/* =====================================================================
   GIAO DIEN CHUNG CHO 4 TRANG.
   Doi thuong hieu: sua cac bien trong :root (mau, font, bo goc).
   Day chi la nen trung tinh. Moi trang ban nen co dien mao rieng theo
   thuong hieu cua chu nhan, dung de nguyen neu khach cua ho khong hop.
   ===================================================================== */
:root{
  --mau-chinh:#8A6A2F;        /* vang dong dam: nut, tieu diem */
  --mau-chinh-dam:#1F2023;    /* xam than: nen hero, chan trang */
  --mau-nhan:#D4AF6A;         /* vang dong sang: diem nhan */
  --chu:#1F2023;
  --chu-phu:#5B5A57;
  --nen:#FFFFFF;
  --nen-2:#F7F4EE;
  --vien:#E4DDD0;
  --loi:#B3261E;
  --bo-goc:14px;
  --font-tieu-de:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-than:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--nen);color:var(--chu);font-family:var(--font-than);font-size:17px;line-height:1.7;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:var(--mau-chinh)}
.khung{max-width:1080px;margin:0 auto;padding:0 20px}
.khung-hep{max-width:720px;margin:0 auto;padding:0 20px}
h1,h2,h3{font-family:var(--font-tieu-de);line-height:1.25;margin:0 0 14px;letter-spacing:-.01em}
h1{font-size:clamp(1.9rem,1.3rem + 2.6vw,3.1rem);font-weight:800}
h2{font-size:clamp(1.5rem,1.2rem + 1.4vw,2.2rem);font-weight:800}
h3{font-size:1.15rem;font-weight:700}
p{margin:0 0 14px}
section{padding:64px 0}
.nen-phu{background:var(--nen-2)}
.nhan-nho{display:inline-block;font-size:.8rem;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--mau-chinh);margin-bottom:10px}
.giua{text-align:center}
.mo-ta-muc{color:var(--chu-phu);max-width:640px;margin:0 auto 34px}

/* --- Thanh dau trang --- */
.dau-trang{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.94);backdrop-filter:blur(8px);border-bottom:1px solid var(--vien)}
.dau-trang .khung{display:flex;align-items:center;justify-content:space-between;height:62px}
.thuong-hieu{font-family:var(--font-tieu-de);font-weight:800;color:var(--chu);text-decoration:none;font-size:1.05rem;line-height:1.3;margin-right:12px}
.dau-trang .nut{white-space:nowrap;flex:none}

/* --- Nut --- */
.nut{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--mau-chinh);color:#fff;border:0;border-radius:999px;padding:15px 30px;font:700 1rem var(--font-tieu-de);text-decoration:none;cursor:pointer;transition:transform .12s,box-shadow .12s,background .12s}
.nut:hover{transform:translateY(-1px);box-shadow:0 8px 22px rgba(0,0,0,.14)}
.nut:disabled{opacity:.6;cursor:wait;transform:none;box-shadow:none}
.nut-nho{padding:10px 18px;font-size:.92rem}
.nut-vien{background:transparent;color:var(--mau-chinh);box-shadow:inset 0 0 0 2px var(--mau-chinh)}
.nut-rong{width:100%}

/* --- Hero --- */
.hero{background:var(--mau-chinh-dam);color:#fff;padding:72px 0 80px}
.hero .khung{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center}
.hero .nhan-nho{color:var(--mau-nhan)}
.hero p.phu{font-size:1.12rem;color:rgba(255,255,255,.86);max-width:560px}
.hero .hang-nut{display:flex;flex-wrap:wrap;gap:14px;align-items:center;margin-top:26px}
.hero .nut{background:var(--mau-nhan);color:#1B1B1B}
.hero .ghi-nho{font-size:.92rem;color:rgba(255,255,255,.72)}
.anh-hero{aspect-ratio:4/5;max-width:420px;justify-self:center;width:100%;border-radius:var(--bo-goc);background:linear-gradient(135deg,rgba(255,255,255,.16),rgba(255,255,255,.04));border:1px solid rgba(255,255,255,.18);display:flex;align-items:center;justify-content:center;color:rgba(255,255,255,.55);font-size:.95rem;overflow:hidden}
.anh-hero img{width:100%;height:100%;object-fit:cover;object-position:50% 30%}

/* --- Luoi the --- */
.luoi{display:grid;gap:20px}
.luoi-3{grid-template-columns:repeat(3,1fr)}
.luoi-2{grid-template-columns:repeat(2,1fr)}
.the{background:var(--nen);border:1px solid var(--vien);border-radius:var(--bo-goc);padding:26px}
.the .so{font-family:var(--font-tieu-de);font-weight:800;color:var(--mau-nhan);font-size:1.5rem;margin-bottom:6px}
.the p:last-child{margin-bottom:0}
ul.danh-dau{list-style:none;padding:0;margin:0}
ul.danh-dau li{position:relative;padding-left:30px;margin-bottom:10px}
ul.danh-dau li::before{content:"";position:absolute;left:0;top:.45em;width:18px;height:18px;border-radius:50%;background:var(--mau-chinh) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M20 6 9 17l-5-5'/%3E%3C/svg%3E") center/11px no-repeat}
ul.dau-x li::before{background:#9AA39F url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3.5' stroke-linecap='round'%3E%3Cpath d='M6 6l12 12M18 6 6 18'/%3E%3C/svg%3E") center/10px no-repeat}

