/* Landing page Business G15 — CSS thuần, bóc từ template MKT đã duyệt brand guideline.
   Nguồn: template_designs/business-landingpage/index.html. Giữ nguyên 100% màu/đổ bóng/animation/responsive. */

:root{--ink:#101820;--ink2:#3A424B;--mute:#5E6066;--line:#E6E7EA;--line2:#D5D7DB;--soft:#F5F6F7;--red:#EA0029;--red-d:#C10022;--red-bg:#FDECEF;--green:#12A150;--wrap:1200px}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:'Inter',system-ui,-apple-system,'Segoe UI',sans-serif;color:var(--ink);background:#fff;-webkit-font-smoothing:antialiased}
a{color:var(--ink)}a:hover{color:var(--red)}
img,svg{max-width:100%}
input::placeholder{color:#8A8C91}
button:focus-visible,a:focus-visible{outline:2px solid var(--red);outline-offset:2px}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 40px}
.sec{padding:112px 0}
.sec.soft{background:var(--soft)}
.h2{margin:0;font-size:44px;line-height:1.12;font-weight:300;letter-spacing:-.02em}
.lead{margin:0;font-size:18px;line-height:1.6;color:var(--ink2)}
.btn{display:inline-flex;align-items:center;justify-content:center;border:0;border-radius:10px;background:var(--red);color:#fff;font:600 16px 'Inter',sans-serif;text-decoration:none;cursor:pointer;transition:background .15s,transform .15s}
.btn:hover{background:var(--red-d);color:#fff}
.btn:active{transform:translateY(1px)}

/* NAV */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);backdrop-filter:saturate(1.4) blur(8px);border-bottom:1px solid var(--line)}
.nav .wrap{height:72px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{display:flex;align-items:center;gap:14px;text-decoration:none}
.logo{font-size:24px;font-weight:700;letter-spacing:-.03em;color:var(--ink);line-height:1}
.logo i{display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--red);margin-left:2px;font-style:normal}
.brand small{font-size:14px;color:var(--mute);border-left:1px solid var(--line);padding-left:14px}
.nav nav{display:flex;align-items:center;gap:32px;font-size:15px}
.nav nav a,.nav .login{text-decoration:none;color:var(--ink2)}
.nav nav a:hover,.nav .login:hover{color:var(--red)}
.nav-r{display:flex;align-items:center;gap:20px}
.nav .btn{height:44px;padding:0 20px;font-size:15px;border-radius:8px}

/* HERO */
.hero{padding:72px 0 96px}
.hero .wrap{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.05fr);gap:64px;align-items:start}
.hero-l{display:flex;flex-direction:column;gap:22px}
.pill{align-self:flex-start;display:inline-flex;align-items:center;gap:8px;background:var(--red-bg);color:var(--red-d);font-size:14px;font-weight:500;padding:7px 14px;border-radius:999px}
.pill::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--red)}
.hero h1{margin:0;font-size:56px;line-height:1.08;font-weight:300;letter-spacing:-.025em;max-width:16ch}
.hero .sub{margin:0;font-size:19px;line-height:1.6;color:var(--ink2);max-width:52ch}
.form{margin-top:6px;background:#fff;border:1px solid var(--line);border-radius:16px;padding:26px;box-shadow:0 24px 48px -32px rgba(16,24,32,.35);display:flex;flex-direction:column;gap:14px}
.fgrid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.form label{display:flex;flex-direction:column;gap:6px;font-size:13px;font-weight:500;color:var(--ink2)}
.form input[type=text],.form input[type=email],.form input[type=tel]{font:400 15px 'Inter',sans-serif;color:var(--ink);height:46px;padding:0 14px;border:1px solid var(--line2);border-radius:8px;background:#fff;width:100%;transition:border-color .15s,box-shadow .15s}
.form input:focus{outline:none;border-color:var(--ink);box-shadow:0 0 0 3px rgba(16,24,32,.08)}
.form input.err{border-color:var(--red);box-shadow:0 0 0 3px rgba(234,0,41,.1)}
.form .btn{height:54px;font-size:16px}
.form .btn[disabled]{opacity:.7;cursor:wait}
.checks{display:flex;flex-wrap:wrap;gap:8px 20px;font-size:13px;color:var(--ink2)}
.checks span{display:inline-flex;align-items:center;gap:6px}
.ferr{display:none;font-size:13px;color:var(--red-d)}
.done{display:none;margin-top:6px;background:var(--ink);color:#fff;border-radius:16px;padding:28px;flex-direction:column;gap:18px}
.done.show{display:flex}
.done-h{display:flex;align-items:center;gap:12px;font-size:18px;font-weight:600}
.done-h span{width:32px;height:32px;border-radius:50%;background:var(--green);display:flex;align-items:center;justify-content:center;flex-shrink:0}
.done p{margin:0;font-size:14px;line-height:1.6;color:rgba(255,255,255,.72)}
.done p b{color:#fff;font-weight:600}
.steps3{display:flex;flex-direction:column;gap:10px;font-size:15px}
.steps3 div{display:flex;align-items:center;gap:12px;padding:12px 14px;border:1px solid rgba(255,255,255,.16);border-radius:10px}
.steps3 em{font-style:normal;font-weight:300;font-size:20px;color:#FF6B80;width:18px}
.done-a{display:flex;gap:12px;flex-wrap:wrap}
.done-a button{height:46px;padding:0 16px;border-radius:8px;border:1px solid rgba(255,255,255,.24);background:transparent;color:#fff;font:500 14px 'Inter',sans-serif;cursor:pointer}
.have{font-size:14px;color:var(--mute)}

