/* M7 Academy — hệ thiết kế chung cho 2 landing page (đỏ · đen · trắng) */
:root{
  --red:#E10600; --red-d:#B00500; --red-soft:#FFECEB;
  --ink:#0B0B0C; --ink-2:#17171A; --ink-3:#24242A;
  --paper:#FFFFFF; --mist:#F4F4F5; --line:#E4E4E7;
  --mute:#5B5B66; --mute-d:#A1A1AA;
  --ok:#0F8A43;
  --r:14px; --r-s:10px;
  --display:"Barlow Condensed","Be Vietnam Pro",system-ui,sans-serif;
  --body:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",sans-serif;
  --pad:20px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font:400 16px/1.6 var(--body);overflow-x:hidden}
img{max-width:100%;display:block}
a{color:inherit}
h1,h2,h3{margin:0;line-height:1.08;letter-spacing:-.01em}
h1,h2{font-family:var(--display);font-weight:800;text-transform:uppercase}
h1{font-size:clamp(34px,9.6vw,60px)}
h2{font-size:clamp(30px,8vw,52px)}
h3{font-size:19px;font-weight:700}
h1 em,h2 em{font-style:normal;color:var(--red)}
p{margin:0 0 14px}
.wrap{max-width:1080px;margin:0 auto;padding:0 var(--pad)}
.narrow{max-width:720px}
section{padding:64px 0;scroll-margin-top:60px}
.dark{background:var(--ink);color:#fff}
.dark .mute,.dark .lede{color:var(--mute-d)}
.mist{background:var(--mist)}
.kicker{display:inline-flex;align-items:center;gap:8px;font:700 13px/1 var(--body);letter-spacing:.14em;text-transform:uppercase;color:var(--red);margin-bottom:14px}
.kicker::before{content:"";width:22px;height:3px;background:var(--red);border-radius:2px}
.lede{font-size:18px;color:var(--mute);margin:16px 0 0;max-width:640px}
.mute{color:var(--mute)}
.fine{font-size:13px;color:var(--mute)}
.dark .fine{color:var(--mute-d)}
.center{text-align:center}
.center .lede{margin-left:auto;margin-right:auto}

/* ---------- Thanh trên ---------- */
.top{position:sticky;top:0;z-index:40;background:rgba(11,11,12,.94);backdrop-filter:saturate(1.4) blur(10px);-webkit-backdrop-filter:saturate(1.4) blur(10px);color:#fff;border-bottom:1px solid #222}
.top .wrap{display:flex;align-items:center;gap:12px;height:58px}
.logo{display:flex;align-items:center;gap:9px;text-decoration:none;font:800 20px/1 var(--display);letter-spacing:.04em;white-space:nowrap}
.logo b{display:grid;place-items:center;width:32px;height:32px;border-radius:8px;background:var(--red);font-size:17px}
.logo span{font-weight:600;color:var(--mute-d)}
.switch{margin-left:auto;display:flex;background:#1E1E22;border-radius:999px;padding:3px;gap:2px}
.switch a{font:600 13px/1 var(--body);padding:9px 12px;border-radius:999px;text-decoration:none;color:var(--mute-d);white-space:nowrap}
.switch a[aria-current="page"]{background:#fff;color:var(--ink)}
.switch a:not([aria-current]):hover{color:#fff}
.top .btn-s{display:none}
@media(min-width:860px){.top .btn-s{display:inline-flex}}
@media(max-width:400px){.logo span{display:none}.switch a{padding:9px 10px;font-size:12px}}

