bài viết INVT / Siemens / Delta có hình + bảng
========================================================= */

.bttk-article {
  max-width: 920px;
  margin: 0 auto;
  color: #1f2937;
  font-size: 16px;
  line-height: 1.75;
}

.bttk-article h1,
.bttk-article h2,
.bttk-article h3 {
  color: #111827;
  line-height: 1.3;
}

.bttk-article h1 {
  font-size: 32px;
  margin: 0 0 18px;
}

.bttk-article h2 {
  font-size: 24px;
  margin: 34px 0 12px;
}

.bttk-article h3 {
  font-size: 19px;
  margin: 24px 0 10px;
}

.bttk-article p {
  margin: 0 0 14px;
}

.bttk-article strong {
  color: #111827;
}

.bttk-article figure {
  margin: 24px 0;
  padding: 14px;
  border: 1px solid #e5e7eb;
  border-radius: 16px;
  background: #f9fafb;
}

.bttk-article figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 12px;
}

.bttk-article figcaption {
  margin-top: 10px;
  color: #6b7280;
  font-size: 14px;
  line-height: 1.5;
  text-align: center;
}

.bttk-article .table-wrap {
  overflow-x: auto;
  margin: 22px 0;
  border: 1px solid #e5e7eb;
  border-radius: 14px;
  background: #fff;
}

.bttk-article table {
  width: 100%;
  min-width: 680px;
  border-collapse: collapse;
  background: #fff;
}

.bttk-article th,
.bttk-article td {
  padding: 13px 14px;
  border-bottom: 1px solid #e5e7eb;
  text-align: left;
  vertical-align: top;
}

.bttk-article th {
  background: #f3f4f6;
  color: #111827;
  font-weight: 700;
}

.bttk-article tr:last-child td {
  border-bottom: 0;
}

.bttk-article .article-cta {
  margin-top: 34px;
  padding: 22px;
  border: 1px solid #fecaca;
  border-radius: 18px;
  background: #fff7f7;
}

.bttk-article .article-cta h2 {
  margin-top: 0;
  color: #b91c1c;
}

@media (max-width: 768px) {
  .bttk-article {
    font-size: 15px;
  }

  .bttk-article h1 {
    font-size: 26px;
  }

  .bttk-article h2 {
    font-size: 21px;
  }

  .bttk-article h3 {
    font-size: 18px;
  }

  .bttk-article figure {
    padding: 10px;
    border-radius: 12px;
  }

  .bttk-article table {
    min-width: 620px;
  }
}