/* Mock LMS */
.mock-wrap{position:relative;padding:36px 0 0 36px}
.mock-bg{position:absolute;left:0;top:0;right:-40px;bottom:40px;background:var(--soft);border-radius:28px}
.mock{position:relative;background:#fff;border:1px solid var(--line);border-radius:16px;overflow:hidden;box-shadow:0 40px 80px -40px rgba(16,24,32,.4)}
.bar{display:flex;align-items:center;gap:12px;padding:12px 16px;background:var(--soft);border-bottom:1px solid var(--line)}
.dots{display:flex;gap:6px}.dots i{width:10px;height:10px;border-radius:50%;background:var(--line2);display:block}
.url{flex-grow:1;background:#fff;border:1px solid var(--line);border-radius:6px;font-size:13px;padding:6px 10px;color:var(--ink2);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.url b{color:var(--ink);font-weight:600}
.mock-body{display:grid;grid-template-columns:168px minmax(0,1fr);min-height:420px}
.side{border-right:1px solid var(--line);padding:18px 12px;display:flex;flex-direction:column;gap:18px;font-size:13px}
.org{display:flex;align-items:center;gap:10px}
.org span{width:32px;height:32px;flex-shrink:0;border-radius:8px;background:var(--ink);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:600}
.org b{font-size:12px;line-height:1.3;font-weight:600;word-break:break-word}
.menu{display:flex;flex-direction:column;gap:2px;color:var(--ink2)}
.menu span{padding:8px 10px;border-radius:6px}
.menu .on{background:var(--red-bg);color:var(--red-d);font-weight:500}
.main{padding:20px 22px;display:flex;flex-direction:column;gap:16px;min-width:0}
.main .k{font-size:13px;color:var(--mute)}
.main .t{font-size:20px;font-weight:600;letter-spacing:-.01em;word-break:break-word}
.path{border:1px solid var(--line);border-radius:12px;padding:14px 16px}
.path-h{display:flex;justify-content:space-between;gap:8px;font-size:13px;margin-bottom:8px}
.path-h b{font-weight:600}.path-h span{color:var(--mute);white-space:nowrap}
.pi{display:flex;align-items:center;gap:10px;font-size:13px;padding:8px 0}
.pi+.pi{border-top:1px dashed var(--line)}
.pi small{margin-left:auto;font-size:11px;color:var(--mute);white-space:nowrap}
.ok{width:18px;height:18px;border-radius:50%;background:var(--green);display:flex;align-items:center;justify-content:center;flex-shrink:0}
.todo{width:18px;height:18px;border-radius:50%;border:1.5px solid #C9CBD0;flex-shrink:0}
.prog{font-size:13px;display:flex;flex-direction:column;gap:8px}
.prog b{font-weight:600}
.pr{display:grid;grid-template-columns:90px minmax(0,1fr) 40px;align-items:center;gap:10px}
.pr .tr{height:6px;border-radius:3px;background:#F0F1F3}
.pr .tr i{display:block;height:6px;border-radius:3px;background:var(--ink)}
.pr .v{text-align:right;color:var(--mute)}
.toast{position:absolute;left:-8px;bottom:8px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:12px 16px;display:flex;align-items:center;gap:12px;box-shadow:0 20px 40px -24px rgba(16,24,32,.45);animation:floaty 5s ease-in-out infinite}
.toast>span{width:36px;height:36px;border-radius:50%;background:#E8F6EE;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.toast div{font-size:13px;line-height:1.4}.toast b{font-weight:600}.toast em{font-style:normal;color:var(--mute)}
@keyframes floaty{0%,100%{transform:translateY(0)}50%{transform:translateY(-6px)}}
.mock-note{position:relative;margin-top:72px;font-size:13px;color:var(--mute);text-align:center}

/* PROOF */
.proof{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:36px 0}
.proof .wrap{display:flex;align-items:center;justify-content:space-between;gap:48px}
.proof-t{margin:0;font-size:15px;line-height:1.6;color:var(--ink2);max-width:38ch;flex-shrink:0}
.proof-t b{color:var(--ink);font-weight:600}
.logos{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px 16px;flex-grow:1;max-width:720px}
.lg{height:56px;border:1px solid var(--line);border-radius:8px;display:flex;align-items:center;justify-content:center;padding:8px 12px;background:#fff}
.lg img{max-width:100%;max-height:36px;width:auto;height:auto;object-fit:contain}
.lg.sq img{max-height:46px}

