/* ABC E-Learning – giao diện web (elearning.abctalent.edu.vn), cùng kiểu "kính" sáng với ứng dụng ABC E-Learning / ABC Teacher
 * (ios/SayOnline/Chung/GiaoDien.swift): nền trường chuyển sắc kem → hồng phấn, thẻ kính mờ, nút chính viên thuốc cam → hồng sen
 * (mỗi màn một nút chính), chữ Quicksand. Bảng màu ABC Talent: Cam #F37053, Hồng #F58F99, Hồng sen #F05A94 (màu chính),
 * chữ #131313 / #656565, kem #F7F6F1, xanh ABC #1B6E53. Chỉ giao diện sáng. Mọi màu lấy từ biến trong :root dưới đây. */
@font-face { font-family: "Quicksand"; src: url("../fonts/Quicksand-Medium.woff2") format("woff2"); font-weight: 500; font-display: swap; }
@font-face { font-family: "Quicksand"; src: url("../fonts/Quicksand-SemiBold.woff2") format("woff2"); font-weight: 600; font-display: swap; }
@font-face { font-family: "Quicksand"; src: url("../fonts/Quicksand-Bold.woff2") format("woff2"); font-weight: 700; font-display: swap; }

:root {
  /* bảng màu ABC Talent */
  --abc-cam: #F37053; --abc-hong: #F58F99; --abc-hong-sen: #F05A94; --abc-den: #131313; --abc-xam: #656565;
  --abc-kem: #F7F6F1; --abc-xanh: #1B6E53;
  /* vai trò */
  --nen: var(--abc-kem);
  --nen-truong: radial-gradient(70% 55% at 0% 0%, rgba(243, 112, 83, .10), transparent 70%),
                radial-gradient(70% 60% at 100% 100%, rgba(240, 90, 148, .08), transparent 70%),
                linear-gradient(180deg, #F7F6F1 0%, #FFF1F0 55%, #FDE7EC 100%);
  --mat: rgba(255, 255, 255, .76); --mat-2: rgba(255, 255, 255, .55); --mat-dac: #FFFBFA;
  --anh-kinh: linear-gradient(135deg, rgba(255, 255, 255, .55) 0%, rgba(255, 255, 255, .12) 40%, rgba(255, 255, 255, 0) 65%);
  --vien: rgba(58, 24, 48, .09); --vien-dam: rgba(58, 24, 48, .18); --vanh: rgba(255, 255, 255, .9);
  --bong: 0 10px 30px -14px rgba(58, 24, 48, .28); --bong-noi: 0 18px 44px -16px rgba(58, 24, 48, .34);
  --chu: var(--abc-den); --chu-2: var(--abc-xam); --chu-3: #7C7476; --tieu-de: var(--abc-den);
  --nhan: #C7366F;                                  /* chữ nhấn hồng sen đậm (đủ tương phản trên nền sáng) */
  --nhan-nhat: rgba(240, 90, 148, .12); --nhan-vien: rgba(240, 90, 148, .35);
  --cta: linear-gradient(90deg, var(--abc-cam) 0%, var(--abc-hong-sen) 62%, #E0457F 100%);
  --cta-bong: 0 10px 22px -10px rgba(240, 90, 148, .65);
  --lien-ket: #C7366F;
  --tot: var(--abc-xanh); --tot-nen: rgba(27, 110, 83, .14);
  --canh-bao: #9A4306; --canh-bao-nen: rgba(243, 112, 83, .16);
  --loi: #B8123F; --loi-nen: rgba(224, 35, 78, .12);
  --vang: #7A5600; --vang-nen: rgba(255, 201, 40, .22); --sao: #F5A524;
  --r: 24px; --r-sm: 16px;
  --chu-de: "Quicksand", -apple-system, system-ui, "Segoe UI", sans-serif;
  --chu-than: "Quicksand", -apple-system, system-ui, "Segoe UI", sans-serif;
  /* tên cũ (Say Piano) – trỏ về bảng màu ABC để mã cũ không lệch màu */
  --sm-dem: var(--abc-den); --sm-khoi: var(--nhan); --sm-hong: var(--abc-hong-sen); --sm-hong-kem: var(--nhan-nhat);
  --sm-vang: #FFC928; --sm-cam: var(--abc-cam); --sm-ngoc: var(--abc-hong); --sm-oai: rgba(245, 143, 153, .14);
  --sm-hong-dam: var(--abc-hong-sen); --sm-hong-sau: var(--nhan); --sm-vang-chu: var(--vang); --sm-vang-nhat: var(--vang-nen);
  --sm-ngoc-chu: var(--nhan); --oai: var(--sm-oai); --vien-3d: var(--vien); --vien-3d-day: var(--vien-dam);
  --abc-hong-dam: var(--abc-hong-sen); --abc-hong-nhat: var(--nhan-nhat); --abc-hong-vien: var(--nhan-vien);
  --chuyen-hong: var(--cta); --chuyen-say: var(--mat);
  color-scheme: light;
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body { font: 500 16px/1.55 var(--chu-than); color: var(--chu); background: var(--nen); -webkit-font-smoothing: antialiased; }
a { color: var(--lien-ket); text-decoration: none; }
a:hover { text-decoration: underline; }
button, input, select, textarea { font: inherit; color: inherit; }
h1, h2, h3 { font-family: var(--chu-de); font-weight: 700; color: var(--tieu-de); letter-spacing: .005em; text-wrap: balance; margin: 0; }
h1 { font-size: clamp(30px, 4.4vw, 46px); line-height: 1.1; }
h2 { font-size: 24px; line-height: 1.2; }
h3 { font-size: 18px; }
p { text-wrap: pretty; }
.mo { color: var(--chu-3); }
.phu { color: var(--chu-2); }
.an { display: none !important; }
:focus-visible { outline: 3px solid rgba(199, 54, 111, .55); outline-offset: 2px; border-radius: 8px; }

/* ---------- thanh trên ---------- */
.dau { position: sticky; top: 0; z-index: 30; background: color-mix(in srgb, var(--nen) 82%, transparent);
  -webkit-backdrop-filter: saturate(180%) blur(18px); backdrop-filter: saturate(180%) blur(18px); border-bottom: .5px solid var(--vien); }
.dau__trong { max-width: 1200px; margin: 0 auto; padding: 10px 16px; display: flex; align-items: center; gap: 14px; }
.dau__logo { display: flex; align-items: center; gap: 10px; text-decoration: none !important; }
.dau__logo img { height: 34px; width: auto; display: block; }
.dau__nhan { font: 700 15px var(--chu-de); color: var(--sm-dem); background: var(--sm-oai); padding: 3px 10px; border-radius: 999px; }
.dau__menu { margin-left: auto; display: flex; align-items: center; gap: 4px; flex-wrap: wrap; justify-content: flex-end; }
.dau__menu a { color: var(--chu-2); font-weight: 600; font-size: 15px; padding: 8px 12px; border-radius: 10px; }
.dau__menu a:hover { background: var(--nhan-nhat); text-decoration: none; color: var(--tieu-de); }
.dau__menu a.dang-o { color: var(--tieu-de); background: var(--nhan-nhat); }
.dau__logo img.logo-trang { display: none; }
main { max-width: 1200px; margin: 0 auto; padding: 24px 16px 80px; }

/* ---------- nút: một hệ duy nhất ---------- */
.nut { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 44px; padding: 0 20px; border-radius: 12px;
  border: 1.5px solid var(--vien-dam); background: var(--mat); color: var(--nhan); font: 700 17px var(--chu-de); letter-spacing: .01em;
  cursor: pointer; text-decoration: none !important; white-space: nowrap; transition: background .15s, transform .05s; }
.nut:hover { background: var(--nhan-nhat); }
.nut:active { transform: translateY(1px); }
.nut[disabled] { opacity: .5; cursor: not-allowed; }
.nut--chinh { background: var(--cta); border-color: transparent; color: #fff; }
.nut--chinh:hover { background: var(--cta-hover); border-color: var(--cta-hover); }
.nut--nhe { border-color: transparent; background: transparent; }
.nut--nho { min-height: 36px; padding: 0 14px; font-size: 15px; border-radius: 10px; }
.nut--rong { width: 100%; }
.nut--nguy { color: var(--loi); }

/* ---------- ô nhập ---------- */
.o { width: 100%; min-height: 44px; padding: 10px 14px; border-radius: 12px; border: 1.5px solid var(--vien-dam); background: var(--mat); font-weight: 600; }
textarea.o { min-height: 96px; resize: vertical; line-height: 1.5; }
.nhan-o { display: block; font-weight: 700; font-size: 14px; color: var(--chu-2); margin: 14px 0 6px; }
.goi-y { font-size: 13px; color: var(--chu-3); margin-top: 4px; }

/* ---------- thẻ ---------- */
.the { background: var(--mat); border-radius: var(--r); box-shadow: var(--bong); border: .5px solid var(--vien); padding: 20px; }
.chip { display: inline-flex; align-items: center; gap: 4px; padding: 3px 10px; border-radius: 999px; font-size: 13px; font-weight: 700;
  background: var(--nhan-nhat); color: var(--nhan); white-space: nowrap; }
.chip--vang { background: var(--sm-vang-nhat); color: var(--sm-vang-chu); }
.chip--tot { background: var(--tot-nen); color: var(--tot); }
.chip--canh-bao { background: var(--canh-bao-nen); color: var(--canh-bao); }
.chip--loi { background: var(--loi-nen); color: var(--loi); }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }

/* ---------- đầu trang tìm giáo viên ---------- */
.mo-dau { display: grid; grid-template-columns: 1.2fr 1fr; gap: 32px; align-items: center; padding: 20px 0 28px; }
.mo-dau p { font-size: 18px; color: var(--chu-2); margin: 14px 0 0; max-width: 560px; }
.cam-ket { display: grid; gap: 10px; }
.cam-ket__muc { display: flex; gap: 12px; align-items: flex-start; background: var(--mat); border-radius: var(--r-sm); padding: 14px 16px; border: .5px solid var(--vien); }
.cam-ket__so { flex: none; width: 32px; height: 32px; border-radius: 10px; display: grid; place-items: center; font: 700 17px var(--chu-de);
  background: var(--sm-oai); color: var(--sm-dem); }
.cam-ket__muc b { display: block; color: var(--tieu-de); }
.cam-ket__muc span { font-size: 14px; color: var(--chu-2); }
@media (max-width: 860px) { .mo-dau { grid-template-columns: 1fr; gap: 18px; } }

.bo-loc { display: flex; flex-wrap: wrap; gap: 10px; align-items: end; padding: 14px; background: var(--mat); border-radius: var(--r); border: .5px solid var(--vien);
  position: sticky; top: 58px; z-index: 10; box-shadow: var(--bong); }
.bo-loc label { display: grid; gap: 4px; font-size: 13px; font-weight: 700; color: var(--chu-3); flex: 1 1 160px; }
.bo-loc select { min-height: 40px; border-radius: 10px; border: 1.5px solid var(--vien-dam); background: var(--mat); padding: 0 10px; font-weight: 600; color: var(--chu); }
.dem-kq { margin: 18px 4px 10px; font-weight: 700; color: var(--chu-2); }

/* ---------- thẻ giáo viên trong danh sách ---------- */
.ds-gia-su { display: grid; gap: 16px; }
.the-gs { display: grid; grid-template-columns: 132px 1fr 220px; gap: 20px; padding: 20px; background: var(--mat); border-radius: var(--r);
  border: .5px solid var(--vien); box-shadow: var(--bong); }
.the-gs__anh { width: 132px; height: 132px; border-radius: 16px; object-fit: cover; display: block; background: var(--sm-oai); }
.the-gs__ten { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.the-gs__ten h3 { font-size: 22px; }
.the-gs__ten a { color: inherit; }
.the-gs__tieu-de { font-weight: 700; color: var(--chu); margin: 4px 0 8px; }
.the-gs__mo-ta { color: var(--chu-2); font-size: 15px; margin: 10px 0 0; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.the-gs__so { display: flex; gap: 18px; margin-top: 10px; font-size: 14px; color: var(--chu-2); }
.the-gs__so b { color: var(--tieu-de); font-family: var(--chu-de); font-weight: 700; font-size: 17px; }
.the-gs__ben { display: flex; flex-direction: column; gap: 10px; }
.gia { font: 700 26px var(--chu-de); color: var(--tieu-de); line-height: 1; }
.gia small { font: 600 13px var(--chu-than); color: var(--chu-3); display: block; margin-top: 4px; }
@media (max-width: 860px) {
  .the-gs { grid-template-columns: 88px 1fr; }
  .the-gs__anh { width: 88px; height: 88px; }
  .the-gs__ben { grid-column: 1 / -1; flex-direction: row; flex-wrap: wrap; align-items: center; }
  .the-gs__ben .gia { flex-basis: 100%; }
  .the-gs__ben .nut { flex: 1 1 0; }
}

