:root{--ink:#14102b;--ink-2:#221a45;--ink-3:#2f2560;--violet:#6c3cf0;--violet-600:#5a2bd9;--violet-100:#ece6ff;--violet-50:#f6f3ff;--lime:#c6f135;--lime-600:#b0db1f;--lime-50:#f6fde0;--red:#e5484d;--red-50:#fff0f0;--green:#1f9d55;--green-50:#e9f9ef;--zalo:#0068ff;--text:#3d3a52;--muted:#6e6a86;--line:#e7e4f2;--bg:#fff;--soft:#f7f6fc;--r:16px;--r-lg:24px;--sh-sm:0 1px 2px rgba(20,16,43,.06),0 2px 8px rgba(20,16,43,.05);--sh:0 14px 34px -16px rgba(20,16,43,.35);--font:"Lexend",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;--header-h:68px}*,*::before,*::after{box-sizing:border-box}html{overflow-x:clip;scroll-behavior:smooth;scroll-padding-top:calc(var(--header-h) + 12px);-webkit-text-size-adjust:100%}body{margin:0;font-family:var(--font);font-size:16px;line-height:1.65;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;overflow-x:clip}img,svg{max-width:100%}img{height:auto}[hidden]{display:none!important}a{color:var(--violet-600);text-underline-offset:3px}a:hover{color:var(--violet)}h1,h2,h3{color:var(--ink);line-height:1.18;letter-spacing:-.02em;margin:0 0 .5em}h1{font-size:clamp(2rem,4.6vw,3.3rem);font-weight:800}h2{font-size:clamp(1.5rem,3vw,2.2rem);font-weight:800}h3{font-size:1.1rem;font-weight:700}p{margin:0 0 1em}.i{width:1.15em;height:1.15em;flex:none;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;vertical-align:-.2em}.container{width:100%;max-width:1160px;margin:0 auto;padding:0 20px}.narrow{max-width:820px}.center{text-align:center}.skip{position:absolute;left:-999px;top:8px;z-index:100;background:#fff;padding:8px 14px;border-radius:8px}.skip:focus{left:8px}:focus-visible{outline:3px solid var(--violet);outline-offset:2px;border-radius:8px}.devbar{background:#fef08a;color:#713f12;font-size:13px;text-align:center;padding:6px 12px}mark.pending{background:#fde047;color:#422006;padding:0 .2em;border-radius:4px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5em;font:600 1rem/1.2 var(--font);padding:.8em 1.25em;border-radius:14px;border:2px solid transparent;text-decoration:none;cursor:pointer;transition:transform .15s,box-shadow .15s,background .15s,color .15s,border-color .15s;white-space:nowrap}.btn:active{transform:translateY(1px)}.btn:disabled{opacity:.45;cursor:not-allowed}.btn-lg{font-size:1.05rem;padding:.95em 1.45em}.btn-sm{padding:.55em .95em;font-size:.92rem}.btn-block{width:100%}.btn-primary{background:var(--violet);color:#fff;box-shadow:0 10px 22px -10px rgba(108,60,240,.8)}.btn-primary:hover{background:var(--violet-600);color:#fff;transform:translateY(-1px)}.btn-lime{background:var(--lime);color:var(--ink);box-shadow:0 10px 22px -12px rgba(150,190,20,.9)}.btn-lime:hover{background:var(--lime-600);color:var(--ink);transform:translateY(-1px)}.btn-dark{background:var(--ink);color:#fff}.btn-dark:hover{background:var(--ink-3);color:#fff}.btn-ghost{background:#fff;color:var(--ink);border-color:var(--line)}.btn-ghost:hover{border-color:var(--ink);color:var(--ink)}.btn-ghost-light{background:0 0;color:#fff;border-color:rgba(255,255,255,.35)}.btn-ghost-light:hover{border-color:#fff;color:#fff}.btn-zalo{background:var(--zalo);color:#fff}.btn-zalo:hover{color:#fff;filter:brightness(.92)}.