/* Man Dang ky du thi (FE-25). Chi dung bien trong tokens.css. */
[hidden] { display: none !important; }

.page-hero--contest { padding: 88px 0 184px; }
.page-hero--contest .container { display: flex; flex-direction: column; align-items: flex-start; gap: 18px; }
.page-hero--contest h1 { margin-top: 0; max-width: 640px; }
.page-hero--contest .crumb { font-size: var(--fs-small); color: var(--c-on-brand-muted); }
.page-hero--contest .crumb a { color: var(--c-on-brand-muted); }
.page-hero--contest p { margin-top: 0; }

.contest { position: relative; z-index: 2; margin-top: -120px; padding-bottom: 104px; }
.contest__row { display: flex; flex-wrap: wrap; gap: 20px; align-items: flex-start; }
.contest__main {
  flex: 3 1 600px; min-width: 0; padding: 36px; scroll-margin-top: 24px;
  background: var(--c-bg); border: 1px solid var(--c-border); border-radius: var(--radius); box-shadow: var(--shadow-float);
}
.contest__side { flex: 1 1 280px; min-width: 0; display: flex; flex-direction: column; gap: 20px; }
.contest__h2 { margin-top: 10px; font-size: var(--fs-h2-card); line-height: 1.2; letter-spacing: -.02em; outline: none; }
.contest__block { margin-top: 24px; }
.contest__actions { margin-top: 18px; }

.infogrid { margin-top: 22px; display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 180px), 1fr)); gap: 12px; }
.infocell { background: var(--c-bg-soft); border-radius: var(--radius); padding: 16px 18px; font-size: 0.9375rem; }
.infocell b { display: block; font-size: 0.78125rem; letter-spacing: .1em; text-transform: uppercase; color: var(--c-brand-600); }
.infocell__link { display: inline-block; margin-top: 6px; font-weight: 700; }

.modes { margin: 24px 0 0; padding: 0; border: 0; min-width: 0; }
.modes legend { padding: 0; margin-bottom: 10px; font-weight: 700; }
.modes__grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr)); gap: 12px; }
.mode {
  display: flex; gap: 12px; align-items: flex-start; cursor: pointer;
  padding: 16px 18px; background: var(--c-bg); border: 1px solid var(--c-border); border-radius: var(--radius);
}
.mode input { width: 20px; height: 20px; margin: 2px 0 0; flex-shrink: 0; accent-color: var(--c-brand); }
.mode b { display: block; font-size: 1.03125rem; }
.mode span span { font-size: 0.90625rem; color: var(--c-text-3); }
.mode:has(input:checked) { border: 2px solid var(--c-brand); background: var(--c-tint); padding: 15px 17px; }
.mode:has(input:focus-visible) { outline: 2px solid var(--c-accent); outline-offset: 2px; }

.rgform { margin-top: 24px; display: flex; flex-direction: column; gap: 18px; }
.fieldgrid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 220px), 1fr)); gap: 14px; }
.fieldgrid label { display: flex; flex-direction: column; gap: 6px; font-weight: 700; font-size: 0.9375rem; }
.fieldgrid .optional { font-weight: 400; color: var(--c-text-4); }
.field[aria-invalid="true"] { border-color: var(--c-danger-600); }

.pinkbox { background: var(--c-tint); border: 1px solid var(--c-tint-border); border-radius: var(--radius); padding: 16px 20px; font-size: 0.9375rem; }
.pinkbox b { display: block; margin-bottom: 6px; color: var(--c-brand); }
.pinkbox ul { margin: 0; padding-left: 20px; display: flex; flex-direction: column; gap: 4px; }

.notebox { border: 1px solid var(--c-border); border-radius: var(--radius); padding: 18px 20px; font-size: 0.9375rem; }
.notebox > b { display: block; margin-bottom: 8px; }
.notebox ul { margin: 0; padding-left: 20px; display: flex; flex-direction: column; gap: 8px; color: var(--c-text-2); }
.notebox li b { color: var(--c-text); }

