:root {
  --navy: #082f57;
  --blue: #0b5f9e;
  --blue-2: #1177bd;
  --blue-soft: #eaf4fb;
  --gold: #c59638;
  --gold-text: #76500d;
  --gold-soft: #fbf4e5;
  --red: #b42318;
  --red-soft: #fef0ee;
  --green: #107052;
  --green-soft: #eaf7f2;
  --ink: #132238;
  --muted: #5d6b7d;
  --line: #d8e1eb;
  --surface: #ffffff;
  --page: #f4f7fa;
  --shadow: 0 14px 42px rgba(8, 47, 87, .09);
  --radius: 16px;
  font-family: Arial, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--page);
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; }
body { margin: 0; min-height: 100vh; background: var(--page); color: var(--ink); font-size: 16px; line-height: 1.55; }
button, input, textarea, select { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button { cursor: pointer; }
button:disabled { cursor: not-allowed; opacity: .55; }
a { color: inherit; text-decoration: none; }

.topbar, .teacher-topbar, .present-header {
  position: sticky; top: 0; z-index: 30; min-height: 72px; padding: 10px 24px;
  display: flex; align-items: center; gap: 20px; background: rgba(255,255,255,.97);
  border-bottom: 1px solid var(--line); box-shadow: 0 3px 16px rgba(8,47,87,.05);
}

.brand { display: inline-flex; align-items: center; gap: 11px; min-width: 260px; }
.brand__mark {
  width: 45px; height: 45px; display: grid; place-items: center; flex: 0 0 auto;
  color: white; background: var(--navy); font-weight: 800; letter-spacing: -.5px;
  border: 3px solid #d7b05c; border-radius: 50%;
}
.brand strong { display: block; color: var(--navy); font-size: .84rem; letter-spacing: .05em; line-height: 1.2; }
.brand small { display: block; color: var(--muted); font-size: .78rem; margin-top: 4px; }
.brand--large .brand__mark { width: 54px; height: 54px; font-size: 1.1rem; }
.brand--large strong { font-size: .94rem; }

.live-strip, .teacher-live, .present-clocks { margin-left: auto; display: flex; align-items: center; gap: 14px; }
.live-strip span, .teacher-live .live-status, .present-clocks .live-status { color: var(--muted); font-size: .88rem; }
.live-strip strong, .teacher-live strong, .present-clocks strong { color: var(--navy); font-size: 1.35rem; font-variant-numeric: tabular-nums; }
.teacher-live b, .present-clocks b { color: var(--gold-text); font-size: 1.15rem; font-variant-numeric: tabular-nums; }
.live-clock { display: grid; gap: 1px; line-height: 1.08; }
.live-clock small { color: var(--muted); font-size: .75rem; font-weight: 800; letter-spacing: .04em; text-transform: uppercase; }
.live-clock strong, .live-clock b { display: block; }
.status-dot::before { content: ""; display: inline-block; width: 8px; height: 8px; margin-right: 7px; border-radius: 50%; background: var(--green); }
.status-dot.is-offline::before { background: var(--red); }
.identity-chip { border: 1px solid #b9c9da; border-radius: 999px; background: white; color: var(--navy); padding: 8px 14px; font-weight: 700; }

.button { min-height: 44px; padding: 9px 16px; border-radius: 9px; border: 1px solid transparent; font-weight: 700; display: inline-flex; align-items: center; justify-content: center; gap: 7px; }
.button--primary { background: var(--navy); color: white; }
.button--accent { background: var(--blue-2); color: white; }
.button--ghost { background: white; color: var(--navy); border-color: #b9c9da; }
.button--warning { background: var(--gold-soft); color: #76500d; border-color: #dfc17d; }
.button--danger { background: var(--red); color: white; }
.icon-control { width: 44px; height: 44px; border: 1px solid var(--line); background: white; border-radius: 10px; font-size: 1.4rem; }

.class-moved { position: sticky; top: 73px; z-index: 20; padding: 10px 22px; color: #5d430e; background: var(--gold-soft); border-bottom: 1px solid #e6cb8f; text-align: center; }
.class-moved button { margin-left: 14px; border: 0; background: var(--navy); color: white; border-radius: 7px; padding: 6px 12px; font-weight: 700; }

.student-shell { width: min(1480px, 100%); margin: 0 auto; display: grid; grid-template-columns: 300px minmax(0,1fr); gap: 26px; padding: 26px; }
.journey-panel { position: sticky; top: 98px; align-self: start; padding: 20px; background: white; border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.journey-panel__head { display: flex; align-items: center; justify-content: space-between; padding-bottom: 14px; border-bottom: 1px solid var(--line); }
.journey-panel__head span { font-size: .75rem; color: var(--muted); font-weight: 800; letter-spacing: .09em; }
.journey-panel__head strong { color: var(--gold-text); font-size: 1.18rem; font-variant-numeric: tabular-nums; }
.chapter-nav { display: grid; gap: 7px; margin: 13px 0; }
.chapter-link { width: 100%; min-height: 61px; display: grid; grid-template-columns: 34px 1fr auto; align-items: center; gap: 10px; border: 1px solid transparent; border-radius: 11px; background: #f7f9fb; color: var(--ink); padding: 8px; text-align: left; }
.chapter-link b { width: 32px; height: 32px; display: grid; place-items: center; border-radius: 50%; background: #dfe8f1; color: var(--navy); }
.chapter-link span strong, .chapter-link span small { display: block; }
.chapter-link span strong { font-size: .84rem; color: var(--navy); }
.chapter-link span small { font-size: .76rem; color: var(--muted); }
.chapter-link em { color: var(--muted); font-size: .75rem; font-style: normal; }
.chapter-link.is-live { border-color: #8ec6e8; background: var(--blue-soft); }
.chapter-link.is-active b { background: var(--navy); color: white; }
.chapter-link.is-locked { opacity: .58; }
.follow-toggle, .switch-line { display: flex; gap: 9px; align-items: center; font-weight: 700; color: var(--navy); }
.follow-toggle input, .switch-line input { width: 19px; height: 19px; accent-color: var(--blue); }
.privacy-note { margin: 15px 0 0; padding-top: 14px; border-top: 1px solid var(--line); color: var(--muted); font-size: .78rem; line-height: 1.45; }

.chapter-view { min-width: 0; display: grid; gap: 20px; }
.chapter-hero { position: relative; overflow: hidden; padding: 34px 38px 38px; color: white; background: linear-gradient(120deg,var(--navy),#0c568d); border-radius: 20px; box-shadow: var(--shadow); }
.chapter-hero::after { content: ""; position: absolute; width: 260px; height: 260px; right: -100px; top: -130px; border: 35px solid rgba(213,168,78,.32); border-radius: 50%; }
.chapter-hero__meta { display: flex; gap: 10px; position: relative; z-index: 1; }
.chapter-hero__meta span { padding: 5px 9px; font-size: .76rem; font-weight: 800; letter-spacing: .06em; border: 1px solid rgba(255,255,255,.38); border-radius: 999px; }
.story-time { margin: 28px 0 5px; color: #f4d58c; font-weight: 800; }
.chapter-hero h1 { position: relative; z-index: 1; max-width: 900px; margin: 0; font-size: clamp(1.85rem,3.2vw,3rem); line-height: 1.12; letter-spacing: -.025em; }
.decision-question { position: relative; z-index: 1; max-width: 900px; margin: 18px 0 0; color: #dbeefa; font-size: 1.08rem; }

.content-section, .source-section, .ai-workbench, .exercise-section, .quiz-section, .chapter-close, .locked-panel, .error-panel, .loading-panel { background: white; border: 1px solid var(--line); border-radius: var(--radius); box-shadow: 0 8px 28px rgba(8,47,87,.055); }
.content-section { display: grid; grid-template-columns: 54px 1fr; gap: 16px; padding: 28px 30px; }
.section-number { color: #b7c4d2; font-size: 1rem; font-weight: 800; letter-spacing: .08em; padding-top: 5px; }
.section-kicker { color: var(--blue); font-size: .76rem; font-weight: 800; letter-spacing: .1em; }
.content-section h2, .section-heading h2, .ai-workbench h2, .quiz-section h2 { margin: 5px 0 12px; color: var(--navy); font-size: 1.45rem; line-height: 1.25; }
.content-section p { margin: 0; font-size: 1.04rem; }
.content-section ul { margin: 8px 0 0; padding-left: 20px; }
.content-section li { margin: 7px 0; }
.focus-section { border-left: 5px solid var(--gold); }

.source-section, .ai-workbench, .exercise-section, .quiz-section { padding: 28px 30px; }
.section-heading, .ai-workbench__head { display: flex; align-items: flex-start; justify-content: space-between; gap: 20px; }
.section-heading small { max-width: 280px; color: var(--muted); text-align: right; }
.document-cards { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 12px; margin-top: 16px; }
.document-card { min-height: 170px; display: flex; flex-direction: column; align-items: flex-start; border: 1px solid #cbd8e4; border-radius: 12px; background: #fbfcfd; padding: 16px; text-align: left; }
.document-card:hover { border-color: var(--blue); background: var(--blue-soft); }
.document-card > span { color: var(--blue); font-size: .75rem; font-weight: 800; text-transform: uppercase; }
.document-card strong { margin: 7px 0; color: var(--navy); line-height: 1.25; }
.document-card p { margin: 0; color: var(--muted); font-size: .86rem; }
.document-card em { margin-top: auto; padding-top: 12px; color: var(--green); font-size: .75rem; font-style: normal; font-weight: 700; }
.loading-inline { color: var(--muted); padding: 20px; }

