/* =========================================================
   AI Marketing — trang bán hàng v4 (26/10/2026)
   Bố cục + màu lấy từ trang mẫu Zoom 24/10 (production/zoom-24-10/demo/trang-ban-hang.html)
   ========================================================= */
:root{
  --kem:#fdf6ec; --kem2:#f8ead6; --giay:#fffdf9;
  --do:#a32b2b; --do-dam:#7a1d1d; --cam:#e0603a;
  --vang:#d99a1e; --vang-sang:#f4c75a;
  --chu:#2b1d16; --nhat:#6d5a4c; --vien:#ecd9bf;
  --zalo:#0068ff;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:"Be Vietnam Pro",system-ui,sans-serif;color:var(--chu);background:var(--kem);line-height:1.7;font-size:17px}
img{max-width:100%;display:block}
a{color:inherit}
.khung{max-width:1080px;margin:0 auto;padding:0 16px}
.hep{max-width:820px}
section{padding:64px 0;position:relative}
section[id]{scroll-margin-top:64px}
.nhan{display:inline-block;font-size:13px;font-weight:700;letter-spacing:1.5px;text-transform:uppercase;color:var(--do);background:#fbe3d6;padding:6px 14px;border-radius:99px}
h2{font-size:clamp(26px,4vw,38px);line-height:1.25;margin:14px 0 14px;color:var(--do-dam)}
h2 em,.nghieng{font-family:"Playfair Display",serif;font-style:italic;color:var(--vang);font-weight:700}
.giua{text-align:center}
.dan{color:var(--nhat);max-width:720px;margin:0 auto 28px}

/* nút */
.nut{display:inline-block;text-decoration:none;text-align:center;font-weight:800;letter-spacing:.3px;color:#fff;background:linear-gradient(135deg,var(--cam),var(--do));padding:17px 30px;border-radius:14px;box-shadow:0 10px 24px rgba(163,43,43,.28);text-transform:uppercase;font-size:16px;line-height:1.4;transition:transform .15s;border:0;cursor:pointer;font-family:inherit}
.nut:hover{transform:translateY(-2px)}
.nut-vien{display:inline-block;text-decoration:none;font-weight:600;color:var(--do);padding:12px 20px}
.nut-phu{background:#fff;color:var(--do);border:2px solid var(--do);box-shadow:none}
.nut-zalo{background:var(--zalo);box-shadow:0 10px 24px rgba(0,104,255,.25)}
.cta{text-align:center;margin-top:34px}

/* thanh trên */
.thanh{position:sticky;top:0;z-index:50;background:linear-gradient(90deg,var(--do-dam),var(--do));color:#fff}
.thanh .khung{display:flex;align-items:center;justify-content:space-between;gap:12px;padding-top:10px;padding-bottom:10px}
.thanh b{font-size:13px;letter-spacing:1px}
.thanh nav{display:flex;align-items:center;gap:18px;font-size:14px}
.thanh nav a{text-decoration:none;color:#fde9df}
.thanh nav a.qua{color:var(--vang-sang);font-weight:700}
.mo-menu{display:none;background:none;border:1px solid rgba(255,255,255,.45);color:#fff;border-radius:10px;font-size:18px;line-height:1;padding:7px 10px;cursor:pointer}
.thanh .giu-cho{background:var(--vang-sang);color:var(--do-dam);text-decoration:none;font-weight:700;font-size:14px;padding:8px 16px;border-radius:99px;white-space:nowrap}

