/* MẪU V4 — "kiểu sàn TMĐT": ảnh sản phẩm trượt ngang + dải giá + cam kết + form, tông cam/trắng như trang sản phẩm sàn.
   Bố cục tham khảo trang đối thủ (LadiPage), nội dung/ảnh/video là của shop. app.js giữ nguyên nên tên class/id không đổi. */
:root{--ink:#222;--muted:#757575;--line:#E8E8E8;--bg:#F5F5F5;--card:#fff;--soft:#FFF4F0;--brand:#EE4D2D;--brand-d:#C8381B;--red:#D0011B;--green:#26AA99;--gold:#F59E0B;--r:12px}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.5 "Inter",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:84px;overflow-x:hidden}
@media(min-width:520px){.page{box-shadow:0 0 40px rgba(0,0,0,.12)}}
section{padding:16px;background:#fff;margin-bottom:8px}
h1,h2,h3{margin:0;line-height:1.3}
h1{font-size:17px;font-weight:600;margin:10px 0 6px}
h2{font-size:18px;font-weight:800}
h3{font-size:15.5px;font-weight:700}
p{margin:0 0 10px}
.muted{color:var(--muted)}
.red{color:var(--red)}
.sec-title{position:relative;padding-left:12px;margin-bottom:12px;font-size:17px;text-transform:uppercase;letter-spacing:.02em}
.sec-title::before{content:"";position:absolute;left:0;top:3px;bottom:3px;width:4px;border-radius:2px;background:var(--brand)}

/* Khung media + khung chờ (bản nháp) */
.m{position:relative;aspect-ratio:var(--ar,1/1);overflow:hidden;background:#EEE;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,.sign .ph{padding:2px;border-width:1.5px}
.pack .ph span,.sign .ph span{display:none}
.pack .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:52px;padding:12px 16px;border:0;border-radius:8px;background:var(--brand);color:#fff;font-family:inherit;font-weight:800;font-size:16px;line-height:1.2;text-align:center;text-decoration:none;cursor:pointer;box-shadow:0 4px 12px rgba(238,77,45,.35)}
.btn:active{transform:translateY(2px);box-shadow:none}
.btn:disabled{opacity:.7;cursor:wait}
.btn-line{background:#fff;color:var(--brand);border:1.5px solid var(--brand);box-shadow:none;min-height:46px;font-size:15px;margin-top:12px}
@keyframes pulse{0%,100%{transform:scale(1)}50%{transform:scale(1.02)}}
.pulse{animation:pulse 2.2s ease-in-out infinite}
@media(prefers-reduced-motion:reduce){.pulse{animation:none}html{scroll-behavior:auto}}

/* Thanh điều hướng đầu trang */
.tabs{position:sticky;top:0;z-index:40;display:flex;background:#fff;border-bottom:1px solid var(--line);box-shadow:0 2px 8px rgba(0,0,0,.06)}
.tabs a{flex:1;text-align:center;padding:12px 4px;font-size:13.5px;font-weight:700;color:var(--muted);text-decoration:none;border-bottom:2px solid transparent}
.tabs a.on{color:var(--brand);border-bottom-color:var(--brand)}

