/* Student-only theme. All teacher views retain their existing layout. */
body.student-mode{--ink:#192444;--muted:#52617b;--card:#fff;--line:#dce3f4;--green:#5145c7;--pale:#eef0ff;background:linear-gradient(135deg,#a9edf0 0%,#689fe9 35%,#5867dc 68%,#7051d2 100%);background-attachment:fixed;color:var(--ink);min-height:100vh;min-height:100dvh}
.student-mode .shell{display:block;max-width:1000px;margin:auto;padding:20px max(16px,env(safe-area-inset-right)) 24px max(16px,env(safe-area-inset-left))}
.learner-brand{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:22px;padding:15px 20px;background:#fffffff0;border:1px solid #ffffffaa;border-radius:22px;box-shadow:0 8px 30px #29396716;position:relative;z-index:8}
.learner-brand>span{font-size:22px;font-weight:800;letter-spacing:-.6px;color:#393092}.learner-brand small{display:block;font-size:12px;font-weight:500;letter-spacing:1px;color:#657290;margin-top:2px}
.learner-menu>summary{padding:12px;font-size:14px;min-height:44px}.learner-menu .sidebar{position:absolute;right:0;top:100%;width:min(330px,90vw);height:auto;max-height:75dvh;overflow:auto;border-radius:20px;box-shadow:0 16px 45px #17244440;display:block;padding:20px}.learner-menu .sidebar .brand{display:none}.learner-menu .sidebar .bottom{margin-top:12px}.learner-menu .sidebar button{display:block;width:100%;text-align:left}.learner-menu .sidebar select{width:100%;max-width:none}
.student-mode .main{padding:0;min-width:0}.student-mode .topline{display:none}.student-mode .hero{padding:12px 6px;margin-bottom:24px;color:#18204c}.student-mode .hero h1{font-size:clamp(27px,5vw,40px)}.student-mode .hero p{color:#25365c;max-width:600px}.student-mode .hero-art{display:none}
.student-mode .card{border:1px solid #ffffffad;border-radius:24px;box-shadow:0 12px 34px #27377717;background:var(--card)}.student-mode button{border-radius:14px;min-height:48px;padding:12px 18px;font-weight:650;touch-action:manipulation;color:var(--ink);background:#fff;border:1px solid #d9e0ef}.student-mode button.primary{background:linear-gradient(110deg,#475cce,#6a42c8);color:#fff;border:1px solid #5047c4;box-shadow:0 5px 15px #4b3fac20}.student-mode button:disabled{background:#e9edf5;color:#66728a;box-shadow:none;opacity:1;cursor:default}
.student-mode input,.student-mode textarea,.student-mode select{font-size:17px;border-radius:14px;border:1px solid #bac6df;background:#fff;color:#192444;min-height:48px;line-height:1.5}.student-mode textarea{min-height:160px;resize:vertical}.student-mode :is(button,a,input,textarea,select,summary):focus-visible{outline:3px solid #3b42ae;outline-offset:3px}
.learner-work{background:linear-gradient(145deg,#f7fcfff5,#f5f2fff5);padding:24px;border:1px solid #ffffffa6;border-radius:28px;box-shadow:0 16px 50px #242d6d24}
.learner-toolbar{display:flex;justify-content:space-between;gap:10px;margin-bottom:18px}.learner-toolbar button{font-size:14px;padding:10px 13px}.learner-intro h1{font-size:clamp(21px,3vw,29px);line-height:1.25;letter-spacing:-.5px;margin:12px 0}.learner-intro p{font-size:15px;margin:10px 0}.learner-intro .tag{background:#e5e8ff;color:#424399}.learner-extras{font-size:14px;border-bottom:1px solid #dde3f0;padding-bottom:8px}.learner-extras summary{padding:10px 0;color:#52617b}
.learner-progress{margin:14px 0 20px}.learner-progress-text{font-weight:700;font-size:14px;color:#36445f;margin:8px 0}.learner-progress .progress{height:8px;background:#dfe5f3;border-radius:10px;overflow:hidden;margin:10px 0}.learner-progress .progress>div{background:linear-gradient(90deg,#5065d4,#7760d8,#42a49a);height:100%;transition:width .18s ease}.learner-progress [role=status]{font-size:13px;margin:8px 0;overflow-wrap:anywhere}.learner-question-list summary{font-size:14px;color:#414d70;min-height:44px}.learner-question-list .question-nav{display:flex;flex-wrap:wrap;gap:8px;padding:8px 0}.learner-question-list button{width:48px;min-height:48px;padding:8px;font-size:16px}.learner-question-list button.answered{background:#e1f2ed;color:#215c50}.learner-question-list button.current{outline:3px solid #6551c7;outline-offset:1px}.learner-question-list button.answered:after{content:' ✓';font-size:12px}