/* 1–2 · tiêu đề */
.dau{padding:40px 0 30px;background:radial-gradient(ellipse at top,#fff 0%,var(--kem) 70%)}
.bang{background:linear-gradient(135deg,#f2b8a0,#e98a6a 40%,#d9663f);border-radius:22px;padding:34px 24px;text-align:center;color:#fff;box-shadow:0 18px 40px rgba(200,90,50,.25)}
.bang .goi{font-size:14px;font-weight:700;letter-spacing:1.5px;opacity:.95}
.bang h1{font-size:clamp(28px,4.6vw,46px);line-height:1.2;margin:12px 0 10px;text-transform:uppercase;font-weight:800;text-shadow:0 2px 8px rgba(120,30,10,.25)}
.dau .khac{text-align:center;font-size:14px;color:var(--nhat);margin:14px 0 0}
.dau .khac a{color:var(--do);font-weight:700}
.bang .ngay-ca{margin:12px 0 0;font-size:16px;font-weight:600;color:#fff}
.bang .phu-de{font-family:"Playfair Display",serif;font-style:italic;font-size:clamp(22px,3.2vw,32px);color:#fff4c9}
.mo{max-width:780px;margin:30px auto 0;text-align:center}
.mo .lon{font-size:clamp(20px,2.6vw,26px);font-weight:700;margin:0 0 14px}
.mo .lon b{color:var(--do)}
.mo p{color:var(--nhat)}
.mo p b{color:var(--chu)}
.the3{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:30px auto 0;max-width:860px}
.the3 div{background:var(--giay);border:1px solid var(--vien);border-radius:14px;padding:16px;text-align:center}
.the3 i{font-style:normal;font-size:24px}
.the3 small{display:block;font-size:12px;letter-spacing:1px;color:var(--nhat);text-transform:uppercase;margin-top:4px}
.the3 strong{display:block;font-size:18px;color:var(--do-dam)}
.link-phu{text-align:center;margin:14px 0 0;font-size:14px;color:var(--nhat)}
.link-phu a{color:var(--do);font-weight:600}

/* đếm ngược */
.dem{max-width:620px;margin:30px auto 0;background:var(--giay);border:1px solid var(--vien);border-radius:18px;padding:20px;text-align:center}
.dem p{margin:0;color:var(--nhat);font-size:15px}
.dem p b{color:var(--chu)}
.dem .so{display:flex;justify-content:center;gap:12px;margin-top:12px}
.dem .so div{background:linear-gradient(160deg,var(--do),var(--do-dam));color:#fff;border-radius:12px;min-width:70px;padding:10px 6px}
.dem .so b{display:block;font-size:28px;line-height:1.1}
.dem .so span{font-size:12px;opacity:.85}

/* 3 · nỗi đau */
.dau-tim{background:var(--kem2)}
.luoi{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.o{background:var(--giay);border-radius:16px;padding:20px;border:1px solid var(--vien)}
.o i{font-style:normal;font-size:28px}
.o h3{margin:6px 0 6px;font-size:16px;color:var(--do-dam);text-transform:uppercase;letter-spacing:.4px}
.o p{margin:0;font-size:15px;color:var(--nhat)}
.chot{text-align:center;max-width:760px;margin:30px auto 0;font-size:19px}
.chot b{color:var(--do)}

/* quà tặng */
.qua-luoi{display:grid;grid-template-columns:1fr 1fr;gap:20px;max-width:960px;margin:0 auto}
.qua-luoi.mot{grid-template-columns:1fr;max-width:560px}
.zalo-luoi.hai{grid-template-columns:repeat(2,1fr);max-width:640px}
.qua-the{background:var(--giay);border:1px solid var(--vien);border-radius:22px;padding:24px;display:flex;flex-direction:column}
.qua-the.chinh{border:3px solid var(--do);box-shadow:0 18px 40px rgba(163,43,43,.14)}
.qua-the small{font-weight:700;color:var(--cam);letter-spacing:1px;text-transform:uppercase;font-size:13px}
.qua-the h3{margin:4px 0 8px;font-size:21px;color:var(--do-dam)}
.qua-the p{margin:0 0 14px;color:var(--nhat);font-size:15px}
.qua-the figure{margin:0 0 16px;border-radius:14px;overflow:hidden;border:1px solid var(--vien);background:#fff}
.qua-the figure img{max-height:300px;width:100%;object-fit:cover;object-position:top}
.qua-the figcaption{padding:10px 14px;font-size:13px;color:var(--nhat)}
.qua-the .nut{margin-top:auto;width:100%}
.qua-the .nut-vien{text-align:center}
.qua-ghi{text-align:center;max-width:760px;margin:22px auto 0;color:var(--nhat);font-size:15px}