/* 1. Ảnh sản phẩm */
.gallery{padding-top:0;margin-bottom:8px}
.gal-main{position:relative;margin:0 -16px;background:#fff}
.gal-track{display:flex;overflow-x:auto;scroll-snap-type:x mandatory;scrollbar-width:none}
.gal-track::-webkit-scrollbar{display:none}
.gal-track>.m{flex:0 0 100%;scroll-snap-align:start;border-radius:0;--ar:1/1;background:#fff}
.gal-track>.m>img{object-fit:cover}
.gal-btn{position:absolute;top:50%;transform:translateY(-50%);width:34px;height:34px;border:0;border-radius:50%;background:rgba(0,0,0,.35);color:#fff;font-size:24px;line-height:1;cursor:pointer;display:grid;place-items:center}
.gal-btn.prev{left:8px}.gal-btn.next{right:8px}
.gal-count{position:absolute;right:10px;bottom:10px;background:rgba(0,0,0,.55);color:#fff;font-size:12px;font-weight:600;padding:3px 9px;border-radius:99px}
.gal-tag{position:absolute;left:10px;top:10px;background:rgba(0,0,0,.6);color:#fff;font-size:12px;font-weight:700;padding:4px 9px;border-radius:99px}
.thumbs{display:flex;gap:6px;margin:8px -16px 0;padding:0 16px 4px;overflow-x:auto;scrollbar-width:none}
.thumbs::-webkit-scrollbar{display:none}
.thumbs button{flex:0 0 64px;height:64px;padding:0;border:2px solid var(--line);border-radius:8px;background:#fff;overflow:hidden;cursor:pointer}
.thumbs button.on{border-color:var(--brand)}
.thumbs img{width:100%;height:100%;object-fit:cover}
.pricebar{display:flex;align-items:center;justify-content:space-between;gap:10px;margin:10px -16px 0;padding:10px 16px;background:linear-gradient(90deg,var(--brand),#FF7A45);color:#fff}
.pb-price{display:flex;align-items:baseline;flex-wrap:wrap;gap:4px 8px;line-height:1.1}
.pb-price small{font-size:12px;opacity:.9}
.pb-price b{font-size:24px;font-weight:800}
.pb-old{font-size:14px;opacity:.85;text-decoration:line-through}
.pb-off{display:inline-block;font-style:normal;font-size:12px;font-weight:800;background:#FFE600;color:#D0011B;border-radius:4px;padding:1px 6px}
.pb-gift{flex-basis:100%;font-size:12.5px;font-weight:700}
.pb-ship{text-align:right;font-size:11.5px;line-height:1.35;flex:0 0 auto}
.pb-ship b{display:block;font-size:12.5px}
.meta{display:flex;align-items:center;gap:8px;flex-wrap:wrap;font-size:13px;color:var(--muted);margin:0 0 10px}
.meta b{color:var(--ink)}
.meta .sep{color:var(--line)}
.promo-line{display:flex;justify-content:space-between;align-items:center;gap:8px;background:var(--soft);border:1px dashed var(--brand);border-radius:8px;padding:9px 12px;font-size:13.5px;font-weight:700;color:var(--brand);text-decoration:none;margin-bottom:10px}
.promo-line i{font-style:normal;font-size:20px;line-height:1}
.chips{display:grid;grid-template-columns:repeat(3,1fr);gap:6px;margin-bottom:10px}
.chip{border:1px solid #F8C9BC;background:#FFF8F5;border-radius:8px;padding:7px 6px;text-align:center;line-height:1.25}
.chip b{display:block;font-size:13px;color:var(--brand)}
.chip span{display:block;font-size:11px;color:var(--muted);margin-top:2px}
.shipline{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:10px 0;margin-bottom:10px}
.shipline>div{display:flex;gap:10px;align-items:flex-start}
.shipline i{font-style:normal;font-size:20px;line-height:1.1}
.shipline b{display:block;font-size:13.5px}
.shipline span{display:block;font-size:12.5px;color:var(--muted);line-height:1.4}
.assure{display:grid;grid-template-columns:1fr 1fr;gap:6px 10px;font-size:12.5px;font-weight:600}
.assure div{display:flex;align-items:center;gap:6px}
.assure i{font-style:normal;font-size:16px}

