/* HiAcademy — giao diện. Màu lấy theo logo HiAcademy: xanh ngọc + vàng cánh máy bay giấy (#EDB354). */
:root {
  --chu-dao: #007a7e;        /* xanh ngọc đậm — dùng cho chữ, nút (đủ tương phản trên nền trắng) */
  --chu-dao-sang: #009a9e;   /* xanh ngọc logo — chỉ để trang trí */
  --chu-dao-nhat: #e6f5f5;
  --xanh-nhat-logo: #54efef;  /* xanh nhạt nhất trong logo — nhãn Miễn phí, chữ trên nó dùng #004d50 (tương phản 6,9:1) */
  --vang: #edb354;           /* vàng thương hiệu (logo) — dùng làm NỀN, chữ đặt trên phải là màu tối */
  --vang-dam: #8a5c00;       /* vàng sậm — dùng cho chữ, biểu tượng trên nền trắng (tương phản 5,8:1) */
  --vang-nhat: #fbf0d9;      /* vàng rất nhạt — nền khung ghi chú */
  --chu: #1c2b2d;
  --chu-phu: #4f6265;
  --nen: #ffffff;
  --nen-phu: #f4f8f8;
  --vien: #dbe6e6;
  --bong: 0 1px 2px rgba(28, 43, 45, .06), 0 8px 24px rgba(28, 43, 45, .06);
  --bo-goc: 16px;
  --rong: 1180px;
}

/* --mau: chữ/biểu tượng trên nền trắng · --mau-nen + --mau-tren: khối tô đặc và chữ trên nó ·
   --mau-nhat + --mau-tren-nhat: nền tiêu đề thẻ và chữ trên nó */
[data-cong] { --mau-nen: var(--mau); --mau-tren: #fff; --mau-tren-nhat: var(--mau); }
[data-cong="sale-ctv"] { --mau: var(--vang-dam); --mau-nhat: var(--vang); --mau-nen: var(--vang); --mau-tren: var(--chu); --mau-tren-nhat: var(--chu); }
[data-cong="chu-nha"]  { --mau: var(--chu-dao); --mau-nhat: var(--chu-dao-nhat); }

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 88px; }
body {
  margin: 0;
  font-family: "Be Vietnam Pro", system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--chu);
  background: var(--nen);
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: var(--chu-dao); }
a:hover { color: #005b5e; }
h1, h2, h3, h4 { line-height: 1.25; margin: 0; letter-spacing: -.01em; }
p { margin: 0; }
:focus-visible { outline: 3px solid var(--vang-dam); outline-offset: 2px; border-radius: 6px; }
.loi-moi :focus-visible { outline-color: var(--vang); }

/* Chia dòng: tiêu đề cân đối, đoạn văn tránh dòng cuối lẻ chữ (kèm hàm chu() trong ung-dung.js) */
h1, h2, h3, .the-doi-tuong__cau, .buoc a, .buoc__moc, summary span { text-wrap: balance; }
p, li, .the-doi-tuong__mo-ta, .buoc__phu, .ghi-chu div, .the-mua__ds span { text-wrap: pretty; }
main:focus { outline: none; }

.khung { max-width: var(--rong); margin: 0 auto; padding: 0 24px; }
@media (max-width: 640px) { .khung { padding: 0 16px; } }

.bo-qua {
  position: absolute; left: 16px; top: -60px; z-index: 100;
  background: var(--chu); color: #fff; padding: 10px 16px; border-radius: 8px; text-decoration: none;
}
.bo-qua:focus { top: 12px; color: #fff; }

/* ---------- Dải bản dựng ---------- */
.dai-ban-dung {
  background: var(--vang); color: var(--chu);
  border-bottom: 1px solid #d99c3b; font-size: 14px;
}
.dai-ban-dung .khung { display: flex; gap: 10px; align-items: center; min-height: 40px; padding-top: 6px; padding-bottom: 6px; }
.dai-ban-dung svg { flex: none; color: var(--chu); }
.dai-ban-dung a { color: var(--chu); }

/* ---------- Đầu trang ---------- */
.dau-trang {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, .96);
  backdrop-filter: saturate(1.4) blur(8px);
  border-top: 4px solid var(--chu-dao-sang);
  border-bottom: 1px solid var(--vien);
}
.dau-trang__trong { display: flex; align-items: center; gap: 24px; min-height: 72px; }
.logo { display: flex; align-items: center; flex: none; }
.logo img { height: 48px; width: auto; }
.dieu-huong { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.dieu-huong a {
  color: var(--chu); text-decoration: none; font-weight: 600; font-size: 15px;
  padding: 10px 12px; border-radius: 10px;
}
.dieu-huong a:hover { background: var(--nen-phu); color: var(--chu); }
.dieu-huong a[aria-current="page"] { color: var(--chu-dao); background: var(--chu-dao-nhat); }
.dau-trang__nut { display: flex; gap: 8px; align-items: center; }
.nut-menu {
  display: none; margin-left: auto; width: 44px; height: 44px; border-radius: 10px;
  border: 1px solid var(--vien); background: #fff; color: var(--chu); cursor: pointer;
  align-items: center; justify-content: center;
}
@media (max-width: 1020px) {
  .nut-menu { display: inline-flex; }
  .dau-trang__trong { flex-wrap: wrap; gap: 12px; }
  .dieu-huong, .dau-trang__nut { display: none; width: 100%; }
  .dau-trang.mo .dieu-huong { display: flex; flex-direction: column; align-items: stretch; margin: 0; padding-bottom: 8px; }
  .dau-trang.mo .dau-trang__nut { display: flex; padding-bottom: 16px; }
  .dau-trang.mo .dau-trang__nut .nut { flex: 1; }
  .dieu-huong a { padding: 12px; }
}