.ai-workbench { border-top: 6px solid var(--blue); }
.ai-status { padding: 6px 10px; border-radius: 999px; color: var(--green); background: var(--green-soft); font-size: .78rem; font-weight: 700; }
.source-selector { display: flex; flex-wrap: wrap; gap: 8px; margin: 8px 0 16px; }
.source-check { display: flex; align-items: center; gap: 7px; padding: 7px 10px; background: var(--blue-soft); border: 1px solid #b9d8eb; border-radius: 8px; color: var(--navy); font-size: .8rem; font-weight: 700; }
.source-check input { accent-color: var(--blue); }
.prompt-label, .system-card label, .teacher-login__card label, .modal--join label, .modal--reset label { display: grid; gap: 7px; color: var(--navy); font-weight: 700; }
textarea, input, select { width: 100%; border: 1px solid #b7c7d8; border-radius: 9px; background: white; color: var(--ink); padding: 11px 12px; outline: none; }
input:not([type="checkbox"]):not([type="radio"]), select { min-height: 44px; }
textarea { resize: vertical; line-height: 1.55; }
textarea:focus, input:focus, select:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(17,119,189,.14); }
.expected-output { margin: 14px 0; padding: 13px 16px; background: #f7f9fb; border-left: 4px solid var(--gold); }
.expected-output ul { margin: 7px 0 0; padding-left: 20px; }
.ai-result { margin-top: 18px; border-top: 1px solid var(--line); padding-top: 18px; }
.ai-answer > span, .fallback-result > span { color: var(--blue); font-size: .76rem; font-weight: 800; letter-spacing: .08em; }
.ai-answer p, .fallback-result p { white-space: pre-wrap; }
.citations { display: grid; gap: 8px; margin-top: 14px; }
.citations blockquote { margin: 0; padding: 12px 14px; background: var(--blue-soft); border-left: 4px solid var(--blue); color: #26384c; }
.citations blockquote span { display: block; color: var(--navy); font-weight: 800; margin-bottom: 5px; }
.missing-info, .ai-error { margin-top: 12px; padding: 13px 15px; background: var(--red-soft); border-radius: 9px; color: #7e271f; }
.fallback-result { margin-top: 12px; padding: 14px; background: var(--gold-soft); border: 1px solid #e4c984; border-radius: 9px; }

.role-options { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 10px; margin: 16px 0; }
.role-option { border: 1px solid #cad6e3; border-radius: 10px; background: #fbfcfd; padding: 14px; text-align: left; }
.role-option strong, .role-option span { display: block; }
.role-option strong { color: var(--navy); }
.role-option span { color: var(--muted); font-size: .84rem; margin-top: 5px; }
.role-option.is-selected { border-color: var(--blue); background: var(--blue-soft); }
.criteria-row { display: flex; flex-wrap: wrap; gap: 7px; margin: 12px 0; }
.criteria-row span { color: var(--green); background: var(--green-soft); padding: 5px 9px; border-radius: 999px; font-size: .78rem; font-weight: 700; }

.quiz-section { border-left: 6px solid var(--gold); }
.quiz-section:not(.is-open) .quiz-choice { opacity: .72; }
.quiz-choices { display: grid; gap: 9px; margin-top: 13px; }
.quiz-choice { display: grid; grid-template-columns: 38px 1fr; gap: 10px; align-items: center; padding: 11px; border: 1px solid #cbd7e3; border-radius: 10px; background: white; color: var(--ink); text-align: left; }
.quiz-choice b { width: 34px; height: 34px; display: grid; place-items: center; border-radius: 50%; background: #e6edf4; color: var(--navy); }
.quiz-choice.is-selected { border-color: var(--blue); background: var(--blue-soft); }
.quiz-choice.is-selected b { background: var(--blue); color: white; }
.quiz-result { margin-top: 13px; color: var(--muted); }
.quiz-result > strong { color: var(--green); font-size: 1.08rem; }
.result-bars { display: grid; gap: 6px; margin-top: 10px; }
.result-bars > div { display: grid; grid-template-columns: 24px 1fr 72px; gap: 7px; align-items: center; }
.result-bars i { display: block; height: 9px; background: linear-gradient(90deg,var(--blue) var(--value),#e3e9ef var(--value)); border-radius: 999px; }
.result-bars em { font-style: normal; font-size: .78rem; text-align: right; }
.chapter-close { padding: 25px 30px; background: var(--navy); color: white; }
.chapter-close span { color: #e6c677; font-size: .75rem; font-weight: 800; letter-spacing: .1em; }
.chapter-close strong { display: block; margin: 7px 0; font-size: 1.25rem; }
.chapter-close p { color: #d8e6f1; margin: 0; }
.loading-panel, .locked-panel, .error-panel { min-height: 300px; display: grid; place-items: center; align-content: center; padding: 30px; text-align: center; }
.loader { width: 36px; height: 36px; border: 4px solid #dce6ef; border-top-color: var(--blue); border-radius: 50%; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

.modal { width: min(720px,calc(100vw - 28px)); max-height: calc(100vh - 30px); padding: 0; border: 0; border-radius: 18px; box-shadow: 0 28px 80px rgba(0,28,56,.25); }
.modal::backdrop { background: rgba(2,24,48,.62); backdrop-filter: blur(3px); }
.modal form, .modal__document, #documentBody { padding: 30px; }
.modal h1 { margin: 6px 0 10px; color: var(--navy); line-height: 1.18; }
.modal__eyebrow { color: var(--blue); font-size: .77rem; font-weight: 800; letter-spacing: .1em; }
.modal--join label { margin-top: 13px; }
.modal--join label span { color: var(--muted); font-size: .75rem; font-weight: 400; }
.modal__notice { margin-top: 16px; padding: 12px; background: var(--blue-soft); border-radius: 8px; color: #294158; font-size: .84rem; }
.modal__actions { display: flex; justify-content: flex-end; gap: 9px; margin-top: 20px; }
.modal__close { position: sticky; float: right; top: 12px; right: 12px; width: 44px; height: 44px; margin: 12px 12px 0 0; border: 0; border-radius: 50%; background: #edf2f6; color: var(--navy); font-size: 1.5rem; z-index: 2; }
.join-anonymous-top { display: none; }
button:focus-visible, a:focus-visible, summary:focus-visible, [role="tabpanel"]:focus-visible { outline: 3px solid #d7a741; outline-offset: 3px; }
.document-status { display: inline-block; margin: 4px 0 16px; padding: 5px 9px; border-radius: 999px; background: var(--green-soft); color: var(--green); font-size: .78rem; font-weight: 700; }
#documentBody pre { white-space: pre-wrap; word-wrap: break-word; margin: 0; padding: 20px; background: #f6f8fa; border: 1px solid var(--line); border-radius: 10px; font: 16px/1.65 Arial,"Segoe UI",sans-serif; }
.toast { position: fixed; z-index: 100; right: 22px; bottom: 22px; max-width: 420px; transform: translateY(20px); opacity: 0; padding: 12px 16px; border-radius: 9px; color: white; background: var(--navy); box-shadow: var(--shadow); transition: .2s ease; pointer-events: none; }
.toast.is-visible { opacity: 1; transform: translateY(0); }
.toast--success { background: var(--green); }
.toast--error { background: var(--red); }

