/* Exam surfaces share the workbench palette and use document scrolling at every size. */
.exam-page { --accent: var(--ok); --text-soft: var(--text-mid); --brand-strong: var(--brand-deep); --bg-elev: var(--panel); --bg-sunken: var(--bg-sink); background: var(--bg-soft); font-size: 14px; }
.exam-page .app { min-height: 100dvh; }
/* One viewport layer covers the header, materials, questions and results while scrolling.
   Dialogs render in the browser top layer, so repeat the same overlay inside image viewing. */
.student-content-locked .exam-page::after,
.student-content-locked .student-image-viewer::after {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: url('/assets/logo-zgt-watermark.svg') 0 0 / 248px 192px round;
  opacity: .1;
  pointer-events: none;
  user-select: none;
}
.student-content-locked .qcard .wmk-layer { display: none; }
@media (max-width: 760px) {
  .student-content-locked .exam-page::after,
  .student-content-locked .student-image-viewer::after {
    background-size: 50% 156px;
  }
}
.student-content-locked, .student-content-locked * {
  -webkit-user-select: none !important;
  user-select: none !important;
  -webkit-touch-callout: none !important;
  -webkit-user-drag: none;
}
.student-image-viewer { width: min(1120px, calc(100vw - 32px)); max-width: calc(100vw - 32px); max-height: calc(100dvh - 32px); padding: 0 16px 16px; border: 1px solid var(--border); border-radius: 12px; background: var(--panel); color: var(--text); overflow: auto; }
.student-image-viewer::backdrop { background: rgba(20,26,40,.6); }
.student-image-viewer > header { position: sticky; top: 0; display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 12px 0; background: var(--panel); }
.student-image-viewer > img { display: block; max-width: 100%; height: auto; margin: 0 auto; }
.exam-page .topbar { display: flex; align-items: center; flex-wrap: wrap; gap: 16px; padding: 0 max(24px, calc((100vw - 1344px) / 2)); border-bottom: 1px solid var(--border); background: var(--panel); }
.exam-page .topbar > .brand { padding: 18px 0; }
.exam-page .topbar > .brand small { display: block; color: var(--text-mid); font-size: 11px; font-weight: 400; }
.exam-page .topnav { display: flex; gap: 4px; flex-wrap: wrap; }
.exam-page .topnav a { padding: 8px 10px; border-radius: 7px; color: var(--text-mid); }
.exam-page .topnav a:hover, .exam-page .topnav a.active { background: var(--brand-soft); color: var(--brand-deep); }
.exam-page .kpis { display: flex; flex-wrap: wrap; gap: 6px; }
.exam-page .main { display: block; overflow: visible; }
.exam-page .exam-shell { width: min(100%, 1344px); margin: 0 auto; padding: 28px 24px 48px; }
.exam-page :is(.panel,.exam-content,.qside,.qcard,.exam-workspace,.exam-sidebar) { min-width: 0; }
.exam-page .panel { padding: 26px; margin-bottom: 20px; border: 1px solid var(--border); border-radius: 14px; background: var(--panel); }
.exam-page .panel h2 { margin: 0 0 18px; font-size: 18px; line-height: 1.5; }
.exam-page :is(h1,h2,h3,p) { overflow-wrap: anywhere; }
.exam-page .hero { margin: 6px 0 24px; }
.exam-page .hero h1 { font-size: 26px; margin: 0 0 8px; }
.exam-page .hero p { margin: 0; color: var(--text-mid); }
.exam-page .formgrid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 16px; }
.exam-page .field { min-width: 0; }
.exam-page .field label { display: block; margin-bottom: 7px; color: var(--text-mid); }
.exam-page .field :is(input,select) { width: 100%; min-height: 44px; padding: 9px 12px; border: 1px solid var(--border-strong); border-radius: 8px; background: var(--panel); }
