/* Website Trai Giong Phuc Vinh. Mau o :root; dien thoai truoc, may tinh >= 860px */
:root {
  --nen: #fbf7ef; --nen-2: #f3ecdd; --the: #ffffff; --chu: #1f2a1f; --mo: #5f6b5c; --vien: #e4dccb;
  --xanh: #2f6b2f; --xanh-dam: #1f4d22; --xanh-nhat: #e3efdc; --cam: #e06a12; --cam-dam: #b9530a; --vang: #fff3bf;
  --bo: 14px; --bong: 0 6px 20px rgba(31, 42, 31, .08);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--nen); color: var(--chu); font: 16px/1.6 'Be Vietnam Pro', system-ui, -apple-system, 'Segoe UI', sans-serif; padding-bottom: 72px; }
img { max-width: 100%; display: block; }
a { color: var(--xanh); }
h1, h2, h3 { line-height: 1.25; margin: 0 0 .5em; }
h1 { font-size: clamp(28px, 7vw, 46px); font-weight: 800; letter-spacing: -.5px; }
h2 { font-size: clamp(23px, 5vw, 32px); font-weight: 800; }
h3 { font-size: 18px; font-weight: 700; }
p { margin: 0 0 1em; }
.khung { max-width: 1080px; margin: 0 auto; padding: 0 16px; }
.muc { padding: 44px 0; }
.muc.nen-2 { background: var(--nen-2); }
.tieu-de-muc { text-align: center; max-width: 640px; margin: 0 auto 26px; }
.tieu-de-muc p { color: var(--mo); }
.nhan { display: inline-block; font-size: 13px; font-weight: 700; color: var(--xanh); background: var(--xanh-nhat); border-radius: 99px; padding: 3px 12px; margin-bottom: 10px; }

/* Dau trang */
.dau { position: sticky; top: 0; z-index: 20; background: rgba(251, 247, 239, .95); backdrop-filter: blur(6px); border-bottom: 1px solid var(--vien); }
.dau .khung { display: flex; align-items: center; justify-content: space-between; height: 60px; gap: 12px; }
.logo { display: flex; align-items: center; gap: 9px; text-decoration: none; color: var(--chu); font-weight: 800; font-size: 17px; line-height: 1.1; }
.logo small { display: block; font-weight: 500; font-size: 12px; color: var(--mo); }
.logo .bieu-tuong { width: 38px; height: 38px; border-radius: 10px; background: var(--xanh); color: #fff; display: grid; place-items: center; font-size: 20px; }
.menu { display: none; gap: 20px; font-size: 15px; font-weight: 600; }
.menu a { text-decoration: none; color: var(--chu); }
.menu a:hover { color: var(--xanh); }
.goi-dau { text-decoration: none; font-weight: 700; color: #fff; background: var(--cam); padding: 8px 14px; border-radius: 99px; font-size: 14px; white-space: nowrap; }

/* Nut */
.nut { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 50px; padding: 12px 22px; border-radius: 12px; border: 0;
  font: inherit; font-weight: 700; font-size: 17px; text-decoration: none; cursor: pointer; transition: transform .1s, background .15s; }
.nut:active { transform: scale(.98); }
.nut-chinh { background: var(--cam); color: #fff; box-shadow: 0 4px 14px rgba(224, 106, 18, .3); }
.nut-chinh:hover { background: var(--cam-dam); }
.nut-phu { background: var(--the); color: var(--xanh-dam); border: 2px solid var(--xanh); }
.nut-rong { width: 100%; }

/* Dau trang chinh */
.anh-bia { position: relative; background: var(--xanh-dam); color: #fff; overflow: hidden; }
.anh-bia > img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; opacity: .38; }
.anh-bia .khung { position: relative; padding-top: 48px; padding-bottom: 48px; }
.anh-bia p.lon { font-size: 18px; max-width: 560px; color: #eef5ea; }
.anh-bia .nhan { background: rgba(255, 255, 255, .16); color: #fff; }
.hang-nut { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.hang-nut .nut { flex: 1 1 200px; }
.diem-nhanh { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; margin-top: 26px; padding: 0; list-style: none; font-size: 15px; }
.diem-nhanh li { background: rgba(255, 255, 255, .12); border-radius: 10px; padding: 9px 12px; }

