/* ===== Bảng màu - đổi vài dòng đầu là đổi toàn bộ tông màu web ===== */
:root{
  --nen:    #0b1020;
  --nen-2:  #121a33;
  --vien:   #24305a;
  --chu:    #e8ecf8;
  --chu-mo: #9aa6c8;
  --nhan:   #f5c451;
  --nhan-2: #4ade80;
  --do:     #ff6b6b;

  --bo-goc: 16px;
  --font: "Be Vietnam Pro", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --rong: 1120px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0; font-family:var(--font); background:var(--nen); color:var(--chu);
  line-height:1.65; -webkit-font-smoothing:antialiased;
}
a{color:inherit}
img{max-width:100%}
.wrap{max-width:var(--rong); margin:0 auto; padding:0 20px}

/* ===== Header ===== */
header{
  position:sticky; top:0; z-index:50;
  background:rgba(11,16,32,.82); backdrop-filter:blur(12px);
  border-bottom:1px solid var(--vien);
}
.nav{display:flex; align-items:center; justify-content:space-between; height:66px; gap:16px}
.logo{display:flex; align-items:center; gap:10px; font-weight:800; font-size:1.05rem; text-decoration:none}
.logo .dot{width:30px;height:30px;border-radius:9px;background:linear-gradient(135deg,var(--nhan),var(--nhan-2));display:grid;place-items:center;color:#0b1020;font-size:15px}
.nav-links{display:flex; gap:26px; font-size:.93rem}
.nav-links a{color:var(--chu-mo); text-decoration:none}
.nav-links a:hover{color:var(--chu)}
@media(max-width:860px){.nav-links{display:none}}

/* ===== Nút ===== */
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  padding:13px 24px; border-radius:12px; border:1px solid transparent;
  font-weight:700; font-size:.96rem; text-decoration:none; cursor:pointer;
  font-family:var(--font); transition:transform .15s ease, opacity .15s ease;
}
.btn:hover{transform:translateY(-2px)}
.btn-chinh{background:linear-gradient(135deg,var(--nhan),#ffd980); color:#14181f}
.btn-phu{background:transparent; color:var(--chu); border-color:var(--vien)}
.btn-phu:hover{border-color:var(--nhan)}
.btn-lon{padding:16px 32px; font-size:1.05rem}
.btn:disabled{opacity:.55; cursor:not-allowed; transform:none}

/* ===== Hero ===== */
.hero{padding:78px 0 64px; text-align:center; position:relative; overflow:hidden}
.hero::before{
  content:""; position:absolute; inset:-40% 20% auto; height:420px;
  background:radial-gradient(ellipse at center, rgba(245,196,81,.16), transparent 68%);
  pointer-events:none;
}
.badge{
  display:inline-block; padding:7px 15px; border-radius:999px; font-size:.82rem;
  background:rgba(245,196,81,.12); color:var(--nhan); border:1px solid rgba(245,196,81,.28); margin-bottom:22px;
}
.hero h1{font-size:clamp(2rem,5.2vw,3.35rem); line-height:1.18; margin:0 0 18px; letter-spacing:-.02em}
.hero h1 .hl{background:linear-gradient(120deg,var(--nhan),var(--nhan-2)); -webkit-background-clip:text; background-clip:text; color:transparent}
.hero p.sub{font-size:clamp(1rem,2.1vw,1.16rem); color:var(--chu-mo); max-width:660px; margin:0 auto 32px}
.hero-cta{display:flex; gap:14px; justify-content:center; flex-wrap:wrap}
.tin-cay{display:flex; gap:26px; justify-content:center; flex-wrap:wrap; margin-top:36px; font-size:.87rem; color:var(--chu-mo)}
.tin-cay span::before{content:"\2713  "; color:var(--nhan-2); font-weight:700}

/* ===== Khối chung ===== */
section{padding:66px 0}
.tieu-de{text-align:center; max-width:640px; margin:0 auto 44px}
.tieu-de h2{font-size:clamp(1.5rem,3.4vw,2.15rem); margin:0 0 12px; letter-spacing:-.01em}
.tieu-de p{color:var(--chu-mo); margin:0}

