html { scroll-padding-top: calc(var(--cao-dau) + 16px); }
/* ---------- chuyển trang mượt (Chrome / Edge) ---------- */
@view-transition { navigation: auto; }
::view-transition-old(root) { animation: hu-mo-ra .22s ease both; }
::view-transition-new(root) { animation: hu-hien-vao .32s ease both; }
@keyframes hu-mo-ra { to { opacity: 0; } }
@keyframes hu-hien-vao { from { opacity: 0; transform: translateY(8px); } }

/* ---------- thanh tiến độ cuộn ---------- */
.hu-thanh-cuon { position: fixed; left: 0; top: 0; right: 0; height: 2px; z-index: 90; background: var(--chuyen); transform-origin: 0 50%; transform: scaleX(var(--cuon, 0)); pointer-events: none; }

/* ---------- header: thu gọn khi cuộn ---------- */
.dau__trong { transition: height .3s ease; }
.dau__logo img { height: 54px; width: auto; transition: height .3s ease, transform .3s ease; }
.dau.is-cuon .dau__trong { height: 64px; }
.dau.is-cuon .dau__logo img { height: 44px; }
.dau.is-cuon { background: rgba(255, 255, 255, .86); }

/* ---------- lớp nền trang trí ---------- */
.hu-cha { position: relative; isolation: isolate; overflow: hidden; }
.hu-cha > .khung { position: relative; z-index: 1; }
.hu-nen { position: absolute; inset: 0; z-index: 0; pointer-events: none; overflow: hidden; }
.hu-khoi { position: absolute; inset: -90px; background: url(../imgs/bg/khoi.svg) 0 0 / 52px 90px; opacity: .08;
	-webkit-mask-image: radial-gradient(ellipse 70% 80% at 85% 20%, #000 0%, transparent 70%); mask-image: radial-gradient(ellipse 70% 80% at 85% 20%, #000 0%, transparent 70%);
	animation: hu-khoi-troi 70s linear infinite; }
.hu-dom { position: absolute; border-radius: 50%; filter: blur(70px); opacity: .5; will-change: transform; animation: hu-dom-troi 18s ease-in-out infinite alternate; }
.hu-dom--1 { width: 460px; height: 460px; top: -160px; right: -100px; background: #9fdcf9; }
.hu-dom--2 { width: 340px; height: 340px; bottom: -160px; left: -80px; background: #c9ecff; animation-delay: -7s; animation-duration: 22s; }
.hu-dom--3 { width: 260px; height: 260px; top: 35%; left: 42%; background: #e1f4ff; animation-delay: -3s; animation-duration: 26s; opacity: .4; }
.hu-soi { position: absolute; inset: 0; background: radial-gradient(520px circle at var(--mx, 70%) var(--my, 30%), rgba(54, 197, 245, .16), transparent 62%); transition: background .2s; }
/* nền tối (footer, nhận tin, kêu gọi, khối xanh đậm) */
.hu-nen--toi .hu-khoi { background-image: url(../imgs/bg/khoi-sang.svg); opacity: .1; -webkit-mask-image: radial-gradient(ellipse 60% 90% at 100% 0%, #000, transparent 75%); mask-image: radial-gradient(ellipse 60% 90% at 100% 0%, #000, transparent 75%); }
.hu-nen--toi .hu-dom--1 { background: #0a8fd6; opacity: .45; }
.hu-nen--toi .hu-dom--2 { background: #00b8f0; opacity: .22; }
.hu-nen--toi .hu-dom--3 { display: none; }
.hu-nen--toi .hu-soi { background: radial-gradient(480px circle at var(--mx, 80%) var(--my, 20%), rgba(54, 197, 245, .14), transparent 60%); }
/* nền nhạt (các khối phan--nen): chỉ chấm lưới mờ */
.hu-nen--cham { background-image: radial-gradient(rgba(10, 124, 196, .13) 1px, transparent 1.3px); background-size: 22px 22px;
	-webkit-mask-image: linear-gradient(180deg, transparent, #000 25%, #000 75%, transparent); mask-image: linear-gradient(180deg, transparent, #000 25%, #000 75%, transparent); }
@keyframes hu-khoi-troi { to { transform: translate3d(52px, 90px, 0); } }
@keyframes hu-dom-troi { 0% { transform: translate3d(0, 0, 0) scale(1); } 100% { transform: translate3d(40px, 36px, 0) scale(1.15); } }

