/* Trang bán VietUp Studio. Đồng bộ hoc.vietup.com.au (tep/hoc.css, 28/10): cùng token màu, font, nút, đầu trang, quầng sáng.
   Boss 28/10: mặc định NỀN TRẮNG, nút đổi sang nền tối (lưu lựa chọn ở trình duyệt, khoá "giao-dien" như hoc).
   Dial VARIANCE 7 / MOTION 5 / DENSITY 4. Màu chính = teal VietUp #168388, không cam. Bo góc 10 / 12 / 16.
   Thang chữ 14 / 16 / 19 / 28 / 44 / 64. Đổi màu cả trang: chỉ sửa 2 khối token dưới. */
:root {
  --nen: #FFFFFF;
  --nen-2: #F5F9F9;
  --mat: #E9F2F2;
  --vien: rgba(15, 45, 47, .11);
  --chu: #122326;
  --chu-phu: #546A6D;
  --chu-dam: #08181A;
  --chinh: #168388;
  --chinh-sang: #127579;
  --chinh-dam: #0F6A6F;
  --chinh-chu: #0F6A6F;
  --diem: #2BB8B3;
  --diem-sang: #0F6A6F;
  --hero-mo: .45;
  --bong: rgba(15, 45, 47, .10);
  --cho: #F5F9F9;          /* ô chờ tư liệu */
  --cho-soc: #E9F2F2;
  --cho-vien: #8FB3B0;
  --bo: 16px;
  --rong: 1120px;
  color-scheme: light;
}
:root[data-theme="toi"] {
  --nen: #0C1314;
  --nen-2: #121D1F;
  --mat: #1A292B;
  --vien: color-mix(in srgb, var(--chu) 9%, transparent);
  --chu: #E8F2F1;
  --chu-phu: #A0B6B4;
  --chu-dam: #FFFFFF;
  --chinh: #168388;
  --chinh-sang: #2BB8B3;
  --chinh-dam: #0F6A6F;
  --chinh-chu: #9FE3DE;
  --diem: #2BB8B3;
  --diem-sang: #5ED6CF;
  --hero-mo: 1;
  --bong: rgba(0, 0, 0, .5);
  --cho: #121D1F;
  --cho-soc: #162527;
  --cho-vien: #3E6460;
  color-scheme: dark;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--nen); color: var(--chu); font: 16px/1.65 "Be Vietnam Pro", system-ui, -apple-system, "Segoe UI", sans-serif;
  overflow-x: hidden; touch-action: manipulation; transition: background-color .2s ease, color .2s ease; }
img, video { max-width: 100%; display: block; }
a { color: var(--diem-sang); }
h1, h2, h3 { margin: 0; line-height: 1.15; letter-spacing: -.02em; text-wrap: balance; color: var(--chu-dam); }
h2 { font-size: clamp(28px, 4vw, 44px); font-weight: 800; }
h3 { font-size: 19px; font-weight: 700; }
p { margin: 0; }
:focus-visible { outline: 2px solid var(--chinh-sang); outline-offset: 2px; }
.khung { max-width: var(--rong); margin: 0 auto; padding: 0 16px; }
.muc { padding: 88px 0; }
.muc + .muc { border-top: 1px solid var(--vien); }
.muc.nhat { background: var(--nen-2); }
.dan { color: var(--chu-phu); max-width: 62ch; }
.bo-qua { position: absolute; left: 12px; top: -60px; z-index: 20; padding: 8px 14px; border-radius: 10px; background: var(--chinh); color: #fff; font-weight: 700; }
.bo-qua:focus { top: 10px; }