/* ===== Lưới sản phẩm ===== */
.luoi{display:grid; grid-template-columns:repeat(auto-fill,minmax(300px,1fr)); gap:20px}
.the{
  background:var(--nen-2); border:1px solid var(--vien); border-radius:var(--bo-goc);
  padding:26px; display:flex; flex-direction:column; position:relative;
  transition:border-color .2s ease, transform .2s ease;
}
.the:hover{border-color:rgba(245,196,81,.5); transform:translateY(-3px)}
.the .icon{font-size:2rem; margin-bottom:12px}
.the h3{margin:0 0 6px; font-size:1.14rem}
.the .nhom{font-size:.76rem; color:var(--nhan); text-transform:uppercase; letter-spacing:.06em; margin-bottom:12px}
.the .mota{color:var(--chu-mo); font-size:.93rem; margin:0 0 16px}
.the ul{list-style:none; padding:0; margin:0 0 20px; font-size:.89rem; color:var(--chu-mo)}
.the ul li{padding-left:22px; position:relative; margin-bottom:7px}
.the ul li::before{content:"\2713"; position:absolute; left:0; color:var(--nhan-2); font-weight:700}
.the .day-cuoi{margin-top:auto; display:flex; align-items:center; justify-content:space-between; gap:12px; padding-top:16px; border-top:1px solid var(--vien)}
.the .gia{font-weight:800; color:var(--nhan)}
.the .gia small{display:block; font-weight:400; color:var(--chu-mo); text-decoration:line-through; font-size:.76rem}
.ghim{position:absolute; top:-10px; right:18px; background:var(--nhan); color:#14181f; font-size:.72rem; font-weight:800; padding:4px 11px; border-radius:999px}
.ghim-het{background:var(--vien); color:var(--chu-mo); border:1px solid var(--chu-mo)}
.the.het-hang{opacity:.66}
.the.het-hang:hover{transform:none; border-color:var(--vien)}
.the .nhom .thoi-han{
  color:var(--chu-mo); text-transform:none; letter-spacing:0; margin-left:6px;
}
.the .nhom .thoi-han::before{content:"· "}
.gia-them{display:block; font-weight:600; font-size:.82rem; color:var(--chu-mo); margin-top:2px}

/* ===== Các bước ===== */
.buoc{display:grid; grid-template-columns:repeat(auto-fit,minmax(230px,1fr)); gap:22px; counter-reset:b}
.buoc > div{background:var(--nen-2); border:1px solid var(--vien); border-radius:var(--bo-goc); padding:26px; counter-increment:b}
.buoc > div::before{
  content:counter(b); display:grid; place-items:center; width:38px; height:38px; border-radius:11px;
  background:rgba(245,196,81,.14); color:var(--nhan); font-weight:800; margin-bottom:14px;
}
.buoc h4{margin:0 0 8px; font-size:1.02rem}
.buoc p{margin:0; color:var(--chu-mo); font-size:.91rem}

/* ===== Form ===== */
.khung-form{max-width:620px; margin:0 auto; background:var(--nen-2); border:1px solid var(--vien); border-radius:20px; padding:34px}
.truong{margin-bottom:20px}
.truong label{display:block; font-weight:600; font-size:.92rem; margin-bottom:8px}
.truong label .sao{color:var(--do)}
.truong input[type=text], .truong input[type=tel], .truong input[type=email], .truong textarea{
  width:100%; padding:13px 15px; border-radius:11px; border:1px solid var(--vien);
  background:var(--nen); color:var(--chu); font-family:var(--font); font-size:.98rem;
}
.truong input:focus, .truong textarea:focus{outline:none; border-color:var(--nhan)}
.truong .goi-y{font-size:.82rem; color:var(--chu-mo); margin-top:6px}
.chon-nhieu{display:grid; grid-template-columns:repeat(auto-fill,minmax(210px,1fr)); gap:10px}
.o-chon{
  display:flex; align-items:flex-start; gap:10px; padding:13px 14px; border:1px solid var(--vien);
  border-radius:11px; cursor:pointer; background:var(--nen); font-size:.91rem; transition:border-color .15s;
}
.o-chon:hover{border-color:rgba(245,196,81,.5)}
.o-chon input{margin-top:3px; accent-color:var(--nhan); flex-shrink:0}
.o-chon.da-chon{border-color:var(--nhan); background:rgba(245,196,81,.07)}
.nhan-het{display:block; font-style:normal; font-size:.76rem; color:var(--chu-mo); margin-top:2px}
.dong-y{display:flex; gap:10px; align-items:flex-start; font-size:.86rem; color:var(--chu-mo)}
.dong-y input{margin-top:4px; accent-color:var(--nhan)}
.loi{color:var(--do); font-size:.88rem; margin-top:12px; display:none}
.loi.hien{display:block}

