@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Manrope:wght@400;500;600;700;800&display=swap');
:root{--navy:#101f37;--blue:#2563eb;--bg:#f8fafc;--muted:#637087;--line:#e3e8ef}*{box-sizing:border-box}body{margin:0;color:var(--navy);background:var(--bg);font-family:'DM Sans',Arial,sans-serif;line-height:1.6}h1,h2,h3,.brand{font-family:Manrope,Arial,sans-serif}h1,h2,h3,p{margin-top:0}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}button,a,input,select,summary{ -webkit-tap-highlight-color:transparent}button{cursor:pointer}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible,textarea:focus-visible{outline:3px solid #f59e0b;outline-offset:4px}.announcement{background:var(--navy);color:#d7e0f0;text-align:center;padding:10px 20px;font-size:12px}.announcement a{color:white;margin-left:20px;text-decoration:underline;text-underline-offset:4px}header{display:flex;align-items:center;gap:38px;max-width:1440px;margin:auto;padding:24px 5%;background:white}.brand{display:inline-flex;align-items:center;gap:10px;font-size:23px;font-weight:800;line-height:1.1;white-space:nowrap}.brand-mark{background:var(--blue);color:white;width:43px;height:44px;border-radius:10px;display:grid;place-content:center;font-size:27px;position:relative}.brand-mark span{position:absolute;font-size:21px;right:4px;top:0}.brand-sub{display:block;font-size:9px;letter-spacing:3.3px;margin-top:5px}nav{display:flex;gap:24px;margin:auto;font-size:13px;font-weight:600}nav a:hover,nav a.active{color:var(--blue)}.header-actions{display:flex;gap:16px;align-items:center;font-size:12px;white-space:nowrap}.button{display:inline-flex;justify-content:center;align-items:center;gap:16px;background:var(--blue);color:#fff;border:1px solid var(--blue);border-radius:7px;padding:13px 22px;font-size:14px;font-weight:600;transition:transform .2s,background .2s}.button:hover{background:#194cc0;transform:translateY(-2px)}.button.secondary{background:white;color:var(--navy);border-color:var(--line)}.button.small{padding:9px 15px;font-size:12px}.language{border:0;background:none;color:var(--muted);padding:6px}.menu-toggle{display:none}.wrap{max-width:1240px;margin:auto;padding:0 28px}.hero{padding:65px 0 56px;background:linear-gradient(120deg,#f1f6ff,#f8fafc 65%);position:relative;overflow:hidden}.hero-grid{display:grid;grid-template-columns:1.15fr 1fr;gap:50px;align-items:center}.eyebrow{display:flex;align-items:center;gap:9px;font-size:11px;font-weight:700;letter-spacing:1.8px;text-transform:uppercase;color:var(--blue);margin-bottom:22px}.eyebrow:before{content:'';width:7px;height:7px;background:#f59e0b;border-radius:50%}h1{font-size:58px;line-height:1.13;letter-spacing:-2.8px;margin-bottom:24px}h1 em{font-style:normal;color:var(--blue)}.hero p{max-width:450px;font-size:15px;color:var(--muted);line-height:1.8}.hero-actions{display:flex;gap:12px;margin:28px 0}.hero-note{font-size:11px;color:var(--muted);display:flex;gap:20px}.hero-note span:before{content:'✓';color:var(--blue);margin-right:6px}.hero-art{height:390px;position:relative;display:grid;place-items:center}.orbit{position:absolute;border:1px solid #dbe4f1;border-radius:50%;width:365px;height:365px}.orbit:after{content:'';position:absolute;inset:35px;border:1px dashed #d2ddef;border-radius:50%}.art-book{width:235px;height:295px;background:var(--navy);color:white;padding:26px;border-radius:4px 12px 12px 4px;transform:rotate(-9deg);box-shadow:18px 23px 40px #101f3726;border-left:8px solid #2d3e58;position:relative}.art-book small{font-size:8px;letter-spacing:2px;color:#c4d6f9}.art-book h2{font-size:30px;line-height:1.2;margin-top:27px;letter-spacing:-1px}.art-book .asterisk{position:absolute;font-size:100px;color:#80aaff;line-height:1;bottom:28px;right:24px}.art-book>span{position:absolute;bottom:20px;font-size:8px;letter-spacing:2px}.float-card{position:absolute;z-index:2;background:white;border:1px solid #e8edf4;border-radius:12px;padding:13px 18px;box-shadow:0 12px 40px #13284b0e;font-size:12px;display:flex;gap:12px;align-items:center}.float-card b{display:block;font-size:12px}.float-card