/* ---------- Nút ---------- */
.nut {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 44px; padding: 10px 18px; border-radius: 12px;
  font: inherit; font-weight: 700; font-size: 15px; text-decoration: none; cursor: pointer;
  border: 1.5px solid var(--chu-dao); background: var(--chu-dao); color: #fff;
  transition: background .15s, border-color .15s, color .15s;
}
.nut:hover { background: #005f62; border-color: #005f62; color: #fff; }
.nut--vien { background: #fff; color: var(--chu-dao); }
.nut--vien:hover { background: var(--chu-dao-nhat); color: #005f62; }
.nut--sang { background: #fff; color: var(--chu-dao); border-color: #fff; }
.nut--sang:hover { background: var(--chu-dao-nhat); color: #005f62; border-color: var(--chu-dao-nhat); }
.nut--trong-suot { background: transparent; color: #fff; border-color: rgba(255,255,255,.6); }
.nut--trong-suot:hover { background: rgba(255,255,255,.12); color: #fff; border-color: #fff; }
.nut--rong { width: 100%; }

/* ---------- Mở đầu trang chủ ---------- */
.mo-dau { background: var(--nen); border-bottom: 1px solid var(--vien); }
.mo-dau__trong {
  display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr); gap: 48px;
  align-items: center; padding-top: 64px; padding-bottom: 72px;
}
.mo-dau__nhan {
  display: inline-flex; align-items: center; gap: 8px; font-size: 14px; font-weight: 700;
  color: var(--chu-dao); background: #fff; border: 1px solid var(--vien);
  padding: 6px 12px; border-radius: 999px; margin-bottom: 20px;
}
.mo-dau__nhan::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--vang); }
.mo-dau h1 { font-size: clamp(1.75rem, 2.9vw, 2.5rem); font-weight: 800; letter-spacing: -.025em; }
.mo-dau__dong { display: block; }
.mo-dau h1 em { font-style: normal; color: var(--chu-dao); }
.mo-dau__phu { margin-top: 18px; font-size: 18px; color: var(--chu-phu); max-width: 34em; }
.mo-dau__ds { display: flex; flex-wrap: wrap; gap: 8px 20px; margin: 28px 0 0; padding: 0; list-style: none; color: var(--chu-phu); font-size: 15px; }
.mo-dau__ds li { display: flex; align-items: center; gap: 8px; }
.mo-dau__ds svg { color: var(--chu-dao); flex: none; }

.chon-doi-tuong { display: flex; flex-direction: column; gap: 14px; }
.chon-doi-tuong__tieu-de { font-size: 14px; font-weight: 700; text-transform: uppercase; letter-spacing: .06em; color: var(--chu-phu); }
@media (max-width: 900px) {
  .mo-dau__trong { grid-template-columns: 1fr; gap: 36px; padding-top: 40px; padding-bottom: 48px; }
}

/* ---------- Thẻ đối tượng (chọn cổng) ---------- */
.the-doi-tuong {
  display: grid; grid-template-columns: 52px minmax(0, 1fr) 24px; gap: 16px; align-items: center;
  background: #fff; border: 1.5px solid var(--vien); border-radius: var(--bo-goc);
  padding: 18px 20px; text-decoration: none; color: var(--chu);
  transition: border-color .15s, transform .15s, box-shadow .15s;
}
.the-doi-tuong:hover { border-color: var(--mau); transform: translateY(-2px); box-shadow: var(--bong); color: var(--chu); }
.the-doi-tuong__bieu-tuong {
  width: 52px; height: 52px; border-radius: 14px; display: grid; place-items: center;
  background: var(--mau-nhat); color: var(--mau-tren-nhat);
}
.the-doi-tuong__cau { font-weight: 800; font-size: 17px; }
.the-doi-tuong__ten { font-size: 14px; color: var(--mau); font-weight: 700; margin-top: 2px; }
.the-doi-tuong__mo-ta { font-size: 14px; color: var(--chu-phu); margin-top: 4px; }
.the-doi-tuong__mui-ten { color: var(--mau); }
.the-doi-tuong__cau, .the-doi-tuong__ten, .the-doi-tuong__mo-ta { display: block; }

/* ---------- Mục ---------- */
.muc { padding: 72px 0; }
.muc--nen { background: var(--nen); border-top: 1px solid var(--vien); border-bottom: 1px solid var(--vien); }
.muc__dau { display: flex; align-items: end; justify-content: space-between; gap: 16px 32px; flex-wrap: wrap; margin-bottom: 28px; }
.muc__tieu-de { font-size: clamp(1.5rem, 2.6vw, 2rem); font-weight: 800; color: var(--chu-dao); }
.muc__phu { color: var(--chu-phu); margin-top: 6px; max-width: 42em; }
@media (max-width: 640px) { .muc { padding: 52px 0; } }