/* --- Bang gia --- */
.bang-gia{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:22px;max-width:1040px;margin:0 auto}
.goi{position:relative;background:var(--nen);border:1px solid var(--vien);border-radius:var(--bo-goc);padding:30px 26px;display:flex;flex-direction:column}
.goi.noi-bat{border:2px solid var(--mau-chinh);box-shadow:0 14px 40px rgba(0,0,0,.08)}
.goi .co{position:absolute;top:-13px;left:26px;background:var(--mau-nhan);color:#1b1b1b;font-size:.75rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase;padding:4px 12px;border-radius:999px}
.goi .gia{font-family:var(--font-tieu-de);font-size:2rem;font-weight:800;margin:4px 0 16px}
.goi .gia small{font-size:1rem;font-weight:600;color:var(--chu-phu)}
.goi ul{flex:1;margin-bottom:22px}

/* --- Hoi dap --- */
details{border-bottom:1px solid var(--vien);padding:18px 0}
summary{cursor:pointer;font-weight:700;list-style:none;display:flex;justify-content:space-between;gap:16px}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";font-size:1.4rem;line-height:1;color:var(--mau-chinh)}
details[open] summary::after{content:"\2212"}
details p{margin:12px 0 0;color:var(--chu-phu)}

/* --- Form --- */
.hop-form{background:var(--nen);border:1px solid var(--vien);border-radius:var(--bo-goc);padding:32px;box-shadow:0 14px 40px rgba(0,0,0,.06)}
.o{margin-bottom:16px}
.o label{display:block;font-weight:700;font-size:.92rem;margin-bottom:6px}
.o input,.o select{width:100%;padding:13px 14px;border:1px solid var(--vien);border-radius:10px;font:inherit;background:#fff;color:var(--chu)}
.o input:focus,.o select:focus{outline:2px solid var(--mau-chinh);outline-offset:1px;border-color:transparent}
.bay{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.thong-bao{margin:12px 0 0;font-size:.94rem;text-align:center;color:var(--chu-phu);min-height:1.4em}
.thong-bao.loi{color:var(--loi);font-weight:600}

/* --- Chan trang --- */
.chan-trang{background:var(--mau-chinh-dam);color:rgba(255,255,255,.78);padding:36px 0;font-size:.92rem}
.chan-trang a{color:#fff}
.chan-trang .khung{display:flex;flex-wrap:wrap;gap:12px 28px;justify-content:space-between}

/* --- Trang thanh toan / cam on --- */
.dau-buoc{background:var(--mau-chinh-dam);color:#fff;padding:40px 0 48px;text-align:center}
.dau-buoc .nhan-nho{color:var(--mau-nhan)}
.dau-buoc h1{font-size:clamp(1.6rem,1.2rem + 1.6vw,2.3rem)}
.o-ma{background:var(--nen-2);border:2px dashed var(--mau-chinh);border-radius:var(--bo-goc);padding:16px;text-align:center;margin-bottom:22px}
.o-ma .so-ma{font-family:var(--font-tieu-de);font-size:2rem;font-weight:800;letter-spacing:.12em;color:var(--mau-chinh)}
.luoi-tt{display:grid;grid-template-columns:230px 1fr;gap:26px;align-items:start}
.qr{border:1px solid var(--vien);border-radius:12px;padding:10px;background:#fff}
.dong{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:11px 0;border-bottom:1px solid var(--vien)}
.dong:last-child{border-bottom:0}
.dong span{color:var(--chu-phu);font-size:.94rem;flex:none}
.dong b{text-align:right;word-break:break-word}
.dong .nhan-manh{font-family:var(--font-tieu-de);font-size:1.15rem;color:var(--mau-chinh);letter-spacing:.05em}
.chep{margin-left:8px;border:1px solid var(--vien);background:#fff;border-radius:8px;padding:3px 9px;font-size:.8rem;cursor:pointer;color:var(--chu-phu)}
.trang-thai{display:flex;align-items:center;gap:12px;margin-top:22px;padding:14px 18px;background:var(--nen-2);border-radius:12px;font-size:.95rem}
.xoay{width:18px;height:18px;border-radius:50%;border:3px solid var(--vien);border-top-color:var(--mau-chinh);animation:xoay 1s linear infinite;flex:none}
@keyframes xoay{to{transform:rotate(360deg)}}
.dau-tich{width:72px;height:72px;border-radius:50%;background:rgba(255,255,255,.14);display:flex;align-items:center;justify-content:center;margin:0 auto 18px}

/* --- Dien thoai --- */
@media (max-width:860px){
  .hero .khung{grid-template-columns:1fr}
  .luoi-3{grid-template-columns:1fr}
  .luoi-2{grid-template-columns:1fr}
  section{padding:48px 0}
}
@media (max-width:620px){
  .luoi-tt{grid-template-columns:1fr}
  .qr{max-width:260px;margin:0 auto}
  .hop-form{padding:22px}
  .thuong-hieu{font-size:.95rem}
  .o-ma .so-ma{font-size:1.6rem}
}