.student-mode .learner-layout{display:block;min-width:0}.student-mode .question{margin:0;padding:24px;border-radius:24px;min-width:0;scroll-margin-top:12px}.student-mode .question h2{font-size:clamp(23px,3.4vw,32px);line-height:1.35;margin:18px 0 22px;letter-spacing:-.4px;overflow-wrap:anywhere}.student-mode .question>.tag{font-size:12px;margin-right:6px;background:#eef0f8;color:#465472}.student-mode .question .option{display:flex;align-items:center;gap:14px;min-height:64px;padding:16px 18px;margin:12px 0;border:2px solid #e4e7f2;border-radius:18px;background:#fff;box-shadow:0 5px 14px #2938670b;font-size:18px;font-weight:600;line-height:1.45;cursor:pointer;overflow-wrap:anywhere}.student-mode .question .option:has(input:checked){border-color:#6550ce;background:#f0edff;box-shadow:0 4px 14px #6550ce18}.student-mode .option input[type=radio],.student-mode .option input[type=checkbox]{flex:0 0 24px;width:24px;height:24px;min-height:24px;accent-color:#6650cf;margin:0}.student-mode .question input:disabled,.student-mode .question textarea:disabled,.student-mode .question select:disabled{opacity:1;color:#465472;background:#f3f5fa}.student-mode .order-row{border-radius:14px;gap:8px}.student-mode .order-row button{min-width:48px}.student-mode .pair-row{gap:12px;margin-bottom:14px}.student-mode .pair-row select{max-width:100%;min-width:0}.student-mode .question .notice{border-radius:14px}
.learner-instruction,.learner-char-count{font-size:13px;color:#52617b;margin:10px 0}.learner-char-count{text-align:right;font-variant-numeric:tabular-nums}
.learner-step-actions{position:sticky;bottom:0;display:grid;grid-template-columns:1fr 1fr;gap:12px;background:#fffffff5;padding:16px 0 max(12px,env(safe-area-inset-bottom));margin-top:24px;border-top:1px solid #e5e9f2;z-index:3}.learner-step-actions button{min-height:54px}.learner-save-actions{display:flex;justify-content:flex-end;gap:10px;flex-wrap:wrap;margin-top:16px}.learner-save-actions button{font-size:14px}.student-mode .modal{border-radius:24px;border:1px solid #d7def0}.student-mode .modal::backdrop{background:#18204780}
.student-mode.quiz-focus .learner-brand,.student-mode.quiz-focus .learner-extras,.student-mode.quiz-focus .learner-intro>p{display:none}.student-mode.quiz-focus .shell{max-width:1040px;padding-top:max(10px,env(safe-area-inset-top))}.student-mode.quiz-focus .learner-work{min-height:calc(100dvh - 30px)}.student-mode.quiz-focus .learner-intro h1{font-size:18px}.student-mode.quiz-focus .learner-progress{margin:10px 0}.student-mode.quiz-focus .question{min-height:45dvh}.student-mode.keyboard-open .learner-step-actions{position:static}.student-mode.keyboard-open .learner-intro,.student-mode.keyboard-open .learner-extras{display:none}
.student-mode.dark{--ink:#edf0ff;--muted:#bbc5e0;--card:#202a48;--line:#47557a;--pale:#32375c;background:linear-gradient(140deg,#164156,#252e61,#49306b)}.student-mode.dark .learner-work{background:#18213bed}.student-mode.dark .learner-brand{background:#202a48}.student-mode.dark .learner-brand>span,.student-mode.dark .learner-brand small,.student-mode.dark .hero,.student-mode.dark .hero p,.student-mode.dark .learner-progress-text,.student-mode.dark .learner-question-list summary,.student-mode.dark .learner-extras summary,.student-mode.dark .learner-char-count,.student-mode.dark .learner-instruction{color:#dce4ff}.student-mode.dark .question .option{background:#26314f;color:#edf0ff;border-color:#46547a}.student-mode.dark .question .option:has(input:checked){background:#3a3362;border-color:#b7a3ff}.student-mode.dark .learner-step-actions{background:#202a48}.student-mode.dark .question{border-color:#46547a}.student-mode.dark .question :is(input,textarea,select){background:#172139;color:#edf0ff;border-color:#617194}.student-mode.dark button:not(.primary){background:#293653;color:#edf0ff;border-color:#566585}