/* Presentation */
.present-page { height: 100vh; overflow: hidden; background: #eef3f7; }
.present-header { position: static; height: 82px; }
.present-clocks strong { font-size: 1.65rem; }
.present-shell { height: calc(100vh - 82px); display: grid; grid-template-columns: minmax(0,1fr) 340px; gap: 18px; padding: 18px; }
.present-content { min-width: 0; display: flex; flex-direction: column; gap: 14px; padding: clamp(22px,2.4vw,42px); background: white; border: 1px solid var(--line); border-radius: 16px; box-shadow: var(--shadow); overflow: hidden; }
.present-chapter-head > span { color: var(--blue); font-size: .9rem; font-weight: 800; letter-spacing: .08em; }
.present-chapter-head > p { margin: 13px 0 4px; color: var(--gold-text); font-size: 1.18rem; font-weight: 800; }
.present-chapter-head h1 { max-width: 1050px; margin: 0; color: var(--navy); font-size: clamp(2rem,3.4vw,3.4rem); line-height: 1.08; letter-spacing: -.03em; }
.present-story-grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 18px; margin-top: 8px; }
.present-story-grid section { padding: 19px 21px; background: #f7f9fb; border-left: 5px solid var(--blue); }
.present-story-grid h2 { margin: 5px 0 9px; color: var(--navy); font-size: clamp(1.25rem,1.8vw,1.8rem); line-height: 1.25; }
.present-story-grid p { margin: 0; font-size: clamp(.98rem,1.25vw,1.28rem); }
.present-focus { border-left-color: var(--gold) !important; }
.present-focus ul { margin: 7px 0; padding-left: 20px; font-size: clamp(.95rem,1.15vw,1.16rem); }
.present-prompt { padding: 17px 20px; border: 1px solid #b9d5e7; background: var(--blue-soft); }
.present-prompt p { margin: 5px 0 0; font-size: clamp(.98rem,1.18vw,1.2rem); }
.present-takeaway { margin-top: auto; padding: 14px 18px; background: var(--navy); color: white; border-left: 7px solid var(--gold); }
.present-takeaway span { display: block; color: #e7c87f; font-size: .75rem; font-weight: 800; letter-spacing: .1em; }
.present-takeaway strong { display: block; margin-top: 4px; font-size: clamp(1rem,1.25vw,1.35rem); }
.present-side { display: flex; flex-direction: column; gap: 12px; min-width: 0; }
.qr-panel { padding: 15px; background: white; border: 1px solid var(--line); border-radius: 14px; text-align: center; }
.qr-panel > span { display: block; color: var(--blue); font-size: .76rem; font-weight: 800; letter-spacing: .09em; }
.qr-panel img { display: block; width: min(210px,100%); aspect-ratio: 1; margin: 8px auto; }
.qr-panel strong { display: block; color: var(--navy); font-size: .84rem; word-break: break-all; }
.qr-panel small { display: block; margin-top: 5px; color: var(--muted); }
.present-journey { list-style: none; margin: 0; padding: 13px; background: white; border: 1px solid var(--line); border-radius: 14px; display: grid; gap: 5px; }
.present-journey li { display: grid; grid-template-columns: 30px 1fr; gap: 8px; align-items: center; padding: 5px; border-radius: 8px; }
.present-journey li b { width: 27px; height: 27px; display: grid; place-items: center; border-radius: 50%; background: #e8eef4; color: var(--navy); }
.present-journey li span strong, .present-journey li span small { display: block; }
.present-journey li span strong { color: var(--navy); font-size: .75rem; }
.present-journey li span small { color: var(--muted); font-size: .75rem; }
.present-journey li.is-current { background: var(--blue-soft); }
.present-journey li.is-current b { background: var(--blue); color: white; }
.present-journey li.is-done b { background: var(--green); color: white; }
.present-connection { margin-top: auto; padding: 9px; border-radius: 9px; text-align: center; color: var(--green); background: var(--green-soft); font-size: .78rem; font-weight: 700; }
.present-connection.is-offline { color: var(--red); background: var(--red-soft); }
.present-quiz h2 { margin: 6px 0 14px; color: var(--navy); font-size: clamp(1.65rem,2.8vw,2.8rem); line-height: 1.14; }
.present-choices { display: grid; gap: 10px; }
.present-choice { display: grid; grid-template-columns: 44px 1fr 100px; gap: 12px; align-items: center; padding: 13px; border: 2px solid var(--line); border-radius: 11px; }
.present-choice b { width: 40px; height: 40px; display: grid; place-items: center; border-radius: 50%; background: #e6edf4; color: var(--navy); }
.present-choice span { font-size: clamp(1rem,1.35vw,1.35rem); }
.present-choice em { color: var(--blue); font-style: normal; font-weight: 800; text-align: right; }
.present-choice.is-correct { border-color: var(--green); background: var(--green-soft); }
.present-choice.is-correct b { background: var(--green); color: white; }
.present-answer, .present-wait { margin-top: 13px; padding: 12px 16px; background: var(--gold-soft); border-left: 5px solid var(--gold); }
.present-answer p { margin: 4px 0 0; }
.projection-head { position: relative; }
.projection-head > span { color: var(--blue); font-size: .84rem; font-weight: 800; letter-spacing: .09em; }
.projection-head > small { position: absolute; top: 0; right: 0; color: var(--muted); font-weight: 700; }
.projection-head h1 { max-width: 1050px; margin: 8px 0 0; color: var(--navy); font-size: clamp(2rem,3.2vw,3.2rem); line-height: 1.08; letter-spacing: -.025em; }
.projection-body { min-height: 0; flex: 1; display: grid; align-content: center; overflow: hidden; }
.projection-cover { height: 100%; display: flex; flex-direction: column; justify-content: center; padding: 2vw; background: linear-gradient(145deg,#f8fbfd 0%,#eef5f9 100%); border-left: 9px solid var(--gold); }
.projection-cover > span { color: var(--blue); font-weight: 800; letter-spacing: .12em; }
.projection-cover h1 { max-width: 950px; margin: 20px 0 10px; color: var(--navy); font-size: clamp(3rem,5vw,5.2rem); line-height: 1.02; letter-spacing: -.04em; }
.projection-cover p { margin: 0 0 34px; color: var(--muted); font-size: clamp(1.2rem,2vw,2rem); }
.projection-cover > strong { max-width: 760px; padding: 18px 22px; color: white; background: var(--blue); border-left: 7px solid var(--gold); font-size: clamp(1.2rem,1.8vw,1.75rem); }
.projection-cover > small { margin-top: 22px; color: var(--muted); }
.projection-list { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 14px; margin: 12px 0; padding: 0; list-style: none; }
.projection-list li { padding: 18px 20px; border-left: 5px solid var(--blue); background: #f5f8fa; color: var(--navy); font-size: clamp(1rem,1.45vw,1.45rem); font-weight: 700; }
.projection-lead { max-width: 1000px; color: var(--ink); font-size: clamp(1.1rem,1.6vw,1.65rem); line-height: 1.42; }
.projection-columns { display: grid; gap: 16px; }
.projection-columns--2 { grid-template-columns: repeat(2,minmax(0,1fr)); }
.projection-columns--3 { grid-template-columns: repeat(3,minmax(0,1fr)); }
.projection-columns section { min-height: 205px; padding: 22px; border: 1px solid #d6e0e7; border-top: 6px solid var(--blue); background: #f8fafb; }
.projection-columns section:nth-child(2) { border-top-color: var(--gold); }
.projection-columns section:nth-child(3) { border-top-color: var(--green); }
.projection-columns section > strong { display: block; color: var(--navy); font-size: clamp(1.2rem,1.65vw,1.7rem); }
.projection-columns .projection-list { grid-template-columns: 1fr; gap: 7px; }
.projection-columns .projection-list li { padding: 9px 0 9px 15px; background: transparent; font-size: clamp(.95rem,1.15vw,1.15rem); font-weight: 500; }
.projection-table { overflow: hidden; border: 1px solid #d4dee6; border-radius: 10px; }
.projection-table table { width: 100%; border-collapse: collapse; font-size: clamp(.83rem,1.12vw,1.12rem); }
.projection-table th { padding: 12px 14px; text-align: left; color: white; background: var(--navy); }
.projection-table td { padding: 12px 14px; vertical-align: top; border-top: 1px solid #dce4ea; }
.projection-table tr:nth-child(even) td { background: #f5f8fa; }
.projection-metrics { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 16px; }
.projection-metrics article { min-height: 145px; display: flex; flex-direction: column; justify-content: center; padding: 20px; border-left: 7px solid var(--blue); background: #f4f8fb; }
.projection-metrics strong { color: var(--navy); font-size: clamp(2.4rem,4vw,4.4rem); line-height: 1; }
.projection-metrics span { margin-top: 10px; font-size: clamp(.95rem,1.3vw,1.3rem); }
.projection-before-after { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 18px; }
.projection-before-after section { min-height: 190px; padding: 23px; background: var(--red-soft); border-left: 7px solid var(--red); }
.projection-before-after section:last-child { background: var(--green-soft); border-left-color: var(--green); }
.projection-before-after span { color: var(--red); font-size: .78rem; font-weight: 900; letter-spacing: .1em; }
.projection-before-after section:last-child span { color: var(--green); }
.projection-before-after p { color: var(--navy); font-size: clamp(1.05rem,1.55vw,1.55rem); line-height: 1.4; }
.projection-prompt { margin: 0 0 18px; padding: 22px 25px; border: 1px solid #b8d2e2; border-left: 7px solid var(--blue); background: var(--blue-soft); color: var(--navy); font-size: clamp(1rem,1.4vw,1.4rem); line-height: 1.45; }
.projection-checks { grid-template-columns: repeat(4,minmax(0,1fr)); }
.projection-checks li { padding: 14px; font-size: clamp(.85rem,1vw,1.02rem); }

