/* Học viện — kiểu trang chủ "Khóa học online" (23/10/2026). CSS tự viết, dựng lại bố cục/tỉ lệ/màu của trang mẫu Echooling "Online Course"
   (không chép mã/ảnh/icon/phông của mẫu). Nạp sau academy.css khi kiểu này đang bật; lớp riêng tiền tố .on- */
.ac-home-online{--on-red:#D2093C;--on-navy:#00306E;--on-bg:#F3F4F9;--on-grey:#F5F5F5;--on-text:#4b4f58;--on-line:#e6e8ee;--on-shadow:0 12px 36px rgba(15,18,22,.08);--wrap:1340px}
.on-wrap{max-width:1340px;margin:0 auto;padding:0 22px}
.on-wrap--narrow{max-width:1220px}
.on-sec{padding:110px 0}
.ac .on-h2{font-size:clamp(30px,3.1vw,44px);line-height:1.2273;font-weight:700;color:var(--ink);margin:0 0 14px}
.on-eyebrow{display:block;color:var(--on-red);font-weight:600;font-size:16px;line-height:20px;margin:0}
.on-shead{text-align:center;max-width:780px;margin:0 auto 40px}
.on-shead .on-h2{margin:0}
.on-center{text-align:center;margin-top:44px}
.on-empty{text-align:center;color:#8b9099;background:#fff;border:1px dashed var(--on-line);border-radius:8px;padding:22px;margin:0}
.on-link{color:var(--ac);font-weight:700;display:inline-flex;align-items:center;gap:6px}
.on-link:hover{text-decoration:underline}
.on-arr{width:16px;height:16px;flex:none;transition:transform .2s}
.on-btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:56px;padding:16px 35px;border-radius:6px;background:var(--ac);color:#fff!important;font-weight:600;font-size:16px;border:0;transition:background .2s,box-shadow .2s,color .2s;font-family:inherit;cursor:pointer;line-height:20px}
.on-btn:hover{background:var(--ac-d);border-color:var(--ac-d);box-shadow:0 10px 22px var(--ac-s)}
.on-btn:hover .on-arr{transform:translateX(3px)}
.on-btn--sm{min-height:44px;padding:10px 26px;font-size:16px}
.on-btn--line{background:transparent;color:var(--on-navy)!important;border:2px solid rgba(0,48,110,.1);min-height:52px;padding:12px 35px}
.on-btn--line:hover{background:var(--ac);border-color:var(--ac);color:#fff!important}
.on-btn--ghost{background:transparent;color:var(--on-navy)!important;border:2px solid rgba(0,48,110,.1);min-height:52px;padding:12px 35px}
.on-btn--ghost:hover{background:var(--ac);border-color:var(--ac);color:#fff!important}
.on-btn--white{background:transparent;border:2px solid rgba(255,255,255,.2);color:#fff!important;min-height:55px;padding:15px 35px 12px}
.on-btn--white:hover{background:#fff;border-color:#fff;color:var(--on-red)!important;box-shadow:none}
.on-tag{position:absolute;right:22px;top:20px;background:var(--ac);color:#fff;font-size:14px;font-weight:600;padding:4px 9px 7px;border-radius:4px;line-height:17px}
.on-ava{display:inline-grid;place-items:center;width:30px;height:30px;border-radius:50%;flex:none;color:#fff;font-size:11px;font-weight:800;background:hsl(var(--h) 55% 52%)}
[data-ac-cat][hidden]{display:none!important}

/* ---------- đầu trang ---------- */
.on-head{position:sticky;top:0;z-index:40;background:#fff;box-shadow:0 4px 10px rgba(0,14,32,.06)}
.on-head__in{display:flex;align-items:center;gap:20px;min-height:91px}
.on-logo{font-size:22px}
.on-logo img{height:46px;max-width:170px}
.on-nav{display:flex;gap:2px;margin-left:auto}
.on-nav a{padding:10px 14px;font-weight:600;font-size:16px;line-height:27px;color:var(--on-navy);border-radius:4px;white-space:nowrap}
.on-nav a:hover,.on-nav a.is-on{color:var(--ac)}
.on-nav__login{display:none}
.on-head__act{display:flex;align-items:center;gap:14px}
.on-head__phone{display:flex;align-items:center;gap:8px;font-weight:600;font-size:18px;line-height:24px;color:#0f1216;white-space:nowrap;padding-left:25px;border-left:1px solid var(--on-line);min-height:27px}
.on-head__phone span{color:#0f1216}
.on-head__cta{min-height:44px;padding:10px 26px;border-radius:6px;font-weight:600}
.on-head__phone svg{width:24px;height:24px;color:var(--ac)}
.on-head__login{display:grid;place-items:center;width:44px;height:44px;border-radius:50%;color:var(--on-navy);background:var(--on-bg)}
.on-head__login svg{width:22px;height:22px}