@media(max-width:600px){.student-mode .shell{padding-top:max(10px,env(safe-area-inset-top));padding-left:max(10px,env(safe-area-inset-left));padding-right:max(10px,env(safe-area-inset-right))}.learner-brand{padding:10px 14px;margin-bottom:12px;border-radius:18px}.learner-work{padding:14px;border-radius:22px}.learner-toolbar{gap:8px;margin-bottom:12px}.learner-toolbar button{font-size:13px;padding:10px}.student-mode .question{padding:16px;border-radius:20px}.student-mode .question h2{font-size:24px}.student-mode .question .option{padding:14px 12px;min-height:64px;font-size:17px;gap:10px}.student-mode .pair-row{display:block}.student-mode .pair-row select{margin-top:8px}.learner-save-actions{justify-content:stretch}.learner-save-actions button{flex:1}.learner-step-actions{gap:8px}.student-mode .card{padding:20px}.student-mode .question{padding:16px}.learner-progress{margin-bottom:12px}.learner-progress [role=status]{font-size:12px}.learner-menu .sidebar .muted{display:block}}
@media(prefers-reduced-motion:reduce){.learner-progress .progress>div{transition:none}}
.student-mode[data-font=large] .question :is(input,textarea,select),.student-mode[data-font=large] .question .option{font-size:20px}.student-mode[data-font=extra] .question :is(input,textarea,select),.student-mode[data-font=extra] .question .option{font-size:23px}.student-mode[data-font=large] .question h2{font-size:29px}.student-mode[data-font=extra] .question h2{font-size:33px}
/* Match the user's EduScan reference: luminous radial blue backdrop and full-card choices. */
body.student-mode:not(.dark){background-image:radial-gradient(140% 160% at 0% 0%,#a5f3fc 0%,#22c1fd 18%,#2563eb 42%,#4f46e5 70%,#7c3aed 100%)}
.student-mode .hero{background:#fffffff0;border-radius:24px;padding:24px;border:1px solid #ffffffa8}
.student-mode .question{background-image:radial-gradient(circle at 0% 0%,#818cf81c,transparent 55%),radial-gradient(circle at 100% 100%,#38bdf815,transparent 55%)}
.student-mode .question .option{position:relative;justify-content:center;text-align:center;padding:18px 40px;min-height:70px;border:1px solid #e1e3ef;border-radius:20px;box-shadow:0 8px 20px #18223d15;transition:background .16s ease,box-shadow .16s ease}
.student-mode .question .option input[type=radio],.student-mode .question .option input[type=checkbox]{position:absolute;opacity:0;width:1px;height:1px;min-height:0;margin:0;pointer-events:none}
.student-mode .question .option:focus-within{outline:3px solid #3730a3;outline-offset:3px}
.student-mode .question .option:has(input:checked),.student-mode.dark .question .option:has(input:checked){background:linear-gradient(145deg,#4f46e5,#15803d);border-color:transparent;color:white;box-shadow:0 8px 22px #4f46e52b}
.student-mode .question .option:has(input:checked):after{content:'✓';position:absolute;right:16px;top:50%;transform:translateY(-50%);font-size:20px;font-weight:800;color:white}
.student-mode.dark .hero{background:#202a48}
.student-mode.quiz-focus .shell{max-width:none}.student-mode.quiz-focus .learner-work{background:#f7f8fdf5}.student-mode.dark.quiz-focus .learner-work{background:#18213bf5}
.student-mode.quiz-focus .question .option{font-size:clamp(18px,1.65vw,26px);min-height:clamp(68px,9dvh,88px);font-weight:650}.student-mode.quiz-focus .learner-step-actions button{min-height:clamp(56px,8dvh,76px);font-size:clamp(17px,1.5vw,22px)}
