:root{--ink:#0F172A;--muted:#475569;--line:#E2E8F0;--bg:#FFFFFF;--soft:#F0F7FF;--gray:#F6F8FB;--navy:#0B3B8C;--blue:#1668E3;--cta:#FF6B00;--cta-d:#D95400;--red:#E11D48;--green:#16A34A;--r:14px}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:#E7ECF3;color:var(--ink);font:16px/1.55 "Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif}
[hidden]{display:none!important}
img,video{display:block;max-width:100%}
a{color:inherit}
.page{max-width:480px;margin:0 auto;background:var(--bg);min-height:100vh;padding-bottom:90px;overflow-x:hidden}
@media(min-width:520px){.page{box-shadow:0 0 40px rgba(15,23,42,.12)}}
section{padding:36px 16px}
h1,h2,h3{margin:0;line-height:1.25;letter-spacing:-.01em}
h1{font-size:25px;font-weight:800}
h2{font-size:22px;font-weight:800;margin-bottom:10px}
h3{font-size:17px;font-weight:700}
p{margin:0 0 12px}
.center{text-align:center}
.muted{color:var(--muted)}
.red{color:var(--red)}
.eyebrow{display:inline-block;font-size:12px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--blue);background:#E3EEFF;padding:4px 10px;border-radius:99px;margin-bottom:10px}

/* Khung media + khung chờ (bản nháp) */
.m{position:relative;aspect-ratio:var(--ar,1/1);overflow:hidden;background:#EEF2F7;border-radius:var(--r)}
.m>img,.m>video,.m>.ph{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.ph{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;padding:10px;text-align:center;border:2px dashed #94A3B8;border-radius:inherit;background:repeating-linear-gradient(45deg,#F1F5F9 0 10px,#E8EEF5 10px 20px);color:#334155;font-size:12px;line-height:1.35}
.ph b{font-size:13px;color:#0F172A;word-break:break-all}
.pack .ph,.pain .ph,.sign .ph{padding:2px;border-width:1.5px}
.pack .ph span,.pain .ph span,.sign .ph span{display:none}
.pack .ph b,.pain .ph b,.sign .ph b{font-size:8.5px;line-height:1.2}

/* Nút */
.btn{display:flex;align-items:center;justify-content:center;gap:8px;width:100%;min-height:58px;padding:12px 16px;border:0;border-radius:14px;background:var(--cta);color:#fff;font-family:inherit;font-weight:800;font-size:17px;line-height:1.2;text-align:center;text-decoration:none;cursor:pointer;box-shadow:0 5px 0 var(--cta-d),0 10px 24px rgba(255,107,0,.3)}
.btn:active{transform:translateY(3px);box-shadow:0 2px 0 var(--cta-d)}
.btn:disabled{opacity:.7;cursor:wait}
.btn-note{margin:12px 0 0;text-align:center;font-size:13.5px;color:var(--muted)}
.btn-line{background:#fff;color:#0068FF;border:2px solid #0068FF;box-shadow:none;min-height:50px;font-size:15px}
.btn-zalo{background:#0068FF;box-shadow:0 5px 0 #0050C4;font-size:15px}
@keyframes pulse{0%,100%{transform:scale(1)}50%{transform:scale(1.025)}}
.pulse{animation:pulse 2.2s ease-in-out infinite}
@media(prefers-reduced-motion:reduce){.pulse{animation:none}html{scroll-behavior:auto}}

/* 1. Hero */
.topbar{background:var(--navy);color:#fff;font-size:13px;font-weight:500;text-align:center;padding:8px 12px}
.hero{padding:0 0 30px}
.hero .m{border-radius:0;--ar:4/5;max-height:44vh;width:100%}
.hero-body{padding:18px 16px 0}
.hero h1 .hl{color:var(--blue)}
.sub{font-size:15.5px;color:#334155;margin:10px 0 16px}
.trust{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:18px}
.trust div{display:flex;align-items:center;gap:8px;background:var(--gray);border:1px solid var(--line);border-radius:12px;padding:9px 10px;font-size:13px;font-weight:600;line-height:1.3}
.trust i{font-style:normal;font-size:20px}

/* 2. Nỗi đau */
.pain{background:var(--gray)}
.pain h2{font-size:21px}
.pain ul{list-style:none;margin:18px 0;padding:0;display:grid;gap:10px}
.pain li{display:flex;gap:12px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:14px;padding:12px}
.pain li .m{flex:0 0 64px;--ar:1/1;border-radius:10px}
.pain li p{margin:0;font-size:15.5px}
.turn{background:var(--navy);color:#fff;border-radius:16px;padding:16px;font-size:16px}
.turn b{color:#FFD29D}

