/* ---------- Variables & reset ---------- */
:root {
  --qc-bg: #ffffff;
  --qc-page-bg: #f6f9fc;
  --qc-text: #0f1724;
  --qc-muted: #6b7280;
  --qc-accent: #0f62fe;
  --qc-border: #e6eef5;
  --qc-radius: 12px;
  --qc-container: 1100px;
  --qc-gap: 18px;
}

a {
  color: var(--qc-accent);
  text-decoration: none;
}

/* ---------- Layout ---------- */
.qc-wrap {
  max-width: var(--qc-container);
  margin: 28px auto;
  background: linear-gradient(180deg, #ffffff, #fbfdff);
  border-radius: var(--qc-radius);
  padding: 28px;
  border: 1px solid var(--qc-border);
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.06);
}
.tieudecard {
  margin-top: 0;
  font-size: 17px;
  color: #003c47;
  font-weight: bold;
}
.qc-header {
  display: flex;
  gap: 16px;
  align-items: center;
  margin-bottom: 12px;
}
.qc-brand {
  display: flex;
  gap: 14px;
  align-items: center;
}
.qc-logo {
  width: 56px;
  height: 56px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--qc-accent), #6fb1ff);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 800;
  font-size: 18px;
}
.qc-title {
  margin: 0;
  font-size: 20px;
  font-weight: 700;
}
.qc-sub {
  margin: 4px 0 0;
  color: var(--qc-muted);
  font-size: 14px;
}

.qc-toc {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 18px 0;
}
.qc-toc a {
  padding: 8px 12px;
  background: #f1f5f9;
  border-radius: 999px;
  font-weight: 600;
  font-size: 13px;
  color: #003c47;
}

.qc-main {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.qc-card {
  background: var(--qc-bg);
  padding: 18px;
  border-radius: 10px;
  border: 1px solid var(--qc-border);
}
.qc-card h2 {
  margin: 0 0 10px 0;
  font-size: 16px;
  color: var(--qc-accent);
}
.qc-card p,
.qc-card li {
  font-size: 16px;
  line-height: 1.9;
  color: var(--qc-text);
}
.qc-list {
  margin: 0 0 0 20px;
  padding: 0;
}
.qc-small {
  font-size: 16px;
  color: #003c47;
}

/* Table (if needed) */
.qc-table-wrap {
  overflow: auto;
  border-radius: 8px;
  border: 1px solid var(--qc-border);
  margin-top: 10px;
}
.qc-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 600px;
}
.qc-table th,
.qc-table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--qc-border);
  text-align: left;
  font-size: 14px;
}
.qc-table th {
  background: #fbfdff;
  font-weight: 700;
}

.qc-contact {
  margin-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.qc-row {
  display: flex;
  gap: 10px;
  align-items: center;
}
.qc-badge {
  background: #eef2ff;
  color: #00c4cc;
  padding: 6px 10px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 13px;
}

/* Responsive */
@media (max-width: 900px) {
  .qc-wrap {
    padding: 18px;
    margin: 18px;
  }
  .qc-title {
    font-size: 18px;
  }
}
@media (max-width: 520px) {
  .qc-header {
    gap: 10px;
  }
  .qc-logo {
    width: 48px;
    height: 48px;
  }
  .qc-toc a {
    padding: 7px 10px;
    font-size: 12px;
  }
}

/* Focus */
.qc-toc a:focus {
  outline: 3px solid rgba(15, 98, 254, 0.12);
  outline-offset: 3px;
  border-radius: 999px;
}