/* bỏ vòng tròn trang trí cũ - đã có lớp hiệu ứng mới */
.dau-trang::after, .nhan-tin::after { display: none; }
.dau-trang { background: linear-gradient(180deg, var(--kem), #fff); }
.keu-goi { position: relative; overflow: hidden; isolation: isolate; background: var(--chuyen); }
.keu-goi > * { position: relative; z-index: 1; }
.chan, .nhan-tin { position: relative; }

/* ---------- khối lập phương nổi (giống logo) cạnh ảnh banner ---------- */
.hu-khoi-noi { position: absolute; z-index: 2; width: 74px; height: 74px; pointer-events: none; filter: drop-shadow(0 14px 18px rgba(6, 45, 82, .25)); animation: hu-noi 7s ease-in-out infinite; }
.hu-khoi-noi--1 { left: -30px; bottom: 18%; }
.hu-khoi-noi--2 { right: 14%; top: -26px; width: 52px; height: 52px; animation-delay: -2.5s; animation-duration: 8.5s; }
@keyframes hu-noi { 0%, 100% { transform: translateY(0) rotate(0); } 50% { transform: translateY(-14px) rotate(4deg); } }
.banner__anh { overflow: visible; }
.banner__anh .banner__hinh { border-radius: inherit; }
.banner__anh::before { content: ""; position: absolute; inset: 0; border-radius: inherit; overflow: hidden; z-index: 1; pointer-events: none; background: linear-gradient(180deg, transparent 55%, rgba(6, 45, 82, .25)); }
.banner__anh > .banner__dk, .banner__anh > .banner__the { z-index: 3; }
.banner__khung-anh { position: absolute; inset: 0; border-radius: inherit; overflow: hidden; }

/* ---------- ảnh hiện dần khi tải xong ---------- */
.js img.hu-anh-cho { opacity: 0; transition: opacity .6s ease; }
.js img.hu-anh-cho.is-tai { opacity: 1; }

/* ---------- thẻ hiện dần lần lượt (hieuung.js gắn .hu-len + --i) ---------- */
.js .hu-len { opacity: 0; transform: translateY(22px); transition: opacity .6s ease, transform .6s cubic-bezier(.2, .7, .2, 1); transition-delay: calc(var(--i, 0) * 70ms); }
.js .hu-len.is-thay { opacity: 1; transform: none; }

/* ---------- nút: vệt sáng lướt qua ---------- */
.nut { position: relative; overflow: hidden; isolation: isolate; }
.nut--chinh { background: linear-gradient(135deg, #0a8fd6, var(--mau) 60%, var(--mau-dam)); }
.nut--chinh:hover { background: linear-gradient(135deg, #0a7cc4, var(--mau-dam)); box-shadow: 0 10px 24px -10px rgba(10, 124, 196, .65); }
.nut--chinh::after, .nut--vang::after { content: ""; position: absolute; top: 0; bottom: 0; left: -60%; width: 40%; z-index: -1; background: linear-gradient(100deg, transparent, rgba(255, 255, 255, .35), transparent); transform: skewX(-18deg); transition: left .6s ease; }
.nut--chinh:hover::after, .nut--vang:hover::after { left: 130%; }
.nut--vang { color: #04213b; }
.nut.is-cho { color: transparent !important; }
.nut.is-cho::before { content: ""; position: absolute; left: 50%; top: 50%; width: 18px; height: 18px; margin: -9px 0 0 -9px; border-radius: 50%; border: 2px solid rgba(255, 255, 255, .5); border-top-color: #fff; animation: hu-quay .7s linear infinite; }
.nut--vien.is-cho::before { border-color: rgba(10, 124, 196, .3); border-top-color: var(--mau); }
@keyframes hu-quay { to { transform: rotate(360deg); } }

/* ---------- thẻ: viền sáng theo chuột ---------- */
.the-kg, .the-dd, .the-bv, .dd-the, .loi-ich__the { --mx: 50%; --my: 0%; }
.the-kg::before, .the-dd::before, .dd-the::before { content: ""; position: absolute; inset: 0; z-index: 3; border-radius: inherit; pointer-events: none; opacity: 0; transition: opacity .3s;
	background: radial-gradient(260px circle at var(--mx) var(--my), rgba(54, 197, 245, .16), transparent 65%); }
.the-kg:hover::before, .the-dd:hover::before, .dd-the:hover::before { opacity: 1; }
.the-kg, .the-dd, .dd-the { position: relative; }

