/* Thiên Ân Education – giao diện hệ thống trắc nghiệm.
   Bố cục: dải đầu navy viền vàng như bìa tài liệu Thiên Ân; thân trang cột 1120px;
   bảng và thẻ nền trắng; vàng chỉ dùng làm điểm nhấn (logo, nút nộp bài, điểm số). */
:root {
  --ql-bai: #235DA8; --ql-bai-nen: #EDF4FF;
  --ql-dapan: #7550A5; --ql-dapan-nen: #F5EFFB;
  --bg: #F3F5FA;
  --surface: #FFFFFF;
  --surface-2: #F8F9FC;
  --ink: #16203A;
  --muted: #5A6580;
  --line: #DCE1EC;
  --band: #1B2A4E;
  --band-2: #24365F;
  --band-ink: #F4F1E8;
  --gold: #A87A06;
  --gold-bright: #E2B23C;
  --gold-soft: #FFF5DA;
  --accent: #1B2A4E;
  --on-accent: #FFFFFF;
  --accent-soft: #E7ECF7;
  --ok: #1D7A45;
  --ok-soft: #E2F3E9;
  --bad: #B3261E;
  --bad-soft: #FBE7E5;
  --warn: #8A5A00;
  --warn-soft: #FFF1D6;
  /* Một font duy nhất cho toàn trang: Be Vietnam Pro, thiết kế cho tiếng Việt, dấu rõ, dễ đọc trên điện thoại */
  --f-display: "Be Vietnam Pro", "Segoe UI", Arial, sans-serif;
  --f-body: "Be Vietnam Pro", "Segoe UI", Arial, sans-serif;
  --f-mono: "Be Vietnam Pro", "Segoe UI", Arial, sans-serif;
  --r: 10px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --ql-bai: #98C0FF; --ql-bai-nen: #182A45;
    --ql-dapan: #CFACF6; --ql-dapan-nen: #2C2040;
    --bg: #0D1322; --surface: #161F35; --surface-2: #1A2440; --ink: #E6EBF5; --muted: #9AA5BE; --line: #2A3552;
    --band: #0A1020; --band-2: #121B33; --band-ink: #EFEBDF; --gold: #E2B23C; --gold-bright: #E9BE52; --gold-soft: #2E2714;
    --accent: #9DB6F2; --on-accent: #0D1322; --accent-soft: #1F2A47;
    --ok: #5CC98A; --ok-soft: #12301F; --bad: #F08A80; --bad-soft: #3A1916; --warn: #F0C060; --warn-soft: #33270F;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body { background: var(--bg); color: var(--ink); font-family: var(--f-body); font-size: 17px; line-height: 1.6; min-height: 100vh; display: flex; flex-direction: column; }
[hidden] { display: none !important; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: var(--accent); }
:focus-visible { outline: 3px solid var(--gold-bright); outline-offset: 2px; }
h1, h2, h3 { font-family: var(--f-display); font-weight: 700; text-wrap: balance; margin: 0; line-height: 1.3; letter-spacing: -0.01em; }
h1 { font-size: clamp(24px, 3.4vw, 30px); }
h2 { font-size: 21px; }
h3 { font-size: 18px; }
.mono { letter-spacing: .02em; font-weight: 600; }
.wrap { width: 100%; max-width: 1120px; margin: 0 auto; padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px)); }
.muted { color: var(--muted); }
.small { font-size: 14px; }
.mono { font-family: var(--f-mono); }
.num { font-variant-numeric: tabular-nums; }
.eyebrow { font-size: 12px; font-weight: 600; letter-spacing: .12em; text-transform: uppercase; color: var(--gold); }

/* ---------- Dải đầu ---------- */
.band { background: var(--band); color: var(--band-ink); border-bottom: 3px solid var(--gold-bright); }
.band-in { display: flex; align-items: center; gap: 12px 20px; padding-block: 12px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 12px; color: inherit; text-decoration: none; }
.logo { width: 44px; height: 44px; border-radius: 50%; border: 2.5px solid var(--gold-bright); display: grid; place-items: center; font-family: var(--f-display); font-weight: 700; font-size: 17px; color: var(--gold-bright); flex: none; }
.brand-t { display: flex; flex-direction: column; line-height: 1.3; }
.brand-t b { font-size: 13px; letter-spacing: .14em; }
.brand-t i { font-family: var(--f-display); color: var(--gold-bright); font-size: 14px; }
.nav { display: flex; gap: 4px; flex-wrap: wrap; flex: 1; }
.nav a { color: var(--band-ink); text-decoration: none; padding: 7px 12px; border-radius: 6px; font-size: 15px; opacity: .85; }
.nav a:hover { background: var(--band-2); opacity: 1; }
.nav a.on { background: var(--band-2); opacity: 1; box-shadow: inset 0 -2px 0 var(--gold-bright); }
.who { display: flex; align-items: center; gap: 10px; font-size: 14px; flex-wrap: wrap; }
.who .ten { font-weight: 600; }
.who .vt { font-size: 12px; padding: 2px 8px; border: 1px solid var(--gold-bright); color: var(--gold-bright); border-radius: 999px; }
.who a, .who button { color: var(--band-ink); background: none; border: 0; padding: 4px 6px; cursor: pointer; font-size: 14px; text-decoration: underline; text-underline-offset: 3px; opacity: .85; }
.who form { margin: 0; }

main.main { padding-block: 28px 56px; flex: 1; }
footer.foot { padding-block: 18px 28px; font-size: 13px; color: var(--muted); border-top: 1px solid var(--line); }

/* ---------- Thành phần chung ---------- */
.page-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 12px 20px; flex-wrap: wrap; margin-bottom: 22px; }
.page-head .t { display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.page-head p { margin: 4px 0 0; color: var(--muted); max-width: 65ch; }
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.stack { display: flex; flex-direction: column; gap: 16px; }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; border-radius: 8px; padding: 9px 18px; font-weight: 600; cursor: pointer; border: 1.5px solid var(--accent); background: var(--accent); color: var(--on-accent); min-height: 42px; text-decoration: none; font-size: 15px; white-space: nowrap; }
.btn:hover { filter: brightness(1.1); }
.btn.ghost { background: transparent; color: var(--accent); }
.btn.gold { background: var(--gold-bright); border-color: var(--gold-bright); color: #1B2A4E; }
.btn.danger { background: transparent; border-color: var(--bad); color: var(--bad); }
.btn.sm { min-height: 34px; padding: 5px 12px; font-size: 14px; }
.btn[disabled] { opacity: .45; cursor: not-allowed; filter: none; }
.linkbtn { background: none; border: 0; padding: 0; color: var(--accent); cursor: pointer; text-decoration: underline; text-underline-offset: 3px; font-size: 14px; }
.linkbtn.danger { color: var(--bad); }

.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r); padding: 20px; min-width: 0; }
.panel { max-width: 640px; }

.pill { display: inline-block; font-size: 12px; font-weight: 600; padding: 2px 10px; border-radius: 999px; white-space: nowrap; }
.pill.ok { background: var(--ok-soft); color: var(--ok); }
.pill.bad { background: var(--bad-soft); color: var(--bad); }
.pill.warn { background: var(--warn-soft); color: var(--warn); }
.pill.info { background: var(--accent-soft); color: var(--accent); }
.pill.mute { background: var(--surface-2); color: var(--muted); border: 1px solid var(--line); }

.flash { padding: 12px 16px; border-radius: 8px; margin-bottom: 18px; font-weight: 500; }
.flash.ok { background: var(--ok-soft); color: var(--ok); }
.flash.bad { background: var(--bad-soft); color: var(--bad); }

/* Biểu mẫu */
.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 14px; min-width: 0; }
.field label { font-weight: 600; font-size: 14px; }
.field .hint { font-size: 13px; color: var(--muted); }
.input, .field input:not([type=checkbox]):not([type=radio]), .field select, .field textarea { border: 1.5px solid var(--line); border-radius: 8px; padding: 9px 12px; background: var(--surface); min-height: 42px; width: 100%; }
.field textarea { min-height: 180px; font-family: var(--f-mono); font-size: 14px; }
.input:focus, .field input:focus, .field select:focus, .field textarea:focus { border-color: var(--accent); outline: none; }
.check { display: flex; gap: 8px; align-items: center; font-size: 15px; cursor: pointer; }
.check input { width: 18px; height: 18px; accent-color: var(--accent); }
.err { color: var(--bad); font-size: 14px; }
.field-validation-error { color: var(--bad); font-size: 13px; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 0 16px; }
.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0 16px; }
@media (max-width: 640px) { .grid2, .grid3 { grid-template-columns: 1fr; } }

/* Thanh lọc */
.filters { display: flex; gap: 10px; flex-wrap: wrap; align-items: flex-end; margin-bottom: 16px; }
.filters .field { margin: 0; }
.filters .input, .filters select { min-height: 40px; }

/* Bảng */
.tbl-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--r); background: var(--surface); }
table.tbl { border-collapse: collapse; width: 100%; font-size: 14px; }
.tbl th, .tbl td { padding: 10px 12px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: middle; font-variant-numeric: tabular-nums; }
.tbl th { font-size: 12px; text-transform: uppercase; letter-spacing: .07em; color: var(--muted); background: var(--surface-2); white-space: nowrap; }
.tbl tr:last-child td { border-bottom: 0; }
.tbl tbody tr:hover { background: var(--surface-2); }
.tbl td.r, .tbl th.r { text-align: right; }
.tbl td.c, .tbl th.c { text-align: center; }
.tbl .nowrap { white-space: nowrap; }
.tbl .acts { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.tbl .acts form { margin: 0; }
.empty { padding: 36px 20px; text-align: center; color: var(--muted); }

/* Ô số liệu */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; margin-bottom: 20px; }
.stat { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r); padding: 14px 16px; }
.stat b { display: block; font-family: var(--f-display); font-size: 26px; font-variant-numeric: tabular-nums; line-height: 1.2; }
.stat span { font-size: 13px; color: var(--muted); }

/* ---------- Đăng nhập ---------- */
.login { display: grid; grid-template-columns: 1.05fr 1fr; max-width: 920px; margin: 12px auto 0; border-radius: 14px; overflow: hidden; border: 1px solid var(--line); background: var(--surface); }
.login .side { background: var(--band); color: var(--band-ink); padding: 40px 36px; display: flex; flex-direction: column; gap: 18px; position: relative; overflow: hidden; }
.login .side::after { content: ""; position: absolute; right: -70px; bottom: -70px; width: 220px; height: 220px; border-radius: 50%; border: 2px solid var(--gold-bright); opacity: .35; }
.login .side .logo { width: 64px; height: 64px; font-size: 24px; }
.login .side h1 { font-size: 30px; color: var(--band-ink); }
.login .side .slogan { font-family: var(--f-display); font-style: italic; color: var(--gold-bright); font-size: 18px; }
.login .side ul { margin: 0; padding-left: 18px; opacity: .9; font-size: 15px; display: flex; flex-direction: column; gap: 6px; }
.login .form { padding: 40px 36px; }
.login .form h2 { margin-bottom: 4px; }
.login .form p.muted { margin: 0 0 22px; font-size: 15px; }
.pick { display: flex; flex-direction: column; gap: 8px; margin-bottom: 16px; }
.pick label { display: flex; gap: 10px; align-items: center; border: 1.5px solid var(--line); border-radius: 8px; padding: 10px 12px; cursor: pointer; }
.pick label:has(input:checked) { border-color: var(--accent); background: var(--accent-soft); }
@media (max-width: 760px) { .login { grid-template-columns: 1fr; } .login .side { padding: 26px 22px; } .login .side ul { display: none; } .login .form { padding: 26px 22px; } }

/* ---------- Học sinh: danh sách bài ---------- */
.list { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 330px), 1fr)); gap: 14px; }
.exam { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r); padding: 18px; display: flex; flex-direction: column; gap: 8px; min-width: 0; }
.exam .meta { display: flex; gap: 4px 14px; flex-wrap: wrap; font-size: 14px; color: var(--muted); font-variant-numeric: tabular-nums; }
.exam .best { display: flex; align-items: baseline; gap: 8px; font-size: 14px; color: var(--muted); }
.exam .best b { font-family: var(--f-display); font-size: 22px; color: var(--ink); }
.exam .foot { margin-top: auto; padding-top: 10px; display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.exam .foot form { margin: 0; }