/* 3. Cơ chế */
.mech>.m{margin:18px 0;--ar:1/1}
.pain>.m{--ar:4/3;margin-top:16px}
.feats{margin-top:4px}
.feats+.hint{margin-bottom:22px}
.steps{display:grid;gap:10px}
.step{display:flex;gap:12px;align-items:flex-start;padding:12px;border-radius:14px;background:var(--soft);border:1px solid #D6E6FF}
.step .m{flex:0 0 104px;--ar:1/1;border-radius:10px}
.step p{margin:4px 0 0;font-size:14.5px;line-height:1.5}
.num{position:absolute;top:6px;left:6px;z-index:2;width:28px;height:28px;border-radius:50%;background:var(--blue);color:#fff;font-weight:800;font-size:14px;display:grid;place-items:center;box-shadow:0 0 0 2px #fff}
.hero .m>video,.hero .m>img{object-position:50% 48%}
.benefits{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:22px 0}
.benefit{border:1px solid var(--line);border-radius:14px;padding:14px 12px;background:#fff}
.benefit .ic{font-size:26px;line-height:1}
.benefit h3{font-size:15.5px;margin:8px 0 4px}
.benefit p{font-size:14px;margin:0;color:var(--muted);line-height:1.45}
.tbl{overflow-x:auto;margin:10px 0 22px}
.cmp{width:100%;border-collapse:separate;border-spacing:0;font-size:14px;border:1px solid var(--line);border-radius:14px;overflow:hidden}
.cmp th,.cmp td{padding:10px 8px;border-bottom:1px solid var(--line);text-align:center;vertical-align:middle;line-height:1.35}
.cmp th{background:var(--gray);font-size:13px}
.cmp th:last-child{background:var(--blue);color:#fff}
.cmp td:first-child{text-align:left;font-weight:600}
.cmp td:last-child{background:#F0FDF4;font-weight:600}
.cmp tr:last-child td{border-bottom:0}

/* 4. Bằng chứng */
.proof{background:var(--gray)}
.proof h3{margin:22px 0 10px}
.stats{display:grid;grid-auto-flow:column;grid-auto-columns:1fr;gap:8px;margin:16px 0 4px}
.stats div{background:#fff;border:1px solid var(--line);border-radius:12px;padding:10px 6px;text-align:center}
.stats b{display:block;font-size:20px;font-weight:800;color:var(--navy)}
.stats i{font-style:normal}
.stats span{display:block;font-size:12px;color:var(--muted);line-height:1.3}
.rail{display:flex;gap:12px;overflow-x:auto;scroll-snap-type:x mandatory;margin:0 -16px;padding:4px 16px 10px;scrollbar-width:none}
.rail::-webkit-scrollbar{display:none}
.rail>*{flex:0 0 86%;scroll-snap-align:center}
.rail.chats>*{flex-basis:60%}
.chats .m{--ar:9/16}
.hint{font-size:12.5px;color:var(--muted);text-align:center;margin:0}
.ba{display:grid;grid-template-columns:1fr 1fr;gap:6px;background:#fff;border-radius:16px;padding:6px;border:1px solid var(--line)}
.ba .m{--ar:3/4;border-radius:11px}
.tag{position:absolute;top:8px;left:8px;z-index:2;padding:3px 8px;border-radius:6px;font-size:11px;font-weight:800;color:#fff;background:var(--red)}
.tag.ok{background:var(--green)}
.ugc{max-width:290px;margin:0 auto}
.ugc .m{--ar:9/16}
.reviews{display:grid;gap:12px}
.rv{position:relative;background:#fff;border:1px solid var(--line);border-radius:16px;padding:14px}
.rv-h{display:flex;align-items:center;gap:10px;margin-bottom:6px;padding-right:56px}
.av{flex:0 0 40px;height:40px;border-radius:50%;background:var(--soft);color:var(--navy);font-weight:800;display:grid;place-items:center}
.rv-h b{display:block;font-size:15px;line-height:1.3}
.rv-h small{color:var(--muted);font-size:12.5px}
.stars{color:#F59E0B;letter-spacing:1px;font-size:14px}
.verified{color:var(--green);font-size:12px;font-weight:700;margin-left:6px}
.rv p{font-size:15px;margin:6px 0 10px}
.rv .m{--ar:4/3}
.sample{position:absolute;top:12px;right:12px;background:#FEF3C7;color:#92400E;font-size:11px;font-weight:800;padding:3px 7px;border-radius:6px}