/* 2. Khan hiếm + đặt hàng */
.order{background:var(--bg);padding:0 0 8px}
.scarce{display:flex;justify-content:space-between;align-items:center;gap:8px;flex-wrap:wrap;background:#FFF1F0;color:var(--red);font-size:12.5px;font-weight:700;padding:8px 16px;line-height:1.3}
.timer{display:inline-flex;gap:3px;font-variant-numeric:tabular-nums}
.timer b{background:var(--ink);color:#fff;border-radius:4px;padding:1px 5px;font-size:12.5px}
.order-card{background:#fff;padding:14px 16px 16px}
.order-card>h2{font-size:17px;margin-bottom:10px}
.packs{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:8px}
.pack{position:relative;display:flex;flex-direction:column;align-items:center;text-align:center;padding:12px 6px 10px;border:1.5px solid var(--line);border-radius:10px;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(--brand);background:var(--soft);box-shadow:0 0 0 2px rgba(238,77,45,.2)}
.pack .radio{display:none}
.pack .m{width:60px;--ar:1/1;border-radius:8px;margin-bottom:6px;background:#fff}
.pack-info{min-width:0;width:100%}
.pack-info b{display:block;font-size:14.5px;font-weight:800;white-space:nowrap}
.pack-info .fit{display:none}
.pack-info .gift{display:block;font-size:11px;color:var(--brand);font-weight:600;margin-top:2px;line-height:1.3}
.pack-price{margin-top:6px}
.pack-price b{display:block;font-size:16px;font-weight:800;color:var(--red)}
.pack-price s{font-size:11.5px;color:#94A3B8}
.pack-price em{display:inline-block;font-style:normal;font-size:10.5px;font-weight:800;color:#fff;background:var(--brand);padding:1px 6px;border-radius:99px;margin-top:2px}
.pack.on::after{content:"✔";position:absolute;top:-8px;right:-6px;width:20px;height:20px;border-radius:50%;background:var(--brand);color:#fff;font-size:11px;display:grid;place-items:center;box-shadow:0 0 0 2px #fff}
.badge{position:absolute;top:-10px;left:50%;transform:translateX(-50%);background:var(--red);color:#fff;font-size:10px;font-weight:800;padding:2px 8px;border-radius:99px;white-space:nowrap}
.pack-fit{margin:10px 0 0;font-size:12.5px;color:var(--muted);line-height:1.45}
.pack-fit b{color:var(--ink)}
.form{margin-top:14px;padding-top:14px;border-top:1px dashed var(--line)}
.form h3{font-size:14.5px;margin-bottom:10px}
.summary{display:flex;justify-content:space-between;align-items:center;background:var(--soft);border-radius:8px;padding:10px 12px;margin:0 0 10px;font-size:14.5px;font-weight:700}
.summary b{color:var(--red);font-size:18px}
.summary.flash{animation:sumflash 1.2s ease}
@keyframes sumflash{0%,35%{background:#FFE1D9;box-shadow:0 0 0 3px rgba(238,77,45,.4)}100%{background:var(--soft);box-shadow:none}}
#order-form{scroll-margin-top:56px}
.field{margin-bottom:10px}
.field label{display:block;font-size:13px;font-weight:600;margin-bottom:4px;color:var(--muted)}
.field input{width:100%;min-height:48px;padding:10px 12px;border:1px solid #CFCFCF;border-radius:6px;font:inherit;font-size:16px;color:var(--ink);background:#fff}
.field input:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px rgba(238,77,45,.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}
.note{font-size:12.5px;color:var(--muted);line-height:1.45;margin:4px 0 10px}
.note b{color:var(--red)}
.secure{font-size:12.5px;color:var(--muted);text-align:center;margin:10px 0 0;line-height:1.5}
.secure b{color:var(--green)}
.form-err{color:var(--red);font-weight:700;text-align:center;font-size:14px;margin:10px 0 0}
.hp{position:absolute;left:-9999px;width:1px;height:1px}
.qty{display:flex;align-items:center;flex-wrap:wrap;gap:6px 10px;margin:0 0 12px}
.qty>span{font-size:13.5px;font-weight:600}
.qty-btns{display:flex;gap:6px}
.qty-btns button{min-width:56px;padding:7px 10px;border:1px solid #CFCFCF;border-radius:6px;background:#fff;color:var(--ink);font:inherit;font-size:14px;font-weight:600;cursor:pointer}
.qty-btns button.on{border-color:var(--brand);background:var(--soft);color:var(--brand)}
.qty-note{flex-basis:100%;font-size:12px;color:var(--muted)}

/* 3. Giới thiệu */
.feat{margin-bottom:18px}
.feat .m{--ar:9/16;max-width:270px;margin:0 auto 10px;border-radius:10px;background:#111}
.feat .m.wide{--ar:1/1;max-width:none}
.feat h3{margin-bottom:4px}
.feat p{font-size:14px;color:#444;line-height:1.55}
.intro .btn{margin:4px 0 20px}
.snd{position:absolute;right:8px;bottom:8px;z-index:3;border:0;border-radius:99px;background:rgba(0,0,0,.65);color:#fff;font:inherit;font-size:12.5px;font-weight:700;padding:7px 11px;cursor:pointer}
.snd.on{background:var(--brand)}
.box-list{padding:12px;border-radius:10px;background:var(--soft);border:1px solid #F8C9BC}
.box-list h3{font-size:14.5px;margin-bottom:6px}
.box-list ul{list-style:none;padding:0;margin:0;display:grid;gap:6px;font-size:13.5px}
.box-list li{display:flex;justify-content:space-between;gap:10px}
.box-list li span:last-child{color:var(--brand);font-weight:700;white-space:nowrap;text-align:right}
.total{font-weight:700;text-align:center;font-size:13.5px;margin:10px 0 0}