/* ---------- Làm bài ---------- */
.qbar { position: sticky; top: env(safe-area-inset-top, 0px); z-index: 5; background: var(--bg); border-bottom: 1px solid var(--line); }
.qbar .wrap { display: flex; align-items: center; gap: 14px; padding-block: 10px; }
.qbar .t { flex: 1; min-width: 0; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.qbar .sub { font-size: 13px; color: var(--muted); font-weight: 400; }
.save { font-size: 13px; color: var(--muted); white-space: nowrap; }
.save.loi { color: var(--bad); font-weight: 600; }
.clock { font-family: var(--f-mono); font-weight: 700; font-size: 18px; padding: 4px 12px; border-radius: 8px; background: var(--accent-soft); font-variant-numeric: tabular-nums; }
.clock.warn { background: var(--bad-soft); color: var(--bad); }
.prog { height: 4px; background: var(--line); }
.prog i { display: block; height: 100%; width: 0; background: var(--gold-bright); transition: width .25s; }
.quiz { display: grid; grid-template-columns: minmax(0, 1fr); gap: 20px; }
@media (min-width: 920px) { .quiz { grid-template-columns: minmax(0, 1fr) 270px; align-items: start; } .sheet { position: sticky; top: calc(env(safe-area-inset-top, 0px) + 78px); } }
.qs { display: flex; flex-direction: column; gap: 14px; min-width: 0; }
.q { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r); padding: 18px; scroll-margin-top: 90px; }
.q .text { font-weight: 600; margin: 0 0 12px; }
.qn { font-family: var(--f-display); font-weight: 700; color: var(--gold); margin-right: 6px; }
.opts { display: flex; flex-direction: column; gap: 8px; }
.opt { display: flex; align-items: flex-start; gap: 12px; text-align: left; width: 100%; padding: 10px 12px; border: 1.5px solid var(--line); border-radius: 8px; background: transparent; cursor: pointer; min-height: 44px; }
button.opt:hover { border-color: var(--accent); }
.bub { flex: none; width: 28px; height: 28px; border-radius: 50%; border: 2px solid var(--muted); display: grid; place-items: center; font-weight: 700; font-size: 14px; color: var(--muted); }
.opt .ot { padding-top: 2px; }
.opt[aria-pressed="true"] { border-color: var(--accent); background: var(--accent-soft); }
.opt[aria-pressed="true"] .bub { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.sheet { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r); padding: 16px; display: flex; flex-direction: column; gap: 12px; }
.sheet h3 { font-family: var(--f-body); font-size: 13px; letter-spacing: .12em; text-transform: uppercase; color: var(--muted); }
.cells { display: grid; grid-template-columns: repeat(5, 1fr); gap: 6px; }
.cell { border: 1.5px solid var(--line); border-radius: 6px; background: transparent; padding: 4px 0; cursor: pointer; display: flex; flex-direction: column; align-items: center; line-height: 1.2; font-variant-numeric: tabular-nums; }
.cell small { font-size: 11px; color: var(--muted); }
.cell b { font-family: var(--f-mono); font-size: 14px; min-height: 1.2em; }
.cell.on { border-color: var(--accent); background: var(--accent-soft); }

.dlg { position: fixed; inset: 0; background: rgba(8, 12, 24, .55); display: grid; place-items: center; z-index: 20; padding: 16px; }
.dlg .box { background: var(--surface); border-radius: var(--r); padding: 22px; max-width: 440px; width: 100%; display: flex; flex-direction: column; gap: 14px; border: 1px solid var(--line); }
.dlg p { margin: 0; }

/* ---------- Kết quả ---------- */
.rcard { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r); overflow: hidden; max-width: 760px; }
.rcard .top { background: var(--band); color: var(--band-ink); padding: 16px 22px; display: flex; gap: 14px; align-items: center; }
.rcard .top b { display: block; font-size: 12px; letter-spacing: .14em; color: var(--gold-bright); }
.rcard .body { padding: 22px; display: grid; grid-template-columns: auto 1fr; gap: 24px; align-items: center; }
@media (max-width: 600px) { .rcard .body { grid-template-columns: 1fr; } }
.score { text-align: center; padding: 12px 24px; border: 3px solid var(--gold-bright); border-radius: 14px; }
.score b { display: block; font-family: var(--f-display); font-size: 56px; line-height: 1; font-variant-numeric: tabular-nums; }
.score span { font-size: 14px; color: var(--muted); }
dl.kv { display: grid; grid-template-columns: auto 1fr; gap: 6px 16px; margin: 0; font-size: 15px; }
dl.kv dt { color: var(--muted); }
dl.kv dd { margin: 0; font-weight: 600; min-width: 0; overflow-wrap: anywhere; font-variant-numeric: tabular-nums; }
.review { display: flex; flex-direction: column; gap: 12px; max-width: 760px; }
.rv { background: var(--surface); border: 1px solid var(--line); border-left: 5px solid var(--ok); border-radius: var(--r); padding: 14px 16px; }
.rv.sai { border-left-color: var(--bad); }
.rv.bo { border-left-color: var(--muted); }
.rv .head { display: flex; justify-content: space-between; gap: 10px; margin-bottom: 10px; }
.rv .head p { margin: 0; font-weight: 600; }
.rv .opt { cursor: default; }
.rv .opt.dung { border-color: var(--ok); background: var(--ok-soft); }
.rv .opt.dung .bub { background: var(--ok); border-color: var(--ok); color: var(--surface); }
.rv .opt.chonsai { border-color: var(--bad); background: var(--bad-soft); }
.rv .opt.chonsai .bub { background: var(--bad); border-color: var(--bad); color: var(--surface); }
.rv .why { margin-top: 10px; font-size: 14px; color: var(--muted); white-space: pre-line; }
.rv.mot-phan { border-left-color: var(--warn); }

/* Đề nhiều phần: tiêu đề phần */
.phan { font-family: var(--f-body); font-size: 15px; font-weight: 700; color: var(--gold); margin: 10px 0 0; padding: 8px 12px; border-radius: 8px; background: var(--gold-soft); }
.review .phan { margin-top: 14px; }

/* Câu đúng/sai: mỗi ý một dòng, hai nút Đúng / Sai */
.ds { display: flex; flex-direction: column; gap: 8px; }
.ds-y { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 8px 10px 8px 12px; border: 1.5px solid var(--line); border-radius: 8px; }
.ds-nd { flex: 1; min-width: 0; }
.ds-nut { display: flex; gap: 6px; flex: none; }
.ds-b { min-width: 64px; min-height: 40px; padding: 6px 12px; border: 1.5px solid var(--line); border-radius: 8px; background: transparent; color: var(--ink); font: inherit; font-weight: 600; cursor: pointer; }
.ds-b[data-gt="D"][aria-pressed="true"] { border-color: var(--ok); background: var(--ok); color: var(--surface); }
.ds-b[data-gt="S"][aria-pressed="true"] { border-color: var(--bad); background: var(--bad); color: var(--surface); }
.ds-y:has([aria-pressed="true"]) { border-color: var(--accent); }
@media (max-width: 560px) { .ds-y { flex-direction: column; align-items: stretch; } .ds-nut .ds-b { flex: 1; } }

/* Câu trả lời ngắn */
.tln { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.tln label { font-weight: 600; }
.tln-o { flex: 1; min-width: 160px; max-width: 320px; font-size: 17px; }

/* Xem lại câu đúng/sai và trả lời ngắn */
.ds-kq { width: 100%; border-collapse: collapse; font-size: 15px; }
.ds-kq th, .ds-kq td { border: 1px solid var(--line); padding: 6px 10px; text-align: left; }
.ds-kq th { font-size: 13px; color: var(--muted); font-weight: 600; }
.ds-kq .c { text-align: center; width: 84px; }
.ds-kq tr.dung td:nth-child(2) { background: var(--ok-soft); color: var(--ok); font-weight: 700; }
.ds-kq tr.chonsai td:nth-child(2) { background: var(--bad-soft); color: var(--bad); font-weight: 700; }
.tln-kq { display: grid; grid-template-columns: auto 1fr; gap: 6px 14px; margin: 0; }
.tln-kq dt { color: var(--muted); }
.tln-kq dd { margin: 0; }
.tln-kq dd.dung { color: var(--ok); }
.tln-kq dd.chonsai { color: var(--bad); text-decoration: line-through; }

/* Sửa câu đúng/sai */
.sua-ds .bub { text-transform: lowercase; }
.sua-ds-chon { display: flex; gap: 6px; flex: none; }
.sua-ds-chon label { display: inline-flex; align-items: center; gap: 4px; padding: 4px 10px; border: 1.5px solid var(--line); border-radius: 8px; cursor: pointer; font-weight: 600; }
.sua-ds-chon label.on-d { border-color: var(--ok); background: var(--ok-soft); color: var(--ok); }
.sua-ds-chon label.on-s { border-color: var(--bad); background: var(--bad-soft); color: var(--bad); }

/* ---------- Thành phần thêm ở bản 1.1 ---------- */
.who .tdn { font-weight: 400; opacity: .75; }
.sp { flex: 1; }
.tabs { display: flex; gap: 4px; border-bottom: 2px solid var(--line); margin-bottom: 18px; overflow-x: auto; }
.tabs a { padding: 10px 16px; text-decoration: none; color: var(--muted); font-weight: 600; border-bottom: 3px solid transparent; margin-bottom: -2px; white-space: nowrap; display: flex; gap: 8px; align-items: center; }
.tabs a span { font-size: 13px; background: var(--surface-2); border: 1px solid var(--line); border-radius: 999px; padding: 0 8px; font-variant-numeric: tabular-nums; }
.tabs a.on { color: var(--ink); border-bottom-color: var(--gold-bright); }
.tabs a:hover { color: var(--ink); }
.split { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr); gap: 20px; align-items: start; }
@media (max-width: 900px) { .split { grid-template-columns: 1fr; } }
.choices { display: grid; gap: 8px; }
.choice { display: flex; gap: 12px; align-items: flex-start; border: 1.5px solid var(--line); border-radius: 8px; padding: 10px 12px; cursor: pointer; }
.choice:has(input:checked) { border-color: var(--accent); background: var(--accent-soft); }
.choice input { margin-top: 5px; accent-color: var(--accent); width: 17px; height: 17px; }
.choice span { display: flex; flex-direction: column; }
.choice small { color: var(--muted); font-size: 14px; }
.pick-list { max-height: 360px; overflow-y: auto; border: 1px solid var(--line); border-radius: 8px; }
.pick-hs { display: flex; gap: 10px; align-items: center; padding: 8px 12px; border-bottom: 1px solid var(--line); cursor: pointer; }
.pick-hs:last-child { border-bottom: 0; }
.pick-hs:has(input:checked) { background: var(--accent-soft); }
.pick-hs input { width: 17px; height: 17px; accent-color: var(--accent); flex: none; }
a.exam.doc { text-decoration: none; color: inherit; }
a.exam.doc:hover { border-color: var(--accent); }
.logo.sm { width: 34px; height: 34px; font-size: 13px; border-width: 2px; color: var(--gold); border-color: var(--gold); }

/* ---------- Logo (ảnh từ Cài đặt; link hỏng thì hiện chữ TA) ---------- */
.logo-o { width: 46px; height: 46px; flex: none; border-radius: 10px; background: #fff; display: grid; place-items: center; overflow: hidden; box-shadow: 0 0 0 2px var(--gold-bright); }
.logo-o img { width: 100%; height: 100%; object-fit: contain; }
.logo-o > span { display: none; font-weight: 700; color: #1B2A4E; }
.logo-o.hong img { display: none; }
.logo-o.hong > span { display: block; }
.logo-o.sm { width: 34px; height: 34px; border-radius: 8px; box-shadow: 0 0 0 1.5px #A87A06; }
.brand-xem { display: flex; align-items: center; gap: 12px; padding: 12px 14px; margin: -4px 0 16px; border-radius: 10px; background: #1B2A4E; color: #F4F1E8; }
.brand-xem img { width: 52px; height: 52px; object-fit: contain; background: #fff; border-radius: 10px; }
.brand-xem div { display: flex; flex-direction: column; }
.brand-xem i { color: #E9BE52; }