/* ---------- đầu trang (giống hoc: logo trái, menu, nút sáng tối, nút chính phải) ---------- */
.dau { position: sticky; top: 0; z-index: 10; display: flex; align-items: center; gap: 12px; min-height: 64px;
  padding: 8px max(16px, calc((100% - var(--rong)) / 2)); background: color-mix(in srgb, var(--nen) 86%, transparent);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); border-bottom: 1px solid var(--vien); }
.logo { display: flex; align-items: center; gap: 10px; color: var(--chu); text-decoration: none; min-width: 0; }
.logo img { width: 34px; height: 34px; border-radius: 9px; flex: none; }
.logo span { display: flex; flex-direction: column; line-height: 1.2; min-width: 0; }
.logo b { font-size: 15px; }
.logo i { font-style: normal; font-size: 12px; color: var(--chu-phu); white-space: nowrap; }
.dau nav { display: flex; gap: 4px; margin-right: auto; margin-left: 8px; }
.dau nav a { color: var(--chu-phu); text-decoration: none; font-size: 14px; font-weight: 600; padding: 8px 12px; border-radius: 10px; white-space: nowrap; }
.dau nav a:hover { color: var(--chu); background: var(--mat); }
.nut-sang-toi { flex: none; display: inline-grid; place-items: center; width: 40px; height: 40px; border-radius: 10px; cursor: pointer;
  background: transparent; color: var(--chu); border: 1px solid var(--vien); font-size: 20px; }
.nut-sang-toi:hover { background: var(--mat); }
.nut-sang-toi .icon-sang, :root[data-theme="toi"] .nut-sang-toi .icon-toi { display: none; }
:root[data-theme="toi"] .nut-sang-toi .icon-sang { display: inline; }

/* ---------- nút (giống hoc) ---------- */
.nut { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 50px; padding: 0 24px;
  border-radius: 12px; font: inherit; font-weight: 700; text-decoration: none; cursor: pointer; border: 0; white-space: nowrap;
  transition: transform .15s, box-shadow .15s, background-color .15s; }
.nut:active { transform: translateY(1px); }
.nut-chinh { background: var(--chinh); color: #fff; box-shadow: 0 10px 30px -10px color-mix(in srgb, var(--chinh) 75%, transparent); }
.nut-chinh:hover { background: var(--chinh-dam); box-shadow: 0 12px 34px -8px color-mix(in srgb, var(--chinh) 85%, transparent); }
.nut-vien { background: color-mix(in srgb, var(--chu) 3%, transparent); color: var(--chu); border: 1px solid color-mix(in srgb, var(--chu) 22%, transparent); }
.nut-vien:hover { background: var(--mat); }
.nut-nho { min-height: 40px; padding: 0 16px; font-size: 14px; border-radius: 10px; }
.ghi-gia { font-size: 14px; color: var(--chu-phu); margin-top: 14px; }

/* ---------- hero: quầng sáng teal như hoc ---------- */
.hero { position: relative; overflow: hidden; border-bottom: 1px solid var(--vien); }
.hero-sang { position: absolute; inset: -20% -10% auto; height: 140%; pointer-events: none; opacity: var(--hero-mo);
  background:
    radial-gradient(38% 42% at 15% 30%, color-mix(in srgb, var(--diem) 42%, transparent), transparent 70%),
    radial-gradient(32% 38% at 88% 22%, color-mix(in srgb, var(--chinh) 30%, transparent), transparent 70%),
    radial-gradient(30% 30% at 60% 95%, color-mix(in srgb, var(--diem-sang) 16%, transparent), transparent 70%); }
.hero-noi { position: relative; display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); gap: 56px; align-items: center;
  max-width: var(--rong); margin: 0 auto; padding: 72px 16px 80px; }
.kicker { display: inline-flex; align-items: center; gap: 8px; margin: 0 0 22px; padding: 4px 14px 4px 4px; border-radius: 99px;
  background: color-mix(in srgb, var(--chinh) 10%, transparent); border: 1px solid color-mix(in srgb, var(--chinh-sang) 35%, transparent);
  font-size: 13px; font-weight: 600; color: var(--chinh-chu); }
.kicker img { width: 24px; height: 24px; border-radius: 50%; }
.hero h1 { font-size: clamp(36px, 5.4vw, 64px); font-weight: 800; line-height: 1.08; letter-spacing: -.025em; margin-bottom: 20px; }
.hero h1 .nhan-chu { color: var(--chinh-sang); }
/* hiệu ứng gõ chữ như hoc.vietup.com.au: cụm teal tự gõ / xoá lần lượt vài ý, con trỏ nhấp nháy.
   Chữ đầu có sẵn trong HTML (không JS vẫn đọc được); giữ đủ chỗ 2 dòng để trang không nhảy khi chữ đổi dài ngắn */
.hero h1 { min-height: 2.2em; }
.hero h1 .go { border-right: 3px solid var(--chinh-sang); padding-right: 4px; animation: nhay-tro 1s steps(1) infinite; }
@keyframes nhay-tro { 50% { border-right-color: transparent; } }
.hero-phu { font-size: clamp(16px, 2.1vw, 19px); color: var(--chu-phu); max-width: 46ch; margin: 0 0 30px; }
.hero-nut { display: flex; flex-wrap: wrap; gap: 12px; }
.truoc-sau { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.truoc-sau figure { margin: 0; }
.truoc-sau figcaption { font-size: 14px; color: var(--chu-phu); margin-top: 8px; }