.anh-chu { display: grid; place-items: center; color: #fff; font: 700 40px var(--chu-de);
  background: linear-gradient(135deg, var(--sm-hong), var(--sm-khoi)); }

/* ---------- hồ sơ giáo viên ---------- */
.ho-so { display: grid; grid-template-columns: minmax(0, 1fr) 340px; gap: 28px; align-items: start; }
.ho-so > * { min-width: 0; }
.ho-so__dau { display: flex; gap: 20px; align-items: center; }
.ho-so__anh { width: 128px; height: 128px; border-radius: 20px; object-fit: cover; flex: none; }
.ho-so section { margin-top: 28px; }
.ho-so section h2 { margin-bottom: 10px; }
.van-ban { white-space: pre-line; color: var(--chu); }
.ben-dinh { position: sticky; top: 76px; display: grid; gap: 14px; }
.video { position: relative; aspect-ratio: 16 / 9; border-radius: var(--r); overflow: hidden; background: #000; }
.video iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
@media (max-width: 920px) { .ho-so { grid-template-columns: minmax(0, 1fr); } .ben-dinh { position: static; } .ho-so__anh { width: 96px; height: 96px; } }

/* lịch giờ trống kiểu Preply: 7 cột ngày, mỗi giờ một nút */
.lich__dieu-khien { display: flex; align-items: center; gap: 8px; margin-bottom: 12px; }
.lich__dieu-khien b { margin-right: auto; }
.lich { display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); gap: 6px; }
.lich__cot { display: grid; gap: 6px; align-content: start; }
.lich__ngay { text-align: center; padding: 6px 0 8px; border-bottom: 2px solid var(--vien); margin-bottom: 4px; }
.lich__ngay b { display: block; font: 700 15px var(--chu-de); color: var(--tieu-de); }
.lich__ngay span { font-size: 12px; color: var(--chu-3); }
.o-gio { border: 1.5px solid var(--vien-dam); background: var(--mat); border-radius: 9px; padding: 6px 0; font-weight: 700; font-size: 14px; cursor: pointer; color: var(--chu); }
.o-gio:hover { border-color: var(--nhan); color: var(--nhan); }
.o-gio.chon { background: var(--sm-khoi); color: #fff; border-color: var(--sm-khoi); }
.lich__trong { font-size: 12px; text-align: center; color: var(--chu-3); padding: 8px 0; }
@media (max-width: 600px) { .lich { grid-template-columns: repeat(7, 74px); overflow-x: auto; padding-bottom: 6px; } }

/* ---------- hộp thoại ---------- */
dialog.hop { border: 0; padding: 0; border-radius: 22px; width: min(520px, calc(100vw - 32px)); background: var(--mat); color: var(--chu);
  box-shadow: 0 24px 80px rgba(40, 20, 30, .35); }
dialog.hop::backdrop { background: rgba(40, 24, 32, .45); -webkit-backdrop-filter: blur(4px); backdrop-filter: blur(4px); }
.hop__than { padding: 24px; max-height: calc(100vh - 80px); overflow: auto; }
.hop__than h2 { margin-bottom: 6px; }
.hop__nut { display: flex; gap: 10px; justify-content: flex-end; margin-top: 20px; flex-wrap: wrap; }
.cong-ph__q { font: 700 40px var(--chu-de); color: var(--tieu-de); text-align: center; margin: 16px 0 10px; }
.cong-ph input { text-align: center; font: 700 28px var(--chu-de); }
.thong-bao-loi { color: var(--loi); font-weight: 700; min-height: 1.4em; margin: 8px 0 0; }

/* ---------- thanh toán ---------- */
.tt { display: grid; grid-template-columns: 300px 1fr; gap: 28px; align-items: start; max-width: 860px; margin: 0 auto; }
.tt__qr { width: 100%; border-radius: 16px; background: #fff; display: block; aspect-ratio: 1 / 1.1; object-fit: contain; }
.dong { display: flex; justify-content: space-between; gap: 12px; padding: 10px 0; border-bottom: .5px solid var(--vien); }
.dong:last-child { border-bottom: 0; }
.dong span { color: var(--chu-3); }
.dong b { text-align: right; }
.nut-chep { border: 0; background: var(--nhan-nhat); color: var(--nhan); border-radius: 8px; padding: 2px 8px; margin-left: 6px; cursor: pointer; font-weight: 700; font-size: 13px; }
@media (max-width: 760px) { .tt { grid-template-columns: 1fr; } .tt__qr { max-width: 320px; margin: 0 auto; } }

/* ---------- danh sách buổi học ---------- */
.ds-buoi { display: grid; gap: 12px; }
.buoi { display: grid; grid-template-columns: 76px 1fr auto; gap: 16px; align-items: center; padding: 16px; background: var(--mat); border-radius: var(--r);
  border: .5px solid var(--vien); }
.buoi__ngay { text-align: center; background: var(--sm-oai); color: var(--sm-dem); border-radius: 14px; padding: 8px 4px; }
.buoi__ngay b { display: block; font: 700 26px var(--chu-de); line-height: 1; }
.buoi__ngay span { font-size: 12px; font-weight: 700; }
.buoi__tieu-de { font-weight: 700; }
.buoi__nut { display: flex; gap: 8px; flex-wrap: wrap; justify-content: flex-end; }
@media (max-width: 700px) { .buoi { grid-template-columns: 64px 1fr; } .buoi__nut { grid-column: 1 / -1; justify-content: flex-start; } }

.bang-trong { text-align: center; padding: 48px 16px; color: var(--chu-2); }
.bang-trong h2 { margin-bottom: 8px; }

.loading { display: flex; justify-content: center; padding: 60px; }
.loading::after { content: ""; width: 26px; height: 26px; border-radius: 50%; border: 3px solid var(--nhan-nhat); border-top-color: var(--nhan); animation: quay .8s linear infinite; }
@keyframes quay { to { transform: rotate(360deg); } }

.toast { position: fixed; left: 50%; bottom: 24px; transform: translate(-50%, 20px); opacity: 0; background: var(--sm-dem); color: #fff; padding: 12px 18px;
  border-radius: 14px; font-weight: 700; z-index: 100; transition: .25s; pointer-events: none; max-width: calc(100vw - 32px); }
.toast.hien { opacity: 1; transform: translate(-50%, 0); }

/* ---------- khu làm việc giáo viên / vận hành (kiểu Apple như quan-tri.css) ---------- */
.khu { display: grid; grid-template-columns: 220px 1fr; gap: 24px; align-items: start; }
.khu__ben { position: sticky; top: 76px; display: grid; gap: 2px; }
.khu__ben button { text-align: left; border: 0; background: none; padding: 9px 12px; border-radius: 10px; font-weight: 700; color: var(--chu-2); cursor: pointer;
  display: flex; justify-content: space-between; align-items: center; }
.khu__ben button:hover { background: var(--nhan-nhat); }
.khu__ben button.dang-o { background: var(--sm-khoi); color: #fff; }
.khu__ben .dem { font-size: 12px; background: var(--cta); color: #fff; border-radius: 999px; padding: 1px 8px; }
.khu__noi h1 { font-size: 30px; margin-bottom: 18px; }
@media (max-width: 800px) {
  .khu { grid-template-columns: 1fr; }
  .khu__ben { position: static; display: flex; overflow-x: auto; gap: 6px; }
  .khu__ben button { white-space: nowrap; }
}
.luoi-so { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 12px; margin-bottom: 20px; }
.o-so { background: var(--mat); border: .5px solid var(--vien); border-radius: var(--r-sm); padding: 14px 16px; }
.o-so span { font-size: 13px; color: var(--chu-3); font-weight: 700; }
.o-so b { display: block; font: 700 28px var(--chu-de); color: var(--tieu-de); }
.bang { width: 100%; border-collapse: collapse; background: var(--mat); border-radius: var(--r-sm); overflow: hidden; border: .5px solid var(--vien); font-size: 14px; }
.bang th, .bang td { padding: 10px 12px; text-align: left; border-bottom: .5px solid var(--vien); vertical-align: top; }
.bang th { font-size: 12px; color: var(--chu-3); background: var(--mat-2); }
.bang tr:last-child td { border-bottom: 0; }
.bang .so { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
.cuon-ngang { overflow-x: auto; }
.hang-gio { display: grid; grid-template-columns: 110px 1fr; gap: 12px; align-items: start; padding: 12px 0; border-bottom: .5px solid var(--vien); }
.hang-gio__khung { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.khung { display: inline-flex; align-items: center; gap: 6px; background: var(--mat-2); border: 1px solid var(--vien); border-radius: 10px; padding: 4px 6px; }
.khung input { width: 96px; border: 0; background: transparent; font-weight: 700; }
.khung button { border: 0; background: none; cursor: pointer; color: var(--chu-3); font-size: 18px; line-height: 1; }
.luoi-form { display: grid; grid-template-columns: 1fr 1fr; gap: 0 16px; }
@media (max-width: 700px) { .luoi-form { grid-template-columns: 1fr; } .hang-gio { grid-template-columns: 1fr; } }
.chon-chip { display: flex; flex-wrap: wrap; gap: 8px; }
.chon-chip label { display: inline-flex; gap: 6px; align-items: center; border: 1.5px solid var(--vien-dam); border-radius: 999px; padding: 4px 12px; cursor: pointer; font-weight: 700; font-size: 14px; }
.chon-chip input { accent-color: var(--sm-khoi); }

/* ---------- điện thoại ---------- */
.dau__nhan { white-space: nowrap; }
.cam-ket__muc span, .goi-y, .phu, .the-gs__mo-ta { text-wrap: pretty; }
.cam-ket__muc span { display: block; }
@media (max-width: 700px) {
  .dau__trong { flex-wrap: wrap; gap: 6px 10px; padding: 8px 16px 6px; }
  .dau__menu { margin-left: 0; width: 100%; flex-wrap: nowrap; justify-content: flex-start; overflow-x: auto; scrollbar-width: none; }
  .dau__menu a { padding: 6px 10px; font-size: 14px; white-space: nowrap; }
  .bo-loc { position: static; }
  .bo-loc label { flex: 1 1 140px; }
  main { padding-top: 16px; }
}

/* =====================================================================
 * TRANG NỘI DUNG (trang chủ, Cách học, Trở thành giáo viên, Hỏi đáp, Chính sách) – học bố cục Preply, màu ABC E-Learning
 * ===================================================================== */
.trang-nd { max-width: 1120px; }
.trang-nd--hep { max-width: 820px; }
.nhan-tren { font: 700 13px var(--chu-than); letter-spacing: .06em; text-transform: uppercase; color: var(--nhan); margin: 0 0 10px; }
.phu.lon { font-size: 18px; line-height: 1.6; }
.hep { max-width: 640px; }
.nut--lon { min-height: 52px; padding: 0 28px; font-size: 19px; border-radius: 14px; }
.nut--phu { background: var(--sm-khoi); border-color: var(--sm-khoi); color: #fff; }
.nut--phu:hover { background: var(--sm-dem); border-color: var(--sm-dem); }
.nut--sang { background: #fff; border-color: #fff; color: var(--sm-dem); }
.nut--sang:hover { background: var(--sm-oai); }
.lien-ket-mui { font-weight: 700; color: var(--nhan); }
.lien-ket-mui::after { content: " ›"; }
.ghi-chu { margin-top: 18px; color: var(--chu-2); }
.khoi { margin: 72px 0; }
.khoi > h2, .dau-khoi h2 { font-size: clamp(26px, 3.2vw, 34px); margin-bottom: 14px; }
.khoi--nen { background: var(--mat); border-radius: 28px; padding: 44px clamp(20px, 4vw, 48px); border: .5px solid var(--vien); }
.khoi--cuoi { text-align: center; display: grid; justify-items: center; gap: 6px; padding: 8px 0 24px; }
.khoi--cuoi .phu { margin: 0 0 14px; }
.dau-khoi { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; flex-wrap: wrap; }

/* hero */
.hero { display: grid; grid-template-columns: 1.1fr 1fr; gap: 48px; align-items: center; padding: 36px 0 12px; }
.hero h1 { font-size: clamp(34px, 5vw, 56px); }
.hero__mo-ta { font-size: 19px; line-height: 1.6; color: var(--chu-2); margin: 18px 0 26px; max-width: 560px; }
.hero__nut { display: flex; align-items: center; gap: 22px; flex-wrap: wrap; }
.hero__cam-ket { list-style: none; padding: 0; margin: 28px 0 0; display: flex; flex-wrap: wrap; gap: 8px 18px; color: var(--chu-2); font-weight: 600; font-size: 15px; }
.hero__cam-ket li::before { content: "✓"; color: var(--tot); font-weight: 800; margin-right: 6px; }