/* ---------- hộp thoại: thông báo gửi thành công ngay trong hộp ---------- */
.hop-xong { display: none; text-align: center; padding: 18px 6px 4px; }
.hop-xong .ic { width: 64px; height: 64px; padding: 16px; border-radius: 50%; color: #fff; background: var(--chuyen); margin: 0 auto 16px; display: block; animation: hu-bat .5s cubic-bezier(.2, 1.6, .4, 1) both; }
.hop-xong h4 { font-size: 21px; margin: 0 0 6px; color: var(--muc); }
.hop-xong p { color: var(--mo); margin: 0 0 18px; }
.hop__khung.is-xong .bieu-mau, .hop__khung.is-xong .hop__phu { display: none; }
.hop__khung.is-xong .hop-xong { display: block; }
@keyframes hu-bat { from { transform: scale(.4); opacity: 0; } }

/* ---------- thanh đặt nhanh dưới đáy (điện thoại) ở trang chi tiết ---------- */
.thanh-dat { display: none; }
@media (max-width: 1024px) {
	.thanh-dat { position: fixed; left: 0; right: 0; bottom: 0; z-index: 55; display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 10px 16px calc(10px + env(safe-area-inset-bottom)); background: rgba(255, 255, 255, .96); backdrop-filter: blur(10px); border-top: 1px solid var(--vien); box-shadow: 0 -10px 30px -18px rgba(6, 45, 82, .4); transform: translateY(110%); transition: transform .3s ease; }
	.thanh-dat.is-hien { transform: none; }
	.thanh-dat__gia small { display: block; color: var(--mo); font-size: 12px; }
	.thanh-dat__gia b { color: var(--mau); font-size: 18px; }
	body:has(.thanh-dat.is-hien) .lienhe-nhanh { bottom: 84px; }
}

/* ---------- con số chạy ---------- */
.js-dem { font-variant-numeric: tabular-nums; }

@media (prefers-reduced-motion: reduce) {
	.hu-khoi, .hu-dom, .hu-khoi-noi { animation: none; }
	.js .hu-len, .js img.hu-anh-cho { opacity: 1; transform: none; transition: none; }
	::view-transition-old(root), ::view-transition-new(root) { animation: none; }
}
@media (max-width: 760px) {
	.hu-dom { filter: blur(50px); }
	.hu-dom--1 { width: 300px; height: 300px; }
	.hu-khoi-noi--1 { left: 8px; bottom: -22px; width: 56px; height: 56px; }
	.hu-khoi-noi--2 { display: none; }
}

/* ---------- chỉnh theo bảng màu xanh logo ---------- */
.tim-dv .nut { min-width: 128px; padding: 0 22px; }
.keu-goi p a { color: #fff; text-decoration: underline; text-decoration-color: rgba(255, 255, 255, .45); text-underline-offset: 5px; }
.keu-goi h2 { color: #fff; }
.keu-goi .nut--trang { color: var(--mau-dam); }
.chan__cot > a.chan__logo { display: inline-flex; padding: 0; }
.chan__logo--nen { padding: 10px !important; border-radius: 16px; background: #fff; box-shadow: 0 10px 30px -12px rgba(0, 184, 240, .5); }
.chan__logo--nen img { height: 64px; }

/* =========================================================
   CHÂN TRANG MỚI (librarys/footer.php) + SÓNG
   ========================================================= */
.nhan-tin { padding: 52px 0; background: var(--chuyen); }
.nhan-tin__chu { display: flex; gap: 18px; align-items: center; }
.nhan-tin__ic { flex: 0 0 auto; width: 58px; height: 58px; border-radius: 18px; display: grid; place-items: center; background: rgba(255, 255, 255, .14); border: 1px solid rgba(255, 255, 255, .25); color: #fff; }
.nhan-tin__ic .ic { width: 26px; height: 26px; }
.nhan-tin p { color: #e3f4fd; }
.nhan-tin__form { background: rgba(255, 255, 255, .14); border-color: rgba(255, 255, 255, .3); backdrop-filter: blur(6px); }
.nhan-tin__form input::placeholder { color: #cfeaf9; }

.chan { padding: 56px 0 0; background: var(--toi); overflow: hidden; isolation: isolate; }