.consent {
  display: flex; gap: 12px; align-items: flex-start; cursor: pointer;
  background: var(--c-tint); border: 1px solid var(--c-tint-border); border-radius: var(--radius-sm); padding: 14px 16px; font-size: 0.96875rem;
}
.consent input { width: 20px; height: 20px; margin: 3px 0 0; flex-shrink: 0; accent-color: var(--c-brand); }

.contest__block p { margin: 6px 0 0; }
.formerr { display: flex; gap: 10px; align-items: flex-start; color: var(--c-danger-600); font-weight: 600; font-size: 0.9375rem; }

.practice {
  margin-top: 16px; display: flex; align-items: center; gap: 14px; text-decoration: none;
  font-weight: 700; color: var(--c-brand); background: var(--c-bg-soft); border: 1px solid var(--c-bg-soft);
  border-radius: var(--radius); padding: 16px 20px;
}
.practice span:first-child { flex: 1; }
.practice span:last-child { font-size: 1.25rem; }
.practice:hover { border-color: var(--c-brand); color: var(--c-brand); }

.sidecard { background: var(--c-bg); border: 1px solid var(--c-border); border-radius: var(--radius); box-shadow: var(--shadow-float); padding: 20px 22px; }
.sidecard__text { margin-top: 10px; color: var(--c-text-3); }
.sidewarn {
  display: flex; gap: 10px; align-items: flex-start; font-size: 0.9375rem; color: var(--c-text-2);
  background: var(--c-tint); border: 1px solid var(--c-tint-border); border-radius: var(--radius); padding: 16px 18px;
}
.sidewarn svg { flex-shrink: 0; margin-top: 4px; color: var(--c-danger-600); }
.sidewarn a { font-weight: 700; }

/* Danh sach chuyen de, gioi thieu chuyen de, cot ben (FE-26) */
.exam__sub { margin: 0; color: var(--c-text-3); }
.exam__sub b { color: var(--c-text); }
.exam__note { margin: 20px 0 0; font-size: 0.84375rem; color: var(--c-text-4); }
.exam__loading { color: var(--c-text-3); }
.exam__actions { margin-top: 26px; display: flex; flex-wrap: wrap; gap: 10px; }
.exam__intro-head { margin-top: 20px; }
.exam__intro { margin-top: 16px; display: flex; flex-direction: column; gap: 10px; font-size: 1.03125rem; }
.exam__intro p { margin: 0; }

.infobox { margin-top: 18px; border: 1px solid var(--c-border); border-radius: var(--radius); padding: 14px 18px; font-size: 0.9375rem; }
.infobox > b { display: block; }
.infobox--ok { background: var(--c-ok-bg); border-color: var(--c-ok-border); }
.infobox--ok > b, .infobox--soft > b { display: inline; }
.infobox--soft { background: var(--c-bg-soft); }
.infobox--warn { background: var(--c-tint); border-color: var(--c-tint-border); }

.toplist { margin: 22px 0 0; padding: 0; list-style: none; display: flex; flex-direction: column; gap: 10px; }
.toplist .qrow { text-decoration: none; }
.toplist .qrow__n { width: 40px; height: 40px; }
.qrow__t { display: block; font-weight: 700; font-size: 1.03125rem; }
.qrow__go { font-weight: 700; font-size: 1.25rem; color: var(--c-brand-600); }
.qrow--done .qrow__n { background: var(--c-ok); color: #fff; }
.qrow--lock { color: var(--c-text-4); background: var(--c-lock-bg); cursor: default; }
.qrow--lock:hover { border-color: var(--c-border); transform: none; }
.qrow--lock .qrow__n { background: var(--c-lock-n); color: var(--c-lock-text); }
.qrow__lock { flex-shrink: 0; }

.qnav--s { height: 40px; padding: 0 14px; font-size: 0.875rem; gap: 6px; }
.qnav--block { width: 100%; margin-top: 14px; }
.exam__intro-head .qeyebrow { margin-top: 0; }