/* ---------- Thẻ khoá học ---------- */
.luoi-khoa { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr)); gap: 20px; }
.the-khoa {
  display: flex; flex-direction: column; background: #fff; border: 1px solid var(--vien);
  border-radius: var(--bo-goc); overflow: hidden; text-decoration: none; color: var(--chu);
  transition: border-color .15s, transform .15s, box-shadow .15s;
}
.the-khoa:hover { border-color: var(--mau); transform: translateY(-2px); box-shadow: var(--bong); color: var(--chu); }
.the-khoa__dau {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  background: var(--mau-nhat); color: var(--mau-tren-nhat); padding: 14px 18px; font-size: 13px; font-weight: 700;
}
.the-khoa__dau span { display: flex; align-items: center; gap: 8px; min-width: 0; }
.the-khoa__than { padding: 18px; display: flex; flex-direction: column; gap: 10px; flex: 1; }
.the-khoa__ten { font-size: 17px; font-weight: 700; }
.the-khoa__tom-tat { font-size: 14px; color: var(--chu-phu); }
.the-khoa__chan { margin-top: auto; padding-top: 8px; display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }

.huy-hieu {
  display: inline-flex; align-items: center; gap: 6px; font-size: 12.5px; font-weight: 700;
  padding: 3px 10px; border-radius: 999px; border: 1px solid transparent; white-space: nowrap;
}
.huy-hieu--dang-mo { background: var(--chu-dao-nhat); color: #005f62; }
.huy-hieu--sap-mo { background: #eef1f2; color: #4a5759; }
.huy-hieu--phi { background: var(--vang); color: var(--chu); }
.huy-hieu--mien-phi { background: var(--xanh-nhat-logo); color: #004d50; }
.huy-hieu--de-xuat { background: var(--vang); color: var(--chu); }
.huy-hieu--bat-buoc { background: var(--chu); color: #fff; }
.so-bai { font-size: 13px; color: var(--chu-phu); display: inline-flex; align-items: center; gap: 4px; }

/* ---------- Lộ trình ---------- */
.luoi-lo-trinh { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr)); gap: 20px; }
.luoi-lo-trinh--day { grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr)); }
.lo-trinh { background: #fff; border: 1px solid var(--vien); border-radius: var(--bo-goc); padding: 22px; display: flex; flex-direction: column; gap: 14px; }
.lo-trinh__dau { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.lo-trinh__cong { font-size: 13px; font-weight: 700; color: var(--mau); }
.lo-trinh__ten { font-size: 19px; font-weight: 800; }
.lo-trinh__mo-ta { font-size: 14px; color: var(--chu-phu); }
.buoc { list-style: none; margin: 4px 0 0; padding: 0; display: flex; flex-direction: column; }
.buoc li { position: relative; display: grid; grid-template-columns: 30px minmax(0, 1fr); gap: 12px; padding-bottom: 14px; }
.buoc li:last-child { padding-bottom: 0; }
.buoc li::before {
  content: ""; position: absolute; left: 14px; top: 30px; bottom: 0; width: 2px; background: var(--vien);
}
.buoc li:last-child::before { display: none; }
.buoc__so {
  width: 30px; height: 30px; border-radius: 50%; display: grid; place-items: center;
  background: var(--mau-nen); color: var(--mau-tren); font-size: 13px; font-weight: 800; position: relative;
}
.buoc__so--moc { background: #fff; color: var(--mau); border: 2px dashed var(--mau-nen); }
.buoc a { font-weight: 600; text-decoration: none; color: var(--chu); display: block; padding-top: 3px; }
.buoc a:hover { color: var(--mau); text-decoration: underline; }
.buoc__moc { font-weight: 600; color: var(--mau); padding-top: 3px; font-size: 15px; }
.buoc__phu { display: block; font-size: 13px; color: var(--chu-phu); }

/* ---------- Đặc điểm ---------- */
.luoi-dac-diem { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 20px; }
.dac-diem { padding: 22px; border-radius: var(--bo-goc); background: #fff; border: 1px solid var(--vien); }
.dac-diem svg { color: var(--chu-dao); }
.dac-diem h3 { font-size: 17px; margin: 14px 0 6px; }
.dac-diem p { font-size: 14.5px; color: var(--chu-phu); }
@media (max-width: 960px) { .luoi-dac-diem { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 540px) { .luoi-dac-diem { grid-template-columns: 1fr; } }

/* ---------- Trang cổng ---------- */
.dau-cong { background: var(--nen); border-bottom: 1px solid var(--vien); }
.dau-cong__trong { padding-top: 48px; padding-bottom: 48px; display: grid; grid-template-columns: 72px minmax(0, 1fr); gap: 24px; align-items: start; }
.dau-cong__bieu-tuong { width: 72px; height: 72px; border-radius: 20px; background: var(--mau-nen); color: var(--mau-tren); display: grid; place-items: center; }
.dau-cong__cau { font-size: 15px; font-weight: 700; color: var(--mau); }
.dau-cong h1 { font-size: clamp(1.9rem, 3.6vw, 2.6rem); font-weight: 800; margin-top: 4px; }
.dau-cong__mo-ta { font-size: 18px; color: var(--chu-phu); margin-top: 10px; max-width: 40em; }
.chip-ds { display: flex; flex-wrap: wrap; gap: 8px; margin: 18px 0 0; padding: 0; list-style: none; }
.chip-ds li { display: inline-flex; align-items: center; gap: 6px; background: #fff; border: 1px solid var(--vien); border-radius: 999px; padding: 6px 12px; font-size: 14px; font-weight: 600; }
.chip-ds svg { color: var(--mau); }
@media (max-width: 640px) { .dau-cong__trong { grid-template-columns: 1fr; gap: 16px; } .dau-cong__bieu-tuong { width: 56px; height: 56px; border-radius: 16px; } }