small{color:var(--muted);font-size:10px}.float-card.top{right:0;top:45px}.float-card.bottom{left:0;bottom:40px}.float-icon{background:#edf4ff;color:var(--blue);border-radius:9px;padding:8px;font-size:20px}.spark{position:absolute;color:#f59e0b;font-size:40px;top:4px;left:55px}.trust-strip{display:flex;justify-content:center;gap:64px;padding:22px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);font-size:12px;background:white;color:var(--muted)}.trust-strip b{color:var(--navy);margin-right:8px}.section{padding:65px 0}.section-head{display:flex;justify-content:space-between;align-items:end;margin-bottom:27px;gap:20px}.section-head h2{font-size:29px;letter-spacing:-1px;margin-bottom:5px}.section-head p{color:var(--muted);font-size:14px;margin:0}.text-link{font-size:13px;font-weight:600;color:var(--blue)}.search-bar{display:flex;background:#fff;border:1px solid var(--line);border-radius:9px;padding:7px;margin:0 0 25px;gap:10px;align-items:center}.search-bar>span{font-size:24px;padding-left:10px;color:var(--muted)}.search-bar input{border:0;outline:0;flex:1;min-width:0;padding:9px;background:none;font-size:14px}.category-list{display:flex;flex-wrap:wrap;gap:9px;margin:20px 0 27px}.chip{border:1px solid var(--line);background:white;color:#536076;border-radius:6px;padding:8px 13px;font-size:12px}.chip:hover,.chip.active{background:var(--navy);color:white;border-color:var(--navy)}.grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}.card{background:white;border:1px solid var(--line);border-radius:11px;overflow:hidden;transition:transform .2s,box-shadow .2s}.card:hover{transform:translateY(-5px);box-shadow:0 15px 30px #14284a0d}.cover{height:182px;position:relative;padding:20px;color:var(--navy);overflow:hidden;display:block}.cover:after{content:'';width:170px;height:170px;border:1px solid #ffffff80;border-radius:50%;position:absolute;right:-50px;bottom:-85px}.cover-label{font-size:8px;letter-spacing:1.8px;font-weight:700}.cover-title{display:block;font-family:Manrope,Arial,sans-serif;font-size:24px;line-height:1.15;font-weight:800;white-space:pre-line;letter-spacing:-.9px;margin-top:24px;position:relative;z-index:1}.cover-symbol{position:absolute;right:15px;bottom:0;font-size:75px;line-height:1;color:#101f3724}.cover-brand{position:absolute;bottom:13px;font-size:7px;letter-spacing:1.5px}.card-body{padding:19px}.tag-row{display:flex;justify-content:space-between;gap:5px;align-items:center;font-size:9px;color:var(--muted);margin-bottom:10px}.badge{font-size:9px;font-weight:700;padding:3px 7px;border-radius:4px;background:#ecf7f0;color:#27714b}.badge.premium{background:#fff4df;color:#9b640c}.card h3{font-size:15px;line-height:1.4;min-height:42px;margin-bottom:7px;letter-spacing:-.3px}.card p{font-size:11px;color:var(--muted);min-height:36px;margin-bottom:16px}.card-bottom{border-top:1px solid #eef1f5;padding-top:13px;display:flex;justify-content:space-between;align-items:center;font-size:13px}.card-bottom button{border:0;background:none;color:var(--blue);font-size:11px;font-weight:600}.price{font-weight:700}.price.free{color:#27714b}.category-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:13px}.category-tile{display:flex;align-items:center;gap:13px;padding:18px;background:white;border:1px solid var(--line);border-radius:9px;font-size:12px;font-weight:600}.category-tile span{font-size:24px;color:var(--blue);background:#eff4ff;width:40px;height:40px;text-align:center;line-height:40px;border-radius:8px}.benefits{background:var(--navy);color:white;border-radius:16px;padding:45px;display:grid;grid-template-columns:1.2fr repeat(3,1fr);gap:35px}.benefits h2{font-size:27px;line-height:1.3;letter-spacing:-.8px}.benefits h3{font-size:14px;margin-top:12px}.benefits p{font-size:12px;color:#adbed5}.benefits .icon{color:#9bbcff;font-size:26px}.faq{max-width:780px;margin:auto}details{border-bottom:1px solid var(--line);padding:19px 0;font-size:14px}summary{cursor:pointer;font-weight:600}details p{color:var(--muted);font-size:13px;padding-top:15px}.cta{background:#eaf1ff;padding:35px;border-radius:12px;display:flex;align-items:center;justify-content:space-between;gap:20px}.cta h2{margin-bottom:6px;font-size:26px}.cta