/* ---------- Nút ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:56px;padding:16px 26px;border-radius:999px;border:0;background:var(--red);color:#fff;font:700 17px/1.2 var(--body);text-decoration:none;cursor:pointer;transition:transform .15s,background .15s,box-shadow .15s;box-shadow:0 8px 24px -10px rgba(225,6,0,.7);text-align:center}
.btn:hover{background:var(--red-d);transform:translateY(-1px)}
.btn:active{transform:translateY(1px) scale(.99)}
.btn:focus-visible,.ghost:focus-visible,.switch a:focus-visible,summary:focus-visible,.chip:focus-visible{outline:3px solid #FF8A85;outline-offset:3px}
.btn[disabled]{opacity:.6;cursor:wait}
.btn.block{width:100%}
.btn .arr{transition:transform .15s}
.btn:hover .arr{transform:translateX(3px)}
.btn-s{min-height:40px;padding:10px 18px;font-size:14px;box-shadow:none}
.ghost{display:inline-flex;align-items:center;justify-content:center;min-height:52px;padding:14px 24px;border-radius:999px;border:2px solid currentColor;background:transparent;color:inherit;font:700 16px/1.2 var(--body);text-decoration:none;cursor:pointer;transition:background .15s,color .15s}
.ghost:hover{background:var(--ink);color:#fff;border-color:var(--ink)}
.dark .ghost:hover{background:#fff;color:var(--ink);border-color:#fff}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.cta-row>*{flex:1 1 220px}
.cta-center{text-align:center;margin-top:32px}

/* ---------- Hero ---------- */
.hero{padding:0;background:var(--ink);color:#fff;position:relative;overflow:hidden}
.hero-grid{display:grid;gap:0}
.hero-copy{padding:34px var(--pad) 40px;position:relative;z-index:2}
.hero-img{position:relative;aspect-ratio:16/9;overflow:hidden;order:-1}
@media(max-width:899px){.hero-copy{padding-top:6px}.hero-img::after{background:linear-gradient(180deg,rgba(11,11,12,0) 55%,var(--ink) 100%)}.hero .stripe{display:none}}
.hero-img img{width:100%;height:100%;object-fit:cover;object-position:50% 25%}
.hero-img::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(11,11,12,0) 45%,var(--ink) 100%)}
.hero-tag{position:absolute;left:var(--pad);bottom:16px;z-index:2;font-size:12px;color:#d4d4d8;background:rgba(0,0,0,.55);padding:6px 10px;border-radius:999px}
.hero .lede{color:#D4D4D8}
.stripe{display:block;width:64px;height:6px;background:var(--red);margin:0 0 18px;transform:skewX(-20deg)}
.facts{display:flex;flex-wrap:wrap;gap:8px;margin:22px 0 0;padding:0;list-style:none}
.facts li{font:600 13px/1 var(--body);padding:9px 12px;border-radius:999px;background:#1E1E22;color:#E4E4E7}
.facts li b{color:#fff}
.price-line{margin-top:20px;font-size:15px;color:var(--mute-d)}
.price-line strong{font:800 30px/1 var(--display);color:#fff;letter-spacing:.02em;margin-right:6px}
.hero .cta-row{margin-top:22px}
@media(min-width:900px){
  .hero-grid{grid-template-columns:1.05fr .95fr;min-height:620px;max-width:1280px;margin:0 auto}
  .hero-copy{padding:72px 48px 72px max(var(--pad),calc((100vw - 1280px)/2 + 40px));align-self:center}
  .hero-img{aspect-ratio:auto}
  .hero-img::after{background:linear-gradient(90deg,var(--ink) 0%,rgba(11,11,12,0) 35%)}
}

/* ---------- Thẻ & lưới ---------- */
.grid{display:grid;gap:14px;margin-top:30px}
@media(min-width:720px){.g2{grid-template-columns:1fr 1fr}.g3{grid-template-columns:repeat(3,1fr)}.g4{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1000px){.g4{grid-template-columns:repeat(4,1fr)}}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:22px}
.mist .card{border-color:transparent}
.dark .card{background:var(--ink-2);border-color:#2A2A30}
.card p{margin:8px 0 0;color:var(--mute)}
.dark .card p{color:var(--mute-d)}
.num{display:inline-grid;place-items:center;min-width:42px;height:42px;padding:0 8px;border-radius:10px;background:var(--red);color:#fff;font:800 22px/1 var(--display);margin-bottom:14px}
.card.line-top{border-top:4px solid var(--red)}