/* hình minh hoạ phòng học (dựng bằng HTML) */
.mo-phong { background: var(--mat); border-radius: 24px; border: .5px solid var(--vien); box-shadow: 0 30px 80px -30px rgba(58, 24, 48, .30); overflow: hidden; }
.mo-phong__thanh { display: flex; align-items: center; gap: 6px; padding: 12px 16px; background: var(--sm-dem); color: #fff; }
.mo-phong__thanh span { width: 10px; height: 10px; border-radius: 50%; background: rgba(255, 255, 255, .35); }
.mo-phong__thanh b { margin-left: 8px; font: 700 15px var(--chu-de); }
.mo-phong__than { padding: 22px; display: grid; gap: 16px; }
.mo-phong__dau { display: flex; align-items: center; gap: 10px; }
.mo-phong__dau b { font: 700 20px var(--chu-de); color: var(--tieu-de); }
.mo-phong__dong { display: grid; gap: 8px; }
.mo-phong__dong i { display: block; height: 10px; border-radius: 6px; background: var(--sm-oai); }
.mo-phong__the { display: flex; gap: 8px; flex-wrap: wrap; }
.mo-phong__ai { font-size: 13px; font-weight: 700; padding: 5px 12px; border-radius: 999px; }
.mo-phong__ai--gs { background: rgba(245, 143, 152, .14); color: var(--sm-ngoc-chu); }
.mo-phong__ai--hv { background: var(--sm-hong-kem); color: var(--sm-hong-sau); }
.mo-phong__phim { position: relative; display: flex; height: 110px; border-radius: 12px; overflow: hidden; border: 1.5px solid var(--vien-dam); background: #fff; }
.mo-phong__phim i { flex: 1; border-right: 1px solid rgba(58, 24, 48, .14); }
.mo-phong__phim i:last-of-type { border-right: 0; }
.mo-phong__phim i.den { position: absolute; top: 0; width: 7%; height: 62%; background: var(--sm-dem); border-radius: 0 0 6px 6px; border: 0; }
.mo-phong__phim i.sang-gs { background: linear-gradient(#fff, var(--sm-ngoc) 160%); }
.mo-phong__phim i.sang-hv { background: linear-gradient(#fff, var(--sm-hong) 160%); }
/* bước */
.buoc { list-style: none; padding: 0; margin: 28px 0 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.buoc li { background: var(--mat); border-radius: var(--r); border: .5px solid var(--vien); padding: 24px; }
.buoc h3 { font-size: 21px; margin: 14px 0 8px; }
.buoc p { margin: 0; color: var(--chu-2); }
.buoc__so { display: grid; place-items: center; width: 40px; height: 40px; border-radius: 12px; background: var(--sm-oai); color: var(--sm-dem); font: 700 20px var(--chu-de); }
.buoc-dai { list-style: none; padding: 0; margin: 0; display: grid; gap: 28px; }
.buoc-dai > li { display: grid; grid-template-columns: 48px 1fr; gap: 18px; }
.buoc-dai h2 { font-size: 26px; margin-bottom: 8px; }
.buoc-dai p { color: var(--chu-2); margin: 0 0 10px; }

.hai-cot { display: grid; grid-template-columns: 1fr 1.1fr; gap: 40px; align-items: start; }
.hai-cot--deu { grid-template-columns: 1fr 1fr; }
.loi-ich { list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; }
.loi-ich li { display: grid; gap: 2px; padding: 16px 18px; border-radius: var(--r-sm); background: var(--nen); }
.loi-ich b { color: var(--tieu-de); }
.loi-ich span { color: var(--chu-2); font-size: 15px; }

/* giáo trình */
.gt-luoi { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 24px; }
.gt-the { background: var(--mat); border-radius: var(--r); border: .5px solid var(--vien); padding: 24px; }
.gt-the h3 { font-size: 22px; margin-bottom: 12px; }
.gt-the ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; }
.gt-the li { display: grid; gap: 2px; padding-left: 14px; border-left: 3px solid var(--sm-oai); }
.gt-the b { color: var(--tieu-de); }
.gt-the span { color: var(--chu-2); font-size: 15px; }

/* giáo viên nổi bật */
.gs-noi-bat { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 16px; }
.gs-nho { display: grid; gap: 10px; align-content: start; background: var(--mat); border-radius: var(--r); border: .5px solid var(--vien); padding: 20px; color: var(--chu); }
.gs-nho:hover { text-decoration: none; border-color: var(--nhan); }
.gs-nho__anh { width: 72px; height: 72px; border-radius: 18px; object-fit: cover; }
.gs-nho > div { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.gs-nho b { font: 700 19px var(--chu-de); color: var(--tieu-de); }
.gs-nho p { margin: 0; color: var(--chu-2); font-size: 15px; }
.gs-nho__gia { font-weight: 700; color: var(--chu); }

/* bảo đảm, mời giáo viên */
.bao-dam { display: flex; justify-content: space-between; align-items: center; gap: 24px; flex-wrap: wrap; background: var(--sm-oai); border-radius: 28px; padding: 32px clamp(20px, 4vw, 44px); }
.bao-dam h2 { color: var(--sm-dem); font-size: clamp(24px, 3vw, 30px); margin-bottom: 8px; }
.bao-dam p { margin: 0; max-width: 680px; color: var(--chu-2); }
.bao-dam .lien-ket-mui { color: var(--sm-dem); }
.moi-gs { display: flex; justify-content: space-between; align-items: center; gap: 24px; flex-wrap: wrap; background: var(--sm-dem); color: #fff; border-radius: 28px; padding: 36px clamp(20px, 4vw, 48px); }
.moi-gs h2 { color: #fff; font-size: clamp(26px, 3.2vw, 34px); margin-bottom: 8px; }
.moi-gs p { margin: 0; max-width: 640px; color: rgba(255, 255, 255, .82); }

.luoi-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 20px; }
.o-y { background: var(--mat); border-radius: var(--r); border: .5px solid var(--vien); padding: 22px; }
.khoi--nen .o-y { background: var(--nen); border: 0; }
.o-y h3 { font-size: 18px; margin-bottom: 8px; }
.o-y p { margin: 0; color: var(--chu-2); font-size: 15px; }
.o-y--nhat { background: var(--sm-oai); border: 0; }
.o-y--nhat h3 { color: var(--sm-dem); }
.o-y--nhat p { color: var(--chu-2); }

/* danh sách, hỏi đáp */
.danh-sach { padding-left: 20px; margin: 10px 0 0; display: grid; gap: 8px; color: var(--chu-2); }
.danh-sach.lon { font-size: 17px; }
.danh-sach b { color: var(--chu); }
.hoi-dap { display: grid; gap: 10px; margin-top: 18px; }
.hoi-dap details { background: var(--mat); border-radius: var(--r-sm); border: .5px solid var(--vien); }
.hoi-dap summary { list-style: none; cursor: pointer; padding: 16px 52px 16px 20px; font-weight: 700; color: var(--tieu-de); position: relative; }
.hoi-dap summary::-webkit-details-marker { display: none; }
.hoi-dap summary::after { content: "+"; position: absolute; right: 20px; top: 50%; transform: translateY(-50%); font: 700 24px var(--chu-de); color: var(--nhan); }
.hoi-dap details[open] summary::after { content: "−"; }
.hoi-dap details p { margin: 0; padding: 0 20px 18px; color: var(--chu-2); }

/* đầu trang con */
.dau-trang { text-align: center; display: grid; justify-items: center; gap: 4px; padding: 40px 0 8px; }
.dau-trang h1 { max-width: 820px; }
.dau-trang .phu { max-width: 680px; margin: 10px 0 22px; }
.dau-trang--trai { text-align: left; justify-items: start; }
.muc-luc { display: flex; flex-wrap: wrap; gap: 8px; }
.muc-luc a { padding: 6px 14px; border-radius: 999px; background: var(--mat); border: .5px solid var(--vien); font-weight: 700; font-size: 14px; color: var(--chu-2); }
.khoi-hd { margin: 44px 0; scroll-margin-top: 80px; }
.khoi-hd h2 { font-size: 26px; }
.tim-dau { padding: 12px 0 18px; }
.tim-dau .phu { margin: 8px 0 0; font-size: 17px; }

/* bậc giáo viên, đơn ứng tuyển */
.bac-ds { list-style: none; padding: 0; margin: 14px 0 0; display: grid; gap: 10px; }
.bac-ds li { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; padding: 14px 18px; border-radius: var(--r-sm); background: var(--mat); border: .5px solid var(--vien); }
.bac-ds b { font: 700 18px var(--chu-de); color: var(--tieu-de); }
.bac-ds span { color: var(--chu-2); }
.don-khung { display: grid; grid-template-columns: 1fr 1.6fr; gap: 36px; align-items: start; scroll-margin-top: 80px; }
.don-gioi-thieu h2 { font-size: clamp(26px, 3.2vw, 34px); margin-bottom: 10px; }
.don { padding: 26px; }
.don .nhan-o { margin-top: 12px; }
.don .nhan-o .o { margin-top: 6px; font-weight: 600; }
.chon-nhieu { border: 0; padding: 0; margin: 0; }
.chip-chon { display: inline-flex; align-items: center; cursor: pointer; }
.chip-chon input { position: absolute; opacity: 0; pointer-events: none; }
.chip-chon span { padding: 6px 14px; border-radius: 999px; border: 1.5px solid var(--vien-dam); font-weight: 700; font-size: 14px; color: var(--chu-2); }
.chip-chon input:checked + span { background: var(--nhan-nhat); border-color: var(--nhan); color: var(--tieu-de); }
.chip-chon input:focus-visible + span { outline: 3px solid rgba(199, 54, 111, .55); outline-offset: 2px; }
.an-bay { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.dong-y { display: flex; gap: 10px; align-items: flex-start; margin: 18px 0 4px; font-size: 14px; color: var(--chu-2); }
.dong-y input { margin-top: 3px; accent-color: var(--sm-khoi); width: 18px; height: 18px; flex: none; }
.don-xong { text-align: center; padding: 30px 10px; }
.don-xong h3 { font-size: 24px; margin-bottom: 8px; }

/* văn bản dài (chính sách) */
.van-ban-dai h1 { margin: 24px 0 8px; }
.van-ban-dai h2 { font-size: 22px; margin: 34px 0 10px; scroll-margin-top: 80px; }
.van-ban-dai ul { padding-left: 20px; display: grid; gap: 8px; color: var(--chu-2); }
.van-ban-dai p { color: var(--chu-2); }

/* chân trang */
.chan { background: var(--sm-dem); color: rgba(255, 255, 255, .78); margin-top: 40px; padding: 48px 16px 28px; }
.chan__trong { max-width: 1120px; margin: 0 auto; display: grid; grid-template-columns: 1.3fr 1fr 1fr 1.2fr; gap: 28px; }
.chan__thuong-hieu p { margin: 12px 0 0; max-width: 260px; font-size: 15px; }
.chan h3 { color: #fff; font-size: 16px; margin-bottom: 10px; }
.chan ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.chan a { color: rgba(255, 255, 255, .86); font-size: 15px; }
.chan a:hover { color: #fff; }
.chan__cuoi { max-width: 1120px; margin: 36px auto 0; padding-top: 18px; border-top: 1px solid rgba(255, 255, 255, .14); font-size: 13px; color: rgba(255, 255, 255, .6); }

@media (max-width: 900px) {
  .hero, .hai-cot, .hai-cot--deu, .gt-luoi, .don-khung { grid-template-columns: 1fr; }
  .hero { gap: 28px; }
  .buoc, .luoi-3, .gs-noi-bat { grid-template-columns: 1fr; }
  .chan__trong { grid-template-columns: 1fr 1fr; }
  .khoi { margin: 52px 0; }
}
@media (max-width: 560px) {
  .chan__trong { grid-template-columns: 1fr; }
  .hero__mo-ta, .phu.lon { font-size: 17px; }
  .buoc-dai > li { grid-template-columns: 1fr; gap: 10px; }
  .khoi--nen, .bao-dam, .moi-gs { border-radius: 22px; }
}
.ds-don { display: grid; gap: 12px; }
.don-vh__dau { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.don-vh__dau b { font: 700 18px var(--chu-de); color: var(--tieu-de); }

/* gói học */
.ds-goi { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 12px; }
.goi { display: grid; gap: 8px; padding: 18px; background: var(--mat); border-radius: var(--r); border: .5px solid var(--vien); }
.goi--mo { opacity: .7; }
.goi__dau { display: flex; justify-content: space-between; gap: 8px; align-items: center; flex-wrap: wrap; }
.goi__dau b { font: 700 18px var(--chu-de); color: var(--tieu-de); }
.goi__so { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin: 4px 0; }
.goi__so div { background: var(--mat-2); border-radius: 12px; padding: 8px 10px; display: grid; }
.goi__so b { font: 700 22px var(--chu-de); color: var(--tieu-de); }
.goi__so span { font-size: 12px; color: var(--chu-3); font-weight: 700; }
.goi__so .goi__gap { background: var(--canh-bao-nen); }
.goi__so .goi__gap b { color: var(--canh-bao); }
.goi__nhac { color: var(--canh-bao); font-weight: 700; }
.goi .buoi__nut { justify-content: flex-start; }
@media (max-width: 460px) { .goi__so { grid-template-columns: 1fr 1fr; } }
.chon-goi { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.chon-goi .nut { flex-direction: column; gap: 0; min-height: 60px; padding: 6px 10px; }
.chon-goi small { font: 600 12px var(--chu-than); color: var(--chu-3); }


