:root{--at-bg:#0b0f17;--at-bg2:#101623;--at-card:#141b2b;--at-line:#232d42;--at-tx:#eef2fa;--at-mt:#8f9ab2;--at-pr:#ff5a1f;--at-tl:#19d3c5;--at-w:1240px}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--at-bg);color:var(--at-tx);font:16.5px/1.75 'Lexend',system-ui,sans-serif}
a{color:inherit;text-decoration:none}img{max-width:100%;display:block}
h1,h2,h3,h4{font-family:'Saira Condensed','Arial Narrow',sans-serif;font-weight:700;line-height:1.08;margin:0;letter-spacing:.01em}
.wrap{max-width:var(--at-w);margin:0 auto;padding:0 22px}
.at-skew{transform:skewX(-10deg)}.at-skew>*{transform:skewX(10deg)}
.at-chip{display:inline-block;font:700 12px/1 'Saira Condensed',sans-serif;letter-spacing:.14em;text-transform:uppercase;background:var(--c,var(--at-pr));color:#0b0f17;padding:6px 10px;transform:skewX(-10deg)}
.at-chip span{display:inline-block;transform:skewX(10deg)}
.at-meta{font:600 13px/1.3 'Saira Condensed',sans-serif;letter-spacing:.08em;text-transform:uppercase;color:var(--at-mt)}
/* header */
.at-hd{background:linear-gradient(90deg,#0b0f17,#131a2a);border-bottom:2px solid var(--at-pr)}
.at-hd .wrap{display:flex;align-items:center;justify-content:space-between;gap:20px;min-height:70px}
.at-logo{display:flex;align-items:center;gap:12px}.at-logo img{width:42px;height:42px}
.at-logo b{font:800 26px/1 'Saira Condensed',sans-serif;letter-spacing:.04em;text-transform:uppercase}.at-logo b em{font-style:normal;color:var(--at-pr)}
.at-logo small{display:block;font:500 11px/1 'Lexend',sans-serif;letter-spacing:.14em;text-transform:uppercase;color:var(--at-mt);margin-top:5px}
.at-nav{display:flex;gap:4px;overflow-x:auto;scrollbar-width:none}
.at-nav a{font:700 15px/1 'Saira Condensed',sans-serif;letter-spacing:.08em;text-transform:uppercase;color:#c9d1e3;padding:12px 14px;white-space:nowrap;position:relative}
.at-nav a:after{content:"";position:absolute;left:14px;right:14px;bottom:4px;height:3px;background:var(--c,var(--at-pr));transform:scaleX(0);transition:.2s}
.at-nav a:hover:after,.at-nav a[aria-current]:after{transform:scaleX(1)}
/* bảng điểm chuyên mục */
.at-board{background:var(--at-bg2);border-bottom:1px solid var(--at-line)}
.at-board .wrap{display:flex;gap:0;overflow-x:auto;scrollbar-width:none}
.at-board a{display:flex;align-items:center;gap:10px;padding:12px 20px;border-right:1px solid var(--at-line);white-space:nowrap;font:600 14px/1 'Saira Condensed',sans-serif;letter-spacing:.06em;text-transform:uppercase}
.at-board a b{font:800 22px/1 'Saira Condensed',sans-serif;color:var(--c)}
.at-board a:hover{background:var(--at-card)}
/* bìa */
.at-cov{position:relative;overflow:hidden;aspect-ratio:16/9;background:linear-gradient(115deg,var(--at-card) 0 52%,color-mix(in srgb,var(--c) 30%,var(--at-card)) 52% 60%,var(--at-bg2) 60%)}
.at-cov:before{content:"";position:absolute;inset:0;background:repeating-linear-gradient(115deg,transparent 0 18px,rgba(255,255,255,.035) 18px 19px)}
.at-cov b{position:absolute;right:6%;bottom:8%;font:800 clamp(46px,7vw,92px)/1 'Saira Condensed',sans-serif;color:transparent;-webkit-text-stroke:2px var(--c);letter-spacing:.04em}
.at-cov i{position:absolute;left:6%;top:12%;font:italic 800 18px/1 'Saira Condensed',sans-serif;color:var(--c);letter-spacing:.1em}
/* trận tâm điểm */
.at-hero{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr);gap:0;margin:30px auto 0;background:var(--at-card);border:1px solid var(--at-line)}
.at-hero .in{padding:34px 34px 30px;display:flex;flex-direction:column;justify-content:center}
.at-hero h2{font-size:clamp(34px,4vw,52px);text-transform:uppercase;margin:16px 0 14px}
.at-hero h2 a:hover,.at-card h3 a:hover,.at-fix h3 a:hover{color:var(--c,var(--at-pr))}
.at-hero p{color:#b8c1d6;margin:0 0 20px}
.at-hero .at-cov{aspect-ratio:auto;height:100%;min-height:300px}
.at-vs{display:flex;align-items:center;gap:12px;margin-top:6px}
.at-btn{display:inline-block;background:var(--at-pr);color:#0b0f17;font:800 15px/1 'Saira Condensed',sans-serif;letter-spacing:.12em;text-transform:uppercase;padding:14px 24px;transform:skewX(-10deg)}