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:saturate(1.4)blur(12px);-webkit-backdrop-filter:saturate(1.4)blur(12px);border-bottom:1px solid transparent;transition:border-color .2s,box-shadow .2s}.site-header.scrolled{border-color:var(--line);box-shadow:var(--sh-sm)}.header-row{display:flex;align-items:center;gap:20px;height:var(--header-h)}.logo{display:inline-flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);flex:none}.logo-mark svg{width:36px;height:36px;display:block}.logo-text{font-size:1.15rem;font-weight:600;white-space:nowrap}.logo-text b{font-weight:800;background:var(--lime);color:var(--ink);padding:0 .3em;border-radius:6px}.logo-light{color:#fff}.nav{display:flex;align-items:center;gap:8px;margin-left:auto}.nav>ul{display:flex;gap:2px;list-style:none;margin:0;padding:0}.nav-link{display:inline-flex;align-items:center;gap:4px;padding:10px 11px;border-radius:10px;color:var(--ink);font:500 .95rem var(--font);text-decoration:none;background:0 0;border:0;cursor:pointer;white-space:nowrap}.nav-link:hover{background:var(--violet-50);color:var(--ink)}.nav-link .i{width:16px;height:16px;transition:transform .2s}.has-sub{position:relative}.sub{position:absolute;top:calc(100% + 8px);left:-12px;width:360px;list-style:none;margin:0;padding:8px;background:#fff;border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--sh);opacity:0;visibility:hidden;transform:translateY(6px);transition:all .18s}.has-sub:hover .sub,.has-sub.open .sub{opacity:1;visibility:visible;transform:none}.has-sub.open .sub-toggle .i{transform:rotate(180deg)}.sub a{display:flex;gap:12px;align-items:flex-start;padding:10px 12px;border-radius:12px;text-decoration:none;color:var(--ink)}.sub a:hover{background:var(--violet-50)}.sub a>.i{width:22px;height:22px;color:var(--violet);margin-top:2px}.sub b{display:block;font-weight:600;font-size:.95rem}.sub small{display:block;color:var(--muted);font-size:.83rem}.nav-reg{display:none}.header-cta{display:flex;align-items:center;gap:8px}.btn-top{padding:.65em 1.05em}.menu-btn{display:none;width:44px;height:44px;border-radius:12px;border:1px solid var(--line);background:#fff;color:var(--ink);cursor:pointer;align-items:center;justify-content:center}.menu-btn .i{width:22px;height:22px}.hero{padding:52px 0 72px;background:radial-gradient(800px 420px at 85% -10%,var(--violet-100),transparent 60%),radial-gradient(600px 400px at 0% 110%,var(--lime-50),transparent 60%),#fff}.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:center}.eyebrow{display:inline-flex;align-items:center;gap:6px;font-weight:600;font-size:.88rem;color:var(--ink);background:var(--lime);padding:6px 12px;border-radius:999px;margin-bottom:18px}.hl{background:linear-gradient(transparent 58%,var(--lime) 58%);padding:0 .1em}.lead{font-size:1.12rem;max-width:40em}.pick{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:24px 0 18px}.pick-card{display:flex;align-items:center;gap:12px;padding:16px;border-radius:var(--r);background:var(--ink);color:#fff;text-decoration:none;box-shadow:var(--sh);transition:transform .15s}.pick-card:hover{transform:translateY(-2px);color:#fff}.pick-card b{display:block;font-size:1.05rem}.pick-card small{display:block;color:#c9c3e8;font-size:.82rem}.pick-card>.i{margin-left:auto;color:var(--lime)}.pick-ic .i{width:42px;height:42px;padding:9px;border-radius:12px;background:var(--lime);color:var(--ink)}.pick-b{background:var(--violet)}.pick-b small{color:#e3dbff}.pick-b .pick-ic .i{background:#fff;color:var(--violet)}.chips-row{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:8px 16px;font-size:.92rem;color:var(--ink)}.chips-row .i{color:var(--green)}.hero-phone{position:relative;justify-self:center;width:100%;max-width:360px}.ph{background:#fff;border:10px solid var(--ink);border-radius:36px;padding:18px 16px 20px;box-shadow:0 40px 70px -30px rgba(20,16,43,.55)}.ph-top{display:flex;justify-content:space-between;font-size:.82rem;font-weight:600;color:var(--muted)}.ph-timer{color:var(--violet)}.ph-bar{height:6px;border-radius:9px;background:var(--violet-50);margin:10px 0 12px;overflow:hidden}.ph-bar span{display:block;height:100%;background:var(--violet);border-radius:9px}.ph-q{font-weight:600;color:var(--ink);font-size:.92rem;line-height:1.45;margin-bottom:10px}.ph