.peek { margin-top: 22px; border: 1px solid var(--c-border); border-radius: var(--radius); padding: 0 18px; }
.peek summary { padding: 14px 0; display: flex; justify-content: space-between; align-items: center; gap: 12px; cursor: pointer; list-style: none; }
.peek summary::-webkit-details-marker { display: none; }
.peek summary:focus-visible { outline: 2px solid var(--c-accent); outline-offset: 2px; }
.peek summary b { display: block; }
.peek__n { font-size: 0.84375rem; color: var(--c-text-4); }
.peek__pk { font-size: 1.5rem; line-height: 1; color: var(--c-brand-600); }
.peek__pk::before { content: "+"; }
.peek[open] .peek__pk::before { content: "×"; }
.peek dl { margin: 0; padding: 0 0 16px; display: flex; flex-direction: column; gap: 12px; font-size: 0.9375rem; }
.peek dt { font-weight: 700; }
.peek dd { margin: 2px 0 0; color: var(--c-text-3); }

.contest__sidecards { display: flex; flex-direction: column; gap: 20px; }
.sidecard__label { margin: 12px 0 0; font-size: 0.84375rem; color: var(--c-text-4); }
.sidecard__code { display: block; font-size: 1.625rem; line-height: 1.25; letter-spacing: .02em; color: var(--c-brand); font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.sidecard__code--anon { letter-spacing: .06em; }
.sidecard__name { margin: 2px 0 0; font-size: 0.9375rem; }
.sidecard__meta { margin: 8px 0 0; font-size: 0.875rem; color: var(--c-text-3); }
.sidecard__tag { display: inline-flex; margin-top: 8px; background: var(--c-bg-soft-2); color: var(--c-text-3); font-size: 0.78125rem; font-weight: 700; padding: 3px 10px; border-radius: var(--radius-sm); }
.sidecard__text--tight { margin: 8px 0 12px; }
.sidecard .qbar { margin: 0; }
.sidelist { margin: 14px 0 0; padding: 0; list-style: none; }
.sidelist li { display: flex; align-items: center; gap: 10px; padding: 7px 0; border-top: 1px solid var(--c-bg-soft-2); font-size: 0.875rem; }
.sidelist li.is-on { font-weight: 700; color: var(--c-brand); }
.sidelist li.is-lock { color: var(--c-lock-text); }
.sidelist__n { width: 22px; height: 22px; border-radius: var(--radius-sm); flex-shrink: 0; display: grid; place-items: center; font-size: 0.75rem; font-weight: 800; background: var(--c-bg-soft-2); color: var(--c-text-4); }
.sidelist li.is-on .sidelist__n { background: var(--c-brand); color: #fff; }
.sidelist__n.is-done { background: var(--c-ok); color: #fff; }
.sidelist__t { flex: 1; min-width: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }


/* Man cau hoi (FE-27) */
.qtop { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 10px; }
.qcount { font-weight: 800; font-size: 0.9375rem; color: var(--c-brand); font-variant-numeric: tabular-nums; }
.qstem .qsit { margin: 14px 0 0; }
.qstem .qtitle { margin: 14px 0 20px; }
.qnote { margin: 14px 0 0; font-size: 0.9375rem; font-weight: 600; color: var(--c-danger-600); }
.qactions { margin-top: 24px; display: flex; flex-wrap: wrap; align-items: center; gap: 12px 16px; }
.qwait { margin: 0; font-size: 0.875rem; color: var(--c-text-4); }
.qwait:empty { display: none; }

/* Man Xong chuyen de (FE-27): dong dau cua hop tach rieng dong chu */
.exam__done .infobox > b { display: block; }

@media (max-width: 900px) {
  .contest__main, .contest__side { flex-basis: 100%; }
}
@media (max-width: 640px) {
  .contest__main { padding: 24px; }
  .page-hero--contest { padding: 56px 0 160px; }
}
@media (max-width: 480px) {
  .qactions { flex-direction: column; align-items: stretch; }
  .qactions .qnav { width: 100%; }
  .exam__done .exam__actions .qnav { width: 100%; height: auto; min-height: 48px; padding-top: 10px; padding-bottom: 10px; justify-content: center; text-align: center; }
}