.nhom { margin-top: 44px; }
.nhom:first-child { margin-top: 0; }
.nhom__dau { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; margin-bottom: 16px; }
.nhom__ten { font-size: 21px; font-weight: 800; color: var(--chu-dao); }
.nhom__mo-ta { color: var(--chu-phu); font-size: 15px; }

/* ---------- Ghi chú ---------- */
.ghi-chu { display: grid; grid-template-columns: 24px minmax(0, 1fr); gap: 12px; padding: 16px 18px; border-radius: 14px; font-size: 15px; }
.ghi-chu svg { margin-top: 2px; }
.ghi-chu--thong-tin { background: #fff; border: 1px solid var(--vien); }
.ghi-chu--thong-tin svg { color: var(--mau, var(--chu-dao)); }
.ghi-chu--ban-dung { background: var(--vang-nhat); border: 1px dashed var(--vang); }
.ghi-chu--ban-dung svg { color: var(--vang-dam); }
.ghi-chu strong { display: block; margin-bottom: 2px; }
.cot-ghi-chu { display: flex; flex-direction: column; gap: 12px; margin-bottom: 36px; }
.cot-ghi-chu--chi-tiet { margin: 24px 0 0; }
.than-cong { padding-top: 48px; padding-bottom: 72px; }
.dau-cong__nut { margin-top: 22px; }

/* ---------- Lời mời chủ nhà ---------- */
.loi-moi {
  margin-top: 56px; background: var(--chu-dao); color: #fff; border-radius: 20px;
  padding: 36px; display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 24px; align-items: center;
}
.loi-moi h2 { font-size: 24px; font-weight: 800; }
.loi-moi p { color: #e6f5f5; margin-top: 8px; }
.loi-moi__nut { display: flex; gap: 10px; flex-wrap: wrap; }
@media (max-width: 760px) { .loi-moi { grid-template-columns: 1fr; padding: 28px 22px; } }

/* ---------- Tất cả khoá học ---------- */
.bo-loc { display: flex; flex-direction: column; gap: 12px; margin-bottom: 28px; padding: 18px; background: var(--nen); border: 1px solid var(--vien); border-radius: var(--bo-goc); }
.bo-loc__hang { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.bo-loc__nhan { font-size: 14px; font-weight: 700; color: var(--chu-phu); min-width: 88px; }
@media (max-width: 540px) { .bo-loc__nhan { width: 100%; } }
.chip {
  display: inline-flex; align-items: center; min-height: 38px; padding: 6px 14px; border-radius: 999px;
  border: 1px solid var(--vien); background: #fff; color: var(--chu); font-size: 14px; font-weight: 600; text-decoration: none;
}
.chip:hover { border-color: var(--chu-dao); color: var(--chu-dao); }
.chip[aria-current="true"] { background: var(--chu-dao); color: #fff; border-color: var(--chu-dao); }
.ket-qua { font-size: 14px; color: var(--chu-phu); margin-bottom: 16px; }
.trong { padding: 40px; text-align: center; color: var(--chu-phu); background: var(--nen); border: 1px dashed var(--vien); border-radius: var(--bo-goc); }

/* ---------- Chi tiết khoá ---------- */
.duong-dan { font-size: 14px; color: var(--chu-phu); display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.duong-dan a { color: var(--chu-phu); }
.duong-dan a:hover { color: var(--chu-dao); }
.chi-tiet { padding-top: 40px; padding-bottom: 72px; }
.chi-tiet__luoi {
  display: grid; grid-template-columns: minmax(0, 1fr) 340px; column-gap: 48px; row-gap: 0;
  grid-template-areas: "dau mua" "than mua"; align-items: start; margin-top: 18px;
}
.chi-tiet__dau { grid-area: dau; }
.chi-tiet__than { grid-area: than; }
.the-mua { grid-area: mua; }
.chi-tiet h1 { font-size: clamp(1.7rem, 3.2vw, 2.4rem); font-weight: 800; margin: 12px 0 14px; }
.chi-tiet__huy-hieu { display: flex; flex-wrap: wrap; gap: 8px; }
.chi-tiet__mo-ta { font-size: 17px; color: var(--chu-phu); max-width: 44em; }
.chi-tiet h2 { font-size: 21px; font-weight: 800; margin: 40px 0 14px; color: var(--chu-dao); }
.ds-bai { list-style: none; margin: 0; padding: 0; border: 1px solid var(--vien); border-radius: var(--bo-goc); overflow: hidden; }
.ds-bai li { display: grid; grid-template-columns: 36px minmax(0, 1fr) auto; gap: 12px; align-items: center; padding: 14px 18px; border-top: 1px solid var(--vien); }
.ds-bai li:first-child { border-top: 0; }
.ds-bai__so { width: 30px; height: 30px; border-radius: 8px; background: var(--mau-nhat, var(--chu-dao-nhat)); color: var(--mau-tren-nhat, #005f62); font-weight: 800; font-size: 13px; display: grid; place-items: center; }
.ds-bai svg { color: var(--chu-phu); }