.exam-page .joinactions { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-top: 18px; }
.exam-page .btn { min-height: 38px; display: inline-flex; justify-content: center; align-items: center; text-align: center; }
.exam-page .btn.sm { min-height: 32px; }
.exam-page :is(button,a,input,select,summary):focus-visible { outline: 3px solid var(--brand); outline-offset: 3px; }
.exam-page button:disabled { cursor: not-allowed; opacity: .5; }
.exam-page .tag { display: inline-flex; align-items: center; width: auto; max-width: 100%; padding: 3px 8px; font-size: 11px; line-height: 1.6; white-space: normal; overflow-wrap: anywhere; }
.exam-page .tag.ok { background: #eaf7ef; color: #16743e; }
.exam-page .tag.warn { background: var(--warn-soft); color: #8f5711; }
.exam-page .tag.brand { color: var(--brand-deep); background: var(--brand-soft); }
.exam-page .exam-head { position: sticky; top: 0; z-index: 20; display: flex; gap: 14px; align-items: center; padding: 18px 22px; margin-bottom: 22px; border: 1px solid var(--border); border-radius: 12px; background: var(--panel); box-shadow: 0 2px 8px rgba(20,26,40,.03); }
.exam-page #examTitle { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; font-size: 17px !important; }
.exam-page .timer { font-size: 26px; font-weight: 700; line-height: 1.2; letter-spacing: .5px; font-variant-numeric: tabular-nums; }
.exam-page .timer.low { color: var(--danger); }
.exam-page .progress-track { width: min(180px, 25vw); height: 5px; overflow: hidden; border-radius: 10px; background: var(--bg-sink); }
.exam-page .progress-track i { display: block; height: 100%; background: var(--brand); }
.exam-page .exam-workspace { display: grid; grid-template-columns: 216px minmax(0,1fr); gap: 24px; align-items: start; }
.exam-page .exam-sidebar { position: sticky; top: 122px; }
.exam-page .question-navigator { padding: 18px 14px; border: 1px solid var(--border); border-radius: 12px; background: var(--panel); }
.exam-page .question-navigator > summary { cursor: pointer; font-size: 15px; }
.exam-page #navProgress { margin-left: 8px; font-size: 11px; color: var(--text-mid); font-weight: 400; }
.exam-page .nav-legend { display: flex; flex-wrap: wrap; gap: 6px; margin: 14px 0; font-size: 10px; }
.exam-page .nav-legend span { padding: 2px 5px; border: 1px solid var(--border-strong); border-radius: 4px; }
.exam-page .nav-legend span:first-child { color: white; background: var(--brand); border-color: var(--brand); }
.exam-page .nav-legend span:nth-child(2) { color: var(--brand-deep); background: var(--brand-soft); border-color: #d4d4f6; }
.exam-page .qnav { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 8px; max-height: calc(100dvh - 320px); overflow-y: auto; padding: 3px; }
.exam-page .qnav button { min-height: 38px; padding: 5px 0; border: 1px solid var(--border-strong); border-radius: 7px; cursor: pointer; background: var(--panel); font-size: 13px; font-variant-numeric: tabular-nums; }
.exam-page .qnav button.done { background: var(--brand-soft); color: var(--brand-deep); border-color: #d4d4f6; font-weight: 650; }
.exam-page .qnav button.on { background: var(--brand); border-color: var(--brand); color: #fff; }
.exam-page .question-navigator .hint { margin: 14px 2px 0; font-size: 11px; color: var(--text-mid); }
.exam-page .timingbar, .exam-page .modnav { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 16px; }
.exam-page .tb-item { padding: 6px 10px; border-radius: 6px; background: var(--bg-sink); color: var(--text-mid); font-size: 12px; }
