/* Giao diện storefront "Học viện" (23/10/2026) — tự viết, theo hệ thiết kế đã phân tích (1 phông Source Sans, 1 màu nhấn --ac,
   tiêu đề --ink, khối 100–120px, nền xen kẽ #F5F5F5, footer tối). Biến đặt ở layout: --ac, --ac-d, --ac-s, --ink. */
:root{--bg:#fff;--alt:#f5f6f8;--line:#e7e9ee;--text:#5b5f64;--muted:#8b9099;--dark:#0f1216;--dark2:#262930;--r:10px;--wrap:1240px;--shadow:0 10px 30px rgba(15,18,22,.08)}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body.ac{margin:0;background:var(--bg);color:var(--text);font:17px/1.65 "Source Sans 3","Source Sans Pro","Segoe UI",system-ui,sans-serif;-webkit-font-smoothing:antialiased}
.ac img{max-width:100%;display:block}
.ac a{color:inherit;text-decoration:none}
.ac h1,.ac h2,.ac h3,.ac h4{color:var(--ink);font-weight:700;line-height:1.2;margin:0 0 .5em;text-wrap:balance}
.ac em{font-style:normal;color:var(--ac)}
.ac-wrap{max-width:var(--wrap);margin:0 auto;padding:0 20px}
.ac-btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:12px 30px;border-radius:6px;background:var(--ac);color:#fff!important;font-weight:700;font-size:16px;border:2px solid var(--ac);cursor:pointer;transition:background .2s,transform .2s,box-shadow .2s;font-family:inherit}
.ac-btn:hover{background:var(--ac-d);border-color:var(--ac-d);transform:translateY(-2px);box-shadow:0 8px 18px var(--ac-s)}
.ac-btn--sm{min-height:40px;padding:8px 20px;font-size:15px}
.ac-btn--ghost{background:transparent;border-color:rgba(255,255,255,.8)}
.ac-btn--ghost:hover{background:#fff;color:var(--ink)!important;border-color:#fff}
.ac-btn--line{background:transparent;color:var(--ac)!important}
.ac-btn--line:hover{background:var(--ac);color:#fff!important}
.ac-btn--light{background:#fff;color:var(--ac)!important;border-color:#fff}
.ac-btn--light:hover{background:var(--dark);border-color:var(--dark);color:#fff!important}
.ac-home-distance .ac-btn,.ac-home-skills .ac-btn,.ac-home-coach .ac-btn{border-radius:50px}
.ac-link{color:var(--ac);font-weight:700}
.ac-link:hover{text-decoration:underline}
.ac-center{text-align:center;margin-top:40px}
.ac-empty{text-align:center;color:var(--muted);background:var(--alt);border:1px dashed var(--line);border-radius:var(--r);padding:22px;margin:0}
.ac-input{width:100%;min-height:46px;padding:10px 14px;border:1px solid var(--line);border-radius:6px;font:inherit;color:var(--ink);background:#fff}
.ac-input:focus{outline:2px solid var(--ac);outline-offset:1px}
:focus-visible{outline:3px solid var(--ac);outline-offset:2px}

/* ---------- đầu trang ---------- */
.ac-topbar{background:var(--ink);color:rgba(255,255,255,.85);font-size:14px}
.ac-topbar .ac-wrap{display:flex;justify-content:space-between;gap:16px;min-height:40px;align-items:center;flex-wrap:wrap}
.ac-topbar__r{display:flex;gap:18px}
.ac-topbar a:hover{color:#fff}
.ac-head{position:sticky;top:0;z-index:40;background:#fff;box-shadow:0 1px 0 var(--line);transition:box-shadow .2s}
.ac-head.is-scrolled{box-shadow:0 6px 20px rgba(15,18,22,.08)}
.ac-head__in{display:flex;align-items:center;gap:24px;min-height:78px}
.ac-logo{display:flex;align-items:center;gap:10px;color:var(--ink)!important;font-weight:800;font-size:20px;flex:none}
.ac-logo img{height:42px;width:auto;max-width:150px;object-fit:contain}
.ac-nav{display:flex;gap:4px;margin-left:auto}
.ac-nav a{padding:10px 14px;font-weight:600;color:var(--ink);border-radius:6px;position:relative}
.ac-nav a:hover,.ac-nav a.is-on{color:var(--ac)}
.ac-nav a.is-on::after{content:"";position:absolute;left:14px;right:14px;bottom:4px;height:2px;background:var(--ac);border-radius:2px}
.ac-nav__login{display:none}
.ac-head__act{display:flex;align-items:center;gap:14px}
.ac-link-login{font-weight:600;color:var(--ink)}
.ac-link-login:hover{color:var(--ac)}
.ac-burger{display:none;width:44px;height:44px;border:1px solid var(--line);border-radius:8px;background:#fff;cursor:pointer;flex-direction:column;justify-content:center;align-items:center;gap:4px}
.ac-burger i{display:block;width:20px;height:2px;background:var(--ink);border-radius:2px}