/* ô chờ tư liệu thật: boss gửi rồi thay (KHÔNG để lên mạng khi còn ô này) */
.can-them { display: grid; place-items: center; text-align: center; padding: 18px; border: 2px dashed var(--cho-vien); border-radius: var(--bo);
  background: repeating-linear-gradient(135deg, var(--cho) 0 14px, var(--cho-soc) 14px 28px); color: var(--chu-phu); font-size: 14px; line-height: 1.5; }
.can-them b { display: block; color: var(--chu); font-size: 15px; margin-bottom: 4px; }
.doc { aspect-ratio: 9 / 16; }
.ngang { aspect-ratio: 16 / 10; }

/* ---------- đầu một khối, đặt giữa (nhãn nhỏ + tiêu đề + 1 dòng giải thích), boss 28/10 ---------- */
.dau-khoi { text-align: center; max-width: 760px; margin: 0 auto; }
.dau-khoi .kicker { margin-bottom: 18px; padding: 5px 14px; }
.dau-khoi .dan { margin: 14px auto 0; }

/* ---------- nỗi đau: 1 khối lớn + 2 khối nhỏ ---------- */
.dau-dau { display: grid; grid-template-columns: 1.3fr 1fr; gap: 16px; margin-top: 40px; }
.dau-dau article { background: var(--nen); border: 1px solid var(--vien); border-radius: var(--bo); padding: 28px; box-shadow: 0 1px 3px var(--bong); }
.dau-dau article:first-child { grid-row: span 2; display: flex; flex-direction: column; justify-content: flex-end; min-height: 300px;
  background: linear-gradient(160deg, color-mix(in srgb, var(--diem) 14%, var(--nen)) 0%, var(--nen) 70%); }
.dau-dau p { color: var(--chu-phu); margin-top: 10px; }
/* 4 nỗi đau: khối lớn bên trái cao bằng 3 khối nhỏ bên phải */
.dau-dau.bon article:first-child { grid-row: span 3; }
.nhan-icon { color: var(--chinh-sang); margin-right: 8px; vertical-align: -2px; }

/* ---------- tool làm gì: zig-zag 2 cột ---------- */
.zz { display: grid; gap: 72px; margin-top: 48px; }
.zz-hang { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.zz-hang:nth-child(even) .zz-anh { order: 2; }
.zz-hang p { color: var(--chu-phu); margin-top: 12px; }
.zz-hang ul { margin: 16px 0 0; padding-left: 20px; color: var(--chu-phu); }
.zz-hang li + li { margin-top: 6px; }
.them-tn { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 40px; margin-top: 40px; }
.them-tn div { padding: 18px 0; border-bottom: 1px solid var(--vien); }
.them-tn b { display: block; color: var(--chu-dam); }
.them-tn span { color: var(--chu-phu); font-size: 15px; }

/* ---------- mô phỏng ---------- */
.mo-phong { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 48px; align-items: start; }
.buoc { list-style: none; margin: 0; padding: 0; background: var(--nen); border: 1px solid var(--vien); border-radius: var(--bo); overflow: hidden; box-shadow: 0 1px 3px var(--bong); }
.buoc li { display: flex; align-items: center; gap: 14px; padding: 15px 22px; border-bottom: 1px solid var(--vien); color: var(--chu-phu); transition: color .25s ease, background-color .25s ease; }
.buoc li:last-child { border-bottom: 0; }
.buoc li i { font-size: 20px; width: 22px; text-align: center; }
.buoc li.xong { color: var(--chu); }
.buoc li.xong i, .buoc li.dang i { color: var(--chinh-sang); }
.buoc li.dang { background: var(--mat); color: var(--chu-dam); }
.chay { margin-top: 18px; }