.on-head__login:hover{color:#fff;background:var(--ac)}
.on-burger{display:none;width:44px;height:44px;border:1px solid var(--on-line);border-radius:6px;background:#fff;cursor:pointer;flex-direction:column;justify-content:center;align-items:center;gap:4px}
.on-burger i{display:block;width:20px;height:2px;background:var(--ink);border-radius:2px}

/* ---------- đầu trang chủ ---------- */
.on-hero{position:relative;overflow:hidden;background:var(--on-bg);min-height:890px;display:block;padding:160px 0 180px}
.on-hero__in{position:relative;z-index:2;text-align:center;width:100%;max-width:1100px;padding-top:0;padding-bottom:0}
.on-hero h1{font-size:clamp(38px,4.6vw,66px);line-height:1.121;font-weight:600;color:#0f1216;margin:0 0 40px}
.on-hero h1 em{position:relative;display:table;margin:0 auto;color:var(--ac);padding-bottom:30px}
.on-hero h1 em::after{content:"";position:absolute;left:0;right:0;bottom:0;height:30px;background:currentColor;-webkit-mask:no-repeat center/100% 100% url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 320 22' preserveAspectRatio='none'%3E%3Cpath d='M3 16C70 1 200-2 317 19' fill='none' stroke='%23000' stroke-width='3' stroke-linecap='round'/%3E%3C/svg%3E");mask:no-repeat center/100% 100% url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 320 22' preserveAspectRatio='none'%3E%3Cpath d='M3 16C70 1 200-2 317 19' fill='none' stroke='%23000' stroke-width='3' stroke-linecap='round'/%3E%3C/svg%3E")}
.on-search{display:flex;align-items:center;max-width:570px;margin:0 auto;background:#fff;border-left:3px solid var(--ac);box-shadow:0 20px 20px rgba(0,14,32,.1)}
.on-search input{flex:1;min-width:0;height:58px;border:0;padding:0 26px;font:inherit;font-size:16px;color:var(--ink);background:transparent;outline:0}
.on-search input::placeholder{color:#7d828b}
.on-search button{width:62px;height:58px;border:0;background:none;color:var(--ink);cursor:pointer;display:grid;place-items:center}
.on-search button svg{width:23px;height:23px}
.on-search:focus-within{box-shadow:0 14px 34px rgba(15,18,22,.09),0 0 0 2px var(--ac-s)}
.on-hero__ask{margin:25px 0 0;font-size:16px;line-height:20px;color:var(--on-navy)}
.on-hero__ask a{color:var(--ac);display:inline-flex;align-items:center;gap:5px}
.on-hero__ask a:hover{text-decoration:underline}
.on-hero__stats{display:grid;grid-template-columns:325px 1fr;gap:0;max-width:640px;margin:60px auto 0;padding-top:30px;text-align:left;background:linear-gradient(90deg,transparent 50%,#ededed 50%) top/100% 1px no-repeat}
.on-hero__stats:has(.on-hero__stat:only-child){grid-template-columns:1fr;max-width:330px;margin-left:auto;margin-right:auto}
.on-hero__stat{display:flex;gap:27px;align-items:flex-start;padding:0 28px}
.on-hero__sic{flex:none;width:60px;height:60px;border-radius:50%;background:#fff;box-shadow:0 8px 20px rgba(15,18,22,.07);display:grid;place-items:center;color:#f6a33b}
.on-hero__sic svg{width:26px;height:26px}
.on-hero__stat b{display:block;font-size:40px;line-height:50px;font-weight:700;color:var(--on-navy);margin:0 0 14px}
.on-hero__stat small{display:block;font-size:16px;line-height:22px;color:#5b5f64}
/* trang trí */
.on-hero__ring{position:absolute;border-radius:50%;pointer-events:none;z-index:0}
.on-hero__ring--a{width:186px;height:186px;left:calc(50% - 618px);top:254px;border:2px solid #f3bfd2}
.on-hero__ring--b{width:760px;height:760px;left:calc(50% - 1150px);top:385px;border:1.5px solid #bcdcdc}
.on-hero__card{position:absolute;z-index:1;left:calc(50% - 595px);top:432px;width:270px;padding:40px 20px 38px;background:#fff;border-radius:6px;box-shadow:0 20px 50px rgba(15,18,22,.08);text-align:center}
.on-hero__cardic{display:grid;place-items:center;width:78px;height:78px;margin:0 auto 14px;border-radius:50%;border:1.5px solid #d6ebe2;color:#0f8a62}
.on-hero__cardic svg{width:36px;height:36px}
.on-hero__card b{display:block;font-size:48px;line-height:1.1;font-weight:700;color:var(--ink)}