/* Teacher */
.teacher-page { background: #edf2f6; }
.teacher-topbar { position: sticky; }
.teacher-top-actions { display: flex; gap: 8px; }
.teacher-shell { width: min(1580px,100%); margin: 0 auto; padding: 20px; }
.control-room { padding: 18px; background: var(--navy); color: white; border-radius: 15px; box-shadow: var(--shadow); }
.control-room .button--primary { color: var(--navy); background: white; border-color: #b9c9da; }
.control-summary { display: grid; grid-template-columns: repeat(4,1fr); gap: 12px; }
.control-summary > div { padding: 10px 14px; border-left: 1px solid rgba(255,255,255,.2); }
.control-summary span { display: block; color: #bcd5e8; font-size: .75rem; font-weight: 800; letter-spacing: .09em; }
.control-summary strong { font-size: 1.65rem; }
.control-summary small { color: #bcd5e8; margin-left: 4px; }
.main-controls, .quiz-controls { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; align-items: center; }
.quiz-controls { padding-top: 13px; border-top: 1px solid rgba(255,255,255,.18); }
.quiz-controls span { margin-left: auto; color: #dceaf4; }
.teacher-chapters { display: grid; grid-template-columns: repeat(6,1fr); gap: 7px; margin-top: 14px; }
.teacher-chapters button { min-height: 48px; display: flex; gap: 8px; align-items: center; border: 1px solid rgba(255,255,255,.28); border-radius: 8px; color: white; background: rgba(255,255,255,.07); }
.teacher-chapters button b { width: 26px; height: 26px; display: grid; place-items: center; border-radius: 50%; background: rgba(255,255,255,.18); }
.teacher-chapters button.is-active { color: var(--navy); background: #f4d88f; border-color: #f4d88f; }
.teacher-grid { display: grid; grid-template-columns: minmax(0,1fr) 380px; gap: 18px; margin-top: 18px; align-items: start; }
.script-panel { position: sticky; top: 92px; background: white; border: 1px solid var(--line); border-radius: 15px; box-shadow: var(--shadow); overflow: hidden; }
.script-panel__head { display: flex; justify-content: space-between; align-items: center; gap: 18px; padding: 20px 22px; background: #f7f9fb; border-bottom: 1px solid var(--line); }
.script-panel__head span { color: var(--blue); font-size: .75rem; font-weight: 800; letter-spacing: .1em; }
.script-panel__head h1 { margin: 4px 0 0; color: var(--navy); font-size: 1.45rem; }
.minute-nav { display: flex; align-items: center; gap: 8px; }
.minute-nav button { width: 44px; height: 44px; border: 1px solid var(--line); border-radius: 8px; background: white; color: var(--navy); }
.minute-nav strong { min-width: 50px; color: var(--navy); font-size: 1.8rem; text-align: center; }
.script-block { padding: 20px 22px; border-bottom: 1px solid var(--line); }
.script-block > span { display: block; color: var(--blue); font-size: .75rem; font-weight: 800; letter-spacing: .1em; }
.script-block p { margin: 7px 0 0; font-size: 1.06rem; }
.script-block--say { border-left: 6px solid var(--gold); }
.script-block--say p { color: var(--navy); font-size: 1.24rem; line-height: 1.62; }
.script-block--check { background: var(--green-soft); }
.script-block--fallback { background: var(--gold-soft); }
.script-footer { display: flex; justify-content: space-between; align-items: center; padding: 14px 22px; color: var(--muted); font-size: .84rem; }
.script-footer label { color: var(--navy); font-weight: 700; }
.script-footer input { width: auto; accent-color: var(--blue); }
.teacher-side { display: grid; gap: 14px; }
.system-card, .qr-card { padding: 17px; background: white; border: 1px solid var(--line); border-radius: 13px; box-shadow: 0 7px 22px rgba(8,47,87,.05); }
.card-title { display: flex; justify-content: space-between; align-items: center; margin-bottom: 11px; }
.card-title > span, .qr-card > span { color: var(--blue); font-size: .75rem; font-weight: 800; letter-spacing: .09em; }
.card-title button { border: 0; color: var(--blue); background: transparent; font-size: .78rem; font-weight: 700; }
.health-row { display: flex; justify-content: space-between; gap: 10px; padding: 8px 0; border-top: 1px solid #edf1f5; }
.health-row strong { text-align: right; }
.is-good { color: var(--green) !important; }
.is-bad { color: var(--red) !important; }
.qr-card { text-align: center; }
.qr-card img { display: block; width: 190px; max-width: 100%; margin: 8px auto; }
.qr-card strong { display: block; color: var(--navy); word-break: break-all; }
.qr-card .button { margin-top: 9px; width: 100%; }
.system-card label { margin-top: 10px; font-size: .82rem; }
.switch-line { display: flex !important; margin: 13px 0; }
.switch-line input { width: 19px; }
.participant-list { display: grid; gap: 6px; max-height: 310px; overflow: auto; }
.participant-list > div { padding: 9px 10px; background: #f7f9fb; border-radius: 8px; }
.participant-list b, .participant-list span, .participant-list small { display: block; }
.participant-list b { color: var(--blue); font-size: .75rem; }
.participant-list span { color: var(--navy); font-weight: 700; }
.participant-list small { color: var(--muted); }
.picked-participant { margin-bottom: 9px; padding: 12px; color: white; background: var(--navy); border-left: 5px solid var(--gold); }
.picked-participant span, .picked-participant strong, .picked-participant small { display: block; }
.picked-participant span { color: #efd695; font-size: .75rem; font-weight: 800; }
.picked-participant strong { font-size: 1.15rem; }
.maintenance-card { display: grid; gap: 8px; }
.teacher-login { min-height: 100vh; display: grid; place-items: center; padding: 20px; background: linear-gradient(145deg,#eaf2f8,#f7f9fb); }
.teacher-login__card { width: min(500px,100%); padding: 32px; background: white; border: 1px solid var(--line); border-top: 6px solid var(--gold); border-radius: 16px; box-shadow: var(--shadow); }
.teacher-login__card h1 { margin: 30px 0 8px; color: var(--navy); }
.teacher-login__card label { margin-top: 18px; }
.teacher-login__card .button { width: 100%; margin-top: 16px; }
.form-error { margin-top: 12px; color: var(--red); }
.data-matrix-section, .practice-paths { padding: 28px; background: white; border: 1px solid var(--line); border-radius: 14px; box-shadow: var(--shadow); }
.data-matrix { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 12px; margin-top: 16px; }
.data-matrix article { padding: 17px; border: 1px solid #d9e2ea; border-top: 4px solid var(--blue); border-radius: 10px; background: #f9fbfc; }
.data-matrix article:last-child { border-top-color: var(--red); }
.data-matrix article > span, .data-matrix article > small { display: block; }
.data-matrix article > span { color: var(--navy); font-weight: 800; }
.data-matrix article > small { min-height: 34px; margin: 4px 0 10px; color: var(--muted); }
.data-matrix article p { margin: 7px 0; font-size: .9rem; }
.reference-strip { display: grid; gap: 8px; margin-top: 13px; padding: 15px; border-left: 4px solid var(--gold); background: #fff9eb; }
.reference-strip strong { color: var(--navy); }
.reference-strip p { margin: 3px 0 0; font-size: .86rem; color: var(--muted); }
.practice-path-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 12px; margin-top: 16px; }
.practice-path { min-height: 130px; padding: 18px; text-align: left; border: 1px solid #cad6e0; border-radius: 10px; background: #f8fafc; color: var(--ink); cursor: pointer; }
.practice-path strong, .practice-path span { display: block; }
.practice-path strong { margin-bottom: 8px; color: var(--navy); font-size: 1.02rem; }
.practice-path span { color: var(--muted); }
.practice-path:hover, .practice-path.is-selected { border-color: var(--blue); background: #eaf4fb; box-shadow: inset 0 0 0 1px var(--blue); }
.ai-warning { margin: 12px 0; padding: 12px 14px; color: #6b4d00; background: #fff6d8; border-left: 4px solid var(--gold); }
.citation-link { display: block; width: 100%; margin-top: 8px; padding: 13px; text-align: left; border: 1px solid #cbd9e4; border-radius: 9px; background: white; cursor: pointer; }
.citation-link span, .citation-link q { display: block; }
.citation-link span { margin-bottom: 6px; color: var(--blue); font-weight: 800; }
.citation-link q { color: var(--ink); }
.quiz-section--locked { border-style: dashed; background: #f6f8fa; box-shadow: none; }

@media (max-width: 1050px) {
  .student-shell { grid-template-columns: 1fr; }
  .journey-panel { position: static; }
  .chapter-nav { grid-template-columns: repeat(3,1fr); }
  .chapter-link { grid-template-columns: 30px 1fr; }
  .chapter-link em { display: none; }
  .teacher-grid { grid-template-columns: 1fr; }
  .script-panel { position: static; }
  .present-shell { grid-template-columns: minmax(0,1fr) 280px; }
}

@media (max-width: 720px) {
  body { font-size: 16px; }
  .topbar { position: static; padding: 9px 13px; flex-wrap: wrap; gap: 8px; }
  .brand { min-width: 0; flex: 1; }
  .brand strong { font-size: .75rem; }
  .brand small { display: none; }
  .brand__mark { width: 40px; height: 40px; }
  .live-strip { width: 100%; order: 3; justify-content: space-between; padding-top: 7px; border-top: 1px solid var(--line); }
  .identity-chip { font-size: .78rem; }
  .class-moved { top: 0; }
  .student-shell { padding: 12px; gap: 12px; }
  .journey-panel { padding: 12px; }
  .chapter-nav { display: flex; overflow-x: auto; padding-bottom: 4px; }
  .chapter-link { min-width: 150px; }
  .chapter-hero { padding: 24px 20px; border-radius: 14px; }
  .chapter-hero h1 { font-size: 1.75rem; }
  .content-section { grid-template-columns: 1fr; padding: 21px 18px; }
  .section-number { display: none; }
  .source-section, .ai-workbench, .exercise-section, .quiz-section, .data-matrix-section, .practice-paths { padding: 21px 18px; }
  .section-heading, .ai-workbench__head { display: block; }
  .section-heading small { display: block; max-width: none; margin-top: 6px; text-align: left; }
  .ai-status { display: inline-block; margin: 4px 0 10px; }
  .document-cards, .role-options, .data-matrix, .practice-path-grid { grid-template-columns: 1fr; }
  .document-card { min-height: 145px; }
  .chapter-close { padding: 20px; }
  .modal form, #documentBody { padding: 22px 18px; }
  .modal__actions { flex-direction: column-reverse; }
  .modal__actions .button { width: 100%; }
}

@media print {
  .topbar, .journey-panel, .class-moved { display: none !important; }
  .student-shell { display: block; padding: 0; }
  .chapter-view { gap: 10px; }
  .button { display: none; }
  body { background: white; }
}

/* Student V2 — bright, formal, mobile-first classroom document */
.learning-topbar { min-height: 78px; }
.learning-clocks { margin-left: auto; display: flex; align-items: stretch; gap: 8px; }
.learning-clocks > div { min-width: 112px; padding: 6px 12px; border-left: 1px solid var(--line); }
.learning-clocks span, .learning-clocks strong { display: block; }
.learning-clocks span { color: var(--muted); font-size: .75rem; font-weight: 800; letter-spacing: .06em; text-transform: uppercase; }
.learning-clocks strong { margin-top: 1px; color: var(--navy); font-size: 1.18rem; font-variant-numeric: tabular-nums; }
.topbar-account { display: flex; align-items: center; gap: 12px; }
.topbar-account .status-dot { color: var(--muted); font-size: .78rem; }

.course-progress { position: sticky; top: 78px; z-index: 25; padding: 10px max(18px,calc((100vw - 1440px)/2)); background: rgba(244,247,250,.97); border-bottom: 1px solid var(--line); box-shadow: 0 5px 20px rgba(8,47,87,.045); backdrop-filter: blur(8px); }
.course-progress__summary { display: none; }
.chapter-nav--horizontal { display: grid; grid-template-columns: repeat(6,minmax(0,1fr)); gap: 7px; margin: 0; }
.chapter-nav--horizontal .chapter-link { min-height: 60px; margin: 0; padding: 7px 9px; background: white; border-color: #dbe4ec; }
.chapter-nav--horizontal .chapter-link b { width: 30px; height: 30px; }
.chapter-nav--horizontal .chapter-link span { min-width: 0; }
.chapter-nav--horizontal .chapter-link span small { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.chapter-nav--horizontal .chapter-link.is-live { border-color: var(--blue); box-shadow: inset 0 -3px 0 var(--blue); }
.chapter-nav--horizontal .chapter-link.is-active { background: var(--blue-soft); }

.learning-shell { width: min(1220px,100%); margin: 0 auto; padding: 22px 24px 90px; }
.learning-toolbar { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 14px; padding: 10px 14px; background: white; border: 1px solid var(--line); border-radius: 11px; }
.safety-reminder { color: #7b3d24; font-size: .8rem; font-weight: 700; }
.chapter-view--v2 { gap: 16px; }
.chapter-view--v2 .chapter-hero { padding: 28px 34px 31px; }
.chapter-view--v2 .chapter-hero h1 { font-size: clamp(1.75rem,2.8vw,2.65rem); }
.chapter-view--v2 .story-time { margin-top: 20px; }