/* ---------- Ô tự nhận diện (trang 1) ---------- */
.checks{display:grid;gap:10px;margin-top:28px}
@media(min-width:720px){.checks{grid-template-columns:1fr 1fr}}
.check{position:relative;display:flex;gap:14px;align-items:flex-start;padding:16px 18px;border:2px solid var(--line);border-radius:var(--r);background:#fff;cursor:pointer;transition:border-color .15s,background .15s;font-weight:500}
.check:hover{border-color:#C4C4CC}
.check input{position:absolute;opacity:0;pointer-events:none}
.check .box{flex:none;width:24px;height:24px;border-radius:7px;border:2px solid #C4C4CC;display:grid;place-items:center;margin-top:1px;transition:all .15s}
.check .box::after{content:"";width:6px;height:11px;border:solid #fff;border-width:0 3px 3px 0;transform:rotate(45deg) translate(-1px,-1px);opacity:0}
.check input:checked~.box{background:var(--red);border-color:var(--red)}
.check input:checked~.box::after{opacity:1}
.check:has(input:checked){border-color:var(--red);background:var(--red-soft)}
.check input:focus-visible~.box{outline:3px solid #FF8A85;outline-offset:2px}
.check small{display:block;color:var(--mute);font-weight:400;font-size:14px;margin-top:2px}
.verdict{margin-top:18px;padding:20px 22px;border-radius:var(--r);background:var(--ink);color:#fff;transition:opacity .2s}
.verdict h3{font-size:20px}
.verdict p{margin:8px 0 0;color:#D4D4D8}
.verdict .ghost{margin-top:14px;min-height:46px;font-size:15px}

/* ---------- Bản đồ sửa lỗi (trang 2) ---------- */
.chips{display:flex;flex-wrap:wrap;gap:10px;margin-top:26px}
.chip{appearance:none;border:2px solid #34343B;background:var(--ink-2);color:#E4E4E7;border-radius:999px;padding:12px 16px;font:600 15px/1.25 var(--body);cursor:pointer;text-align:left;transition:all .15s}
.chip:hover{border-color:#5A5A63}
.chip[aria-pressed="true"]{background:var(--red);border-color:var(--red);color:#fff}
.chip[aria-pressed="true"]::before{content:"✓ "}
.map-out{margin-top:22px;border-radius:var(--r);background:#fff;color:var(--ink);padding:22px;min-height:120px}
.map-out .empty{color:var(--mute);margin:0}
.map-head{display:flex;flex-wrap:wrap;align-items:baseline;gap:6px 14px;margin-bottom:14px}
.map-head b{font:800 40px/1 var(--display);color:var(--red)}
.map-list{display:grid;gap:10px;margin:0;padding:0;list-style:none}
.map-list li{border:1px solid var(--line);border-radius:var(--r-s);padding:12px 14px}
.map-list li strong{display:block;font-size:15px}
.map-list li span{font-size:14px;color:var(--mute)}
.map-list .pro-tag,.lv{display:inline-block;font:700 11px/1 var(--body);letter-spacing:.06em;text-transform:uppercase;padding:4px 7px;border-radius:5px;background:var(--ink);color:#fff;margin-left:6px;vertical-align:2px}
.lv.b{background:var(--mist);color:var(--ink)}

/* ---------- Trích dẫn ---------- */
.pull{font:700 clamp(24px,6vw,38px)/1.25 var(--body);letter-spacing:-.01em;margin:0}
.pull::before{content:"“";display:block;font:800 80px/0.6 var(--display);color:var(--red);margin-bottom:14px}