/* 4 · uy tín, 5 · câu chuyện */
.chung-nhan{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-bottom:40px}
.chung-nhan div{background:linear-gradient(160deg,var(--do),var(--do-dam));color:#fff;border-radius:16px;padding:20px;text-align:center}
.chung-nhan b{display:block;font-size:26px;color:var(--vang-sang);line-height:1.2}
.chung-nhan span{font-size:14px;opacity:.92}
.chuyen{display:grid;grid-template-columns:300px 1fr;gap:34px;align-items:start}
.chuyen img{border-radius:20px;box-shadow:0 14px 30px rgba(0,0,0,.15)}
.chuyen blockquote{margin:0 0 16px;font-family:"Playfair Display",serif;font-style:italic;font-size:21px;color:var(--do-dam);border-left:4px solid var(--vang);padding-left:16px}
.truoc-sau{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:22px}
.truoc-sau div{border-radius:14px;padding:16px 18px;font-size:15px}
.truoc-sau .t{background:#f3e7dc;color:var(--nhat)}
.truoc-sau .s{background:#fff4d8;border:2px solid var(--vang)}
.truoc-sau h4{margin:0 0 6px;font-size:14px;text-transform:uppercase;letter-spacing:1px}

/* 6 · 7 nhân viên AI */
.nv{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.nv div{background:var(--giay);border:1px solid var(--vien);border-radius:16px;padding:20px 16px;text-align:center}
.nv i{font-style:normal;font-size:32px}
.nv h3{font-size:16px;margin:8px 0 6px;color:var(--do-dam)}
.nv p{font-size:14px;color:var(--nhat);margin:0}

/* 7 · cảm xúc */
.cam-xuc{background:linear-gradient(160deg,var(--do-dam),#4d1212);color:#fff}
.cam-xuc h2{color:#fff}
.cam-xuc p{font-size:18px;opacity:.95}
.cam-xuc .nghieng{color:var(--vang-sang)}

/* 8 · lộ trình + dành cho ai */
.lo-trinh{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.lo-trinh div{background:var(--giay);border-radius:18px;padding:22px;border-top:5px solid var(--do)}
.lo-trinh small{font-weight:700;color:var(--cam);letter-spacing:1px;text-transform:uppercase;font-size:13px}
.lo-trinh h3{margin:6px 0 8px;font-size:19px;color:var(--do-dam)}
.lo-trinh ul{margin:0;padding-left:18px;color:var(--nhat);font-size:15px}
.dong-hanh{max-width:900px;margin:22px auto 0;background:var(--giay);border:2px dashed var(--vang);border-radius:18px;padding:18px 22px;font-size:16px}
.chi-can{max-width:900px;margin:16px auto 0;display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.chi-can div{background:#fff4d8;border-radius:14px;padding:14px 16px;font-size:15px}
.chi-can b{display:block;color:var(--do-dam)}
.ai-hop{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:40px}
.chua-hop{margin-top:18px;text-align:center;color:var(--nhat);font-size:15px}

/* 9 · cầm về */
.cam-ve{display:grid;grid-template-columns:1fr 1fr;gap:30px;align-items:start}
.cam-ve img{border-radius:18px;box-shadow:0 14px 30px rgba(0,0,0,.15)}
.dau-tich{list-style:none;padding:0;margin:0}
.dau-tich li{padding:9px 0 9px 36px;position:relative;border-bottom:1px dashed var(--vien);font-size:16px}
.dau-tich li:before{content:"✓";position:absolute;left:0;top:9px;width:24px;height:24px;border-radius:50%;background:var(--do);color:#fff;font-size:14px;display:grid;place-items:center;font-weight:700}
.dau-tich li.tang:before{content:"🎁";background:none;font-size:18px}
.gia-tri{margin-top:22px;background:linear-gradient(160deg,var(--do),var(--do-dam));color:#fff;border-radius:18px;padding:20px 22px;font-size:16px}
.gia-tri b{color:var(--vang-sang)}
.gia-tri small{display:block;margin-top:8px;opacity:.8;font-size:13px}