/* ---------- gói ---------- */
.goi { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 420px); gap: 48px; align-items: center; }
.the-gia { background: var(--nen); border: 1px solid color-mix(in srgb, var(--chinh-sang) 45%, transparent); border-radius: 20px; padding: 32px;
  box-shadow: 0 20px 50px -24px color-mix(in srgb, var(--chinh) 55%, transparent); }
.gia { font-size: 64px; font-weight: 800; letter-spacing: -.03em; font-variant-numeric: tabular-nums; line-height: 1; color: var(--chu-dam); }
.gia small { font-size: 19px; font-weight: 600; color: var(--chu-phu); letter-spacing: 0; }
.the-gia ul { list-style: none; margin: 24px 0 28px; padding: 0; }
.the-gia li { display: flex; gap: 10px; padding: 7px 0; }
.the-gia li i { color: var(--chinh-sang); margin-top: 5px; }
.the-gia .nut { width: 100%; }

/* ---------- cần gì ---------- */
.can-gi { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin-top: 36px; }
.can-gi div { background: var(--nen); border: 1px solid var(--vien); border-radius: var(--bo); padding: 24px; box-shadow: 0 1px 3px var(--bong); }
.can-gi p { color: var(--chu-phu); margin-top: 8px; }

/* ---------- hỏi đáp ---------- */
.hd { display: grid; grid-template-columns: 300px 1fr; gap: 56px; }
.hd details { border-bottom: 1px solid var(--vien); }
.hd summary { list-style: none; cursor: pointer; display: flex; justify-content: space-between; gap: 16px; padding: 20px 0; font-weight: 700; font-size: 18px; color: var(--chu-dam); }
.hd summary::-webkit-details-marker { display: none; }
.hd summary i { transition: transform .2s ease; color: var(--chinh-sang); }
.hd details[open] summary i { transform: rotate(45deg); }
.hd details p { color: var(--chu-phu); padding: 0 0 20px; max-width: 64ch; }

/* ---------- chốt + chân trang ---------- */
.chot { position: relative; overflow: hidden; text-align: center; }
.chot .hero-sang { opacity: calc(var(--hero-mo) * .7); }
.chot .khung { position: relative; }
.chot p.dan { margin: 16px auto 28px; }
.chan { padding: 32px 0 48px; color: var(--chu-phu); font-size: 14px; border-top: 1px solid var(--vien); }
.chan .khung { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; }
.chan a { color: var(--chu-phu); }

/* ---------- 1. cửa sổ app nghiêng + nhãn nổi (hero) ---------- */
.cua-so-app { position: relative; perspective: 1400px; padding: 28px 8px; }
.cua-so { border-radius: var(--bo); overflow: hidden; background: var(--nen); border: 1px solid var(--vien);
  box-shadow: 0 40px 80px -30px color-mix(in srgb, var(--chinh) 45%, transparent), 0 12px 30px -12px var(--bong);
  transform: rotateY(-9deg) rotateX(5deg) rotateZ(-1deg); transform-origin: 60% 50%; transition: transform .6s ease; }
.cua-so-app:hover .cua-so { transform: rotateY(-4deg) rotateX(2deg); }
.cua-so-thanh { display: flex; align-items: center; gap: 6px; height: 34px; padding: 0 12px; background: var(--nen-2); border-bottom: 1px solid var(--vien); }
.cua-so-thanh span { width: 10px; height: 10px; border-radius: 50%; background: #F87171; }
.cua-so-thanh span:nth-child(2) { background: #FBBF24; } .cua-so-thanh span:nth-child(3) { background: #34D399; }
.cua-so-thanh b { margin-left: 8px; font-size: 12px; color: var(--chu-phu); font-weight: 600; }
.cua-so-anh { aspect-ratio: 16 / 10; border: 0; border-radius: 0; }
.nhan-noi { position: absolute; display: inline-flex; align-items: center; gap: 8px; margin: 0; padding: 10px 14px; border-radius: 12px;
  background: var(--nen); border: 1px solid var(--vien); box-shadow: 0 14px 34px -14px var(--bong), 0 2px 6px var(--bong);
  font-size: 14px; font-weight: 700; color: var(--chu-dam); white-space: nowrap; animation: troi 6s ease-in-out infinite; }
.nhan-noi i { color: var(--chinh-sang); font-size: 18px; }
.nhan-1 { top: 4px; left: -14px; }
.nhan-2 { bottom: 6px; right: -6px; animation-delay: -3s; }
@keyframes troi { 50% { transform: translateY(-8px); } }

