/* Ellacy Academy — bộ nhận diện 2026: Ellacy Red nhiều hơn Ink Black. Headline Playfair Display, còn lại Montserrat. */
:root{
  --ink:#111111;--red:#B30000;--red2:#D11A1A;--red-dark:#8F0000;--graphite:#3A3A3A;--slate:#6B7280;--mist:#F2F3F5;
  --line:#E4E6EA;--card:#fff;--bg:#fff;--ok:#0F7A4F;--ok-bg:#E9F7F0;--err:#B30000;--err-bg:#FDECEC;
  --max:1140px;--r:12px;--hd:#fff;
  --fh:"Playfair Display",Georgia,"Times New Roman",serif;
  --fb:Montserrat,system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;font:16px/1.65 var(--fb);color:var(--graphite);background:var(--bg);-webkit-font-smoothing:antialiased}
img,svg,video{max-width:100%;height:auto}
a{color:var(--red);text-decoration:none}
a:hover{color:var(--red2);text-decoration:underline}
h1,h2,h3,h4,.h1,.h2{font-family:var(--fh);color:var(--ink);line-height:1.15;margin:0 0 14px;font-weight:700;letter-spacing:-.01em}
h1,.h1{font-size:clamp(32px,4.8vw,52px);font-weight:900}
h2,.h2{font-size:clamp(26px,3.4vw,38px)}
h3{font-size:21px;margin-bottom:8px}
h4{font-size:15px;font-family:var(--fb);font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--ink)}
p{margin:0 0 14px}
b,strong{font-weight:700;color:var(--ink)}
.muted{color:var(--slate)}
.small{font-size:14px}
.tabular,.tbl td,.tbl th{font-variant-numeric:tabular-nums}
.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}
.sec{padding:64px 0}
.sec.mist{background:var(--mist)}
.sec.red{background:var(--red);color:#fff}
.sec.red h1,.sec.red h2,.sec.red h3,.sec.red b,.sec.red strong{color:#fff}
.sec.red .muted{color:rgba(255,255,255,.78)}
.sec.red a:not(.btn){color:#fff;text-decoration:underline}
.sec.ink{background:var(--ink);color:#fff}
.sec.ink h2,.sec.ink h3,.sec.ink b{color:#fff}
.sec-head{max-width:720px;margin-bottom:34px}
.sec-head p{font-size:17px;color:var(--slate)}
.sec.red .sec-head p{color:rgba(255,255,255,.85)}
.kicker{display:inline-block;font-size:13px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--red);margin-bottom:12px}
.sec.red .kicker{color:#fff;opacity:.85}
.bar:after{content:"";display:block;width:56px;height:4px;background:var(--red);margin:14px 0 0;border-radius:2px}
.sec.red .bar:after{background:#fff}
.center{text-align:center}
.center .bar:after{margin-left:auto;margin-right:auto}

/* Nút */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 22px;border-radius:8px;font-family:var(--fb);font-weight:600;font-size:15px;border:2px solid transparent;cursor:pointer;line-height:1.2;white-space:nowrap;transition:background .15s,border-color .15s,color .15s;text-decoration:none}
.btn:hover{text-decoration:none}
.btn.p{background:var(--red);color:#fff;border-color:var(--red)}
.btn.p:hover{background:var(--red2);border-color:var(--red2);color:#fff}
.btn.s{background:#fff;color:var(--red);border-color:var(--red)}
.btn.s:hover{background:var(--red);color:#fff}
.btn.w{background:#fff;color:var(--red);border-color:#fff}
.btn.w:hover{background:var(--mist);border-color:var(--mist);color:var(--red-dark)}
.btn.ws{background:transparent;color:#fff;border-color:rgba(255,255,255,.7)}
.btn.ws:hover{background:#fff;color:var(--red);border-color:#fff}
.btn.sm{padding:8px 14px;font-size:14px}
.btn:disabled{opacity:.6;cursor:wait}
.cta{display:flex;gap:12px;flex-wrap:wrap;align-items:center}