@media(prefers-reduced-motion:reduce){.student-mode .question .option{transition:none}}
@media print{body.student-mode{background:white!important}.student-mode .learner-brand{display:none!important}}

/* Always-visible question overview, including focus mode and narrow screens. */
.student-mode .learner-question-list .question-nav{display:flex;flex-wrap:wrap;gap:10px;padding:10px 4px}.student-mode .learner-question-list button{position:relative;flex:0 0 48px;width:48px;height:48px;min-height:48px;border-radius:50%;padding:0;background:#cdd1dc;color:#202a42;border:2px solid #bbc2d1;box-shadow:none;font-size:17px}.student-mode .learner-question-list button.answered{background:#dceee3;border-color:#b6dcc4;color:#1c4932}.student-mode .learner-question-list button.answered:after{position:absolute;right:0;bottom:-3px;content:"✓";background:#e6f5eb;border-radius:50%;font-size:12px;width:17px;height:17px;line-height:17px}.student-mode .learner-question-list button.current{outline:3px solid #6551c7;outline-offset:2px}.learner-nav-legend{font-size:12px;color:var(--muted);margin:4px 0}.student-mode.dark .learner-question-list button{background:#3b4763;color:#edf0ff;border-color:#61708f}.student-mode.dark .learner-question-list button.answered{background:#244e3e;color:#e1ffea;border-color:#69a287}.student-mode.dark .learner-question-list button.answered:after{background:#244e3e}.student-mode.dark .learner-question-list button.current{outline-color:#c1b1ff}


/* PC-first visual lessons; diagrams are original schematic illustrations. */
@media screen{body.quiz-focus .visual-learning18{display:none}}
.visual-learning18{background:linear-gradient(130deg,#eaf4ff,#f6f7ff 55%,#e6f6f4);color:#1b3656;border:1px solid #c6d9ef;border-radius:24px;padding:clamp(18px,2.5vw,34px);margin:22px 0;text-align:left}
.learning-heading18 h2{font-size:clamp(1.3rem,2vw,1.85rem);line-height:1.3;margin:14px 0}.learning-heading18>p{max-width:75ch;color:#536b85}
.learning-split18{display:grid;grid-template-columns:minmax(0,1.08fr) minmax(0,1fr);gap:24px;align-items:start;margin-top:22px}.learning-picture18{margin:0;min-width:0;position:sticky;top:12px}.learning-picture18 img{display:block;width:100%;height:auto;border-radius:18px}.learning-picture18 figcaption{font-size:.9rem;line-height:1.5;color:#536b85;margin:12px 3px}.learning-content18{min-width:0}
.learning-tabs18{display:flex;gap:7px;flex-wrap:wrap;margin-bottom:14px}.learning-tabs18 button{padding:9px 12px;font-size:.86rem;background:white;color:#24578e;border:1px solid #c5d9ed;min-height:42px}.learning-tabs18 button.active{background:linear-gradient(110deg,#2259b6,#087e91);color:white;border-color:transparent}.learning-card18{background:white;border:1px solid #d9e5f3;border-radius:18px;padding:25px;min-height:240px;box-shadow:0 8px 30px #1d548c0b}.learning-card18 h3{font-size:1.5rem;line-height:1.3;color:#183c64;margin:10px 0 16px}.learning-card18 p{font-size:1.08rem;line-height:1.8;margin:0;white-space:pre-wrap;color:#314e6c}.learning-kicker18{font-size:.75rem;font-weight:800;letter-spacing:.13em;color:#257880}.learning-controls18{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:14px}.learning-controls18 button{min-height:44px}.learning-count18{white-space:nowrap;color:#496783}.learning-controls18 button:disabled{opacity:.4;pointer-events:none}.learning-practice18{margin-top:22px;background:#ffffffb8;border:1px solid #c6d9ef;border-radius:14px;padding:17px 20px}.learning-practice18 summary{cursor:pointer;font-weight:750;min-height:32px}.learning-practice18 