/* Giao diện trang Phúc Hương Stone — màu lấy theo logo (xanh đậm + xanh dương), nền trắng/xám đá.
   Muốn đổi màu chính: sửa 2 dòng --xanh-dam và --xanh ngay dưới đây. */
:root {
  --xanh-dam: #0d1b6b;
  --xanh: #1562c4;
  --xanh-nhat: #e8eefb;
  --da: #f3f2ef;
  --chu: #1e2228;
  --chu-phu: #5b6270;
  --vien: #dcdad5;
  --trang: #ffffff;
  --zalo: #0068ff;
  --bo-goc: 10px;
  --rong: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.65;
  color: var(--chu);
  background: var(--trang);
}
img { max-width: 100%; display: block; }
a { color: var(--xanh); }
h1, h2, h3 { line-height: 1.25; color: var(--xanh-dam); margin: 0 0 .6em; }
h1 { font-size: clamp(1.8rem, 4.5vw, 3rem); }
h2 { font-size: clamp(1.45rem, 3vw, 2.1rem); }
h3 { font-size: 1.2rem; }
p { margin: 0 0 1em; }
.khung { max-width: var(--rong); margin: 0 auto; padding: 0 20px; }
.phan { padding: 64px 0; }
.phan-xam { background: var(--da); }
.phu-de { color: var(--chu-phu); max-width: 760px; }
.giua { text-align: center; }
.giua .phu-de { margin-left: auto; margin-right: auto; }

/* --- Đầu trang --- */
.dau-trang {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, .97);
  border-bottom: 1px solid var(--vien);
}
.dau-trang .khung { display: flex; align-items: center; gap: 16px; min-height: 72px; }
.thuong-hieu { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--xanh-dam); }
.thuong-hieu img { height: 52px; width: auto; }
.thuong-hieu strong { font-size: 1.05rem; line-height: 1.2; }
.thuong-hieu small { display: block; font-weight: 400; color: var(--chu-phu); font-size: .8rem; }
.menu { display: flex; gap: 4px; margin-left: auto; }
.menu a {
  padding: 8px 12px; border-radius: 8px; text-decoration: none; color: var(--chu); font-weight: 500; white-space: nowrap;
}
.menu a:hover, .menu a.dang-xem { background: var(--xanh-nhat); color: var(--xanh-dam); }
.nut-goi-dau { white-space: nowrap; }

/* --- Nút --- */
.nut {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 22px; border-radius: 999px; font-weight: 600; text-decoration: none;
  border: 2px solid transparent; cursor: pointer; font-size: 1rem;
}
.nut-chinh { background: var(--xanh); color: #fff; }
.nut-chinh:hover { background: var(--xanh-dam); }
.nut-zalo { background: var(--zalo); color: #fff; }
.nut-vien { border-color: #fff; color: #fff; }
.nut-vien:hover { background: rgba(255, 255, 255, .15); }
.nut-vien-xanh { border-color: var(--xanh); color: var(--xanh); background: #fff; }
.hang-nut { display: flex; flex-wrap: wrap; gap: 12px; }

/* --- Ảnh lớn trang chủ --- */
.anh-lon {
  position: relative; min-height: min(78vh, 680px); display: flex; align-items: flex-end;
  color: #fff; background: #222 center / cover no-repeat;
}
.anh-lon::before {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(8, 15, 50, .15) 0%, rgba(8, 15, 50, .75) 100%);
}
.anh-lon .khung { position: relative; padding-top: 80px; padding-bottom: 56px; width: 100%; }
.anh-lon h1 { color: #fff; max-width: 820px; }
.anh-lon p { font-size: 1.15rem; max-width: 700px; opacity: .95; }

/* --- Đầu trang nhóm sản phẩm --- */
.tieu-de-trang { background: var(--xanh-dam); color: #fff; padding: 48px 0 40px; }
.tieu-de-trang h1 { color: #fff; margin-bottom: .3em; }
.tieu-de-trang p { opacity: .92; max-width: 800px; }
.duong-dan { font-size: .9rem; opacity: .85; margin-bottom: 10px; }
.duong-dan a { color: #fff; }

/* --- Giới thiệu --- */
.hai-cot { display: grid; grid-template-columns: 1.15fr 1fr; gap: 48px; align-items: center; }
.so-lieu { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 24px; }
.so-lieu div { background: var(--trang); border: 1px solid var(--vien); border-radius: var(--bo-goc); padding: 14px; }
.so-lieu b { display: block; font-size: 1.5rem; color: var(--xanh); line-height: 1.2; }
.so-lieu span { font-size: .9rem; color: var(--chu-phu); }
.anh-bo { border-radius: var(--bo-goc); overflow: hidden; box-shadow: 0 10px 30px rgba(0, 0, 0, .12); }

/* --- Thẻ nhóm sản phẩm --- */
.luoi-the { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-top: 32px; }
.the {
  display: flex; flex-direction: column; background: var(--trang); border: 1px solid var(--vien);
  border-radius: var(--bo-goc); overflow: hidden; text-decoration: none; color: var(--chu);
  transition: transform .15s, box-shadow .15s;
}
.the:hover { transform: translateY(-3px); box-shadow: 0 10px 24px rgba(0, 0, 0, .1); }
.the img, .the .anh-thay { aspect-ratio: 4 / 3; object-fit: cover; width: 100%; }
.anh-thay {
  display: flex; align-items: center; justify-content: center; text-align: center; padding: 16px;
  background: linear-gradient(135deg, var(--xanh-dam), var(--xanh)); color: #fff; font-weight: 600;
}
.the div.noi-dung { padding: 16px 18px 20px; }
.the h3 { margin-bottom: .3em; }
.the p { font-size: .95rem; color: var(--chu-phu); margin: 0; }
.the .xem-them { margin-top: 10px; color: var(--xanh); font-weight: 600; font-size: .95rem; }