/* ---------- Màn hình đăng nhập ----------
   Nền navy sâu như bìa tài liệu Thiên Ân, ánh vàng nhẹ của logo; khối giới thiệu bên trái, thẻ đăng nhập trắng bên phải. */
body.trang-dang-nhap {
  min-height: 100vh;
  /* Nền sáng với các khối lục giác navy – xanh – điểm vàng ở góc trên phải và dưới trái */
  background: #F2F6FC url("/img/nen-dang-nhap.svg") center / cover no-repeat fixed;
  color: #14264A;
  color-scheme: light;
}
.main-dn { flex: 1; display: grid; place-items: center; padding: 32px max(16px, env(safe-area-inset-right, 0px)) 24px max(16px, env(safe-area-inset-left, 0px)); }
.main-dn > .flash { max-width: 1000px; width: 100%; }
.foot-dn { text-align: center; font-size: 13px; color: #4A5875; padding: 0 16px 22px; }
.dn { width: 100%; max-width: 1000px; display: grid; grid-template-columns: 1.1fr .9fr; gap: 48px; align-items: center; }
.dn-gioi-thieu { display: flex; flex-direction: column; gap: 22px; padding: 28px 30px; border-radius: 16px; background: rgba(255, 255, 255, .78); backdrop-filter: blur(4px); box-shadow: 0 10px 30px rgba(27, 42, 78, .10); }
.dn-thuong-hieu { display: flex; align-items: center; gap: 16px; }
.dn-logo { width: 84px; height: 84px; flex: none; border-radius: 18px; background: #fff; display: grid; place-items: center; overflow: hidden; box-shadow: 0 8px 22px rgba(27, 42, 78, .22), 0 0 0 3px rgba(226,178,60,.9); }
.dn-logo img { width: 100%; height: 100%; object-fit: contain; }
.dn-logo > span { display: none; font-size: 30px; font-weight: 700; color: #1B2A4E; }
.dn-logo.hong img { display: none; }
.dn-logo.hong > span { display: block; }
.dn-ten { display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.dn-ten b { font-size: clamp(20px, 2.3vw, 27px); font-weight: 700; line-height: 1.2; letter-spacing: -.01em; white-space: nowrap; }
@media (max-width: 480px) { .dn-ten b { white-space: normal; } }
.dn-ten b { color: #1B2A4E; }
.dn-ten i { font-size: 18px; font-weight: 600; color: #A87A06; }
.dn-gioi-thieu h1 { font-size: clamp(22px, 2.6vw, 28px); font-weight: 700; color: #1B2A4E; max-width: 22ch; line-height: 1.35; padding-top: 18px; border-top: 2px solid #E9BE52; }
.dn-y { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 12px; font-size: 16px; color: #2C3A58; }
.dn-y li { display: flex; gap: 12px; align-items: flex-start; }
.dn-y li span { flex: none; width: 24px; height: 24px; border-radius: 50%; display: grid; place-items: center; font-size: 13px; font-weight: 700; color: #E9BE52; background: #1B2A4E; margin-top: 1px; }
.dn-cam-ket { margin: 0; font-size: 14px; color: #5A6580; max-width: 46ch; }
.dn-the { background: #fff; color: #16203A; border-radius: 16px; padding: 34px 32px; box-shadow: 0 24px 60px rgba(4, 10, 25, .45); border-top: 4px solid #E2B23C; color-scheme: light; }
.dn-the h2 { font-size: 24px; margin-bottom: 4px; color: #1B2A4E; }
.dn-the .muted { color: #5A6580; }
.dn-the p.muted { margin: 0 0 22px; font-size: 15px; }
.dn-the .field label { color: #16203A; }
.dn-the .field input:not([type=checkbox]) { background: #fff; border-color: #DCE1EC; color: #16203A; }
.dn-the .field input:focus { border-color: #1B2A4E; }
.dn-the .check { color: #16203A; }
.dn-the .check input { accent-color: #1B2A4E; }
.dn-the .flash.bad { background: #FBE7E5; color: #B3261E; }
.dn-nut { width: 100%; background: #1B2A4E; border-color: #1B2A4E; color: #fff; min-height: 48px; font-size: 16px; }
.dn-nut:hover { background: #24365F; }
@media (max-width: 820px) {
  .dn { grid-template-columns: 1fr; gap: 26px; }
  .dn-gioi-thieu h1, .dn-y, .dn-cam-ket { display: none; }
  .dn-thuong-hieu { justify-content: center; }
  .dn-logo { width: 64px; height: 64px; border-radius: 14px; }
  .dn-the { padding: 26px 22px; }
}

/* Menu admin chia nhóm Giáo viên / Quản trị */
.band .wrap { max-width: 1400px; }
.nav-nhom { display: inline-flex; align-items: center; gap: 2px; flex-wrap: nowrap; white-space: nowrap; padding: 2px 4px; border-radius: 8px; }
@media (max-width: 700px) { .nav-nhom { flex-wrap: wrap; white-space: normal; } .nav-nhom + .nav-nhom { margin-left: 0; padding-left: 4px; border-left: 0; } }
.nav-nhom + .nav-nhom { margin-left: 6px; padding-left: 10px; border-left: 1px solid rgba(233, 190, 82, .45); }
.nav-nhan { font-size: 11px; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: var(--gold-bright); padding: 0 6px 0 2px; }
.nav-dem { display: inline-grid; place-items: center; min-width: 20px; height: 20px; padding: 0 6px; margin-left: 6px; border-radius: 999px; background: #D93025; color: #fff; font-size: 12px; font-weight: 700; }

/* Cảnh báo dùng chung tài khoản */
.cb { border-left: 5px solid var(--tt-do); }
.cb.cb-cao { border-left-color: var(--bad); }
.cb-ly-do { margin: 10px 0 12px; padding-left: 20px; display: flex; flex-direction: column; gap: 4px; font-weight: 600; }
.cb-cao .cb-ly-do { color: var(--bad); }
.cb .row form { margin: 0; }

/* Trang sửa đề */
.sua-cau { scroll-margin-top: 20px; }
.sua-cau:target { box-shadow: 0 0 0 3px var(--gold-bright); }
.sua-tx { min-height: 0 !important; font-family: var(--f-body) !important; font-size: 15px !important; }
.sua-pa { display: flex; flex-direction: column; gap: 8px; }
.sua-dong { display: flex; align-items: center; gap: 10px; padding: 8px 10px; border: 1.5px solid var(--line); border-radius: 8px; cursor: pointer; }
.sua-dong input[type=radio] { width: 18px; height: 18px; accent-color: var(--ok); flex: none; }
.sua-dong .input { flex: 1; min-width: 0; min-height: 38px; }
.sua-dong .opt-img { max-height: 80px; }
.sua-dong.dung { border-color: var(--ok); background: var(--ok-soft); }
.sua-dong.dung .bub { background: var(--ok); border-color: var(--ok); color: var(--surface); }

/* Trạng thái học tập: xám = chưa làm/chưa xem, cam = chưa hoàn thành, xanh lá = hoàn thành/đã xem */
:root { --tt-chua: #6B7385; --tt-chua-nen: #EEF0F4; --tt-do: #B45309; --tt-do-nen: #FFF1DC; --tt-xong: #1D7A45; --tt-xong-nen: #E2F3E9; }
@media (prefers-color-scheme: dark) { :root { --tt-chua: #A3ACBF; --tt-chua-nen: #232C44; --tt-do: #F5A54A; --tt-do-nen: #3A2812; --tt-xong: #5CC98A; --tt-xong-nen: #12301F; } }
.tt { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; font-weight: 700; padding: 3px 10px; border-radius: 999px; white-space: nowrap; }
.tt::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: currentColor; }
.tt.tt-chua { color: var(--tt-chua); background: var(--tt-chua-nen); }
.tt.tt-do { color: var(--tt-do); background: var(--tt-do-nen); }
.tt.tt-xong { color: var(--tt-xong); background: var(--tt-xong-nen); }
.exam.tt-chua { border-left: 5px solid var(--tt-chua); }
.exam.tt-do { border-left: 5px solid var(--tt-do); }
.exam.tt-xong { border-left: 5px solid var(--tt-xong); }
a.tt { text-decoration: none; }
a.tt:hover { filter: brightness(.95); outline: 1px solid currentColor; }
.tt-dong { display: flex; justify-content: space-between; align-items: center; gap: 8px; flex-wrap: wrap; }
.xem-info { font-size: 14px; color: var(--muted); line-height: 1.6; }
.xem-info b { color: var(--ink); }
.dem-tt { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 16px; }

/* Câu hỏi có hình: nền ảnh luôn trắng để nét vẽ kĩ thuật rõ cả khi máy để chế độ tối */
.q-img { display: block; max-width: min(100%, 380px); max-height: 300px; height: auto; margin: 0 0 12px; background: #fff; border: 1px solid var(--line); border-radius: 8px; padding: 8px; }
.opt-img { display: block; max-width: 100%; max-height: 130px; height: auto; background: #fff; border-radius: 6px; padding: 4px; }
.opts-hinh { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 170px), 1fr)); }
.opts-hinh .opt { align-items: center; }
.opts-hinh .ot { display: flex; flex-direction: column; gap: 4px; }

/* Phiếu tài khoản: 2 cột × 5 dòng trên A4 */
.slips { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 320px), 1fr)); gap: 12px; }
.slip { background: #fff; color: #16203A; border: 1.5px dashed #9AA5BE; border-radius: 8px; padding: 12px 16px; break-inside: avoid; display: flex; flex-direction: column; gap: 4px; }
.slip-h { display: flex; gap: 10px; align-items: center; border-bottom: 1px solid #DCE1EC; padding-bottom: 6px; }
.slip-h b { display: block; font-size: 12px; letter-spacing: .12em; }
.slip-h i { font-size: 12px; color: #A87A06; }
.slip-ten { font-size: 18px; font-weight: 700; margin-top: 4px; }
.slip-lop { font-size: 13px; color: #5A6580; }
.slip dl { display: grid; grid-template-columns: auto 1fr; gap: 2px 12px; margin: 6px 0 0; font-size: 14px; }
.slip dt { color: #5A6580; }
.slip dd { margin: 0; font-weight: 600; overflow-wrap: anywhere; }
.slip dd.big { font-size: 18px; letter-spacing: .03em; }
.slip-note { font-size: 12px; color: #5A6580; margin-top: 4px; }
@media print {
  @page { size: A4; margin: 10mm; }
  body { background: #fff; display: block; }
  .band, footer.foot, .no-print, .flash { display: none !important; }
  main.main { padding: 0; max-width: none; }
  .slips { grid-template-columns: 1fr 1fr; gap: 6mm; }
  .slip { height: 50mm; }
}

@media (prefers-reduced-motion: reduce) { * { transition: none !important; scroll-behavior: auto !important; } }

/* W-18: bảng nội dung theo kỳ, trường, lớp và môn. */
.ql-boloc { display:grid; grid-template-columns:1fr 1.2fr 1.5fr .8fr auto; gap:16px; align-items:end; margin-bottom:20px }
.ql-boloc .field { margin:0; min-width:0 }
.ql-phamvi { display:flex; justify-content:space-between; gap:12px; flex-wrap:wrap; margin:24px 0 16px; color:var(--muted) }
.ql-phamvi b { color:var(--ink); font-size:20px }
.ql-stats .stat b span { font-size:20px; color:var(--muted) }
.ql-chuthich { margin:0 0 20px }
.ql-danhsach { display:grid; gap:22px }
.ql-mon { border:1px solid var(--line); border-radius:var(--r); background:var(--surface); overflow:hidden }
.ql-mon-dau { padding:18px 22px; display:flex; gap:12px; justify-content:space-between; align-items:center; background:var(--surface-2); border-bottom:1px solid var(--line) }
.ql-mon-dau h2 { margin:0; font-size:21px }
.ql-hai-cot { display:grid; grid-template-columns:1fr 1fr }
.ql-loai { padding:20px; min-width:0 }
.ql-loai + .ql-loai { border-left:1px solid var(--line) }
.ql-loai-dau { display:flex; align-items:center; justify-content:space-between; flex-wrap:wrap; gap:12px; margin-bottom:16px }
.ql-loai-dau h3 { font-size:16px; margin:0 }
.ql-them { font-size:13px; padding:9px 12px; white-space:normal }
.ql-dem { color:var(--muted); margin-left:6px }
.ql-thieu { border:1px dashed var(--line); border-radius:8px; padding:18px; background:var(--surface-2) }
.ql-thieu p { color:var(--muted); font-size:14px; margin:8px 0 0 }
.ql-muc { border:1px solid var(--line); border-radius:8px; padding:16px; margin-top:12px; overflow-wrap:anywhere }
.ql-muc > b { font-size:16px; display:block; margin-bottom:10px }
.ql-muc p { margin:10px 0 }
.ql-nhan, .ql-tacvu { display:flex; flex-wrap:wrap; gap:8px }
.ql-tacvu { border-top:1px solid var(--line); padding-top:12px; gap:8px 16px; font-size:13px }
.ql-tacvu form { margin:0 }
.ql-tacvu .linkbtn { font:inherit }
.ql-chua-xep { margin-top:28px; scroll-margin-top:24px }
.ql-chua-dong { display:flex; justify-content:space-between; align-items:center; gap:18px; padding:16px 0; border-top:1px solid var(--line) }
.ql-chua-dong > div { min-width:0; overflow-wrap:anywhere }
.ql-popup { width:min(650px,calc(100vw - 28px)); max-height:90dvh; padding:26px; border:1px solid var(--line); border-radius:14px; background:var(--surface); color:var(--ink); box-shadow:0 20px 80px #0005 }
.ql-popup::backdrop { background:#081329aa }
.ql-popup-dau { display:flex; align-items:start; justify-content:space-between; gap:18px; margin-bottom:14px }
.ql-popup-dau h2 { margin:0; font-size:22px }
.ql-dong { border:0; background:transparent; color:var(--ink); cursor:pointer; font-size:30px; padding:0 6px; line-height:1 }
.ql-popup-phamvi { background:var(--accent-soft); padding:12px; border-radius:8px; font-size:14px }
.ql-popup-cuoi { display:flex; flex-wrap:wrap; gap:12px; margin-top:22px }
.ql-macdinh { background:var(--gold-soft); color:var(--ink); padding:14px; border-radius:8px; margin:16px 0 }
.ql-macdinh p { margin:5px 0 0 }
.ql-check { display:flex; gap:10px; align-items:start; margin:12px 0; font-size:15px }
.ql-check input { width:auto; margin-top:5px; accent-color:var(--accent) }
.ql-spinner { display:inline-block; width:26px; height:26px; border:3px solid var(--line); border-top-color:var(--gold); border-radius:50%; animation:ql-quay .8s linear infinite; vertical-align:middle }
.ql-dang-luu { margin-top:18px }
@keyframes ql-quay { to { transform:rotate(360deg) } }
@media (prefers-reduced-motion:reduce) { .ql-spinner { animation-duration:2s } }
@media (max-width:1000px) { .ql-boloc { grid-template-columns:1fr 1fr } .ql-boloc .btn { grid-column:1 / -1 } }
@media (max-width:700px) {
  .ql-hai-cot { grid-template-columns:1fr }
  .ql-loai + .ql-loai { border-left:0; border-top:1px solid var(--line) }
  .ql-mon-dau { padding:16px; align-items:start }
  .ql-mon-dau h2 { font-size:18px }
  .ql-loai { padding:16px }
  .ql-chua-dong { align-items:start; flex-direction:column }
  .ql-popup { padding:20px }
  .ql-boloc { gap:12px; padding:16px }
  .ql-stats { grid-template-columns:1fr 1fr }
}
@media (max-width:700px) { .ql-boloc .field:has(#Truong) { grid-column:1 / -1 } }