/* ---------- khối chung ---------- */
.ac-sec{padding:110px 0}
.ac-sec--tight{padding:60px 0 90px}
.ac-alt{background:var(--alt)}
.ac-shead{position:relative;margin:0 0 48px}
.ac-shead.is-center{text-align:center;max-width:760px;margin-left:auto;margin-right:auto}
.ac-shead h2{font-size:clamp(28px,3.4vw,40px);position:relative;z-index:1}
.ac-shead p{margin:0;color:var(--text);font-size:18px;position:relative;z-index:1}
.ac-squiggle{width:80px;height:10px;color:var(--ac);margin-top:12px}
.ac-shead.is-center .ac-squiggle{margin-left:auto;margin-right:auto;display:block}
.ac-ghost{display:none}
.ac-home-skills .ac-ghost{display:block;position:absolute;left:0;right:0;top:-38px;font-size:clamp(48px,9vw,110px);font-weight:800;line-height:1;color:var(--ink);opacity:.05;text-transform:uppercase;letter-spacing:.04em;white-space:nowrap;overflow:hidden;pointer-events:none}
.ac-eyebrow,.ac-badge{display:inline-block;font-weight:700;font-size:14px;letter-spacing:.06em;text-transform:uppercase;color:var(--ac);margin-bottom:10px}
.ac-badge{background:var(--ac);color:#fff;padding:6px 14px;border-radius:4px;letter-spacing:.02em;text-transform:none;font-size:15px}
.ac-lead{font-size:19px}
.ac-grid{display:grid;gap:28px}
.ac-grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.ac-grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}
.ac-split{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center}
.ac-split--7-5{grid-template-columns:7fr 5fr}
.ac-checks{list-style:none;padding:0;margin:18px 0 26px;display:grid;gap:10px}
.ac-checks li{position:relative;padding-left:32px;color:var(--ink);font-weight:600}
.ac-checks li::before{content:"✓";position:absolute;left:0;top:1px;width:22px;height:22px;border-radius:50%;background:var(--ac-s);color:var(--ac);font-size:13px;display:grid;place-items:center;font-weight:800}