p{white-space:pre-wrap;line-height:1.75;max-width:95ch}.learning-jump18{margin-top:18px;min-height:46px}.visual-preview18{width:min(1380px,96vw)!important;max-width:96vw!important}.learning-questions18{scroll-margin-top:24px}.learning-questions18>.card{max-width:1000px;margin:16px auto}.sheet-subjects18{display:flex;gap:9px;flex-wrap:wrap;margin:20px 0}.sheet-subjects18 button{min-height:48px}.sheet-subjects18 .active{background:linear-gradient(110deg,#245cba,#0e7e91);color:white;border-color:transparent}.sheet-grid18{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}.sheet-grid18 article{min-width:0}.sheet-grid18 article h2{font-size:1.3rem;line-height:1.4}.sheet-thumb18{display:block;width:100%;height:auto;max-height:255px;object-fit:contain;border-radius:14px;background:#f5f9ff;margin-bottom:18px}.sheet-grid18 article>p{font-size:.96rem;line-height:1.6}.sheet-catalog18{margin-top:24px}.visual-learning18 button:focus-visible,.sheet-subjects18 button:focus-visible{outline:3px solid #d58b17;outline-offset:3px}
@media(max-width:900px){.learning-split18{grid-template-columns:1fr}.learning-picture18{position:static;max-width:720px;margin:auto}.learning-card18{min-height:0}.sheet-grid18{grid-template-columns:1fr}.learning-picture18 figcaption{font-size:.85rem}}
@media(max-width:540px){.visual-learning18{padding:14px;border-radius:17px}.learning-card18{padding:18px}.learning-card18 p{font-size:1rem}.learning-tabs18 button{flex:1 1 42%;min-height:48px}.learning-controls18{flex-wrap:wrap}.sheet-subjects18 button{flex:1 1 42%;font-size:.9rem}.visual-preview18{padding:12px!important}.learning-picture18 img{min-height:0}}
@media print{.visual-learning18{background:white!important;border:0;padding:0;margin:0;color:#111;break-inside:auto}.learning-heading18>p,.learning-picture18 figcaption{color:#333}.learning-split18{display:block}.learning-picture18{position:static;width:85%;margin:0 auto 12px;break-inside:avoid}.learning-card18{box-shadow:none;min-height:0;border:1px solid #bbb;padding:12px;margin:10px 0;break-inside:avoid}.learning-card18 p{font-size:10pt;line-height:1.45;color:#111}.learning-card18 h3{font-size:13pt}.learning-tabs18,.learning-controls18,.learning-jump18{display:none}.learning-practice18{break-inside:avoid;border:1px solid #bbb;background:white}.learning-practice18 p{font-size:10pt}.learning-print18 img{max-height:260px;object-fit:contain}.learning-print18 .learning-heading18 h2{font-size:15pt}.print-only .print-question{break-inside:avoid}}
/* Guided teaching workspace */
.teaching-hero19{padding:28px;border-radius:22px;background:linear-gradient(125deg,#123d88,#326fce 60%,#5163ca);color:white;margin:12px 0 22px}.teaching-hero19 h1{color:white}.teaching-hero19 button{background:white;color:#163e78}.teaching-nav19{display:flex;gap:8px;flex-wrap:wrap;position:sticky;top:0;z-index:5;padding:12px;background:#edf3ffed;backdrop-filter:blur(8px);border-radius:14px}.phase19.current{border:2px solid #3876d8;background:linear-gradient(120deg,#e3efff,#f4f3ff)}.phase19{display:inline-block;vertical-align:top;width:calc(50% - 14px);margin:6px;box-sizing:border-box}@media(max-width:650px){.phase19{width:100%;margin:6px 0}.teaching-nav19{position:static}.teaching-hero19{padding:18px}}
/* Companion: one dominant action and a readable five-day overview. */
.companion-main21{border:2px solid #718ce8;background:linear-gradient(135deg,#edf3ff,#f2edff)}
.companion-week21{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:12px;align-items:start}
.companion-week21 .card{padding:14px;min-width:0}.companion-week21 h2{position:sticky;top:0;background:var(--card,#fff);font-size:1.1rem}
.companion-week21 button{display:block;width:100%;white-space:pre-line;text-align:left;min-height:90px;margin:12px 0;border-left:5px solid #6d7dde}
.teaching-nav19{position:sticky;top:0;z-index:4;background:var(--card,#fff);padding:8px;border-radius:14px}