.the-mua {
  position: sticky; top: 96px; background: #fff; border: 1px solid var(--vien); border-radius: 20px;
  box-shadow: var(--bong); overflow: hidden;
}
.the-mua__dau { background: var(--mau-nhat); padding: 22px; }
.the-mua__nhan { font-size: 13px; font-weight: 700; color: var(--mau-tren-nhat); }
.the-mua__gia { font-size: 26px; font-weight: 800; margin-top: 2px; }
.the-mua__gia--nho { font-size: 19px; }
.the-mua__than { padding: 22px; display: flex; flex-direction: column; gap: 16px; }
.the-mua__ds { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 12px; font-size: 15px; }
.the-mua__ds li { display: grid; grid-template-columns: 22px minmax(0, 1fr); gap: 10px; align-items: start; }
.the-mua__ds svg { color: var(--mau); margin-top: 2px; }
.the-mua__chu-thich { font-size: 13px; color: var(--chu-phu); }
@media (max-width: 960px) {
  .chi-tiet__luoi { grid-template-columns: minmax(0, 1fr); grid-template-areas: "dau" "mua" "than"; row-gap: 28px; }
  .the-mua { position: static; }
}

/* ---------- Trang thông tin ---------- */
.trang-tinh { max-width: 780px; padding: 48px 0 80px; }
.trang-tinh h1 { font-size: clamp(1.8rem, 3.4vw, 2.4rem); font-weight: 800; margin: 12px 0 20px; }
.trang-tinh h2 { font-size: 19px; font-weight: 700; margin: 28px 0 8px; color: var(--chu-dao); }
.trang-tinh p, .trang-tinh li { color: #33474a; font-size: 16.5px; }
.trang-tinh ul { padding-left: 22px; margin: 0; }
.trang-tinh .ghi-chu { margin-bottom: 8px; }
.lien-he-ds { list-style: none; padding: 0; margin: 20px 0 0; border: 1px solid var(--vien); border-radius: var(--bo-goc); overflow: hidden; }
.lien-he-ds li { display: grid; grid-template-columns: 140px minmax(0, 1fr); gap: 16px; padding: 14px 18px; border-top: 1px solid var(--vien); }
.lien-he-ds li:first-child { border-top: 0; }
.lien-he-ds span:first-child { color: var(--chu-phu); font-weight: 600; }
@media (max-width: 540px) { .lien-he-ds li { grid-template-columns: 1fr; gap: 2px; } }

.hoi-dap { display: flex; flex-direction: column; gap: 10px; }
.hoi-dap details { border: 1px solid var(--vien); border-radius: 14px; background: #fff; }
.hoi-dap summary { cursor: pointer; padding: 16px 18px; font-weight: 700; list-style: none; display: flex; justify-content: space-between; gap: 12px; align-items: center; min-height: 44px; }
.hoi-dap summary::-webkit-details-marker { display: none; }
.hoi-dap summary svg { flex: none; transition: transform .15s; color: var(--chu-dao); }
.hoi-dap details[open] summary svg { transform: rotate(45deg); }
.hoi-dap details p { padding: 0 18px 16px; color: var(--chu-phu); }

/* ---------- Chân trang ---------- */
.chan-trang { background: var(--nen); border-top: 4px solid var(--chu-dao-sang); padding: 56px 0 0; font-size: 15px; }
.chan-trang__luoi { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 32px; }
.chan-trang__khau-hieu { color: var(--chu-phu); margin-top: 12px; }
.chan-trang h2 { font-size: 14px; text-transform: uppercase; letter-spacing: .06em; color: var(--chu-dao); margin-bottom: 12px; }
.chan-trang ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.chan-trang a { color: var(--chu); text-decoration: none; }
.chan-trang a:hover { color: var(--chu-dao); text-decoration: underline; }
.chan-trang__cty { color: var(--chu-phu); font-size: 14px; line-height: 1.7; }
.chan-trang__cty strong { color: var(--chu); }
.chan-trang__cty strong, .chan-trang__cty span { display: block; }
.chan-trang__cuoi { margin-top: 44px; background: var(--chu-dao); color: #fff; font-size: 13.5px; }
.chan-trang__cuoi .khung { display: flex; justify-content: space-between; gap: 6px 16px; flex-wrap: wrap; padding-top: 14px; padding-bottom: 14px; }
@media (max-width: 900px) { .chan-trang__luoi { grid-template-columns: 1fr 1fr; } }
@media (max-width: 540px) { .chan-trang__luoi { grid-template-columns: 1fr; } }

.khong-thay { padding-top: 96px; padding-bottom: 96px; text-align: center; }
.khong-thay h1 { font-size: 32px; margin-bottom: 12px; }
.khong-thay p { color: var(--chu-phu); margin-bottom: 24px; }