.chapter-tabs { position: sticky; top: 158px; z-index: 19; display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 8px; padding: 8px; background: white; border: 1px solid var(--line); border-radius: 14px; box-shadow: 0 8px 24px rgba(8,47,87,.07); }
.chapter-tab { min-height: 64px; display: grid; grid-template-columns: 34px 1fr; align-items: center; gap: 10px; padding: 8px 10px; border: 1px solid transparent; border-radius: 10px; background: #f5f7f9; color: var(--ink); text-align: left; }
.chapter-tab b { width: 31px; height: 31px; display: grid; place-items: center; border-radius: 50%; background: #dce5ed; color: var(--navy); }
.chapter-tab span, .chapter-tab strong, .chapter-tab small { display: block; }
.chapter-tab strong { color: var(--navy); font-size: .88rem; }
.chapter-tab small { margin-top: 2px; color: var(--muted); font-size: .75rem; }
.chapter-tab.is-active { border-color: #7eb9dd; background: var(--blue-soft); }
.chapter-tab.is-active b { color: white; background: var(--blue); }
.chapter-tab-panel { display: grid; gap: 16px; }

.lesson-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 16px; }
.lesson-block, .case-strip, .example-block, .assessment-section, .expert-intro, .expert-form, .tracking-panel, .public-qa-section { padding: 26px 28px; background: white; border: 1px solid var(--line); border-radius: var(--radius); box-shadow: 0 7px 25px rgba(8,47,87,.05); }
.lesson-block h2, .case-strip h2, .example-block h2, .assessment-section h2, .expert-intro h2, .expert-form h2, .tracking-panel h2, .public-qa-section h2 { margin: 5px 0 11px; color: var(--navy); line-height: 1.25; }
.lesson-block p, .case-strip p, .example-block p, .expert-intro p { margin: 0; }
.lesson-block--pain { border-left: 6px solid var(--red); background: linear-gradient(110deg,#fff 55%,#fff8f6); }
.lesson-block--pain .section-kicker { color: var(--red); }
.principle-list { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 10px; padding: 0; list-style: none; }
.principle-list li { position: relative; margin: 0; padding: 13px 15px 13px 42px; background: #f5f8fa; border-radius: 9px; }
.principle-list li::before { content: "✓"; position: absolute; left: 14px; top: 12px; color: var(--green); font-weight: 900; }
.method-steps { display: grid; gap: 9px; margin: 13px 0 0; padding: 0; list-style: none; }
.method-steps li { display: grid; grid-template-columns: 35px 1fr; gap: 12px; align-items: center; padding: 11px 13px; border: 1px solid #dde5ec; border-radius: 9px; }
.method-steps b { width: 31px; height: 31px; display: grid; place-items: center; color: white; background: var(--navy); border-radius: 50%; }
.decision-rule { display: grid; gap: 5px; padding: 21px 25px; color: white; background: var(--navy); border-left: 8px solid var(--gold); border-radius: 12px; }
.decision-rule span { color: #f1d48f; font-size: .75rem; font-weight: 800; letter-spacing: .1em; }
.decision-rule strong { font-size: 1.15rem; line-height: 1.45; }
.case-strip { display: grid; grid-template-columns: minmax(240px,.7fr) 1.3fr; gap: 25px; align-items: center; border-left: 6px solid var(--blue); }
.example-block { border-top: 6px solid var(--gold); }
.example-block ul { margin-bottom: 0; }
.instructor-note { padding: 17px 21px; border: 1px solid #bfd9e9; border-left: 6px solid var(--blue); border-radius: 11px; background: var(--blue-soft); }
.instructor-note span { color: var(--blue); font-size: .75rem; font-weight: 900; letter-spacing: .1em; }
.instructor-note p { margin: 5px 0 0; color: var(--navy); font-weight: 700; }

.platform-matrix, .knowledge-cards { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 11px; margin-top: 14px; }
.platform-matrix article, .knowledge-cards article { min-height: 125px; padding: 16px; border: 1px solid #d5e0e8; border-top: 5px solid var(--blue); border-radius: 10px; background: #f8fafb; }
.platform-matrix article:nth-child(3), .knowledge-cards article:nth-child(3) { border-top-color: var(--gold); }
.platform-matrix article:nth-child(4) { border-top-color: var(--red); background: var(--red-soft); }
.platform-matrix article strong, .knowledge-cards article strong { display: block; color: var(--navy); }
.platform-matrix article p, .knowledge-cards article p { margin: 7px 0; color: var(--muted); font-size: .88rem; }
.platform-matrix article small, .knowledge-cards article small { color: var(--ink); font-size: .78rem; font-weight: 700; }
.platform-matrix article small { display: block; margin-top: 8px; line-height: 1.45; }
.platform-matrix article small.not-for { color: #7b2c25; }
.official-references { margin-top: 15px; padding: 13px 15px; border-left: 5px solid var(--gold); background: var(--gold-soft); }
.official-references summary { color: var(--navy); font-weight: 800; cursor: pointer; }
.official-references article { margin-top: 11px; padding-top: 10px; border-top: 1px solid #e8d3a5; }
.official-references p { margin: 3px 0; color: var(--muted); font-size: .84rem; }
.agency-definition { margin-top: 15px; padding: 18px 20px; color: white; background: linear-gradient(120deg,var(--navy),#0c568d); border-left: 7px solid var(--gold); border-radius: 11px; }
.agency-definition strong { font-size: 1.15rem; }
.agency-definition p { margin: 7px 0; }
.agency-definition ul { margin-bottom: 0; }

.assessment-section { border-top: 6px solid var(--gold); }
.assessment-state { flex: 0 0 auto; padding: 6px 10px; color: #76500d; background: var(--gold-soft); border-radius: 999px; font-size: .75rem; font-weight: 800; }
.assessment-form { display: grid; gap: 14px; margin-top: 17px; }
.assessment-question { min-width: 0; margin: 0; padding: 17px; border: 1px solid #d3dde6; border-radius: 11px; }
.assessment-question legend { width: 100%; padding: 0 5px; color: var(--navy); font-weight: 800; }
.assessment-question legend span { display: block; color: var(--blue); font-size: .75rem; letter-spacing: .07em; }
.assessment-choices { display: grid; gap: 8px; margin-top: 9px; }
.assessment-choices label { display: grid; grid-template-columns: 20px 31px 1fr; gap: 9px; align-items: start; padding: 11px; border: 1px solid #dce4eb; border-radius: 9px; cursor: pointer; }
.assessment-choices label:has(input:checked) { border-color: var(--blue); background: var(--blue-soft); }
.assessment-choices input { width: 18px; height: 18px; margin-top: 3px; accent-color: var(--blue); }
.assessment-choices b { width: 28px; height: 28px; display: grid; place-items: center; color: var(--navy); background: #e8eef3; border-radius: 50%; }
.answer-metadata { display: grid; grid-template-columns: minmax(0,1fr) 190px; gap: 11px; margin-top: 11px; }
.answer-metadata label, .expert-form label, .modal--issue label { display: grid; gap: 6px; color: var(--navy); font-size: .84rem; font-weight: 800; }
.answer-feedback { margin-top: 12px; padding: 13px 15px; color: #175d48; background: var(--green-soft); border-left: 5px solid var(--green); }
.answer-feedback.is-critical { color: #7a2b24; background: var(--red-soft); border-left-color: var(--red); }
.answer-feedback p { margin: 6px 0; }
.assessment-submit-row { display: flex; align-items: center; gap: 13px; }
.assessment-submit-row span { color: var(--muted); font-size: .82rem; }
.assessment-summary { margin-top: 14px; color: var(--muted); }
.score-card { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 5px 20px; padding: 17px 20px; color: white; background: var(--navy); border-left: 7px solid var(--gold); border-radius: 11px; }
.score-card span { color: #efd48f; font-size: .75rem; font-weight: 900; letter-spacing: .09em; }
.score-card strong { grid-row: span 2; font-size: 2.15rem; }
.score-card p { margin: 0; color: #dbe8f2; }
.demo-preparation { margin: 18px 0; padding: 18px; border: 1px solid #b9d6e7; border-left: 6px solid var(--blue); border-radius: 11px; background: #f3f8fb; }
.demo-preparation__heading span { color: var(--blue); font-size: .75rem; font-weight: 900; letter-spacing: .09em; }
.demo-preparation__heading p { margin: 4px 0 13px; color: var(--muted); font-size: .84rem; }
.demo-preparation__grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 11px; }
.demo-preparation__grid label { display: grid; gap: 6px; padding: 12px; border: 1px solid #d4e2eb; border-radius: 9px; background: white; }
.demo-preparation__grid b { color: var(--navy); font-size: .82rem; }
.demo-preparation__grid textarea { min-height: 86px; }

.expert-intro { display: grid; grid-template-columns: .8fr 1.2fr; gap: 24px; align-items: center; border-left: 6px solid var(--gold); }
.expert-grid { display: grid; grid-template-columns: minmax(0,1fr) minmax(0,1fr); gap: 16px; align-items: start; }
.expert-form { display: grid; gap: 13px; }
.expert-form h2 { margin-bottom: 0; }
.consent-line { display: grid !important; grid-template-columns: 20px 1fr !important; gap: 9px !important; align-items: start; }
.consent-line input { width: 18px; height: 18px; margin-top: 3px; accent-color: var(--blue); }
.consent-line span { color: var(--muted) !important; font-size: .8rem !important; font-weight: 500 !important; }
.form-warning { margin: 0; padding: 10px 12px; color: #7b3028; background: var(--red-soft); border-radius: 8px; font-size: .8rem; }
.tracking-panel { min-height: 300px; }
.button--small { min-height: 34px; padding: 5px 10px; font-size: .76rem; }
.tracking-card { margin-top: 10px; padding: 14px; border: 1px solid #d7e0e8; border-radius: 9px; background: #fafbfc; }
.tracking-card > div { display: flex; justify-content: space-between; gap: 12px; }
.tracking-card > div span { color: var(--blue); font-size: .75rem; font-weight: 900; }
.tracking-card > div em { color: var(--green); font-size: .75rem; font-style: normal; font-weight: 800; }
.tracking-card > strong { display: block; margin-top: 6px; color: var(--navy); }
.tracking-card p { margin: 5px 0; color: var(--muted); font-size: .86rem; }
.tracking-card aside { margin-top: 9px; padding: 10px; background: var(--green-soft); }
.tracking-card small { display: block; margin-top: 8px; color: var(--muted); }
.empty-state { padding: 25px 15px; color: var(--muted); background: #f7f9fb; border: 1px dashed #cbd7e1; border-radius: 9px; text-align: center; }
.public-qa { margin-top: 9px; border: 1px solid #d6e0e8; border-radius: 9px; background: white; }
.public-qa summary { padding: 13px 15px; color: var(--navy); font-weight: 800; cursor: pointer; }
.public-qa > div { padding: 0 15px 14px; }
.public-qa p { margin: 0 0 9px; }
.public-qa small { display: block; color: var(--muted); }