/* 4. Đặt hàng nhanh giữa trang */
.quick{background:var(--bg);padding:0 16px 8px}
.quick-card{background:#fff;border:1px solid var(--line);border-radius:10px;padding:12px}
.quick-head{display:flex;gap:10px;align-items:center;margin-bottom:10px}
.quick-head .m{flex:0 0 64px;--ar:1/1;border-radius:8px;background:#fff;border:1px solid var(--line)}
.quick-head b{display:block;font-size:14.5px}
.quick-head small{display:block;color:var(--muted);font-size:12px;line-height:1.35}
.quick-head span{display:block;color:var(--red);font-weight:800;font-size:16px;margin-top:2px}
.q-old{display:block;font-size:12px;color:var(--muted)}
.q-old s{color:#94A3B8}
.picks{display:flex;gap:8px;margin-bottom:10px}
.pick{flex:1;padding:10px;border:1.5px solid var(--brand);border-radius:8px;background:#fff;color:var(--brand);font:inherit;font-size:14.5px;font-weight:700;cursor:pointer}
.quick-note{font-size:12px;color:var(--muted);text-align:center;margin:8px 0 0}

/* 5. Video */
.rail{display:flex;gap:10px;overflow-x:auto;scroll-snap-type:x mandatory;margin:0 -16px;padding:4px 16px 8px;scrollbar-width:none}
.rail::-webkit-scrollbar{display:none}
.rail>*{flex:0 0 62%;scroll-snap-align:center}
.kol figure{margin:0}
.kol .m{--ar:9/16;background:#111}
.kol figcaption{margin-top:6px;font-size:13px;font-weight:600;text-align:center;line-height:1.35;color:#444}

/* 6. Shop + đánh giá */
.shop-card{display:flex;gap:10px;align-items:center;padding-bottom:10px;border-bottom:1px solid var(--line)}
.shop-av{flex:0 0 46px;height:46px;border-radius:50%;background:var(--soft);display:grid;place-items:center;font-size:22px}
.shop-info b{display:block;font-size:15px}
.shop-info small{display:block;color:var(--muted);font-size:12px;line-height:1.35}
.shop-stats{display:grid;grid-template-columns:repeat(3,1fr);text-align:center;padding:10px 0 14px;margin-bottom:6px;border-bottom:1px solid var(--line)}
.shop-stats b{display:block;font-size:16px;color:var(--brand)}
.shop-stats small{color:var(--muted);font-size:12px}
.rating-box{display:flex;gap:14px;align-items:center;padding:10px;border:1px solid var(--line);border-radius:10px;margin-bottom:10px}
.rb-score{flex:0 0 84px;text-align:center;line-height:1.1}
.rb-score b{font-size:30px;font-weight:800;color:var(--brand)}
.rb-score small{display:block;color:var(--muted);font-size:12px;margin:2px 0 4px}
.rb-score .stars{font-size:13px}
.rb-bars{flex:1;display:grid;gap:4px;font-size:12px}
.rb-bars>div{display:flex;align-items:center;gap:6px}
.rb-bars span{flex:0 0 28px;white-space:nowrap}
.rb-bars i{flex:1;height:8px;background:#EEE;border-radius:4px;overflow:hidden}
.rb-bars i b{display:block;height:100%;background:var(--gold)}
.rb-bars small{flex:0 0 18px;text-align:right;color:var(--muted)}
.stars{color:var(--gold);letter-spacing:1px;font-size:14px}
.reviews{display:grid;gap:10px}
.rv{position:relative;background:#fff;border:1px solid var(--line);border-radius:10px;padding:12px;display:flex;flex-direction:column}
.rv-h{display:flex;align-items:center;gap:10px;margin-bottom:4px;padding-right:44px}
.av{flex:0 0 34px;height:34px;border-radius:50%;background:var(--soft);color:var(--brand);font-weight:800;display:grid;place-items:center;font-size:14px}
.rv-h b{display:block;font-size:14px;line-height:1.3}
.rv-h small{color:var(--muted);font-size:12px}
.verified{color:var(--green);font-size:11.5px;font-weight:700;margin-left:6px}
.rv p{font-size:14px;margin:6px 0 8px;flex:1;color:#333}
.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}
.rv-shot{margin-top:auto;padding:7px 10px;border:1px solid var(--line);border-radius:8px;background:#FAFAFA;color:var(--brand);font:inherit;font-size:12.5px;font-weight:700;cursor:pointer;align-self:flex-start}
.rv-more{margin-top:10px}
.reviews-note{font-size:12.5px;color:var(--muted);margin:0 0 10px;line-height:1.45}
.shot-card{background:#fff;border-radius:12px;padding:10px;width:100%;max-width:780px;text-align:center}
.shot-scroll{overflow:auto;max-height:70vh;border:1px solid var(--line);border-radius:8px;-webkit-overflow-scrolling:touch}
.shot-scroll img{display:block;width:740px;max-width:none;height:auto}
.shot-hint{font-size:12.5px;color:var(--muted);margin:8px 0 0}