/* The */
.luoi { display: grid; gap: 14px; }
.the { background: var(--the); border: 1px solid var(--vien); border-radius: var(--bo); padding: 20px; box-shadow: var(--bong); }
.the .so-to { font-size: 30px; font-weight: 800; color: var(--xanh-dam); }

/* Bang gia */
.goi { position: relative; text-align: center; }
.goi.noi-bat { border: 2px solid var(--cam); }
.goi .cham-noi { position: absolute; top: -12px; left: 50%; transform: translateX(-50%); background: var(--cam); color: #fff; font-size: 13px; font-weight: 700; padding: 2px 12px; border-radius: 99px; white-space: nowrap; }
.goi .so-con { font-size: 22px; font-weight: 800; }
.goi .gia { font-size: 32px; font-weight: 800; color: var(--cam-dam); margin: 4px 0; }
.goi .moi-con { color: var(--mo); font-size: 14px; }
.goi ul { text-align: left; padding-left: 20px; margin: 14px 0 18px; font-size: 15px; }

/* Anh trai */
.luoi-anh { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; }
.luoi-anh figure { margin: 0; border-radius: 12px; overflow: hidden; background: var(--vien); aspect-ratio: 1; }
.luoi-anh img { width: 100%; height: 100%; object-fit: cover; }
.luoi-anh figure.rong { grid-column: span 2; aspect-ratio: 2 / 1; }

/* Video doc (quay dien thoai): cuon ngang tren dien thoai, luoi tren may tinh */
.luoi-video { display: grid; grid-auto-flow: column; grid-auto-columns: 62%; gap: 10px; overflow-x: auto; scroll-snap-type: x mandatory; padding-bottom: 6px; }
.luoi-video figure { margin: 0; scroll-snap-align: start; }
.luoi-video video { width: 100%; aspect-ratio: 9 / 16; object-fit: cover; border-radius: 14px; background: #000; display: block; }
.luoi-video figcaption { font-size: 14px; font-weight: 600; margin-top: 6px; text-align: center; }
.buoc.moc li::before { content: '🪿'; background: var(--xanh-nhat); font-size: 18px; }

/* Cac buoc */
.buoc { counter-reset: b; list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; }
.buoc li { counter-increment: b; position: relative; padding: 16px 16px 16px 64px; background: var(--the); border: 1px solid var(--vien); border-radius: var(--bo); }
.buoc li::before { content: counter(b); position: absolute; left: 16px; top: 16px; width: 34px; height: 34px; border-radius: 50%; background: var(--xanh); color: #fff; font-weight: 800; display: grid; place-items: center; }
.buoc b { display: block; }

/* Hoi dap */
details.hd { background: var(--the); border: 1px solid var(--vien); border-radius: 12px; padding: 0 16px; margin-bottom: 10px; }
details.hd summary { cursor: pointer; font-weight: 700; padding: 14px 0; list-style: none; position: relative; padding-right: 28px; }
details.hd summary::-webkit-details-marker { display: none; }
details.hd summary::after { content: '+'; position: absolute; right: 2px; top: 10px; font-size: 22px; color: var(--xanh); }
details.hd[open] summary::after { content: '–'; }
details.hd > div { padding-bottom: 14px; color: #34402f; }