.form-grid { display: grid; gap: 12px; }
.form-grid--two { grid-template-columns: repeat(2,minmax(0,1fr)); }
.form-grid--three { grid-template-columns: repeat(3,minmax(0,1fr)); }
.privacy-brief { margin-top: 15px; padding: 12px 14px; color: #294158; background: #f1f6fa; border: 1px solid #d4e2ec; border-left: 5px solid var(--blue); border-radius: 8px; }
.privacy-brief strong { color: var(--navy); }
.privacy-brief p { margin: 4px 0 0; font-size: .8rem; line-height: 1.45; }
.modal--issue form { padding: 28px; }
.report-issue-button { position: fixed; z-index: 28; right: 20px; bottom: 20px; display: inline-flex; align-items: center; gap: 8px; padding: 10px 15px; color: white; background: var(--red); border: 2px solid white; border-radius: 999px; box-shadow: 0 8px 26px rgba(109,27,20,.25); font-weight: 800; }
.report-issue-button span { width: 21px; height: 21px; display: grid; place-items: center; color: var(--red); background: white; border-radius: 50%; }

@media (max-width: 1120px) {
  .learning-clocks > div { min-width: 95px; padding-inline: 8px; }
  .chapter-nav--horizontal .chapter-link { grid-template-columns: 30px 1fr; }
  .chapter-nav--horizontal .chapter-link em { display: none; }
  .chapter-nav--horizontal .chapter-link span small { display: none; }
  .chapter-tabs { top: 151px; }
}

@media (max-width: 760px) {
  .learning-topbar { position: static; }
  .learning-clocks { order: 3; width: 100%; border-top: 1px solid var(--line); padding-top: 7px; }
  .learning-clocks > div { flex: 1; min-width: 0; border-left: 0; padding: 3px 5px; }
  .learning-clocks > div + div { border-left: 1px solid var(--line); }
  .learning-clocks strong { font-size: 1rem; }
  .topbar-account .status-dot { display: none; }
  .course-progress { position: static; padding: 8px 12px; }
  .course-progress__summary { display: flex; justify-content: space-between; margin-bottom: 7px; color: var(--muted); font-size: .75rem; }
  .course-progress__summary strong { color: var(--navy); }
  .chapter-nav--horizontal { display: flex; overflow-x: auto; }
  .chapter-nav--horizontal .chapter-link { min-width: 132px; min-height: 50px; }
  .chapter-nav--horizontal .chapter-link span small { display: block; }
  .learning-shell { padding: 12px 12px 82px; }
  .learning-toolbar { align-items: flex-start; }
  .safety-reminder { max-width: 58%; text-align: right; }
  .chapter-view--v2 .chapter-hero { padding: 22px 19px; }
  .chapter-tabs { position: static; grid-template-columns: 1fr; }
  .chapter-tab { min-height: 52px; }
  .lesson-grid, .lesson-grid, .principle-list, .platform-matrix, .knowledge-cards, .expert-grid, .expert-intro, .case-strip, .form-grid--two, .form-grid--three, .demo-preparation__grid { grid-template-columns: 1fr; }
  .lesson-block, .case-strip, .example-block, .assessment-section, .expert-intro, .expert-form, .tracking-panel, .public-qa-section { padding: 20px 17px; }
  .answer-metadata { grid-template-columns: 1fr; }
  .assessment-submit-row { align-items: stretch; flex-direction: column; }
  .score-card { grid-template-columns: 1fr auto; }
  .report-issue-button { right: 12px; bottom: 12px; }
}

@media print {
  .course-progress, .learning-toolbar, .chapter-tabs, .report-issue-button { display: none !important; }
  .learning-shell { width: 100%; padding: 0; }
}

/* Teacher V2 */
.teacher-operation-strip { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 8px; margin-top: 13px; padding-top: 13px; border-top: 1px solid rgba(255,255,255,.18); }
.teacher-operation-strip > div { padding: 9px 12px; background: rgba(255,255,255,.08); border-radius: 8px; }
.teacher-operation-strip span, .teacher-operation-strip strong { display: block; }
.teacher-operation-strip span { color: #bed5e6; font-size: .75rem; font-weight: 800; letter-spacing: .08em; }
.teacher-operation-strip strong { margin-top: 2px; font-size: 1.25rem; }
.teacher-card-note { margin: 0 0 10px; color: var(--muted); font-size: .79rem; }
.teacher-broadcast-card > p { margin: 9px 0; color: var(--muted); font-size: .76rem; }
.teacher-broadcast-card .button { width: 100%; }
.teacher-public-qa { display: grid; gap: 8px; max-height: 410px; overflow: auto; }
.teacher-qa-item { padding: 11px; border: 1px solid var(--line); border-left: 4px solid var(--blue); border-radius: 8px; background: #f9fbfc; }
.teacher-qa-item.is-featured { border-left-color: var(--gold); background: var(--gold-soft); }
.teacher-qa-item > span, .teacher-qa-item > strong, .teacher-qa-item > p { display: block; }
.teacher-qa-item > span { color: var(--blue); font-size: .75rem; font-weight: 900; letter-spacing: .07em; }
.teacher-qa-item > strong { margin-top: 5px; color: var(--navy); }
.teacher-qa-item > p { margin: 5px 0 9px; color: var(--muted); font-size: .79rem; }

/* Presentation V2 */
.present-assessment-wait, .present-assessment-result, .featured-qa-view { height: 100%; display: flex; flex-direction: column; justify-content: center; }
.present-assessment-wait h1, .present-assessment-result h1, .featured-qa-view h1 { max-width: 1050px; margin: 10px 0 28px; color: var(--navy); font-size: clamp(2.2rem,4vw,4rem); line-height: 1.08; }
.projection-metrics--three { grid-template-columns: repeat(3,minmax(0,1fr)); }
.present-question-results { display: grid; gap: 8px; margin-top: 18px; }
.present-question-results article { display: grid; grid-template-columns: 75px 1fr 110px; gap: 12px; align-items: center; padding: 11px 15px; border: 1px solid var(--line); border-left: 5px solid var(--blue); }
.present-question-results b { color: var(--blue); }
.present-question-results span { color: var(--navy); font-weight: 700; }
.present-question-results strong { color: var(--green); font-size: 1.4rem; text-align: right; }
.featured-qa-view { padding: 1.5vw; }
.featured-qa-answer { padding: 24px 27px; color: white; background: var(--navy); border-left: 8px solid var(--gold); }
.featured-qa-answer span { color: #efd188; font-size: .8rem; font-weight: 900; letter-spacing: .1em; }
.featured-qa-answer p { margin: 8px 0 0; font-size: clamp(1.25rem,1.75vw,1.8rem); line-height: 1.45; }
.featured-qa-meta { margin-top: 12px; padding: 12px 17px; background: #f4f7f9; border-left: 5px solid var(--blue); }
.featured-qa-meta p { margin: 4px 0 0; }