/* ---------- đầu trang chủ ---------- */
.ac-hero{position:relative;overflow:hidden}
.ac-hero__in{position:relative;z-index:2;display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center;min-height:600px;padding-top:60px;padding-bottom:60px}
.ac-hero h1{font-size:clamp(36px,5vw,62px);line-height:1.08;margin-bottom:18px}
.ac-hero p{font-size:19px;max-width:560px;margin:0 0 30px}
.ac-hero__btns{display:flex;gap:14px;flex-wrap:wrap}
.ac-hero__media{position:relative;align-self:end}
.ac-hero__media img{position:relative;z-index:1;width:100%;max-height:540px;object-fit:cover;border-radius:24px 24px 0 0}
.ac-blob{position:absolute;inset:10% -6% -4% 8%;background:var(--ac-s);border-radius:46% 54% 40% 60%/50% 40% 60% 50%;z-index:0}
.ac-hero__chip{position:absolute;z-index:2;left:-18px;bottom:40px;background:#fff;border-radius:14px;box-shadow:var(--shadow);padding:14px 20px;display:grid}
.ac-hero__chip b{font-size:28px;color:var(--ac);line-height:1}
.ac-hero__chip span{font-size:14px;color:var(--ink);font-weight:600}
/* ảnh nền toàn khối */
.ac-hero--photo .ac-hero__in,.ac-hero--slides .ac-hero__in{grid-template-columns:minmax(0,680px);min-height:660px}
.ac-hero__bg{position:absolute;inset:0;z-index:0}
.ac-slide{position:absolute;inset:0;background-size:cover;background-position:center;opacity:0;transition:opacity 1.2s}
.ac-slide.is-on{opacity:1}
.ac-hero--photo .ac-hero__bg::after,.ac-hero--slides .ac-hero__bg::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(0,22,52,.82),rgba(0,22,52,.35) 70%,rgba(0,22,52,.1))}
.ac-hero--photo h1,.ac-hero--slides h1,.ac-hero--photo p,.ac-hero--slides p{color:#fff}
.ac-hero--photo h1 em,.ac-hero--slides h1 em{color:#fff;text-decoration:underline;text-decoration-color:var(--ac);text-underline-offset:8px;text-decoration-thickness:4px}
/* chữ trái ảnh phải */
.ac-hero--split{background:linear-gradient(180deg,#f3f6fd,#fff)}
.ac-hero--soft{background:#f3f4fa}
.ac-hero--split .ac-btn--ghost,.ac-hero--soft .ac-btn--ghost,.ac-hero--center .ac-btn--ghost{color:var(--ink)!important;border-color:var(--ink)}
.ac-hero--split .ac-btn--ghost:hover,.ac-hero--soft .ac-btn--ghost:hover,.ac-hero--center .ac-btn--ghost:hover{background:var(--ink);color:#fff!important}
/* tiêu đề căn giữa + dải ảnh rộng (Học từ xa) */
.ac-hero--center{background:linear-gradient(180deg,#eef3ff,#fff 70%)}
.ac-hero--center .ac-hero__in{grid-template-columns:1fr;text-align:center;min-height:0;padding-top:80px;padding-bottom:0;gap:44px}
.ac-hero--center .ac-hero__text{max-width:820px;margin:0 auto}
.ac-hero--center p{margin-left:auto;margin-right:auto}
.ac-hero--center .ac-hero__btns{justify-content:center}
.ac-hero--center .ac-hero__media{max-width:none;align-self:auto}
.ac-hero--center .ac-hero__media img{max-height:440px;border-radius:24px 24px 0 0}
.ac-hero--center .ac-blob{inset:auto 6% -30px 6%;height:70%;border-radius:40px}
.ac-hero--soft .ac-hero__media img{border-radius:50% 50% 20px 20px}
/* nền tối */
.ac-hero--dark{background:var(--dark)}
.ac-hero--dark h1,.ac-hero--dark p{color:#fff}
.ac-hero--dark .ac-blob{background:rgba(255,255,255,.07)}
.ac-hero--dark .ac-btn--ghost{border-color:rgba(255,255,255,.5)}

/* ---------- dải môn học ---------- */
.ac-subjects{background:var(--alt);padding:26px 0}
.ac-subjects .ac-wrap{display:flex;flex-wrap:wrap;justify-content:center;gap:12px}
.ac-subjects span{background:#fff;border:1px solid var(--line);border-radius:50px;padding:8px 20px;font-weight:700;color:var(--ink)}

/* ---------- chủ đề ---------- */
.ac-topic{position:relative;display:block;border-radius:var(--r);overflow:hidden;min-height:300px;box-shadow:var(--shadow);background:var(--dark)}
.ac-topic__img{position:absolute;inset:0;background-size:cover;background-position:center;transition:transform .5s}
.ac-topic::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(0,0,0,0) 30%,rgba(0,0,0,.78))}
.ac-topic:hover .ac-topic__img{transform:scale(1.06)}
.ac-topic__body{position:absolute;left:0;right:0;bottom:0;z-index:1;padding:22px;color:#fff;display:grid;gap:4px}
.ac-topic__body b{font-size:21px}
.ac-topic__body small{font-size:14px;opacity:.85;line-height:1.4}
.ac-topic__body em{color:#fff;font-weight:700;font-size:14px;opacity:.9;margin-top:4px}

