/* MẪU V3 — "Xem thật rồi hãy quyết": nền tối kiểu TikTok, video người thật mở màn, trắc nghiệm chọn cỡ,
   form đặt hàng bật lên dạng ngăn kéo từ đáy. Dùng chung cho 2 trang v3. app.js giữ nguyên nên tên class/id không đổi. */
:root{--bg:#0B1220;--card:#131C30;--card2:#1A2540;--line:#253352;--ink:#F1F5F9;--muted:#A3B3CC;--blue:#2CB7F5;--blue-d:#0E8BC7;--cta:#FF5A2E;--cta-d:#C93F1B;--green:#3DDC84;--red:#FF6B6B;--r:16px}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:#060B15;color:var(--ink);font:16px/1.55 "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:96px;overflow-x:hidden}
section{padding:28px 16px}
h1,h2,h3{margin:0;line-height:1.22;letter-spacing:-.01em}
h1{font-size:23px;font-weight:800}
h2{font-size:21px;font-weight:800;margin-bottom:8px}
h3{font-size:16px;font-weight:700}
p{margin:0 0 12px}
.center{text-align:center}
.muted{color:var(--muted)}
.kicker{display:inline-block;font-size:12px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--blue);margin-bottom:8px}

/* Khung media + khung chờ (bản nháp) */
.m{position:relative;aspect-ratio:var(--ar,1/1);overflow:hidden;background:#0F1728;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 #64748B;border-radius:inherit;background:repeating-linear-gradient(45deg,#1E293B 0 10px,#0F172A 10px 20px);color:#CBD5E1;font-size:12px;line-height:1.35}
.ph b{font-size:13px;color:#fff;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:56px;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 6px 24px rgba(255,90,46,.4)}
.btn:active{transform:translateY(2px)}
.btn:disabled{opacity:.7;cursor:wait}
.btn-line{background:transparent;color:var(--ink);border:1.5px solid var(--line);box-shadow:none;min-height:48px;font-size:15px}
.btn-zalo{background:#0068FF;box-shadow:0 6px 20px rgba(0,104,255,.35);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. Video mở màn toàn màn hình */
.hero{position:relative;padding:0;background:#000}
.hero .m{aspect-ratio:auto;height:min(78vh,720px);border-radius:0;background:#000}
.hero .m>video,.hero .m>img,.hero .m>.ph{object-fit:contain;object-position:50% 50%}
.hero-fade{position:absolute;left:0;right:0;bottom:0;padding:70px 16px 18px;background:linear-gradient(180deg,rgba(6,11,21,0) 0,rgba(6,11,21,.85) 45%,#0B1220 100%);z-index:2}
.hero-fade h1{color:#fff;text-shadow:0 2px 8px rgba(0,0,0,.6)}
.hero-fade h1 .hl{color:var(--blue)}
.hero-fade .sub{font-size:14px;color:#DCE6F5;margin:6px 0 12px}
.hero-fade .btn{min-height:54px}
.hero-fade .btn-note{margin:8px 0 0;text-align:center;font-size:12.5px;color:var(--muted)}
.snd{position:absolute;right:12px;top:12px;z-index:3;border:0;border-radius:99px;background:rgba(0,0,0,.55);color:#fff;font:inherit;font-size:13px;font-weight:700;padding:8px 12px;cursor:pointer;backdrop-filter:blur(4px)}
.snd.on{background:var(--blue);color:#06131E}
.hero .tag-price{position:absolute;left:12px;top:12px;z-index:3;background:var(--cta);color:#fff;font-weight:800;font-size:13px;padding:6px 10px;border-radius:99px}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;padding:14px 16px 0}
.stats div{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:10px 6px;text-align:center}
.stats b{display:block;font-size:18px;font-weight:800;color:var(--blue)}
.stats i{font-style:normal}
.stats span{display:block;font-size:11.5px;color:var(--muted);line-height:1.3}

/* 2. Trắc nghiệm chọn cỡ */
.quiz{background:var(--bg)}
.quiz-box{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:16px}
.quiz-q{font-size:15.5px;font-weight:700;margin:0 0 10px}
.quiz-opts{display:grid;gap:8px}
.quiz-opts button{display:flex;align-items:center;gap:10px;width:100%;padding:12px 14px;border:1.5px solid var(--line);border-radius:12px;background:var(--card2);color:var(--ink);font:inherit;font-size:15px;font-weight:600;text-align:left;cursor:pointer}
.quiz-opts button i{font-style:normal;font-size:22px}
.quiz-opts button.on{border-color:var(--blue);box-shadow:0 0 0 3px rgba(44,183,245,.25)}
.quiz-res{margin-top:14px;padding:14px;border-radius:14px;background:linear-gradient(135deg,#0E3A5C,#0B2A44);border:1px solid #1E5C86}
.quiz-res small{display:block;font-size:12px;color:#9CD3F2;text-transform:uppercase;letter-spacing:.06em;font-weight:700}
.quiz-res b{display:block;font-size:20px;margin:4px 0 2px}
.quiz-res .why{font-size:14px;color:#DCE6F5;margin:0 0 12px}
.quiz-res .price{font-size:22px;font-weight:800;color:#fff}
.quiz-res .price s{font-size:13px;color:#9CD3F2;font-weight:500;margin-left:6px}
.quiz-res .btn{margin-top:10px;min-height:50px;font-size:15.5px}
.quiz-res .link{display:block;text-align:center;margin-top:6px}

