/* =====================================================================
   PHONG CÁCH KÍNH MỜ (glassmorphism) — xanh tin cậy + cam cho nút mua
   Theo đề xuất của skill ui-ux-pro-max (13/11/2026).
   Bản gốc nền kem màu cam: luu-ban/ban-1-mau-cam-am/
   ===================================================================== */
:root {
  --nen: #eef2fb;
  --chu: #0f172a;
  --chu-phu: #475569;
  --kinh: rgba(255, 255, 255, 0.62);
  --kinh-dam: rgba(255, 255, 255, 0.82);
  --vien-kinh: rgba(255, 255, 255, 0.7);
  --vien: rgba(15, 23, 42, 0.08);
  --xanh: #2563eb;
  --xanh-dam: #1d4ed8;
  --xanh-nhat: rgba(37, 99, 235, 0.1);
  --cam: #c2410c;          /* chữ trắng trên nền này: 5,2:1 */
  --cam-dam: #9a3412;
  --luc: #047857;
  --luc-nhat: rgba(4, 120, 87, 0.12);
  --vang: #92400e;
  --vang-nhat: rgba(217, 119, 6, 0.14);
  --bong: 0 8px 32px rgba(30, 41, 99, 0.10), inset 0 1px 0 rgba(255, 255, 255, 0.8);
  --mo: 16px;
  --dom1: #60a5fa; --dom2: #a78bfa; --dom3: #fdba74;
}
@media (prefers-color-scheme: dark) {
  :root {
    --nen: #0b1020; --chu: #f1f5f9; --chu-phu: #cbd5e1;
    --kinh: rgba(22, 30, 54, 0.6); --kinh-dam: rgba(22, 30, 54, 0.85);
    --vien-kinh: rgba(255, 255, 255, 0.10); --vien: rgba(255, 255, 255, 0.10);
    --xanh: #3b82f6; --xanh-dam: #60a5fa; --xanh-nhat: rgba(96, 165, 250, 0.16);
    --luc: #6ee7b7; --luc-nhat: rgba(16, 185, 129, 0.18);
    --vang: #fcd34d; --vang-nhat: rgba(245, 158, 11, 0.18);
    --bong: 0 8px 32px rgba(0, 0, 0, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.06);
    --dom1: #1d4ed8; --dom2: #6d28d9; --dom3: #c2410c;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--nen); color: var(--chu);
  font: 16px/1.6 "Be Vietnam Pro", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased; position: relative; overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
h1, h2, h3 { line-height: 1.2; margin: 0; letter-spacing: -.02em; }
:focus-visible { outline: 3px solid var(--xanh); outline-offset: 3px; border-radius: 8px; }

/* Nền nhiều màu phía sau lớp kính */
.nen-mau { position: fixed; inset: 0; z-index: -1; overflow: hidden; pointer-events: none; }
.nen-mau span { position: absolute; border-radius: 50%; filter: blur(80px); opacity: .55; }
.nen-mau span:nth-child(1) { width: 52vw; height: 52vw; background: var(--dom1); top: -18vw; left: -12vw; }
.nen-mau span:nth-child(2) { width: 44vw; height: 44vw; background: var(--dom2); top: 20vh; right: -14vw; }
.nen-mau span:nth-child(3) { width: 38vw; height: 38vw; background: var(--dom3); bottom: -14vw; left: 22vw; opacity: .4; }

/* Lớp kính dùng chung */
.kinh {
  background: var(--kinh);
  -webkit-backdrop-filter: blur(var(--mo)) saturate(160%);
  backdrop-filter: blur(var(--mo)) saturate(160%);
  border: 1px solid var(--vien-kinh);
  box-shadow: var(--bong);
}

.khung { max-width: 1120px; margin: 0 auto; padding: 0 16px; }
.khung.hep { max-width: 760px; }
.hang { display: flex; align-items: center; gap: 16px; }

/* Nút */
.nut {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 44px;
  padding: 11px 22px; border-radius: 14px; font-weight: 600; text-decoration: none;
  border: 1px solid transparent; cursor: pointer; font-size: 15px; font-family: inherit;
  transition: background .2s, box-shadow .2s, transform .2s;
}
.nut-chinh { background: var(--cam); color: #fff; box-shadow: 0 6px 18px rgba(194, 65, 12, .3); }
.nut-chinh:hover { background: var(--cam-dam); }
.nut-vien { background: var(--kinh-dam); border-color: var(--vien); color: var(--chu); }
.nut-vien:hover { border-color: var(--xanh); color: var(--xanh-dam); }
.nut.nho { min-height: 40px; padding: 8px 16px; font-size: 14px; border-radius: 12px; }