.chan > .khung { position: relative; z-index: 1; }
.chan__dau { display: flex; align-items: center; justify-content: space-between; gap: 28px; flex-wrap: wrap; padding-bottom: 34px; margin-bottom: 38px; border-bottom: 1px solid rgba(255, 255, 255, .09); }
.chan__tt { display: flex; align-items: center; gap: 18px; max-width: 520px; }
.chan__tt p { margin: 4px 0 0; color: #9fbdd6; font-size: 14.5px; }
.chan__ten { color: #fff; font-size: 18px; letter-spacing: .02em; }
.chan__logo { margin: 0 !important; flex: 0 0 auto; }
.chan__logo--nen img { height: 56px !important; }
.chan__lien { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.chan__the { display: flex; align-items: center; gap: 12px; padding: 10px 18px 10px 10px; border-radius: 16px; background: rgba(255, 255, 255, .05); border: 1px solid rgba(255, 255, 255, .1); transition: background .25s, border-color .25s, transform .25s; }
.chan__the:hover { background: rgba(54, 197, 245, .12); border-color: rgba(54, 197, 245, .45); transform: translateY(-2px); }
.chan__the .ic { width: 42px; height: 42px; padding: 11px; border-radius: 12px; background: linear-gradient(135deg, #00b8f0, #0a7cc4); color: #fff; }
.chan__the small { display: block; color: #8fb0cf; font-size: 12px; }
.chan__the b { color: #fff; font-size: 16px; }
.chan .chan__mxh { margin: 0; }
.chan__mxh a { width: 42px; height: 42px; border: 1px solid rgba(255, 255, 255, .12); transition: background .25s, transform .25s, color .25s; }
.chan__mxh a:hover { background: #00b8f0; color: #fff; transform: translateY(-3px); }
.chan__luoi { display: grid; grid-template-columns: 1.7fr 1fr 1fr 1fr; gap: 40px; }
.chan h3 { font-size: 13px; letter-spacing: .1em; color: #fff; margin-bottom: 18px; display: flex; align-items: center; gap: 10px; }
.chan h3::before { content: ""; width: 18px; height: 2px; border-radius: 2px; background: #36c5f5; }
.chan__cot > a { position: relative; display: block; padding: 5px 0; color: #c3d8ea; transition: color .2s, transform .2s; }
.chan__cot > a:hover { color: #fff; transform: translateX(4px); }
.chan__vp-luoi { display: grid; grid-template-columns: 1fr 1fr; gap: 6px 22px; }
.chan__tp { display: grid; gap: 4px; align-content: start; }
.chan__tp-ten { color: #36c5f5; font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; margin-bottom: 4px; }
.chan .chan__vp { display: flex; gap: 10px; padding: 8px 10px; margin: 0 -10px; border-radius: 12px; color: #c3d8ea; transition: background .2s; }
.chan .chan__vp:hover { background: rgba(255, 255, 255, .05); color: #fff; }
.chan__vp .ic { color: #36c5f5; margin-top: 3px; }
.chan__vp b { display: block; color: #fff; font-size: 14.5px; font-weight: 600; letter-spacing: 0; margin: 0; }
.chan__vp small { display: block; color: #8fb0cf; font-size: 13px; line-height: 1.5; }
.chan__cuoi { margin-top: 44px; padding: 20px 0; border-top: 1px solid rgba(255, 255, 255, .09); color: #8fb0cf; }
.chan__cuoi a { color: #8fb0cf; }
@media (max-width: 1024px) {
	.chan__luoi { grid-template-columns: 1fr 1fr; }
	.chan__cot--vp { grid-column: 1 / -1; }
}
@media (max-width: 760px) {
	.nhan-tin__chu { align-items: flex-start; }
	.chan__vp-luoi { grid-template-columns: 1fr; }
	.chan__luoi { grid-template-columns: 1fr 1fr; gap: 28px; }
	.chan__lien { width: 100%; }
	.chan__the { flex: 1 1 100%; }
}