/* PAIN */
.pain-grid{margin-top:56px;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));border-top:1px solid var(--ink)}
.pain{padding:32px 32px 0;display:flex;flex-direction:column;gap:12px;border-left:1px solid var(--line)}
.pain:first-child{padding-left:0;border-left:0}.pain:last-child{padding-right:0}
.q{font-size:44px;font-weight:300;color:var(--red);line-height:1}
.pain h3{margin:0;font-size:21px;line-height:1.3;font-weight:600;letter-spacing:-.01em}
.pain p{margin:0;font-size:16px;line-height:1.6;color:var(--ink2)}
.pain p.fix{margin-top:8px;padding-top:16px;border-top:1px dashed var(--line2);color:var(--ink)}
.pain p.fix b{color:var(--red-d);font-weight:600}

/* RECEIPT */
.pack .wrap{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,460px);gap:80px;align-items:center}
.pack-l{display:flex;flex-direction:column;gap:22px}
.note{margin:0;font-size:15px;line-height:1.6;color:var(--ink2);max-width:44ch;padding:16px 18px;background:#fff;border-radius:10px}
.receipt{background:#fff;border-radius:8px;padding:30px 30px 34px;box-shadow:0 30px 60px -40px rgba(16,24,32,.5);display:flex;flex-direction:column}
.rc-h{display:flex;justify-content:space-between;gap:12px;font-size:13px;color:var(--mute);padding-bottom:16px;border-bottom:1px dashed #C9CBD0}
.rc-h b{color:var(--ink);font-weight:600;font-size:14px}
.rc{display:flex;justify-content:space-between;gap:16px;padding:12px 0;border-bottom:1px dashed var(--line);font-size:15px}
.rc>span:last-child{color:var(--mute);white-space:nowrap}
.rc b{font-weight:600}
.rc-t{display:flex;justify-content:space-between;align-items:flex-end;padding-top:20px}
.rc-t>span{font-size:15px;font-weight:500}
.rc-t .big{font-size:48px;font-weight:300;letter-spacing:-.03em;color:var(--red);line-height:1;text-align:right}
.rc-t small{display:block;font-size:13px;color:var(--mute);margin-top:4px;text-align:right}

/* COURSES */
.c-head{display:flex;justify-content:space-between;align-items:flex-end;gap:40px}
.c-head>div:first-child{display:flex;flex-direction:column;gap:18px}
.ten{display:flex;align-items:flex-end;gap:12px;flex-shrink:0}
.ten b{font-size:104px;font-weight:300;line-height:.82;letter-spacing:-.05em;color:var(--red)}
.ten span{font-size:15px;line-height:1.4;color:var(--ink2)}
.grp{margin-top:28px;padding-top:28px;border-top:1px solid var(--line);display:grid;grid-template-columns:200px minmax(0,1fr);gap:32px}
.grp.first{margin-top:56px;border-top-color:var(--ink)}
.grp-n{display:flex;gap:10px}
.grp-n i{width:10px;height:10px;border-radius:3px;margin-top:6px;flex-shrink:0}
.grp-n b{display:block;font-size:17px;font-weight:600}.grp-n small{font-size:13px;color:var(--mute)}
.cards{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
.card{text-decoration:none;color:var(--ink);border:1px solid var(--line);border-radius:12px;overflow:hidden;display:flex;flex-direction:column;background:#fff;transition:transform .2s,box-shadow .2s}
.card:hover{transform:translateY(-3px);box-shadow:0 18px 36px -24px rgba(16,24,32,.4);color:var(--ink)}
.thumb{aspect-ratio:16/9;display:flex;align-items:flex-end;justify-content:space-between;padding:12px;position:relative;overflow:hidden}
.thumb .ic{position:absolute;right:14px;top:10px;font-size:40px;font-weight:700;letter-spacing:-.04em;opacity:.18;line-height:1}
.thumb .tag{font-size:11px;font-weight:600;letter-spacing:.02em;text-transform:uppercase}
.thumb .free{font-size:11px;font-weight:600;color:#fff;background:var(--green);padding:3px 8px;border-radius:999px}
.t-blue{background:#EDF0FF;color:#3A4DB8}.t-vio{background:#EFEEFA;color:#4C43BF}.t-org{background:#FFF0E8;color:#B33600}
.card-b{padding:16px;display:flex;flex-direction:column;gap:6px}
.card-b b{font-size:16px;font-weight:600}
.card-b span{font-size:14px;line-height:1.5;color:var(--ink2)}
.c-foot{margin-top:44px;padding-top:32px;border-top:1px solid var(--line);display:flex;align-items:center;gap:24px}
.c-foot .btn{height:52px;padding:0 24px;flex-shrink:0}
.c-foot p{margin:0;font-size:15px;line-height:1.6;color:var(--ink2);max-width:56ch}