/* Đầu trang */
.dau-trang { position: sticky; top: 12px; z-index: 10; margin: 12px 16px 0; }
.dau-trang .khung { max-width: 1120px; border-radius: 18px; padding: 0 12px 0 18px; }
.dau-trang .hang { height: 60px; justify-content: space-between; }
.thuong-hieu { font-weight: 800; text-decoration: none; display: flex; align-items: center; gap: 10px; font-size: 18px; }
.cham { width: 26px; height: 26px; border-radius: 8px; background: linear-gradient(135deg, var(--xanh), #7c3aed); position: relative; flex: none; }
.cham::after { content: ""; position: absolute; left: 10px; top: 7px; border: 6px solid transparent; border-left: 9px solid #fff; border-right: 0; }
.menu { display: flex; gap: 6px; }
.menu a { text-decoration: none; color: var(--chu-phu); font-weight: 500; font-size: 15px; padding: 8px 12px; border-radius: 10px; transition: background .2s, color .2s; }
.menu a:hover { color: var(--chu); background: var(--xanh-nhat); }
@media (max-width: 760px) { .menu { display: none; } }

/* Mở đầu */
.mo-dau { padding: 72px 0 56px; }
.mo-dau .khung { display: grid; grid-template-columns: 1.25fr 1fr; gap: 40px; align-items: center; }
@media (max-width: 900px) { .mo-dau .khung { grid-template-columns: 1fr; } }
.nhan-tren {
  display: inline-block; color: var(--xanh-dam); font-weight: 600; font-size: 13px; letter-spacing: .04em;
  text-transform: uppercase; margin: 0 0 18px; padding: 6px 12px; border-radius: 999px; background: var(--xanh-nhat);
}
.mo-dau h1 { font-size: clamp(32px, 5vw, 54px); font-weight: 800; }
.mo-dau h1 em {
  font-style: normal; background: linear-gradient(90deg, var(--xanh), #7c3aed);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
@media (prefers-color-scheme: dark) { .mo-dau h1 em { background: linear-gradient(90deg, #93c5fd, #c4b5fd); -webkit-background-clip: text; background-clip: text; } }
.mo-ta { font-size: 18px; color: var(--chu-phu); max-width: 600px; margin: 20px 0 28px; }
.nut-nhom { flex-wrap: wrap; gap: 12px; }

.bang-app { border-radius: 24px; padding: 22px; }
.bang-app .tieu { font-size: 13px; font-weight: 600; color: var(--chu-phu); text-transform: uppercase; letter-spacing: .05em; margin-bottom: 14px; }
.bang-app ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.bang-app li { display: flex; align-items: center; gap: 12px; padding: 10px; border-radius: 14px; background: var(--kinh-dam); border: 1px solid var(--vien); }
.bang-app li img { width: 40px; height: 40px; border-radius: 10px; flex: none; }
.bang-app li b { display: block; font-size: 15px; }
.bang-app li span { font-size: 13px; color: var(--chu-phu); }
.bang-app li .nen-tang { margin-left: auto; gap: 5px; flex-wrap: nowrap; }
.bang-app li .nt svg { height: 18px; }

.so-lieu { list-style: none; padding: 0; margin: 40px 0 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; max-width: 640px; }
.so-lieu li { border-radius: 16px; padding: 14px 16px; }
.so-lieu b { display: block; font-size: 28px; font-weight: 800; color: var(--xanh-dam); }
.so-lieu span { color: var(--chu-phu); font-size: 13px; line-height: 1.4; display: block; }
@media (prefers-color-scheme: dark) { .so-lieu b { color: #93c5fd; } }
@media (max-width: 600px) { .so-lieu { grid-template-columns: 1fr 1fr; } }

/* Mục */
.muc { padding: 64px 0; }
.tieu-de-muc { display: flex; justify-content: space-between; align-items: end; gap: 16px; flex-wrap: wrap; margin-bottom: 28px; }
.tieu-de-muc h2 { font-size: clamp(26px, 3.4vw, 36px); font-weight: 800; }
.phu { color: var(--chu-phu); margin: -12px 0 24px; }