/* ---------- Dòng thời gian / lộ trình ---------- */
.steps{list-style:none;margin:30px 0 0;padding:0;counter-reset:s;display:grid;gap:0}
.steps li{position:relative;padding:0 0 26px 58px;counter-increment:s}
.steps li::before{content:counter(s,decimal-leading-zero);position:absolute;left:0;top:-2px;width:42px;height:42px;border-radius:50%;background:var(--ink);color:#fff;display:grid;place-items:center;font:800 18px/1 var(--display)}
.dark .steps li::before{background:var(--red)}
.steps li::after{content:"";position:absolute;left:20px;top:44px;bottom:4px;width:2px;background:var(--line)}
.dark .steps li::after{background:#2A2A30}
.steps li:last-child::after{display:none}
.steps h3{margin-top:8px}
.steps p{margin:6px 0 0;color:var(--mute)}
.dark .steps p{color:var(--mute-d)}
.steps .tag{display:inline-block;font:700 12px/1 var(--body);letter-spacing:.08em;text-transform:uppercase;color:var(--red);margin-bottom:4px}

/* ---------- Video ---------- */
.vids{display:grid;gap:16px;margin-top:28px}
@media(min-width:720px){.vids.two{grid-template-columns:1fr 1fr}.vids.four{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1000px){.vids.four{grid-template-columns:repeat(4,1fr)}}
.vid{margin:0}
.frame{position:relative;border-radius:var(--r);overflow:hidden;background:#000;aspect-ratio:16/9}
.vids.four .frame{aspect-ratio:3/4}
.frame video{width:100%;height:100%;object-fit:cover;display:block;background:#000}
.vid.playing video{object-fit:contain}
.play{position:absolute;inset:0;border:0;background:linear-gradient(180deg,rgba(0,0,0,0) 40%,rgba(0,0,0,.65));cursor:pointer;display:grid;place-items:center;padding:0}
.play i{width:68px;height:68px;border-radius:50%;background:var(--red);display:grid;place-items:center;box-shadow:0 10px 30px -8px rgba(225,6,0,.8);transition:transform .15s}
.play i::after{content:"";border-style:solid;border-width:12px 0 12px 19px;border-color:transparent transparent transparent #fff;margin-left:5px}
.play:hover i{transform:scale(1.08)}
.play:focus-visible i{outline:3px solid #fff;outline-offset:3px}
.play .len{position:absolute;right:10px;bottom:10px;font:600 12px/1 var(--body);color:#fff;background:rgba(0,0,0,.7);padding:5px 8px;border-radius:6px}
.vid.playing .play{display:none}
.vid figcaption{margin-top:10px;font-size:14px;color:var(--mute)}
.dark .vid figcaption{color:var(--mute-d)}
.vid figcaption b{display:block;color:var(--ink);font-size:16px}
.dark .vid figcaption b{color:#fff}
.badge{display:inline-block;font:700 11px/1 var(--body);letter-spacing:.08em;text-transform:uppercase;padding:5px 8px;border-radius:5px;background:var(--red-soft);color:var(--red-d);margin-bottom:6px}
.dark .badge{background:#3A0A08;color:#FF8A85}

/* ---------- Coach ---------- */
.coach{display:grid;gap:26px;align-items:center}
@media(min-width:860px){.coach{grid-template-columns:.85fr 1.15fr;gap:48px}}
.coach-pics{display:grid;grid-template-columns:1.25fr 1fr;gap:10px}
.coach-pics img{border-radius:var(--r);width:100%;height:100%;object-fit:cover;aspect-ratio:4/5}
.coach-pics img+img{aspect-ratio:auto;align-self:end;height:78%}
.coach ul{margin:18px 0 0;padding:0;list-style:none;display:grid;gap:10px}
.coach li{padding-left:28px;position:relative}
.coach li::before{content:"";position:absolute;left:0;top:9px;width:14px;height:4px;background:var(--red);transform:skewX(-20deg)}
.sign{margin-top:18px;font-weight:700}
.sign small{display:block;font-weight:400;color:var(--mute)}
.dark .sign small{color:var(--mute-d)}