/* 11 · vì sao ngay */
.vi-sao{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.vi-sao div{background:var(--giay);border-radius:16px;padding:22px;border:1px solid var(--vien)}
.vi-sao b{font-size:34px;color:var(--vang);font-family:"Playfair Display",serif;font-style:italic;line-height:1}
.vi-sao h3{margin:6px 0;font-size:17px;color:var(--do-dam)}
.vi-sao p{margin:0;font-size:15px;color:var(--nhat)}

/* 12–14 · giá */
.gia-nen{background:var(--kem2)}
.goi-gia{display:grid;grid-template-columns:1fr 1.15fr;gap:20px;align-items:stretch;max-width:900px;margin:0 auto}
.the-gia{background:var(--giay);border:1px solid var(--vien);border-radius:22px;padding:28px;display:flex;flex-direction:column}
.the-gia.chinh{border:3px solid var(--do);position:relative;box-shadow:0 18px 40px rgba(163,43,43,.18)}
.the-gia .ruy-bang{position:absolute;top:-15px;left:50%;transform:translateX(-50%);background:var(--do);color:#fff;font-size:13px;font-weight:700;padding:5px 16px;border-radius:99px;white-space:nowrap}
.the-gia h3{margin:0;font-size:20px;color:var(--do-dam);text-transform:uppercase}
.the-gia .mo-ta{color:var(--nhat);font-size:14px;margin:4px 0 14px}
.the-gia ul{list-style:none;padding:0;margin:0 0 18px;flex:1}
.the-gia li{padding:7px 0 7px 28px;position:relative;font-size:15px}
.the-gia li:before{content:"✓";position:absolute;left:0;color:var(--do);font-weight:800}
.the-gia li.khong{color:#a99b8f}
.the-gia li.khong:before{content:"–";color:#c8b8a8}
.the-gia .tien{font-size:15px;color:var(--nhat)}
.the-gia .tien b{font-size:34px;color:var(--do);display:block;line-height:1.2}
.the-gia .nut{margin-top:14px}
.neo{max-width:900px;margin:26px auto 0;display:grid;grid-template-columns:1fr 1fr;gap:16px}
.neo div{background:var(--giay);border-radius:16px;padding:20px;border:1px solid var(--vien);font-size:15px}
.neo h4{margin:0 0 6px;color:var(--do-dam);font-size:16px}
.uu-dai{max-width:900px;margin:18px auto 0;background:linear-gradient(135deg,#fff4d8,#ffe6a8);border:2px solid var(--vang);border-radius:18px;padding:20px 22px;font-size:16px}
.gioi-han{max-width:900px;margin:16px auto 0;text-align:center;font-size:16px}

/* 15 · chứng thực */
.chung-thuc{display:grid;grid-template-columns:280px 1fr;gap:28px;align-items:start;max-width:960px;margin:0 auto}
.chung-thuc img{border-radius:18px;box-shadow:0 14px 30px rgba(0,0,0,.18)}
.loi{display:grid;gap:14px}
.loi blockquote{margin:0;background:var(--giay);border:1px solid var(--vien);border-left:5px solid var(--vang);border-radius:14px;padding:18px 20px;font-family:"Playfair Display",serif;font-style:italic;font-size:20px;color:var(--do-dam)}
.loi cite{display:block;margin-top:8px;font-family:"Be Vietnam Pro",sans-serif;font-style:normal;font-size:14px;color:var(--nhat);font-weight:600}