/* W-19: một hàng mỗi môn, thông tin bài và xếp hạng cùng một đề. */
.hs-danhsach { display:grid; gap:20px }
.hs-mon { background:var(--surface); border:1px solid var(--line); border-radius:12px; overflow:hidden }
.hs-mon-dau { display:flex; align-items:center; justify-content:space-between; gap:16px; padding:14px 18px; background:var(--surface-2); border-bottom:1px solid var(--line) }
.hs-mon-dau h2 { margin:2px 0 0; font-size:20px }
.hs-mon-dau .eyebrow { font-size:11px }
.hs-chon { width:min(50%,360px); min-width:0 }
.hs-chon label { font-size:12px; color:var(--muted); display:block; margin-bottom:4px }
.hs-chon select { width:100%; padding:8px; font-size:13px }
.hs-de { display:grid; grid-template-columns:minmax(0,1fr) minmax(0,1fr) }
.hs-de[hidden] { display:none }
.hs-thongtin.exam { border:0; border-left:4px solid var(--tt-chua); border-radius:0; padding:18px }
.hs-thongtin.exam.tt-do { border-left-color:var(--tt-do) }
.hs-thongtin.exam.tt-xong { border-left-color:var(--tt-xong) }
.hs-thongtin h3 { font-size:19px; line-height:1.45; margin:4px 0 }
.hs-thongtin .tt { font-size:12px }
.hs-thongtin .foot { margin-top:8px }
.hs-mota { overflow-wrap:anywhere }
.hs-xephang { padding:16px 18px; border-left:1px solid var(--line); min-width:0 }
.hs-xh-dau { display:flex; align-items:center; justify-content:space-between; flex-wrap:wrap; gap:6px }
.hs-xh-dau h3 { margin:0; font-size:16px }
.hs-quytac { color:var(--muted); font-size:12px; margin:5px 0 12px }
.hs-podium { display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); align-items:end; gap:10px; padding-top:8px }
.hs-top { grid-row:1; display:flex; flex-direction:column; align-items:center; text-align:center; min-width:0; gap:3px }
.hs-top-1 { grid-column:2 }
.hs-top-2 { grid-column:1 }
.hs-top-3 { grid-column:3 }
.hs-avatar { width:32px; height:32px; display:grid; place-items:center; border-radius:50%; background:var(--accent-soft); color:var(--accent); font-size:12px; font-weight:700 }
.hs-giai-1 .hs-avatar { outline:2px solid var(--gold-bright); outline-offset:2px }
.hs-ten { font-size:13px; line-height:1.35; overflow-wrap:anywhere }
.hs-ten small { color:var(--muted); font-size:11px }
.hs-diem { color:var(--ok); font-weight:700; font-size:13px }
.hs-diem small { font-size:11px; font-weight:500 }
.hs-tocdo { font-size:11px; color:var(--muted); font-variant-numeric:tabular-nums }
.hs-buc { position:relative; width:100%; height:66px; background:var(--surface-2); border:1px solid var(--line); border-radius:10px 10px 4px 4px; display:grid; place-items:center; margin-top:5px }
.hs-giai-1 .hs-buc { height:92px; border-color:var(--gold-bright); background:var(--gold-soft); box-shadow:0 0 15px #d4a01718 }
.hs-giai-2 .hs-buc { height:70px; border-color:var(--muted) }
.hs-giai-3 .hs-buc { height:54px; border-color:var(--warn) }
.hs-sohang { position:absolute; top:5px; right:5px; font-size:11px; font-weight:700; color:var(--ink) }
.hs-cup { font-size:32px; padding-top:8px; line-height:1 }
.hs-giai-1 .hs-cup { font-size:40px }
.hs-hang-em { margin:12px 0 8px; padding:8px 10px; border-radius:6px; background:var(--accent-soft); font-size:12px }
.hs-chitiet { font-size:12px }
.hs-chitiet summary { cursor:pointer; color:var(--accent); padding:5px 0 }
.hs-bang { list-style:none; padding:0; margin:8px 0 0; font-variant-numeric:tabular-nums }
.hs-bang li { display:grid; grid-template-columns:28px minmax(0,1fr) auto; align-items:center; gap:6px; padding:9px 4px; border-top:1px solid var(--line); border-radius:4px }
.hs-bang b { font-size:12px; overflow-wrap:anywhere }
.hs-bang small { display:block; color:var(--muted); font-size:10px; margin-top:3px }
.hs-bang li > span:last-child { text-align:right }
.hs-bang .hs-la-em { background:var(--accent-soft) }
.hs-thu-hang { color:var(--muted); font-weight:700 }
.hs-phamvi { font-size:11px; color:var(--muted); margin:10px 0 0 }
.hs-xh-rong { font-size:14px; color:var(--muted); padding:20px 0 }
@media(max-width:700px) {
  .hs-danhsach { gap:14px }
  .hs-mon-dau { padding:10px 12px; gap:8px }
  .hs-mon-dau h2 { font-size:17px }
  .hs-chon { width:55% }
  .hs-chon select { font-size:12px }
  .hs-thongtin.exam { padding:12px 10px; gap:7px; border-left-width:3px }
  .hs-thongtin .tt-dong { flex-wrap:wrap; gap:6px }
  .hs-thongtin .tt-dong > .eyebrow { display:none }
  .hs-thongtin h3 { font-size:14px; margin:2px 0 }
  .hs-thongtin .meta, .hs-thongtin .small { font-size:12px; line-height:1.5 }
  .hs-thongtin .meta { gap:4px 8px }
  .hs-thongtin .best { font-size:11px; flex-wrap:wrap; gap:2px 6px }
  .hs-thongtin .best b { font-size:20px }
  .hs-thongtin .foot { gap:9px; margin-top:4px }
  .hs-thongtin .foot form { width:100% }
  .hs-thongtin .foot .btn { font-size:12px; padding:10px 8px; width:100%; white-space:normal }
  .hs-thongtin .foot .linkbtn { font-size:12px }
  .hs-mota { font-size:12px }
  .hs-xephang { padding:12px 8px }
  .hs-xh-dau h3 { font-size:13px }
  .hs-xh-dau .small { font-size:10px }
  .hs-quytac { font-size:10px; line-height:1.5; margin:6px 0 10px }
  .hs-podium { gap:4px; padding-top:5px }
  .hs-avatar { width:24px; height:24px; font-size:10px }
  .hs-ten { font-size:11px; line-height:1.35 }
  .hs-ten small { font-size:10px }
  .hs-diem { font-size:11px }
  .hs-diem small { font-size:9px }
  .hs-buc { border-radius:7px 7px 3px 3px }
  .hs-giai-1 .hs-buc { height:70px }
  .hs-giai-2 .hs-buc { height:54px }
  .hs-giai-3 .hs-buc { height:42px }
  .hs-cup { font-size:23px }
  .hs-giai-1 .hs-cup { font-size:30px }
  .hs-sohang { font-size:10px; right:3px; top:3px }
  .hs-hang-em { font-size:11px; padding:7px; line-height:1.5 }
  .hs-phamvi { font-size:10px; line-height:1.4 }
  .hs-xh-rong { font-size:12px; padding:12px 0 }
  .hs-chitiet { font-size:11px }
  .hs-bang li { grid-template-columns:20px minmax(0,1fr); gap:4px }
  .hs-bang li > span:last-child { grid-column:2; text-align:left; display:flex; gap:8px; align-items:baseline }
}
@media(max-width:350px) { .hs-de { grid-template-columns:1fr } .hs-xephang { border-left:0; border-top:1px solid var(--line) } }
@media(max-width:700px) {
  .trang-hoc-sinh .band-in { gap:6px 10px; padding-block:9px }
  .trang-hoc-sinh .logo-o { width:34px; height:34px }
  .trang-hoc-sinh .brand-t b { font-size:11px; letter-spacing:.08em }
  .trang-hoc-sinh .brand-t i { font-size:11px }
  .trang-hoc-sinh .nav { flex:none; width:100%; gap:6px }
  .trang-hoc-sinh .nav a { padding:5px 9px; font-size:12px }
  .trang-hoc-sinh .who { font-size:11px; gap:6px }
  .trang-hoc-sinh .who .ten, .trang-hoc-sinh .who .vt { display:none }
  .trang-hoc-sinh .who a, .trang-hoc-sinh .who button { font-size:11px; padding:2px 5px }
  .trang-hoc-sinh .page-head { margin-bottom:10px }
  .trang-hoc-sinh .page-head h1 { font-size:21px }
  .trang-hoc-sinh .page-head p { font-size:12px }
  .trang-hoc-sinh .tabs { display:grid; grid-template-columns:1fr 1fr; overflow:visible; margin-bottom:12px }
  .trang-hoc-sinh .tabs a { white-space:normal; font-size:12px; padding:8px 5px; line-height:1.4; justify-content:center; gap:5px }
  .trang-hoc-sinh .tabs a span { font-size:11px; padding:0 5px }
  .trang-hoc-sinh .filters { margin-bottom:12px; padding:0 }
  .trang-hoc-sinh .filters .field { margin-bottom:0 }
}
@media(min-width:701px) { .trang-hoc-sinh .tabs { overflow-y:hidden } }