/* ---------- Gói học ---------- */
.plans{display:grid;gap:16px;margin-top:30px;align-items:stretch}
@media(min-width:820px){.plans{grid-template-columns:1fr 1fr}}
.plan{position:relative;display:flex;flex-direction:column;border-radius:20px;padding:26px 22px;background:#fff;border:2px solid var(--line)}
.plan.hot{background:var(--ink);color:#fff;border-color:var(--red);box-shadow:0 24px 50px -24px rgba(225,6,0,.55)}
.plan .flag{position:absolute;top:-13px;left:22px;background:var(--red);color:#fff;font:700 12px/1 var(--body);letter-spacing:.06em;text-transform:uppercase;padding:7px 11px;border-radius:999px}
.plan h3{font:800 28px/1 var(--display);text-transform:uppercase;letter-spacing:.02em}
.plan .for{margin:6px 0 0;font-size:14px;color:var(--mute)}
.plan.hot .for{color:var(--mute-d)}
.plan .price{margin:20px 0 4px;font:800 54px/1 var(--display);letter-spacing:.01em}
.plan .price small{font:600 15px/1 var(--body);color:var(--mute);margin-left:4px;letter-spacing:0}
.plan.hot .price small{color:var(--mute-d)}
.plan .once{font-size:13px;color:var(--mute);margin:0 0 18px}
.plan.hot .once{color:var(--mute-d)}
.plan ul{list-style:none;margin:0 0 22px;padding:0;display:grid;gap:10px;flex:1}
.plan li{position:relative;padding-left:30px;font-size:15px}
.plan li::before{content:"";position:absolute;left:0;top:2px;width:20px;height:20px;border-radius:50%;background:var(--ink) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath d='M5.5 10.5l3 3 6-7' fill='none' stroke='%23fff' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/16px no-repeat}
.plan.hot li::before{background-color:var(--red)}
.plan li.no{color:var(--mute)}
.plan li.no::before{background:var(--mist) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath d='M7 7l6 6M13 7l-6 6' fill='none' stroke='%2371717A' stroke-width='2.2' stroke-linecap='round'/%3E%3C/svg%3E") center/16px no-repeat}
.plan .btn,.plan .ghost{width:100%}
.plan .upgrade{margin:12px 0 0;font-size:14px;color:var(--mute);text-align:center}
.plan.hot .upgrade{color:var(--mute-d)}
.coach-say{margin:30px 0 0;padding:20px 22px;border-left:4px solid var(--red);background:#fff;border-radius:0 var(--r) var(--r) 0}
.dark .coach-say{background:var(--ink-2)}
.coach-say blockquote{margin:0;font-size:17px;font-weight:500}
.coach-say figcaption{margin-top:10px;font-size:14px;color:var(--mute);display:flex;align-items:center;gap:10px}
.dark .coach-say figcaption{color:var(--mute-d)}
.coach-say figcaption img{width:34px;height:34px;border-radius:50%;object-fit:cover;object-position:50% 20%}
.assure{display:flex;gap:14px;align-items:flex-start;margin-top:18px;padding:16px 18px;border-radius:var(--r);background:#fff;border:1px dashed #C4C4CC;font-size:15px}
.dark .assure{background:transparent;border-color:#3A3A42}
.assure b{color:var(--red)}

/* ---------- Quyền lợi trọn đời ---------- */
.perks{display:grid;gap:12px;margin-top:30px}
@media(min-width:720px){.perks{grid-template-columns:1fr 1fr}}
.perk{display:flex;gap:16px;align-items:flex-start;padding:20px;border-radius:var(--r);background:var(--ink-2);border:1px solid #2A2A30}
.perk .ico{flex:none;width:46px;height:46px;border-radius:12px;background:var(--red);display:grid;place-items:center}
.perk .ico svg{width:24px;height:24px;stroke:#fff;fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.perk h3{color:#fff}
.perk p{margin:6px 0 0;color:var(--mute-d);font-size:15px}

/* ---------- Thống kê giáo trình ---------- */
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:26px}
.stat{padding:16px 10px;border-radius:var(--r);background:#fff;text-align:center;border:1px solid var(--line)}
.dark .stat{background:var(--ink-2);border-color:#2A2A30}
.stat b{display:block;font:800 clamp(32px,9vw,48px)/1 var(--display);color:var(--red)}
.stat span{font-size:13px;color:var(--mute)}
.dark .stat span{color:var(--mute-d)}