/* 10 · hỏi đáp */
details{background:var(--giay);border:1px solid var(--vien);border-radius:14px;margin-bottom:10px;padding:0 20px}
summary{cursor:pointer;font-weight:700;padding:16px 0;color:var(--do-dam);list-style:none;position:relative;padding-right:28px}
summary::-webkit-details-marker{display:none}
summary:after{content:"+";position:absolute;right:0;top:12px;font-size:24px;color:var(--do)}
details[open] summary:after{content:"–"}
details p{margin:0 0 16px;color:var(--nhat);font-size:15.5px}

/* 16 · đăng ký */
.buoc3{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;max-width:900px;margin:0 auto}
.buoc3 div{background:var(--giay);border-radius:16px;padding:20px;border:1px solid var(--vien);text-align:center}
.buoc3 b{display:inline-grid;place-items:center;width:40px;height:40px;border-radius:50%;background:var(--do);color:#fff;font-size:18px}
.buoc3 h3{font-size:16px;margin:10px 0 4px;color:var(--do-dam)}
.buoc3 p{margin:0;font-size:14px;color:var(--nhat)}
.dk-hop{max-width:620px;margin:28px auto 0}
.dk-the{background:var(--giay);border:2px solid var(--do);border-radius:22px;padding:26px 24px}
.dk-the h3{margin:0 0 4px;font-size:22px;color:var(--do-dam)}
.dk-ghi{margin:0 0 14px;font-size:14px;color:var(--nhat)}
.dk-the label{display:block;margin:12px 0 6px;font-weight:700;font-size:14px}
.dk-the label span{font-weight:500;color:#9b8a7c}
.dk-the input,.dk-the select{width:100%;padding:13px 14px;border-radius:12px;border:1px solid var(--vien);background:#fff;color:var(--chu);font:inherit;font-size:16px}
.dk-the .nut{width:100%;margin-top:18px}
.toast{display:none;margin-top:10px;color:#b3261e;font-size:14px}
.toast.show{display:block}
.ck-the[hidden]{display:none}
.ck-goi-y{margin:0 0 14px;color:var(--nhat)}
.ck-qr{display:flex;flex-direction:column;align-items:center;gap:8px;margin-bottom:14px}
.ck-qr img{width:260px;max-width:100%;height:auto;padding:10px;border-radius:14px;background:#fff;border:1px solid var(--vien)}
.ck-qr small{color:var(--nhat)}
.ck-mo-app{font:inherit;font-weight:700;padding:10px 16px;border-radius:12px;border:0;background:var(--zalo);color:#fff;cursor:pointer}
.ck-dong{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:9px 0;border-bottom:1px dashed var(--vien);font-size:15px;flex-wrap:wrap}
.ck-dong small{color:var(--nhat);font-size:14px}
.ck-dong b{margin-left:auto}
.ck-tien{color:var(--do);font-size:19px}
.ck-chep{border:1px solid var(--vien);background:#fff;border-radius:8px;padding:3px 10px;font:600 12px "Be Vietnam Pro",sans-serif;cursor:pointer;color:var(--do)}
.ck-ghi{margin:14px 0 0;font-size:14px;color:var(--nhat)}
.ck-doi{display:inline-block;margin-top:12px;font-size:14px;color:var(--nhat)}
.ck-pop{position:fixed;inset:0;z-index:70;display:flex;align-items:flex-end;justify-content:center;background:rgba(0,0,0,.55)}
.ck-pop[hidden]{display:none}
.ck-pop-hop{position:relative;width:min(520px,100%);max-height:88vh;overflow:auto;padding:22px 18px 26px;border-radius:22px 22px 0 0;background:#fff;color:var(--chu)}
.ck-pop-hop h3{margin:0 0 10px}
.ck-pop-dong{position:absolute;top:8px;right:14px;font-size:26px;background:none;border:0;color:var(--nhat);cursor:pointer}
.ck-app-buoc{padding-left:20px;display:grid;gap:8px;font-size:14px}
.ck-app-luoi{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:14px}
.ck-app-o{display:flex;flex-direction:column;align-items:center;gap:6px;padding:10px 6px;border-radius:14px;background:var(--kem);font-size:12px;text-align:center;text-decoration:none;color:var(--chu)}
.ck-app-o img,.ck-app-o i{width:40px;height:40px;border-radius:10px;object-fit:contain;display:grid;place-items:center;font-style:normal;font-weight:800;background:#fff}