/* 7. Hỏi đáp */
.qa details{border-bottom:1px solid var(--line);padding:4px 0}
.qa summary{cursor:pointer;font-weight:700;font-size:14.5px;padding:8px 0;list-style:none;display:flex;justify-content:space-between;gap:8px}
.qa summary::-webkit-details-marker{display:none}
.qa summary::after{content:"+";color:var(--brand);font-weight:800;font-size:18px;line-height:1}
.qa details[open] summary::after{content:"−"}
.qa details p{font-size:14px;color:#444;line-height:1.55;padding-bottom:8px}
.qa details b{color:var(--ink)}

/* 8. Cam kết */
.guard-box{border-radius:12px;padding:16px;background:#1F2937;color:#fff}
.guard-box h2{color:#fff;font-size:17px;text-align:center}
.guard-box ol{list-style:none;padding:0;margin:12px 0 0;display:grid;gap:8px}
.guard-box li{background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.14);border-radius:10px;padding:10px 12px;font-size:14px;line-height:1.45}
.guard-box li strong{display:block;color:#FFB4A0;margin-bottom:2px}
.sign{display:flex;align-items:center;gap:12px;margin-top:14px;font-size:13px;color:#D1D5DB;line-height:1.5}
.sign .m{flex:0 0 48px;--ar:1/1;border-radius:50%}
.sign a{color:#fff;font-weight:700}

/* 9. Chốt cuối + footer */
.final{text-align:center}
.final h2{font-size:19px;margin-bottom:6px}
.final .note{font-size:13.5px;color:var(--muted);margin:0 0 14px}
footer{background:#1F2937;color:#9CA3AF;font-size:12.5px;padding:20px 16px 28px;text-align:center;line-height:1.8}
footer b{color:#fff;text-transform:uppercase}
footer a{color:#fff}

/* Nút gọi nổi + thanh dính đáy */
.call-fab{position:fixed;left:12px;bottom:calc(84px + env(safe-area-inset-bottom));z-index:55;width:50px;height:50px;border-radius:50%;background:var(--green);color:#fff;display:grid;place-items:center;font-size:22px;text-decoration:none;box-shadow:0 6px 16px rgba(38,170,153,.45)}
@media(min-width:520px){.call-fab{left:calc(50% - 240px + 12px)}}
.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 -6px 20px rgba(0,0,0,.1);padding:8px 12px calc(8px + env(safe-area-inset-bottom));display:flex;align-items:center;gap:10px}
.sticky-chat{flex:0 0 52px;text-align:center;text-decoration:none;color:var(--green);font-size:11px;font-weight:700;line-height:1.1}
.sticky-chat i{display:block;font-style:normal;font-size:20px}
.sticky-price{flex:0 0 auto;line-height:1.15}
.sticky-price small{display:block;font-size:11px;color:var(--muted)}
.sticky-price b{font-size:18px;color:var(--red)}
.sticky .btn{min-height:46px;font-size:15px}

/* Popup */
.modal{position:fixed;inset:0;z-index:100;background:rgba(0,0,0,.6);display:grid;place-items:center;padding:16px}
.modal-card{background:#fff;border-radius:14px;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}