.exam-page .tb-item.on { background: var(--brand-soft); color: var(--brand-deep); }
.exam-page .tb-item.bad { color: var(--danger); }
.exam-page .modchip { padding: 8px 12px; border: 1px solid var(--border-strong); border-radius: 8px; background: var(--panel); cursor: pointer; }
.exam-page .modchip.on { border-color: var(--brand); color: var(--brand-deep); }
.exam-page #examBody { padding-bottom: 24px; }
.exam-page .exam-q.single { width: 100%; max-width: none; padding: 0; align-items: stretch; }
.exam-page .exam-section { margin: 0 0 16px; width: 100%; max-width: none !important; }
.exam-page .qsplit { width: 100%; }
.exam-page .qsplit.with-material { grid-template-columns: minmax(0,.95fr) minmax(0,1.05fr); gap: 18px; }
.exam-page .qsplit .qside { display: block; }
.exam-page .qsplit .qside .qcard { margin: 0; }
.exam-page .qsplit.with-material .mpanel { position: sticky; top: 126px; max-height: calc(100dvh - 154px); max-width: none; overflow-y: auto; }
.exam-page .qcard { max-width: none; padding: 26px; margin: 0; border-radius: 12px; box-shadow: none; background: var(--panel); }
.exam-page .qhead { display: flex; gap: 6px; flex-wrap: wrap; align-items: center; margin-bottom: 18px; }
.exam-page .qcard .stem { font-size: 16px; line-height: 1.9; overflow-wrap: anywhere; }
.exam-page .stem p { margin: 0 0 12px; }
.exam-page :is(.stem,.exp) pre { max-width: 100%; overflow-x: auto; white-space: pre; padding: 14px 16px; background: var(--bg-sink); border: 1px solid var(--border); border-radius: 8px; font: 13px/1.8 Consolas,monospace; }
.exam-page :is(.stem,.exp) code { font-family: Consolas,monospace; }
.exam-page .opts-vertical { gap: 12px; margin-top: 22px; }
.exam-page .opts-vertical .optrow { min-height: 52px; padding: 14px; background: var(--panel); }
.exam-page .opts-vertical .optrow:hover, .exam-page .opts-vertical .optrow.sel { background: var(--brand-soft); border-color: var(--brand); }
.exam-page .optrow { overflow-wrap: anywhere; }
.exam-page .opts-vertical .otext { white-space: pre-wrap; }
.exam-page .qcard .pagebar { display: grid; grid-template-columns: auto minmax(76px,1fr) auto; gap: 10px; margin-top: 26px; padding-top: 18px; }
.exam-page .pagebar .pageno { min-width: 0; font-size: 12px; }
.exam-page #jumpSubmit { grid-column: 1/-1; justify-self: end; color: var(--text-mid); font-size: 12px; }
.exam-page .exam-material { padding: 18px; font-size: 14px; line-height: 1.9; }
.exam-page .exam-material .mh { font-size: 13px; color: var(--text); }
.exam-page .exam-material .mtext { white-space: normal; overflow-wrap: anywhere; }
.exam-page .exam-material .mtextwrap > summary { padding: 8px 0; font-size: 12px; }
.exam-page .lockbar { padding: 12px; color: var(--danger); background: var(--warn-soft); border-radius: 8px; margin-bottom: 12px; }
.exam-page .result-overview { padding: 30px; }
.exam-page .result-heading { display: flex; gap: 28px; align-items: center; margin-bottom: 26px; }
.exam-page .score-hero { min-width: 130px; padding-right: 26px; border-right: 1px solid var(--border); }
.exam-page .score-hero .num { font-size: 54px; font-weight: 750; line-height: 1.1; white-space: nowrap; font-variant-numeric: tabular-nums; }
.exam-page .score-hero .score-label { margin-top: 8px; color: var(--text-mid); font-size: 12px; }
.exam-page .result-summary { min-width: 0; }
.exam-page .result-summary h1 { font-size: 22px; line-height: 1.5; margin: 5px 0 9px; }
.exam-page .result-summary .lbl { font-size: 13px; color: var(--text-mid); line-height: 1.9; }
.exam-page .result-summary .eyebrow { margin: 0; font-size: 12px; color: var(--brand-deep); font-weight: 650; }