/* Secretariat and expert workbench */
.staff-page { background: #edf2f6; }
.staff-topbar { position: sticky; }
.staff-identity { margin-left: auto; padding: 5px 14px; border-left: 1px solid var(--line); }
.staff-identity span, .staff-identity strong { display: block; }
.staff-identity span { color: var(--blue); font-size: .75rem; font-weight: 900; letter-spacing: .09em; }
.staff-identity strong { color: var(--navy); }
.staff-shell { width: min(1580px,100%); margin: 0 auto; padding: 20px; }
.staff-summary { display: grid; grid-template-columns: repeat(5,minmax(0,1fr)); gap: 10px; }
.staff-summary article { padding: 16px 18px; background: white; border: 1px solid var(--line); border-top: 5px solid var(--blue); border-radius: 11px; box-shadow: 0 6px 20px rgba(8,47,87,.05); }
.staff-summary article:nth-child(3) { border-top-color: var(--gold); }
.staff-summary article:nth-child(4) { border-top-color: var(--red); }
.staff-summary article:nth-child(5) { border-top-color: var(--green); }
.staff-summary span, .staff-summary strong, .staff-summary small { display: block; }
.staff-summary span { color: var(--muted); font-size: .75rem; font-weight: 900; letter-spacing: .08em; }
.staff-summary strong { color: var(--navy); font-size: 1.8rem; line-height: 1.15; }
.staff-summary small { color: var(--muted); }
.staff-notice { display: grid; grid-template-columns: minmax(240px,.65fr) 1.35fr; gap: 20px; align-items: center; margin-top: 12px; padding: 13px 18px; color: #23445f; background: var(--blue-soft); border: 1px solid #bad8ea; border-left: 6px solid var(--blue); border-radius: 10px; }
.staff-notice strong { color: var(--navy); }
.staff-notice p { margin: 0; font-size: .85rem; }
.staff-tabs { display: flex; gap: 8px; margin-top: 16px; }
.staff-tabs button { display: inline-flex; align-items: center; gap: 9px; padding: 10px 14px; border: 1px solid var(--line); border-radius: 9px 9px 0 0; background: #f7f9fb; color: var(--navy); font-weight: 800; }
.staff-tabs button b { min-width: 25px; padding: 2px 7px; color: white; background: #5d6b7d; border-radius: 999px; font-size: .75rem; }
.staff-tabs button.is-active { background: white; border-bottom-color: white; }
.staff-tabs button.is-active b { background: var(--blue); }
.staff-workspace { min-height: 660px; display: grid; grid-template-columns: 410px minmax(0,1fr); border: 1px solid var(--line); background: white; box-shadow: var(--shadow); }
.staff-queue { min-width: 0; padding: 16px; border-right: 1px solid var(--line); background: #f7f9fb; }
.staff-queue-controls { display: grid; grid-template-columns: 1fr 145px; gap: 8px; }
.staff-queue-controls label { display: grid; gap: 4px; color: var(--navy); font-size: .75rem; font-weight: 800; }
.staff-queue-controls .button { grid-column: span 2; min-height: 35px; }
.staff-queue-list { display: grid; gap: 7px; max-height: 730px; margin-top: 12px; overflow: auto; }
.staff-queue-item { width: 100%; padding: 12px; border: 1px solid #d7e0e7; border-radius: 9px; background: white; text-align: left; }
.staff-queue-item:hover, .staff-queue-item.is-active { border-color: var(--blue); background: var(--blue-soft); }
.staff-queue-item > div { display: flex; justify-content: space-between; gap: 10px; }
.staff-queue-item b { color: var(--blue); font-size: .75rem; }
.staff-queue-item em { color: var(--green); font-size: .75rem; font-style: normal; font-weight: 800; }
.staff-queue-item > strong, .staff-queue-item > small { display: block; }
.staff-queue-item > strong { margin-top: 5px; color: var(--navy); line-height: 1.3; }
.staff-queue-item > small { margin-top: 4px; color: var(--muted); }
.staff-detail { min-width: 0; padding: 22px; }
.empty-detail { min-height: 500px; display: grid; place-items: center; align-content: center; color: var(--muted); text-align: center; }
.empty-detail span { color: var(--blue); font-size: .75rem; font-weight: 900; letter-spacing: .1em; }
.empty-detail h1 { margin: 7px 0; color: var(--navy); }
.staff-record-form { display: grid; gap: 14px; }
.record-head { display: flex; justify-content: space-between; gap: 20px; align-items: flex-start; padding-bottom: 15px; border-bottom: 1px solid var(--line); }
.record-head span { color: var(--blue); font-size: .75rem; font-weight: 900; letter-spacing: .08em; }
.record-head h1 { margin: 4px 0 0; color: var(--navy); font-size: 1.65rem; line-height: 1.22; }
.record-head em { flex: 0 0 auto; padding: 6px 10px; color: var(--green); background: var(--green-soft); border-radius: 999px; font-size: .75rem; font-style: normal; font-weight: 800; }
.record-meta { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 8px; }
.record-meta > div { padding: 9px 11px; background: #f4f7f9; border-radius: 7px; }
.record-meta span, .record-meta strong { display: block; }
.record-meta span { color: var(--muted); font-size: .75rem; font-weight: 800; letter-spacing: .06em; }
.record-meta strong { color: var(--navy); font-size: .83rem; }
.record-section { display: grid; gap: 11px; padding: 17px; border: 1px solid var(--line); border-radius: 10px; }
.record-section > span { color: var(--blue); font-size: .75rem; font-weight: 900; letter-spacing: .09em; }
.record-section p { margin: 0; white-space: pre-wrap; }
.record-section label { display: grid; gap: 5px; color: var(--navy); font-size: .78rem; font-weight: 800; }
.record-section--sensitive { border-left: 6px solid var(--red); background: var(--red-soft); }
.record-section--sensitive > span { color: var(--red); }
.record-section--answer { border-left: 6px solid var(--green); }
.record-actions { position: sticky; bottom: 0; z-index: 3; display: flex; flex-wrap: wrap; gap: 8px; padding: 13px; background: rgba(255,255,255,.96); border: 1px solid var(--line); box-shadow: 0 -7px 20px rgba(8,47,87,.06); }
.offline-mail-warning { padding: 16px 18px; color: #6e4b07; background: var(--gold-soft); border-left: 6px solid var(--gold); }
.offline-mail-warning p { margin: 4px 0 0; }

@media (max-width: 1100px) {
  .staff-summary { grid-template-columns: repeat(3,minmax(0,1fr)); }
  .staff-workspace { grid-template-columns: 340px minmax(0,1fr); }
  .teacher-operation-strip { grid-template-columns: repeat(2,minmax(0,1fr)); }
}

@media (max-width: 760px) {
  .staff-topbar { position: static; }
  .staff-identity { margin-left: 0; }
  .staff-shell { padding: 12px; }
  .staff-summary { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .staff-notice { grid-template-columns: 1fr; gap: 5px; }
  .staff-tabs { overflow-x: auto; }
  .staff-tabs button { min-width: max-content; }
  .staff-workspace { grid-template-columns: 1fr; }
  .staff-queue { border-right: 0; border-bottom: 1px solid var(--line); }
  .staff-queue-list { max-height: 340px; }
  .staff-detail { padding: 16px; }
  .record-meta { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .record-actions { position: static; }
  .projection-metrics--three { grid-template-columns: 1fr; }
}

/* Compact control surfaces: learner phones, a laptop companion window, or emergency mobile operation. */
@media (max-width: 760px) {
  .join-anonymous-top { display: inline-flex; width: 100%; margin: 12px 0 4px; }
  .identity-chip, .button--small, .card-title button { min-height: 44px; }
  .follow-toggle, .source-check, .assessment-choices label { min-height: 44px; }

  .teacher-topbar, .staff-topbar {
    position: static;
    display: grid;
    grid-template-columns: minmax(0,1fr);
    align-items: start;
    gap: 10px;
    padding: 11px 12px;
  }
  .teacher-topbar .brand, .staff-topbar .brand { width: 100%; min-width: 0; }
  .teacher-topbar .brand strong, .staff-topbar .brand strong { font-size: .82rem; }
  .teacher-live {
    width: 100%;
    margin-left: 0;
    display: grid;
    grid-template-columns: minmax(108px,1fr) repeat(2,minmax(82px,auto));
    align-items: center;
    gap: 8px;
    padding: 8px 0;
    border-block: 1px solid var(--line);
  }
  .teacher-live .live-status { line-height: 1.25; }
  .teacher-top-actions {
    width: 100%;
    display: grid;
    grid-template-columns: repeat(auto-fit,minmax(104px,1fr));
    gap: 8px;
  }
  .teacher-top-actions .button { width: 100%; min-width: 0; padding-inline: 8px; }
  .staff-identity {
    width: 100%;
    margin-left: 0;
    padding: 8px 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    border-left: 0;
    border-block: 1px solid var(--line);
  }

  .teacher-shell { padding: 12px; }
  .control-room { padding: 14px; }
  .control-summary { grid-template-columns: repeat(2,minmax(0,1fr)); gap: 7px; }
  .control-summary > div { min-width: 0; padding: 9px 10px; }
  .main-controls, .quiz-controls { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); align-items: stretch; }
  .main-controls .button, .quiz-controls .button { width: 100%; min-width: 0; }
  .quiz-controls span { grid-column: 1 / -1; margin-left: 0; text-align: left; }
  .teacher-chapters { display: flex; overflow-x: auto; padding-bottom: 5px; scroll-snap-type: x proximity; }
  .teacher-chapters button { flex: 0 0 132px; scroll-snap-align: start; }
  .script-panel__head { flex-wrap: wrap; padding: 18px; }
  .script-block { padding: 18px; }
  .script-footer { align-items: flex-start; flex-direction: column; gap: 8px; padding: 13px 18px; }

  .staff-queue-controls { grid-template-columns: 1fr; }
  .staff-queue-controls .button { grid-column: 1; min-height: 44px; }

  .present-page { height: auto; min-height: 100vh; overflow: auto; }
  .present-header {
    height: auto;
    min-height: 0;
    display: grid;
    grid-template-columns: minmax(0,1fr) 44px;
    align-items: center;
    gap: 9px;
    padding: 10px 12px;
  }
  .present-header .brand { grid-column: 1; grid-row: 1; min-width: 0; }
  .present-header .brand strong { font-size: .78rem; }
  .present-header #fullscreen { grid-column: 2; grid-row: 1; }
  .present-clocks {
    grid-column: 1 / -1;
    grid-row: 2;
    width: 100%;
    margin-left: 0;
    display: grid;
    grid-template-columns: minmax(105px,1fr) repeat(2,minmax(76px,auto));
    align-items: center;
    gap: 8px;
    padding-top: 8px;
    border-top: 1px solid var(--line);
  }
  .present-clocks .live-status { line-height: 1.25; }
  .present-shell { height: auto; min-height: 0; grid-template-columns: minmax(0,1fr); gap: 12px; padding: 12px; }
  .present-content { order: 1; min-height: 680px; overflow: visible; padding: 22px 18px; }
  .present-side { order: 2; }
  .qr-panel img { width: min(230px,100%); }
  .projection-cover h1 { font-size: clamp(2.25rem,12vw,3.2rem); }
  .projection-columns, .projection-before-after, .projection-table, .projection-metrics { grid-template-columns: 1fr; }
  .projection-body { overflow: visible; }
}

/* V2.1 — lớp học tinh gọn: một thao tác, một kết quả rõ ràng */
.inline-hint {
  margin: 12px 0; border: 1px solid #c7d9e7; border-left: 5px solid var(--blue);
  border-radius: 9px; background: #f2f7fb; color: #29445c;
}
.inline-hint summary {
  min-height: 44px; display: flex; align-items: center; padding: 9px 13px;
  color: var(--navy); font-weight: 800; cursor: pointer;
}
.inline-hint[open] summary { border-bottom: 1px solid #d7e4ed; }
.inline-hint > p, .inline-hint > div { margin: 0; padding: 11px 14px 13px; }
.inline-hint p { margin: 0; }
.inline-hint--compact { flex: 1 1 280px; margin: 0; }
.lesson-hint { background: var(--gold-soft); border-color: #e5cd94; border-left-color: var(--gold); }
.lesson-hint ul { margin-block: 0; }
.teacher-live-message {
  padding: 16px 20px; border: 1px solid #a9cee4; border-left: 7px solid var(--blue);
  border-radius: 11px; background: #eaf5fb; box-shadow: 0 7px 22px rgba(8,47,87,.06);
}
.teacher-live-message span { color: var(--blue); font-size: .75rem; font-weight: 900; letter-spacing: .09em; }
.teacher-live-message p { margin: 5px 0 0; color: var(--navy); font-size: 1.05rem; font-weight: 700; }