p{margin:0;color:var(--muted);font-size:13px}footer{background:white;border-top:1px solid var(--line);padding:45px 5% 20px}.footer-top{max-width:1184px;margin:auto;display:grid;grid-template-columns:2fr 1fr 1fr 1.3fr;gap:40px}.footer-top p{font-size:12px;color:var(--muted);margin-top:18px}.footer-top strong{display:block;font-size:12px;margin-bottom:15px}.footer-top>div>a:not(.brand){display:block;color:var(--muted);font-size:12px;margin:8px 0}.footer-bottom{max-width:1184px;margin:30px auto 0;border-top:1px solid var(--line);padding-top:20px;display:flex;justify-content:space-between;gap:15px;color:var(--muted);font-size:10px}.page-heading{padding:45px 0 25px}.page-heading h1{font-size:40px;letter-spacing:-1.5px;margin:12px 0}.breadcrumb{font-size:12px;color:var(--muted)}.toolbar{display:flex;justify-content:space-between;align-items:center;gap:15px;margin-bottom:24px;color:var(--muted);font-size:12px}.toolbar select{padding:9px;background:white;border:1px solid var(--line);border-radius:6px;color:var(--navy)}.load-row{text-align:center;margin-top:32px}.notice{padding:14px 18px;background:#fff6e5;border:1px solid #f1dfb9;border-radius:7px;font-size:12px;color:#805b20;margin-bottom:24px}.detail-grid{display:grid;grid-template-columns:1fr 1fr;gap:55px}.detail-grid .cover{height:390px;border-radius:12px;padding:35px}.detail-grid .cover-title{font-size:48px;margin-top:60px}.detail-grid .cover-symbol{font-size:160px}.detail-grid h1{font-size:38px;letter-spacing:-1px}.detail-grid p,.prose p,.prose li{color:var(--muted);font-size:14px}.meta{display:flex;gap:12px;margin:20px 0;font-size:12px}.panel{background:white;border:1px solid var(--line);padding:28px;border-radius:12px;margin-bottom:24px}.narrow{max-width:740px;margin:auto}.form-grid{display:grid;gap:15px}label{font-size:13px;font-weight:600;display:block}label input,label textarea{display:block;width:100%;padding:11px 12px;border:1px solid #cbd5e1;border-radius:6px;margin-top:6px;background:white}textarea{min-height:110px}.disabled{opacity:.55;cursor:not-allowed}.checkout-grid{display:grid;grid-template-columns:1.1fr 1fr;gap:30px}.qr-placeholder{width:180px;height:180px;border:2px dashed #cbd5e1;background:#f1f5f9;display:grid;place-content:center;text-align:center;font-size:12px;color:var(--muted);margin:20px auto;padding:20px}dl{font-size:13px}dt{color:var(--muted);margin-top:15px}dd{margin:3px 0;overflow-wrap:anywhere}code{background:#edf2fa;padding:4px 7px;border-radius:4px}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.stats strong{display:block;font-size:29px}.table-wrap{overflow:auto}table{width:100%;border-collapse:collapse;font-size:12px}th,td{text-align:left;padding:14px;border-bottom:1px solid var(--line)}dialog{border:1px solid var(--line);border-radius:15px;padding:35px;max-width:650px;width:90%;color:var(--navy);max-height:85vh}dialog::backdrop{background:#101f3780;backdrop-filter:blur(4px)}.close{position:absolute;right:14px;top:9px;border:0;background:none;font-size:28px}.preview-paper{background:#f8fafc;border:1px solid var(--line);padding:25px;font-size:14px}.skip{position:fixed;top:-100px;left:10px;z-index:10;background:white;padding:12px}.skip:focus{top:10px}#toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);background:var(--navy);color:white;border-radius:8px;padding:12px 24px;font-size:13px;display:none;z-index:20}.empty{padding:50px;text-align:center;grid-column:1/-1;color:var(--muted)}
@media(min-width:1441px){header{max-width:none;padding-left:max(5%,calc((100vw - 1184px)/2));padding-right:max(5%,calc((100vw - 1184px)/2))}}@media(max-width:1100px){header{gap:20px;padding:20px 28px}nav{gap:14px}.header-actions>a:first-child{display:none}.grid{grid-template-columns:repeat(3,1fr)}h1{font-size:48px}.hero-grid{gap:20px}.benefits{grid-template-columns:repeat(2,1fr)}.category-grid{grid-template-columns:repeat(3,1fr)}}@media(max-width:800px){header{flex-wrap:wrap;gap:15px}.menu-toggle{display:block;margin-left:auto;border:1px solid var(--line);border-radius:5px;background:white;padding:5px 10px;font-size:20px}nav{display:none;order:4;flex-basis:100%;flex-wrap:wrap;padding-top:15px}nav.open{display:flex}.header-actions{margin-left:0}.hero-grid{grid-template-columns:1fr 