/* giao-dien.css — meocam.vn: biến màu, khung, thành phần. Một họ chữ: Plus Jakarta Sans. */
:root{
  --nen:#FFFBF5; --nen-2:#FBF1E6; --nen-3:#F4E5D3; --trang:#FFFFFF;
  --muc:#1C1A17; --muc-2:#4A453D; --muc-mo:#8A8378;
  --vien:#EBDFCF; --vien-dam:#D9C8B0;
  --cam:#E4661B; --cam-dam:#B94E10; --cam-mo:#FDEBDD; --cam-nhat:#FFF3E8;
  --dem:#1F2A3A; --dem-2:#2B3A50; --dem-chu:#F4EFE7; --dem-mo:#B8C0CC;
  --tot:#1F6F5B; --tot-mo:#E3F1EC;
  --chu:'Plus Jakarta Sans',system-ui,-apple-system,'Segoe UI',sans-serif;
  --bo:14px; --bo-nho:9px;
  --bong:0 1px 2px rgba(28,26,23,.06),0 12px 32px -18px rgba(28,26,23,.25);
  --khung:1120px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--nen);color:var(--muc);font-family:var(--chu);font-size:17px;line-height:1.6;font-variant-numeric:tabular-nums}
img,svg{max-width:100%;display:block}
a{color:var(--cam-dam)}
h1,h2,h3,h4{line-height:1.15;margin:0;letter-spacing:-.01em}
h1{font-size:clamp(2rem,5vw,3.35rem);font-weight:700}
h2{font-size:clamp(1.55rem,3.4vw,2.3rem);font-weight:700}
h3{font-size:1.25rem;font-weight:700}
p{margin:0 0 1em}
.khung{max-width:var(--khung);margin:0 auto;padding:0 20px}
.nho{font-size:.92rem}.mo{color:var(--muc-mo)}.dam{font-weight:700}
.so{font-variant-numeric:tabular-nums;letter-spacing:-.01em}
.an-mat{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}

/* Đầu trang */
.dau{position:sticky;top:0;z-index:20;background:rgba(255,251,245,.88);backdrop-filter:blur(10px);border-bottom:1px solid var(--vien)}
.dau .khung{display:flex;align-items:center;gap:22px;height:66px}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--muc);font-weight:700;font-size:1.15rem}
.logo svg{width:36px;height:36px}
.logo small{display:block;font-weight:500;font-size:.72rem;color:var(--muc-mo);letter-spacing:.06em;text-transform:uppercase;line-height:1}
.menu{margin-left:auto;display:flex;gap:6px;align-items:center}
.menu a{text-decoration:none;color:var(--muc-2);padding:8px 12px;border-radius:999px;font-weight:600;font-size:.95rem}
.menu a:hover{background:var(--cam-mo);color:var(--cam-dam)}
.menu .nut{padding:9px 16px}

/* Nút */
.nut{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 22px;border-radius:999px;font-weight:700;text-decoration:none;border:2px solid transparent;cursor:pointer;font-family:inherit;font-size:1rem;line-height:1.1;transition:transform .15s,box-shadow .15s,background .15s}
.nut:active{transform:translateY(1px)}
.nut-cam{background:var(--cam);color:#fff;box-shadow:0 8px 20px -10px rgba(228,102,27,.7)}
.nut-cam:hover{background:var(--cam-dam)}
.nut-vien{border-color:var(--vien-dam);color:var(--muc);background:transparent}
.nut-vien:hover{border-color:var(--cam);color:var(--cam-dam)}
.nut-dem{background:var(--dem);color:#fff}
.nut-dem:hover{background:var(--dem-2)}
.nut-trang{background:#fff;color:var(--dem);border-color:#fff}

/* Nhãn */
.nhan{display:inline-flex;align-items:center;gap:7px;padding:5px 12px;border-radius:999px;font-size:.8rem;font-weight:700;letter-spacing:.02em;background:var(--nen-2);color:var(--muc-2);border:1px solid var(--vien)}
.nhan.cam{background:var(--cam-mo);color:var(--cam-dam);border-color:#F6D2B8}
.nhan.tot{background:var(--tot-mo);color:var(--tot);border-color:#C9E4D9}
.nhan.dem{background:var(--dem);color:#fff;border-color:var(--dem)}
.cham{width:8px;height:8px;border-radius:50%;background:currentColor;display:inline-block}
.cham-dap{animation:dap 1.6s ease-in-out infinite}
@keyframes dap{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.45;transform:scale(.8)}}