.on-hero__card small{display:block;font-size:17px;color:var(--on-text);margin-top:4px}
.on-hero__faces{display:flex;justify-content:center;margin-top:34px}
.on-hero__faces img{width:36px;height:36px;border-radius:50%;object-fit:cover;border:2px solid #fff;margin-left:-11px;box-shadow:0 2px 6px rgba(0,0,0,.08)}
.on-hero__faces img:first-child{margin-left:0}
.on-hero__chip{position:absolute;z-index:2;left:calc(50% - 660px);top:247px;width:200px;display:flex;gap:12px;align-items:center;background:#fff;border-radius:6px;padding:8px 14px 8px 8px;box-shadow:0 16px 36px rgba(15,18,22,.09)}
.on-hero__chip>span{flex:none;width:44px;height:44px;border-radius:6px;display:grid;place-items:center;background:var(--ac-s);color:var(--ac)}
.on-hero__chip svg{width:24px;height:24px}
.on-hero__chip b{display:block;font-size:20px;line-height:1.1;color:var(--ink)}
.on-hero__chip small{display:block;font-size:14px;color:var(--on-text);line-height:1.3}
.on-hero__pic{position:absolute;z-index:1;left:calc(50% + 452px);top:212px;width:300px;height:300px}
.on-hero__pic img{width:100%;height:100%;object-fit:cover;border-radius:50%;border:7px solid #fff;box-shadow:0 18px 44px rgba(15,18,22,.1)}
.on-hero__list{position:absolute;left:150px;top:228px;width:260px;margin:0;padding:22px 24px;list-style:none;background:#fff;border-radius:4px;box-shadow:0 18px 40px rgba(15,18,22,.1);display:grid;gap:12px}
.on-hero__list li{position:relative;padding-left:20px;font-size:15px;font-weight:600;color:var(--ink);line-height:1.35}
.on-hero__list li::before{content:"";position:absolute;left:2px;top:6px;width:7px;height:7px;border-radius:50%;background:var(--on-red)}
.on-hero__dot{position:absolute;z-index:1;left:calc(50% + 342px);top:518px;width:74px;height:74px;border-radius:50%;border:4px solid #fff;box-shadow:0 10px 26px rgba(15,18,22,.12);overflow:hidden;background:#fff}
.on-hero__dot img{width:100%;height:100%;object-fit:cover}
.on-hero__dash{position:absolute;z-index:0;left:calc(50% + 700px);top:180px;width:60px;height:90px;background:repeating-linear-gradient(-55deg,#f6a33b 0 4px,transparent 4px 14px);opacity:.85;border-radius:8px}

/* ---------- chủ đề ---------- */
.on-topics{padding:120px 0 150px}
.on-topics__head{display:flex;justify-content:space-between;align-items:flex-end;gap:30px;margin-bottom:60px}
.on-topics__head .on-h2{max-width:776px;margin:0}
.on-topics__head .on-btn{flex:none;margin-right:12px}
.on-topics__grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:24px}
.on-topics__grid.is-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.on-topic{display:block;background:#fff;border:2px solid rgba(15,22,41,.08);border-radius:6px;padding:40px 35px 35px;transition:box-shadow .25s,border-color .25s,transform .25s}
.on-topic:hover{border-color:transparent;box-shadow:var(--on-shadow);transform:translateY(-4px)}
.on-topic__ic{display:grid;place-items:center;width:80px;height:80px;border-radius:50%;border:1.5px solid #ececef;color:var(--ac);margin-bottom:25px;transition:background .25s,color .25s}
.on-topic:hover .on-topic__ic{background:var(--ac);color:#fff;border-color:var(--ac)}
.on-topic__ic svg{width:34px;height:34px}
.on-topic b{display:block;font-size:20px;font-weight:600;color:var(--on-navy);line-height:26px}
.on-topic small{display:block;font-size:16px;color:#5b5f64;margin-top:0;line-height:20px}

/* ---------- giới thiệu ---------- */
.on-about{padding:0 0 120px}
.on-about__in{display:grid;grid-template-columns:minmax(0,636px) minmax(0,1fr);gap:24px;align-items:start}
.on-about__media{position:relative;padding:0 96px 30px 0}
.on-about__img{position:relative;z-index:1;border-radius:6px;overflow:hidden;aspect-ratio:540/400;background:#ddd}
.on-about__img img{width:100%;height:100%;object-fit:cover}
.on-about__block{position:absolute;z-index:0;left:32.4%;bottom:0;width:58.2%;height:37.2%;background:#00835B;border-radius:6px}