/* DEMO TABS */
.demo .wrap{display:flex;flex-direction:column;gap:40px}
.tabs{display:flex;gap:8px;flex-wrap:wrap}
.tab{height:44px;padding:0 18px;border-radius:999px;border:1px solid var(--line2);background:#fff;color:var(--ink);font:500 15px 'Inter',sans-serif;cursor:pointer;white-space:nowrap;flex-shrink:0}
.tab.on{border-color:var(--ink);background:var(--ink);color:#fff}
.demo-g{display:grid;grid-template-columns:minmax(0,340px) minmax(0,1fr);gap:48px;align-items:center}
.pane{display:none;flex-direction:column;gap:14px}
.pane.on{display:flex}
.pane h3{margin:0;font-size:24px;font-weight:600;letter-spacing:-.01em}
.pane p{margin:0;font-size:16px;line-height:1.65;color:var(--ink2)}
.link-cta{margin-top:8px;font-size:15px;font-weight:600;color:var(--red-d);text-decoration:none}
.shot{aspect-ratio:16/10;border-radius:16px;background:#fff;border:1px solid var(--line);box-shadow:0 40px 80px -48px rgba(16,24,32,.35);overflow:hidden;display:flex;flex-direction:column}
.screen{display:none;flex:1;padding:22px;gap:14px;flex-direction:column;min-height:0}
.screen.on{display:flex}
.sc-h{display:flex;justify-content:space-between;align-items:center;gap:12px}
.sc-h b{font-size:17px;font-weight:600}.sc-h span{font-size:12px;color:var(--mute)}
.chip{font-size:11px;padding:3px 8px;border-radius:999px;background:var(--soft);color:var(--ink2);white-space:nowrap}
.row{display:flex;align-items:center;gap:12px;padding:11px 14px;border:1px solid var(--line);border-radius:10px;font-size:14px}
.row .n{width:24px;height:24px;border-radius:50%;background:var(--soft);display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:600;flex-shrink:0}
.row .n.g{background:var(--green);color:#fff}
.row .chip{margin-left:auto}
.files{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
.file{border:1px solid var(--line);border-radius:10px;padding:14px;display:flex;flex-direction:column;gap:10px;font-size:13px}
.file .ft{width:34px;height:40px;border-radius:6px;display:flex;align-items:flex-end;justify-content:center;padding-bottom:5px;font-size:9px;font-weight:700;color:#fff}
.file small{color:var(--mute)}
.kpis{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
.kpi{border:1px solid var(--line);border-radius:10px;padding:14px}
.kpi small{font-size:12px;color:var(--mute)}.kpi b{display:block;font-size:26px;font-weight:300;letter-spacing:-.02em;margin-top:4px}
.tbl{border:1px solid var(--line);border-radius:10px;overflow:hidden;font-size:13px}
.tbl div{display:grid;grid-template-columns:1.2fr 1.6fr .8fr;gap:10px;padding:10px 14px;align-items:center}
.tbl div+div{border-top:1px solid var(--line)}
.tbl .hd{background:var(--soft);color:var(--mute);font-size:12px}
.st{font-size:11px;padding:2px 8px;border-radius:999px;justify-self:start}
.st.a{background:#E8F6EE;color:#0B7A3B}.st.b{background:#FFF5E0;color:#8A5A00}.st.c{background:var(--red-bg);color:var(--red-d)}
.phone-sc{align-items:center;justify-content:center;background:var(--soft)}
.phone{width:200px;height:92%;max-height:340px;background:#fff;border:8px solid var(--ink);border-radius:28px;padding:16px 12px;display:flex;flex-direction:column;gap:10px;font-size:12px}
.phone .ph-t{font-weight:600;font-size:13px}
.phone .vid{aspect-ratio:16/9;border-radius:8px;background:var(--ink);display:flex;align-items:center;justify-content:center}
.phone .row{padding:8px 10px;font-size:12px}

/* STEPS + VIDEO */
.how .wrap{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.15fr);gap:72px;align-items:center}
.how-l{display:flex;flex-direction:column;gap:36px}
.step{display:grid;grid-template-columns:56px minmax(0,1fr);gap:8px;padding:20px 0;border-top:1px solid var(--line)}
.step:first-child{border-top-color:var(--ink)}.step:last-child{border-bottom:1px solid var(--line)}
.step>span{font-size:36px;font-weight:300;color:var(--red);line-height:1}
.step h3{margin:0 0 6px;font-size:18px;font-weight:600}
.step p{margin:0;font-size:15px;line-height:1.6;color:var(--ink2)}
.video{aspect-ratio:16/9;border-radius:16px;background:var(--ink);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;color:rgba(255,255,255,.75);overflow:hidden;position:relative}
.video iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.play{width:76px;height:76px;border-radius:50%;border:0;background:var(--red);display:flex;align-items:center;justify-content:center;cursor:pointer;box-shadow:0 0 0 0 rgba(234,0,41,.5);animation:pulse 2.4s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(234,0,41,.45)}70%{box-shadow:0 0 0 18px rgba(234,0,41,0)}100%{box-shadow:0 0 0 0 rgba(234,0,41,0)}}
.video b{font-size:15px;font-weight:500;color:#fff}.video small{font-size:13px}