img{display:block;margin:0 auto 10px;border-radius:8px}.ph-o{border:1.5px solid var(--line);border-radius:12px;padding:8px 12px;font-size:.88rem;margin-top:8px;color:var(--ink)}.ph-o.ok{border-color:var(--green);background:var(--green-50);font-weight:600}.ph-o .i{color:var(--green)}.ph-badge{position:absolute;right:-14px;bottom:36px;display:flex;gap:10px;align-items:center;background:var(--lime);color:var(--ink);padding:10px 14px;border-radius:16px;box-shadow:var(--sh);transform:rotate(-3deg)}.ph-badge .i{width:26px;height:26px}.ph-badge b{display:block}.ph-badge small{font-size:.75rem}.section{padding:76px 0}.section-soft{background:var(--soft)}.section-ink{background:var(--ink);color:#c9c3e8}.section-ink h2,.section-ink h3{color:#fff}.sec-head{max-width:720px;margin:0 auto 36px;text-align:center}.sec-head p:last-child{margin-bottom:0}.kicker{display:inline-block;font-size:.8rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--violet);margin-bottom:10px}.sec-head-light .kicker{color:var(--lime)}.timeline{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.tl{padding:22px;border-radius:var(--r-lg);background:var(--ink-2);border:1px solid var(--ink-3)}.tl-date{display:inline-block;font-size:.8rem;font-weight:700;color:var(--ink);background:#d9d3f5;padding:4px 10px;border-radius:999px;margin-bottom:12px}.tl.done .tl-date{background:#bdb4e6}.tl.next{background:var(--violet);border-color:var(--violet)}.tl.next .tl-date{background:var(--lime)}.tl.next p{color:#efeaff}.tl p{margin:0;font-size:.95rem}.more-link{margin-top:28px}.path{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(4,1fr);gap:14px;counter-reset:p}.path li{counter-increment:p}.path a{position:relative;display:flex;flex-direction:column;gap:6px;height:100%;padding:22px 20px;border:1.5px solid var(--line);border-radius:var(--r-lg);text-decoration:none;color:var(--text);background:#fff;transition:border-color .15s,transform .15s}.path a:hover{border-color:var(--violet);transform:translateY(-2px)}.path a::after{content:counter(p);position:absolute;top:14px;right:16px;font-weight:800;font-size:1.6rem;color:var(--violet-100)}.path b{color:var(--ink);font-size:1.02rem}.path small{font-size:.9rem;color:var(--muted)}.path-ic .i{width:40px;height:40px;padding:9px;border-radius:12px;background:var(--violet-50);color:var(--violet)}.chap-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.chap{display:flex;flex-direction:column;gap:4px;padding:18px;border-radius:var(--r);background:#fff;border:1.5px solid var(--line);text-decoration:none;color:var(--text);transition:border-color .15s,transform .15s}.chap:hover{border-color:var(--violet);transform:translateY(-2px);color:var(--text)}.chap-n{font-size:.78rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--violet)}.chap b{color:var(--ink);line-height:1.35}.chap small{color:var(--muted);font-size:.85rem}.chap-a1{background:var(--lime);border-color:var(--lime)}.chap-a1 .chap-n,.chap-a1 small{color:var(--ink)}.chap-liet{background:var(--red-50);border-color:#f6c9cb}.chap-liet .chap-n{color:var(--red)}.offer-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.offer{position:relative;display:flex;flex-direction:column;padding:26px;border-radius:var(--r-lg);background:var(--soft);border:1.5px solid var(--line);text-decoration:none;color:var(--text);transition:transform .15s,box-shadow .15s}.offer:hover{transform:translateY(-3px);box-shadow:var(--sh);color:var(--text)}.offer-b{background:var(--ink);border-color:var(--ink);color:#c9c3e8}.offer-b:hover{color:#c9c3e8}.offer-b h3,.offer-b .offer-price