/* ---------- Giáo trình (accordion) ---------- */
.curr{margin-top:26px;display:grid;gap:10px}
.part-h{display:flex;flex-wrap:wrap;justify-content:space-between;gap:4px 12px;align-items:baseline;margin:22px 0 4px;padding-bottom:8px;border-bottom:2px solid var(--ink)}
.part-h:first-child{margin-top:0}
.part-h b{font:800 22px/1.1 var(--display);text-transform:uppercase}
.part-h span{font-size:13px;color:var(--mute)}
details.ch{border:1px solid var(--line);border-radius:var(--r-s);background:#fff;overflow:hidden}
details.ch summary{list-style:none;display:flex;align-items:center;gap:12px;padding:14px 14px;cursor:pointer}
details.ch summary::-webkit-details-marker{display:none}
details.ch summary::after{content:"";margin-left:auto;flex:none;width:10px;height:10px;border:solid var(--ink);border-width:0 2px 2px 0;transform:rotate(45deg);transition:transform .2s}
details.ch[open] summary::after{transform:rotate(-135deg)}
.ch-no{flex:none;width:34px;height:34px;border-radius:8px;display:grid;place-items:center;font:800 17px/1 var(--display);background:var(--red-soft);color:var(--red-d)}
.ch.pro .ch-no{background:var(--ink);color:#fff}
.ch-t{font-weight:600;line-height:1.3}
.ch-t small{display:block;font-weight:400;color:var(--mute);font-size:13px;margin-top:2px}
details.ch ol{margin:0;padding:4px 14px 14px 60px;display:grid;gap:6px;font-size:15px}
details.ch ol li span{color:var(--mute);font-size:13px;margin-left:6px;white-space:nowrap}

/* ---------- FAQ ---------- */
.faq{margin-top:26px;display:grid;gap:10px}
.faq details{border-radius:var(--r-s);background:#fff;border:1px solid var(--line)}
.dark .faq details{background:var(--ink-2);border-color:#2A2A30}
.faq summary{list-style:none;cursor:pointer;padding:18px 48px 18px 18px;font-weight:600;position:relative}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:18px;top:50%;transform:translateY(-50%);font:400 26px/1 var(--body);color:var(--red)}
.faq details[open] summary::after{content:"–"}
.faq details p{padding:0 18px 18px;margin:0;color:var(--mute)}
.dark .faq details p{color:var(--mute-d)}

/* ---------- Ô chờ tư liệu thật ---------- */
.slot{border:2px dashed #C4C4CC;border-radius:var(--r);padding:22px;background:repeating-linear-gradient(-45deg,#fff 0 12px,#FAFAFA 12px 24px);color:var(--mute);font-size:15px}
.dark .slot{border-color:#3A3A42;background:repeating-linear-gradient(-45deg,#111114 0 12px,#141418 12px 24px);color:var(--mute-d)}
.slot b{display:block;color:var(--ink);margin-bottom:4px}
.dark .slot b{color:#fff}