/* COMPARE */
.dark{background:var(--ink);color:#fff}
.dark .wrap{display:flex;flex-direction:column;gap:18px}
.dark .h2{color:#fff;max-width:20ch}
.dark .lead{color:rgba(255,255,255,.72);max-width:54ch}
.vs{margin-top:32px;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1px;background:rgba(255,255,255,.14);border-radius:16px;overflow:hidden}
.vs>div{background:var(--ink);padding:32px 36px;display:flex;flex-direction:column;gap:16px}
.vs>div.good{background:#1A2430}
.vs .hd{font-size:16px;font-weight:500;color:rgba(255,255,255,.65)}
.vs .good .hd{font-weight:600;color:#fff}
.vs .li{display:flex;gap:12px;font-size:16px;line-height:1.5;color:rgba(255,255,255,.78)}
.vs .good .li{color:#fff}
.vs .li svg{flex-shrink:0;margin-top:4px}

/* PRICING */
.price .wrap{display:flex;flex-direction:column;gap:48px}
.plans{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;align-items:stretch}
.plan{background:#fff;border:1px solid var(--line);border-radius:16px;padding:30px;display:flex;flex-direction:column;gap:6px;position:relative}
.plan.hot{border:2px solid var(--red)}
.plan .badge{position:absolute;top:-13px;left:28px;background:var(--red);color:#fff;font-size:12px;font-weight:600;padding:4px 10px;border-radius:999px}
.plan .nm{font-size:18px;font-weight:600}
.plan .ds{font-size:14px;color:var(--mute)}
.plan .pr{margin-top:16px;font-size:40px;font-weight:300;letter-spacing:-.02em;display:block}
.plan .pr small{font-size:15px;color:var(--mute);letter-spacing:0}
.plan ul{margin:16px 0 24px;padding:0;list-style:none;display:flex;flex-direction:column;gap:10px;font-size:15px;color:var(--ink2)}
.plan li{display:flex;gap:10px;line-height:1.45}
.plan li::before{content:"";width:14px;height:14px;flex-shrink:0;margin-top:3px;background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 14 14' fill='none' stroke='%2312A150' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M2.5 7.5l3 3 6-7'/%3E%3C/svg%3E") no-repeat center/14px}
.plan .btn,.plan .btn-o{margin-top:auto;height:50px;font-size:15px}
.btn-o{display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--line2);border-radius:10px;background:#fff;color:var(--ink);font:600 15px 'Inter',sans-serif;text-decoration:none}
.btn-o:hover{border-color:var(--ink);color:var(--ink)}
.price .foot{margin:0;font-size:15px;color:var(--ink2)}

/* FAQ */
.faq .wrap{display:grid;grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr);gap:80px}
.faq-l{display:flex;flex-direction:column;gap:16px}
.faq-l p{margin:0;font-size:16px;line-height:1.6;color:var(--ink2)}
.qa-list{border-top:1px solid var(--line2)}
.qa{border-bottom:1px solid var(--line2)}
.qa button{width:100%;min-height:64px;display:flex;justify-content:space-between;align-items:center;gap:16px;background:transparent;border:0;padding:18px 0;font:500 17px 'Inter',sans-serif;color:var(--ink);text-align:left;cursor:pointer}
.qa button span{font-size:24px;font-weight:300;color:var(--mute);flex-shrink:0;transition:transform .2s}
.qa.open button span{transform:rotate(45deg)}
.qa .ans{display:grid;grid-template-rows:0fr;transition:grid-template-rows .25s ease}
.qa.open .ans{grid-template-rows:1fr}
.qa .ans>div{overflow:hidden}
.qa .ans p{margin:0 0 20px;font-size:15px;line-height:1.65;color:var(--ink2);max-width:62ch}

/* CTA + FOOTER */
.cta{padding:0 0 96px}
.cta-box{background:var(--red);color:#fff;border-radius:24px;padding:64px;display:flex;justify-content:space-between;align-items:center;gap:40px}
.cta-box .h2{color:#fff;max-width:20ch}
.cta-box a{flex-shrink:0;display:inline-flex;align-items:center;height:56px;padding:0 28px;border-radius:10px;background:#fff;color:var(--red-d);font-weight:600;font-size:16px;text-decoration:none}
.cta-box a:hover{background:var(--ink);color:#fff}
footer{background:var(--ink);color:rgba(255,255,255,.7);padding:40px 0}
footer .wrap{display:flex;justify-content:space-between;gap:24px;font-size:14px;flex-wrap:wrap}
footer .fl{display:flex;gap:24px;flex-wrap:wrap}
footer a{color:rgba(255,255,255,.8);text-decoration:none}footer a:hover{color:#fff}