@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }

/* ---------- Để lại thông tin ---------- */
.lien-he-ds .ban-do { display: block; margin-top: 2px; }
.dang-ky { display: grid; grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr); gap: 48px; align-items: start; }
.dang-ky__gioi-thieu .muc__phu { margin-top: 10px; }
.dang-ky__ds { list-style: none; margin: 20px 0 0; padding: 0; display: flex; flex-direction: column; gap: 10px; color: var(--chu-phu); }
.dang-ky__ds li { display: grid; grid-template-columns: 22px minmax(0, 1fr); gap: 10px; }
.dang-ky__ds svg { color: var(--chu-dao); margin-top: 3px; }
.bieu-mau { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px 18px; background: #fff; border: 1px solid var(--vien); border-radius: 20px; padding: 26px; box-shadow: var(--bong); position: relative; }
.bieu-mau .o { display: flex; flex-direction: column; gap: 6px; }
.bieu-mau .o--rong { grid-column: 1 / -1; }
.bieu-mau label { font-size: 14px; font-weight: 600; }
.bieu-mau input[type="text"], .bieu-mau input[type="tel"], .bieu-mau input[type="email"], .bieu-mau select, .bieu-mau textarea {
  font: inherit; font-size: 16px; color: var(--chu); background: #fff; border: 1.5px solid var(--vien); border-radius: 12px;
  min-height: 46px; padding: 10px 12px; width: 100%;
}
.bieu-mau textarea { resize: vertical; min-height: 92px; }
.bieu-mau input:focus, .bieu-mau select:focus, .bieu-mau textarea:focus { outline: none; border-color: var(--chu-dao); box-shadow: 0 0 0 3px var(--chu-dao-nhat); }
.bieu-mau [aria-invalid="true"] { border-color: #b42318; }
.bieu-mau .dong-y { display: grid; grid-template-columns: 22px minmax(0, 1fr); gap: 10px; font-weight: 400; font-size: 14.5px; color: var(--chu-phu); align-items: start; }
.bieu-mau .dong-y input { width: 20px; height: 20px; margin: 2px 0 0; accent-color: var(--chu-dao); }
.bieu-mau__chan { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.bieu-mau__bao { font-size: 14.5px; color: var(--chu-phu); flex: 1; min-width: 200px; }
.bieu-mau__bao--loi { color: #b42318; }
.bieu-mau__bao--xong { color: #005f62; font-weight: 600; }
.trang-dang-ky { margin-top: 24px; }
.bieu-mau .bay { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
@media (max-width: 900px) { .dang-ky { grid-template-columns: 1fr; gap: 24px; } }
@media (max-width: 540px) { .bieu-mau { grid-template-columns: 1fr; padding: 20px; } }

/* Trang cổng: Lộ trình bên trái, Để lại thông tin bên phải */
.lo-trinh-dang-ky { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr); gap: 32px; align-items: start; }
.lo-trinh-dang-ky__ds { display: flex; flex-direction: column; gap: 20px; }
.dang-ky-gon { background: #fff; border: 1px solid var(--vien); border-radius: 22px; overflow: hidden; box-shadow: var(--bong); }
.dang-ky-gon__dau { display: grid; grid-template-columns: 48px minmax(0, 1fr); gap: 16px; align-items: start; padding: 24px 26px; background: var(--mau-nhat); color: var(--chu); }
.dang-ky-gon__bieu-tuong { width: 48px; height: 48px; border-radius: 14px; background: #fff; color: var(--mau); display: grid; place-items: center; }
.dang-ky-gon__ten { font-size: 22px; font-weight: 800; color: var(--mau-tren-nhat); }
.dang-ky-gon__phu { margin-top: 6px; font-size: 15px; color: var(--chu); }
.dang-ky-gon__loi-ich { list-style: none; margin: 12px 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.dang-ky-gon__loi-ich li { display: inline-flex; align-items: center; gap: 6px; background: rgba(255, 255, 255, .85); border-radius: 999px; padding: 5px 12px; font-size: 13.5px; font-weight: 600; color: var(--chu); }
.dang-ky-gon__loi-ich svg { color: var(--mau); }
.bieu-mau--gon { border: 0; border-radius: 0; box-shadow: none; padding: 24px 26px 26px; }
.bieu-mau--gon textarea { min-height: 72px; }
.bieu-mau--gon .bieu-mau__chan { flex-direction: column; align-items: stretch; }
.bieu-mau--gon .bieu-mau__chan .nut { width: 100%; }
@media (min-width: 901px) { .lo-trinh-dang-ky > div:first-child { position: sticky; top: 100px; } }
@media (max-width: 540px) { .dang-ky-gon__dau { grid-template-columns: 1fr; padding: 20px; } .bieu-mau--gon { padding: 20px; } }
@media (max-width: 900px) { .lo-trinh-dang-ky { grid-template-columns: minmax(0, 1fr); } }