/* ---------- nền chuyển động nhẹ cho các khối trang chủ (hieuung.js gắn .hu-nen--nhe) ---------- */
.hu-nen--nhe .hu-dom { opacity: .26; filter: blur(80px); }
.hu-nen--nhe .hu-dom--1 { top: 8%; right: -140px; left: auto; width: 420px; height: 420px; background: #8fd8f8; }
.hu-nen--nhe .hu-dom--2 { bottom: -120px; left: 20%; width: 320px; height: 320px; background: #cdeeff; }
.hu-nen--trai .hu-dom--1 { right: auto; left: -140px; }
.hu-nen--trai .hu-dom--2 { left: auto; right: 18%; }
.hu-tia { position: absolute; top: -40%; bottom: -40%; width: 38%; left: -45%; background: linear-gradient(90deg, transparent, rgba(54, 197, 245, .07), transparent); transform: rotate(14deg); animation: hu-tia-luot 16s ease-in-out infinite; }
.hu-nen--trai .hu-tia { animation-delay: -8s; }
@keyframes hu-tia-luot { 0% { left: -45%; } 55%, 100% { left: 120%; } }
.hu-khoi-vien { position: absolute; width: 150px; height: 150px; right: 4%; top: 12%; background: url(../imgs/bg/khoi-vien.svg) center / contain no-repeat; opacity: .1; animation: hu-khoi-xoay 26s ease-in-out infinite alternate; }
.hu-nen--trai .hu-khoi-vien { right: auto; left: 3%; top: auto; bottom: 10%; width: 110px; height: 110px; animation-duration: 32s; }
@keyframes hu-khoi-xoay { 0% { transform: translateY(0) rotate(-8deg); } 100% { transform: translateY(-26px) rotate(10deg); } }
.hu-nen--cham ~ * { position: relative; }
@media (max-width: 760px) { .hu-khoi-vien { width: 90px; height: 90px; opacity: .07; } }
@media (prefers-reduced-motion: reduce) { .hu-tia, .hu-khoi-vien { animation: none; } }
.chan__luoi { grid-template-columns: 2.1fr 1fr 1fr .9fr; }
.chan__vp-luoi { grid-template-columns: 1fr; gap: 14px; }
.chan__tp { grid-template-columns: 1fr 1fr; column-gap: 18px; }
.chan__tp-ten { grid-column: 1 / -1; }
@media (max-width: 760px) { .chan__tp { grid-template-columns: 1fr; } }
.hu-nen--nhe { -webkit-mask-image: linear-gradient(180deg, transparent 0, #000 90px, #000 calc(100% - 90px), transparent 100%); mask-image: linear-gradient(180deg, transparent 0, #000 90px, #000 calc(100% - 90px), transparent 100%); }


/* ---------- nền chân trang kiểu MTCN: vạch sáng mép trên, lưới mờ, hạt sáng lấp lánh, sóng hạt chấm 3D ở đáy (hieuung.js) ---------- */
.chan::before { content: ""; position: absolute; top: 0; left: 0; right: 0; height: 1px; z-index: 1; background: linear-gradient(90deg, transparent, rgba(54, 197, 245, .35), transparent); }
.chan::after { content: ""; position: absolute; top: 0; left: 0; width: 40%; height: 2px; z-index: 1; background: linear-gradient(90deg, transparent, #36c5f5, transparent); filter: blur(.5px); animation: chan-vach 8s ease-in-out infinite; }
@keyframes chan-vach { 0% { transform: translateX(-100%); } 100% { transform: translateX(250%); } }
.chan__luoi-mo { position: absolute; inset: 0; z-index: -1; pointer-events: none; background-image: linear-gradient(rgba(255, 255, 255, .05) 1px, transparent 1px), linear-gradient(90deg, rgba(255, 255, 255, .05) 1px, transparent 1px); background-size: 48px 48px;
	-webkit-mask-image: radial-gradient(ellipse 75% 70% at 50% 15%, #000 15%, transparent 75%); mask-image: radial-gradient(ellipse 75% 70% at 50% 15%, #000 15%, transparent 75%); }
.chan__song-hat { position: absolute; left: 0; right: 0; bottom: 0; width: 100%; height: 320px; z-index: -1; pointer-events: none; -webkit-mask-image: linear-gradient(0deg, #000 35%, transparent 100%); mask-image: linear-gradient(0deg, #000 35%, transparent 100%); }
/* hạt sáng phía trên: chấm nhỏ lấp lánh, bay lên chậm */
.chan__sao { position: absolute; left: 0; right: 0; top: 0; height: 55%; z-index: -1; pointer-events: none; }
.chan__sao span { position: absolute; width: 3px; height: 3px; border-radius: 50%; background: #7fd3f7; box-shadow: 0 0 8px 1px rgba(54, 197, 245, .6); opacity: 0; animation: chan-sao 9s ease-in-out infinite; }
.chan__sao span:nth-child(1) { left: 6%; top: 60%; }
.chan__sao span:nth-child(2) { left: 14%; top: 30%; animation-delay: -2s; animation-duration: 11s; }
.chan__sao span:nth-child(3) { left: 23%; top: 75%; animation-delay: -5s; }
.chan__sao span:nth-child(4) { left: 31%; top: 20%; animation-delay: -7s; animation-duration: 12s; width: 2px; height: 2px; }
.chan__sao span:nth-child(5) { left: 42%; top: 55%; animation-delay: -1s; animation-duration: 10s; }
.chan__sao span:nth-child(6) { left: 51%; top: 15%; animation-delay: -4s; width: 2px; height: 2px; }
.chan__sao span:nth-child(7) { left: 60%; top: 68%; animation-delay: -6s; animation-duration: 13s; }
.chan__sao span:nth-child(8) { left: 69%; top: 35%; animation-delay: -3s; }
.chan__sao span:nth-child(9) { left: 77%; top: 80%; animation-delay: -8s; animation-duration: 11s; width: 2px; height: 2px; }
.chan__sao span:nth-child(10) { left: 85%; top: 25%; animation-delay: -2.5s; }
.chan__sao span:nth-child(11) { left: 92%; top: 58%; animation-delay: -5.5s; animation-duration: 12s; }
.chan__sao span:nth-child(12) { left: 97%; top: 12%; animation-delay: -9s; width: 2px; height: 2px; }
@keyframes chan-sao { 0% { opacity: 0; transform: translateY(14px) scale(.6); } 30% { opacity: .9; } 70% { opacity: .5; } 100% { opacity: 0; transform: translateY(-30px) scale(1); } }
.chan__cuoi { position: relative; }
@media (max-width: 760px) { .chan__song-hat { height: 220px; } .chan__sao span:nth-child(even) { display: none; } }
@media (prefers-reduced-motion: reduce) { .chan::after, .chan__sao span { animation: none; } .chan__sao { display: none; } }