/* Màu đi kèm nhãn chữ để vẫn phân biệt được trạng thái khi không thấy màu. */
.ql-stats .stat { border-top: 4px solid var(--line); }
.ql-stats .ql-stat-du { border-color: var(--ok); background: var(--ok-soft); }
.ql-stats .ql-stat-thieu { border-color: var(--warn); background: var(--warn-soft); }
.ql-stats .ql-stat-bai { border-color: var(--ql-bai); background: var(--ql-bai-nen); }
.ql-stats .ql-stat-dapan { border-color: var(--ql-dapan); background: var(--ql-dapan-nen); }
.ql-stat-du b { color: var(--ok); } .ql-stat-thieu b { color: var(--warn); }
.ql-stat-bai b { color: var(--ql-bai); } .ql-stat-dapan b { color: var(--ql-dapan); }
.ql-mon.ql-du { border-top: 4px solid var(--ok); }
.ql-mon.ql-chua-du { border-top: 4px solid var(--warn); }
.ql-du .ql-mon-dau { background: var(--ok-soft); }
.ql-chua-du .ql-mon-dau { background: var(--warn-soft); }
.ql-trac-nghiem { --ql-mau: var(--ql-bai); --ql-nen: var(--ql-bai-nen); }
.ql-de-cuong { --ql-mau: var(--ql-dapan); --ql-nen: var(--ql-dapan-nen); }
.ql-loai .ql-loai-dau { padding: 10px; border-radius: var(--r); background: var(--ql-nen); }
.ql-loai .ql-loai-dau h3, .ql-loai .ql-dem { color: var(--ql-mau); }
.ql-loai .ql-them { color: var(--ql-mau); border-color: var(--ql-mau); background: var(--surface); }
.ql-loai .ql-muc { border-left: 4px solid var(--ql-mau); }
.ql-loai .ql-thieu { background: var(--warn-soft); border-color: var(--warn); }
#ql-tai { display: flex; align-items: center; gap: 10px; padding: 12px 16px; color: var(--accent); background: var(--accent-soft); border-radius: var(--r); }
#ql-ket-qua[aria-busy="true"] { opacity: .5; }
@media (prefers-reduced-motion: reduce) { .ql-spinner { animation: none; } }
/* Góc học tập: hai tab rõ màu, tên ngắn cho điện thoại. */
.hs-tabs { display:flex; gap:10px; border:0; margin:18px 0 22px; }
.hs-tabs a { flex:1; display:flex; align-items:center; justify-content:center; gap:7px; border:2px solid transparent; border-radius:12px; padding:12px 8px; font-size:16px; text-align:center; text-decoration:none; }
.hs-tabs .hs-tab-tn { color:var(--ql-bai); background:var(--ql-bai-nen); }
.hs-tabs .hs-tab-dapan { color:var(--ql-dapan); background:var(--ql-dapan-nen); }
.hs-tabs .hs-tab-tn.on { border-color:var(--ql-bai); box-shadow:none; }
.hs-tabs .hs-tab-dapan.on { border-color:var(--ql-dapan); box-shadow:none; }
.hs-new { display:inline-flex; vertical-align:middle; padding:3px 8px; border-radius:6px; background:var(--bad-soft); color:var(--bad); font-size:12px; font-weight:800; line-height:1.3; }
.hs-xem-thu { border-top:4px solid var(--gold); margin-bottom:24px; }
.hs-xem-thu .filters { align-items:end; flex-wrap:wrap; }
.hs-cau-thu { margin-top:18px; }
.hs-anh-thu { display:block; max-width:100%; max-height:380px; object-fit:contain; }
@media(max-width:480px) { .hs-tabs { gap:7px; } .hs-tabs a { font-size:14px; padding:12px 5px; } .hs-tabs a span { font-size:12px; } }
/* W-26: sheet quản lý và bố cục cảm ứng. */
.nav-mobile { display:none }
.ql-tacvu { gap:8px }
.ql-tacvu a,.ql-tacvu .linkbtn { display:inline-flex;align-items:center;justify-content:center;min-height:44px;min-width:44px;padding:9px 12px;border:1px solid var(--line);border-radius:10px;text-decoration:none;background:var(--surface-2);color:var(--ink);text-align:center }
.ql-trac-nghiem .ql-tacvu a,.ql-trac-nghiem .ql-tacvu .linkbtn { color:var(--ql-bai) }
.ql-de-cuong .ql-tacvu a,.ql-de-cuong .ql-tacvu .linkbtn { color:var(--ql-dapan) }
.ql-tacvu .linkbtn.danger { color:var(--bad);background:var(--bad-soft);border-color:var(--bad) }
.ql-tacvu a:hover,.ql-tacvu .linkbtn:hover { background:var(--accent-soft) }
.ql-tacvu :focus-visible,.ql-popup :focus-visible { outline:3px solid var(--gold);outline-offset:3px }
.ql-tim-nhanh { display:flex;align-items:center;justify-content:space-between;gap:16px;margin:18px 0 }
.ql-tim-nhanh p { margin:5px 0 0 }
.ql-dong { min-width:44px;min-height:44px;border-radius:50%;background:var(--surface-2);flex-shrink:0 }
.ql-popup-dau { align-items:center }
.ql-popup[open] { overscroll-behavior:contain }
body:has(dialog[open]) { overflow:hidden }
.ql-trang-popup { width:min(1120px,calc(100vw - 32px));height:90dvh;max-height:90dvh;padding:18px }
.ql-trang-popup[open] { display:flex;flex-direction:column }
.ql-trang-popup .ql-popup-dau { flex-shrink:0;margin-bottom:8px }
.ql-trang-popup .ql-popup-phamvi { margin:0 0 8px;padding:8px 12px }
#ql-trang-frame { width:100%;flex:1;min-height:0;border:1px solid var(--line);border-radius:10px;background:var(--bg) }
.ql-trong-popup .band,.ql-trong-popup .foot { display:none }
.ql-trong-popup .main { padding:18px 14px;width:100% }
.ql-trong-popup .page-head h1 { font-size:24px }
.ql-trong-popup .page-head .eyebrow { display:none }
.ql-trong-popup .page-head { margin-bottom:18px }
.ql-tim-form { display:grid;grid-template-columns:2fr 2fr 1fr auto;gap:14px;align-items:end }
.ql-tim-form .field { margin:0;min-width:0 }
.tc-danhsach,.tc-luot { display:grid;gap:12px }
.tc-hocsinh { display:grid;grid-template-columns:2fr 1.3fr 1fr auto;align-items:center;gap:16px;padding:18px }
.tc-hocsinh p { margin:5px 0 0 }
.tc-chon { border:2px solid var(--ql-bai);background:var(--ql-bai-nen) }
.tc-phantrang { margin:16px 0;flex-wrap:wrap }
.tc-chitiet { padding-top:20px;scroll-margin-top:15px }
.tc-luot { grid-template-columns:repeat(2,minmax(0,1fr)) }
.tc-luot-dau { display:flex;align-items:start;justify-content:space-between;gap:14px }
.tc-luot-dau .pill { flex-shrink:0 }
@media(max-width:800px) {
 .ql-tim-form { grid-template-columns:1fr 1fr }
 .ql-tim-form .field:first-child { grid-column:1/-1 }
 .tc-hocsinh { grid-template-columns:1fr 1fr }
 .tc-hocsinh>div:first-child,.tc-hocsinh>a { grid-column:1/-1 }
 .tc-luot { grid-template-columns:1fr }
}
@media(max-width:700px) {
 .band-in { display:grid;grid-template-columns:minmax(0,1fr);gap:8px }
 .band-quanly .band-in { grid-template-columns:minmax(0,1fr) auto }
 .nav-mobile { display:inline-flex;align-items:center;min-height:44px;padding:8px 10px;border:1px solid var(--gold-bright);border-radius:10px;background:var(--band-2);color:var(--band-ink);font:inherit }
 .band-quanly .nav,.band-quanly .who { display:none;grid-column:1/-1 }
 .band-quanly.menu-mo .nav,.band-quanly.menu-mo .who { display:flex }
 .nav { display:flex;flex-wrap:wrap;width:100%;gap:4px }
 .nav-nhom { display:contents }
 .nav-nhan { display:none }
 .nav a { display:inline-flex;align-items:center;min-height:44px;padding:8px 10px;white-space:normal }
 .who { display:flex;flex-wrap:wrap;gap:4px 8px;width:100%;margin-left:0 }
 .who a,.who button { min-height:44px;display:inline-flex;align-items:center }
 input:not([type=checkbox]):not([type=radio]),select,textarea { font-size:16px }
 .btn { min-height:44px }
 .ql-mon-dau { flex-wrap:wrap }
 .ql-loai-dau { align-items:stretch }
 .ql-loai-dau h3 { font-size:16px }
 .ql-them { font-size:13px }
 .ql-tacvu { display:grid;grid-template-columns:repeat(2,minmax(0,1fr)) }
 .ql-tacvu a,.ql-tacvu .linkbtn { width:100%;font-size:13px }
 .ql-tacvu form { min-width:0 }
 .ql-tim-nhanh { align-items:stretch;flex-direction:column;padding:16px }
 .ql-popup { width:calc(100vw - 16px);max-height:calc(100dvh - 16px);padding:16px;padding-bottom:max(16px,env(safe-area-inset-bottom)) }
 .ql-popup-dau h2 { font-size:19px }
 .ql-trang-popup { width:100%;max-width:none;height:calc(100dvh - env(safe-area-inset-top) - 8px);max-height:calc(100dvh - 8px);margin:auto 0 0;border-radius:18px 18px 0 0;padding:12px 8px max(8px,env(safe-area-inset-bottom)) }
 .ql-trong-popup .split,.ql-trong-popup .grid2 { grid-template-columns:minmax(0,1fr) }
}
@media(prefers-reduced-motion:reduce) { .ql-popup *,.ql-tacvu * { scroll-behavior:auto;transition:none } }

/* ===== W-39 Thư viện đề thi (quản trị) ===== */
.tv-boloc { display:grid; grid-template-columns:1.2fr 1fr 1.2fr .8fr auto; gap:12px; align-items:end; margin-bottom:16px; }
.tv-boloc .field { margin:0; }
.tv-boloc .hint { font-size:12px; }
.tv-boloc .btn { margin-bottom:22px; }
.tv-tom { margin:-6px 0 14px; }
.tv-luoi { display:grid; grid-template-columns:repeat(auto-fill, minmax(320px, 1fr)); gap:16px; margin-bottom:18px; }
.tv-mon { display:flex; flex-direction:column; gap:10px; }
.tv-mon-dau { display:flex; align-items:center; justify-content:space-between; gap:10px; }
.tv-mon-dau h2 { margin:0; font-size:19px; }
.tv-ds, .tv-teps { list-style:none; margin:0; padding:0; display:grid; gap:8px; }
.tv-de { border:1px solid var(--line); border-radius:8px; padding:10px 12px; background:var(--surface-2); }
.tv-de-dau { display:flex; justify-content:space-between; gap:8px; align-items:baseline; flex-wrap:wrap; }
.tv-ghichu { margin:4px 0 0; color:var(--muted); }
.tv-teps { margin-top:8px; gap:6px; }
.tv-teps li { display:flex; align-items:center; gap:8px; flex-wrap:wrap; font-size:14px; }
.tv-ten { flex:1 1 140px; min-width:0; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.tv-teps .acts { display:inline-flex; gap:10px; align-items:center; }
.tv-teps form { display:inline; }
.tv-duoi { font-size:11px; font-weight:800; padding:2px 6px; border-radius:5px; background:var(--accent-soft); color:var(--accent); }
.tv-duoi-pdf { background:var(--bad-soft); color:var(--bad); }
.tv-duoi-doc, .tv-duoi-docx { background:var(--ql-bai-nen); color:var(--ql-bai); }
.tv-duoi-png, .tv-duoi-jpg, .tv-duoi-jpeg { background:var(--ok-soft); color:var(--ok); }
.tv-sua { margin-top:8px; }
.tv-sua > summary, .tv-them > summary { list-style:none; cursor:pointer; display:inline-flex; }
.tv-sua > summary::-webkit-details-marker, .tv-them > summary::-webkit-details-marker { display:none; }
.tv-form { margin-top:10px; padding-top:10px; border-top:1px dashed var(--line); }
.tv-form .field { margin-bottom:10px; }
.tv-xoa { margin-top:8px; }
.tv-them { margin-top:auto; }
.tv-themmon { display:flex; gap:12px; align-items:flex-end; flex-wrap:wrap; }
.tv-themmon .field { margin:0; flex:1 1 260px; }
@media (max-width:900px) { .tv-boloc { grid-template-columns:1fr 1fr; } .tv-boloc .btn { grid-column:1 / -1; margin:0; } }
@media (max-width:480px) { .tv-luoi { grid-template-columns:1fr; } }

/* ===== W-40 Góc học tập: hiện đủ các đề của một môn ===== */
.hs-sobai { font-size:13px; font-weight:700; color:var(--muted); background:var(--surface); border:1px solid var(--line); border-radius:999px; padding:3px 10px; white-space:nowrap; }
.hs-mon .hs-de + .hs-de { border-top:1px solid var(--line); }
.hs-de { scroll-margin-top:90px; }
.hs-de:target .hs-thongtin { box-shadow:inset 4px 0 0 var(--gold-bright); }

/* ===== W-41 Thông báo đề mới và nhắc bài chưa làm ===== */
.hs-nhac { display:flex; gap:12px; align-items:flex-start; background:var(--warn-soft); color:var(--ink); border:1px solid var(--gold-bright); border-radius:10px; padding:12px 16px; margin-bottom:16px; }
.hs-nhac-icon { font-size:22px; line-height:1; }
.hs-nhac-ds { display:flex; flex-wrap:wrap; gap:6px 14px; margin-top:6px; font-size:14px; }
.hs-nhac-ds a { color:var(--accent); font-weight:600; }
.hs-tb { border:0; border-radius:14px; padding:22px; width:min(520px, calc(100vw - 32px)); background:var(--surface); color:var(--ink); box-shadow:0 20px 60px rgba(10,20,40,.35); }
.hs-tb::backdrop { background:rgba(16,24,44,.55); }
.hs-tb h2 { margin:0 0 6px; font-size:22px; }
.hs-tb-ds { list-style:none; padding:0; margin:14px 0; display:grid; gap:8px; max-height:50vh; overflow:auto; }
.hs-tb-ds li { display:flex; justify-content:space-between; align-items:center; gap:12px; border:1px solid var(--line); border-radius:10px; padding:10px 12px; background:var(--surface-2); }
.hs-tb-ds li > div { min-width:0; }
.hs-tb-ds .eyebrow { display:block; font-size:11px; }
.hs-tb-dong { display:flex; justify-content:flex-end; margin:0; }

/* ===== W-42 Học sinh đang online ===== */
.ol-cham { display:inline-block; width:9px; height:9px; border-radius:50%; background:#22A55B; box-shadow:0 0 0 3px rgba(34,165,91,.2); margin-right:7px; vertical-align:middle; flex:none; }
.nav-dem.nav-online { background:#1F8F50; }
.hs-online { background:var(--surface); border:1px solid var(--line); border-radius:10px; padding:10px 14px; min-width:0; max-width:420px; }
.hs-online-dau { display:flex; align-items:center; font-size:14px; }
.hs-online.rong .ol-cham { background:var(--muted); box-shadow:none; }
.hs-online-ds { list-style:none; margin:8px 0 0; padding:0; display:flex; flex-wrap:wrap; gap:6px; max-height:96px; overflow:auto; }
.hs-online-ds:empty { display:none; }
.hs-online-ds li { display:flex; align-items:center; gap:6px; font-size:13px; background:var(--surface-2); border:1px solid var(--line); border-radius:999px; padding:2px 10px 2px 2px; max-width:180px; white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
.hs-online-ds .hs-avatar { width:24px; height:24px; font-size:10px; flex:none; }
@media (max-width:700px) { .hs-online { max-width:none; width:100%; } }