.dark .companion-main21{background:linear-gradient(135deg,#192c50,#342745)}
.dark .companion-week21 h2,.dark .teaching-nav19{background:#17243b}
@media(max-width:1000px){.companion-week21{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:550px){.companion-week21{grid-template-columns:1fr}.teaching-nav19 button{flex:1;padding:12px 6px}.listrow{flex-wrap:wrap}}

.teaching-hero19 .card[role="status"]{color:#20334d;background:#f4f7ff}

/* Published feedback navigation: retain existing question/status colours. */
.student-mode .learner-feedback-summary{border-inline-start:4px solid #147b80;scroll-margin-top:24px}
.student-mode .learner-feedback-summary h2{margin-top:0}
.student-mode .question-nav button.has-feedback{position:relative;overflow:visible}
.student-mode .learner-feedback-badge{position:absolute;top:-5px;right:-5px;width:17px;height:14px;border-radius:5px;background:#123d58;color:transparent;border:2px solid white;pointer-events:none}
.student-mode .learner-feedback-badge::after{content:"";position:absolute;bottom:-5px;left:3px;border-top:5px solid #123d58;border-right:5px solid transparent}
.student-mode .learner-feedback-legend{font-size:.85rem;color:#123d58;font-weight:600}
.student-mode .learner-question-feedback{scroll-margin-block:24px;border-inline-start:4px solid #147b80}
.student-mode .learner-question-feedback:focus,.student-mode .learner-feedback-summary:focus{outline:2px solid #147b80;outline-offset:3px}

.student-mode .learner-question-list button.learner-feedback-summary-link{width:auto;height:auto;min-height:44px;border-radius:12px;padding:10px 16px;font-size:14px}
.student-mode.dark .learner-feedback-legend{color:#b6e5eb}

.student-mode .learner-question-list .question-nav button.result150{background:#e7eaf0;color:#26354b;border-color:#acb6c5}.student-mode .learner-question-list .question-nav button.correct{background:#dceee3;color:#174d30;border-color:#78a78b}.student-mode .learner-question-list .question-nav button.partial{background:#fff0ca;color:#704600;border-color:#ba851e}.student-mode .learner-question-list .question-nav button.incorrect{background:#fbe1e1;color:#8d2020;border-color:#c16b6b}.result-symbol150{position:absolute;bottom:-5px;right:-3px;border-radius:50%;background:inherit;border:1px solid currentColor;min-width:19px;height:19px;font-size:13px;line-height:17px;font-weight:bold}.result-symbol150:empty{display:none}.student-mode .learner-question-list>button{width:auto;height:auto;border-radius:12px;padding:10px 16px;font-size:14px}.student-mode.dark .learner-question-list .question-nav button.result150{background:#303d51;color:#f0f3ff}.student-mode.dark .learner-question-list .question-nav button.correct{background:#214a37;color:#d3ffe0}.student-mode.dark .learner-question-list .question-nav button.partial{background:#584019;color:#ffedb4}.student-mode.dark .learner-question-list .question-nav button.incorrect{background:#612b31;color:#ffe0e3}

/* Learning examples: semantic tables and a narrow-screen-safe process sketch. */
.learning-split18.learning-no-picture156{grid-template-columns:minmax(0,1fr)}
.learning-example-content156{display:grid;gap:16px;min-width:0;margin:12px 0 18px}
.learning-table156{border-collapse:collapse;table-layout:fixed;width:100%;font-size:1rem;line-height:1.5;color:#203e52;background:#fff}
.learning-table156 th,.learning-table156 td{border:1px solid #cad9e3;padding:10px 12px;text-align:left;vertical-align:top;overflow-wrap:anywhere;white-space:pre-wrap}
.learning-table156 thead th{background:#e5f1f4;font-weight:750}
.learning-table156 tbody th{font-weight:600;width:auto}
.learning-table156 tbody tr:nth-child(even){background:#f5f8fb}
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