/* Nhận diện theo Bài 3 (tokens.css): 60% Kem Giấy, 30% Nâu Mộc, 10% Xanh Mầm (chỉ điểm nhấn).
   Cấm: chữ trắng trên Xanh Mầm, chữ Xanh Mầm trên nền kem, nền chuyển màu, bóng đổ, viền chữ, phông khác. */
:root{
  --nau:#7A4B2A; --xanh:#86B97A; --kem:#FAF5EE; --nau-dam:#3B2414; --xanh-dam:#4A7340; --trang:#FFFFFF;
  --go-sang:#E8D5B9; --go-vua:#C68E58; --van-go:#A77A52;
  --chu-phu:#6B5444; --vien:#EADFCF;
  --van-go-nen:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='480' height='120' viewBox='0 0 480 120'%3E%3Cg fill='none' stroke='%23fff' stroke-opacity='.07' stroke-width='2'%3E%3Cpath d='M0 20c80-14 160 14 240 0s160-14 240 0'/%3E%3Cpath d='M0 48c60-10 140 16 220 4s180-18 260-2'/%3E%3Cpath d='M0 78c90-12 150 12 250 2s150-14 230 0'/%3E%3Cpath d='M0 104c70-8 170 12 240 2s170-12 240 0'/%3E%3Cellipse cx='330' cy='60' rx='26' ry='9'/%3E%3C/g%3E%3C/svg%3E");
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:"Be Vietnam Pro",Arial,sans-serif;background:var(--kem);color:var(--nau-dam);line-height:1.65;font-size:17px;-webkit-text-size-adjust:100%;overflow-x:hidden}
a{color:inherit}
img,video{max-width:100%;display:block}
.khung{max-width:1040px;margin:0 auto;padding:0 20px}
.an-di{display:none !important}

/* Thanh trên */
header.top{position:sticky;top:0;z-index:30;background:var(--kem);border-bottom:1px solid var(--vien)}
.top .khung{display:flex;align-items:center;justify-content:space-between;height:62px;gap:12px}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;font-weight:800;font-size:18px;color:var(--nau)}
.dau{width:38px;height:38px;border-radius:12px;background:var(--nau);color:#fff;display:grid;place-items:center;font-weight:800;position:relative;flex:none}
.dau::after{content:"";position:absolute;right:-5px;top:-5px;width:14px;height:9px;border-radius:9px 0 9px 0;background:var(--xanh);border:2px solid var(--kem)}
nav.menu{display:flex;gap:20px;font-size:15px;font-weight:600}
nav.menu a{text-decoration:none;color:var(--chu-phu)}
nav.menu a:hover{color:var(--nau)}

/* Nút */
.nut{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--nau);color:#fff;text-decoration:none;font-weight:600;padding:12px 22px;border-radius:999px;font-size:16px;border:0;font-family:inherit;cursor:pointer;line-height:1.2}
.nut:hover{background:#68401F}
.nut.vien{background:transparent;color:var(--nau);border:2px solid var(--nau);padding:10px 20px}
.nut.xanh{background:var(--xanh);color:var(--nau-dam)}
.nut.xanh:hover{background:#97C68C}
.nut.nho{padding:8px 16px;font-size:14px}
.nut:disabled{opacity:.55;cursor:wait}

/* Nhãn có thanh mầm */
.nhan{display:inline-flex;align-items:center;gap:10px;font-size:13px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--nau)}
.nhan::before{content:"";width:28px;height:7px;border-radius:7px;background:var(--xanh)}
.nhan.sang{color:var(--go-sang)}

h2{font-size:clamp(28px,4.4vw,40px);font-weight:800;line-height:1.18;margin:12px 0 10px;letter-spacing:-.01em;color:var(--nau-dam)}
.dan{color:var(--chu-phu);max-width:660px;margin-bottom:28px}
section.muc{scroll-margin-top:62px;padding:60px 0;border-top:1px solid var(--vien)}
.the{background:var(--trang);border:1px solid var(--vien);border-radius:28px;padding:24px}
.the h3{font-size:19px;font-weight:700;line-height:1.35;margin-bottom:8px}
.the p{color:var(--chu-phu);font-size:16px}
.luoi{display:grid;gap:16px}
.luoi.bon{grid-template-columns:repeat(4,1fr)}
.luoi.ba{grid-template-columns:repeat(3,1fr)}

/* Khối nền nâu có vân gỗ */
.go{background-color:var(--nau);background-image:var(--van-go-nen);color:#fff;border-radius:40px}

footer{padding:36px 0 44px;color:var(--chu-phu);font-size:14px;text-align:center}
footer a{color:var(--nau);font-weight:600}

@media (max-width:900px){
  nav.menu{display:none}
  .luoi.bon{grid-template-columns:1fr 1fr}
  .luoi.ba{grid-template-columns:1fr}
  section.muc{padding:44px 0}
}
@media (max-width:440px){
  .luoi.bon{grid-template-columns:1fr}
  .logo .ten{display:none}
  body{font-size:16px}
}