/* STICKY MOBILE CTA */
.sticky{position:fixed;left:0;right:0;bottom:0;z-index:60;background:#fff;border-top:1px solid var(--line);padding:10px 16px calc(10px + env(safe-area-inset-bottom));display:none;transform:translateY(100%);transition:transform .25s}
.sticky.show{transform:none}
.sticky .btn{width:100%;height:50px}

/* reveal */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease}
.reveal.vis{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none}.toast,.play{animation:none}html{scroll-behavior:auto}}

/* ============ RESPONSIVE ============ */
@media (max-width:1100px){
  .nav nav{gap:22px;font-size:14px}
  .hero h1{font-size:46px}
  .cards{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:960px){
  .proof .wrap{flex-direction:column;align-items:flex-start;gap:24px}.logos{max-width:none;width:100%}
  .wrap{padding:0 28px}
  .sec{padding:80px 0}
  .h2{font-size:36px}
  .nav nav{display:none}
  .hero{padding:48px 0 72px}
  .hero .wrap,.pack .wrap,.how .wrap,.faq .wrap,.demo-g{grid-template-columns:1fr;gap:48px}
  .hero h1{max-width:18ch}
  .mock-wrap{max-width:640px}
  .pain-grid{grid-template-columns:1fr}
  .pain,.pain:first-child,.pain:last-child{padding:28px 0;border-left:0;border-top:1px solid var(--line)}
  .pain:first-child{border-top:0}
  .grp{grid-template-columns:1fr;gap:16px}
  .plans{grid-template-columns:1fr;max-width:520px}
  .cta-box{flex-direction:column;align-items:flex-start;padding:44px}
  .c-head{flex-direction:column;align-items:flex-start;gap:24px}
  .sticky{display:block}
  body{padding-bottom:72px}
}
@media (max-width:560px){
  html,body{overflow-x:hidden;width:100%}
  .wrap{padding:0 16px}
  .sec{padding:64px 0}
  .h2{font-size:28px;line-height:1.18;word-break:break-word}
  .lead{font-size:16px}
  .nav .wrap{height:60px;gap:12px}
  .brand small,.nav .login{display:none}
  .nav .btn{height:40px;padding:0 14px;font-size:14px}
  .hero{padding:32px 0 56px}
  .hero h1{font-size:32px;line-height:1.14;letter-spacing:-.02em;overflow-wrap:break-word}
  .hero .sub{font-size:16px}
  .form{padding:18px}
  .fgrid{grid-template-columns:1fr;gap:12px}
  .mock-wrap{padding:16px 0 0 0}
  .mock-bg{display:none}
  .mock-body{grid-template-columns:1fr;min-height:0}
  .side{display:none}
  .main{padding:16px}
  .pi small{display:none}
  .toast{display:none}
  .mock-note{margin-top:14px}
  .proof{padding:28px 0}
  .proof .wrap{flex-direction:column;align-items:stretch;gap:20px}
  .proof-t{max-width:none;font-size:14px}
  .logos{grid-template-columns:repeat(4,minmax(0,1fr));gap:8px}
  .lg{height:44px;padding:6px}
  .lg img{max-height:28px}
  .lg.sq img{max-height:34px}
  .pain-grid{margin-top:32px}
  .pain h3{font-size:19px}
  .receipt{padding:22px}
  .rc{font-size:14px}
  .rc-t .big{font-size:40px}
  .ten b{font-size:80px}
  .grp.first{margin-top:36px}
  .cards{grid-template-columns:1fr;gap:12px}
  .card{flex-direction:row}
  .thumb{aspect-ratio:auto;width:96px;flex-shrink:0;flex-direction:column;align-items:flex-start;justify-content:flex-end}
  .thumb .tag{display:none}.thumb .ic{font-size:30px;right:auto;left:12px;top:12px;opacity:.35}
  .card-b{padding:12px 14px}
  .c-foot{flex-direction:column;align-items:stretch}
  .tabs{flex-wrap:nowrap;overflow-x:auto;margin:0 -16px;padding:0 16px 4px;scrollbar-width:none}
  .tabs::-webkit-scrollbar{display:none}
  .shot{aspect-ratio:auto;min-height:340px}
  .screen{padding:14px}
  .files,.kpis{grid-template-columns:repeat(2,minmax(0,1fr))}
  .files .file:nth-child(n+5),.kpis .kpi:nth-child(3){display:none}
  .tbl div{grid-template-columns:1fr 1fr .9fr}
  .vs{grid-template-columns:1fr}
  .vs>div{padding:24px 20px}
  .vs .li{font-size:15px}
  .plan{padding:24px}
  .plan .pr{font-size:32px}
  .qa button{font-size:16px}
  .cta{padding:0 0 56px}
  .cta-box{padding:32px 22px;border-radius:18px}
  .cta-box a{width:100%;justify-content:center}
  footer .wrap{flex-direction:column}
}