.exam-page .statgrid { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 18px; padding: 22px 0; margin-bottom: 10px; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.exam-page .stat { display: flex; flex-direction: column; gap: 4px; }
.exam-page .stat b { font-size: 26px; line-height: 1.4; font-variant-numeric: tabular-nums; }
.exam-page .stat span { color: var(--text-mid); font-size: 12px; }
.exam-page .timesum { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 14px; justify-content: flex-start; }
.exam-page .tslow { width: 100%; color: var(--text-mid); font-size: 12px; }
.exam-page .result-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.exam-page .result-insights { display: grid; grid-template-columns: minmax(0,1.2fr) minmax(0,1fr); gap: 20px; margin-bottom: 20px; }
.exam-page .result-insights > .panel { margin: 0; }
.exam-page .result-insights .statgrid2.one { grid-template-columns: minmax(0,1fr); }
.exam-page .result-insights .statcard { border: 0; padding: 0; background: transparent; }
.exam-page .result-insights .donut { width: 156px; height: 156px; }
.exam-page .result-insights .weaktext { font-size: 14px; line-height: 1.9; }
.exam-page .result-insights .dlegend { max-width: 320px; margin-top: 8px; }
.exam-page .result-insights .statcard-t { margin-top: 8px; color: var(--text-mid); }
.exam-page .result-review { padding-bottom: 8px; }
.exam-page #detailList { display: grid; gap: 0; }
.exam-page #detailList .qcard { padding: 26px 0; border: 0; border-top: 1px solid var(--border); border-radius: 0; background: transparent; }
.exam-page #detailList .opts { display: grid; gap: 8px; margin: 16px 0; }
.exam-page #detailList .optrow { display: flex; align-items: baseline; gap: 10px; padding: 10px 12px; border: 1px solid var(--border); border-radius: 7px; }
.exam-page #detailList .optrow .lb { font-weight: 650; flex-shrink: 0; }
.exam-page #detailList .optrow.right { background: #edf8f1; border-color: #cce8d5; color: #166534; }
.exam-page #detailList .optrow.wrong { background: #fdf1f0; border-color: #f4d1ce; color: #a32922; }
.exam-page .ans { padding: 14px 0; border-top: 1px solid var(--border); font-weight: 650; overflow-wrap: anywhere; }
.exam-page .ans .k { margin-right: 8px; font-size: 12px; color: var(--text-mid); font-weight: 400; }
.exam-page .exp { line-height: 1.9; padding: 14px 16px; border-radius: 8px; background: var(--bg-soft); overflow-wrap: anywhere; }
.exam-page .exp .k { display: block; margin-bottom: 8px; }
.exam-page .exp p { margin: 0; }
.exam-page details.srcbox { padding: 0; border-style: solid; margin-top: 16px; }
.exam-page .srcbox > summary { padding: 12px 14px; cursor: pointer; font-weight: 650; overflow-wrap: anywhere; }
.exam-page .srcbox > summary .tag { margin-left: 6px; }
.exam-page .srcbox > .source-content { padding: 0 14px 14px; }
.exam-page .srctext { background: var(--panel); overflow-wrap: anywhere; }
.exam-page .src { margin-top: 12px; }
.exam-page #records { overflow-x: auto; }
.exam-page .rec { width: 100%; border-collapse: collapse; white-space: nowrap; }
.exam-page .rec :is(th,td) { padding: 12px; text-align: left; border-bottom: 1px solid var(--border); }
.exam-page .rec th { font-size: 12px; font-weight: 500; color: var(--text-mid); }
@media (max-width: 1100px) {
  .exam-page .topbar { gap: 8px; padding: 12px 20px; }
  .exam-page .topbar > .brand { padding: 0; }
  .exam-page .kpis { margin-left: auto; }
  .exam-page .exam-workspace { grid-template-columns: 186px minmax(0,1fr); gap: 18px; }