/* ---------- Form & thanh toán ---------- */
.order{display:grid;gap:24px;margin-top:30px}
@media(min-width:900px){.order{grid-template-columns:1fr 1fr;align-items:start}}
.form{background:#fff;color:var(--ink);border-radius:20px;padding:24px 20px}
.form h3{font-size:22px;margin-bottom:4px}
.pick{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:18px 0 6px}
.pick label{position:relative;cursor:pointer}
.pick input{position:absolute;opacity:0}
.pick span{display:block;padding:14px 12px;border:2px solid var(--line);border-radius:12px;font-weight:700;transition:all .15s}
.pick span i{display:block;font:800 24px/1.1 var(--display);font-style:normal;margin-top:4px}
.pick input:checked+span{border-color:var(--red);background:var(--red-soft)}
.pick input:checked+span i{color:var(--red)}
.pick input:focus-visible+span{outline:3px solid #FF8A85;outline-offset:2px}
.field{margin-top:14px}
.field label{display:block;font-weight:600;font-size:15px;margin-bottom:6px}
.field input{width:100%;min-height:52px;padding:12px 14px;border:2px solid var(--line);border-radius:12px;font:500 17px/1.2 var(--body);color:var(--ink);background:#fff;transition:border-color .15s}
.field input:focus{outline:none;border-color:var(--ink)}
.field input:user-invalid{border-color:var(--red)}
.form .btn{margin-top:20px;width:100%}
.form-msg{display:none;margin-top:12px;padding:12px 14px;border-radius:10px;background:var(--red-soft);color:var(--red-d);font-size:15px}
.form .fine{margin:12px 0 0;text-align:center}
.side{display:grid;gap:12px}
.side .card{padding:18px 20px}
.side h3{font-size:17px}
.pay{background:#fff;color:var(--ink);border-radius:20px;padding:24px 20px}
.pay h3{font-size:22px}
.qr{display:grid;place-items:center;margin:16px auto;width:min(280px,100%);aspect-ratio:1;border-radius:14px;border:1px solid var(--line);background:#fff;overflow:hidden}
.qr img{width:100%;height:auto;image-rendering:pixelated}
.pay-rows{display:grid;gap:8px;margin:0;font-size:15px}
.pay-rows div{display:flex;justify-content:space-between;gap:12px;align-items:center;padding:10px 12px;border-radius:10px;background:var(--mist)}
.pay-rows dt{color:var(--mute)}
.pay-rows dd{margin:0;font-weight:700;text-align:right;word-break:break-all}
.copy{margin-left:8px;border:0;background:var(--ink);color:#fff;font:600 12px/1 var(--body);padding:7px 9px;border-radius:7px;cursor:pointer;white-space:nowrap}
.copy:hover{background:var(--red)}
.demo{margin:0 0 14px;padding:12px 14px;border-radius:10px;background:#FFF7E0;color:#7A5300;font-size:14px;border:1px solid #F3D27A}
.paid{background:#fff;color:var(--ink);border-radius:20px;padding:28px 22px;text-align:center}
.paid .big{font-size:52px;line-height:1}
.links-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px}
.links-row a{font-size:14px}

/* ---------- Chân trang ---------- */
footer{background:#000;color:var(--mute-d);padding:40px 0 120px;font-size:14px}
footer .logo{color:#fff;margin-bottom:14px}
footer a{color:#fff}
footer nav{display:flex;flex-wrap:wrap;gap:8px 18px;margin:14px 0}
@media(min-width:860px){footer{padding-bottom:40px}}

/* ---------- Nút dính đáy (điện thoại) ---------- */
.sticky{position:fixed;left:0;right:0;bottom:0;z-index:50;padding:10px 14px calc(10px + env(safe-area-inset-bottom));background:rgba(11,11,12,.96);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);display:flex;align-items:center;gap:12px;border-top:1px solid #222;transform:translateY(110%);transition:transform .25s}
.sticky.on{transform:none}
.sticky .p{color:#fff;font-size:12px;line-height:1.25}
.sticky .p b{display:block;font:800 22px/1 var(--display);letter-spacing:.02em}
.sticky .btn{flex:1;min-height:50px;font-size:16px}
@media(min-width:860px){.sticky{display:none}}