/* ===== W-44 Góc học tập "lộ trình ôn tập" + chủ đề mùa thi (mẫu thầy duyệt 06/11/2026) ===== */
.sr-only { position:absolute; width:1px; height:1px; overflow:hidden; clip:rect(0 0 0 0); white-space:nowrap; }
body.mua-thi.trang-hoc-sinh { background-image:linear-gradient(rgba(35,93,168,.045) 1px, transparent 1px), linear-gradient(90deg, rgba(35,93,168,.045) 1px, transparent 1px); background-size:24px 24px; }
.mua-nhan { display:inline-flex; align-items:center; gap:6px; font-size:12px; font-weight:800; letter-spacing:.08em; text-transform:uppercase; color:#1B2A4E; background:var(--gold-bright); padding:4px 11px 4px 9px; border-radius:999px; white-space:nowrap; }
.mua-dong { display:none; background:var(--gold-bright); color:#1B2A4E; text-align:center; font-size:12px; font-weight:800; letter-spacing:.08em; padding:5px 12px; text-transform:uppercase; }
@media (max-width:760px) { .mua-nhan { display:none; } .mua-dong { display:block; } }

.gt-hero { display:grid; grid-template-columns:minmax(0,1.55fr) minmax(0,1fr); gap:16px; margin-bottom:18px; }
.gt-hero-chinh { position:relative; overflow:hidden; border-radius:16px; padding:24px 26px 22px 78px; color:#F4F1E8; background:radial-gradient(120% 140% at 100% 0%, #2C4378 0%, #1B2A4E 55%, #14203D 100%); }
.gt-hero-chinh::after { content:""; position:absolute; inset:0; pointer-events:none;
  background:linear-gradient(90deg, transparent 0 58px, rgba(226,92,92,.35) 58px 60px, transparent 60px), repeating-linear-gradient(180deg, transparent 0 31px, rgba(255,255,255,.05) 31px 32px); }
.gt-hero-chinh > * { position:relative; z-index:1; }
.gt-eyebrow { color:var(--gold-bright); font-size:12px; font-weight:800; letter-spacing:.14em; text-transform:uppercase; }
.gt-hero-chinh h1 { margin:6px 0 4px; font-size:30px; line-height:1.22; color:#fff; }
.gt-hero-chinh h1 em { font-style:normal; color:var(--gold-bright); }
.gt-hero-chinh p { margin:0; color:#C9D0E2; max-width:56ch; font-size:15px; }
.gt-so { display:flex; gap:10px; margin:16px 0 16px; flex-wrap:wrap; }
.gt-so div { background:rgba(255,255,255,.08); border:1px solid rgba(255,255,255,.16); border-radius:12px; padding:7px 14px; text-align:center; min-width:96px; }
.gt-so b { display:block; font-size:28px; line-height:1.1; color:#fff; font-variant-numeric:tabular-nums; }
.gt-so small { font-size:12px; color:#C9D0E2; }
.gt-cta { display:flex; gap:12px; align-items:center; flex-wrap:wrap; }
.gt-cta form { margin:0; }
.gt-cta .btn { white-space:normal; text-align:left; }
.gt-phu { color:#C9D0E2; font-size:13.5px; } .gt-phu b { color:#fff; }
.gt-xong { font-size:15px; color:#fff; }
.gt-hero-ben { display:grid; gap:12px; grid-template-rows:auto 1fr; }
.gt-tiendo { display:flex; gap:16px; align-items:center; padding:16px 18px; }
.gt-vong { --p:0; width:96px; height:96px; border-radius:50%; flex:none; display:grid; place-items:center; background:conic-gradient(var(--gold-bright) calc(var(--p)*1%), var(--accent-soft) 0); }
.gt-vong span { width:74px; height:74px; border-radius:50%; background:var(--surface); display:flex; flex-direction:column; align-items:center; justify-content:center; line-height:1.1; }
.gt-vong b { font-size:21px; } .gt-vong small { font-size:11px; color:var(--muted); }
.gt-tiendo h3 { margin:0 0 4px; font-size:16px; }
.gt-tiendo ul { list-style:none; margin:0; padding:0; font-size:13.5px; color:var(--muted); display:grid; gap:2px; }
.gt-tiendo li b { color:var(--ink); }
.gt-cham { display:inline-block; width:9px; height:9px; border-radius:50%; margin-right:6px; vertical-align:1px; }
.gt-chuoi { display:flex; flex-wrap:wrap; align-items:center; align-content:center; gap:10px 12px; padding:16px 18px; }
.gt-lua { font-size:28px; }
.gt-chuoi b { font-size:15px; } .gt-chuoi p { margin:0; font-size:13px; color:var(--muted); }
.gt-tuan { display:flex; gap:5px; width:100%; margin-left:40px; }
.gt-tuan i { width:30px; height:26px; border-radius:6px; background:var(--accent-soft); font-style:normal; font-size:11px; font-weight:700; color:var(--muted); display:grid; place-items:center; }
.gt-tuan i.x { background:var(--gold-bright); color:#1B2A4E; }

.gt-nhac { display:flex; gap:12px; align-items:center; background:var(--warn-soft); color:var(--ink); border:1px solid var(--gold-bright); border-radius:12px; padding:10px 16px; margin-bottom:18px; font-size:15px; }
.gt-nhac > div > b { color:var(--warn); }
.gt-nhac-icon { font-size:22px; line-height:1; }
.gt-nhac-ds { display:flex; flex-wrap:wrap; gap:6px; margin-top:5px; }
.gt-nhac-ds a { font-size:13px; font-weight:600; color:var(--accent); background:var(--surface); border:1px solid #EBD9A8; border-radius:999px; padding:2px 10px; text-decoration:none; }

.gt-khung { display:grid; grid-template-columns:minmax(0,1fr) 300px; gap:18px; align-items:start; }
.gt-tieude { display:flex; align-items:baseline; justify-content:space-between; gap:10px; margin:0 0 10px; flex-wrap:wrap; }
.gt-tieude h2 { margin:0; font-size:20px; }
.gt-tieude span { font-size:13px; color:var(--muted); }
.gt-thanh-loc { display:flex; gap:10px; align-items:center; justify-content:space-between; flex-wrap:wrap; margin-bottom:14px; }
.gt-tabs { display:flex; gap:6px; flex-wrap:wrap; }
.gt-tabs a { padding:8px 14px; border-radius:999px; text-decoration:none; font-weight:700; font-size:14px; color:var(--muted); background:var(--surface); border:1px solid var(--line); }
.gt-tabs a.on { background:var(--accent); color:var(--on-accent); border-color:var(--accent); }
.gt-tabs a span { margin-left:7px; font-size:12px; opacity:.8; }
.gt-chon-mon { margin:0; } .gt-chon-mon select { min-height:38px; padding:6px 10px; font-size:14px; width:auto; }
.gt-luoi { display:grid; gap:14px; }
.gt-mon { --mau:var(--accent); background:var(--surface); border:1px solid var(--line); border-left:5px solid var(--mau); border-radius:14px; overflow:hidden; }
.gt-mon-dau { display:flex; align-items:center; gap:12px; padding:12px 16px; background:linear-gradient(90deg, color-mix(in srgb, var(--mau) 9%, var(--surface)), var(--surface) 70%); border-bottom:1px solid var(--line); }
.gt-mon-ic { width:38px; height:38px; flex:none; border-radius:10px; display:grid; place-items:center; font-size:20px; background:color-mix(in srgb, var(--mau) 14%, var(--surface)); }
.gt-mon-dau h3 { margin:0; font-size:17px; display:flex; align-items:center; gap:8px; }
.gt-mon-phu { font-size:12.5px; color:var(--muted); }
.gt-thanh { margin-left:auto; width:150px; flex:none; }
.gt-thanh small { display:flex; justify-content:space-between; font-size:12px; color:var(--muted); }
.gt-thanh div { height:7px; background:var(--accent-soft); border-radius:99px; overflow:hidden; margin-top:3px; }
.gt-thanh div i { display:block; height:100%; background:var(--mau); border-radius:99px; }
.gt-bai { display:grid; grid-template-columns:minmax(0,1fr) auto auto; gap:6px 14px; align-items:center; padding:12px 16px; scroll-margin-top:90px; }
.gt-bai + .gt-bai { border-top:1px dashed var(--line); }
.gt-bai:target { box-shadow:inset 4px 0 0 var(--gold-bright); background:var(--gold-soft); }
.gt-bai-tt { min-width:0; }
.gt-bai h4 { margin:0; font-size:15px; line-height:1.4; display:flex; align-items:center; gap:6px 8px; flex-wrap:wrap; }
.gt-bai .tt { font-size:11.5px; }
.gt-mota { font-size:12.5px; color:var(--muted); margin-top:2px; display:-webkit-box; -webkit-line-clamp:2; -webkit-box-orient:vertical; overflow:hidden; }
.gt-meta { font-size:12.5px; color:var(--muted); margin-top:2px; }
.gt-meta b { color:var(--ink); }
.gt-diem { text-align:right; font-size:12px; color:var(--muted); min-width:84px; line-height:1.2; display:flex; flex-direction:column; align-items:flex-end; }
.gt-diem b { font-size:20px; color:var(--ok); }
.gt-diem b.gt-diem-do { color:#B45309; } .gt-diem b.gt-diem-dat { color:var(--ok); order:2; }
.gt-nut { display:flex; flex-direction:column; align-items:flex-end; gap:4px; }
.gt-nut form { margin:0; }
.gt-nut .linkbtn { font-size:12.5px; }
.gt-xh { grid-column:1 / -1; font-size:13.5px; }
.gt-xh summary { cursor:pointer; color:var(--accent); font-weight:600; font-size:13px; width:max-content; }
.gt-xh ol, .gt-bv ol { list-style:none; margin:8px 0 0; padding:0; display:grid; gap:4px; }
.gt-xh li, .gt-bv li { display:flex; align-items:center; gap:10px; padding:5px 8px; border-radius:9px; }
.gt-xh li.em, .gt-bv li.em { background:var(--gold-soft); outline:1px solid #EBD9A8; }
.gt-h { width:26px; text-align:center; font-weight:800; color:var(--muted); flex:none; }
.gt-ten { flex:1; min-width:0; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.gt-xh li small { color:var(--muted); font-size:12px; }
.gt-xh li b, .gt-bv li b { font-weight:800; }
.gt-xh .hs-avatar, .gt-bv .hs-avatar { width:28px; height:28px; font-size:11px; flex:none; }
.gt-ghichu { margin:8px 0 0; font-size:12.5px; color:var(--muted); }

.gt-phai { display:grid; gap:14px; position:sticky; top:16px; }
.gt-phai .card { padding:16px 18px; }
.gt-phai h3 { margin:0 0 8px; font-size:15px; }
.gt-bv li { font-size:14px; }
.gt-phai .hs-online { max-width:none; }
.gt-meo { background:linear-gradient(160deg, var(--gold-soft), var(--surface)); border-color:#EBD9A8; }
.gt-meo ol { margin:0; padding-left:18px; font-size:13.5px; display:grid; gap:4px; }
.gt-ky { margin-top:10px; font-size:12.5px; color:var(--gold); font-weight:700; }

@media (max-width:900px) {
  .gt-hero, .gt-khung { grid-template-columns:1fr; }
  .gt-phai { position:static; }
}
@media (max-width:640px) {
  .gt-hero-chinh { padding:18px 16px; }
  .gt-hero-chinh::after { background:repeating-linear-gradient(180deg, transparent 0 31px, rgba(255,255,255,.05) 31px 32px); }
  .gt-hero-chinh h1 { font-size:23px; }
  .gt-so { gap:7px; } .gt-so div { flex:1; min-width:0; padding:7px 4px; } .gt-so b { font-size:23px; }
  .gt-cta form, .gt-cta .btn { width:100%; } .gt-cta .btn { justify-content:center; text-align:center; }
  .gt-thanh { width:88px; }
  .gt-bai { grid-template-columns:1fr auto; }
  .gt-bai-tt { grid-column:1 / -1; }
  .gt-diem { align-items:flex-start; text-align:left; flex-direction:row; gap:5px; align-items:baseline; }
  .gt-diem b { font-size:16px; }
  .gt-tuan { margin-left:0; } .gt-tuan i { flex:1; width:auto; }
}