/* nhóm Zalo */
.zalo-luoi{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;max-width:900px;margin:0 auto}
.zalo-vao{display:flex;justify-content:center;align-items:center;gap:22px;margin-top:26px}
.zalo-vao img{width:120px;height:120px;padding:8px;border-radius:14px;background:#fff;border:1px solid var(--vien)}
.zalo-vao small{display:block;margin-top:8px;color:var(--nhat)}

/* cuối */
.ket{background:linear-gradient(160deg,var(--do),var(--do-dam));color:#fff;text-align:center}
.ket h2{color:#fff}
.ket .nut{background:var(--vang-sang);color:var(--do-dam)}
footer{background:#2b1010;color:#d9c3b5;text-align:center;padding:22px 16px 90px;font-size:14px}
footer a{color:var(--vang-sang)}
.day{position:fixed;left:0;right:0;bottom:0;z-index:55;background:#fff;border-top:1px solid var(--vien);box-shadow:0 -6px 18px rgba(0,0,0,.08)}
.day .khung{display:flex;align-items:center;justify-content:space-between;gap:12px;padding-top:10px;padding-bottom:10px}
.day span{font-size:14px;color:var(--nhat)}
.day span b{color:var(--do)}
.day a{background:linear-gradient(135deg,var(--cam),var(--do));color:#fff;text-decoration:none;font-weight:700;padding:11px 20px;border-radius:12px;white-space:nowrap;font-size:15px}

@media (max-width:900px){
  .thanh nav{display:none}
  .mo-menu{display:block}
  .thanh .khung{flex-wrap:wrap}
  .thanh b{flex:1}
  .thanh nav.mo{display:flex;flex-direction:column;align-items:stretch;gap:0;width:100%;order:3;font-size:16px}
  .thanh nav.mo a{padding:13px 4px;border-top:1px solid rgba(255,255,255,.18)}
  .luoi,.chung-nhan,.ai-hop,.nv,.lo-trinh{grid-template-columns:repeat(2,1fr)}
  .vi-sao,.buoc3,.chi-can,.zalo-luoi{grid-template-columns:1fr}
  .chuyen,.cam-ve,.goi-gia,.neo,.qua-luoi,.chung-thuc{grid-template-columns:1fr}
  .chuyen img{max-width:260px;margin:0 auto}
  .chung-thuc img{max-width:300px;margin:0 auto}
  .the-gia.chinh{order:-1}
}
@media (max-width:560px){
  body{font-size:16px}
  section{padding:48px 0}
  .the3{grid-template-columns:1fr}
  .luoi,.chung-nhan,.ai-hop,.nv,.truoc-sau,.lo-trinh{grid-template-columns:1fr}
  .dem .so div{min-width:60px}
  .nut{padding:15px 18px;font-size:15px;width:100%}
  .thanh b{font-size:11px}
  .thanh b .phu{display:none}
  .day span{display:none}
  .day a{width:100%;text-align:center}
  .zalo-vao img,.zalo-vao small{display:none}
  .zalo-vao>div{width:100%}
  .dk-the{padding:22px 16px}
}

/* Ngắt dòng cân đối: không để một chữ lẻ rơi xuống dòng cuối */
h1,h2,h3,.phu-de,.ngay-ca,.goi,.nhan,.dan,blockquote,strong{text-wrap:balance}
/* Vế nghiêng của tiêu đề xuống dòng nguyên cụm, không bị cắt giữa chừng */
h2 em,h2 .nghieng{display:inline-block}
p,li,figcaption,summary{text-wrap:pretty}