/* ---------- Trang chọn lối ---------- */
.door{display:grid;gap:16px;margin-top:30px}
@media(min-width:820px){.door{grid-template-columns:1fr 1fr}}
.door a{position:relative;display:flex;flex-direction:column;justify-content:flex-end;min-height:420px;border-radius:22px;overflow:hidden;text-decoration:none;color:#fff;padding:26px 22px;isolation:isolate;transition:transform .2s}
.door a:hover{transform:translateY(-3px)}
.door a:focus-visible{outline:4px solid var(--red);outline-offset:4px}
.door img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:-2;object-position:50% 25%}
.door a::before{content:"";position:absolute;inset:0;z-index:-1;background:linear-gradient(180deg,rgba(0,0,0,.05) 25%,rgba(0,0,0,.92) 78%)}
.door .lvl{align-self:flex-start;font:700 12px/1 var(--body);letter-spacing:.1em;text-transform:uppercase;background:var(--red);padding:7px 10px;border-radius:999px;margin-bottom:12px}
.door h2{font-size:clamp(30px,8vw,44px)}
.door p{margin:10px 0 16px;color:#E4E4E7}
.door .go{font-weight:700;display:inline-flex;gap:8px;align-items:center}

/* Hiệu ứng xuất hiện nhẹ, tôn trọng người tắt chuyển động */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .5s ease,transform .5s ease}
.reveal.in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.reveal{opacity:1;transform:none;transition:none}.btn,.door a{transition:none}}

/* ---------- Thanh chọn trình độ (màn đầu mỗi trang) ---------- */
.levels{background:var(--ink);color:#fff;padding:12px 0 14px;border-bottom:1px solid #222}
.levels p{margin:0 0 10px;font:700 15px/1.3 var(--body);text-align:center}
.levels p span{display:block;font-weight:400;font-size:13px;color:var(--mute-d)}
.lv-row{display:grid;grid-template-columns:1fr 1fr;gap:8px;max-width:640px;margin:0 auto}
.lv-tab{position:relative;display:flex;flex-direction:column;justify-content:center;min-height:68px;padding:10px 12px 10px 38px;border-radius:14px;text-decoration:none;color:#fff;background:var(--ink-3);border:2px solid #3A3A42;transition:border-color .15s,background .15s,transform .15s}
.lv-tab b{font-size:15px;line-height:1.25}
.lv-tab small{font-size:12px;color:var(--mute-d);margin-top:3px}
.lv-tab i{position:absolute;left:11px;top:50%;transform:translateY(-50%);width:20px;height:20px;border-radius:50%;display:grid;place-items:center;font:700 12px/1 var(--body);font-style:normal;background:#3A3A42}
.lv-tab.on{background:#fff;color:var(--ink);border-color:#fff}
.lv-tab.on small{color:var(--mute)}
.lv-tab.on i{background:var(--red);color:#fff}
.lv-tab:not(.on){border-color:var(--red);animation:lv-pulse 2.4s ease-in-out 1s 3}
.lv-tab:not(.on) i{background:var(--red);color:#fff}
.lv-tab:not(.on):hover{background:#2E1010;transform:translateY(-1px)}
.lv-tab:focus-visible{outline:3px solid #FF8A85;outline-offset:2px}
@keyframes lv-pulse{0%,100%{box-shadow:0 0 0 0 rgba(225,6,0,0)}50%{box-shadow:0 0 0 6px rgba(225,6,0,.28)}}
@media(prefers-reduced-motion:reduce){.lv-tab{animation:none!important}}
/* Có thanh to rồi thì công tắc nhỏ trên góc chỉ để trên máy tính */
@media(max-width:859px){.top .switch{display:none}}

/* ---------- Trang chọn lối: vừa 1 màn điện thoại ---------- */
@media(max-width:819px){
  .home-hero{padding:22px 0 28px!important}
  .home-hero h1{font-size:32px}
  .home-hero .lede{font-size:16px;margin-top:8px}
  .door{margin-top:18px;gap:12px}
  .door a{min-height:230px;padding:18px 16px}
  .door h2{font-size:28px}
  .door p{font-size:14px;margin:6px 0 10px;line-height:1.45}
  .door .lvl{margin-bottom:8px}
  .door a::before{background:linear-gradient(180deg,rgba(0,0,0,.25) 0%,rgba(0,0,0,.88) 55%,rgba(0,0,0,.95) 100%)}
}
.door .go{align-self:flex-start;background:var(--red);padding:10px 16px;border-radius:999px;font-size:15px}