/* 5. Ưu đãi + form */
.offer{background:linear-gradient(#FFF1E4,#FFFFFF 360px)}
.urgent{background:#fff;border:2px solid var(--red);border-radius:16px;padding:12px;text-align:center;margin:14px 0 20px}
.urgent p{margin:0;font-size:14px;font-weight:600}
.timer{display:flex;justify-content:center;gap:6px;margin:8px 0}
.timer span{min-width:52px;padding:6px 4px;border-radius:10px;background:var(--ink);color:#fff;font-size:22px;font-weight:800;font-variant-numeric:tabular-nums;line-height:1.1}
.timer small{display:block;font-size:10px;font-weight:500;opacity:.75}
.gift-left{color:var(--red);font-weight:800}
.packs{display:grid;gap:14px}
.pack{position:relative;display:flex;gap:10px;align-items:center;padding:14px 12px;border:2px solid var(--line);border-radius:16px;background:#fff;cursor:pointer;transition:border-color .15s,box-shadow .15s}
.pack input{position:absolute;opacity:0;pointer-events:none}
.pack.on{border-color:var(--cta);box-shadow:0 0 0 4px rgba(255,107,0,.15);background:#FFFAF5}
.radio{flex:0 0 22px;height:22px;border-radius:50%;border:2px solid #CBD5E1;display:grid;place-items:center}
.pack.on .radio{border-color:var(--cta)}
.pack.on .radio::after{content:"";width:11px;height:11px;border-radius:50%;background:var(--cta)}
.pack .m{flex:0 0 56px;--ar:1/1;border-radius:10px}
.pack-info{flex:1;min-width:0}
.pack-info b{display:block;font-size:16px}
.pack-info small{display:block;color:var(--muted);font-size:12.5px;line-height:1.35}
.pack-info .gift{color:var(--green);font-weight:600;margin-top:2px}
.pack-price{text-align:right;flex:0 0 auto}
.pack-price b{display:block;font-size:18px;font-weight:800;color:var(--red)}
.pack-price s{font-size:12.5px;color:#94A3B8}
.pack-price em{display:block;font-style:normal;font-size:11.5px;font-weight:700;color:var(--green)}
.badge{position:absolute;top:-11px;right:12px;background:var(--cta);color:#fff;font-size:11px;font-weight:800;padding:3px 9px;border-radius:99px;letter-spacing:.03em}
.stack{margin:20px 0 14px;padding:16px;border-radius:16px;background:#fff;border:1.5px dashed #F59E0B}
.stack ul{list-style:none;padding:0;margin:8px 0 10px}
.stack li{display:flex;justify-content:space-between;gap:10px;padding:7px 0;border-bottom:1px dotted var(--line);font-size:14.5px}
.stack li span:last-child{white-space:nowrap;color:var(--muted)}
.stack .total{font-weight:800;text-align:center;font-size:15px;margin:0}
.anchor{font-size:14px;color:var(--muted);font-style:italic;text-align:center;margin:0 0 18px}
.form{background:#fff;border:1px solid var(--line);border-radius:18px;padding:16px;box-shadow:0 10px 30px rgba(15,23,42,.08)}
.form h3{text-align:center;margin-bottom:12px}
.summary{display:flex;justify-content:space-between;align-items:center;background:var(--soft);border-radius:12px;padding:10px 12px;margin:0 0 14px;font-size:15px;font-weight:600}
.summary b{color:var(--red);font-size:18px}
.field{margin-bottom:12px}
.field label{display:block;font-size:14px;font-weight:700;margin-bottom:5px}
.field input{width:100%;min-height:52px;padding:12px 14px;border:1.5px solid #CBD5E1;border-radius:12px;font:inherit;font-size:16px;color:var(--ink);background:#fff}
.field input:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 3px rgba(22,104,227,.15)}
.field .msg{display:none;color:var(--red);font-size:13px;margin-top:4px}
.field.err input{border-color:var(--red)}
.field.err .msg{display:block}
.secure{font-size:13.5px;color:var(--muted);text-align:center;margin:12px 0 0;line-height:1.5}
.form-err{color:var(--red);font-weight:600;text-align:center;font-size:14px;margin:10px 0 0}
.hp{position:absolute;left:-9999px;width:1px;height:1px}

/* 6. Cam kết */
.guard-box{border:2px dashed var(--green);border-radius:18px;padding:18px 16px;background:#F0FDF4}
.shield{width:54px;height:54px;margin:0 auto 8px;color:var(--green)}
.guard-box ol{list-style:none;padding:0;margin:14px 0 0;display:grid;gap:10px}
.guard-box li{background:#fff;border-radius:12px;padding:12px;font-size:15px}
.guard-box li strong{display:block;margin-bottom:2px}
.sign{display:flex;align-items:center;gap:12px;margin-top:14px;font-size:13.5px;color:var(--muted);line-height:1.5}
.sign .m{flex:0 0 52px;--ar:1/1;border-radius:50%}
.sign a{color:var(--green);font-weight:700}