/* Chon cuoc thi (F7): thong tin cuoc dang dang ky va danh sach chon khi co nhieu cuoc */
.cinfo { margin-top: 18px; }
.cinfo__name { margin: 4px 0 0; font-size: var(--fs-h3); line-height: 1.25; }
.cinfo__desc { margin: 6px 0 0; color: var(--c-text-3); }
.cinfo__other { display: inline-block; margin-top: 8px; font-weight: 700; font-size: 0.9375rem; }

.cpick__h { margin: 0; font-size: var(--fs-h3); line-height: 1.25; }
.cpick__intro { margin: 6px 0 0; color: var(--c-text-3); }
.cpick__list { margin: 16px 0 0; padding: 0; list-style: none; display: flex; flex-direction: column; gap: 10px; }
.cpick__card {
  position: relative; display: flex; flex-direction: column; gap: 4px; text-decoration: none; color: var(--c-text);
  padding: 16px 64px 16px 20px; background: var(--c-bg); border: 1px solid var(--c-border); border-radius: var(--radius);
  transition: border-color var(--ease);
}
.cpick__card:hover { border-color: var(--c-brand); }
.cpick__card:focus-visible { outline: 2px solid var(--c-accent); outline-offset: 2px; }
.cpick__name { font-weight: 700; font-size: 1.03125rem; color: var(--c-brand); }
.cpick__desc { font-size: 0.9375rem; color: var(--c-text-2); }
.cpick__meta { font-size: 0.84375rem; color: var(--c-text-4); }
.cpick__go { position: absolute; top: 50%; right: 20px; transform: translateY(-50%); font-weight: 700; color: var(--c-brand-600); }
.cpick__up { margin-top: 16px; }
#pickbox > .notebox + .cpick__h { margin-top: 20px; }
#pickbox > p { margin: 16px 0 0; }

/* Nop bai, hop thoai, man ket qua (F9 / FE-29) */
.submitbar { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px 20px; }
.submitbar p { margin: 0; flex: 1 1 260px; }

.restable { margin-top: 22px; width: 100%; border-collapse: collapse; font-size: 0.9375rem; }
.restable th, .restable td { padding: 12px 14px; border-top: 1px solid var(--c-border); text-align: left; vertical-align: middle; }
.restable thead th { border-top: 0; font-size: 0.78125rem; letter-spacing: .1em; text-transform: uppercase; color: var(--c-brand-600); }
.restable tbody th { font-weight: 700; }
.restable td { white-space: nowrap; text-align: right; font-variant-numeric: tabular-nums; font-weight: 700; }
.restable thead th:last-child { text-align: right; }
.restable__n { display: inline-grid; place-items: center; width: 26px; height: 26px; margin-right: 10px; border-radius: var(--radius-sm); background: var(--c-bg-soft-2); color: var(--c-text-3); font-size: 0.8125rem; font-weight: 800; }

.sdlg { width: min(560px, calc(100% - 32px)); max-height: calc(100dvh - 32px); padding: 0; border: 1px solid var(--c-border); border-radius: var(--radius); background: var(--c-bg); color: var(--c-text); overflow: auto; }
.sdlg::backdrop { background: rgba(0, 0, 0, .5); }
.sdlg__form { padding: 28px; display: flex; flex-direction: column; gap: 16px; }
.sdlg__h { margin: 0; font-size: var(--fs-h3); line-height: 1.25; outline: none; }
.sdlg__sum { margin: 0; }
.sdlg__anon, .sdlg__legal { margin: 0; font-size: 0.9375rem; color: var(--c-text-3); }
.sdlg__fields { display: flex; flex-direction: column; gap: 14px; }
.sdlg__actions { display: flex; flex-wrap: wrap; gap: 10px; }
@media (max-width: 480px) {
  .sdlg { width: 100%; max-width: none; max-height: 100dvh; height: 100dvh; margin: 0; border-radius: 0; border: 0; }
  .sdlg__form { padding: 20px 16px 28px; }
  .sdlg__actions { flex-direction: column; }
  .sdlg__actions .qnav { width: 100%; justify-content: center; }
  .submitbar .qnav { width: 100%; justify-content: center; }
}

/* Shared fixed header used by the integrated contest flow. */
.contest-site .page-hero--contest { padding-top: 144px; }
.contest-site .contest__main { scroll-margin-top: 100px; }