b{color:#fff}.offer-tag{position:absolute;top:18px;right:18px;font-size:.75rem;font-weight:700;background:var(--violet);color:#fff;padding:4px 10px;border-radius:999px}.offer-b .offer-tag{background:var(--lime);color:var(--ink)}.offer-ic .i{width:48px;height:48px;padding:11px;border-radius:14px;background:var(--lime);color:var(--ink)}.offer h3{margin:14px 0 6px;font-size:1.35rem}.offer-price{margin-bottom:10px}.offer-price b{font-size:1.6rem;color:var(--ink)}.offer-price small{display:block;font-size:.85rem}.offer ul{margin:0 0 14px;padding-left:1.2em;font-size:.95rem}.cc-more{display:inline-flex;align-items:center;gap:6px;font-weight:600;color:var(--violet);margin-top:auto}.offer-b .cc-more{color:var(--lime)}.snap{display:grid;grid-template-columns:repeat(6,1fr);gap:12px}.snap figure{margin:0;position:relative;border-radius:var(--r);overflow:hidden;aspect-ratio:3/4;background:var(--violet-50)}.snap img{width:100%;height:100%;object-fit:cover;display:block}.snap figcaption{position:absolute;left:0;right:0;bottom:0;padding:22px 10px 8px;font-size:.78rem;color:#fff;background:linear-gradient(transparent,rgba(20,16,43,.85))}.faq{display:grid;gap:10px}.faq-item{border:1.5px solid var(--line);border-radius:var(--r);background:#fff}.faq-item[open]{border-color:var(--violet-100);box-shadow:var(--sh-sm)}.faq-item summary{display:flex;justify-content:space-between;gap:16px;align-items:center;padding:16px 20px;cursor:pointer;font-weight:600;color:var(--ink);list-style:none}.faq-item summary::-webkit-details-marker{display:none}.faq-item summary .i{color:var(--violet);transition:transform .2s}.faq-item[open] summary .i{transform:rotate(45deg)}.faq-a{padding:0 20px 16px}.faq-a p:last-child{margin:0}.section-reg{background:linear-gradient(180deg,var(--soft),#fff)}.reg-grid{display:grid;grid-template-columns:1fr 1fr;gap:52px;align-items:center}.checks{list-style:none;padding:0;margin:18px 0 24px;display:grid;gap:10px}.checks li{display:flex;gap:10px}.checks .i{color:var(--green);margin-top:4px}.reg-alt{display:flex;flex-wrap:wrap;gap:10px}.card-float{background:#fff;border:1.5px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--sh);padding:26px}.lform-head{margin-bottom:16px}.lform-title{font-size:1.3rem;margin-bottom:4px}.lform-head p{margin:0;color:var(--muted);font-size:.94rem}.fgrid{display:grid;grid-template-columns:1fr 1fr;gap:12px 14px;margin-bottom:16px}.field{display:flex;flex-direction:column;gap:6px;margin:0;min-width:0}.field-full{grid-column:1/-1}.field>span{font-size:.9rem;font-weight:600;color:var(--ink)}.field input,.field select{width:100%;font:inherit;font-size:16px;color:var(--ink);background:#fff;border:1.5px solid var(--line);border-radius:12px;padding:.72em .9em}.field input:focus,.field select:focus{outline:0;border-color:var(--violet);box-shadow:0 0 0 4px var(--violet-100)}.field.invalid input{border-color:var(--red);box-shadow:0 0 0 4px var(--red-50)}.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}.lform-note{display:flex;gap:8px;font-size:.84rem;color:var(--muted);margin:12px 0 0}.lform-note .i{color:var(--green);margin-top:3px}.lform.sending button[type=submit]{opacity:.6;pointer-events:none}.lform-msg{margin-top:14px;padding:14px 16px;border-radius:12px;font-size:.95rem}.lform-msg.ok{background:var(--green-50);color:#0f5132}.lform-msg.err{background:var(--red-50);color:#7a1f22}.lform-msg .btn{margin-top:10px}.page-hero{padding:40px 0 36px;background:var(--soft);border-bottom:1px solid var(--line)}.page-hero h1{font-size:clamp(1.75rem,3.6vw,2.6rem)}.page-hero .lead{margin-bottom:0}.hero-cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}.crumbs{display:flex;flex-wrap:wrap;gap:8px;font-size:.86rem;color:var(--muted);margin-bottom:14px}.crumbs