/* Mở đầu */
.mo-dau{position:relative;overflow:hidden;padding:64px 0 40px}
.mo-dau::before{content:"";position:absolute;inset:0;background:
  radial-gradient(60% 50% at 85% 10%,rgba(228,102,27,.16),transparent 60%),
  radial-gradient(40% 40% at 10% 90%,rgba(31,42,58,.08),transparent 60%);pointer-events:none}
.mo-dau .khung{position:relative;display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:center}
.mo-dau h1 span{color:var(--cam)}
.mo-dau .dan{font-size:1.15rem;color:var(--muc-2);max-width:34em;margin-top:18px}
.md-nut{display:flex;flex-wrap:wrap;gap:12px;margin-top:26px}
.md-diem{display:flex;flex-wrap:wrap;gap:8px 22px;margin-top:26px;color:var(--muc-2);font-size:.95rem}
.md-diem span::before{content:"";display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--cam);margin-right:8px;vertical-align:middle}
.meo-lon{position:absolute;right:-40px;bottom:-60px;width:min(46vw,420px);opacity:.07;pointer-events:none}
.ve{display:grid;gap:16px}
.ve-the{background:var(--trang);border:1px solid var(--vien);border-radius:var(--bo);padding:20px 22px;box-shadow:var(--bong);text-decoration:none;color:inherit;display:grid;grid-template-columns:auto 1fr auto;gap:16px;align-items:center;transition:transform .2s,border-color .2s}
.ve-the:hover{transform:translateY(-3px);border-color:var(--cam)}
.ve-so{font-size:2rem;font-weight:700;color:var(--cam);line-height:1;width:44px}
.ve-the h3{font-size:1.1rem}
.ve-the .nho{margin-top:4px}
.ve-mui{color:var(--cam);font-size:1.4rem}

/* Khối chung */
.khoi{padding:72px 0}
.khoi-dem{background:var(--dem);color:var(--dem-chu)}
.khoi-dem h2,.khoi-dem h3{color:#fff}
.khoi-dem .mo{color:var(--dem-mo)}
.khoi-nen2{background:var(--nen-2)}
.tieu{max-width:44em;margin-bottom:36px}
.tieu .nhan{margin-bottom:14px}
.tieu p{color:var(--muc-2);font-size:1.08rem}
.khoi-dem .tieu p{color:var(--dem-mo)}

/* Thẻ khoá */
.khoa-hoc{display:grid;grid-template-columns:1fr 1fr;gap:26px}
.khoa{background:var(--trang);border:1px solid var(--vien);border-radius:18px;padding:30px;box-shadow:var(--bong);display:flex;flex-direction:column;gap:18px;position:relative;overflow:hidden}
.khoa::after{content:"";position:absolute;top:0;left:0;right:0;height:6px;background:var(--cam)}
.khoa.sap::after{background:var(--dem)}
.khoa-dau{display:flex;justify-content:space-between;align-items:flex-start;gap:12px}
.khoa h3{font-size:1.5rem}
.khoa .cho{color:var(--muc-2)}
.bac{display:grid;gap:8px;margin:4px 0}
.bac-hang{display:grid;grid-template-columns:auto 1fr auto;gap:12px;align-items:baseline;padding:10px 12px;border:1px solid var(--vien);border-radius:var(--bo-nho);background:var(--nen)}
.bac-hang b{color:var(--cam-dam);white-space:nowrap}
.bac-hang .nho{color:var(--muc-mo)}
.bac-hang .gia{font-weight:700;white-space:nowrap}
.khoa .nut-cum{display:flex;flex-wrap:wrap;gap:10px;margin-top:auto}
.khoa ul{margin:0;padding-left:0;list-style:none;display:grid;gap:8px;color:var(--muc-2)}
.khoa ul li{padding-left:24px;position:relative}
.khoa ul li::before{content:"✓";position:absolute;left:0;color:var(--tot);font-weight:700}
.khoa.sap ul li::before{content:"→";color:var(--cam)}

/* Cách học */
.luoi-3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.o{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);border-radius:var(--bo);padding:24px}
.o .so-to{font-size:2.4rem;font-weight:700;color:var(--cam);line-height:1;margin-bottom:10px}
.o p{color:var(--dem-mo);margin:8px 0 0;font-size:.98rem}