/* ---------- giới thiệu ---------- */
.ac-about__media{position:relative;min-height:480px}
.ac-about__a{width:72%;height:430px;object-fit:cover;border-radius:var(--r)}
.ac-about__b{position:absolute;right:0;bottom:0;width:52%;height:260px;object-fit:cover;border-radius:var(--r);border:8px solid #fff;box-shadow:var(--shadow)}
.ac-dots{position:absolute;left:-18px;bottom:20px;width:120px;height:120px;background-image:radial-gradient(var(--ac) 2px,transparent 2.5px);background-size:16px 16px;opacity:.35;z-index:-1}
.ac-about__text h2{font-size:clamp(28px,3.4vw,42px)}

/* ---------- danh sách mở rộng (accordion) ---------- */
.ac-acc{display:grid;gap:14px}
.ac-acc__it{background:#fff;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;transition:box-shadow .2s}
.ac-acc__it.is-open{box-shadow:var(--shadow);border-color:transparent}
.ac-acc__it button{width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px 22px;background:none;border:0;font:inherit;font-weight:700;font-size:18px;color:var(--ink);text-align:left;cursor:pointer}
.ac-acc__it button i{flex:none;width:30px;height:30px;border-radius:50%;background:var(--ac-s);color:var(--ac);display:grid;place-items:center;font-style:normal;font-size:20px;transition:transform .2s}
.ac-acc__it.is-open button i{transform:rotate(45deg);background:var(--ac);color:#fff}
.ac-acc__body{display:none;padding:0 22px 20px}
.ac-acc__it.is-open .ac-acc__body{display:block}
.ac-acc__body p{margin:0}
.ac-campus__img{min-height:460px;border-radius:var(--r);background-size:cover;background-position:center;box-shadow:var(--shadow)}
.ac-faq__img{border-radius:var(--r);max-height:340px;width:100%;object-fit:cover;margin-top:10px}

/* ---------- khóa học ---------- */
.ac-filterhead{display:flex;justify-content:space-between;align-items:flex-end;gap:20px;flex-wrap:wrap;margin-bottom:12px}
.ac-filterhead .ac-shead{margin-bottom:24px}
.ac-tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:24px}
.ac-tabs button{border:1px solid var(--line);background:#fff;border-radius:50px;padding:8px 18px;font:inherit;font-weight:700;color:var(--ink);cursor:pointer}
.ac-tabs button.is-on,.ac-tabs button:hover{background:var(--ac);border-color:var(--ac);color:#fff}
.ac-course{background:#fff;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;display:flex;flex-direction:column;height:100%;transition:transform .2s,box-shadow .2s}
.ac-course:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.ac-course__img{position:relative;display:block;aspect-ratio:16/10;background:var(--alt)}
.ac-course__img img{width:100%;height:100%;object-fit:cover}
.ac-course__art{position:absolute;inset:0;display:grid;place-items:center;font-size:44px;font-weight:800;color:#fff;background:linear-gradient(135deg,hsl(var(--h) 70% 55%),hsl(calc(var(--h) + 40) 70% 45%))}
.ac-course__tag{position:absolute;left:14px;top:14px;background:var(--ac);color:#fff;font-size:13px;font-weight:700;padding:4px 10px;border-radius:4px}
.ac-course__body{padding:18px 20px 16px;display:flex;flex-direction:column;flex:1}
.ac-course__meta{display:flex;gap:14px;flex-wrap:wrap;font-size:14px;color:var(--muted);margin-bottom:8px}
.ac-course h3{font-size:19px;margin-bottom:14px}
.ac-course h3 a:hover{color:var(--ac)}
.ac-course__foot{margin-top:auto;padding-top:14px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:10px;align-items:center;font-size:14px}
.ac-course__foot span{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.ac-course__foot b{color:var(--ac);font-size:18px;white-space:nowrap}
.ac-course__foot del{color:var(--muted);font-weight:400;font-size:13px;margin-left:6px}

/* ---------- con số ---------- */
.ac-stats{background:var(--ac);color:#fff;padding:70px 0}
.ac-home-skills .ac-stats{background:var(--dark2)}
.ac-stats h2{color:#fff;text-align:center;margin-bottom:30px}
.ac-stats__row{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:20px;text-align:center}
.ac-stats__row b{display:block;font-size:clamp(36px,4.4vw,54px);line-height:1.1;font-weight:800}
.ac-stats__row span{font-weight:600;opacity:.9}
.ac-stats__row div+div{border-left:1px solid rgba(255,255,255,.2)}