a{color:var(--muted)}.crumbs-light,.crumbs-light a{color:#bdb4e6}.page-body{padding-top:40px;padding-bottom:64px}.content-grid{display:grid;grid-template-columns:minmax(0,1fr)360px;gap:44px;align-items:start}.side-sticky{position:sticky;top:calc(var(--header-h) + 20px)}.prose{min-width:0}.prose h2{margin-top:1.7em;font-size:clamp(1.3rem,2.4vw,1.65rem)}.prose h2:first-child{margin-top:0}.prose h3{margin-top:1.3em}.prose ul,.prose ol{padding-left:1.25em}.prose li{margin:.35em 0}.prose img{border-radius:var(--r)}.prose table{width:100%;border-collapse:collapse;font-size:.95rem;margin:1em 0}.prose th,.prose td{border:1px solid var(--line);padding:10px 12px;text-align:left;vertical-align:top}.prose thead th{background:var(--violet-50);color:var(--ink)}.table-wrap{overflow-x:auto}.note{display:flex;gap:12px;padding:14px 18px;border-radius:14px;margin:1.4em 0;background:var(--violet-50);color:var(--ink)}.note .i{color:var(--violet);margin-top:4px}.note-warn{background:var(--red-50)}.note-warn .i{color:var(--red)}.note p:last-child{margin:0}.count-note{font-size:.92rem;color:var(--muted);margin:0 0 18px}.qlist{display:grid;gap:14px}.qi{padding:18px 20px;border:1.5px solid var(--line);border-radius:var(--r);background:#fff}.qi-liet{border-color:#f6c9cb}.qi h3{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:.95rem;margin:0 0 8px}.qi-n{color:var(--violet)}.tag-liet{display:inline-block;font-size:.72rem;font-weight:700;color:#fff;background:var(--red);padding:2px 8px;border-radius:999px;vertical-align:middle}.tag-a1{display:inline-block;font-size:.72rem;font-weight:700;color:var(--ink);background:var(--lime);padding:2px 8px;border-radius:999px}.qi-q{font-weight:600;color:var(--ink);margin-bottom:10px}.qi-img{display:block;max-width:100%;max-height:320px;width:auto;margin:0 0 10px;border-radius:10px}.qi-o{margin:0;padding-left:1.4em}.qi-o li{margin:.3em 0}.qi-o li.ok{color:var(--green);font-weight:600}.ok-tag{display:inline-flex;align-items:center;gap:3px;font-size:.75rem;background:var(--green-50);color:var(--green);padding:1px 8px;border-radius:999px;margin-left:4px}.app-hero{padding:36px 0 90px;background:var(--ink);color:#c9c3e8}.app-hero h1{color:#fff;font-size:clamp(1.6rem,3.4vw,2.4rem)}.app-hero .lead{color:#d6d0f2;margin:0}.app-wrap{margin-top:-70px}.quiz{max-width:820px;margin:0 auto;background:#fff;border-radius:var(--r-lg);box-shadow:var(--sh);border:1.5px solid var(--line);padding:22px;min-height:320px}.quiz-loading{display:flex;align-items:center;justify-content:center;gap:8px;min-height:260px;color:var(--muted)}.exam-start{text-align:center;padding:16px 6px}.es-ic .i{width:64px;height:64px;padding:14px;border-radius:18px;background:var(--lime);color:var(--ink)}.exam-start h2{margin:14px 0 10px}.es-facts{list-style:none;padding:0;margin:0 0 14px;display:flex;flex-wrap:wrap;justify-content:center;gap:8px}.es-facts li{background:var(--violet-50);color:var(--ink);padding:6px 12px;border-radius:999px;font-size:.92rem}.exam-start p{color:var(--muted);max-width:560px;margin:0 auto 18px}.exam-bar{display:flex;align-items:center;gap:12px;margin-bottom:10px}.exam-name{display:inline-flex;align-items:center;gap:6px;font-weight:700;color:var(--ink)}.exam-time{margin-left:auto;font-weight:800;font-size:1.1rem;color:var(--violet);font-variant-numeric:tabular-nums}.exam-time.low{color:var(--red)}.exam-progress{height:6px;border-radius:9px;background:var(--violet-50);overflow:hidden;margin-bottom:16px}.exam-progress span{display:block;height:100%;background:var(--violet);transition:width .2s}.qcard{margin-bottom:6px}.q-meta{display:flex;flex-wrap:wrap;align-items:center;gap:8px 