  .exam-page .qsplit.with-material { grid-template-columns: minmax(0,1fr); gap: 18px; }
  .exam-page .qsplit.with-material .mpanel { position: static; max-height: none; }
  .exam-page .qsplit.with-material .mblank { height: 0; }
  .exam-page .qcard { padding: 22px; }
}
@media (max-width: 760px) {
  .exam-page .topbar { padding: 14px 16px; gap: 10px; }
  .exam-page .topbar > .brand { width: 100%; }
  .exam-page .topbar > .brand small { max-width: 270px; font-size: 10px; }
  .exam-page .topnav { gap: 2px; width: 100%; }
  .exam-page .topnav a { padding: 6px 8px; font-size: 12px; }
  .exam-page .topbar > .spacer { display: none; }
  .exam-page .kpis { display: none; }
  .exam-page .exam-shell { padding: 16px 12px 32px; }
  .exam-page .panel { padding: 20px 16px; border-radius: 10px; }
  .exam-page .panel h2 { font-size: 17px; }
  .exam-page .formgrid { grid-template-columns: minmax(0,1fr); }
  .exam-page .exam-head { display: grid; grid-template-columns: minmax(0,1fr) auto auto; padding: 12px; gap: 10px; margin-bottom: 14px; }
  .exam-page .exam-head > div:first-child { grid-column: 1/3; }
  .exam-page .exam-head > div:nth-child(2) { grid-column: 3; grid-row: 1; }
  .exam-page .exam-head #quitBtn { grid-column: 2; }
  .exam-page #submitBtn { grid-column: 3; }
  .exam-page .exam-head #examTitle { font-size: 14px !important; gap: 4px; }
  .exam-page .timer { font-size: 23px; }
  .exam-page #progressText { font-size: 10px !important; white-space: normal !important; }
  .exam-page .progress-track { width: 50px; flex-shrink: 0; }
  .exam-page .exam-workspace { grid-template-columns: minmax(0,1fr); gap: 14px; }
  .exam-page .exam-sidebar { position: static; }
  .exam-page .question-navigator { padding: 12px 14px; }
  .exam-page .question-navigator > summary { min-height: 24px; font-size: 14px; }
  .exam-page .qnav { grid-template-columns: repeat(auto-fit,minmax(40px,1fr)); max-height: 236px; gap: 8px; }
  .exam-page .qnav button { min-height: 42px; }
  .exam-page .qcard { padding: 20px 16px; border-radius: 10px; }
  .exam-page .qcard .stem { font-size: 15px; }
  .exam-page .qhead { gap: 5px; margin-bottom: 16px; }
  .exam-page .opts-vertical .optrow { padding: 12px; min-height: 48px; }
  .exam-page .qcard .pagebar { gap: 8px; }
  .exam-page .btn { min-height: 42px; }
  .exam-page .exam-material { padding: 16px; }
  .exam-page .timingbar { gap: 6px; margin-bottom: 12px; }
  .exam-page .tb-item { font-size: 11px; padding: 5px 8px; }
  .exam-page .result-heading { gap: 16px; align-items: flex-start; }
  .exam-page .score-hero { min-width: 112px; padding-right: 16px; }
  .exam-page .score-hero .num { font-size: 40px; }
  .exam-page .score-hero .num span { font-size: 16px !important; }
  .exam-page .result-summary h1 { font-size: 17px; }
  .exam-page .result-summary .lbl { font-size: 12px; }
  .exam-page .statgrid { grid-template-columns: repeat(2,minmax(0,1fr)); gap: 18px; padding: 18px 0; }
  .exam-page .stat b { font-size: 24px; }
  .exam-page .result-insights { grid-template-columns: minmax(0,1fr); gap: 16px; margin-bottom: 16px; }
  .exam-page .result-actions { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 8px; }
  .exam-page .result-actions .btn { padding: 8px; font-size: 12px; }
  .exam-page #detailList .qcard { padding: 22px 0; }
  .exam-page #detailList .qhead .btn { margin-left: 0 !important; }
  .exam-page .srcbox > summary { padding: 12px; }
}
@media (prefers-reduced-motion: reduce) {
  .exam-page *, .exam-page *::before, .exam-page *::after { transition: none !important; scroll-behavior: auto !important; }
}