/* =====================================================================
 * THANH TRÊN: logo · liên kết trang · khối tài khoản bên phải (bố cục; màu ở lớp kính cuối tệp)
 * ===================================================================== */
.dau__trong { max-width: 1200px; gap: 18px; }
.dau__logo { gap: 10px; flex: none; }
.dau__menu { margin-left: 8px; flex: 1; justify-content: flex-start; flex-wrap: nowrap; gap: 2px; }
.dau__menu a { white-space: nowrap; }
.dau__ben { display: flex; align-items: center; gap: 12px; flex: none; }
.tai-khoan { display: flex; align-items: center; gap: 8px; padding: 4px; border-radius: 999px; }
.tai-khoan__chu { width: 34px; height: 34px; border-radius: 50%; display: grid; place-items: center; font: 700 16px var(--chu-de); color: #fff;
  background: linear-gradient(135deg, var(--abc-cam), var(--abc-hong-sen)); }
.nut-ra { display: inline-flex; align-items: center; gap: 6px; border: 0; background: transparent; color: var(--chu); font: 700 14px var(--chu-than);
  min-height: 36px; padding: 0 12px; border-radius: 999px; cursor: pointer; }
.nut-ra:hover { background: var(--nhan-nhat); }

.trang-nd { position: relative; }
.hero { padding: 48px 0 20px; gap: 56px; }
.hero h1 { font-size: clamp(36px, 5.2vw, 60px); line-height: 1.08; }
.hero h1 em { font-style: normal; background: linear-gradient(90deg, var(--abc-cam), var(--abc-hong-sen)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero__cam-ket li::before { content: ""; display: inline-block; width: 20px; height: 20px; margin-right: 8px; vertical-align: -4px; border-radius: 50%;
  background: var(--abc-xanh) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M6 12.5l4 4 8-9' fill='none' stroke='%23fff' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center / 14px no-repeat; }
.hero__hinh { position: relative; min-width: 0; }
.buoc li { position: relative; padding: 26px 22px 24px; }
.gt-the { position: relative; }
.o-y { position: relative; }
.o-y__bieu { width: 44px; height: 44px; border-radius: 14px; display: grid; place-items: center; margin-bottom: 12px; color: #fff;
  background: linear-gradient(135deg, var(--abc-cam), var(--abc-hong-sen)); }
.o-y__bieu svg { width: 24px; height: 24px; }
.hoi-dap summary::after { content: ""; width: 10px; height: 10px; border-right: 2.5px solid var(--nhan); border-bottom: 2.5px solid var(--nhan);
  transform: translateY(-70%) rotate(45deg); font: inherit; transition: transform .2s; }
.hoi-dap details[open] summary::after { content: ""; transform: translateY(-30%) rotate(-135deg); }
.chan__thuong-hieu img { width: 150px; height: auto; }
.dau-trang h1, .tim-dau h1 { font-size: clamp(32px, 4.4vw, 48px); }

@media (max-width: 1080px) { .dau__menu a { padding: 8px 10px; font-size: 15px; } }
@media (max-width: 900px) {
  .dau__trong { height: auto; flex-wrap: wrap; padding: 10px 16px 8px; gap: 8px 12px; }
  .dau__menu { order: 3; margin: 0; width: 100%; flex: none; overflow-x: auto; scrollbar-width: none; }
  .dau__ben { margin-left: auto; }
}
@media (max-width: 560px) {
  .nut-ra span { display: none; }
  .nut-ra { padding: 0 9px; }
  .tai-khoan__chu { display: none; }
  .tai-khoan { padding: 2px; }
}
/* màn hẹp (rà 28/10): hộp bên của hồ sơ không được rộng hơn cột; nút gói học cho chữ xuống dòng */
.ben-dinh { grid-template-columns: minmax(0, 1fr); min-width: 0; }
.chon-goi .nut { white-space: normal; text-align: center; min-width: 0; padding: 8px 10px; }
.chon-goi small { white-space: normal; line-height: 1.3; }

/* điện thoại (rà 28/10): thẻ giáo viên – ảnh nhỏ cạnh tên, nội dung dùng hết bề ngang; bộ lọc 2 cột; dòng thanh toán không bẻ nhãn */
@media (max-width: 560px) {
  .the-gs { position: relative; grid-template-columns: minmax(0, 1fr); gap: 12px; padding: 18px; }
  .the-gs > a:first-child { position: absolute; left: 18px; top: 18px; }
  .the-gs__anh, .the-gs .anh-chu { width: 60px; height: 60px; border-radius: 16px; font-size: 28px; }
  .the-gs__ten { min-height: 60px; padding-left: 74px; align-content: center; row-gap: 4px; }
  .the-gs__ten h3 { flex-basis: 100%; font-size: 20px; line-height: 1.15; }
  .the-gs__so { gap: 14px; }
  .bo-loc { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 10px; padding: 12px; }
  .bo-loc label, .bo-loc select { min-width: 0; width: 100%; }
  .bo-loc label { flex: none; }
  .bo-loc label:first-child { grid-column: 1 / -1; }
  .dong { flex-wrap: wrap; }
  .dong > span { flex: none; white-space: nowrap; }
  .dong > b { flex: 1 1 60%; min-width: 0; }
}

/* vận hành / Góc giáo viên trên màn hẹp (rà 28/10): bảng cuộn ngang trong khung, không đẩy cả trang */
.khu { grid-template-columns: 220px minmax(0, 1fr); }
.khu__noi, .khu > * { min-width: 0; }
.cuon-ngang { overflow-x: auto; -webkit-overflow-scrolling: touch; max-width: 100%; }
@media (max-width: 760px) {
  .khu { grid-template-columns: minmax(0, 1fr); }
  .cuon-ngang .bang { min-width: 620px; }
}
@media (max-width: 760px) {
  .khu__noi > form.the { grid-template-columns: minmax(0, 1fr) !important; }   /* form thêm giáo viên: một cột */
}
.bang select.o { min-width: 150px; }

/* ---------- sổ học viên (CRM giáo viên) ---------- */
.chip--tim { background: var(--sm-oai); color: var(--sm-khoi); }
.dau-muc { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 6px; }
.dau-muc h1 { margin: 0; }
.lui-lai { display: inline-block; margin-bottom: 8px; font-weight: 700; color: var(--lien-ket); text-decoration: none; }
.hang-nut { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin: 10px 0; }
.ds-hv { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr)); gap: 12px; margin-top: 14px; }
.the-hv { display: grid; gap: 8px; padding: 16px; background: var(--mat); border: 2px solid var(--vien-3d); border-bottom-width: 5px; border-radius: var(--r);
  color: inherit; text-decoration: none; transition: transform .15s; }
.the-hv:hover { transform: translateY(-2px); border-color: var(--vien-3d-day); }
.the-hv__dau { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.the-hv__dau b { font: 700 20px var(--chu-de); color: var(--tieu-de); margin-right: auto; }
.the-hv__dong { display: grid; grid-template-columns: 92px minmax(0, 1fr); gap: 8px; font-size: 14px; }
.the-hv__dong span { color: var(--chu-3); font-weight: 700; }
.the-hv__chan { display: flex; justify-content: space-between; gap: 8px; flex-wrap: wrap; font-size: 13px; color: var(--chu-3); font-weight: 700; }
.luoi-so--chu .o-so b { font: 700 16px/1.4 var(--chu-than); margin-top: 4px; }
.so-dau-bai { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.so-dau-bai > li { display: grid; grid-template-columns: 64px minmax(0, 1fr); gap: 14px; padding: 14px; background: var(--mat); border-radius: var(--r); border: .5px solid var(--vien); }
.so-dau-bai > li p { margin: 6px 0 0; }
.so-dau-bai__ngay { text-align: center; background: var(--sm-oai); color: var(--sm-dem); border-radius: 14px; padding: 8px 4px; align-self: start; }
.so-dau-bai__ngay b { display: block; font: 700 20px var(--chu-de); }
.so-dau-bai__ngay span { font-size: 12px; font-weight: 700; }
.so-dau-bai__bai { font-weight: 700; margin-bottom: 4px; }
.buoi__truoc { margin-top: 8px; padding: 8px 12px; background: var(--sm-oai); border-radius: var(--r-sm); font-size: 14px; color: var(--chu-2); }
.buoi__truoc a { font-weight: 700; color: var(--lien-ket); }
.o-y.nho { padding: 10px 14px; font-size: 14px; margin: 8px 0; }
.chon-bai { display: grid; gap: 8px; }
.chon-bai__hai { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr); gap: 8px; }
.o-nhip { display: flex; align-items: center; gap: 8px; margin: 8px 0; font-weight: 700; font-size: 14px; color: var(--chu-2); }
.o--so { width: 92px; min-width: 0; }
.lich-cd { display: grid; gap: 8px; justify-items: start; }
.lich-cd__dong { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.lich-cd__dong .o { width: auto; min-width: 0; }
@media (max-width: 560px) { .chon-bai__hai { grid-template-columns: 1fr; } }

/* lịch tuần */
.lt-cuon { border-radius: var(--r); background: var(--mat); border: .5px solid var(--vien); }
.lt { display: grid; grid-template-columns: 46px repeat(7, minmax(96px, 1fr)); min-width: 760px; }
.lt-truc span { position: absolute; right: 6px; transform: translateY(-50%); font-size: 11px; color: var(--chu-3); font-weight: 700; }
.lt-truc span:first-child { transform: none; }
.lt-cot { border-left: .5px solid var(--vien); }
.lt-cot.is-hom-nay .lt-cot__dau { background: var(--sm-oai); }
.lt-cot__dau { height: 46px; display: grid; place-content: center; text-align: center; border-bottom: .5px solid var(--vien); font-size: 13px; }
.lt-cot__dau span { color: var(--chu-3); font-weight: 700; font-size: 12px; }
.lt-cot__than { position: relative; background: repeating-linear-gradient(to bottom, transparent 0 43px, var(--vien) 43px 44px); }
.lt-mo { position: absolute; left: 0; right: 0; background: rgba(27, 110, 83, .10); }
.lt-su { position: absolute; left: 3px; right: 3px; padding: 2px 6px; border-radius: 8px; font-size: 11px; line-height: 1.25; overflow: hidden;
  text-decoration: none; text-align: left; border: 0; cursor: pointer; display: block; font-family: inherit; }
.lt-su b, .lt-su span { display: block; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.lt-su--online { background: var(--sm-khoi); color: #fff; }
.lt-su--online.is-qua { background: var(--abc-hong); }
.lt-su--co-so { background: var(--sm-vang); color: #3a2a00; }
.lt-su--ban { background: repeating-linear-gradient(135deg, rgba(224, 35, 78, .08) 0 6px, rgba(224, 35, 78, .16) 6px 12px); color: var(--loi); }
.chu-giai { display: flex; flex-wrap: wrap; gap: 14px; margin: 0 0 10px; font-size: 13px; font-weight: 700; color: var(--chu-2); }
.cg::before { content: ""; display: inline-block; width: 12px; height: 12px; border-radius: 4px; margin-right: 6px; vertical-align: -1px; }
.cg--mo::before { background: rgba(27, 110, 83, .3); }
.cg--online::before { background: var(--sm-khoi); }
.cg--co-so::before { background: var(--sm-vang); }
.cg--ban::before { background: rgba(224, 35, 78, .16); }

/* báo cáo học tập (phụ huynh) */
.bc-dau { background: var(--chuyen-say); border-radius: var(--r); padding: 24px; margin-bottom: 18px; }
.bc-dau h1 { margin: 4px 0 6px; }
.bc-hien { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr)); gap: 12px; margin: 16px 0; }
.bc-hien > div { background: var(--mat); border-radius: var(--r-sm); padding: 14px 16px; border: 2px solid var(--vien-3d); }
.bc-hien span { display: block; font-size: 13px; font-weight: 700; color: var(--chu-3); }
.bc-hien b { display: block; margin-top: 4px; }
p.chip { white-space: normal; max-width: 100%; }