12px;font-size:.84rem;color:var(--muted);margin-bottom:8px}.q-meta>span:first-child{font-weight:700;color:var(--violet)}.q-text{font-size:1.08rem;font-weight:600;color:var(--ink);line-height:1.5}.q-img{display:block;max-width:100%;max-height:360px;width:auto;margin:0 auto 14px;border-radius:12px}.opts{display:grid;gap:10px}.opt{display:flex;gap:12px;align-items:flex-start;width:100%;text-align:left;font:inherit;font-size:1rem;color:var(--ink);background:#fff;border:2px solid var(--line);border-radius:14px;padding:12px 14px;cursor:pointer;transition:border-color .12s,background .12s}.opt:hover:not(:disabled){border-color:var(--violet)}.opt-k{flex:none;display:grid;place-items:center;width:28px;height:28px;border-radius:9px;background:var(--violet-50);color:var(--violet);font-weight:700;font-size:.9rem}.opt.chosen{border-color:var(--violet);background:var(--violet-50)}.opt.chosen .opt-k{background:var(--violet);color:#fff}.opt.right{border-color:var(--green);background:var(--green-50)}.opt.right .opt-k{background:var(--green);color:#fff}.opt.wrong{border-color:var(--red);background:var(--red-50)}.opt.wrong .opt-k{background:var(--red);color:#fff}.opt:disabled{cursor:default}.q-nav{display:flex;align-items:center;justify-content:space-between;gap:10px;margin:18px 0 14px}.jump{display:flex;align-items:center;gap:6px;font-size:.9rem;color:var(--muted)}.jump input{width:70px;font:inherit;padding:.4em .5em;border:1.5px solid var(--line);border-radius:10px;text-align:center}.palette{display:grid;grid-template-columns:repeat(auto-fill,minmax(40px,1fr));gap:6px}.palette button{height:40px;border-radius:10px;border:1.5px solid var(--line);background:#fff;font:600 .9rem var(--font);color:var(--ink);cursor:pointer}.palette button.done{background:var(--violet-50);border-color:var(--violet-100)}.palette button.cur{border-color:var(--violet);background:var(--violet);color:#fff}.exam-note{font-size:.85rem;color:var(--muted);margin:12px 0 0;text-align:center}.result .res-head{display:flex;gap:14px;align-items:flex-start;padding:18px;border-radius:var(--r);margin-bottom:16px}.result.pass .res-head{background:var(--green-50);color:#0f5132}.result.fail .res-head{background:var(--red-50);color:#7a1f22}.res-head>.i{width:44px;height:44px;flex:none}.res-score{font-size:1.6rem;font-weight:800;margin:0 0 4px}.res-head p{margin:0 0 4px}.res-streak{font-size:.92rem}.res-act{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:22px}.res-h{margin:8px 0 12px}.review{display:grid;gap:14px}.review .qcard{padding:16px;border:1.5px solid var(--line);border-radius:var(--r)}.practice .sets{display:flex;gap:8px;overflow-x:auto;padding-bottom:8px;margin-bottom:12px;scrollbar-width:thin}.chip-btn{flex:none;font:500 .88rem var(--font);padding:.5em .9em;border-radius:999px;border:1.5px solid var(--line);background:#fff;color:var(--ink);cursor:pointer;white-space:nowrap}.chip-btn.on{background:var(--ink);border-color:var(--ink);color:#fff}.pr-stat{display:flex;justify-content:space-between;gap:10px;font-size:.88rem;color:var(--muted);margin-bottom:6px}.pr-stat span:first-child{font-weight:700;color:var(--ink)}.fb{display:flex;align-items:center;gap:8px;padding:12px 14px;border-radius:12px;margin-top:12px;font-size:.95rem}.fb.ok{background:var(--green-50);color:#0f5132}.fb.no{background:var(--red-50);color:#7a1f22}.empty{text-align:center;padding:30px 10px;color:var(--muted)}.empty .i{width:40px;height:40px;color:var(--green)}.cta-band{background:var(--violet);color:#efeaff;padding:52px 0}.cta-inner{display:flex;align-items:center;justify-content:space-between;gap:28px}.cta-band h2{color:#fff;margin-bottom:.3em;font-size:clamp(1.35rem,2.6vw,1.85rem)}.cta-band p{margin:0}.cta-actions{display:flex;flex-wrap:wrap;gap:12px;flex:none}.site-footer{background:var(--ink);color:#bdb4e6;padding:52px 0 0;font-size:.94rem}.