/* ---------- sự kiện ---------- */
.ac-events__list{display:grid;gap:16px}
.ac-event{display:grid;grid-template-columns:110px 1fr auto;gap:24px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:18px 22px;transition:box-shadow .2s}
.ac-event:hover{box-shadow:var(--shadow)}
.ac-event__date{text-align:center;border-right:1px solid var(--line);padding-right:18px}
.ac-event__date b{display:block;font-size:42px;line-height:1;color:var(--ac)}
.ac-event__date span{font-size:14px;color:var(--muted);font-weight:600}
.ac-event h3{font-size:20px;margin-bottom:4px}
.ac-event p{margin:0;font-size:15px}

/* ---------- cảm nhận ---------- */
.ac-voice{margin:0;background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:30px 28px 24px;position:relative;display:flex;flex-direction:column}
.ac-alt .ac-voice{border-color:transparent}
.ac-voice__q{position:absolute;right:22px;top:4px;font-size:90px;line-height:1;color:var(--ac-s);font-family:Georgia,serif}
.ac-voice blockquote{margin:0 0 20px;font-size:17px;color:var(--ink)}
.ac-voice figcaption{margin-top:auto;display:grid;grid-template-columns:48px 1fr;column-gap:12px;align-items:center}
.ac-voice figcaption b{color:var(--ink)}
.ac-voice figcaption small{grid-column:2;color:var(--muted)}
.ac-ava,.ac-member__ava{grid-row:span 2;width:48px;height:48px;border-radius:50%;display:grid;place-items:center;color:#fff;font-weight:800;background:hsl(var(--h) 60% 50%)}

/* ---------- giảng viên ---------- */
.ac-member{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:28px 22px;text-align:center;transition:transform .2s,box-shadow .2s}
.ac-member:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.ac-member__ava{width:110px;height:110px;margin:0 auto 16px;font-size:34px;border:6px solid #fff;box-shadow:0 0 0 2px var(--ac-s)}
.ac-member h3{font-size:20px;margin-bottom:2px}
.ac-member em{display:block;font-weight:600;font-size:15px;margin-bottom:8px}
.ac-member p{margin:0;font-size:15px}

/* ---------- lộ trình ---------- */
.ac-steps__list{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:24px;counter-reset:s}
.ac-steps__list li{background:#fff;border-radius:var(--r);padding:28px 24px;position:relative;box-shadow:0 2px 0 var(--line)}
.ac-steps__n{display:inline-grid;place-items:center;width:52px;height:52px;border-radius:50%;background:var(--ac);color:#fff;font-weight:800;font-size:18px;margin-bottom:16px}
.ac-steps__list h3{font-size:19px}
.ac-steps__list p{margin:0;font-size:15px}

/* ---------- học phí ---------- */
.ac-plan{background:#fff;border:1px solid var(--line);border-radius:16px;padding:34px 28px;display:flex;flex-direction:column}
.ac-plan.is-star{border:2px solid var(--ac);box-shadow:var(--shadow);transform:translateY(-10px)}
.ac-plan h3{font-size:22px}
.ac-plan__price b{font-size:40px;color:var(--ink);font-weight:800}
.ac-plan__price span{color:var(--muted);margin-left:6px}
.ac-plan .ac-btn{margin-top:auto}

/* ---------- video ---------- */
.ac-video{position:relative;background-size:cover;background-position:center;padding:150px 0;text-align:center;color:#fff}
.ac-video::before{content:"";position:absolute;inset:0;background:rgba(0,20,48,.66)}
.ac-video__in{position:relative;max-width:760px}
.ac-video h2{color:#fff;font-size:clamp(28px,3.6vw,44px)}
.ac-video p{color:rgba(255,255,255,.88);font-size:18px}
.ac-play{display:inline-grid;place-items:center;width:92px;height:92px;border-radius:50%;background:#fff;color:var(--ac);font-size:30px;margin-bottom:26px;box-shadow:0 0 0 14px rgba(255,255,255,.18);animation:acPulse 2s infinite}
@keyframes acPulse{50%{box-shadow:0 0 0 24px rgba(255,255,255,.06)}}