1fr}.hero-art{transform:scale(.8);transform-origin:center;width:100%}h1{font-size:41px}.hero-note{flex-wrap:wrap;gap:7px}.hero-actions{flex-wrap:wrap}.trust-strip{gap:20px;flex-wrap:wrap}.grid{grid-template-columns:repeat(2,1fr)}.category-grid{grid-template-columns:repeat(2,1fr)}.detail-grid{gap:25px}.detail-grid .cover-title{font-size:36px}.checkout-grid{grid-template-columns:1fr}.footer-top{grid-template-columns:repeat(2,1fr)}.footer-bottom{flex-wrap:wrap}.section{padding:45px 0}}@media(max-width:560px){.announcement{font-size:10px}.announcement a{display:block;margin:3px 0 0}header{padding:17px 20px}.brand{font-size:20px}.brand-mark{width:36px;height:38px;font-size:24px}.brand-sub{font-size:8px}.header-actions{gap:7px}.header-actions .button{font-size:10px;padding:8px}.wrap{padding:0 20px}.hero{padding:40px 0 25px}.hero-grid{grid-template-columns:1fr;gap:0}h1{font-size:44px;letter-spacing:-2px}.hero-art{height:340px;transform:scale(.85);margin-top:5px}.hero p{font-size:14px}.trust-strip{gap:9px 20px;font-size:10px;padding:17px}.grid{gap:13px}.cover{height:155px;padding:14px}.cover-title{font-size:19px;margin-top:22px}.cover-symbol{font-size:60px}.cover-label{font-size:6px}.card-body{padding:13px}.card h3{font-size:13px;min-height:38px}.card p{font-size:10px;min-height:48px}.tag-row{font-size:8px;flex-wrap:wrap}.card-bottom{font-size:11px}.card-bottom button{font-size:10px}.section-head h2{font-size:24px}.section-head p{font-size:12px}.text-link{font-size:11px;white-space:nowrap}.category-tile{padding:12px;font-size:10px;gap:8px}.category-tile span{font-size:20px;min-width:30px;width:30px;height:30px;line-height:30px}.benefits{padding:26px;gap:20px;grid-template-columns:1fr}.benefits h2{font-size:25px}.benefits h3{margin:5px 0}.benefits p{margin-bottom:0}.cta{align-items:start;flex-direction:column;padding:25px}.cta h2{font-size:24px}.footer-top{gap:25px}.footer-top .brand{font-size:19px}.footer-bottom{font-size:9px}.detail-grid{grid-template-columns:1fr}.detail-grid .cover{height:300px}.detail-grid .cover-title{margin-top:35px}.page-heading h1{font-size:32px}.toolbar{flex-wrap:wrap}.panel{padding:20px}.stats{gap:8px}.stats .panel{padding:12px;font-size:10px}.stats strong{font-size:22px}.search-bar .button{padding:10px 13px}.notice{font-size:11px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
/* Language picker: one control for desktop and mobile, retaining brand colors. */
.language{max-width:150px;border:1px solid var(--line);border-radius:6px;background:white;color:var(--navy);font-size:12px;cursor:pointer;padding:8px 5px;min-height:36px}
html[lang="vi"] .cover-title{font-size:21px;line-height:1.2;letter-spacing:-.5px;margin-top:18px}
html[lang="vi"] .detail-grid .cover-title{font-size:40px;line-height:1.25;margin-top:48px}
.card h3,.card p{height:auto;overflow-wrap:break-word}
.header-actions{flex-shrink:0}
@media(max-width:1250px) and (min-width:801px){header{flex-wrap:wrap;gap:16px}header nav{order:4;flex-basis:100%;justify-content:center;padding-top:6px}.header-actions{margin-left:auto}}
@media(max-width:800px){header .header-actions{margin-left:0}html[lang="vi"] nav{gap:12px 18px}html[lang="vi"] .hero-art{transform:scale(.72)}.hero-grid>div{min-width:0}.header-actions{flex-wrap:wrap}}
@media(max-width:560px){header{gap:12px}.header-actions{flex-basis:100%;justify-content:flex-end;gap:12px}.language{font-size:12px;max-width:150px}html[lang="vi"] .cover{height:190px}html[lang="vi"] .cover-title{font-size:17px;line-height:1.2;margin-top:19px}html[lang="vi"] .cover-label{font-size:6px;letter-spacing:.6px}html[lang="vi"] .detail-grid .cover{height:330px}html[lang="vi"] .detail-grid .cover-title{font-size:30px;margin-top:35px}html[lang="vi"] .hero-art{transform:scale(.80)}html[lang="vi"] .art-book h2{font-size:24px}html[lang="vi"] .section-head{align-items:start;flex-wrap:wrap}.toolbar select{max-width:100%}.category-tile{min-width:0}html[lang="vi"] .hero-note{font-size:10px}.card-bottom{gap:6px;flex-wrap:wrap}.search-bar{gap:5px}.search-bar input{font-size:12px}.search-bar .button{font-size:12px;padding:10px}}