/* Thẻ, lưới, bảng */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:24px}
.card p{margin:0 0 10px;font-size:15px}
.card p:last-child{margin-bottom:0}
.card ul{margin:8px 0 0;padding-left:18px;font-size:15px}
.card li{margin:4px 0}
.card.hi{border-color:var(--red);box-shadow:0 0 0 3px rgba(179,0,0,.08)}
.card.red{background:var(--red);border-color:var(--red);color:#fff}
.card.red h3,.card.red b{color:#fff}
.card.red p{color:rgba(255,255,255,.88)}
.card .more{display:inline-block;margin-top:12px;font-weight:600}
.grid{display:grid;gap:20px}
.grid.c2{grid-template-columns:repeat(2,1fr)}
.grid.c3{grid-template-columns:repeat(3,1fr)}
.grid.c4{grid-template-columns:repeat(4,1fr)}
.tbl{width:100%;border-collapse:collapse;font-size:15px;background:#fff;border:1px solid var(--line);border-radius:var(--r);overflow:hidden}
.tbl th,.tbl td{padding:12px 14px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
.tbl th{background:var(--mist);font-size:13px;letter-spacing:.05em;text-transform:uppercase;color:var(--graphite);font-weight:700}
.tbl tr:last-child td{border-bottom:0}
.tbl td:first-child{font-weight:600;color:var(--ink)}
.scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}
.pill{display:inline-block;padding:4px 11px;border-radius:999px;font-size:13px;font-weight:600;background:var(--mist);color:var(--graphite);line-height:1.4}
.pill.red{background:var(--red);color:#fff}
.pill.line{background:#fff;border:1px solid var(--red);color:var(--red)}
.tags{display:flex;flex-wrap:wrap;gap:8px}
.alert{padding:12px 16px;border-radius:8px;font-size:15px;border:1px solid var(--line);background:var(--mist);color:var(--graphite);margin:12px 0}
.alert.ok{background:var(--ok-bg);border-color:#BFE6D1;color:var(--ok)}
.alert.err{background:var(--err-bg);border-color:#F3B8B8;color:var(--err)}
.alert:empty{display:none}

/* Form */
.field{display:block;margin-bottom:14px}
.field>span,.field label,label.lb{display:block;font-size:13px;font-weight:600;color:var(--graphite);margin-bottom:6px}
input,select,textarea{width:100%;padding:11px 13px;border:1px solid #CBD0D8;border-radius:8px;font:inherit;font-size:15px;color:var(--ink);background:#fff;transition:border-color .15s,box-shadow .15s}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--red);box-shadow:0 0 0 3px rgba(179,0,0,.12)}
input[type=checkbox],input[type=radio]{width:auto;padding:0;margin:0 8px 0 0;accent-color:var(--red);vertical-align:middle}
textarea{min-height:90px;resize:vertical}
select{appearance:none;-webkit-appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' fill='none' stroke='%233A3A3A' stroke-width='2'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 13px center;padding-right:36px}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.checks{display:flex;flex-wrap:wrap;gap:8px 18px}
.checks label{display:inline-flex;align-items:center;font-size:15px;font-weight:500;color:var(--graphite);cursor:pointer;margin:0}
.hp{position:absolute;left:-9999px;opacity:0;height:0;width:0}
.form-box{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:28px}
.form-box h3{margin-bottom:4px}
.form-box .lead{color:var(--slate);font-size:15px;margin-bottom:18px}

/* Header */
header.top{position:sticky;top:0;z-index:40;background:var(--hd);border-bottom:3px solid var(--red)}
header.top .wrap{display:flex;align-items:center;gap:14px;height:68px}
.logo{display:inline-flex;align-items:center;flex-shrink:0}
.logo img{height:44px;width:auto;display:block}
.logo:hover{text-decoration:none}
nav.main{display:flex;gap:2px;margin-left:10px}
nav.main a{padding:8px 11px;border-radius:6px;color:var(--ink);font-weight:600;font-size:14.5px;white-space:nowrap}
nav.main a:hover{background:var(--mist);color:var(--red);text-decoration:none}
nav.main a.on{color:var(--red);box-shadow:inset 0 -3px 0 var(--red);border-radius:6px 6px 0 0}
.spacer{flex:1}
.el-auth{display:flex;align-items:center;min-width:110px;justify-content:flex-end}
.menu-btn{display:none;background:#fff;border:1px solid var(--line);border-radius:8px;padding:7px 9px;color:var(--ink);cursor:pointer;line-height:0}
.menu-btn:hover{border-color:var(--red);color:var(--red)}
/* Menu người dùng (el-auth.js đổ vào #elAuth) */
.el-user{position:relative}
.el-user-btn{background:#fff;border:1px solid var(--line);border-radius:999px;padding:7px 14px;font:inherit;font-size:14px;font-weight:600;color:var(--ink);cursor:pointer;max-width:200px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.el-user-btn:hover{border-color:var(--red);color:var(--red)}
.el-user-menu{position:absolute;right:0;top:calc(100% + 8px);min-width:190px;background:#fff;border:1px solid var(--line);border-radius:10px;box-shadow:0 12px 32px rgba(17,17,17,.14);padding:6px;z-index:50;display:flex;flex-direction:column}
.el-user-menu[hidden]{display:none}
.el-user-menu a,.el-user-menu button{display:block;width:100%;text-align:left;padding:9px 12px;border:0;background:none;font:inherit;font-size:14.5px;font-weight:500;color:var(--ink);border-radius:6px;cursor:pointer;text-decoration:none}
.el-user-menu a:hover,.el-user-menu button:hover{background:var(--mist);color:var(--red);text-decoration:none}
.el-user-menu button{color:var(--red)}

