:root {
  --do: #B71D1F;
  --do-dam: #8E1518;
  --chu: #2F2F2F;
  --xam: #6B6B6B;
  --vien: #EFE9E6;
  --nen: #F8F4F2;
  --the: #FFFFFF;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--nen);
  color: var(--chu);
  font-family: "Be Vietnam Pro", "Segoe UI", Roboto, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
}
a { color: var(--do); }
a:hover { color: var(--do-dam); }
.khung { max-width: 860px; margin: 0 auto; padding: 0 16px; }

header { background: var(--the); border-bottom: 4px solid var(--do); }
header .khung { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-top: 14px; padding-bottom: 14px; }
header img { height: 52px; width: auto; display: block; }
header nav a { color: var(--chu); text-decoration: none; font-weight: 600; margin-left: 18px; }
header nav a:hover { color: var(--do); }

main { padding: 28px 0 40px; }
h1 { font-size: 28px; line-height: 1.25; margin: 0 0 8px; }
h2 { font-size: 20px; margin: 28px 0 8px; }
.phu { color: var(--xam); margin: 0 0 24px; }

.the { background: var(--the); border: 1px solid var(--vien); border-radius: 10px; padding: 18px 20px; margin-bottom: 14px; }
.the h3 { margin: 0 0 4px; font-size: 18px; color: var(--do); }
.the p { margin: 2px 0; }
.the a.goi { font-weight: 700; text-decoration: none; }

.kenh { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 8px; }
.kenh a {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 12px 18px; border-radius: 10px; text-decoration: none; font-weight: 700;
  color: #fff; background: var(--chu);
}
.kenh a.youtube { background: #FF0000; }
.kenh a.facebook { background: #1877F2; }
.kenh a.tiktok { background: #111111; }
.kenh svg { width: 22px; height: 22px; fill: currentColor; flex: none; }

.van-ban h2 { color: var(--do-dam); }
.van-ban ul { padding-left: 22px; }
.tieng-anh { border-left: 3px solid var(--vien); padding-left: 14px; color: var(--xam); }

footer { background: var(--chu); color: #ddd; font-size: 14px; }
footer .khung { padding-top: 18px; padding-bottom: 18px; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px; }
footer a { color: #fff; margin-right: 16px; }

@media (max-width: 600px) {
  header .khung { flex-direction: column; align-items: flex-start; }
  header img { height: 44px; }
  header nav a { margin: 0 16px 0 0; }
  h1 { font-size: 24px; }
  .kenh a { flex: 1 1 100%; justify-content: center; }
}

/* ---- trang chủ đầy đủ ---- */
.thanh-tren { background: var(--do-dam); color: #fff; font-size: 14px; }
.thanh-tren .khung { display: flex; flex-wrap: wrap; gap: 6px 18px; padding-top: 7px; padding-bottom: 7px; }
.thanh-tren a { color: #fff; text-decoration: none; font-weight: 600; }
.khung { max-width: 1120px; }
.van-ban.khung, .van-ban { max-width: 860px; }

.anh-bia { background: linear-gradient(120deg, var(--do-dam), var(--do) 55%, #D2393B); color: #fff; overflow: hidden; }
.anh-bia .khung { display: grid; grid-template-columns: 1.05fr 1fr; align-items: center; gap: 24px; padding-top: 40px; padding-bottom: 40px; }
.anh-bia h1 { font-size: 40px; color: #fff; margin: 6px 0 12px; }
.anh-bia p { font-size: 18px; margin: 0 0 22px; opacity: .95; }
.anh-bia .nhan { text-transform: uppercase; letter-spacing: .08em; font-size: 13px; font-weight: 700; margin: 0; opacity: .85; }
.anh-bia-xe { width: 100%; height: auto; filter: drop-shadow(0 18px 24px rgba(0,0,0,.35)); }
.nut-hang { display: flex; flex-wrap: wrap; gap: 12px; }
.nut { display: inline-block; padding: 13px 22px; border-radius: 10px; font-weight: 700; text-decoration: none; }
.nut-trang { background: #fff; color: var(--do); }
.nut-trang:hover { color: var(--do-dam); }
.nut-vien { border: 2px solid #fff; color: #fff; }
.nut-vien:hover { background: rgba(255,255,255,.12); color: #fff; }

.ly-do { background: var(--the); border-bottom: 1px solid var(--vien); }
.luoi-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; padding-top: 20px; padding-bottom: 20px; }
.luoi-4 div { border-left: 3px solid var(--do); padding-left: 12px; }
.luoi-4 strong { display: block; font-size: 17px; }
.luoi-4 span { color: var(--xam); font-size: 14px; line-height: 1.45; }

.lam-nhanh { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-bottom: 8px; }
.lam-nhanh a { background: var(--the); border: 1px solid var(--vien); border-radius: 12px; padding: 16px 10px; text-align: center; text-decoration: none; color: var(--chu); font-weight: 600; }
.lam-nhanh a:hover { border-color: var(--do); color: var(--do); }
.bieu-tuong { display: block; font-size: 26px; margin-bottom: 4px; color: var(--do); }

.luoi-xe { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.xe { background: var(--the); border: 1px solid var(--vien); border-radius: 12px; padding: 14px; display: flex; flex-direction: column; }
.xe img { width: 100%; aspect-ratio: 4 / 3; object-fit: contain; }
.xe h3 { margin: 6px 0 0; font-size: 18px; }
.xe p { margin: 0 0 10px; color: var(--xam); font-size: 14px; }
.xe a { margin-top: auto; text-align: center; border: 1.5px solid var(--do); border-radius: 8px; padding: 8px; font-weight: 700; text-decoration: none; }
.xe a:hover { background: var(--do); color: #fff; }
.xe-them { justify-content: center; background: var(--nen); border-style: dashed; }

.luoi-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.luoi-3 .the { margin-bottom: 0; }
.the ul { margin: 6px 0 0; padding-left: 18px; }
.the li { margin-bottom: 4px; }
.anh-phu-tung { display: flex; gap: 8px; margin-top: 10px; }
.anh-phu-tung img { width: 33%; aspect-ratio: 1; object-fit: contain; background: var(--nen); border-radius: 8px; padding: 6px; }
.chi-duong { display: inline-block; margin-top: 8px; font-weight: 700; }

.nut-goi-noi { display: none; }

@media (max-width: 900px) {
  .anh-bia .khung { grid-template-columns: 1fr; }
  .anh-bia h1 { font-size: 30px; }
  .anh-bia .khung { padding-top: 28px; padding-bottom: 24px; }
  .anh-bia-xe { max-width: 380px; justify-self: center; }
  .luoi-4, .lam-nhanh { grid-template-columns: repeat(2, 1fr); }
  .luoi-xe { grid-template-columns: repeat(2, 1fr); }
  .luoi-3 { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .nut-goi-noi { display: block; position: fixed; right: 16px; bottom: 16px; background: var(--do); color: #fff; font-weight: 700; padding: 13px 18px; border-radius: 30px; text-decoration: none; box-shadow: 0 6px 18px rgba(0,0,0,.25); z-index: 10; }
  header nav { display: flex; flex-wrap: wrap; gap: 4px 0; }
}