.on-about__dots{position:absolute;z-index:0;left:-22px;top:-23px;width:60px;height:97px;background:radial-gradient(circle,#f6a33b 1.6px,transparent 2.2px) 0 0/13px 13px}
.on-about__ring{position:absolute;z-index:2;left:-51px;top:36%;width:76px;height:76px;border-radius:50%;border:5px solid #409DE2}
.on-play{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);width:72px;height:50px;border-radius:12px;background:#f00;color:#fff;display:grid;place-items:center;box-shadow:0 10px 24px rgba(0,0,0,.25);transition:transform .2s}
.on-play:hover{transform:translate(-50%,-50%) scale(1.08)}
.on-play svg{width:30px;height:30px}
.on-about__text{position:relative;padding-top:0;max-width:636px}
.on-about__frame{position:absolute;left:-91px;top:33px;width:80px;height:40px;border:3px solid #E0557F;border-radius:4px}
.ac .on-about__title{margin-bottom:26px;line-height:56px}
.on-about__text>p{font-size:18px;line-height:28px;margin:0 0 26px}
.on-checks{list-style:none;padding:0;margin:0 0 15px;display:grid;gap:15px}
.on-checks li{position:relative;padding-left:50px;color:#0f1216;font-weight:600;font-size:16px;line-height:27px;min-height:32px;display:flex;align-items:center}
.on-checks li::before{content:"";position:absolute;left:5px;top:0;width:32px;height:32px;border-radius:50%;background:rgba(210,9,60,.1)}
.on-checks li::after{content:"";position:absolute;left:17px;top:9px;width:6px;height:11px;border:solid var(--on-red);border-width:0 2px 2px 0;transform:rotate(42deg)}
.on-about__text>.on-btn{margin-top:30px}

/* ---------- khóa học ---------- */
.on-cf{background:var(--on-grey)}
.on-cf__in{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:0 30px}
.on-cf{padding:120px 0 100px}
.on-cf__head{flex:1 1 420px;margin-bottom:30px}
.on-cf__head .on-h2{margin-bottom:15px;line-height:56px}
.on-cf__head p{margin:0;font-size:18px;line-height:22px}
.on-tabs{display:flex;flex-wrap:wrap;gap:18px;margin-bottom:65px}
.on-tabs button{min-width:104px;min-height:37px;padding:4px 30px 6px;border:0;border-radius:6px;background:#fff;box-shadow:0 1px 2px rgba(0,14,32,.1);font:inherit;font-size:16px;line-height:27px;color:#5b5f64;cursor:pointer;transition:background .2s,color .2s}
.on-tabs button.is-on,.on-tabs button:hover{background:var(--ac);color:#fff}
.on-cf__grid{flex:1 1 100%;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:50px 24px}
.on-cf .on-center{flex:1 1 100%;margin-top:50px}
.on-course{background:#fff;border-radius:10px;overflow:hidden;display:flex;flex-direction:column;transition:box-shadow .25s,transform .25s}
.on-course:hover{box-shadow:var(--on-shadow);transform:translateY(-5px)}
.on-course__img{position:relative;display:block;aspect-ratio:416/247;overflow:hidden;background:#e9eaee}
.on-course__img img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.on-course:hover .on-course__img img{transform:scale(1.05)}
.on-course__body{padding:30px 38px 20px 35px;display:flex;flex-direction:column;flex:1}
.on-course__meta{display:flex;flex-wrap:wrap;gap:4px 30px;font-size:16px;line-height:27px;color:#5b5f64;margin-bottom:7px}
.on-course__meta span{display:inline-flex;align-items:center;gap:7px}
.on-course__meta svg{width:18px;height:18px}
.on-course h3{font-size:18px;line-height:21.6px;font-weight:600;color:#0f1216;margin:0 0 18px;min-height:43px}
.on-course h3 a:hover{color:var(--ac)}
.on-course__teacher{display:flex;align-items:center;gap:12px;font-size:16px;color:#5b5f64;margin-bottom:0;min-width:0;min-height:30px}
.on-course__teacher span:last-child{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.on-course__foot{margin-top:auto;padding-top:14px;border-top:1px solid #eee;display:flex;justify-content:space-between;align-items:center;gap:12px}
.on-course__teacher+.on-course__foot{margin-top:20px}
.on-course__foot a{display:inline-flex;align-items:center;gap:8px;font-size:16px;line-height:27px;color:#5b5f64}
.on-course__foot a:hover{color:var(--ac)}
.on-course__foot svg{width:19px;height:19px}