/* ---------- tin nhắn học viên ↔ giáo viên (assets/js/tin-nhan.js) ---------- */
.tn { display: grid; grid-template-columns: 300px minmax(0, 1fr); height: min(640px, calc(100vh - 220px)); min-height: 420px;
  background: var(--mat); border: 2px solid var(--vien-3d, var(--vien)); border-radius: var(--r); overflow: hidden; }
.tn__ds { border-right: .5px solid var(--vien); overflow-y: auto; }
.tn__cuoc { display: grid; grid-template-columns: 44px minmax(0, 1fr) auto; gap: 10px; align-items: center; padding: 10px 12px;
  color: inherit; text-decoration: none !important; border-bottom: .5px solid var(--vien); }
.tn__cuoc:hover { background: var(--nhan-nhat); }
.tn__cuoc.dang-o { background: var(--nhan-nhat); }
.tn__cuoc img, .tn__cuoc .anh-chu, .tn__anh img, .tn__anh .anh-chu { width: 44px; height: 44px; border-radius: 50%; object-fit: cover; font-size: 20px; }
.tn__giua { display: grid; min-width: 0; }
.tn__giua b, .tn__cuoi { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.tn__cuoi { font-size: 14px; color: var(--chu-3); }
.tn__cuoc.chua-doc .tn__cuoi { color: var(--chu); font-weight: 700; }
.tn__phai { display: grid; justify-items: end; gap: 4px; font-size: 12px; color: var(--chu-3); font-weight: 700; }
.dem { display: inline-block; min-width: 20px; text-align: center; font: 700 12px/18px var(--chu-than); background: var(--nhan); color: var(--mat);
  border-radius: 999px; padding: 0 6px; }
.dau__menu .dem { background: var(--cta); color: #fff; margin-left: 6px; vertical-align: 1px; }
.khu__ben .dem { margin-left: 6px; }
.tn__khung { display: grid; grid-template-rows: auto minmax(0, 1fr) auto; min-height: 0; }
.tn__khung > .tn__chon { grid-row: 1 / -1; align-self: center; text-align: center; padding: 24px; }
.tn__dau { display: flex; align-items: center; gap: 10px; padding: 10px 14px; border-bottom: .5px solid var(--vien); }
.tn__dau b { font: 700 19px var(--chu-de); color: var(--tieu-de); }
.tn__anh img, .tn__anh .anh-chu { width: 36px; height: 36px; font-size: 16px; display: grid; }
.tn__lui { display: none; font: 700 28px/1 var(--chu-than); padding: 0 6px; text-decoration: none !important; color: var(--nhan); }
.tn__luong { overflow-y: auto; padding: 14px; display: flex; flex-direction: column; gap: 6px; }
.tn__trong { margin: auto; text-align: center; }
.tn__tin { display: grid; justify-items: start; max-width: 78%; }
.tn__tin.cua-toi { justify-items: end; align-self: flex-end; }
.tn__bong { padding: 8px 14px; border-radius: 18px 18px 18px 4px; background: var(--mat-2); border: 1px solid var(--vien);
  white-space: pre-wrap; overflow-wrap: anywhere; }
.tn__tin.cua-toi .tn__bong { background: var(--nhan); color: var(--mat); border-color: transparent; border-radius: 18px 18px 4px 18px; }
.tn__tin small { font-size: 11px; color: var(--chu-3); font-weight: 700; padding: 2px 6px; }
.tn__go { display: flex; gap: 8px; align-items: flex-end; padding: 10px 12px; border-top: .5px solid var(--vien); }
.tn__o { min-height: 44px !important; max-height: 140px; resize: none; }
.tn__gui { flex: none; width: 44px; height: 44px; border-radius: 50%; border: 0; background: var(--nhan); color: var(--mat);
  display: grid; place-items: center; cursor: pointer; }
.tn__gui[disabled] { opacity: .5; cursor: default; }
@media (max-width: 760px) {
  .tn { grid-template-columns: minmax(0, 1fr); height: calc(100vh - 200px); }
  .tn--mo .tn__ds, .tn:not(.tn--mo) .tn__khung { display: none; }
  .tn__ds { border-right: 0; }
  .tn__lui { display: inline-block; }
}
/* chia mục trên "Buổi học của tôi": Buổi học | Tin nhắn */
.chia-muc { display: inline-flex; gap: 4px; padding: 4px; background: var(--mat-2); border: .5px solid var(--vien); border-radius: 14px; margin: 8px 0 4px; }
.chia-muc a { padding: 8px 16px; border-radius: 11px; font-weight: 700; color: var(--chu-2); text-decoration: none !important; }
.chia-muc a.dang-o { background: var(--mat); color: var(--tieu-de); box-shadow: var(--bong); }
.chia-muc .dem { margin-left: 6px; }


/* =====================================================================
 * LỚP KÍNH ABC (như ứng dụng): nền trường chuyển sắc đứng yên, thẻ kính mờ có vành sáng, nút viên thuốc.
 * Đặt cuối tệp: quyết định màu + hình cho mọi thành phần dùng chung.
 * ===================================================================== */
html { background: var(--nen); }
body { background: var(--nen-truong); background-attachment: fixed; color: var(--chu); min-height: 100vh; }
h1, h2, h3 { font-weight: 700; letter-spacing: 0; }
:focus-visible { outline: 3px solid var(--nhan); outline-offset: 2px; border-radius: 10px; }
a { color: var(--lien-ket); }

/* nút: viên thuốc; phụ = kính trắng trong, chính = dải cam → hồng sen */
.nut { min-height: 46px; padding: 0 22px; border-radius: 999px; border: 1px solid var(--vien-dam); background: var(--mat);
  -webkit-backdrop-filter: blur(14px) saturate(160%); backdrop-filter: blur(14px) saturate(160%);
  color: var(--chu); font: 700 16px var(--chu-than); letter-spacing: 0; box-shadow: none; text-shadow: none;
  transition: background .15s, box-shadow .15s, transform .08s; }
.nut:hover { background: rgba(255, 255, 255, .95); text-decoration: none; }
.nut:active { transform: scale(.98); }
.nut--chinh, .nut--chinh:hover { background: var(--cta); color: #fff; border: 1px solid rgba(255, 255, 255, .35); box-shadow: var(--cta-bong);
  text-shadow: 0 1px 1.5px rgba(138, 30, 72, .35); }
.nut--chinh:hover { filter: brightness(1.04); }
.nut--chinh[disabled] { background: #ECE6E7; color: var(--chu-2); box-shadow: none; text-shadow: none; filter: none; opacity: 1; }
.nut--phu { background: var(--mat); border-color: var(--nhan-vien); color: var(--nhan); }
.nut--phu:hover { background: #fff; }
.nut--sang { background: #fff; border-color: #fff; color: var(--chu); }
.nut--nhe { border-color: transparent; background: transparent; -webkit-backdrop-filter: none; backdrop-filter: none; }
.nut--nhe:hover { background: var(--nhan-nhat); }
.nut--nho { min-height: 38px; padding: 0 16px; font-size: 15px; border-radius: 999px; }
.nut--lon { min-height: 54px; padding: 0 30px; font-size: 18px; border-radius: 999px; }
.nut--nguy { color: var(--loi); }
.nut[disabled] { opacity: .55; }

/* ô nhập */
.o, input.o, select.o, textarea.o, .bo-loc select { border: 1px solid var(--vien-dam); border-radius: 14px; background: rgba(255, 255, 255, .9); font-weight: 600; color: var(--chu); }
.o:focus, .bo-loc select:focus { border-color: var(--nhan); outline: none; box-shadow: 0 0 0 3px var(--nhan-nhat); }
.o:focus-visible { outline: none; }

/* thẻ kính */
.the, .buoc li, .o-y, .gt-the, .gs-nho, .goi, .the-gs, .buoi, .bac-ds li, .hoi-dap details, .bo-loc, .the-hv, .mo-phong, .khoi--nen,
.loi-ich li, .khoi--cuoi, .bao-dam, .tn, .lt-cuon, .o-so, .bang, .cam-ket__muc, .muc-luc a, .bc-hien > div, .so-dau-bai > li {
  background: var(--anh-kinh), var(--mat); -webkit-backdrop-filter: blur(18px) saturate(160%); backdrop-filter: blur(18px) saturate(160%);
  border: 1px solid var(--vien); border-radius: var(--r); box-shadow: var(--bong), inset 0 1px 0 var(--vanh); }
.hoi-dap details, .bac-ds li, .loi-ich li, .cam-ket__muc, .o-so { border-radius: var(--r-sm); }
.muc-luc a { border-radius: 999px; box-shadow: none; }
.bang { border-radius: var(--r-sm); }
.khoi--nen { border-radius: 32px; }
.khoi--nen .o-y, .loi-ich li { background: rgba(255, 255, 255, .7); box-shadow: inset 0 1px 0 var(--vanh); }
.gs-nho { transition: transform .15s, box-shadow .15s; }
.gs-nho:hover, .the-gs:hover { transform: translateY(-2px); box-shadow: var(--bong-noi), inset 0 1px 0 var(--vanh); }
.the-gs { transition: transform .15s, box-shadow .15s; }
dialog.hop { background: var(--mat-dac); border: 1px solid var(--vien); border-radius: 28px; box-shadow: var(--bong-noi); }
dialog.hop::backdrop { background: rgba(58, 24, 48, .32); }
.toast { background: rgba(19, 19, 19, .88); -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px); border-radius: 999px; }

/* chip: viên mảnh */
.chip { background: var(--nhan-nhat); color: var(--nhan); border: 1px solid transparent; font-weight: 700; }
.chip--tot { background: var(--tot-nen); color: var(--tot); }
.chip--canh-bao { background: var(--canh-bao-nen); color: var(--canh-bao); }
.chip--loi { background: var(--loi-nen); color: var(--loi); }
.chip--vang { background: var(--vang-nen); color: var(--vang); }
.chip--xam { background: rgba(19, 19, 19, .06); color: var(--chu-2); }

/* thanh trên: dải kính bo tròn */
.dau { position: sticky; top: 0; z-index: 30; padding: 12px 16px 0; background: transparent; border: 0; -webkit-backdrop-filter: none; backdrop-filter: none; }
.dau__trong { max-width: 1200px; min-height: 64px; padding: 6px 10px 6px 20px; border-radius: 999px; background: rgba(255, 255, 255, .72);
  -webkit-backdrop-filter: blur(20px) saturate(170%); backdrop-filter: blur(20px) saturate(170%);
  border: 1px solid var(--vien); box-shadow: var(--bong), inset 0 1px 0 var(--vanh); }
.dau__logo img { height: 40px; width: auto; display: block; }
.dau__menu a { color: var(--chu); font-weight: 700; font-size: 15px; padding: 9px 14px; border-radius: 999px; }
.dau__menu a:hover { background: var(--nhan-nhat); color: var(--chu); text-decoration: none; }
.dau__menu a.dang-o { background: var(--nhan-nhat); color: var(--nhan); }
.tai-khoan { background: rgba(255, 255, 255, .6); border: 1px solid var(--vien); }
@media (max-width: 900px) {
  .dau { padding: 8px 10px 0; }
  .dau__trong { border-radius: 26px; padding: 8px 10px 6px 14px; }
}
@media (max-width: 560px) { .dau__logo img { height: 34px; } }

/* trang nội dung */
.nhan-tren { color: var(--nhan); letter-spacing: .05em; }
.khoi > h2, .dau-khoi h2, .khoi .hai-cot h2, .khoi--nen h2 { color: var(--tieu-de); }
.lien-ket-mui { color: var(--nhan); }
.buoc__so { width: 44px; height: 44px; border-radius: 50%; color: #fff; font: 700 20px var(--chu-de); background: linear-gradient(135deg, var(--abc-cam), var(--abc-hong-sen)); }
.buoc h3 { font-size: 21px; color: var(--tieu-de); }
.loi-ich b { color: var(--nhan); }
.gt-the h3 { display: inline-block; font-size: 18px; color: var(--nhan); background: var(--nhan-nhat); padding: 6px 16px; border-radius: 999px; margin-bottom: 16px; }
.gt-the li { border-left: 3px solid var(--abc-hong); border-radius: 2px; padding-left: 14px; }
.gs-nho__anh { border-radius: 18px; }
.bao-dam { padding: 32px clamp(20px, 4vw, 44px); border-radius: 32px; }
.bao-dam h2 { color: var(--tieu-de); }
.bao-dam p { color: var(--chu-2); }
.khoi--cuoi { padding: 44px 20px 40px; border-radius: 32px; }
.mo-phong { border-radius: 26px; overflow: hidden; }
.mo-phong__thanh { background: linear-gradient(90deg, var(--abc-cam), var(--abc-hong-sen)); }
.mo-phong__ai--gs { background: rgba(243, 112, 83, .14); color: var(--canh-bao); }
.mo-phong__ai--hv { background: var(--nhan-nhat); color: var(--nhan); }
.mo-phong__phim i.den { background: var(--abc-den); }
.o-y--nhat { background: var(--nhan-nhat); border: 1px solid var(--nhan-vien); box-shadow: none; }
.o-y--nhat h3 { color: var(--tieu-de); }
.o-y--nhat p { color: var(--chu-2); }
.anh-chu { background: linear-gradient(135deg, var(--abc-cam), var(--abc-hong-sen)); }
.so-lieu b, .the-gs__so b { color: var(--abc-xanh); }
.o-gio.chon { background: var(--nhan); border-color: var(--nhan); }
.khu__ben button.dang-o { background: var(--nhan-nhat); color: var(--nhan); }
.lt-su--online { background: var(--abc-hong-sen); }
.cg--online::before { background: var(--abc-hong-sen); }
.dem, .dau__menu .dem, .khu__ben .dem { background: var(--abc-hong-sen); color: #fff; }
.tn__tin.cua-toi .tn__bong, .tn__gui { background: var(--abc-hong-sen); color: #fff; }