/* ---------- lỗi dạng bong bóng cho form gọn 1 hàng (đăng ký nhận tin) ---------- */
.nhan-tin__form { position: relative; transition: border-color .2s, box-shadow .2s; }
.nhan-tin__form.is-loi { border-color: #ffb4a8; box-shadow: 0 0 0 3px rgba(255, 120, 100, .25); }
.o__loi--bong { position: absolute; left: 18px; top: calc(100% + 10px); z-index: 5; display: inline-flex; align-items: center; gap: 6px; padding: 7px 12px; border-radius: 10px; background: #fff; color: var(--do) !important; font-size: 13px; font-weight: 600; box-shadow: 0 10px 24px -10px rgba(6, 45, 82, .5); animation: loi-hien .25s ease both; white-space: nowrap; }
.o__loi--bong::before { content: ""; position: absolute; left: 18px; top: -6px; width: 12px; height: 12px; background: #fff; transform: rotate(45deg); border-radius: 2px; }
.o__loi--bong::after { content: "!"; order: -1; width: 18px; height: 18px; border-radius: 50%; background: var(--do); color: #fff; font-size: 12px; display: grid; place-items: center; }
@keyframes loi-hien { from { opacity: 0; transform: translateY(-4px); } }

/* header: kính mờ đặt ở lớp ::before - backdrop-filter trên chính .dau biến nó thành khung chứa cho menu điện thoại (position: fixed)
   làm menu chỉ cao bằng header và trang bị tràn ngang */
.dau, .dau.is-cuon { background: transparent !important; backdrop-filter: none !important; -webkit-backdrop-filter: none !important; }
.dau::before { content: ""; position: absolute; inset: 0; z-index: -1; background: rgba(255, 255, 255, .92); backdrop-filter: saturate(160%) blur(12px); -webkit-backdrop-filter: saturate(160%) blur(12px); transition: background .3s; }
.dau.is-cuon::before { background: rgba(255, 255, 255, .86); }
body.mo-menu .dau { z-index: 90; } /* menu nằm trong header: header phải cao hơn lớp nền tối .menu-nen (z 70) */
.dd-the[hidden], .the-kg[hidden], .faq__muc[hidden] { display: none !important; } /* các thẻ có display riêng: thuộc tính hidden (lọc thành phố, tìm FAQ) phải thắng */