/* Chương trình khoá 2 */
.tuan{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.tuan-cot{background:var(--trang);border:1px solid var(--vien);border-radius:var(--bo);padding:24px}
.tuan-cot h3{display:flex;align-items:center;gap:10px;margin-bottom:14px}
.tuan-cot ol{margin:0;padding-left:0;list-style:none;display:grid;gap:10px}
.tuan-cot li{display:grid;grid-template-columns:auto 1fr;gap:12px;padding:10px 0;border-top:1px solid var(--vien)}
.tuan-cot li b{color:var(--cam-dam);font-size:.85rem;letter-spacing:.04em;padding-top:2px}
.tuan-cot li span{color:var(--muc-2);font-size:.97rem}
.can-cu{margin-top:26px;background:var(--cam-nhat);border:1px solid #F6D2B8;border-radius:var(--bo);padding:20px 24px;display:grid;grid-template-columns:auto 1fr;gap:16px;align-items:start}
.can-cu svg{width:28px;height:28px;color:var(--cam)}
.can-cu p{margin:0;color:var(--muc-2);font-size:.97rem}

/* Giảng viên */
.gv{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.gv-the{display:grid;grid-template-columns:auto 1fr;gap:18px;align-items:start;background:var(--trang);border:1px solid var(--vien);border-radius:var(--bo);padding:22px}
.gv-chu{width:60px;height:60px;border-radius:50%;background:var(--dem);color:#fff;display:grid;place-items:center;font-weight:700;font-size:1.2rem}
.gv-the p{margin:6px 0 0;color:var(--muc-2);font-size:.97rem}

/* Hỏi đáp */
.hd{max-width:780px}
.hd details{border-top:1px solid var(--vien);padding:4px 0}
.hd details:last-child{border-bottom:1px solid var(--vien)}
.hd summary{cursor:pointer;font-weight:700;padding:14px 0;list-style:none;display:flex;justify-content:space-between;gap:16px}
.hd summary::-webkit-details-marker{display:none}
.hd summary::after{content:"+";color:var(--cam);font-size:1.4rem;line-height:1}
.hd details[open] summary::after{content:"−"}
.hd details p{color:var(--muc-2);margin:0 0 16px}

/* Đăng ký */
.dk{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:start}
.form{background:var(--trang);border:1px solid var(--vien);border-radius:18px;padding:28px;box-shadow:var(--bong)}
.form label{display:block;font-weight:600;font-size:.92rem;margin:14px 0 6px}
.form label:first-of-type{margin-top:0}
.form input,.form select,.form textarea{width:100%;font:inherit;padding:12px 14px;border:1.5px solid var(--vien-dam);border-radius:10px;background:var(--nen);color:var(--muc)}
.form input:focus,.form select:focus,.form textarea:focus{outline:none;border-color:var(--cam);box-shadow:0 0 0 3px var(--cam-mo)}
.form textarea{min-height:88px;resize:vertical}
.form .nut{width:100%;margin-top:18px}
.form .bao{margin-top:12px;font-size:.95rem;min-height:1.4em}
.form .bao.loi{color:#B0431F}.form .bao.xong{color:var(--tot);font-weight:600}
.dk-lien{display:grid;gap:10px;margin-top:20px}
.dk-lien a{display:flex;gap:10px;align-items:center;text-decoration:none;color:var(--muc);font-weight:600}

/* Chân */
.chan{padding:40px 0 30px;border-top:1px solid var(--vien);color:var(--muc-mo);font-size:.92rem}
.chan .khung{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:28px}
.chan h4{color:var(--muc);font-size:.95rem;margin-bottom:10px}
.chan a{color:var(--muc-2);text-decoration:none;display:block;margin:4px 0}
.chan a:hover{color:var(--cam-dam)}
.chan .ban-quyen{grid-column:1/-1;border-top:1px solid var(--vien);padding-top:16px;margin-top:8px}

/* Hiện dần */
.hien{opacity:0;transform:translateY(14px);transition:opacity .6s ease,transform .6s ease}
.hien.da{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.hien{opacity:1;transform:none;transition:none}.cham-dap{animation:none}}

/* Điện thoại */
@media (max-width:900px){
  .mo-dau .khung{grid-template-columns:1fr;gap:30px}
  .khoa-hoc,.luoi-3,.tuan,.gv,.dk{grid-template-columns:1fr}
  .chan .khung{grid-template-columns:1fr}
  .menu a:not(.nut){display:none}
  .meo-lon{display:none}
  .khoi{padding:54px 0}
}
@media (max-width:520px){
  body{font-size:16px}
  .khoa{padding:22px}
  .bac-hang{grid-template-columns:1fr;gap:2px}
  .ve-the{grid-template-columns:auto 1fr}
  .ve-mui{display:none}
}