/* chân trang: kem trong, chữ tối */
.chan { margin-top: 48px; padding: 44px 16px 28px; background: rgba(247, 246, 241, .82); -webkit-backdrop-filter: blur(16px); backdrop-filter: blur(16px);
  border-top: 1px solid var(--vien); color: var(--chu-2); }
.chan h3 { color: var(--tieu-de); font-size: 16px; }
.chan a { color: var(--chu-2); }
.chan a:hover { color: var(--nhan); }
.chan__cuoi { color: var(--chu-2); border-top: 1px solid var(--vien); }

/* ---------- tải ứng dụng ---------- */
.ung-dung-luoi { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 22px; }
.the-ud { display: grid; grid-template-columns: 64px minmax(0, 1fr); gap: 6px 16px; align-items: start; padding: 22px; }
.the-ud > img { width: 64px; height: 64px; border-radius: 16px; box-shadow: 0 6px 16px -8px rgba(58, 24, 48, .45); grid-row: span 2; }
.the-ud h3 { font-size: 20px; }
.the-ud p { margin: 2px 0 0; color: var(--chu-2); font-size: 15px; }
.the-ud__nut { grid-column: 1 / -1; display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.the-ud__ghi { grid-column: 1 / -1; font-size: 13px; color: var(--chu-3); margin: 4px 0 0; }
@media (max-width: 760px) { .ung-dung-luoi { grid-template-columns: minmax(0, 1fr); } }

/* ---------- khối "Con học tại trung tâm" (trang chủ) ---------- */
.trung-tam { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: 32px; align-items: center; }
.trung-tam .danh-dau { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.danh-dau li { display: grid; grid-template-columns: 28px minmax(0, 1fr); gap: 10px; align-items: start; color: var(--chu-2); }
.danh-dau li::before { content: ""; width: 24px; height: 24px; border-radius: 50%; margin-top: 1px;
  background: var(--nhan-nhat) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M6 12.5l4 4 8-9' fill='none' stroke='%23C7366F' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center / 14px no-repeat; }
.danh-dau b { color: var(--chu); }
@media (max-width: 900px) { .trung-tam { grid-template-columns: minmax(0, 1fr); gap: 20px; } }

/* =====================================================================
 * KHU HỌC TẬP (cua-con.html): phụ huynh / học viên của trung tâm – đăng nhập SĐT / email, lịch học, vào lớp, nhật ký,
 * bài về nhà, xin nghỉ, đánh giá buổi học (assets/js/cua-con.js)
 * ===================================================================== */
.hoc { max-width: 1120px; }
.hoc-dn { max-width: 460px; margin: 20px auto 0; padding: 28px; }
.hoc-dn h1 { font-size: 30px; }
.hoc-dn .nhan-o { margin-top: 18px; }
.chia { display: grid; grid-auto-flow: column; grid-auto-columns: 1fr; gap: 4px; padding: 4px; border-radius: 999px; background: rgba(19, 19, 19, .05);
  border: 1px solid var(--vien); margin: 16px 0 4px; }
.chia button { min-height: 38px; border: 0; border-radius: 999px; background: transparent; font-weight: 700; color: var(--chu-2); cursor: pointer; padding: 0 12px; }
.chia button[aria-pressed="true"], .chia button[aria-selected="true"] { background: #fff; color: var(--nhan); box-shadow: 0 2px 8px -2px rgba(58, 24, 48, .25); }
.hoc-dn__khac { margin: 18px 0 0; padding-top: 16px; border-top: 1px solid var(--vien); font-size: 14px; color: var(--chu-2); }

.hoc-dau { display: flex; align-items: flex-end; justify-content: space-between; gap: 12px 20px; flex-wrap: wrap; margin: 8px 0 14px; }
.hoc-dau h1 { font-size: clamp(28px, 4vw, 38px); }
.hoc-dau .phu { margin: 4px 0 0; }
.chon-con { display: flex; gap: 8px; flex-wrap: wrap; }
.chon-con button { min-height: 38px; padding: 0 16px; border-radius: 999px; border: 1px solid var(--vien-dam); background: var(--mat); font-weight: 700; cursor: pointer; color: var(--chu); }
.chon-con button[aria-pressed="true"] { background: var(--nhan-nhat); border-color: var(--nhan-vien); color: var(--nhan); }
.hoc-the-muc { position: sticky; top: 92px; z-index: 5; max-width: 520px; margin: 0 0 18px;
  background: rgba(255, 255, 255, .7); -webkit-backdrop-filter: blur(16px); backdrop-filter: blur(16px); }
@media (max-width: 900px) { .hoc-the-muc { top: 118px; } }

.so-buoi { display: grid; gap: 0; padding: 6px 20px; margin-bottom: 18px; }
.so-buoi__dong { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 12px 0; }
.so-buoi__dong + .so-buoi__dong { border-top: 1px solid var(--vien); }
.so-buoi__dong b { display: block; }
.so-buoi__so { display: flex; align-items: baseline; gap: 6px; white-space: nowrap; color: var(--chu-2); font-size: 14px; }
.so-buoi__so strong { font: 700 28px var(--chu-de); color: var(--abc-xanh); }

.hoc-luoi { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 24px; align-items: start; }
@media (max-width: 760px) { .hoc-luoi { grid-template-columns: minmax(0, 1fr); } }   /* iPad dọc (820) vẫn hai cột */
.hoc-muc { font-size: 20px; margin: 22px 0 10px; }
.hoc-luoi > div > .hoc-muc:first-child { margin-top: 0; }
.ds-the { display: grid; gap: 12px; }
.trong-mo { color: var(--chu-3); margin: 4px 0; }

.the-buoi { padding: 18px 20px; display: grid; gap: 10px; }
.the-buoi__dau { display: flex; align-items: flex-start; gap: 10px; }
.the-buoi__dau > div { min-width: 0; flex: 1; }
.the-buoi__dau b { display: block; }
.the-buoi__dau .phu { font-size: 14px; }
.the-buoi__chip { display: flex; gap: 6px; flex-wrap: wrap; justify-content: flex-end; }
.the-buoi__nut { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.the-buoi--dang { border-color: var(--nhan-vien); }
.the-buoi .ghi { font-size: 14px; color: var(--chu-2); margin: 0; }
.nd-bai { list-style: none; padding: 0; margin: 0; display: grid; gap: 4px; }
.nd-bai li { padding-left: 16px; position: relative; }
.nd-bai li::before { content: ""; position: absolute; left: 2px; top: .65em; width: 6px; height: 6px; border-radius: 50%; background: var(--abc-hong); }
.nd-bai .phu { font-size: 14px; }
.nhan-xet { margin: 0; white-space: pre-line; }
.nho-tieu-de { font-weight: 700; font-size: 14px; color: var(--chu-2); margin: 4px 0 0; }

.bvn { display: grid; gap: 8px; }
.bvn-dong { display: grid; grid-template-columns: 36px minmax(0, 1fr) auto; gap: 10px; align-items: center; padding: 10px 12px; border-radius: 16px;
  background: rgba(255, 255, 255, .7); border: 1px solid var(--vien); color: var(--chu); text-decoration: none !important; }
a.bvn-dong:hover { border-color: var(--nhan-vien); background: #fff; }
.bvn-dong__bieu { width: 36px; height: 36px; border-radius: 50%; display: grid; place-items: center; background: var(--nhan-nhat); color: var(--nhan); }
.bvn-dong__bieu svg { width: 18px; height: 18px; }
.bvn-dong b { display: block; font-size: 15px; }
.bvn-dong span { display: block; font-size: 13px; color: var(--chu-2); overflow-wrap: anywhere; }
.bvn-dong__tap { font-weight: 700; color: var(--nhan); font-size: 14px; white-space: nowrap; }
.the-bvn { padding: 18px 20px; display: grid; gap: 10px; }
.the-bvn__dau { display: flex; gap: 12px; align-items: center; }
.the-bvn__dau .bvn-dong__bieu { width: 42px; height: 42px; }
.the-bvn__dau h3 { font-size: 18px; }

.luyen { display: grid; gap: 10px; }
.luyen__muc { display: grid; gap: 6px; padding: 12px; border-radius: 16px; background: var(--canh-bao-nen); }
.luyen__muc b { color: var(--canh-bao); font-size: 13px; }
.luyen__muc p { margin: 0; font-size: 15px; }
.luyen__anh { display: flex; gap: 8px; flex-wrap: wrap; }
.luyen__anh img { width: min(220px, 100%); border-radius: 10px; border: 1px solid var(--vien); background: #fff; }

/* "Báo cáo buổi học" (thẻ buổi đã học): các mục cách nhau bằng đường kẻ mảnh, nhãn mục nhỏ in đậm màu phụ */
.bao-cao { gap: 0; }
.bao-cao > .the-buoi__dau { padding-bottom: 12px; flex-wrap: wrap; }
@media (max-width: 560px) { .bao-cao > .the-buoi__dau .the-buoi__chip { flex-basis: 100%; justify-content: flex-start; } }
.bao-cao__muc { display: grid; gap: 8px; padding: 12px 0; border-top: 1px solid var(--vien); }
.bao-cao__nhan { margin: 0; font: 700 13px/1.3 var(--chu-than); letter-spacing: .04em; text-transform: uppercase; color: var(--chu-3); }
.bao-cao__bai { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.bao-cao__bai li { display: grid; gap: 4px; }
.bao-cao__bai b { font-size: 16px; line-height: 1.35; }
.bao-cao__meta { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 10px; font-size: 14px; }
.bao-cao__bai .mo { margin: 0; font-size: 14px; }
.bao-cao__nx { margin: 0; line-height: 1.6; }
.bao-cao__nx--gon { display: -webkit-box; -webkit-line-clamp: 4; -webkit-box-orient: vertical; overflow: hidden; }
.nut-chu { justify-self: start; border: 0; background: none; padding: 2px 0; font-weight: 700; font-size: 14px; color: var(--nhan); cursor: pointer; }
.nut-chu:hover { text-decoration: underline; }
.bao-cao__luyen { display: grid; gap: 8px; }
.luyen-dong { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; gap: 10px; align-items: start; padding: 10px 12px; border-radius: 16px;
  background: var(--mat-2); border: 1px solid var(--vien); }
.luyen-dong__moc { font: 700 13px/1 var(--chu-than); font-variant-numeric: tabular-nums; color: var(--canh-bao); background: var(--canh-bao-nen);
  padding: 5px 8px; border-radius: 999px; margin-top: 1px; }
.luyen-dong p { margin: 0; font-size: 15px; }
.luyen-dong p.phu { font-size: 14px; margin-top: 2px; }
.luyen-dong__anh { padding: 0; border: 1px solid var(--vien); border-radius: 10px; overflow: hidden; background: #fff; cursor: zoom-in; width: 92px; aspect-ratio: 16 / 10; }
.luyen-dong__anh img { width: 100%; height: 100%; object-fit: cover; display: block; }
.bao-cao__them { margin: 0; padding: 0 0 0 18px; display: grid; gap: 4px; font-size: 15px; }
.bao-cao__them li::marker { color: var(--abc-hong); }
.bao-cao .danh-gia { margin-top: 2px; padding-top: 12px; }
.bvn-dong__dan { color: var(--chu) !important; margin-top: 2px; }
.bvn-dong__tap { padding: 6px 14px; border-radius: 999px; background: var(--nhan-nhat); border: 1px solid var(--nhan-vien); }
.anh-to { display: block; width: min(960px, 86vw); max-height: 76vh; object-fit: contain; border-radius: 12px; background: #fff; }
.ds-the--cot { max-width: 700px; margin: 0 auto; }
@media (max-width: 420px) { .luyen-dong { grid-template-columns: auto minmax(0, 1fr); } .luyen-dong__anh { grid-column: 2; width: 120px; } }