/* nút chính ở hero: quầng sáng "thở" nhẹ (chỉ đổi độ mờ) */
.hero .nut-chinh { position: relative; }
.hero .nut-chinh::before { content: ""; position: absolute; inset: -6px; border-radius: 16px; background: var(--chinh); filter: blur(16px);
  opacity: .25; z-index: -1; animation: tho 3.2s ease-in-out infinite; }
@keyframes tho { 50% { opacity: .6; } }

/* ---------- 2. dải viên chạy ngang (boss 28/10: chữ trơn to và đơn điệu -> viên nhỏ có icon như dải công cụ của hoc) ---------- */
.dai-chu { padding: 18px 0 20px; border-bottom: 1px solid var(--vien); }
.dai-chu > p { text-align: center; font-size: 12px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--chu-phu); margin: 0 0 14px; }
.dai-chu-khung { display: flex; overflow: hidden;
  mask-image: linear-gradient(90deg, transparent, #000 10%, #000 90%, transparent); -webkit-mask-image: linear-gradient(90deg, transparent, #000 10%, #000 90%, transparent); }
.dai-chu-chay { flex: none; display: flex; gap: 12px; margin: 0; padding: 4px 6px; list-style: none; animation: chay 52s linear infinite; }
.dai-chu-khung:hover .dai-chu-chay { animation-play-state: paused; }
.dai-chu-chay li { display: inline-flex; align-items: center; gap: 10px; padding: 10px 18px; border-radius: 12px; white-space: nowrap;
  background: var(--nen); border: 1px solid var(--vien); box-shadow: 0 1px 2px var(--bong); font-weight: 600; font-size: 15px; color: var(--chu); }
.dai-chu-chay li i { font-size: 18px; color: var(--chinh-sang); }
@keyframes chay { to { transform: translateX(-50%); } }

/* trước / sau */
.ts { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); gap: 48px; align-items: center; }

/* ---------- 3. demo tìm cảnh bằng chữ ---------- */
.tim { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); gap: 48px; align-items: center; }
.tim-hop { background: var(--nen); border: 1px solid var(--vien); border-radius: 20px; padding: 20px; box-shadow: 0 24px 60px -30px color-mix(in srgb, var(--chinh) 50%, transparent); }
.tim-o { display: flex; align-items: center; gap: 10px; min-height: 52px; padding: 0 16px; border-radius: 12px; background: var(--nen-2);
  border: 1px solid color-mix(in srgb, var(--chinh-sang) 40%, transparent); font-weight: 600; color: var(--chu-dam); }
.tim-o i { color: var(--chinh-sang); font-size: 20px; }
.tim-tro { width: 2px; height: 20px; background: var(--chinh-sang); animation: nhay 1s steps(1) infinite; }
@keyframes nhay { 50% { opacity: 0; } }
.tim-kq { list-style: none; margin: 14px 0 0; padding: 0; display: grid; gap: 8px; }
.tim-kq li { display: grid; grid-template-columns: 72px minmax(0, 1fr) 80px; gap: 14px; align-items: center; padding: 8px; border-radius: 12px;
  background: var(--nen-2); transition: opacity .35s ease, transform .35s ease; }
.js .tim-kq li { opacity: 0; transform: translateY(8px); }
.js .tim-kq li.hien-kq { opacity: 1; transform: none; }
.tim-anh { aspect-ratio: 16 / 10; border-radius: 8px; }
.a1 { background: linear-gradient(135deg, #F9A8D4, #FBCFE8 60%, #F5D0C5); }
.a2 { background: linear-gradient(135deg, #FDE7D8, #E9C2A6 60%, #D6A88A); }
.a3 { background: linear-gradient(135deg, #C7F0EC, #F8D7E3 60%, #F3B4C8); }
.a4 { background: linear-gradient(135deg, #D7E3E2, #B9CFCC 60%, #9DB8B5); }
.tim-ten { min-width: 0; }
.tim-ten b { display: block; font-size: 14px; color: var(--chu-dam); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.tim-ten i { display: block; font-style: normal; font-size: 13px; color: var(--chu-phu); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.tim-khop { position: relative; height: 6px; border-radius: 99px; background: var(--mat); overflow: hidden; }
.tim-khop::after { content: ""; position: absolute; inset: 0; background: var(--chinh-sang); border-radius: inherit; transform-origin: left; transform: scaleX(var(--muc)); }
.tim-ghi { margin-top: 12px; font-size: 13px; color: var(--chu-phu); }
.an-chu { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