/* ---------- Học trên website: đăng nhập, tài khoản, bài học, giấy chứng nhận, quản lý ---------- */
.the-hoc { background: #fff; border: 1px solid var(--vien); border-radius: 20px; padding: 28px; box-shadow: var(--bong); margin-top: 18px; }
.the-hoc--hep { max-width: 520px; margin-left: auto; margin-right: auto; }
.the-hoc h1 { font-size: clamp(1.5rem, 3vw, 1.9rem); font-weight: 800; color: var(--chu-dao); margin: 0 0 8px; }
.the-hoc .muc__phu { margin-bottom: 20px; }
.the-hoc__nut { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.the-hoc__hoac { display: flex; align-items: center; gap: 12px; margin: 20px 0; color: var(--chu-phu); font-size: 14px; }
.the-hoc__hoac::before, .the-hoc__hoac::after { content: ""; flex: 1; height: 1px; background: var(--vien); }
.dn-email, .tk-ten { display: flex; flex-direction: column; gap: 8px; }
.dn-email label, .tk-ten label { font-size: 14px; font-weight: 600; }
.dn-email input, .tk-ten input { font: inherit; font-size: 16px; min-height: 46px; padding: 10px 12px; border: 1.5px solid var(--vien); border-radius: 12px; width: 100%; }
.dn-email input:focus, .tk-ten input:focus { outline: none; border-color: var(--chu-dao); box-shadow: 0 0 0 3px var(--chu-dao-nhat); }
.dn-email .nut { margin-top: 6px; }
#dn-bao { margin-top: 14px; }
.tai-khoan { display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr); gap: 32px; align-items: start; }
.tai-khoan > div:last-child h2:first-child { margin-top: 18px; }
.tk-ten__hang { display: flex; gap: 8px; }
.tk-ten__hang .nut { flex: none; }
@media (max-width: 900px) { .tai-khoan { grid-template-columns: minmax(0, 1fr); } }

.ds-tien-do { display: flex; flex-direction: column; gap: 10px; }
.tien-do { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 6px 14px; padding: 14px 16px; border: 1px solid var(--vien); border-radius: 14px; text-decoration: none; color: var(--chu); }
.tien-do:hover { border-color: var(--chu-dao); color: var(--chu); }
.tien-do__ten { font-weight: 700; }
.tien-do__so { font-size: 14px; color: var(--chu-phu); }
.tien-do__thanh { grid-column: 1 / -1; height: 8px; border-radius: 999px; background: var(--chu-dao-nhat); overflow: hidden; }
.tien-do__thanh span { display: block; height: 100%; background: var(--chu-dao); border-radius: 999px; }
.ds-chung-nhan { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.ds-chung-nhan li { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 6px 12px; padding: 12px 16px; border: 1px solid var(--vien); border-radius: 12px; }
.ds-chung-nhan a { display: inline-flex; gap: 8px; align-items: center; font-weight: 700; text-decoration: none; }
.ds-chung-nhan__ma { font-size: 13px; color: var(--chu-phu); }

.trinh-phat { margin-bottom: 18px; }
.trinh-phat__khung { position: relative; padding-top: 56.25%; border-radius: 16px; overflow: hidden; background: #0e1a1b; }
.trinh-phat__khung iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.trinh-phat__ten { margin-top: 10px; font-weight: 700; }
.hoc-tien-do { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 10px 16px; padding: 14px 16px; margin-bottom: 14px; border-radius: 14px; background: var(--chu-dao-nhat); font-size: 15px; }
.hoc-tien-do__so { display: inline-flex; align-items: center; gap: 6px; }
.hoc-tien-do svg { color: var(--chu-dao); }
.ds-bai--hoc li { display: block; padding: 0; }
.ds-bai__nut { display: grid; grid-template-columns: 36px minmax(0, 1fr) auto; gap: 12px; align-items: center; width: 100%; padding: 14px 18px; min-height: 52px;
  background: none; border: 0; font: inherit; color: inherit; text-align: left; cursor: pointer; }
.ds-bai__nut:hover { background: var(--nen-phu); }
.ds-bai__nut[aria-current="true"] { background: var(--chu-dao-nhat); font-weight: 700; }
.ds-bai li.da-hoc .ds-bai__so { background: var(--chu-dao); color: #fff; }

.giay-cn { max-width: 860px; margin: 18px auto 0; padding: 48px 56px; background: #fff; text-align: center;
  border: 2px solid var(--chu-dao); outline: 6px solid var(--chu-dao-nhat); outline-offset: -14px; border-radius: 6px; }
.giay-cn__logo { height: 60px; width: auto; margin: 0 auto 18px; }
.giay-cn__loai { font-size: 15px; font-weight: 800; letter-spacing: .16em; text-transform: uppercase; color: var(--chu-dao); }
.giay-cn__nho { color: var(--chu-phu); margin-top: 14px; }
.giay-cn__ten { font-size: clamp(1.8rem, 4.5vw, 2.8rem); font-weight: 800; margin-top: 6px; color: var(--chu); }
.giay-cn__khoa { font-size: clamp(1.1rem, 2.6vw, 1.5rem); font-weight: 700; color: var(--chu-dao); margin-top: 6px; }
.giay-cn__chan { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; margin-top: 36px; padding-top: 20px; border-top: 1px solid var(--vien); }
.giay-cn__chan span { display: block; font-size: 13px; color: var(--chu-phu); }
.giay-cn__chan strong { display: block; margin-top: 2px; }
.giay-cn__tra-cuu { margin-top: 22px; font-size: 13px; color: var(--chu-phu); word-break: break-all; }
.giay-cn__luu-y { margin-top: 8px; font-size: 12.5px; color: var(--chu-phu); }
.giay-cn__nut { text-align: center; margin-top: 20px; }
@media (max-width: 640px) { .giay-cn { padding: 32px 20px; } .giay-cn__chan { grid-template-columns: minmax(0, 1fr); } }