.danh-gia { border-top: 1px solid var(--vien); padding-top: 10px; display: grid; gap: 6px; }
.danh-gia__tt { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; font-size: 14px; }
.sao { color: var(--sao); letter-spacing: 1px; }
.sao i { font-style: normal; color: rgba(19, 19, 19, .2); }
.chon-sao { display: flex; gap: 6px; margin: 6px 0 2px; }
.chon-sao button { width: 52px; height: 52px; border-radius: 50%; border: 1px solid var(--vien-dam); background: #fff; cursor: pointer; display: grid; place-items: center; color: rgba(19, 19, 19, .25); }
.chon-sao button svg { width: 30px; height: 30px; }
.chon-sao button[aria-checked="true"] { color: var(--sao); border-color: rgba(245, 165, 36, .5); background: rgba(255, 201, 40, .12); }
.chon-van-de { display: flex; flex-wrap: wrap; gap: 8px; }
.chon-van-de button { min-height: 36px; padding: 0 14px; border-radius: 999px; border: 1px solid var(--vien-dam); background: #fff; font-weight: 700; font-size: 14px; color: var(--chu-2); cursor: pointer; }
.chon-van-de button[aria-pressed="true"] { background: var(--nhan-nhat); border-color: var(--nhan-vien); color: var(--nhan); }

.hang-tk { display: grid; gap: 0; padding: 4px 0; }
.hang-tk > * { padding: 14px 20px; }
.hang-tk > * + * { border-top: 1px solid var(--vien); }
.cong-tac { display: flex; gap: 14px; align-items: flex-start; justify-content: space-between; }
.cong-tac input { appearance: none; -webkit-appearance: none; flex: none; width: 50px; height: 30px; border-radius: 999px; background: rgba(19, 19, 19, .16);
  position: relative; cursor: pointer; transition: background .2s; margin: 0; }
.cong-tac input::after { content: ""; position: absolute; top: 3px; left: 3px; width: 24px; height: 24px; border-radius: 50%; background: #fff;
  box-shadow: 0 2px 4px rgba(0, 0, 0, .2); transition: transform .2s; }
.cong-tac input:checked { background: var(--abc-xanh); }
.cong-tac input:checked::after { transform: translateX(20px); }
.cong-tac input:focus-visible { outline: 3px solid var(--nhan); outline-offset: 2px; }
.nut--lon { white-space: normal; text-align: center; max-width: 100%; line-height: 1.25; }

/* ---------- thanh trên ở điện thoại: chỉ logo + Đăng nhập (Vào học, Tìm giáo viên, Cách học đã có trong trang) ---------- */
@media (max-width: 700px) {
  .dau__menu a.cong { display: none; }
  .dau__trong:not(:has(.dau__menu a:not(.cong))) .dau__menu { display: none; }
  .dau__trong:not(:has(.dau__menu a:not(.cong))) { flex-wrap: nowrap; border-radius: 999px; padding: 6px 8px 6px 14px; min-height: 56px; }
  body:not(:has(.dau__menu a:not(.cong))) .hoc-the-muc { top: 72px; }   /* thẻ mục trang Vào học dính ngay dưới thanh trên một hàng */
}
/* hộp chọn cửa đăng nhập */
.chon-dn { display: grid; gap: 10px; margin-top: 16px; }
.chon-dn__muc { display: grid; gap: 2px; text-align: left; width: 100%; padding: 16px 44px 16px 18px; position: relative; cursor: pointer;
  background: rgba(255, 255, 255, .8); border: 1px solid var(--vien-dam); border-radius: var(--r-sm); color: var(--chu); font: inherit; }
.chon-dn__muc:hover { border-color: var(--nhan-vien); background: #fff; text-decoration: none; }
.chon-dn__muc::after { content: "›"; position: absolute; right: 18px; top: 50%; transform: translateY(-50%); font: 700 24px var(--chu-de); color: var(--nhan); }
.chon-dn__muc b { color: var(--tieu-de); font-size: 17px; }
.chon-dn__muc span { color: var(--chu-2); font-size: 14px; }

/* trang Vào học: "Xin nghỉ" dạng chữ nhẹ; thẻ học bổ trợ cuối Lịch học */
.lk-nhe { border: 0; background: none; padding: 4px 2px; font: 700 14px var(--chu-than); color: var(--nhan); cursor: pointer; white-space: nowrap; }
.lk-nhe:hover { text-decoration: underline; }
.the-buoi__dau > .the-buoi__chip { flex: 0 1 auto; }   /* cột chip/"Xin nghỉ" chỉ rộng vừa đủ, ngày giờ không bị ngắt dòng */
.the-buoi__chip .lk-nhe { align-self: center; }
.the-bo-tro { margin-top: 18px; background: var(--nhan-nhat); border-color: var(--nhan-vien); box-shadow: none; }
/* ô nốt nhạc trong dòng bài về nhà: ".bvn-dong span" (chữ) không được đè lên – giữ tròn, nốt nằm giữa, màu hồng */
.bvn-dong > .bvn-dong__bieu { display: grid; place-items: center; color: var(--nhan); font-size: 0; }

/* =====================================================================
 * Giao diện trang nhã kiểu yola.vn: thanh trên trắng tràn ngang (thay dải kính bo tròn), nút ☰ trên điện thoại, thanh nút cuối
 * màn hình điện thoại, 2 nút liên hệ nổi (Zalo, Messenger), thẻ "Tham gia lớp" khi tới giờ học (assets/js/chung.js)
 * ===================================================================== */
.dau { padding: 0; background: rgba(255, 255, 255, .96); border-bottom: 1px solid var(--vien); box-shadow: 0 6px 20px -16px rgba(58, 24, 48, .45);
  -webkit-backdrop-filter: blur(14px) saturate(160%); backdrop-filter: blur(14px) saturate(160%); }
.dau__trong { max-width: 1120px; min-height: 68px; padding: 8px 16px; border-radius: 0; background: transparent; border: 0; box-shadow: none;
  -webkit-backdrop-filter: none; backdrop-filter: none; }
.nut-menu { display: none; }
.hoc-the-muc { top: 80px; }
@media (max-width: 900px) {
  .dau { padding: 0; }
  .dau__trong { border-radius: 0; padding: 6px 16px 4px; }
  .hoc-the-muc { top: 108px; }
}
@media (max-width: 700px) {
  .dau__trong, .dau__trong:not(:has(.dau__menu a:not(.cong))) { flex-wrap: wrap; border-radius: 0; padding: 6px 8px 6px 14px; min-height: 60px; }
  .dau:not(.dau--mo) .dau__menu { display: none !important; }
  .dau--mo .dau__menu { display: flex !important; flex-direction: column; align-items: stretch; width: 100%; order: 3; margin: 0; padding: 6px 0 10px;
    border-top: 1px solid var(--vien); overflow: visible; }
  .dau--mo .dau__menu a, .dau--mo .dau__menu a.cong { display: block; font-size: 17px; padding: 12px 6px; border-radius: 12px; }
  .nut-menu { display: inline-grid; place-items: center; width: 42px; height: 42px; border: 0; border-radius: 12px; background: transparent;
    color: var(--nhan); cursor: pointer; }
  .nut-menu:hover, .dau--mo .nut-menu { background: var(--nhan-nhat); }
  .dau__ben { gap: 6px; }
  .hoc-the-muc, body:not(:has(.dau__menu a:not(.cong))) .hoc-the-muc { top: 68px; }
}

/* thanh nút cuối màn hình (điện thoại) */
.thanh-duoi { display: none; }
@media (max-width: 700px) {
  body.co-thanh-duoi { padding-bottom: 76px; }
  .thanh-duoi { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; position: fixed; left: 10px; right: 10px; z-index: 40;
    bottom: calc(10px + env(safe-area-inset-bottom)); padding: 6px; border-radius: 999px; background: rgba(255, 255, 255, .96);
    border: 1px solid var(--vien); box-shadow: 0 14px 34px -14px rgba(58, 24, 48, .5); -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px); }
  .thanh-duoi a { display: grid; place-items: center; min-height: 46px; border-radius: 999px; font-weight: 700; font-size: 16px; color: var(--nhan); }
  .thanh-duoi a:hover { text-decoration: none; }
  .thanh-duoi .thanh-duoi__chinh { background: var(--cta); color: #fff; }
}

/* 2 nút liên hệ nổi góc phải */
.lien-he-noi { position: fixed; right: 16px; bottom: 24px; z-index: 39; display: grid; gap: 10px; }
.lien-he-noi__nut { display: block; width: 50px; height: 50px; border-radius: 50%; box-shadow: 0 10px 22px -10px rgba(0, 0, 0, .55); transition: transform .15s; }
.lien-he-noi__nut:hover { transform: scale(1.06); }
.lien-he-noi__nut svg { display: block; width: 100%; height: 100%; }
@media (max-width: 700px) {
  .lien-he-noi { right: 12px; gap: 8px; }
  .co-thanh-duoi .lien-he-noi { bottom: calc(80px + env(safe-area-inset-bottom)); }
  .lien-he-noi__nut { width: 44px; height: 44px; }
  body.co-the-lop .lien-he-noi { display: none; }       /* đang có thẻ Tham gia lớp: nhường chỗ */
}

/* thẻ "Tham gia lớp" nổi cuối màn hình khi tới giờ học (giáo viên đã mở phòng online) */
.tham-gia { position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%); z-index: 45; width: min(560px, calc(100% - 24px)); display: grid; gap: 8px; }
.tham-gia[hidden] { display: none; }
.tham-gia__the { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; align-items: center; gap: 12px; padding: 12px 12px 12px 18px;
  border-radius: 22px; background: #fff; border: 1px solid var(--nhan-vien); box-shadow: 0 20px 44px -16px rgba(58, 24, 48, .55); }
.tham-gia__cham { width: 12px; height: 12px; border-radius: 50%; background: var(--tot); animation: tham-gia-nhay 1.6s infinite; }
@keyframes tham-gia-nhay { 0% { box-shadow: 0 0 0 0 rgba(27, 110, 83, .5); } 70%, 100% { box-shadow: 0 0 0 10px rgba(27, 110, 83, 0); } }
.tham-gia__chu b { display: block; color: var(--tieu-de); }
.tham-gia__chu span { font-size: 14px; color: var(--chu-2); }
@media (max-width: 700px) {
  .tham-gia { bottom: calc(12px + env(safe-area-inset-bottom)); }
  body.co-the-lop .thanh-duoi { display: none; }        /* thẻ Tham gia lớp là việc chính lúc này: một nút hồng thôi */
  .tham-gia__the { grid-template-columns: auto minmax(0, 1fr); }
  .tham-gia__the .nut { grid-column: 1 / -1; }
}
@media (prefers-reduced-motion: reduce) { .tham-gia__cham { animation: none; } }