.on-course__foot b{font-size:20px;line-height:34px;font-weight:600;color:#0f1216;white-space:nowrap}
.on-course__foot del{color:#9a9ea6;font-weight:400;font-size:14px;margin-left:6px}

/* ---------- hỏi đáp ---------- */
.on-faq{padding:110px 0 10px}
.on-faq__in{position:relative;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,636px);gap:24px;align-items:start}
.on-faq__text{position:relative;padding-top:0}
.on-faq__text .on-h2{max-width:420px;margin-bottom:10px}
.on-faq__text p{font-size:16px;line-height:26px;max-width:420px;margin:0 0 36px}
.on-faq__dots{display:block;width:14px;height:90px;margin:-2px 0 0 26px;background:radial-gradient(circle,#2e8bb0 1.5px,transparent 2px) 0 0/14px 13px}
.on-faq__ring{position:absolute;left:calc(50% - 158px);top:439px;width:44px;height:44px;border-radius:50%;border:3px solid #409DE2}
.on-acc{display:grid;gap:10px}
.on-acc__it{background:#fff;border-radius:6px;box-shadow:0 20px 40px rgba(15,18,22,.1)}
.on-acc__it button{width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:20px 37px;min-height:62px;background:none;border:0;font:inherit;font-weight:600;font-size:18px;line-height:21.6px;color:#020334;text-align:left;cursor:pointer}
.on-acc__it button svg{flex:none;width:16px;height:16px;transform:rotate(180deg);transition:transform .2s}
.on-acc__it.is-open button{color:var(--ac);font-size:20px;line-height:24px;min-height:64px}
.on-acc__it.is-open button svg{transform:none}
.on-acc__body{display:none;padding:0 35px 40px}
.on-acc__it.is-open .on-acc__body{display:block}
.on-acc__body p{margin:0;font-size:16px;line-height:27.2px}

/* ---------- giảng viên ---------- */
.on-team{padding:115px 0 85px}
.on-team .on-wrap{max-width:none;padding:0 12px}
.on-team__grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:0 24px;align-items:start}
.on-team__head{grid-column:span 2;padding:34px 0 34px 120px}
.on-team__head .on-h2{margin:0;max-width:420px}
.on-team__empty{grid-column:span 2}
.on-member{text-align:center;padding:34px 0}
.on-member__ava{display:grid;place-items:center;width:120px;height:120px;margin:0 auto 15px;border-radius:50%;border:5px solid #fff;box-shadow:0 10px 30px rgba(15,18,22,.1);color:#fff;font-size:36px;font-weight:700;background:linear-gradient(140deg,hsl(var(--h) 62% 62%),hsl(calc(var(--h) + 30) 58% 44%));transition:transform .25s}
.on-member:hover .on-member__ava{transform:translateY(-4px)}
.on-member h3{font-size:20px;line-height:24px;font-weight:600;color:#0f1216;margin:0 0 5px}
.on-member small{display:block;font-size:16px;line-height:20px;color:#5b5f64}
.on-team .on-center{margin-top:10px}

/* ---------- cảm nhận ---------- */
.on-voices{background:var(--on-bg);padding:120px 0 120px}
.on-voices__box{position:relative;max-width:1100px;margin:0 auto}
.on-voice{display:none;margin:0;position:relative;background:#fff;border:2px solid rgba(2,3,52,.05);border-radius:10px;padding:50px 100px 50px 60px;grid-template-columns:230px 1fr;grid-template-rows:auto 1fr;column-gap:70px;min-height:364px}
.on-voice.is-on{display:grid;animation:onFade .45s ease}
@keyframes onFade{from{opacity:0;transform:translateX(16px)}to{opacity:1;transform:none}}
.on-voice__pic{grid-row:span 2;align-self:start;display:grid;place-items:center;width:230px;height:260px;border-radius:6px;background:linear-gradient(150deg,hsl(var(--h) 70% 66%),hsl(calc(var(--h) + 35) 62% 46%));overflow:hidden;position:relative}
.on-voice__pic::after{content:"";position:absolute;width:180px;height:180px;right:-60px;bottom:-60px;border-radius:50%;border:24px solid rgba(255,255,255,.14)}
.on-voice__pic b{font-size:66px;font-weight:700;color:#fff;letter-spacing:.02em}
.on-voice figcaption{padding-top:5px}
.on-voice figcaption b{display:block;font-size:20px;line-height:34px;font-weight:700;color:#0f1216}
.on-voice figcaption small{display:block;font-size:16px;line-height:27px;color:#5b5f64;margin-top:0}
.on-voice blockquote{margin:16px 0 0;font-size:20px;line-height:32px;color:#5b5f64}