/* ---------- 4. giao diện: tab trái, màn phải ---------- */
.gd { display: grid; grid-template-columns: minmax(0, 360px) minmax(0, 1fr); gap: 32px; align-items: start; margin-top: 40px; }
.gd-tab { display: grid; gap: 8px; }
.gd-tab button { display: flex; gap: 14px; align-items: flex-start; text-align: left; padding: 14px 16px; border-radius: 14px; cursor: pointer;
  background: transparent; border: 1px solid transparent; color: var(--chu-phu); font: inherit; font-size: 14px; line-height: 1.5;
  transition: background-color .2s ease, border-color .2s ease; }
.gd-tab button i { font-size: 22px; color: var(--chu-phu); margin-top: 2px; }
.gd-tab button b { display: block; font-size: 16px; color: var(--chu-dam); }
.gd-tab button:hover { background: var(--nen); }
.gd-tab button[aria-selected="true"] { background: var(--nen); border-color: color-mix(in srgb, var(--chinh-sang) 45%, transparent); box-shadow: 0 8px 24px -14px var(--bong); }
.gd-tab button[aria-selected="true"] i { color: var(--chinh-sang); }
.gd-man { border-radius: var(--bo); overflow: hidden; border: 1px solid var(--vien); background: var(--nen); box-shadow: 0 30px 70px -34px color-mix(in srgb, var(--chinh) 50%, transparent); }
.gd-anh { aspect-ratio: 16 / 10; border: 0; border-radius: 0; animation: hien-man .35s ease; }
@keyframes hien-man { from { opacity: 0; } }

/* ---------- 5. nói trước cho rõ ---------- */
.noi-ro { list-style: none; margin: 32px 0 0; padding: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.noi-ro li { display: flex; gap: 14px; padding: 20px; border-radius: var(--bo); border: 1px solid var(--vien); background: var(--nen-2); }
.noi-ro i { font-size: 22px; color: var(--chu-phu); flex: none; margin-top: 2px; }
.noi-ro b { display: block; color: var(--chu-dam); }
.noi-ro span { color: var(--chu-phu); }

/* ---------- 6. hiện dần khi cuộn tới (chỉ khi có JS; tắt chuyển động thì hiện ngay) ---------- */
.js [data-hien] { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.js [data-hien].vao { opacity: 1; transform: none; }

@media (max-width: 900px) {
  .ts, .tim, .gd { grid-template-columns: 1fr; gap: 28px; }
  .noi-ro { grid-template-columns: 1fr; }
  .cua-so-app { padding: 24px 0; }
  .nhan-1 { left: 0; } .nhan-2 { right: 0; }
  .gd-tab { grid-auto-flow: column; grid-auto-columns: minmax(220px, 1fr); overflow-x: auto; scrollbar-width: none; padding-bottom: 4px; }
}
@media (max-width: 900px) {
  .muc { padding: 64px 0; }
  .hero-noi { grid-template-columns: 1fr; gap: 32px; padding: 40px 16px 56px; }
  .zz-hang, .mo-phong, .goi, .hd { grid-template-columns: 1fr; gap: 32px; }
  .zz-hang:nth-child(even) .zz-anh { order: 0; }
  .dau-dau { grid-template-columns: 1fr; }
  .dau-dau article:first-child { min-height: 0; grid-row: auto; }
  .them-tn, .can-gi { grid-template-columns: 1fr; }
  .dau nav { display: none; }
  .dau .logo { margin-right: auto; }
  .truoc-sau { max-width: 480px; }
}
@media (max-width: 480px) {
  .logo i { display: none; }
  .hero-nut .nut { flex: 1 1 100%; }
  .gia { font-size: 52px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  body, .nut, .buoc li, .hd summary i, .cua-so, .tim-kq li { transition: none; }
  .nhan-noi, .hero .nut-chinh::before, .tim-tro, .gd-anh, .hero h1 .go { animation: none; }
  .hero h1 .go { border-right: 0; }
  .dai-chu-khung { mask-image: none; -webkit-mask-image: none; }
  .dai-chu-chay { animation: none; flex: 1; flex-wrap: wrap; justify-content: center; }
  .dai-chu-chay > :nth-child(n+12) { display: none; }   /* bản lặp chỉ để chạy vòng: tắt chuyển động thì giấu */
  .cua-so { transform: none; }
  .js [data-hien] { opacity: 1; transform: none; transition: none; }
}