/* 7. FAQ */
.faq details{border:1px solid var(--line);border-radius:14px;margin-bottom:10px;background:#fff}
.faq summary{list-style:none;cursor:pointer;padding:14px 48px 14px 14px;font-weight:700;position:relative;font-size:15.5px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:12px;top:50%;transform:translateY(-50%);width:26px;height:26px;border-radius:50%;background:var(--soft);color:var(--blue);display:grid;place-items:center;font-size:18px}
.faq details[open] summary::after{content:"−"}
.faq details p{padding:0 14px 14px;margin:0;color:#334155;font-size:15px}

/* 8. Chốt cuối + footer */
.final{background:var(--navy);color:#fff;text-align:center}
.final .m{--ar:1/1;margin-bottom:18px}
.final h2{color:#fff}
.chips{display:flex;flex-wrap:wrap;justify-content:center;gap:6px;margin:14px 0}
.chips span{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.2);padding:6px 10px;border-radius:99px;font-size:13px;font-weight:600}
.final .note{font-size:14px;color:#FFD29D;margin:0 0 16px}
footer{background:#07285F;color:#B9C7E0;font-size:13px;padding:22px 16px 30px;text-align:center;line-height:1.7}
footer b{color:#fff;text-transform:uppercase}
footer a{color:#fff}

/* Thanh dính đáy */
.sticky{position:fixed;left:0;right:0;bottom:0;z-index:50;transform:translateY(110%);transition:transform .25s}
.sticky.show{transform:none}
.sticky-in{max-width:480px;margin:0 auto;background:#fff;border-top:1px solid var(--line);box-shadow:0 -8px 24px rgba(15,23,42,.1);padding:10px 12px calc(10px + env(safe-area-inset-bottom));display:flex;align-items:center;gap:10px}
.sticky-price{flex:0 0 auto;line-height:1.2}
.sticky-price small{display:block;font-size:11px;color:var(--muted)}
.sticky-price b{font-size:18px;color:var(--red)}
.sticky .btn{min-height:50px;font-size:15px;box-shadow:0 4px 0 var(--cta-d)}

/* Popup cảm ơn */
.modal{position:fixed;inset:0;z-index:100;background:rgba(15,23,42,.6);display:grid;place-items:center;padding:16px}
.modal-card{background:#fff;border-radius:20px;max-width:420px;width:100%;padding:24px 18px;text-align:center}
.modal-card .big{font-size:44px;line-height:1;margin-bottom:8px}
.link{background:none;border:0;color:var(--muted);text-decoration:underline;font:inherit;margin-top:10px;cursor:pointer;padding:8px}
.draft-note{font-size:12.5px;color:#92400E;background:#FEF3C7;border-radius:8px;padding:8px;margin:10px 0 0}

/* Bảng nháp (chỉ hiện khi xem trên máy) */
.draft{position:fixed;top:8px;left:8px;right:8px;z-index:200;max-width:464px;margin:0 auto;background:#111827;color:#F9FAFB;border-radius:12px;font-size:13px;box-shadow:0 10px 30px rgba(0,0,0,.35)}
.draft summary{padding:10px 12px;cursor:pointer;font-weight:700}
.draft-body{max-height:60vh;overflow:auto;padding:0 12px 12px}
.draft h4{margin:12px 0 4px;font-size:12px;color:#FCD34D;text-transform:uppercase;letter-spacing:.05em}
.draft ul{margin:0;padding-left:18px}
.draft li{margin:3px 0}
.draft code{color:#93C5FD}

/* --- Riêng trang vòi xịt --- */
.hero .m.hero-media{aspect-ratio:auto;height:min(50vh,520px);max-height:none;background:#0B1220}
.hero-media::before{content:"";position:absolute;inset:-30px;background:var(--poster) center/cover no-repeat;filter:blur(22px) brightness(.55)}
.hero .m.hero-media>video,.hero .m.hero-media>img,.hero .m.hero-media>.ph{object-fit:contain;object-position:50% 50%;z-index:1}
.tests-wrap{margin:24px 0 0}
.tests-wrap h3{margin-bottom:10px}
.rail.tests>*{flex-basis:62%}
.tests figure{margin:0}
.tests .m{--ar:9/16}
.tests figcaption{margin-top:6px;font-size:14px;font-weight:700;text-align:center;line-height:1.35}
.benefits+.feats{margin-top:0}
.feats+.hint{margin-bottom:22px}
.stack>.m{--ar:9/16;width:min(240px,70%);margin:10px auto 4px}
.faq details .m{--ar:9/16;width:min(240px,70%);margin:0 auto 14px}
.cross{display:block;margin-top:12px;padding:14px;border-radius:14px;background:var(--soft);border:1px solid #D6E6FF;text-decoration:none;font-size:15px;line-height:1.45}
.cross b{color:var(--blue)}