.on-voice__q{position:absolute;right:82px;bottom:-8px;width:62px;height:46px;color:var(--on-bg)}
.on-voices__nav{position:absolute;top:50%;width:70px;height:70px;margin-top:-35px;border-radius:50%;border:4px solid #f2f4f9;background:#fff;color:var(--on-navy);box-shadow:-6px 20px 30px rgba(15,18,22,.06);cursor:pointer;display:grid;place-items:center;transition:background .2s,color .2s}
.on-voices__nav:hover{background:var(--ac);color:#fff}
.on-voices__nav svg{width:16px;height:16px}
.on-voices__nav.is-prev{left:-35px}
.on-voices__nav.is-next{right:-35px}

/* ---------- tin tức ---------- */
.on-blog{padding:90px 0 130px}
.on-blog__grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:30px}
.on-blog__grid.is-few{grid-template-columns:repeat(3,minmax(0,1fr));max-width:990px;margin:0 auto}
.on-post{background:#fff;border-radius:6px;overflow:hidden;box-shadow:0 30px 60px rgba(0,15,56,.1);display:flex;flex-direction:column;transition:transform .25s}
.on-post:hover{transform:translateY(-5px)}
.on-post__img{position:relative;display:block;aspect-ratio:300/200;overflow:hidden}
.on-post__img img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.on-post:hover .on-post__img img{transform:scale(1.05)}
.on-post__body{padding:28px 36px 32px 37px}
.on-post__cat{display:block;color:var(--on-red);font-size:16px;line-height:27px;margin-bottom:0}
.on-post h3{font-size:20px;line-height:28px;font-weight:600;color:#0f1216;margin:0 0 16px;padding-top:5px;min-height:61px}
.on-post h3 a:hover{color:var(--ac)}
.on-post .on-tag{right:18px;top:16px;padding:4px 12px 5px;line-height:18px}
.on-post__by{display:flex;align-items:center;gap:8px;font-size:16px;line-height:27px;color:#5b5f64}
.on-post__by svg{width:17px;height:17px}

/* ---------- kêu gọi ---------- */
.on-cta{position:relative;padding:40px 0 0;background:#fff}
main>.on-cta:last-child{background:linear-gradient(180deg,#fff calc(50% + 20px),#0F1217 calc(50% + 20px))}
.on-blog+.on-cta{padding-top:0}
main>.on-blog+.on-cta:last-child{background:linear-gradient(180deg,#fff 111px,#0F1217 111px)}
.on-cta__box{position:relative;overflow:hidden;display:flex;align-items:center;justify-content:space-between;gap:30px;min-height:228px;padding:50px 55px;border-radius:10px;background:linear-gradient(105deg,#C90838 0%,#D60E3F 45%,#C2073A 100%)}
.on-cta__wave{position:absolute;inset:0;pointer-events:none;background:radial-gradient(ellipse 360px 220px at 74% 120%,rgba(255,255,255,.08) 60%,transparent 61%),radial-gradient(ellipse 420px 260px at 52% 150%,rgba(255,255,255,.06) 60%,transparent 61%),radial-gradient(circle 140px at 100% 0,rgba(255,255,255,.07) 98%,transparent 100%)}
.on-cta__dots{position:absolute;right:150px;bottom:24px;width:70px;height:56px;background:radial-gradient(circle,rgba(255,255,255,.45) 1.4px,transparent 2px) 0 0/12px 12px}
.on-cta__text{position:relative}
.on-cta__text span{display:block;color:#fff;font-weight:600;font-size:16px;line-height:20px;margin-bottom:8px}
.on-cta h2{color:#fff;font-size:clamp(28px,3.1vw,44px);line-height:1.137;font-weight:700;margin:0;max-width:684px}
.on-cta h2 em{color:#fff}
.on-cta .on-btn{position:relative;flex:none;min-width:164px;margin-right:39px}

/* ---------- chân trang ---------- */
.on-foot{background:#0F1217;color:#b7b7b9;padding-top:100px;font-size:16px}
.on-foot__grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:40px 24px;padding-bottom:93px}
.on-foot__grid>:nth-child(2){padding-left:100px}
.on-foot__grid>:nth-child(3){padding-left:50px}
.on-foot h4{color:#fff;font-size:22px;line-height:24px;font-weight:700;margin:0 0 30px}
.on-foot a{display:block;padding:0 0 3px;font-weight:600;line-height:30px;color:#b7b7b9;width:max-content;max-width:100%}
.on-foot a:hover{color:#fff}
.on-foot__logo{display:flex!important;align-items:center;gap:10px;margin:-10px 0 25px;padding:0!important;color:#fff!important;font-weight:800;font-size:22px}
.on-foot__logo img{height:44px;width:auto;max-width:150px;object-fit:contain;background:#fff;border-radius:6px;padding:3px}