/* Form dat hang */
.form-dat { background: var(--the); border-radius: 18px; padding: 22px 18px; box-shadow: var(--bong); border: 2px solid var(--xanh); }
.form-dat h2 { margin-bottom: 4px; }
.form-dat .phu-de { color: var(--mo); margin-bottom: 16px; }
.o { margin-bottom: 14px; }
.o label { display: block; font-weight: 700; margin-bottom: 6px; }
.o label .tuy { font-weight: 400; color: var(--mo); font-size: 14px; }
.o input, .o textarea { width: 100%; font: inherit; font-size: 17px; padding: 12px 14px; border: 1.5px solid var(--vien); border-radius: 10px; background: #fff; color: var(--chu); }
.o input:focus, .o textarea:focus { outline: 0; border-color: var(--xanh); box-shadow: 0 0 0 3px var(--xanh-nhat); }
.chon-goi { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; }
.chon-goi label { margin: 0; font-weight: 600; border: 1.5px solid var(--vien); border-radius: 10px; padding: 10px; cursor: pointer; text-align: center; line-height: 1.3; background: #fff; }
.chon-goi label small { display: block; font-weight: 500; color: var(--mo); font-size: 13px; }
.chon-goi input { position: absolute; opacity: 0; pointer-events: none; }
.chon-goi input:checked + span { color: var(--xanh-dam); }
.chon-goi label:has(input:checked) { border-color: var(--xanh); background: var(--xanh-nhat); box-shadow: 0 0 0 2px var(--xanh) inset; }
.chon-goi input:focus-visible + span { outline: 2px solid var(--xanh); outline-offset: 2px; }
.o-bay { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.bao-loi { color: #b42318; font-weight: 600; margin: 0 0 12px; min-height: 0; }
.cam-on { text-align: center; padding: 10px 0; }
.cam-on .dau-tich { width: 64px; height: 64px; border-radius: 50%; background: var(--xanh); color: #fff; font-size: 34px; display: grid; place-items: center; margin: 0 auto 12px; }
.nho-mo { font-size: 14px; color: var(--mo); }

/* Bai viet */
.bai { max-width: 760px; }
.bai h2 { margin-top: 1.4em; }
.bai ul, .bai ol { padding-left: 22px; }
.bai li { margin-bottom: .4em; }
.hop-nhac { background: var(--xanh-nhat); border-left: 4px solid var(--xanh); border-radius: 10px; padding: 14px 16px; margin: 18px 0; }

/* Chan trang + thanh duoi */
.chan { background: var(--xanh-dam); color: #d9e6d4; padding: 34px 0 24px; font-size: 15px; }
.chan a { color: #fff; }
.chan .luoi { gap: 20px; }
.chan h3 { color: #fff; }
.thanh-duoi { position: fixed; left: 0; right: 0; bottom: 0; z-index: 30; display: grid; grid-template-columns: 1fr 1fr 1.4fr; gap: 6px; padding: 8px; background: #fff; border-top: 1px solid var(--vien); box-shadow: 0 -4px 16px rgba(0, 0, 0, .06); }
.thanh-duoi a { display: flex; flex-direction: column; align-items: center; justify-content: center; min-height: 48px; border-radius: 10px; text-decoration: none; font-weight: 700; font-size: 14px; color: var(--xanh-dam); background: var(--xanh-nhat); }
.thanh-duoi a.dat { background: var(--cam); color: #fff; font-size: 16px; }

/* Ban thu: cho can Sep xac nhan to vang (bo data-ban-thu khi chay that) */
[data-ban-thu] .can-xn { background: var(--vang); outline: 2px dashed #e0b400; outline-offset: 2px; border-radius: 4px; }
[data-ban-thu] .can-xn::after { content: ' ⟵ Sếp xác nhận'; font-size: 12px; font-weight: 700; color: #8a6d00; }
.bang-thu { display: none; }
[data-ban-thu] .bang-thu { display: block; background: #fff3bf; color: #5c4700; text-align: center; font-size: 13px; padding: 6px 12px; }

@media (min-width: 860px) {
  body { padding-bottom: 0; }
  .menu { display: flex; }
  .thanh-duoi { display: none; }
  .muc { padding: 64px 0; }
  .anh-bia .khung { padding-top: 84px; padding-bottom: 84px; }
  .diem-nhanh { grid-template-columns: repeat(4, 1fr); }
  .luoi.c2 { grid-template-columns: 1fr 1fr; }
  .luoi.c3 { grid-template-columns: repeat(3, 1fr); }
  .luoi.c4 { grid-template-columns: repeat(4, 1fr); }
  .luoi-anh { grid-template-columns: repeat(4, 1fr); }
  .luoi-video { grid-auto-flow: row; grid-template-columns: repeat(5, 1fr); overflow: visible; }
  .buoc { grid-template-columns: repeat(4, 1fr); }
  .buoc li { padding: 62px 16px 16px; }
  .chia-doi { display: grid; grid-template-columns: 1.1fr .9fr; gap: 40px; align-items: start; }
  .chan .luoi { grid-template-columns: 2fr 1fr 1fr; }
}