.loc { display: flex; gap: 4px; flex-wrap: wrap; padding: 5px; border-radius: 16px; }
.loc button {
  border: 0; background: none; padding: 8px 14px; min-height: 38px; border-radius: 11px; cursor: pointer;
  font: 500 14px "Be Vietnam Pro", sans-serif; color: var(--chu-phu); transition: background .2s, color .2s;
}
.loc button:hover { color: var(--chu); }
.loc button.chon { background: var(--xanh); color: #fff; }

/* Lưới sản phẩm */
.luoi { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 20px; }
@media (max-width: 400px) { .luoi { grid-template-columns: 1fr; } }
.the-sp {
  border-radius: 22px; padding: 22px; display: flex; flex-direction: column; gap: 14px;
  transition: transform .25s, box-shadow .25s;
}
.the-sp:hover { transform: translateY(-4px); box-shadow: 0 16px 40px rgba(30, 41, 99, .16), inset 0 1px 0 rgba(255,255,255,.8); }
.the-sp .dau { display: flex; gap: 14px; align-items: center; }
.bieu-tuong {
  width: 56px; height: 56px; border-radius: 15px; flex: none; object-fit: cover;
  display: grid; place-items: center; color: #fff;
  background: linear-gradient(135deg, var(--xanh), #7c3aed);
  box-shadow: 0 6px 16px rgba(37, 99, 235, .25);
}
img.bieu-tuong { background: none; box-shadow: 0 6px 16px rgba(15, 23, 42, .15); }
.bieu-tuong svg { width: 28px; height: 28px; }
.the-sp h3 { font-size: 18px; font-weight: 700; }
.nhan-nho { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 5px; }
.nhan { font-size: 12px; font-weight: 600; padding: 3px 9px; border-radius: 999px; background: var(--xanh-nhat); color: var(--xanh-dam); }
@media (prefers-color-scheme: dark) { .nhan { color: #bfdbfe; } }
.nhan.ban { background: var(--luc-nhat); color: var(--luc); }
.nhan.sap { background: var(--vang-nhat); color: var(--vang); }
.the-sp p { margin: 0; color: var(--chu-phu); font-size: 15px; flex: 1; }
.the-sp .cuoi { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding-top: 14px; border-top: 1px solid var(--vien); }
.gia { font-weight: 700; }
.gia.lien-he { color: var(--chu-phu); font-weight: 500; font-size: 14px; }

/* Nền tảng đăng video */
.nen-tang { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.nt-nhan { font-size: 13px; color: var(--chu-phu); margin-right: 2px; }
.nt { display: inline-flex; align-items: center; gap: 6px; }
.nt svg { height: 22px; width: auto; display: block; }
.the-hop .nen-tang { gap: 10px; }
.the-hop .nt { background: var(--kinh-dam); border: 1px solid var(--vien); padding: 6px 12px 6px 8px; border-radius: 999px; font-size: 14px; font-weight: 600; }

/* Ảnh mẫu */
.mau-luoi { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; }
.mau-luoi figure { margin: 0; border-radius: 22px; overflow: hidden; padding: 10px; }
.mau-luoi img { aspect-ratio: 16/9; object-fit: cover; width: 100%; border-radius: 14px; }
.mau-luoi figcaption { padding: 12px 8px 4px; font-size: 14px; color: var(--chu-phu); font-weight: 500; }

/* Các bước */
.buoc { list-style: none; counter-reset: b; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; }
.buoc li { counter-increment: b; border-radius: 20px; padding: 22px; }
.buoc li::before {
  content: counter(b); display: grid; place-items: center; width: 38px; height: 38px; border-radius: 12px;
  background: linear-gradient(135deg, var(--xanh), #7c3aed); color: #fff; font-weight: 800; margin-bottom: 14px;
}
.buoc b { display: block; margin-bottom: 6px; }
.buoc span { color: var(--chu-phu); font-size: 15px; }

/* Hỏi đáp */
details { border-radius: 16px; padding: 0 20px; margin-bottom: 10px; }
summary { cursor: pointer; padding: 16px 0; font-weight: 600; list-style: none; display: flex; justify-content: space-between; gap: 12px; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; color: var(--xanh); font-size: 22px; line-height: 1; }
details[open] summary::after { content: "−"; }
details p { margin: 0 0 18px; color: var(--chu-phu); }