.on-foot__about p{color:#fff;font-size:18px;line-height:24px;font-weight:500;margin:0 0 26px;max-width:306px}
.on-foot__ct{display:flex!important;align-items:center;gap:10px;font-size:18px;line-height:24px!important;padding:0 0 10px!important}
.on-foot__ct svg{width:21px;height:21px;color:#fff;flex:none}
.on-foot__addr{color:#b7b7b9!important;font-size:16px!important;line-height:24px!important;margin:0!important;font-weight:400!important}
.on-foot__find p{color:#fff;font-size:16px;line-height:24px;margin:-6px 0 26px;max-width:306px}
.on-foot__form{display:flex;max-width:306px;height:58px}
.on-foot__form input{flex:1;min-width:0;border:0;padding:15px 20px 16px 30px;font:inherit;font-size:16px;color:var(--ink);background:#fff;outline:0;border-radius:4px 0 0 4px}
.on-foot__form button{flex:none;width:60px;border:0;background:var(--ac);color:#fff;cursor:pointer;display:grid;place-items:center;border-radius:0 4px 4px 0}
.on-foot__form button:hover{background:var(--ac-d)}
.on-foot__form svg{width:18px;height:18px}
.on-foot__bottom{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;border-top:1px solid rgba(255,255,255,.1);padding-top:20px;padding-bottom:20px;min-height:85px;font-size:14px;line-height:22px;font-weight:600;color:#a6a6a8}
.on-foot__copy em{color:var(--ac)}
.on-foot__social{display:flex;align-items:center;gap:12px}
.on-foot__social span{color:#b7b7b9;font-size:16px;font-weight:700;margin-right:8px}
.on-foot__social a{display:grid!important;place-items:center;width:44px;height:44px;padding:0!important;border-radius:50%;border:2px solid rgba(255,255,255,.1);color:#fff;font-size:14px}
.on-foot__social svg{width:17px;height:17px}
.on-foot__social a:hover{background:var(--ac);border-color:var(--ac)}

/* ---------- màn hình vừa ---------- */
@media (max-width:1360px){
  .on-head__phone{display:none}
}
@media (max-width:1240px){
  .on-hero__card,.on-hero__chip,.on-hero__ring--a,.on-hero__dash{display:none}
  .on-hero__pic{left:auto;right:-110px;width:260px;height:260px}
  .on-hero__list{display:none}
  .on-hero__dot{left:auto;right:180px}
  .on-hero__ring--b{left:-560px}
  .on-nav a{padding:10px 9px;font-size:16px}
}
@media (max-width:1100px){
  .on-topics__grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .on-blog__grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .on-team__grid{grid-template-columns:repeat(3,minmax(0,1fr))}
  .on-team__head{grid-column:1/-1;padding-left:0;text-align:center}
  .on-team__head .on-h2{margin:0 auto}
  .on-about__in{gap:60px}
  .on-about__frame{display:none}
  .on-foot__grid{grid-template-columns:1fr 1fr}
  .on-foot__grid>:nth-child(n){padding-left:0}
  .on-team__head{padding:20px 0 0}
}
@media (max-width:991px){
  .on-nav{position:absolute;left:0;right:0;top:100%;flex-direction:column;background:#fff;padding:10px 20px 18px;box-shadow:0 14px 24px rgba(15,18,22,.1);display:none;gap:0}
  .on-nav.is-open{display:flex}
  .on-nav a{padding:12px 4px;border-bottom:1px solid var(--on-line)}
  .on-nav__login{display:block}
  .on-head__login{display:none}
  .on-burger{display:flex}
  .on-head__in{min-height:72px;position:relative}
  .on-head__act{margin-left:auto}
  .on-sec{padding:80px 0}
  .on-hero{min-height:0;display:flex;flex-direction:column;padding:0}
  .on-hero__in{padding-top:70px;padding-bottom:30px}
  .on-hero__pic{order:2;position:relative;left:auto;right:auto;top:auto;width:240px;height:240px;margin:10px auto 70px;z-index:2}
  .on-hero__list,.on-hero__dot{display:none}
  .on-topics{padding:80px 0}
  .on-about{padding:0 0 90px}
  .on-about__in,.on-faq__in{grid-template-columns:1fr;gap:50px}
  .on-about__media{max-width:640px}
  .on-about__text{padding-top:0}
  .on-cf__grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .on-faq__ring{display:none}
  .on-voice{grid-template-columns:170px 1fr;column-gap:36px;padding:40px 60px 40px 40px}
  .on-voice__pic{width:170px;height:200px}