/* 3. Gói: danh sách dọc */
.packs{display:grid;gap:10px;margin-top:12px}
.pack{position:relative;display:flex;gap:10px;align-items:center;padding:12px;border:1.5px solid var(--line);border-radius:14px;background:var(--card);cursor:pointer;transition:border-color .15s,box-shadow .15s}
.pack input{position:absolute;opacity:0;pointer-events:none}
.pack.on{border-color:var(--blue);box-shadow:0 0 0 3px rgba(44,183,245,.22);background:var(--card2)}
.radio{flex:0 0 22px;height:22px;border-radius:50%;border:2px solid #4B5F85;display:grid;place-items:center}
.pack.on .radio{border-color:var(--blue)}
.pack.on .radio::after{content:"";width:11px;height:11px;border-radius:50%;background:var(--blue)}
.pack .m{flex:0 0 52px;--ar:1/1;border-radius:10px}
.pack-info{flex:1;min-width:0}
.pack-info b{display:block;font-size:15.5px}
.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:17px;font-weight:800;color:#fff}
.pack-price s{font-size:12px;color:#7C8DA9}
.pack-price em{display:block;font-style:normal;font-size:11.5px;font-weight:700;color:var(--green)}
.badge{position:absolute;top:-10px;right:12px;background:var(--cta);color:#fff;font-size:11px;font-weight:800;padding:3px 9px;border-radius:99px}

/* 4. Trước/Sau và lưới test */
.ba{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:14px}
.ba .m{--ar:3/4}
.tag{position:absolute;top:8px;left:8px;z-index:2;padding:4px 9px;border-radius:6px;font-size:11.5px;font-weight:800;color:#fff;background:var(--red)}
.tag.ok{background:var(--green);color:#06131E}
.ba figure{margin:0}
.ba figcaption{margin-top:6px;font-size:13.5px;color:var(--muted);text-align:center;line-height:1.35}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:14px}
.grid2 figure{margin:0}
.grid2 .m{--ar:9/16}
.grid2 figcaption{margin-top:6px;font-size:13px;font-weight:600;text-align:center;line-height:1.35}
.grid2 .snd{top:auto;bottom:8px;right:8px;font-size:12px;padding:6px 10px}

/* 5. Bình luận khách */
.reviews{display:grid;gap:8px}
.rv{position:relative;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:12px}
.rv-h{display:flex;align-items:center;gap:10px;margin-bottom:4px;padding-right:50px}
.av{flex:0 0 36px;height:36px;border-radius:50%;background:linear-gradient(135deg,var(--blue),#7C3AED);color:#fff;font-weight:800;display:grid;place-items:center}
.rv-h b{display:block;font-size:14.5px;line-height:1.3}
.rv-h small{color:var(--muted);font-size:12px}
.stars{color:#FBBF24;letter-spacing:1px;font-size:13px}
.verified{color:var(--green);font-size:11.5px;font-weight:700;margin-left:6px}
.rv p{font-size:14.5px;margin:6px 0 8px}
.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{padding:7px 10px;border:1px solid var(--line);border-radius:10px;background:var(--card2);color:var(--blue);font:inherit;font-size:13px;font-weight:700;cursor:pointer}
.rv-more{margin-top:10px}
.reviews-note{font-size:13px;color:var(--muted);margin:-2px 0 10px;line-height:1.45}
.shot-card{background:#fff;color:#0F172A;border-radius:16px;padding:10px;width:100%;max-width:780px;text-align:center}
.shot-scroll{overflow:auto;max-height:70vh;border:1px solid #E2E8F0;border-radius:10px;-webkit-overflow-scrolling:touch}
.shot-scroll img{display:block;width:740px;max-width:none;height:auto}
.shot-hint{font-size:12.5px;color:#475569;margin:8px 0 0}
.shot-card .link{color:#475569}