/* =====================================================================
 * TONE NHẸ, TRANG NHÃ (30/10, theo saypiano.com): nền trắng, nhiều khoảng trắng, viền mảnh, bóng rất nhẹ, không kính mờ,
 * không nền chuyển sắc; hồng sen ABC chỉ làm điểm nhấn (nút chính đặc một màu, chữ nhấn), không phủ mảng lớn.
 * Khối này đè các khối "kính" phía trên – giữ ở CUỐI tệp.
 * ===================================================================== */
:root {
  --nen: #FFFFFF; --nen-truong: #FFFFFF; --nen-nhat: #FBF8F6;          /* nền mục xen kẽ: kem rất nhạt */
  --mat: #FFFFFF; --mat-2: #FFFFFF; --anh-kinh: none;
  --vien: #EEE6E8; --vien-dam: #DCCFD3; --vanh: transparent;
  --bong: 0 1px 2px rgba(40, 20, 30, .04), 0 8px 24px -18px rgba(40, 20, 30, .22);
  --bong-noi: 0 2px 4px rgba(40, 20, 30, .05), 0 16px 36px -20px rgba(40, 20, 30, .30);
  --chu: #22191C; --chu-2: #5F5559; --chu-3: #857A7E; --tieu-de: #1D1518;
  --nhan: #C2386F; --nhan-nhat: #FDEFF4; --nhan-vien: #F4C6D6;
  --cta: #E94C8A; --cta-bong: 0 6px 16px -8px rgba(233, 76, 138, .55); --cta-hover: #DC3F7D;
}
body { background: #FFFFFF; background-attachment: scroll; }
.the, .buoc li, .o-y, .gt-the, .gs-nho, .goi, .the-gs, .buoi, .bac-ds li, .hoi-dap details, .bo-loc, .the-hv, .mo-phong, .khoi--nen,
.loi-ich li, .khoi--cuoi, .bao-dam, .tn, .lt-cuon, .o-so, .bang, .cam-ket__muc, .muc-luc a, .bc-hien > div, .so-dau-bai > li, .li, .tim-nhanh {
  background: #FFFFFF; -webkit-backdrop-filter: none; backdrop-filter: none; border: 1px solid var(--vien); box-shadow: var(--bong); }
.khoi--nen { background: var(--nen-nhat); border-color: transparent; box-shadow: none; }
.khoi--nen .o-y, .loi-ich li, .gt-so__ds li { background: #FFFFFF; box-shadow: none; }
.nut--chinh, .nut--chinh:hover { background: var(--cta); border: 1px solid var(--cta); box-shadow: var(--cta-bong); text-shadow: none; }
.nut--chinh:hover { background: var(--cta-hover); border-color: var(--cta-hover); filter: none; }
.nut:not(.nut--chinh) { background: #FFFFFF; } .nut { -webkit-backdrop-filter: none; backdrop-filter: none; }
.nut--phu { background: #FFFFFF; border-color: var(--nhan-vien); color: var(--nhan); }
.o, input.o, select.o, textarea.o, .bo-loc select { background: #FFFFFF; }
/* biểu tượng, số bước, chữ cái giáo viên: nền hồng phấn nhạt, nét hồng – không còn khối chuyển sắc cam → hồng */
.li__bieu, .o-y__bieu, .buoc__so { background: var(--nhan-nhat); color: var(--nhan); box-shadow: none; }
.anh-chu { background: var(--nhan-nhat); color: var(--nhan); }
.chan { background: var(--nen-nhat); -webkit-backdrop-filter: none; backdrop-filter: none; }
.dau { background: rgba(255, 255, 255, .97); box-shadow: none; border-bottom: 1px solid var(--vien); }
.mo-phong__thanh { background: var(--nhan); }
.the-bo-tro { background: var(--nhan-nhat); border-color: var(--nhan-vien); }
.thanh-duoi .thanh-duoi__chinh { background: var(--cta); }
.chia { background: #F5F0F1; }
/* phòng chờ lớp học (chung.js moPhongCho): ảnh giáo viên, đồng hồ đếm ngược, ba chấm chờ */
.phong-cho { display: grid; justify-items: center; text-align: center; gap: 6px; min-width: min(360px, 80vw); }
.phong-cho__anh { width: 84px; height: 84px; border-radius: 24px; object-fit: cover; font-size: 36px; margin-bottom: 6px; }
.phong-cho .nhan-tren { margin: 4px 0 0; }
.phong-cho h2 { font-size: 22px; }
.phong-cho .phu { margin: 0; }
.phong-cho__o { display: grid; gap: 2px; margin: 14px 0 6px; padding: 14px 28px; border-radius: 20px; background: var(--nen-nhat); }
.phong-cho__o span { font-size: 13px; font-weight: 700; color: var(--chu-3); }
.phong-cho__dem { font: 700 34px/1.1 var(--chu-de); color: var(--tieu-de); font-variant-numeric: tabular-nums; }
.phong-cho__cho { display: inline-flex; gap: 6px; margin: 6px 0 2px; }
.phong-cho__cho i { width: 8px; height: 8px; border-radius: 50%; background: var(--nhan); animation: phong-cho-nhay 1.2s infinite ease-in-out; }
.phong-cho__cho i:nth-child(2) { animation-delay: .15s; } .phong-cho__cho i:nth-child(3) { animation-delay: .3s; }
@keyframes phong-cho-nhay { 0%, 80%, 100% { opacity: .25; transform: scale(.8); } 40% { opacity: 1; transform: none; } }
.phong-cho .hop__nut { justify-content: center; }
.tham-gia__anh { width: 44px; height: 44px; border-radius: 14px; object-fit: cover; font-size: 20px; }
@media (prefers-reduced-motion: reduce) { .phong-cho__cho i { animation: none; opacity: .6; } }
/* phiếu "Đăng ký học thử" dùng chung (chung.js phieuTuVan): hồ sơ giáo viên, hộp thoại ở Tìm giáo viên */
.phieu-tv { display: grid; gap: 12px; }
.phieu-tv h3 { font-size: 22px; margin: 0; }
.phieu-tv .phu { margin: -6px 0 4px; }
.phieu-tv .thong-bao-loi { margin: 0; }
.phieu-tv .thong-bao-loi:empty { display: none; }
.phieu-tv .o-noi, .de-lai .o-noi { position: relative; display: block; }
.phieu-tv .o-noi .o { height: 56px; padding: 20px 16px 6px; border-radius: 16px; border: 1px solid #EBD9DF; background: #FBF7F8; font-weight: 600; width: 100%; }
.phieu-tv .o-noi span { position: absolute; left: 17px; top: 50%; transform: translateY(-50%); color: var(--chu-3); font-weight: 600; pointer-events: none;
  transition: top .15s, font-size .15s, transform .15s; }
.phieu-tv .o-noi .o:focus + span, .phieu-tv .o-noi .o:not(:placeholder-shown) + span { top: 9px; transform: none; font-size: 12px; color: var(--nhan); }
.phieu-tv__xong { display: grid; justify-items: center; text-align: center; gap: 8px; padding: 12px 0; }
.phieu-tv__xong h3, .phieu-tv__xong p { margin: 0; }
.phieu-tv__tick { width: 52px; height: 52px; border-radius: 50%; background: var(--tot) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M6 12.5l4 4 8-9' fill='none' stroke='%23fff' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center / 28px no-repeat; }
.dang-ky { padding: 24px; }
dialog.hop .phieu-tv { min-width: min(380px, 78vw); }
/* Vào học › Tin nhắn (cua-con.js veTinNhan): dòng đầu + nút Zalo trung tâm; khung chat dùng lại .tn */
.tn-dau { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 14px; }
.tn-dau .phu { margin: 0; }
.nut-zalo { width: auto !important; background: #0068FF !important; border-color: #0068FF !important; color: #fff !important; box-shadow: 0 10px 22px -10px rgba(0, 104, 255, .7); }
.nut-zalo:hover { filter: brightness(1.06); }
.tn__cuoc { width: 100%; background: transparent; border: 0; border-bottom: .5px solid var(--vien); text-align: left; cursor: pointer; font: inherit; }
.hoc .tn { height: min(600px, calc(100vh - 260px)); }
/* Tài khoản › Lịch sử đăng ký (cua-con.js theDangKy) */
.dk__ds { display: grid; gap: 10px; margin-top: 12px; }
.dk__muc { padding: 14px 16px; border-radius: 16px; background: var(--nen-nhat, #FBF8F6); border: 1px solid var(--vien); display: grid; gap: 10px; }
.dk__dau { display: flex; align-items: flex-start; justify-content: space-between; gap: 10px; }
.dk__dau b { display: block; color: var(--tieu-de); }
.dk__dau .phu { font-size: 13px; }
.dk__luoi { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 8px 14px; }
.dk__dong { display: grid; gap: 2px; }
.dk__dong span { font-size: 12px; font-weight: 700; color: var(--chu-3); }
.dk__dong b { font-size: 15px; color: var(--chu); font-variant-numeric: tabular-nums; }
.dk__no b { color: var(--loi); }
@media (max-width: 560px) { .dk__luoi { grid-template-columns: 1fr 1fr; } .tn-dau .nut-zalo { width: 100% !important; } }
/* chân trang gọn: thương hiệu + 2 cột */
.chan__trong { grid-template-columns: 1.4fr 1fr 1fr !important; }
@media (max-width: 700px) { .chan__trong { grid-template-columns: 1fr 1fr !important; } .chan__thuong-hieu { grid-column: 1 / -1; } }
/* khu học trên điện thoại: 4 thẻ mục trên một hàng */
@media (max-width: 560px) { .hoc-the-muc button { padding: 0 4px; font-size: 14px; white-space: nowrap; } }
/* chọn con (phụ huynh có nhiều con): hàng thẻ, con đang xem nổi viền màu riêng; điện thoại vuốt ngang */
.chon-con { display: flex; gap: 12px; margin: 8px 0 18px; overflow-x: auto; scrollbar-width: none; padding: 4px 2px 8px; }
.chon-con::-webkit-scrollbar { display: none; }
.chon-con__the { flex: 0 0 auto; min-width: 230px; display: grid; grid-template-columns: 48px minmax(0, 1fr) auto; align-items: center; gap: 12px;
  padding: 12px 16px 12px 12px; border-radius: 20px; border: 1.5px solid var(--vien); background: #FFFFFF; cursor: pointer; text-align: left;
  font: inherit; color: var(--chu); box-shadow: var(--bong); transition: transform .2s, box-shadow .2s, border-color .2s; }
.chon-con__the:hover { transform: translateY(-2px); }
.chon-con__the[aria-pressed="true"] { border-color: var(--mau); box-shadow: 0 0 0 3px color-mix(in srgb, var(--mau) 18%, transparent), var(--bong); }
.chon-con__chu { width: 48px; height: 48px; border-radius: 16px; display: grid; place-items: center; font: 700 22px var(--chu-de); color: #fff;
  background: var(--mau); }
.chon-con__the[aria-pressed="false"] .chon-con__chu { opacity: .55; }
.chon-con__ten { display: grid; min-width: 0; }
.chon-con__ten b { font: 700 18px var(--chu-de); color: var(--tieu-de); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.chon-con__ten small { font-size: 13px; color: var(--chu-3); }
.chon-con__so { display: grid; justify-items: center; font-size: 12px; color: var(--chu-3); font-weight: 700; }
.chon-con__so b { font: 700 20px/1 var(--chu-de); color: var(--abc-xanh); }
@media (max-width: 560px) { .chon-con { margin: 4px -16px 14px; padding: 4px 16px 8px; } .chon-con__the { min-width: 200px; } }
.chon-con { flex-wrap: nowrap !important; }
/* lọc theo môn (một con học nhiều môn) + nhãn môn trên mỗi buổi */
.loc-mon { display: flex; gap: 8px; margin: 0 0 16px; overflow-x: auto; scrollbar-width: none; }
.loc-mon::-webkit-scrollbar { display: none; }
.loc-mon button { flex: none; min-height: 36px; padding: 0 16px; border-radius: 999px; border: 1px solid var(--vien-dam); background: #fff; font: 700 14px var(--chu-than); color: var(--chu-2); cursor: pointer; }
.loc-mon button[aria-pressed="true"] { background: var(--tieu-de); border-color: var(--tieu-de); color: #fff; }
.chip-mon { background: color-mix(in srgb, var(--mau) 14%, #fff) !important; color: var(--mau) !important; }

/* ===== thẻ mục khu học (cua-con.js): ghim chắc chắn, không lơ lửng =====
 * máy tính / iPad: dải trắng tràn ngang, dính sát ngay dưới thanh trên (--cao-dau đo bằng JS), gạch chân hồng ở thẻ đang mở;
 * điện thoại: thanh 4 thẻ có biểu tượng cố định ở đáy màn hình như ứng dụng. */
.hoc-the-muc, body:not(:has(.dau__menu a:not(.cong))) .hoc-the-muc {
  position: sticky; top: var(--cao-dau, 68px); z-index: 25; display: flex; gap: 4px; max-width: none; width: 100vw; margin: 0 0 22px calc(50% - 50vw);
  padding: 0 max(16px, calc(50vw - 544px)); background: #FFFFFF; border: 0; border-bottom: 1px solid var(--vien); border-radius: 0; box-shadow: 0 8px 16px -14px rgba(38, 16, 28, .35); }
.hoc-the-muc button { position: relative; display: inline-flex; align-items: center; gap: 8px; min-height: 54px; padding: 0 18px; border: 0; border-radius: 0;
  background: none !important; box-shadow: none !important; font: 700 16px var(--chu-than); color: var(--chu-2); cursor: pointer; white-space: nowrap; }
.hoc-the-muc button::after { content: ""; position: absolute; left: 12px; right: 12px; bottom: 0; height: 3px; border-radius: 3px 3px 0 0; background: transparent; }
.hoc-the-muc button[aria-selected="true"] { color: var(--nhan); }
.hoc-the-muc button[aria-selected="true"]::after { background: var(--nhan); }
.hoc-the-muc button:hover { color: var(--tieu-de); }
.hoc-the-muc__bieu svg { width: 20px; height: 20px; display: block; }
main.hoc { overflow: visible; }
@media (max-width: 700px) {
  .hoc-the-muc, body:not(:has(.dau__menu a:not(.cong))) .hoc-the-muc {
    position: fixed; top: auto; left: 0; right: 0; bottom: 0; width: auto; margin: 0; padding: 4px 4px calc(4px + env(safe-area-inset-bottom));
    display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; border-top: 1px solid var(--vien); border-bottom: 0;
    box-shadow: 0 -8px 20px -14px rgba(38, 16, 28, .4); -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px); background: rgba(255, 255, 255, .97); }
  .hoc-the-muc button { flex-direction: column; justify-content: center; gap: 3px; min-height: 58px; padding: 0 2px; font-size: 12px; }
  .hoc-the-muc button::after { top: 0; bottom: auto; left: 30%; right: 30%; border-radius: 0 0 3px 3px; }
  .hoc-the-muc__bieu svg { width: 24px; height: 24px; }
  body:has(.hoc-the-muc) { padding-bottom: calc(72px + env(safe-area-inset-bottom)); }
  body:has(.hoc-the-muc) .chan { display: none; }
}