/* Hero */
.hero{background:var(--red);color:#fff;padding:72px 0 64px;position:relative;overflow:hidden}
.hero:before{content:"";position:absolute;right:-120px;top:-120px;width:420px;height:420px;border-radius:50%;background:rgba(255,255,255,.06)}
.hero .wrap{position:relative}
.hero h1{color:#fff;max-width:760px}
.hero .lead{font-size:clamp(17px,2vw,20px);max-width:640px;color:rgba(255,255,255,.9);margin-bottom:28px}
.hero .kicker{color:#fff;opacity:.85}
.hero .tag{font-family:var(--fh);font-style:italic;font-size:18px;color:rgba(255,255,255,.85);margin-bottom:10px}
.hero.two{display:block}
.hero.two .wrap{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center}
.hero.two img{border-radius:var(--r);box-shadow:0 20px 50px rgba(0,0,0,.25);display:block;width:100%;object-fit:cover;aspect-ratio:4/3}
.hero.slim{padding:56px 0 48px}

/* Dải số liệu */
.stats{background:var(--ink);color:#fff}
.stats .wrap{display:grid;grid-template-columns:repeat(4,1fr)}
.stats div{padding:26px 18px;border-left:1px solid rgba(255,255,255,.12);text-align:center}
.stats div:first-child{border-left:0}
.stats b{display:block;font-family:var(--fh);font-size:clamp(28px,3.6vw,42px);color:#fff;line-height:1.1;font-variant-numeric:tabular-nums}
.stats span{font-size:14px;color:rgba(255,255,255,.72)}

/* Thẻ lớp */
.lop{display:flex;flex-direction:column;border-top:5px solid var(--red)}
.lop h3{font-size:24px}
.lop .hinh{font-size:14px;color:var(--slate);margin:10px 0 16px;padding-top:12px;border-top:1px dashed var(--line)}
.lop .cta{margin-top:auto}

/* Các bước */
.steps{counter-reset:s}
.steps .card{position:relative;padding-top:60px}
.steps .card:before{counter-increment:s;content:counter(s);position:absolute;top:20px;left:24px;width:32px;height:32px;border-radius:50%;background:var(--red);color:#fff;font-weight:700;font-size:15px;display:grid;place-items:center;font-family:var(--fh)}

/* Giáo viên */
.gv .card{border-top:5px solid var(--ink)}
.gv .ten{font-family:var(--fh);font-size:22px;color:var(--ink);margin-bottom:2px}
.gv .vai{color:var(--red);font-weight:600;font-size:14px;margin-bottom:10px}
.gv .band{display:inline-block;font-family:var(--fh);font-size:34px;font-weight:900;color:var(--red);line-height:1;margin-bottom:6px}

/* Lộ trình */
.lo-trinh{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:14px;counter-reset:lv}
.lo-trinh .card{position:relative;padding-top:22px}
.lo-trinh .card:before{counter-increment:lv;content:"Level " counter(lv);display:inline-block;font-size:12px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--red);margin-bottom:6px}
.lo-trinh.chang .card:before{content:"Chặng " counter(lv)}
.lo-trinh h3{font-size:19px}
.lo-trinh .muc{font-family:var(--fh);font-size:26px;color:var(--ink);margin-bottom:6px}

/* Ảnh */
.pics{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.pics figure{margin:0;border-radius:var(--r);overflow:hidden;background:var(--mist)}
.pics img{width:100%;aspect-ratio:4/3;object-fit:cover;display:block}
.pics figcaption{font-size:13px;color:var(--slate);padding:8px 12px}

/* Giới thiệu */
.split{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:center}
.split img{border-radius:var(--r);width:100%;display:block;object-fit:cover;aspect-ratio:4/3}
.moc{display:grid;gap:12px;margin-top:20px}
.moc div{display:grid;grid-template-columns:76px 1fr;gap:14px;align-items:start}
.moc b{font-family:var(--fh);font-size:22px;color:var(--red);line-height:1.2}
.gia-tri{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:24px}
.gia-tri div{background:var(--mist);border-radius:10px;padding:16px}
.gia-tri b{display:block;font-family:var(--fh);font-size:18px;color:var(--ink);margin-bottom:4px}
.gia-tri span{font-size:14px;color:var(--graphite)}