/* ---------- kêu gọi ---------- */
.ac-cta{background:var(--ac);color:#fff;padding:60px 0}
.ac-cta__in{display:flex;justify-content:space-between;align-items:center;gap:30px;flex-wrap:wrap}
.ac-cta h2{color:#fff;font-size:clamp(24px,3vw,34px);margin-bottom:6px}
.ac-cta p{margin:0;opacity:.9}
.ac-teach__in{display:flex;justify-content:space-between;align-items:center;gap:30px;flex-wrap:wrap;background:var(--alt);border-radius:16px;padding:44px 48px;border-left:6px solid var(--ac)}
.ac-teach h2{font-size:clamp(24px,3vw,32px);margin-bottom:6px}
.ac-teach p{margin:0}
.ac-teach.ac-sec{padding:70px 0}

/* ---------- tin tức ---------- */
.ac-post{background:#fff;border-radius:var(--r);overflow:hidden;display:flex;flex-direction:column;height:100%;transition:transform .2s,box-shadow .2s;border:1px solid var(--line)}
.ac-alt .ac-post{border-color:transparent}
.ac-post:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.ac-post__img{position:relative;display:block;aspect-ratio:16/10;overflow:hidden}
.ac-post__img img{width:100%;height:100%;object-fit:cover}
.ac-post__body{padding:20px 22px 24px}
.ac-post__body small{color:var(--muted);font-weight:600}
.ac-post h3{font-size:20px;margin:6px 0 10px}
.ac-post h3 a:hover{color:var(--ac)}
.ac-post p{margin:0;font-size:15px}

/* ---------- thư viện ảnh ---------- */
.ac-gallery__grid{display:grid;grid-template-columns:repeat(4,1fr);grid-auto-rows:210px;gap:14px}
.ac-gallery__grid img{width:100%;height:100%;object-fit:cover;border-radius:var(--r)}
.ac-gallery__grid img:nth-child(1){grid-row:span 2;grid-column:span 2}

/* ---------- trang con ---------- */
.ac-banner{background:var(--ink);color:#fff;padding:80px 0 70px;position:relative;overflow:hidden}
.ac-banner::after{content:"";position:absolute;right:-80px;top:-80px;width:320px;height:320px;border-radius:50%;border:50px solid rgba(255,255,255,.06)}
.ac-banner h1{color:#fff;font-size:clamp(32px,4.4vw,52px);margin:8px 0 6px}
.ac-banner p{margin:0;opacity:.85;max-width:640px}
.ac-crumb{font-size:15px;opacity:.8}
.ac-crumb a:hover{color:#fff;text-decoration:underline}
.ac-catalog{display:grid;grid-template-columns:280px 1fr;gap:36px;align-items:start}
.ac-side{display:grid;gap:20px;position:sticky;top:96px}
.ac-side__box{background:var(--alt);border-radius:var(--r);padding:22px}
.ac-side__box h3{font-size:17px;margin:14px 0 10px}
.ac-side__box h3:first-child{margin-top:0}
.ac-radio{display:flex;align-items:center;gap:10px;padding:5px 0;cursor:pointer;color:var(--ink)}
.ac-radio input{accent-color:var(--ac);width:18px;height:18px}
.ac-side__cta p{margin:0 0 12px;font-size:15px}
.ac-count{margin:0 0 16px;color:var(--muted);font-weight:600}
.ac-count a{color:var(--ac)}
.ac-pager{margin-top:36px;display:flex;justify-content:center}
.ac-pager nav>div:first-child{display:none}
.ac-pager svg{width:18px;height:18px}
.ac-emptybox{text-align:center;background:var(--alt);border-radius:16px;padding:56px 24px}
.ac-emptybox p{max-width:520px;margin:0 auto 20px}
.ac-searchbar{display:flex;gap:10px;max-width:560px;margin:0 auto 36px}
.ac-prose{max-width:820px;margin:0 auto;font-size:18px;color:var(--ink)}
.ac-prose img{border-radius:var(--r);height:auto}
.ac-contactcards{margin-bottom:40px}
.ac-ccard{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:30px;text-align:center}
.ac-ccard span{display:inline-grid;place-items:center;width:58px;height:58px;border-radius:50%;background:var(--ac-s);color:var(--ac);font-size:24px;margin-bottom:12px}
.ac-ccard p{margin:0}
.ac-ccard a{color:var(--ac);font-weight:700}
.ac-inner{padding-top:40px;padding-bottom:80px}

