:root {
  --nen: #f6f7f9; --the: #ffffff; --chu: #1b1f24; --mo: #5b6470; --vien: #dfe3e8;
  --chinh: #0b6bcb; --chinh-dam: #0957a6; --nhan: #e8f1fb; --tot: #18794e;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root { --nen: #111418; --the: #1a1e24; --chu: #e8eaed; --mo: #a0a8b3; --vien: #2c323a;
    --chinh: #5aa7f2; --chinh-dam: #8cc2f6; --nhan: #1c2a3a; --tot: #4cc38a; color-scheme: dark; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--nen); color: var(--chu); font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
a { color: var(--chinh); }
.dau { position: sticky; top: 0; z-index: 10; background: var(--the); border-bottom: 1px solid var(--vien); }
.dau .khung { padding: 8px 16px; }
.dau h1 { margin: 0; font-size: inherit; }
.ve-nha { display: flex; align-items: center; gap: 8px; text-decoration: none; }
.nha { flex: none; font-size: clamp(24px, 7vw, 34px); line-height: 1; }
.cach { height: 10px; }
.khung { max-width: 760px; margin: 0 auto; padding: 16px; }
h1 { font-size: 26px; line-height: 1.25; margin: 12px 0 6px; }
h2 { font-size: 20px; margin: 28px 0 8px; }
.gioi-thieu { color: var(--mo); margin: 0 0 16px; }
.the { background: var(--the); border: 1px solid var(--vien); border-radius: 12px; padding: 16px; }
label { display: block; font-weight: 600; font-size: 14px; margin: 12px 0 4px; }
label:first-child { margin-top: 0; }
input, select, textarea { width: 100%; font: inherit; padding: 10px 12px; border: 1px solid var(--vien); border-radius: 8px; background: var(--nen); color: var(--chu); }
input:focus, select:focus, textarea:focus { outline: 2px solid var(--chinh); outline-offset: -1px; }
.hang { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 0 12px; }
.chon { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 4px; }
.chon label { font-weight: 400; margin: 0; display: flex; gap: 6px; align-items: center; }
.chon input { width: auto; }
button { font: inherit; font-weight: 600; border: 0; border-radius: 8px; padding: 10px 16px; background: var(--chinh); color: #fff; cursor: pointer; margin-top: 14px; }
button.phu { background: var(--nhan); color: var(--chinh-dam); }
.ket-qua { margin-top: 16px; background: var(--nhan); border-radius: 10px; padding: 14px; }
.ket-qua:empty { display: none; }
.ket-qua .lon { font-size: 20px; font-weight: 700; }
.ket-qua .nho { color: var(--mo); font-size: 14px; }
.cuon { overflow-x: auto; margin-top: 12px; }
table { border-collapse: collapse; width: 100%; font-size: 14px; font-variant-numeric: tabular-nums; }
th, td { padding: 6px 8px; border-bottom: 1px solid var(--vien); text-align: right; white-space: nowrap; }
th:first-child, td:first-child { text-align: left; }
.luoi { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 10px; }
/* Mỗi ô có màu riêng (--mau đặt trong make.js): viền trái, nền biểu tượng và tên. */
.luoi .o { position: relative; }
.luoi a { --mau: var(--chinh); display: block; text-decoration: none; color: var(--chu); background: var(--the); border: 1px solid var(--vien); border-left: 4px solid var(--mau); border-radius: 12px; padding: 10px 76px 10px 12px; }
/* Nút Tải xanh dương bên phải mỗi ô: tạo lối tắt riêng cho đúng trò đó. */
.luoi a.tai { position: absolute; right: 12px; top: 50%; transform: translateY(-50%); padding: 7px 14px; border: 0; border-radius: 999px; background: #1c7ed6; color: #fff; font-size: 14px; font-weight: 700; line-height: 1; }
.luoi a .dong { display: flex; align-items: center; gap: 8px; }
.luoi a b { color: var(--mau); font-size: 16px; line-height: 1.2; }
.luoi a .bieu-tuong { flex: none; display: grid; place-items: center; width: 34px; height: 34px; border-radius: 10px; font-style: normal; font-size: 20px; line-height: 1; background: color-mix(in srgb, var(--mau) 16%, transparent); }
.luoi a .bieu-tuong img { width: 26px; height: 26px; object-fit: contain; }
.luoi a small { display: block; color: var(--mo); font-size: 13px; line-height: 1.35; margin-top: 4px; }
.tieu-de-chinh { display: block; white-space: nowrap; font-size: clamp(26px, 7.5vw, 40px); font-weight: 800; line-height: 1.15; text-decoration: none;
  background: linear-gradient(90deg, #e03131, #f08c00, #9c36b5); -webkit-background-clip: text; background-clip: text; color: transparent; }
.noi-dung p, .noi-dung li { color: var(--chu); }
.chan { color: var(--mo); font-size: 13px; border-top: 1px solid var(--vien); margin-top: 32px; }
/* Nút chia sẻ mũi tên cong ở góc phải thanh trên cùng. */
.dau .khung { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.dau .chia-se { flex: none; display: grid; place-items: center; width: 40px; height: 40px; margin: 0; padding: 0; border-radius: 50%; background: var(--nhan); color: #1c7ed6; }