/* Danh sách môn AP */
.mon-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:10px}
.mon-list a{display:flex;align-items:center;justify-content:space-between;gap:10px;background:#fff;border:1px solid var(--line);border-radius:10px;padding:12px 14px;color:var(--ink);font-weight:600;font-size:15px}
.mon-list a:hover{border-color:var(--red);color:var(--red);text-decoration:none}
.mon-list a span{font-size:12px;color:var(--slate);font-weight:500;white-space:nowrap}
.mon-list a:hover span{color:var(--red)}

/* Khối kho luyện đề */
.kho{background:var(--ink);color:#fff;border-radius:var(--r);padding:32px;display:grid;grid-template-columns:1.2fr .8fr;gap:30px;align-items:center}
.kho h2,.kho h3,.kho b{color:#fff}
.kho p{color:rgba(255,255,255,.82)}
.kho ul{margin:10px 0 0;padding-left:18px;color:rgba(255,255,255,.88);font-size:15px}
.kho li{margin:4px 0}
.kho .ok-list{list-style:none;padding:0}
.kho .ok-list li{padding-left:22px;position:relative}
.kho .ok-list li:before{content:"";position:absolute;left:0;top:9px;width:11px;height:11px;border-radius:50%;background:var(--red2)}

/* Footer */
footer.ft{background:var(--ink);color:rgba(255,255,255,.78);font-size:14px;padding:52px 0 36px;margin-top:0;border-top:6px solid var(--red)}
footer.ft h4{color:#fff;margin:0 0 8px}
footer.ft h4+p+h4{margin-top:18px}
footer.ft p{margin:0 0 12px}
footer.ft b{color:#fff}
footer.ft a{color:#fff;text-decoration:none}
footer.ft a:hover{color:#fff;text-decoration:underline}
.ft-cols{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:32px;margin-bottom:28px}
.ft-brand img{background:#fff;border-radius:8px;padding:8px 12px;width:220px;height:auto;margin-bottom:14px}
.ft-legal{border-top:1px solid rgba(255,255,255,.12);padding-top:18px;font-size:13px;color:rgba(255,255,255,.6)}
.ft-legal p{margin:0 0 6px}

/* 404 */
.e404{padding:90px 0;text-align:center}
.e404 .big{font-family:var(--fh);font-size:clamp(72px,14vw,140px);font-weight:900;color:var(--red);line-height:1;margin-bottom:8px}

/* Responsive */
@media (max-width:980px){
  .grid.c4{grid-template-columns:repeat(2,1fr)}
  .grid.c3{grid-template-columns:repeat(2,1fr)}
  .gia-tri{grid-template-columns:repeat(2,1fr)}
  .pics{grid-template-columns:repeat(2,1fr)}
  .hero.two .wrap{grid-template-columns:1fr}
  .hero.two img{max-height:320px}
  .kho{grid-template-columns:1fr}
  .ft-cols{grid-template-columns:1fr 1fr}
}
@media (max-width:820px){
  nav.main{display:none;position:absolute;left:0;right:0;top:100%;background:#fff;border-bottom:3px solid var(--red);flex-direction:column;padding:8px 12px 14px;gap:2px;box-shadow:0 14px 30px rgba(17,17,17,.12)}
  nav.main.open{display:flex}
  nav.main a{padding:12px 10px;font-size:16px;border-radius:8px}
  nav.main a.on{box-shadow:none;background:var(--mist)}
  .menu-btn{display:inline-flex}
  header.top .wrap{position:relative;height:62px;gap:10px}
  .logo img{height:38px}
  .el-auth{min-width:0}
}
@media (max-width:640px){
  .sec{padding:44px 0}
  .hero{padding:52px 0 44px}
  .grid.c2,.grid.c3,.grid.c4{grid-template-columns:1fr}
  .stats .wrap{grid-template-columns:repeat(2,1fr)}
  .stats div{border-left:0;border-top:1px solid rgba(255,255,255,.12)}
  .stats div:nth-child(-n+2){border-top:0}
  .stats div:nth-child(even){border-left:1px solid rgba(255,255,255,.12)}
  .split{grid-template-columns:1fr;gap:24px}
  .row2{grid-template-columns:1fr}
  .pics{grid-template-columns:1fr 1fr;gap:10px}
  .gia-tri{grid-template-columns:1fr}
  .form-box{padding:20px}
  .btn{padding:11px 16px}
  .cta .btn{flex:1 1 auto}
  .el-user-btn{max-width:120px;padding:6px 10px}
  .ft-cols{grid-template-columns:1fr;gap:22px}
  .lop h3{font-size:22px}
}

/* Thuộc tính hidden phải thắng mọi display của .btn/.card (15/9: nút "Đăng nhập để bắt đầu" hiện dù hidden) */
[hidden]{display:none!important}