/* ===== Trang chọn sản phẩm ===== */
.thanh-buoc{display:flex; gap:8px; justify-content:center; margin-bottom:30px; font-size:.83rem; color:var(--chu-mo); flex-wrap:wrap}
.thanh-buoc span{padding:6px 14px; border-radius:999px; border:1px solid var(--vien)}
.thanh-buoc span.xong{color:var(--nhan-2); border-color:rgba(74,222,128,.4)}
.thanh-buoc span.dang{color:#14181f; background:var(--nhan); border-color:var(--nhan); font-weight:700}
.nhac{
  background:rgba(74,222,128,.08); border:1px solid rgba(74,222,128,.28);
  border-radius:14px; padding:16px 20px; margin-bottom:26px; font-size:.92rem;
}
.nhac b{color:var(--nhan-2)}
.the.da-bam{opacity:.6}
.ghim-xong{
  position:absolute; top:14px; right:14px; font-size:.74rem; color:var(--nhan-2);
  border:1px solid rgba(74,222,128,.4); border-radius:999px; padding:3px 10px;
}
.hop-link-rieng{
  background:var(--nen-2); border:1px dashed var(--vien); border-radius:14px;
  padding:18px 20px; margin-top:34px; font-size:.9rem; color:var(--chu-mo);
}
.hop-link-rieng .dong{display:flex; gap:10px; margin-top:10px; flex-wrap:wrap}
.hop-link-rieng input{
  flex:1; min-width:240px; padding:11px 14px; border-radius:10px; border:1px solid var(--vien);
  background:var(--nen); color:var(--chu); font-family:var(--font); font-size:.86rem;
}

/* ===== FAQ ===== */
.faq{max-width:760px; margin:0 auto}
.faq details{border:1px solid var(--vien); border-radius:13px; padding:18px 22px; margin-bottom:12px; background:var(--nen-2)}
.faq summary{cursor:pointer; font-weight:600; list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+"; float:right; color:var(--nhan); font-size:1.25rem; line-height:1}
.faq details[open] summary::after{content:"\2212"}
.faq p{color:var(--chu-mo); margin:14px 0 0; font-size:.93rem}

/* ===== CTA cuối + footer ===== */
.cta-cuoi{background:linear-gradient(135deg,rgba(245,196,81,.1),rgba(74,222,128,.07)); border:1px solid var(--vien); border-radius:22px; padding:52px 30px; text-align:center}
.cta-cuoi h2{font-size:clamp(1.5rem,3.4vw,2.1rem); margin:0 0 12px}
.cta-cuoi p{color:var(--chu-mo); max-width:520px; margin:0 auto 26px}
footer{border-top:1px solid var(--vien); padding:34px 0; color:var(--chu-mo); font-size:.87rem}
.chan{display:flex; justify-content:space-between; gap:18px; flex-wrap:wrap}
footer a{color:var(--chu-mo); text-decoration:none}
footer a:hover{color:var(--nhan)}
.mien-tru{margin-top:16px; font-size:.8rem; opacity:.75; max-width:720px}

/* Nút Zalo nổi */
.zalo-noi{
  position:fixed; right:18px; bottom:18px; z-index:60; background:var(--nhan-2); color:#0b1020;
  font-weight:800; padding:13px 19px; border-radius:999px; text-decoration:none; font-size:.92rem;
  box-shadow:0 10px 30px rgba(0,0,0,.4);
}

/* ---------- Ô thông báo đăng ký gần đây ---------- */
.tb-gan-day{
  position:fixed; left:18px; bottom:18px; z-index:60;
  display:flex; align-items:center; gap:10px;
  max-width:min(340px, calc(100vw - 36px));
  padding:11px 13px; border-radius:14px;
  background:var(--nen-2); border:1px solid var(--vien);
  box-shadow:0 14px 40px rgba(0,0,0,.45);
  opacity:0; transform:translateY(14px); pointer-events:none;
  transition:opacity .35s ease, transform .35s ease;
}
.tb-gan-day.hien{opacity:1; transform:translateY(0); pointer-events:auto}
.tb-cham{
  flex:0 0 8px; width:8px; height:8px; border-radius:50%;
  background:#2ecc71; box-shadow:0 0 0 4px rgba(46,204,113,.16);
}
.tb-chu{font-size:.83rem; line-height:1.45; color:var(--chu)}
.tb-chu b{color:var(--nhan); font-weight:700}
.tb-chu em{display:block; font-style:normal; font-size:.74rem; color:var(--chu-mo); margin-top:2px}
.tb-dong{
  margin-left:auto; flex:0 0 auto; background:none; border:0; cursor:pointer;
  color:var(--chu-mo); font-size:1.15rem; line-height:1; padding:2px 4px; border-radius:6px;
}
.tb-dong:hover{color:var(--chu); background:var(--vien)}

@media (max-width:640px){
  .tb-gan-day{left:12px; right:12px; bottom:76px; max-width:none}
}
@media (prefers-reduced-motion:reduce){
  .tb-gan-day{transition:none}
}