/* --- Vì sao chọn --- */
.luoi-ly-do { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-top: 28px; }
.ly-do { background: var(--trang); border-radius: var(--bo-goc); padding: 22px; border-top: 4px solid var(--xanh); }
.ly-do h3 { font-size: 1.08rem; }
.ly-do p { color: var(--chu-phu); font-size: .95rem; margin: 0; }

/* --- Thư viện ảnh --- */
.thu-vien { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 12px; margin-top: 20px; }
.thu-vien a { display: block; border-radius: 8px; overflow: hidden; background: var(--da); }
.thu-vien img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; transition: transform .25s; }
.thu-vien a:hover img { transform: scale(1.04); }
.muc-anh + .muc-anh { margin-top: 48px; }

/* --- Thẻ chữ (đá xây dựng) --- */
.luoi-chu { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 24px; }
.the-chu { border: 1px solid var(--vien); border-radius: var(--bo-goc); padding: 22px; background: var(--trang); }
.the-chu h3 { color: var(--xanh); }
.the-chu p { color: var(--chu-phu); margin: 0; }

/* --- Hộp báo giá --- */
.hop-bao-gia {
  margin-top: 48px; padding: 28px; border-radius: var(--bo-goc);
  background: var(--xanh-nhat); display: flex; flex-wrap: wrap; gap: 20px; align-items: center; justify-content: space-between;
}
.hop-bao-gia h2 { font-size: 1.4rem; margin: 0 0 .2em; }
.hop-bao-gia p { margin: 0; color: var(--chu-phu); }

/* --- Liên hệ --- */
.lien-he { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.dong-lien-he { display: flex; gap: 12px; padding: 12px 0; border-bottom: 1px solid var(--vien); }
.dong-lien-he b { min-width: 110px; color: var(--chu-phu); font-weight: 500; }
.dong-lien-he a { font-weight: 600; text-decoration: none; }

/* --- Chân trang --- */
.chan-trang { background: #0a1240; color: #cfd6ee; padding: 40px 0 96px; font-size: .95rem; }
.chan-trang a { color: #fff; }
.chan-trang .khung { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 28px; }
.chan-trang h3 { color: #fff; font-size: 1.05rem; }
.chan-trang ul { list-style: none; padding: 0; margin: 0; }
.chan-trang li { margin-bottom: 6px; }
.ban-quyen { grid-column: 1 / -1; border-top: 1px solid rgba(255, 255, 255, .15); padding-top: 16px; font-size: .85rem; opacity: .8; }

/* --- Nút gọi / Zalo nổi (điện thoại) --- */
.nut-noi { position: fixed; right: 14px; bottom: 14px; z-index: 60; display: none; flex-direction: column; gap: 10px; }
.nut-noi a {
  display: flex; align-items: center; justify-content: center; width: 56px; height: 56px; border-radius: 50%;
  color: #fff; font-weight: 700; font-size: .78rem; text-decoration: none; box-shadow: 0 6px 16px rgba(0, 0, 0, .25);
}
.nut-noi .goi { background: #16a34a; }
.nut-noi .zalo { background: var(--zalo); }

/* --- Xem ảnh lớn --- */
.xem-anh {
  position: fixed; inset: 0; z-index: 100; background: rgba(0, 0, 0, .92);
  display: none; align-items: center; justify-content: center;
}
.xem-anh.mo { display: flex; }
.xem-anh img { max-width: 94vw; max-height: 86vh; border-radius: 6px; }
.xem-anh button {
  position: absolute; background: rgba(255, 255, 255, .15); color: #fff; border: 0; cursor: pointer;
  font-size: 1.8rem; width: 52px; height: 52px; border-radius: 50%;
}
.xem-anh .dong { top: 14px; right: 14px; }
.xem-anh .truoc { left: 12px; top: 50%; transform: translateY(-50%); }
.xem-anh .sau { right: 12px; top: 50%; transform: translateY(-50%); }
.xem-anh .chu-thich { position: absolute; bottom: 14px; left: 0; right: 0; text-align: center; color: #ddd; font-size: .95rem; }

/* --- Màn hình nhỏ --- */
@media (max-width: 980px) {
  .luoi-the, .luoi-ly-do { grid-template-columns: repeat(2, 1fr); }
  .hai-cot, .lien-he { grid-template-columns: 1fr; }
  .chan-trang .khung { grid-template-columns: 1fr 1fr; }
  .nut-goi-dau { display: none; }
}
@media (max-width: 760px) {
  body { font-size: 16px; }
  .phan { padding: 44px 0; }
  .dau-trang .khung { flex-wrap: wrap; gap: 6px; padding-top: 8px; padding-bottom: 6px; min-height: 0; }
  .thuong-hieu img { height: 42px; }
  .menu { order: 3; width: 100%; margin: 0; overflow-x: auto; -webkit-overflow-scrolling: touch; padding-bottom: 4px; }
  .menu a { padding: 6px 10px; font-size: .95rem; }
  .luoi-chu { grid-template-columns: 1fr; }
  .so-lieu { grid-template-columns: 1fr 1fr 1fr; gap: 8px; }
  .so-lieu b { font-size: 1.2rem; }
  .thu-vien { grid-template-columns: repeat(2, 1fr); gap: 8px; }
  .nut-noi { display: flex; }
  .chan-trang .khung { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
  .luoi-the, .luoi-ly-do { grid-template-columns: 1fr; }
}