.ql-dau { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 10px; margin: 12px 0; }
.ql-dau .ket-qua { margin: 0; }
.bang-cuon { overflow-x: auto; border: 1px solid var(--vien); border-radius: 14px; }
.bang-ql { width: 100%; border-collapse: collapse; font-size: 14.5px; min-width: 720px; }
.bang-ql th, .bang-ql td { padding: 10px 14px; border-bottom: 1px solid var(--vien); text-align: left; vertical-align: top; }
.bang-ql th { background: var(--chu-dao-nhat); color: #005f62; font-weight: 700; }
.bang-ql tr:last-child td { border-bottom: 0; }

@media print {
  .dau-trang, .chan-trang, .dai-ban-dung, .duong-dan, .giay-cn__nut, .bo-qua { display: none !important; }
  body { background: #fff; }
  .chi-tiet { padding: 0; }
  .giay-cn { margin: 0 auto; box-shadow: none; }
}

.dang-ky-gon__mo { margin-top: 16px; }
.dang-ky-gon:has(.bieu-mau[hidden]) .dang-ky-gon__dau { padding-bottom: 26px; }
.bieu-mau[hidden] { display: none; }

.an-chu { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.ql-the-so { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; margin: 16px 0 8px; }
.ql-the-so div { border: 1px solid var(--vien); border-radius: 14px; padding: 16px 18px; background: #fff; }
.ql-the-so strong { display: block; font-size: 28px; font-weight: 800; color: var(--chu-dao); }
.ql-the-so span { font-size: 14px; color: var(--chu-phu); }
.ql-tim input { font: inherit; font-size: 15px; min-height: 42px; padding: 8px 12px; border: 1.5px solid var(--vien); border-radius: 12px; width: min(340px, 100%); }
.ql-tim { flex: 1; }
.bang-ql--hep { min-width: 520px; }
.ql-thao-tac { white-space: nowrap; }
.ql-thao-tac a { margin-right: 12px; }
.ql-thu-hoi { font: inherit; font-size: 14px; color: #b42318; background: none; border: 1px solid #f1b5ae; border-radius: 8px; padding: 4px 10px; cursor: pointer; min-height: 32px; }
.ql-thu-hoi:hover { background: #fdecea; }
@media (max-width: 540px) { .ql-the-so { grid-template-columns: minmax(0, 1fr); } }
.ql-form { display: flex; flex-wrap: wrap; gap: 10px 12px; align-items: flex-end; margin: 10px 0; }
.ql-form label { display: flex; flex-direction: column; gap: 4px; font-size: 14px; font-weight: 600; }
.ql-form input, .ql-form select, .bang-ql input { font: inherit; font-size: 15px; min-height: 40px; padding: 7px 10px; border: 1.5px solid var(--vien); border-radius: 10px; background: #fff; }
.ql-form input[type="email"] { width: min(320px, 100%); }
.bang-ql input { width: 100%; min-width: 180px; }
.ql-the-khoa { display: inline-flex; align-items: center; gap: 6px; margin: 2px 8px 2px 0; padding: 3px 4px 3px 10px; border-radius: 999px; background: var(--chu-dao-nhat); font-size: 13.5px; }
.ql-go { font: inherit; font-size: 13px; color: #b42318; background: #fff; border: 1px solid #f1b5ae; border-radius: 999px; padding: 2px 9px; cursor: pointer; }
.nut--cho { background: var(--nen-phu); color: var(--chu-phu); border-color: var(--vien); cursor: default; }
.nut--cho:hover { background: var(--nen-phu); color: var(--chu-phu); border-color: var(--vien); }

/* ---------- Thành viên HiFriendz ---------- */
.dau-tv { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 18px; align-items: center; margin-top: 18px; padding: 24px 28px;
  border-radius: 20px; background: var(--chu-dao); color: #fff; }
.dau-tv h1, .dau-tv__nhan { margin: 0 0 6px; font-size: clamp(1.5rem, 3vw, 2rem); font-weight: 800; color: #fff; }
.dau-tv__nhan { font-size: 1.15rem; }
.dau-tv p { margin: 0; color: #e6f5f5; max-width: 62ch; }
.dau-tv__bieu-tuong { display: inline-flex; align-items: center; justify-content: center; width: 60px; height: 60px; border-radius: 16px;
  background: var(--vang); color: var(--chu); }
@media (max-width: 540px) { .dau-tv { grid-template-columns: minmax(0, 1fr); padding: 22px 20px; } .dau-tv__bieu-tuong { width: 48px; height: 48px; } }
.dau-tv + .the-hoc, .dau-tv + .ghi-chu { margin-top: 18px; }
.chi-tiet .dau-tv ~ h2 { margin-top: 28px; }
.huy-hieu--tv { display: inline-flex; align-items: center; gap: 5px; background: var(--chu-dao); color: #fff; }
.ql-the-khoa--tv { background: var(--vang-nhat); }
.ql-form textarea { font: inherit; font-size: 15px; padding: 8px 10px; border: 1.5px solid var(--vien); border-radius: 10px; background: #fff; resize: vertical; width: 100%; }
.ql-cap-email { flex: 1 1 320px; }
.ql-rong { flex: 1 1 100%; }
.ql-form--tv label:not(.ql-rong) { flex: 1 1 180px; }
.ql-form--tv .ql-thu-hoi { min-height: 40px; }