.at-btn span{display:inline-block;transform:skewX(10deg)}.at-btn:hover{background:#ff7a47}
/* lịch bài */
.at-sec{display:flex;align-items:center;gap:14px;margin:52px 0 18px}
.at-sec h2{font-size:30px;text-transform:uppercase;letter-spacing:.04em}
.at-sec:after{content:"";flex:1;height:2px;background:linear-gradient(90deg,var(--c,var(--at-pr)),transparent)}
.at-sec a{order:2;font:700 14px/1 'Saira Condensed',sans-serif;letter-spacing:.1em;text-transform:uppercase;color:var(--c,var(--at-pr))}
.at-fix{display:grid;grid-template-columns:90px 150px minmax(0,1fr) 90px;gap:18px;align-items:center;padding:16px 18px;background:var(--at-card);border-left:4px solid var(--c);margin-bottom:8px}
.at-fix .d{font:800 22px/1 'Saira Condensed',sans-serif;text-align:center}.at-fix .d small{display:block;font-size:12px;color:var(--at-mt);letter-spacing:.1em;margin-top:4px}
.at-fix h3{font-size:21px;line-height:1.2}.at-fix .r{font:700 13px/1 'Saira Condensed',sans-serif;letter-spacing:.1em;color:var(--at-tl);text-align:right}
.at-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(270px,1fr));gap:20px}
.at-card{background:var(--at-card);border:1px solid var(--at-line);transition:transform .2s,border-color .2s}
.at-card:hover{transform:translateY(-3px);border-color:var(--c)}
.at-card .in{padding:16px 18px 20px}.at-card h3{font-size:22px;line-height:1.15;margin:12px 0 8px}
.at-card p{color:var(--at-mt);font-size:14.5px;line-height:1.6;margin:0 0 10px;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.at-main{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:36px;margin:0 auto 70px}
.at-side .box{background:var(--at-card);border:1px solid var(--at-line);padding:20px;margin-bottom:22px}
.at-side h3{font-size:20px;text-transform:uppercase;letter-spacing:.08em;margin-bottom:12px;color:var(--at-pr)}
.at-side ol{list-style:none;margin:0;padding:0;counter-reset:k}
.at-side ol li{counter-increment:k;display:grid;grid-template-columns:40px 1fr;padding:10px 0;border-top:1px solid var(--at-line);font-size:14.5px;line-height:1.4}
.at-side ol li:first-child{border-top:0}
.at-side ol li:before{content:"#" counter(k);font:800 18px/1.2 'Saira Condensed',sans-serif;color:var(--at-tl)}
.at-side .rule{font-size:14px;color:#b8c1d6;line-height:1.6}
/* chuyên mục */
.at-band{background:linear-gradient(115deg,var(--at-bg2) 0 60%,color-mix(in srgb,var(--c) 22%,var(--at-bg2)) 60%);border-bottom:2px solid var(--c)}
.at-band .wrap{padding-top:46px;padding-bottom:40px}
.at-band h1{font-size:clamp(40px,6vw,72px);text-transform:uppercase;margin:12px 0 10px}
.at-band p{color:#b8c1d6;max-width:640px;margin:0}
.at-pg{display:flex;gap:8px;margin:26px 0}.at-pg a,.at-pg span{min-width:42px;height:42px;display:grid;place-items:center;background:var(--at-card);border:1px solid var(--at-line);font:700 16px/1 'Saira Condensed',sans-serif}.at-pg span{background:var(--at-pr);color:#0b0f17}
/* bài viết */
.at-ah{background:linear-gradient(115deg,var(--at-bg2) 0 62%,color-mix(in srgb,var(--c) 18%,var(--at-bg2)) 62%);border-bottom:1px solid var(--at-line)}
.at-ah .wrap{padding-top:40px;padding-bottom:36px}
.at-ah h1{font-size:clamp(34px,4.6vw,56px);text-transform:uppercase;margin:16px 0 14px;max-width:960px}
.at-dek{font-size:18px;color:#b8c1d6;max-width:820px;margin:0 0 22px}
.at-score{display:flex;flex-wrap:wrap;gap:0;border:1px solid var(--at-line);width:max-content;max-width:100%}
.at-score div{padding:10px 18px;border-right:1px solid var(--at-line)}.at-score div:last-child{border-right:0}
.at-score small{display:block;font:600 11px/1 'Saira Condensed',sans-serif;letter-spacing:.14em;text-transform:uppercase;color:var(--at-mt);margin-bottom:5px}
.at-score b{font:700 17px/1 'Saira Condensed',sans-serif;letter-spacing:.04em}
.at-read{display:grid;grid-template-columns:minmax(0,740px) 260px;gap:48px;justify-content:center;margin:40px auto 60px}