/* ---------- chân trang ---------- */
.ac-foot{background:var(--dark);color:rgba(255,255,255,.72);padding-top:90px;font-size:16px}
.ac-foot__grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:40px;padding-bottom:60px}
.ac-foot h4{color:#fff;font-size:19px;margin-bottom:18px}
.ac-foot a{display:block;padding:4px 0}
.ac-foot a:hover{color:#fff}
.ac-foot p{margin:0 0 10px}
.ac-logo--foot{color:#fff!important;margin-bottom:16px}
.ac-logo--foot img{background:#fff;border-radius:8px;padding:4px}
.ac-social{display:flex;gap:10px;margin-top:16px}
.ac-social a{display:grid;place-items:center;width:38px;height:38px;border-radius:50%;background:rgba(255,255,255,.08);font-size:13px;font-weight:700;padding:0}
.ac-social a:hover{background:var(--ac)}
.ac-foot .ac-btn{display:inline-flex}
.ac-foot__bottom{border-top:1px solid rgba(255,255,255,.1);padding:20px 0;font-size:15px;text-align:center}

/* ---------- màn hình nhỏ ---------- */
@media (max-width:1100px){
  .ac-grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .ac-steps__list{grid-template-columns:repeat(2,minmax(0,1fr))}
  .ac-foot__grid{grid-template-columns:1fr 1fr}
}
@media (max-width:991px){
  .ac-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}
  .ac-nav.is-open{display:flex}
  .ac-nav a{padding:12px 4px;border-bottom:1px solid var(--line)}
  .ac-nav a.is-on::after{display:none}
  .ac-nav__login{display:block}
  .ac-link-login{display:none}
  .ac-burger{display:flex}
  .ac-head__in{min-height:68px}
  .ac-sec{padding:76px 0}
  .ac-hero__in,.ac-split,.ac-split--7-5{grid-template-columns:1fr;gap:40px}
  .ac-hero__in{min-height:0;padding-top:56px;padding-bottom:56px}
  .ac-hero--photo .ac-hero__in,.ac-hero--slides .ac-hero__in{min-height:520px}
  .ac-hero__media{max-width:520px}
  .ac-hero--center .ac-hero__media{max-width:none}
  .ac-grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .ac-catalog{grid-template-columns:1fr}
  .ac-side{position:static}
  .ac-about__media{min-height:0}
  .ac-campus__img{min-height:300px}
}
@media (max-width:640px){
  body.ac{font-size:16px}
  .ac-wrap{padding:0 16px}
  .ac-sec{padding:60px 0}
  .ac-shead{margin-bottom:32px}
  .ac-grid--3,.ac-grid--4,.ac-steps__list{grid-template-columns:1fr}
  .ac-head__act .ac-btn{display:none}
  .ac-logo b{font-size:17px}
  .ac-logo img{height:36px}
  .ac-topbar__r{display:none}
  .ac-hero h1{font-size:34px}
  .ac-hero p{font-size:17px}
  .ac-hero__btns .ac-btn{flex:1 1 100%}
  .ac-hero__chip{left:8px;bottom:16px}
  .ac-about__a{width:100%;height:300px}
  .ac-about__b{position:relative;width:70%;height:170px;margin:-60px 0 0 auto}
  .ac-topic{min-height:240px}
  .ac-stats__row{grid-template-columns:repeat(2,minmax(0,1fr));row-gap:28px}
  .ac-stats__row div+div{border-left:0}
  .ac-event{grid-template-columns:72px 1fr;gap:14px;padding:16px}
  .ac-event__date b{font-size:32px}
  .ac-event .ac-btn{grid-column:1/-1}
  .ac-video{padding:100px 0}
  .ac-teach__in{padding:30px 22px}
  .ac-plan.is-star{transform:none}
  .ac-gallery__grid{grid-template-columns:1fr 1fr;grid-auto-rows:140px}
  .ac-foot__grid{grid-template-columns:1fr;gap:28px}
  .ac-foot{padding-top:60px}
  .ac-banner{padding:56px 0 48px}
  .ac-searchbar{flex-direction:column}
}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}