  .on-voices__nav.is-prev{left:-14px}
  .on-voices__nav.is-next{right:-14px}
  .on-cta__box{flex-direction:column;align-items:flex-start;padding:44px 36px}
  .on-cta .on-btn{margin-right:0}
}
@media (max-width:640px){
  .on-wrap{padding:0 16px}
  .on-hero__in{padding-top:60px;padding-bottom:30px}
  .on-sec,.on-topics,.on-faq,.on-team,.on-voices,.on-blog{padding:60px 0}
  .on-about{padding:0 0 60px}
  .ac .on-h2{font-size:30px}
  .on-shead{margin-bottom:32px}
  .on-head__cta{display:none}
  .on-logo b{font-size:18px}
  .on-logo img{height:38px}
  .on-hero h1{font-size:36px;margin-bottom:34px}
  .on-hero h1 em{padding-bottom:12px}
  .on-hero h1 em::after{height:16px}
  .on-search input{height:54px;padding:0 16px}
  .on-search button{height:54px;width:52px}
  .on-hero__ask{font-size:16px}
  .on-hero__stats{grid-template-columns:1fr;gap:26px;margin-top:44px;background:none;padding-top:0;max-width:300px;margin-left:auto;margin-right:auto}
  .on-hero__stat b{font-size:34px}
  .on-hero__ring--b{display:none}
  .on-hero__pic{width:200px;height:200px;margin-bottom:56px}
  .on-topics__head{flex-direction:column;align-items:flex-start;gap:20px;margin-bottom:34px}
  .on-topics__grid,.on-topics__grid.is-3{grid-template-columns:1fr;gap:16px}
  .on-topic{padding:28px 26px;display:grid;grid-template-columns:64px 1fr;column-gap:18px;align-items:center}
  .on-topic__ic{width:64px;height:64px;margin:0;grid-row:span 2}
  .on-topic__ic svg{width:28px;height:28px}
  .on-topic b{align-self:end}
  .on-topic small{align-self:start}
  .on-about__media{padding:16px 16px 22px 22px}
  .on-about__dots{left:4px}
  .on-about__ring{width:52px;height:52px;border-width:4px}
  .on-about__text>p{font-size:17px}
  .on-cf__head{margin-bottom:24px;flex-basis:100%}
  .on-tabs{gap:10px;margin-bottom:30px}
  .on-tabs button{min-width:0}
  .on-cf__grid{grid-template-columns:1fr;gap:24px}
  .on-course__body{padding:24px 22px 20px}
  .on-acc__it button{padding:18px 20px;font-size:17px}
  .on-acc__it.is-open button{padding-top:20px}
  .on-acc__body{padding:0 20px 22px}
  .on-team__grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:40px 16px}
  .on-member__ava{width:100px;height:100px;font-size:30px}
  .on-member h3{font-size:18px}
  .on-voice{grid-template-columns:1fr;padding:30px 22px 70px;text-align:center}
  .on-voice__pic{grid-row:auto;width:140px;height:150px;margin:0 auto}
  .on-voice__pic b{font-size:46px}
  .on-voice figcaption{padding-top:18px}
  .on-voice blockquote{font-size:17px;margin-top:14px}
  .on-voice__q{right:22px;width:46px;height:34px}
  .on-voices__nav{top:auto;bottom:16px;margin-top:0;width:46px;height:46px}
  .on-voices__nav.is-prev{left:calc(50% - 54px)}
  .on-voices__nav.is-next{right:calc(50% - 54px)}
  .on-blog__grid,.on-blog__grid.is-few{grid-template-columns:1fr;gap:24px}
  .on-post__body{padding:24px 24px 26px}
  .on-cta__box{padding:36px 24px;min-height:0}
  .on-cta h2{font-size:28px}
  .on-cta .on-btn{width:100%}
  .on-cta__dots{right:20px}
  .on-foot{padding-top:64px}
  .on-foot__grid{grid-template-columns:1fr;gap:32px;padding-bottom:50px}
  .on-foot__bottom{flex-direction:column-reverse;align-items:flex-start}
}

/* 23/10/2026: màn hình 1241–1760 px — khung ý chính cạnh ảnh tròn bị tràn mép phải → đưa xuống dưới ảnh và giữ trong màn hình; ô số liệu nhỏ không lọt mép trái */
@media (min-width:1241px) and (max-width:1760px){
  .on-hero__list{left:min(20px,calc(50vw - 728px));top:320px}
  .on-hero__chip{left:max(16px,calc(50% - 660px))}
}
@media (min-width:1241px) and (max-width:1399px){
  .on-hero__dot{display:none}
}

/* 28/10/2026 (test.langhub.vn): khi trường chọn bảng màu (thẻ <style id=sf-scheme>), màu đỏ riêng của kiểu này theo bảng màu */
html:has(style#sf-scheme) .ac-home-online{--on-red:var(--sch-ph,#D2093C);--on-navy:var(--dark,#00306E)}
html:has(style#sf-scheme) .on-cta__box{background:linear-gradient(105deg,var(--ac) 0%,color-mix(in srgb,var(--ac) 78%,#000) 100%)}