/* ============ TYPOGRAPHY v2: nhấn thông điệp ============ */
:root{--head:'Be Vietnam Pro','Inter',system-ui,sans-serif}
.h2,.hero h1,.pain h3,.pane h3,.step h3,.card-b b,.grp-n b,.plan .nm,.qa button,.vs .hd,.rc-h b,.done-h,.sc-h b{font-family:var(--head)}
.hero h1{font-size:52px;line-height:1.12;font-weight:700;letter-spacing:-.035em;max-width:18ch}
.h2{font-weight:700;font-size:42px;line-height:1.16;letter-spacing:-.03em}
.hl{color:var(--red)}
.dark .hl{color:#FF5A73}
.mk{text-decoration:underline;text-decoration-thickness:.09em;text-underline-offset:.16em;text-decoration-color:rgba(255,255,255,.85)}
strong{font-weight:600;color:var(--ink)}
.dark strong{color:#fff}
.hero .sub{font-size:18px}
.pill{font-weight:600;letter-spacing:.01em}
.proof-t{font-size:16px}
.proof-t b{font-weight:700}
.q{font-family:var(--head);font-weight:800;font-size:56px;line-height:.8;height:30px}
.pain h3{font-size:22px;line-height:1.3;font-weight:700;letter-spacing:-.02em}
.pain p.fix{margin-top:10px;padding:14px 16px;border:0;border-left:3px solid var(--red);background:#FFF5F6;border-radius:0 10px 10px 0;font-size:15.5px}
.pain p.fix b{display:block;font-family:var(--head);font-size:13px;text-transform:uppercase;letter-spacing:.06em;margin-bottom:4px}
.note{border-left:3px solid var(--green)}
.rc-t .big{font-family:var(--head);font-weight:800;letter-spacing:-.04em}
.rc-t>span{font-weight:600}
.ten b{font-family:var(--head);font-weight:800;letter-spacing:-.06em}
.ten span{font-weight:600;color:var(--ink)}
.card-b b{font-weight:700;letter-spacing:-.01em}
.grp-n b{font-weight:700}
.c-foot p{font-size:16px}
.pane h3{font-size:26px;font-weight:700;letter-spacing:-.02em}
.step>span{font-family:var(--head);font-weight:800;font-size:40px}
.step h3{font-size:19px;font-weight:700}
.vs .hd{font-size:18px;font-weight:600;padding-bottom:14px;border-bottom:1px solid rgba(255,255,255,.12)}
.vs .good .hd{font-weight:700;color:#FF5A73}
.vs .good .li{font-weight:500}
.plan .nm{font-size:20px;font-weight:800;letter-spacing:-.01em}
.plan .pr{font-family:var(--head);font-weight:800;font-size:38px;letter-spacing:-.035em}
.plan.hot .pr{color:var(--red)}
.price .foot{font-size:16px}
.qa button{font-weight:600;font-size:17px;letter-spacing:-.01em}
.cta-box .h2{font-weight:800;font-size:44px;letter-spacing:-.035em;max-width:19ch}
.dark .lead{font-size:19px}
@media (max-width:960px){.hero h1{font-size:44px}.h2{font-size:34px}.cta-box .h2{font-size:36px}}
@media (max-width:560px){
  .hero h1{font-size:31px;line-height:1.18;letter-spacing:-.025em}
  .h2,.cta-box .h2{font-size:27px;line-height:1.22;letter-spacing:-.02em}
  .hero .sub{font-size:16px}
  .pain h3{font-size:19px}
  .pane h3{font-size:22px}
  .plan .pr{font-size:30px}
  .ten b{font-size:80px}
  .q{font-size:46px;height:24px}
}