.assessment-section--instant { border-top-color: var(--blue); }
.assessment-question__actions { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; margin-top: 12px; }
.assessment-question__actions > .button { flex: 0 0 auto; }
.instant-feedback-note { align-self: center; color: var(--green); font-size: .82rem; font-weight: 800; }
.assessment-question.is-answer-aligned { border-color: #8bcbb6; }
.assessment-question.is-answer-review { border-color: #e4bf79; }
.answer-feedback.is-correct { color: #175d48; background: var(--green-soft); border-left-color: var(--green); }
.answer-feedback.is-critical { color: #6d4b09; background: var(--gold-soft); border-left-color: var(--gold); }
.file-drop { padding: 14px; border: 1px dashed #8fb5cf; border-radius: 10px; background: #f7fafc; }
.file-drop span { color: var(--muted); font-size: .76rem; font-weight: 500; }
.file-drop input { margin-top: 4px; background: white; }
.file-drop small { color: var(--muted); font-weight: 500; overflow-wrap: anywhere; }
.safety-confirm { display: grid !important; grid-template-columns: 22px minmax(0,1fr); gap: 9px !important; align-items: start; padding: 12px 13px; border: 1px solid #d8bd78; border-radius: 9px; background: var(--gold-soft); }
.safety-confirm input { width: 19px; height: 19px; margin-top: 2px; accent-color: var(--navy); }
.safety-confirm span { color: #5d430e; font-size: .84rem; font-weight: 700; }
.form-status { min-height: 24px; margin: 0; color: var(--green); font-weight: 700; }
.simple-note { color: var(--muted); font-size: .84rem; }
.expert-grid--simple { grid-template-columns: minmax(0,1.2fr) minmax(300px,.8fr); }
.expert-grid--single { display: block; }
.expert-grid--single .expert-form { width: min(820px,100%); margin-inline: auto; }

.teacher-operation-strip { grid-template-columns: repeat(3,minmax(0,1fr)); }
.teacher-chapters .teacher-chapter-step {
  min-height: 48px; display: flex; gap: 8px; align-items: center; padding: 8px 10px;
  border: 1px solid rgba(255,255,255,.28); border-radius: 8px; color: white; background: rgba(255,255,255,.07);
}
.teacher-chapters .teacher-chapter-step b {
  width: 26px; height: 26px; display: grid; place-items: center; flex: 0 0 auto;
  border-radius: 50%; background: rgba(255,255,255,.18);
}
.teacher-chapters .teacher-chapter-step.is-active { color: var(--navy); background: #f4d88f; border-color: #f4d88f; }
.teacher-chapters .teacher-chapter-step.is-done { background: rgba(234,247,242,.17); }
.teaching-tip-toggle { margin: 14px 22px 0; }
.collapsible-card { display: block; }
.collapsible-card > summary { min-height: 44px; display: flex; align-items: center; color: var(--navy); font-weight: 800; cursor: pointer; }
.collapsible-card[open] > summary { margin-bottom: 8px; border-bottom: 1px solid var(--line); }
.hint-actions { display: grid; gap: 7px; }
.hint-actions button { min-height: 40px; padding: 8px 10px; border: 1px solid #a9c7da; border-radius: 8px; color: var(--navy); background: white; text-align: left; font-weight: 700; }

/* Tổ giúp việc V2.1 */
.support-live { margin-left: auto; display: flex; align-items: center; gap: 15px; }
.support-live > span { display: grid; line-height: 1.15; }
.support-live small { color: var(--muted); font-size: .72rem; font-weight: 800; text-transform: uppercase; }
.support-live strong { color: var(--navy); font-variant-numeric: tabular-nums; }
.support-shell { width: min(1500px,100%); margin: 0 auto; padding: 20px; }
.support-now { display: grid; grid-template-columns: minmax(0,1fr) 300px; gap: 20px; align-items: center; margin-bottom: 10px; padding: 16px 19px; color: white; background: var(--navy); border-left: 7px solid var(--gold); border-radius: 11px; }
.support-now span { color: #efd48f; font-size: .74rem; font-weight: 900; letter-spacing: .08em; }
.support-now h1 { margin: 4px 0 0; font-size: 1.25rem; line-height: 1.3; }
.support-progress { height: 10px; overflow: hidden; border-radius: 999px; background: rgba(255,255,255,.2); }
.support-progress i { display: block; width: 0; height: 100%; background: #f1cb75; transition: width .35s ease; }
.support-overview { display: grid; grid-template-columns: repeat(5,minmax(0,1fr)); gap: 10px; }
.support-overview article { min-width: 0; padding: 15px 17px; border: 1px solid var(--line); border-top: 5px solid var(--blue); border-radius: 11px; background: white; box-shadow: 0 6px 20px rgba(8,47,87,.05); }
.support-overview article:nth-child(3) { border-top-color: var(--gold); }
.support-overview article:nth-child(4) { border-top-color: var(--red); }
.support-overview article:nth-child(5) { border-top-color: var(--green); }
.support-overview span, .support-overview strong, .support-overview small { display: block; }
.support-overview span { color: var(--muted); font-size: .74rem; font-weight: 900; letter-spacing: .06em; }
.support-overview strong { color: var(--navy); font-size: 1.75rem; line-height: 1.2; }
.support-overview small { color: var(--muted); }
.support-actions { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-top: 13px; padding: 18px 20px; border: 1px solid var(--line); border-left: 6px solid var(--blue); border-radius: 11px; background: white; }
.support-actions h1 { margin: 3px 0; color: var(--navy); font-size: 1.35rem; }
.support-actions p { margin: 0; color: var(--muted); }
.support-actions > div:last-child { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 8px; }
.support-secondary-link { min-height: 40px; padding: 7px 3px; border: 0; color: var(--blue); background: transparent; font-weight: 800; text-decoration: underline; text-underline-offset: 3px; }
.support-hint { margin-block: 12px; }
.support-tabs { margin-top: 12px; }
.support-workspace { min-width: 0; min-height: 540px; padding: 18px; border: 1px solid var(--line); border-radius: 0 11px 11px 11px; background: white; box-shadow: var(--shadow); }
.support-filters { display: grid; grid-template-columns: minmax(0,1fr) 200px; gap: 10px; margin-bottom: 15px; padding-bottom: 15px; border-bottom: 1px solid var(--line); }
.support-filters label { display: grid; gap: 5px; color: var(--navy); font-size: .8rem; font-weight: 800; }
.support-content { min-width: 0; }
.support-records { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 12px; }
.support-record { min-width: 0; padding: 16px; border: 1px solid #d7e1e9; border-left: 5px solid var(--blue); border-radius: 10px; background: #fbfcfd; }
.support-record--issue { border-left-color: var(--red); }
.support-record header { display: flex; align-items: flex-start; justify-content: space-between; gap: 14px; }
.support-record header > div { min-width: 0; }
.support-record header span { color: var(--blue); font-size: .73rem; font-weight: 900; letter-spacing: .07em; }
.support-record h2 { margin: 3px 0 0; color: var(--navy); font-size: 1.02rem; line-height: 1.3; overflow-wrap: anywhere; }
.support-record header small { flex: 0 0 auto; color: var(--muted); }
.support-record__meta { margin-top: 8px; color: var(--muted); font-size: .8rem; }
.support-record > p { white-space: pre-wrap; overflow-wrap: anywhere; }
.support-files { display: grid; gap: 7px; margin-top: 11px; }
.support-file { min-width: 0; display: grid; grid-template-columns: 24px minmax(0,1fr) auto; gap: 8px; align-items: center; padding: 9px 11px; border: 1px solid #bdd4e3; border-radius: 8px; color: var(--navy); background: var(--blue-soft); }
.support-file b { overflow-wrap: anywhere; }
.support-file small { color: var(--muted); }
.support-stats { min-width: 760px; border: 1px solid var(--line); border-radius: 9px; overflow: hidden; }
.support-content:has(.support-stats) { overflow-x: auto; }
.support-stats > div { display: grid; grid-template-columns: 90px repeat(4,minmax(90px,1fr)) minmax(150px,1.4fr); }
.support-stats > div > * { padding: 12px; border-top: 1px solid var(--line); }
.support-stats__head { color: white; background: var(--navy); font-size: .78rem; font-weight: 800; }
.support-stats__head > * { border-top: 0 !important; }

@media (max-width: 1100px) {
  .support-overview { grid-template-columns: repeat(3,minmax(0,1fr)); }
  .support-records { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  .assessment-question__actions { flex-direction: column; }
  .assessment-question__actions > * { width: 100%; }
  .expert-grid--simple { grid-template-columns: 1fr; }
  .teacher-chapters .teacher-chapter-step { flex: 0 0 128px; scroll-snap-align: start; }
  .teaching-tip-toggle { width: calc(100% - 36px); margin-inline: 18px; }
  .support-live { width: 100%; margin-left: 0; display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 7px; padding-block: 8px; border-block: 1px solid var(--line); }
  .support-live > span { min-width: 0; }
  .support-shell { padding: 12px; }
  .support-now { grid-template-columns: 1fr; gap: 11px; }
  .support-overview { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .support-overview article { padding: 12px; }
  .support-actions { align-items: stretch; flex-direction: column; padding: 15px; }
  .support-actions > div:last-child { display: grid; grid-template-columns: 1fr; justify-content: stretch; }
  .support-tabs { overflow-x: auto; }
  .support-tabs button { flex: 0 0 auto; }
  .support-workspace { padding: 12px; }
  .support-filters { grid-template-columns: 1fr; }
  .support-record header { flex-direction: column; gap: 4px; }
  .support-file { grid-template-columns: 24px minmax(0,1fr); }
  .support-file small { grid-column: 2; }
}