/* Trang đăng nhập theo mùa thi */
body.trang-dang-nhap.mua-thi { background:radial-gradient(120% 120% at 0% 0%, #2C4378 0%, #1B2A4E 50%, #111B34 100%) fixed; color:#F4F1E8; overflow-x:hidden; }
.dn-nen-mua { position:fixed; inset:0; pointer-events:none; color:rgba(255,255,255,.07); font-weight:800; z-index:0; }
.dn-nen-mua span { position:absolute; font-size:var(--c,34px); transform:rotate(var(--r,0deg)); white-space:nowrap; }
.mua-thi .dn { position:relative; z-index:1; }
.mua-thi .dn-gioi-thieu { position:relative; overflow:hidden; background:linear-gradient(160deg,#24365F,#1B2A4E); color:#F4F1E8; backdrop-filter:none; box-shadow:0 24px 60px rgba(4,10,25,.45); gap:16px; }
.mua-thi .dn-gioi-thieu::after { content:""; position:absolute; inset:0; pointer-events:none; background:linear-gradient(90deg, transparent 0 14px, rgba(226,92,92,.35) 14px 16px, transparent 16px), repeating-linear-gradient(180deg, transparent 0 31px, rgba(255,255,255,.06) 31px 32px); }
.mua-thi .dn-gioi-thieu > * { position:relative; z-index:1; }
.mua-thi .dn-ten b { color:#fff; } .mua-thi .dn-ten i { color:var(--gold-bright); }
.dn-mua { align-self:flex-start; display:inline-flex; gap:6px; align-items:center; background:var(--gold-bright); color:#1B2A4E; font-weight:800; font-size:12px; letter-spacing:.1em; text-transform:uppercase; padding:5px 12px; border-radius:999px; }
.mua-thi .dn-gioi-thieu h1 { display:block; color:#fff; border-top:0; padding-top:0; margin:0; max-width:none; }
.dn-mua-p { margin:-6px 0 0; color:#C9D0E2; font-size:15px; }
.mua-thi .dn-y { color:#E3E7F1; font-size:15px; }
.mua-thi .dn-y li span { background:rgba(226,178,60,.18); color:var(--gold-bright); border-radius:7px; }
.mua-thi .dn-nut { background:var(--gold-bright); border-color:var(--gold-bright); color:#1B2A4E; font-weight:800; }
.mua-thi .dn-nut:hover { background:#EBC15A; }
.dn-chuc { margin-top:16px; padding:11px 14px; border-radius:10px; background:#FFF5DA; border:1px solid #EBD9A8; font-size:14px; color:#16203A; }
.dn-chuc b { color:#8A5A00; }
.mua-thi .foot-dn { color:rgba(255,255,255,.6); }
/* W-44: nhãn mùa thi chiếm chỗ trên thanh đầu trang – giữ menu học sinh một hàng */
.mua-thi .nav { flex:1 1 auto; flex-wrap:nowrap; }
.mua-thi .nav a { white-space:nowrap; }
.gt-xh ol, .gt-bv ol { grid-template-columns:minmax(0,1fr); }
.gt-xh, .gt-xh li { min-width:0; }
.mua-thi .dn-ten b { white-space:normal; font-size:clamp(19px, 2vw, 24px); }
/* W-46: góc học tập hiện toàn bộ học sinh online – danh sách dọc, cuộn khi dài; bạn cùng lớp nhấn nhẹ */
.gt-phai .hs-online-phu { font-size:12.5px; color:var(--muted); margin:2px 0 0 18px; }
.gt-phai .hs-online-phu:empty { display:none; }
.gt-phai .hs-online-ds { flex-direction:column; flex-wrap:nowrap; gap:4px; max-height:320px; overscroll-behavior:contain; }
.gt-phai .hs-online-ds li { display:grid; grid-template-columns:auto minmax(0,1fr); column-gap:8px; max-width:none; border-radius:10px; padding:4px 10px 4px 4px; white-space:normal; }
.gt-phai .hs-online-ds li .hs-avatar { grid-row:span 2; }
.gt-phai .hs-online-ds .ol-ten { font-weight:600; white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
.gt-phai .hs-online-ds small { color:var(--muted); font-size:11.5px; white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
.gt-phai .hs-online-ds li.cung { background:#EAF6EF; border-color:#BFE0CC; }
/* ===== W-47 Giao diện học sinh "trang nhã" – phương án A xanh ngọc · giấy kem (thầy duyệt 06/11/2026) =====
   Chỉ áp cho trang học sinh (body.hs-nha). Thanh đầu trang quản trị khi xem thử (.band-quanly) giữ nguyên. */
body.hs-nha {
  --bg:#F6F3EC; --surface:#FFFFFF; --surface-2:#FBF9F4; --ink:#1E2B33; --muted:#646E73; --line:#E7E1D4;
  --accent:#1F5E5A; --on-accent:#FFFFFF; --accent-soft:#E4F0EE;
  --gold:#8E6A20; --gold-bright:#B88A2E; --gold-soft:#F6EDD9; --vien-vang:#EAD9B3;
  --ok:#3F7D5C; --ok-soft:#E6F1EA; --warn:#7A5A16; --warn-soft:#F6EDD9; --bad:#A8452A; --bad-soft:#F7E6DF;
  --tt-xong:#4E8A6A; --tt-xong-nen:#E6F1EA; --tt-do:#B8683A; --tt-do-nen:#F7E9DF; --tt-chua:#7D878C; --tt-chua-nen:#F3F0E8;
}
@media (prefers-color-scheme: dark) {
  body.hs-nha {
    --bg:#111816; --surface:#18211F; --surface-2:#1D2826; --ink:#E5ECE9; --muted:#9DABA6; --line:#2B3834;
    --accent:#7CC4BC; --on-accent:#0E1614; --accent-soft:#1D3330;
    --gold:#D9B46A; --gold-bright:#D9B46A; --gold-soft:#2C2617; --vien-vang:#4A3F22;
    --ok:#7BC59C; --ok-soft:#173025; --warn:#E3C27A; --warn-soft:#2C2617; --bad:#EE9C83; --bad-soft:#3A2119;
    --tt-xong:#7BC59C; --tt-xong-nen:#173025; --tt-do:#E9A57C; --tt-do-nen:#3A2719; --tt-chua:#9AA6A2; --tt-chua-nen:#222C2A;
  }
}
body.hs-nha.mua-thi.trang-hoc-sinh { background-image:none; }
.hs-nha .btn { border-radius:10px; }
.hs-nha .btn.gold { background:var(--accent); border-color:var(--accent); color:var(--on-accent); }
.hs-nha :focus-visible { outline-color:var(--gold-bright); }
/* Thanh đầu trang sáng, mảnh */
.hs-nha .band:not(.band-quanly) { background:var(--surface); color:var(--ink); border-bottom:1px solid var(--line); }
.hs-nha .band:not(.band-quanly) .logo-o { box-shadow:0 0 0 1px var(--line); }
.hs-nha .band:not(.band-quanly) .brand-t i { color:var(--gold-bright); font-style:italic; }
.hs-nha .band:not(.band-quanly) .nav a { color:var(--muted); opacity:1; border-radius:999px; padding:7px 14px; font-weight:500; }
.hs-nha .band:not(.band-quanly) .nav a:hover { background:var(--surface-2); }
.hs-nha .band:not(.band-quanly) .nav a.on { background:var(--accent-soft); color:var(--accent); box-shadow:none; font-weight:600; }
.hs-nha .band:not(.band-quanly) .who { color:var(--muted); margin-left:auto; }
.hs-nha .band:not(.band-quanly) .nav { flex:0 1 auto; }
@media (max-width:1440px) { .hs-nha.mua-thi .band:not(.band-quanly) .who .tdn { display:none; } }
.hs-nha .band:not(.band-quanly) .who .ten { color:var(--ink); }
.hs-nha .band:not(.band-quanly) .who .vt { border-color:var(--line); color:var(--accent); }
.hs-nha .band:not(.band-quanly) .who a, .hs-nha .band:not(.band-quanly) .who button { color:var(--muted); }
.hs-nha .mua-nhan { background:var(--gold-soft); color:var(--warn); box-shadow:inset 0 0 0 1px var(--vien-vang); }
.hs-nha .mua-dong { background:var(--gold-soft); color:var(--warn); border-bottom:1px solid var(--vien-vang); }
/* Lời chào: thẻ trắng, chữ có chân */
.hs-nha .gt-hero-chinh { background:var(--surface); color:var(--ink); border:1px solid var(--line); padding:24px 26px 22px; }
.hs-nha .gt-hero-chinh::after { background:radial-gradient(circle at 100% 0, var(--accent-soft) 0, transparent 34%); }
.hs-nha .gt-eyebrow { color:var(--gold-bright); font-weight:700; }
.hs-nha .gt-hero-chinh h1 { color:var(--ink); margin:8px 0 6px; }
.hs-nha .gt-hero-chinh h1 em { color:var(--accent); }
.hs-nha .gt-hero-chinh p { color:var(--muted); }
.hs-nha .gt-so { gap:10px 30px; margin:18px 0 20px; }
.hs-nha .gt-so div { background:none; border:0; padding:0; text-align:left; min-width:0; }
.hs-nha .gt-so b { color:var(--ink); font-family:var(--f-display); font-weight:600; font-size:27px; }
.hs-nha .gt-so small { color:var(--muted); font-size:13px; }
.hs-nha .gt-phu { color:var(--muted); } .hs-nha .gt-phu b { color:var(--ink); }
.hs-nha .gt-xong { color:var(--ok); font-weight:600; }
.hs-nha .gt-cta .btn { border-radius:12px; padding:11px 20px; }
.hs-nha .gt-hero-ben .card, .hs-nha .gt-phai .card, .hs-nha .gt-mon { border-radius:16px; }
.hs-nha .gt-vong { background:conic-gradient(var(--tt-xong) calc(var(--p)*1%), var(--accent-soft) 0); }
.hs-nha .gt-vong b { font-family:var(--f-display); font-weight:600; }
.hs-nha .gt-tiendo h3 { font-family:var(--f-display); }
.hs-nha .gt-tuan i { background:var(--surface-2); border:1px solid var(--line); color:var(--tt-chua); border-radius:8px; }
.hs-nha .gt-tuan i.x { background:var(--accent); border-color:var(--accent); color:var(--on-accent); }
.hs-nha .gt-tuan i.nay { box-shadow:0 0 0 2px var(--gold-bright); }
.hs-nha .gt-nhac { background:var(--gold-soft); border-color:var(--vien-vang); border-radius:14px; }
.hs-nha .gt-nhac-icon { width:34px; height:34px; border-radius:10px; background:var(--surface); display:grid; place-items:center; font-size:17px; flex:none; }
.hs-nha .gt-nhac-ds a { color:var(--ink); border-color:var(--vien-vang); font-weight:500; }
.hs-nha .hs-new { background:var(--tt-do-nen); color:var(--tt-do); }
/* Danh sách môn */
.hs-nha .gt-tabs { display:inline-flex; gap:2px; background:var(--surface); border:1px solid var(--line); border-radius:12px; padding:4px; }
.hs-nha .gt-tabs a { border:0; background:none; border-radius:9px; }
.hs-nha .gt-tabs a.on { background:var(--accent); color:var(--on-accent); }
.hs-nha .gt-chon-mon select { border-radius:10px; }
.hs-nha .gt-mon { border-left-width:1px; border-color:var(--line); }
.hs-nha .gt-mon-dau { background:none; }
.hs-nha .gt-mon-ic { border-radius:12px; background:color-mix(in srgb, var(--mau) 11%, var(--surface)); }
.hs-nha .gt-mon-dau h3 { font-family:var(--f-display); }
.hs-nha .gt-thanh div { background:var(--accent-soft); height:6px; }
.hs-nha .gt-thanh div i { background:var(--tt-xong); }
.hs-nha .gt-mon.xong .gt-mon-dau { background:var(--surface-2); }
.hs-nha .gt-bai h4 { font-weight:600; }
.hs-nha .gt-diem b { font-family:var(--f-display); font-weight:600; font-size:23px; color:var(--tt-xong); }
.hs-nha .gt-diem b.gt-diem-do { color:var(--tt-do); } .hs-nha .gt-diem b.gt-diem-dat { color:var(--tt-chua); }
.hs-nha .gt-bai:target { box-shadow:inset 3px 0 0 var(--gold-bright); background:var(--gold-soft); }
.hs-nha .gt-xh li.em, .hs-nha .gt-bv li.em { background:var(--accent-soft); outline:0; }
.hs-nha .hs-avatar { background:var(--accent-soft); color:var(--accent); }
.hs-nha .gt-phai h3 { font-family:var(--f-display); font-size:16px; }
.hs-nha .gt-bv li b { font-family:var(--f-display); font-weight:600; font-size:16px; }
.hs-nha .gt-phai .hs-online-ds li { background:none; border-color:transparent; }
.hs-nha .gt-phai .hs-online-ds li.cung { background:var(--ok-soft); }
.hs-nha .gt-meo { background:var(--surface); border-color:var(--line); }
.hs-nha .gt-ky { font-family:var(--f-display); font-style:italic; font-weight:500; color:var(--gold-bright); font-size:14px; }
.hs-nha .rcard .top { background:var(--accent); }
/* Nhãn nhóm "Cần làm / Đang làm / Đã hoàn thành" (W-46/47) */
.gt-nhom { display:flex; align-items:center; gap:10px; margin:6px 0 -4px; font-size:12px; font-weight:700; letter-spacing:.1em; text-transform:uppercase; color:var(--muted); }
.gt-nhom::after { content:""; flex:1; height:1px; background:var(--line); }
.gt-nhom i { width:8px; height:8px; border-radius:50%; flex:none; }
/* Thanh tab dưới đáy trên điện thoại (học sinh) */
.hs-tabbar { display:none; }
@media (max-width:760px) {
  .hs-nha .hs-tabbar { display:flex; position:fixed; left:0; right:0; bottom:0; z-index:40; background:var(--surface); border-top:1px solid var(--line);
    justify-content:space-around; padding:6px 4px calc(8px + env(safe-area-inset-bottom, 0px)); box-shadow:0 -4px 16px rgba(30,43,51,.06); }
  .hs-tabbar a, .hs-tabbar button { flex:1; display:grid; justify-items:center; gap:1px; text-decoration:none; color:var(--muted); font:500 11.5px var(--f-body); background:none; border:0; padding:4px 2px; cursor:pointer; }
  .hs-tabbar b { font-size:19px; line-height:1.2; }
  .hs-tabbar a.on { color:var(--accent); font-weight:700; }
  .hs-tabbar form { flex:1; display:flex; margin:0; }
  body.hs-nha.co-tabbar { padding-bottom:72px; }
  .hs-nha.co-tabbar .band:not(.band-quanly) .nav, .hs-nha.co-tabbar .band:not(.band-quanly) .who .vt,
  .hs-nha.co-tabbar .band:not(.band-quanly) .who a, .hs-nha.co-tabbar .band:not(.band-quanly) .who form { display:none; }
  .hs-nha.co-tabbar .band:not(.band-quanly) .who { margin-left:auto; font-size:13px; }
  .hs-nha .gt-hero-chinh { padding:20px 18px; }
  .hs-nha .gt-so { gap:12px; flex-wrap:nowrap; } .hs-nha .gt-so div { flex:1 1 0; padding:0; } .hs-nha .gt-so b { font-size:24px; } .hs-nha .gt-so small { font-size:12px; line-height:1.3; display:block; }
}