/* ============ LMS MOCK ANIMATION ============ */
.chk{width:18px;height:18px;border-radius:50%;border:1.5px solid #C9CBD0;flex-shrink:0;display:flex;align-items:center;justify-content:center;transition:background .3s,border-color .3s}
.chk svg{opacity:0;transform:scale(.3);transition:opacity .25s,transform .35s cubic-bezier(.34,1.8,.5,1)}
.chk.is-on{background:var(--green);border-color:var(--green)}
.chk.is-on svg{opacity:1;transform:scale(1)}
.chk.pop{animation:chkpop .5s ease}
@keyframes chkpop{0%{box-shadow:0 0 0 0 rgba(18,161,80,.45)}100%{box-shadow:0 0 0 9px rgba(18,161,80,0)}}
.chk.doing{border-color:#F0F1F3;border-top-color:var(--red);border-right-color:var(--red);animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.pi{transition:opacity .45s ease,transform .45s ease}
.pi .lbl-doing{margin-left:auto;font-size:11px;color:var(--red-d);white-space:nowrap}
.pr .tr i{transition:width 1.1s cubic-bezier(.22,.8,.3,1),background .4s}
.pr.full .tr i{background:var(--green)}
.pr .v{font-variant-numeric:tabular-nums}
.anim .pi.pre{opacity:0;transform:translateY(6px)}
.mock.anim-in{animation:mockin .7s cubic-bezier(.22,.8,.3,1) both}
@keyframes mockin{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:none}}
.caret{display:inline-block;width:1px;height:13px;background:var(--ink);margin-left:2px;vertical-align:-2px;animation:blink 1s steps(1) infinite}
@keyframes blink{50%{opacity:0}}
.toast{transition:opacity .4s ease,translate .4s ease}
.toast.out{opacity:0;translate:0 12px}
@media (prefers-reduced-motion:reduce){.chk.doing{animation:none;border-color:var(--red)}.caret{animation:none}.mock.anim-in{animation:none}}

/* Thumbnail ảnh thật khoá học */
.thumb.has-img{padding:0;background:#EEF0F3}
.thumb.has-img img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .4s ease}
.card:hover .thumb.has-img img{transform:scale(1.04)}
.thumb.has-img .free{position:absolute;right:10px;bottom:10px;box-shadow:0 2px 8px rgba(0,0,0,.25)}
@media (max-width:560px){.card{align-items:center}.thumb,.thumb.has-img{width:136px;aspect-ratio:16/9;margin:8px 0 8px 8px;border-radius:8px;flex-shrink:0}.thumb.has-img .free,.thumb .free{position:absolute;right:6px;bottom:6px;padding:2px 7px;font-size:10px}.thumb .ic{font-size:26px;left:10px;top:8px}.card-b{padding:10px 12px}}

/* Logo Gitiho chuẩn (SVG) */
.gtlogo{display:block;height:28px;width:auto;color:var(--ink);flex-shrink:0}
.brand:hover .gtlogo{color:var(--ink)}
.f-brand{display:flex;align-items:center;gap:20px;flex-wrap:wrap}
.f-logo{height:22px;color:#fff}
footer .wrap{align-items:center}
@media (max-width:560px){.gtlogo{height:22px}.f-logo{height:20px}footer .wrap{align-items:flex-start}}

/* Ảnh chụp điện thoại thật */
.phone.real{width:auto;height:94%;max-height:360px;aspect-ratio:924/2000;padding:0;gap:0;border-width:7px;border-radius:30px;overflow:hidden;position:relative;box-shadow:0 30px 60px -30px rgba(16,24,32,.55)}
.phone.real img{display:block;width:100%;height:100%;object-fit:cover;object-position:top}
@media (max-width:560px){.phone.real{height:300px;max-height:none}}

/* ============ CHUẨN HOÁ MÀU NÚT (khoá mọi trạng thái, chống bị ghi đè) ============ */
.btn,.btn:link,.btn:visited,.btn:hover,.btn:focus,.btn:active,
button.btn,a.btn,.nav a.btn,.sticky a.btn,.plan a.btn,.c-foot a.btn,.done-a a.btn{
  color:#fff!important;-webkit-text-fill-color:#fff!important;text-decoration:none!important;-webkit-appearance:none;appearance:none}
.btn{background:var(--red)}
.btn:hover,.btn:focus-visible{background:var(--red-d)}
.btn-o,.btn-o:link,.btn-o:visited{color:var(--red-d)!important;-webkit-text-fill-color:var(--red-d)!important;border:1.5px solid var(--red)!important;background:#fff;text-decoration:none!important;transition:background .15s,color .15s}
.btn-o:hover,.btn-o:focus-visible,.btn-o:active{background:var(--red)!important;color:#fff!important;-webkit-text-fill-color:#fff!important}
.cta-box a,.cta-box a:link,.cta-box a:visited{color:var(--red-d)!important;-webkit-text-fill-color:var(--red-d)!important;background:#fff;text-decoration:none!important}
.cta-box a:hover,.cta-box a:focus-visible,.cta-box a:active{background:var(--ink)!important;color:#fff!important;-webkit-text-fill-color:#fff!important}
.link-cta,.link-cta:link,.link-cta:visited,.link-cta:hover{color:var(--red-d)!important;-webkit-text-fill-color:var(--red-d)!important}
.tab{-webkit-appearance:none;appearance:none;color:var(--ink);-webkit-text-fill-color:var(--ink)}
.tab.on{color:#fff!important;-webkit-text-fill-color:#fff!important}
.done-a button{color:#fff!important;-webkit-text-fill-color:#fff!important;-webkit-appearance:none;appearance:none}
.play{-webkit-appearance:none;appearance:none}
.play svg{fill:#fff}
.qa button{-webkit-appearance:none;appearance:none;color:var(--ink);-webkit-text-fill-color:var(--ink)}