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:36px}.site-footer h3{color:#fff;font-size:1rem;margin-bottom:12px}.site-footer ul{list-style:none;margin:0;padding:0;display:grid;gap:8px}.site-footer a{color:#e3defa;text-decoration:none}.site-footer a:hover{color:#fff;text-decoration:underline}.f-brand p{margin:14px 0}.f-contact{display:grid;gap:8px}.f-contact>*{display:flex;gap:8px;align-items:center}.f-contact .i{color:var(--lime)}.f-legal{margin-top:36px;padding-top:22px;border-top:1px solid rgba(255,255,255,.1);font-size:.84rem}.f-legal p{margin:0 0 6px}.f-bottom{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;padding:18px 20px;font-size:.82rem;color:#8f87b8}.mobile-bar{display:none}@media(max-width:1060px){.nav-link{padding:10px 8px;font-size:.92rem}.chap-grid{grid-template-columns:repeat(3,1fr)}.snap{grid-template-columns:repeat(3,1fr)}}@media(max-width:960px){.menu-btn{display:inline-flex}.nav{position:fixed;inset:var(--header-h)0 0 0;background:#fff;flex-direction:column;align-items:stretch;padding:16px 20px 120px;overflow-y:auto;transform:translateX(100%);transition:transform .25s;visibility:hidden}.nav.open{transform:none;visibility:visible}.nav>ul{flex-direction:column}.nav-link{width:100%;justify-content:space-between;padding:14px 8px;font-size:1.05rem;border-bottom:1px solid var(--line);border-radius:0}.sub{position:static;width:auto;box-shadow:none;border:0;padding:0 0 8px;display:none;opacity:1;visibility:visible;transform:none}.has-sub.open .sub{display:block}.has-sub:hover .sub{display:none}.has-sub.open:hover .sub{display:block}.nav-reg{display:inline-flex;margin-top:18px}.hero-grid,.reg-grid{grid-template-columns:1fr;gap:40px}.timeline,.path{grid-template-columns:1fr 1fr}.content-grid{grid-template-columns:1fr}.side-sticky{position:static}.footer-grid{grid-template-columns:1fr 1fr}.f-brand{grid-column:1/-1}.cta-inner{flex-direction:column;align-items:flex-start}}@media(max-width:640px){:root{--header-h:62px}body{padding-bottom:68px}.container{padding:0 16px}.section{padding:54px 0}.hero{padding:28px 0 48px}.pick{grid-template-columns:1fr}.timeline,.path,.offer-grid,.fgrid,.footer-grid{grid-template-columns:1fr}.chap-grid{grid-template-columns:1fr 1fr}.snap{grid-template-columns:1fr 1fr}.btn-top{display:none}.ph-badge{right:0}.quiz{padding:16px;border-radius:var(--r)}.app-hero{padding:26px 0 84px}.q-text{font-size:1rem}.cta-actions .btn,.hero-cta .btn{flex:1 1 100%}.mobile-bar{display:grid;grid-template-columns:.9fr .8fr 1.8fr;position:fixed;left:0;right:0;bottom:0;z-index:60;background:#fff;border-top:1px solid var(--line);box-shadow:0 -6px 20px rgba(20,16,43,8%);padding:8px 10px calc(8px + env(safe-area-inset-bottom));gap:8px}.mobile-bar a{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;padding:6px 4px;border-radius:12px;text-decoration:none;font-size:.78rem;font-weight:600;color:var(--ink);white-space:nowrap}.mobile-bar .i{width:22px;height:22px}.mb-quiz{background:var(--lime)}.mb-zalo{color:var(--zalo)!important}.mb-reg{flex-direction:row!important;gap:8px!important;background:var(--violet);color:#fff!important;font-size:.92rem!important}}@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}.photo{margin:1.4em 0}.photo img{width:100%;max-width:460px;height:auto;border-radius:var(--r);display:block}.photo figcaption{font-size:.86rem;color:var(--muted);margin-top:6px}.src-note{font-size:.84rem;color:var(--muted);border-top:1px solid var(--line);padding-top:12px;margin-top:2em}.offer-grid+h2{margin-top:1.6em}