.at-toc{position:sticky;top:20px;align-self:start;background:var(--at-card);border:1px solid var(--at-line);border-top:3px solid var(--c);padding:16px 18px}
.at-toc b{display:block;font:700 14px/1 'Saira Condensed',sans-serif;letter-spacing:.14em;text-transform:uppercase;margin-bottom:10px;color:var(--c)}
.at-toc ol{margin:0;padding-left:20px;font-size:13.5px;line-height:1.45;color:#c9d1e3}.at-toc li{margin:7px 0}.at-toc a:hover{color:var(--at-pr)}
.at-body{font-size:17.5px;line-height:1.85;color:#d9dfec}
.at-body p{margin:0 0 1.15em}.at-body a{color:var(--at-tl);border-bottom:1px solid rgba(25,211,197,.4)}.at-body a:hover{color:var(--at-pr);border-color:var(--at-pr)}
.at-body h2{font-size:32px;text-transform:uppercase;margin:1.8em 0 .6em;color:#fff;display:flex;gap:12px;align-items:center}
.at-body h2:before{content:"";width:10px;height:28px;background:var(--c);transform:skewX(-14deg);flex:none}
.at-body h3{font-size:24px;margin:1.4em 0 .4em;color:#fff}.at-body strong{color:#fff}
.at-body li::marker{color:var(--at-pr)}
.at-body blockquote{margin:1.6em 0;padding:14px 20px;background:var(--at-card);border-left:4px solid var(--at-tl)}
.at-body table{border-collapse:collapse;width:100%;margin:1.4em 0;font-size:15px;display:block;overflow-x:auto;background:var(--at-card)}
.at-body th,.at-body td{border:1px solid var(--at-line);padding:10px 12px;text-align:left;vertical-align:top}.at-body th{font-family:'Saira Condensed',sans-serif;text-transform:uppercase;letter-spacing:.08em;color:var(--at-pr)}
.at-faq{margin-top:2.4em}.at-faq details{background:var(--at-card);border:1px solid var(--at-line);padding:14px 18px;margin-bottom:8px}
.at-faq summary{cursor:pointer;font:700 19px/1.3 'Saira Condensed',sans-serif;letter-spacing:.02em;color:#fff}.at-faq details[open]{border-color:var(--at-pr)}
.at-faq details p{margin:10px 0 0;color:#b8c1d6;font-size:16px}
.at-gg{margin-top:34px;padding:18px 20px;background:var(--at-card);border:1px solid var(--at-line);display:flex;gap:14px;align-items:center;font-size:14.5px;color:var(--at-mt)}.at-gg img{width:42px;height:42px}.at-gg b{color:#fff;font:700 17px/1.3 'Saira Condensed',sans-serif;display:block}
.at-page{max-width:760px;margin:46px auto 70px;padding:0 22px}.at-page h1{font-size:54px;text-transform:uppercase;margin:12px 0 20px}
.notfound{text-align:center;padding:110px 22px}.notfound h1{font-size:72px;text-transform:uppercase;color:var(--at-pr)}.notfound .btn{display:inline-block;margin-top:14px;padding:13px 22px;background:var(--at-pr);color:#0b0f17;font:800 15px/1 'Saira Condensed',sans-serif;letter-spacing:.12em;text-transform:uppercase}
.at-ft{background:#070a10;border-top:2px solid var(--at-pr);padding:46px 0 24px;color:var(--at-mt);font-size:14.5px}
.at-ft .cols{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:36px;padding-bottom:26px;border-bottom:1px solid var(--at-line)}
.at-ft h4{font:700 15px/1 'Saira Condensed',sans-serif;letter-spacing:.14em;text-transform:uppercase;color:#fff;margin:0 0 14px}
.at-ft ul{list-style:none;margin:0;padding:0}.at-ft li{margin:0 0 9px}.at-ft a:hover{color:var(--at-pr)}
.at-ft .bot{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;padding-top:16px;font:600 13px/1 'Saira Condensed',sans-serif;letter-spacing:.12em;text-transform:uppercase}
@media(max-width:1000px){.at-hero{grid-template-columns:1fr}.at-hero .at-cov{min-height:200px;order:-1}.at-main{grid-template-columns:1fr}.at-read{grid-template-columns:1fr;gap:22px}.at-toc{position:static;order:-1}.at-ft .cols{grid-template-columns:1fr 1fr}}
@media(max-width:640px){body{font-size:16px}.wrap{padding:0 16px}.at-hd .wrap{flex-direction:column;align-items:stretch;gap:4px;padding-top:12px}.at-logo b{font-size:22px}.at-nav a{padding:10px 10px;font-size:14px}.at-hero .in{padding:22px}
.at-fix{grid-template-columns:60px minmax(0,1fr);gap:12px}.at-fix .t,.at-fix .r{display:none}.at-body{font-size:16.5px}.at-body h2{font-size:26px}.at-ft .cols{grid-template-columns:1fr}}