/* ===== W-48 Quản trị → Gửi phụ huynh ===== */
.ph-loc .field { min-width:140px; }
.ph-nhanh { margin:-6px 0 14px; color:var(--muted); }
.ph-so { display:grid; grid-template-columns:repeat(5, minmax(0,1fr)); gap:10px; margin-bottom:14px; }
.ph-so div { background:var(--surface); border:1px solid var(--line); border-radius:10px; padding:10px 14px; }
.ph-so b { display:block; font-size:24px; line-height:1.1; font-variant-numeric:tabular-nums; }
.ph-so span { font-size:13px; color:var(--muted); }
.ph-so .do b { color:var(--bad); } .ph-so .cam b { color:var(--tt-do); } .ph-so .xanh b { color:var(--ok); }
.ph-hai { display:grid; grid-template-columns:minmax(0,1fr) minmax(0,1fr); gap:12px; margin-bottom:16px; align-items:start; }
.ph-mau { padding:12px 16px; }
.ph-mau summary { cursor:pointer; }
.ph-mau textarea { width:100%; margin:10px 0 6px; font-size:14px; line-height:1.5; }
.ph-mau code { font-size:12px; background:var(--surface-2); border:1px solid var(--line); border-radius:5px; padding:0 4px; margin-right:3px; cursor:help; }
.ph-goiy { align-self:center; }
.ph-ds { display:grid; gap:6px; }
.ph-dong { display:grid; grid-template-columns:minmax(180px,1.4fr) minmax(150px,1.1fr) 80px 70px 90px minmax(150px,1fr) 190px; gap:10px; align-items:center; }
.ph-dau { font-size:12px; font-weight:700; letter-spacing:.06em; text-transform:uppercase; color:var(--muted); padding:0 14px; }
.ph-dong .c { text-align:center; }
.ph-dong > span { min-width:0; }
.ph-dong small { display:block; font-size:12.5px; color:var(--muted); overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.ph-hs { background:var(--surface); border:1px solid var(--line); border-radius:10px; scroll-margin-top:80px; }
.ph-hs > summary { list-style:none; cursor:pointer; padding:10px 14px; }
.ph-hs > summary::-webkit-details-marker { display:none; }
.ph-hs[open] { box-shadow:0 0 0 2px var(--accent-soft); }
.ph-hs[open] > summary { border-bottom:1px solid var(--line); }
.ph-mo { display:flex; flex-direction:column; align-items:flex-end; gap:4px; }
.ph-nut-mo { font-size:13px; font-weight:600; color:var(--accent); }
.ph-hs[open] .ph-nut-mo::after { content:" (đang mở)"; font-weight:400; color:var(--muted); }
.ph-thieu { color:var(--tt-do) !important; }
.tt.ph-do { background:var(--bad-soft); color:var(--bad); }
.ph-ct { display:grid; grid-template-columns:minmax(0,1.3fr) minmax(0,1fr); gap:18px; padding:14px; }
.ph-tin textarea { width:100%; font-size:14px; line-height:1.5; margin:4px 0 8px; }
.ph-gui { display:flex; gap:6px; align-items:center; margin:0; }
.ph-gui select { min-height:34px; padding:4px 8px; font-size:14px; width:auto; }
.ph-ben h4 { margin:0 0 6px; font-size:14px; }
.ph-bai { list-style:none; margin:0 0 14px; padding:0; display:grid; gap:4px; font-size:13.5px; }
.ph-bai li { display:grid; grid-template-columns:auto minmax(0,1fr) auto; gap:8px; align-items:center; }
.ph-bai .tt { font-size:11px; }
.ph-lh { display:grid; gap:6px; margin:0; }
.ph-lh .btn { justify-self:start; }
@media (max-width:1000px) {
  .ph-so { grid-template-columns:repeat(3, minmax(0,1fr)); }
  .ph-hai, .ph-ct { grid-template-columns:1fr; }
  .ph-dau { display:none; }
  .ph-dong { grid-template-columns:1fr 1fr; row-gap:6px; }
  .ph-dong .c { text-align:left; }
  .ph-mo { grid-column:1 / -1; flex-direction:row; justify-content:space-between; align-items:center; }
}

/* ===== W-51 Chữ đồng bộ toàn web (thầy yêu cầu 06/11/2026) =====
   Một họ chữ Be Vietnam Pro (thiết kế cho tiếng Việt) cho mọi trang: học sinh, giáo viên, quản trị, đăng nhập, xem đề cương.
   Thang chữ: tiêu đề 700, nhãn/nút 600, nội dung 400–500; số liệu dùng chữ số đều cột. */
:root { --f-display: var(--f-body); --f-mono: var(--f-body); }
body { -webkit-font-smoothing:antialiased; -moz-osx-font-smoothing:grayscale; text-rendering:optimizeLegibility; font-kerning:normal; }
h1, h2, h3, h4 { font-family:var(--f-body); letter-spacing:-.01em; }
h1, h2, h3 { font-weight:700; }
h4 { font-weight:600; }
.btn, .pill, .tt, .eyebrow, .gt-eyebrow, .gt-tabs a, .tabs a, .nav a, label, th { font-family:var(--f-body); }
.num, .stat b, .score b, .gt-so b, .gt-diem b, .gt-vong b, .gt-bv li b, .gt-xh li b, .ph-so b, .clock, .cell b, td.c, .nav-dem { font-variant-numeric:tabular-nums; }
.hs-nha .gt-so b, .hs-nha .gt-diem b, .hs-nha .gt-vong b, .hs-nha .gt-bv li b { font-weight:700; letter-spacing:-.01em; }
.hs-nha .gt-ky { font-style:italic; font-weight:500; }

/* ===== W-56 "Ngôi sao chăm chỉ" (phương án A thầy duyệt 09/11/2026) – khích lệ, không phân loại trên giao diện học sinh ===== */
.nsc { position:relative; overflow:hidden; margin:0 0 18px; padding:20px 22px 16px; border-radius:18px; background:linear-gradient(180deg, #FFFDF7, var(--surface)); border:1px solid var(--line); }
.nsc::before { content:""; position:absolute; right:-80px; top:-80px; width:280px; height:280px; border-radius:50%; background:radial-gradient(circle, #FBEFD2 0%, transparent 70%); pointer-events:none; }
.nsc > * { position:relative; }
.nsc-dau { display:flex; justify-content:space-between; align-items:flex-end; gap:8px 16px; flex-wrap:wrap; }
.nsc-nho { display:block; font-size:12.5px; font-weight:600; letter-spacing:.12em; text-transform:uppercase; color:var(--gold-bright, #B88A2E); }
.nsc h2 { margin:2px 0 0; font-size:24px; }
.nsc-dau p { margin:4px 0 0; color:var(--muted); font-size:14px; max-width:62ch; }
.nsc-gio { font-size:12.5px; color:var(--muted); background:var(--surface-2); border:1px solid var(--line); border-radius:999px; padding:4px 12px; white-space:nowrap; }
.nsc-luoi { display:grid; grid-template-columns:minmax(0,1.25fr) minmax(0,1fr); gap:16px; margin-top:16px; }
.nsc-luoi.mot-cot { grid-template-columns:minmax(0,1fr); }
.nsc h3 { margin:0 0 10px; font-size:15px; }
.nsc-rong { margin:0; color:var(--muted); font-size:14px; }
.nsc-sao-ds { list-style:none; margin:0; padding:0; display:grid; grid-template-columns:repeat(3, minmax(0,1fr)); gap:10px; }
.nsc-sao-ds li { text-align:center; padding:14px 8px 12px; border-radius:16px; background:#F6EDD9; border:1px solid #EAD9B3; min-width:0; }
.nsc-sao-ds li.la-em { box-shadow:0 0 0 2px #F2D27A; }
.nsc-av { width:54px; height:54px; margin:0 auto 6px; border-radius:50%; display:grid; place-items:center; font-weight:700; font-size:17px; color:#7A5A16; background:#fff; box-shadow:0 0 0 3px #F2D27A; position:relative; }
.nsc-av::after { content:"⭐"; position:absolute; right:-6px; top:-8px; font-size:18px; }
.nsc-sao-ds b { display:block; font-size:14.5px; line-height:1.3; color:#1E2B33; overflow-wrap:anywhere; }
.nsc-sao-ds small { display:block; color:#646E73; font-size:12px; }
.nsc-nl { margin-top:6px; display:inline-block; font-size:12.5px; font-weight:600; color:#7A5A16; background:#fff; border-radius:999px; padding:2px 10px; font-variant-numeric:tabular-nums; }
.nsc-chuc { margin:10px 0 0; font-size:14px; color:#7A5A16; }
.nsc-em { background:var(--accent-soft); border-radius:16px; padding:14px 16px; }
.nsc-em-dong { display:flex; align-items:center; gap:12px; flex-wrap:wrap; }
.nsc-sao { font-size:22px; letter-spacing:2px; line-height:1; color:#C9CDD0; }
.nsc-sao i { font-style:normal; }
.nsc-sao i.sang { color:#E8B931; text-shadow:0 1px 0 rgba(122,90,22,.25); }
.nsc-sao small { font-size:12px; color:var(--muted); letter-spacing:0; margin-left:4px; }
.nsc-em-dong b { font-variant-numeric:tabular-nums; }
.nsc-em p { margin:8px 0 0; font-size:14px; }
.nsc-thanh { margin-top:10px; height:10px; background:var(--surface); border-radius:99px; overflow:hidden; }
.nsc-thanh i { display:block; height:100%; background:linear-gradient(90deg, #4E8A6A, #7CB592); border-radius:99px; }
.nsc-thanh-ghi { display:flex; justify-content:space-between; gap:8px; font-size:12px; color:var(--muted); margin-top:4px; flex-wrap:wrap; }
.nsc-form { margin:0; }
.nsc-nut { margin-top:12px; border-radius:12px; white-space:normal; text-align:left; }
.nsc-khoi { margin-top:16px; display:flex; align-items:center; gap:14px; padding:12px 16px; border-radius:14px; background:var(--ok-soft); flex-wrap:wrap; }
.nsc-khoi-so { font-size:26px; font-weight:700; color:var(--ok); line-height:1; font-variant-numeric:tabular-nums; }
.nsc-khoi p { margin:0; font-size:14px; flex:1 1 280px; }
.nsc-khoi-thanh { flex:1 1 160px; height:8px; background:var(--surface); border-radius:99px; overflow:hidden; }
.nsc-khoi-thanh i { display:block; height:100%; background:var(--ok); border-radius:99px; }
.bvk-moi { animation:nsc-sang 1.2s ease-out; }
@keyframes nsc-sang { from { box-shadow:0 0 0 4px rgba(242,210,122,.6), 0 0 34px rgba(242,210,122,.35); } }
@media (prefers-reduced-motion: reduce) { .bvk-moi { animation:none; } }
@media (prefers-color-scheme: dark) { .nsc { background:var(--surface); } .nsc::before { opacity:.15; } }
@media (max-width:760px) {
  .nsc { padding:16px 14px 14px; }
  .nsc h2 { font-size:20px; }
  .nsc-luoi { grid-template-columns:minmax(0,1fr); }
  .nsc-sao-ds { gap:6px; } .nsc-sao-ds li { padding:10px 4px; }
  .nsc-av { width:44px; height:44px; font-size:14px; } .nsc-sao-ds b { font-size:13px; }
  .nsc-nl { font-size:11.5px; padding:2px 6px; }
}/* W-54 Quản trị → Bảng vàng các khối */
.bvq { margin-bottom:16px; }
.bvq-dau { display:flex; align-items:baseline; justify-content:space-between; gap:10px; flex-wrap:wrap; margin-bottom:10px; }
.bvq-top td { background:var(--gold-soft); }
/* W-57 Căn cứ khen thưởng: cột khen */
.bvq-khen { min-width:220px; }
.bvq-da { display:flex; align-items:center; gap:4px; margin:0 0 4px; }
.bvq-da .linkbtn { text-decoration:none; font-size:16px; color:var(--muted); }
.bvq-form { display:flex; gap:6px; align-items:center; margin:0; }
.bvq-form .input { min-height:34px; padding:4px 8px; font-size:13px; width:150px; }