/* Chân trang */
.chan-trang { padding: 24px 16px 32px; }
.chan-trang .khung { border-radius: 22px; padding: 24px; }
.chan-trang .hang { justify-content: space-between; flex-wrap: wrap; }
.chan-trang .phu { margin: 6px 0 0; font-size: 14px; }

/* Hộp chi tiết */
.hop-thoai { position: fixed; inset: 0; z-index: 50; display: grid; place-items: center; padding: 16px; }
.hop-thoai[hidden] { display: none; }
.nen-mo { position: absolute; inset: 0; background: rgba(15, 23, 42, .45); -webkit-backdrop-filter: blur(6px); backdrop-filter: blur(6px); }
.the-hop {
  position: relative; background: var(--kinh-dam); -webkit-backdrop-filter: blur(24px); backdrop-filter: blur(24px);
  border: 1px solid var(--vien-kinh); border-radius: 24px; max-width: 620px; width: 100%;
  max-height: calc(100vh - 32px); overflow: auto; padding: 28px; box-shadow: 0 24px 64px rgba(15, 23, 42, .3);
}
.dong { position: absolute; top: 14px; right: 14px; width: 44px; height: 44px; border-radius: 12px; border: 1px solid var(--vien); background: var(--kinh); color: var(--chu); font-size: 22px; cursor: pointer; }
.the-hop .dau { display: flex; gap: 16px; align-items: center; margin-bottom: 16px; padding-right: 48px; }
.the-hop .bieu-tuong { width: 64px; height: 64px; }
.the-hop h3 { font-size: 22px; }
.the-hop h4 { margin: 22px 0 8px; font-size: 13px; text-transform: uppercase; letter-spacing: .05em; color: var(--chu-phu); }
.the-hop ul { margin: 0; padding-left: 20px; }
.the-hop li { margin-bottom: 6px; }
.the-hop .anh-mau { border-radius: 14px; margin-top: 18px; }
.the-hop .cuoi { margin-top: 24px; display: flex; gap: 10px; flex-wrap: wrap; align-items: center; justify-content: space-between; }
.loi-nhan { margin-top: 14px; font-size: 14px; color: var(--chu-phu); background: var(--xanh-nhat); padding: 12px 14px; border-radius: 12px; }
.loi-nhan code { font-family: inherit; color: var(--chu); }

/* Máy khách bật "giảm chuyển động" thì tắt hiệu ứng động */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
  .the-sp:hover { transform: none; }
}

/* Đầu trang chỉ còn chữ, sản phẩm hiện ngay bên dưới (anh chốt 13/11/2026) */
.mo-dau { padding: 48px 0 8px; }
.mo-dau .khung { display: block; }
.mo-dau h1 { font-size: clamp(28px, 4vw, 42px); max-width: 820px; }
.mo-ta { font-size: 17px; max-width: 720px; margin: 14px 0 0; }
.muc-sp { padding-top: 32px; }
.thuong-hieu, .menu a, .dau-trang .nut { white-space: nowrap; }
@media (max-width: 900px) { .menu { display: none; } }

/* 4 nhóm sản phẩm (anh chốt 13/11/2026) */
.loc a {
  text-decoration: none; padding: 8px 14px; min-height: 38px; display: inline-flex; align-items: center;
  border-radius: 11px; font-size: 14px; font-weight: 500; color: var(--chu-phu); transition: background .2s, color .2s;
}
.loc a:hover { background: var(--xanh); color: #fff; }
.nhom { scroll-margin-top: 96px; }
.nhom + .nhom { margin-top: 56px; }
.dau-nhom { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 18px; padding-bottom: 12px; border-bottom: 2px solid var(--vien); }
.dau-nhom h3 { font-size: clamp(20px, 2.6vw, 26px); font-weight: 800; text-transform: uppercase; letter-spacing: .01em; }
.dau-nhom .nen-tang { gap: 6px; }
.dau-nhom .dem { margin-left: auto; font-size: 14px; color: var(--chu-phu); font-weight: 500; }
.mo-ta-nhom { color: var(--chu-phu); margin: -6px 0 18px; }
.gia.mien-phi { color: var(--luc); font-weight: 700; }
.tac-gia-sp { font-size: 13px; color: var(--chu-phu); }
.the-hop .tac-gia-sp { font-size: 14px; margin: 0; }
.the-hop .tac-gia-sp a { color: var(--xanh-dam); }