/* 6. Cam kết + FAQ + chốt */
.guard-box{border-radius:18px;padding:16px;background:linear-gradient(135deg,#0F3D2A,#0B2A1E);border:1px solid #1F6B4A}
.guard-box h2{font-size:18px;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,.06);border-radius:12px;padding:10px 12px;font-size:14.5px;line-height:1.45}
.guard-box li strong{display:block;color:var(--green);margin-bottom:2px}
.sign{display:flex;align-items:center;gap:12px;margin-top:14px;font-size:13px;color:var(--muted);line-height:1.5}
.sign .m{flex:0 0 44px;--ar:1/1;border-radius:50%}
.sign a{color:#fff;font-weight:700}
.faq details{border:1px solid var(--line);border-radius:12px;margin-bottom:8px;background:var(--card)}
.faq summary{list-style:none;cursor:pointer;padding:12px 44px 12px 14px;font-weight:700;position:relative;font-size:15px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:12px;top:50%;transform:translateY(-50%);width:24px;height:24px;border-radius:50%;background:var(--card2);color:var(--blue);display:grid;place-items:center;font-size:17px}
.faq details[open] summary::after{content:"−"}
.faq details p{padding:0 14px 12px;margin:0;color:#DCE6F5;font-size:14.5px}
.cross{display:block;margin-top:12px;padding:12px 14px;border-radius:12px;background:var(--card);border:1px dashed var(--blue);text-decoration:none;font-size:14.5px;line-height:1.45}
.cross b{color:var(--blue)}
.final{text-align:center;padding-top:8px}
.final h2{font-size:21px}
.final .note{font-size:14px;color:var(--muted);margin:0 0 14px}
footer{background:#060B15;color:#7C8DA9;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}

/* Ngăn kéo đặt hàng (form) */
.sheet{position:fixed;inset:0;z-index:90;display:none}
body.sheet-open .sheet{display:block}
body.sheet-open{overflow:hidden}
.sheet-bg{position:absolute;inset:0;background:rgba(0,0,0,.65)}
.sheet-card{position:absolute;left:0;right:0;bottom:0;max-width:480px;margin:0 auto;background:#fff;color:#0F172A;border-radius:22px 22px 0 0;padding:10px 16px calc(16px + env(safe-area-inset-bottom));max-height:92vh;overflow:auto;animation:up .25s ease}
@keyframes up{from{transform:translateY(40px);opacity:.6}to{transform:none;opacity:1}}
.grip{width:44px;height:5px;border-radius:99px;background:#CBD5E1;margin:0 auto 10px}
.sheet-close{position:absolute;right:12px;top:12px;width:32px;height:32px;border:0;border-radius:50%;background:#F1F5F9;color:#334155;font-size:18px;cursor:pointer}
.form h3{text-align:center;font-size:16px;margin-bottom:8px;color:#0F172A}
.deadline{display:flex;align-items:center;justify-content:center;gap:6px;flex-wrap:wrap;font-size:12.5px;font-weight:700;color:#DC2626;background:#FFF1F1;border-radius:10px;padding:6px 10px;margin:0 0 10px;text-align:center;line-height:1.3}
.timer{display:inline-flex;font-variant-numeric:tabular-nums;font-size:14px;font-weight:800}
.timer b+b::before{content:":"}
.summary{display:flex;justify-content:space-between;align-items:center;background:#EFF8FF;border-radius:12px;padding:10px 12px;margin:0 0 10px;font-size:15px;font-weight:700}
.summary b{color:#DC2626;font-size:18px}
.summary.flash{animation:sumflash 1.2s ease}
@keyframes sumflash{0%,35%{background:#FFE4D6;box-shadow:0 0 0 3px rgba(255,90,46,.45)}100%{background:#EFF8FF;box-shadow:none}}
.field{margin-bottom:10px}
.field label{display:block;font-size:13.5px;font-weight:700;margin-bottom:4px;color:#0F172A}
.field input{width:100%;min-height:50px;padding:12px 14px;border:1.5px solid #CBD5E1;border-radius:12px;font:inherit;font-size:16px;color:#0F172A;background:#fff}
.field input:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 3px rgba(44,183,245,.25)}
.field .msg{display:none;color:#DC2626;font-size:13px;margin-top:4px}
.field.err input{border-color:#DC2626}
.field.err .msg{display:block}
.secure{font-size:12.5px;color:#475569;text-align:center;margin:10px 0 0;line-height:1.5}
.form-err{color:#DC2626;font-weight:600;text-align:center;font-size:14px;margin:10px 0 0}
.hp{position:absolute;left:-9999px;width:1px;height:1px}
.pick{display:flex;gap:6px;margin:0 0 10px}
.pick button{flex:1;padding:8px 4px;border:1.5px solid #CBD5E1;border-radius:10px;background:#fff;color:#0F172A;font:inherit;font-size:13px;font-weight:700;cursor:pointer}
.pick button.on{border-color:var(--cta);background:#FFF3EE;color:#C93F1B}

/* 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}
body.sheet-open .sticky{display:none}
.sticky-in{max-width:480px;margin:0 auto;background:rgba(11,18,32,.96);border-top:1px solid var(--line);backdrop-filter:blur(8px);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:#fff}
.sticky .btn{min-height:48px;font-size:15px}

/* Popup cảm ơn */
.modal{position:fixed;inset:0;z-index:100;background:rgba(0,0,0,.75);display:grid;place-items:center;padding:16px}
.modal-card{background:#fff;color:#0F172A;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}
.modal-card .link{color:#475569}
.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}