:root{
  --brand:#63C047;      /* đổi đúng mã xanh brand nếu có */
  --brand-600:#43a72f;
  --brand-700:#2f8e22;
  --brand-soft:rgba(99,192,71,.12);
  --brand-border:rgba(99,192,71,.22);
  --ink:#111827;
  --muted:#6b7280;
  --radius:14px;
  --shadow:0 10px 24px rgba(18,38,63,.06);
  --shadow-lg:0 18px 42px rgba(18,38,63,.12);
}

/* Breadcrumb */
.breadcrumb{ --bs-breadcrumb-divider:"›"; }
.breadcrumb .breadcrumb-item a{ color:var(--brand-700); text-decoration:none; }
.breadcrumb .breadcrumb-item a:hover{ text-decoration:underline; }

/* Hero */
.tr-hero{
  position:relative; height:240px;
  background: linear-gradient(135deg, rgba(99,192,71,.14), rgba(67,167,47,.08)),
              url('https://preview.redd.it/erhh32d4x5x41.jpg?auto=webp&s=2efb50e7a8bf791d8d050fb95d0917b0ec39fb74') center/cover no-repeat;
  border:1px solid var(--brand-border);
}
.tr-hero__overlay{ position:absolute; inset:0; background:linear-gradient(180deg,rgba(0,0,0,.1),rgba(0,0,0,.35)); }
.tr-hero__content{
  position:relative; z-index:1; height:100%;
  display:flex; flex-direction:column; align-items:center; justify-content:center; text-align:center; color:#fff;
}
.tr-hero h1{ font-weight:900; letter-spacing:.2px; }

/* Cards */
.tr-card{
  border:1px solid var(--brand-border);
  border-radius:var(--radius);
  background:#fff;
  padding:1.1rem 1.1rem 1.2rem;
  box-shadow:var(--shadow);
}
.tr-card + .tr-card{ margin-top:1rem; }
.tr-card:hover{ box-shadow:var(--shadow-lg); }
.tr-card h2{ font-size:1.25rem; font-weight:900; color:var(--brand-700); margin-bottom:.6rem; }

/* TOC */
.sticky-card{ position:sticky; top:88px; }
.tr-toc li{ margin:.3rem 0; }
.tr-toc a{
  display:block; padding:.5rem .7rem; border-radius:10px;
  color:#1f2937; text-decoration:none; border:1px solid transparent; transition:all .16s ease;
}
.tr-toc a:hover{ background:var(--brand-soft); border-color:var(--brand-border); color:var(--brand-700); }
.tr-updated{ font-size:.94rem; color:var(--muted); }

/* Lists */
.tr-list{ margin:0; padding-left:0; list-style:none; }
.tr-list > li{
  position:relative; padding-left:1.6rem; margin:.35rem 0; color:#1f2937;
}
.tr-list > li::before{
  content:""; position:absolute; left:.2rem; top:.45rem;
  width:.85rem; height:.85rem; border-radius:50%; background:var(--brand);
  box-shadow:0 0 0 4px var(--brand-soft);
}

/* Callout */
.tr-callout{
  border:1px solid var(--brand-border); border-radius:12px; background:#fff; padding:.9rem;
  display:flex; gap:.7rem; align-items:flex-start;
}
.tr-callout.warn i{ color:#f59e0b; font-size:18px; margin-top:2px; }

/* Contact list */
.tr-contact li{ margin:.35rem 0; color:#1f2937; }
.tr-contact i{ width:20px; text-align:center; color:var(--brand-700); margin-right:.35rem; }

/* Buttons */
.btn-success, .btn-primary{
  background:var(--brand) !important; border-color:var(--brand) !important;
}
.btn-success:hover, .btn-primary:hover{
  background:var(--brand-600) !important; border-color:var(--brand-600) !important;
  transform:translateY(-1px); box-shadow:0 12px 26px rgba(99,192,71,.22);
}
.btn-outline-success{ border-color:var(--brand); color:var(--brand-700); }
.btn-outline-success:hover{ background:var(--brand); color:#fff; }
.btn-ghost{ background:var(--brand-soft); border:1px solid var(--brand-border); color:var(--brand-700); }
.btn-ghost:hover{ background:rgba(99,192,71,.18); border-color:var(--brand); }

/* Responsive */
@media (max-width:575.98px){
  .tr-hero{ height:180px; }
}