:root{--ink:#253d34;--muted:#738078;--green:#234e42;--lime:#d9edaa;--paper:#f5f5ef;--line:#dfe4d9;--white:#fff;--radius:20px}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:'PingFang SC','Microsoft YaHei',sans-serif;font-size:15px;line-height:1.65}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer;border:0;background:none;color:inherit}button:disabled{opacity:.4;cursor:default}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #8dab65;outline-offset:3px}a{color:var(--green)}h1,h2,h3,p{margin:0}h1{font-family:'Songti 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button{display:flex;gap:13px;align-items:center;text-align:left;padding:13px 16px;border-radius:12px;color:#68766d}.nav button.active{background:#e2e9da;color:var(--green);font-weight:600}.side-note{margin-top:auto;padding:20px 14px;border-top:1px solid var(--line);font-size:12px;color:var(--muted)}.main{padding:0 42px 60px;min-width:0}.topbar{height:92px;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line);margin-bottom:32px}.topbar .crumb{font-size:13px;color:var(--muted)}.edition{border:1px solid #d6ddcd;border-radius:99px;padding:5px 12px;font-size:11px;letter-spacing:1px}.mobile-brand{display:none}.intro{display:flex;align-items:end;justify-content:space-between;gap:20px;margin:0 0 24px}.eyebrow{text-transform:uppercase;font-size:10px;letter-spacing:2px;color:#76816b;margin-bottom:8px;font-weight:600}.intro p{margin-top:10px;color:var(--muted)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:10px;min-height:44px;padding:10px 18px;background:var(--green);color:white;font-weight:500;text-decoration:none}.btn.light{background:var(--lime);color:var(--ink)}.btn.outline{background:transparent;color:var(--ink);border:1px solid #cbd6c6}.btn.small{padding:7px 12px;font-size:13px}.hero{border-radius:24px;background:var(--green);color:#fff;padding:32px 36px;position:relative;overflow:hidden;display:grid;grid-template-columns:1.3fr 1fr;gap:20px;min-height:260px}.hero h2{font-family:'Songti SC','SimSun',serif;font-size:32px;font-weight:500;line-height:1.5;margin:12px 0}.hero p{font-size:13px;color:#c8d9cf;margin:8px 0 23px}.hero .eyebrow{color:#bfd99e}.tag{display:inline-block;background:#e8eddf;color:#536a4e;border-radius:6px;padding:3px 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32px;border:1px solid var(--line);background:#fafbf6;border-radius:16px;padding:20px 0}.stat{padding:0 24px;border-right:1px solid var(--line)}.stat:last-child{border:0}.stat strong{font-size:27px;font-weight:500;line-height:1.3}.stat small{display:block;font-size:12px}.section-head{display:flex;align-items:center;justify-content:space-between;margin:28px 0 16px}.textbtn{font-size:13px;color:var(--green);padding:8px 0}.subject-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:15px}.subject{padding:22px;text-align:left;background:white;border:1px solid var(--line);border-radius:17px;transition:transform .2s}.subject:hover{transform:translateY(-3px)}.app-icon{width:43px;height:47px;display:grid;place-items:center;background:var(--app);color:white;font-size:25px;font-family:Georgia,serif;border-radius:6px 12px 6px 6px;box-shadow:inset -8px 0 #ffffff19}.subject h3{margin:18px 0 5px}.subject p{font-size:12px;color:var(--muted)}.subject footer{margin-top:20px;display:flex;justify-content:space-between;font-size:11px;color:var(--muted)}.track{height:4px;background:#edf0e7;border-radius:8px;margin-top:12px;overflow:hidden}.track i{display:block;height:100%;background:var(--app,var(--green))}.home-bottom{display:grid;grid-template-columns:1.25fr 1fr;gap:18px;margin-top:24px}.note-card{padding:23px;border:1px solid var(--line);border-radius:17px;background:#eff1e5}.note-card p{font-size:13px;color:var(--muted);margin:10px 0}.path{display:flex;align-items:center;flex-wrap:wrap;gap:8px;font-size:13px}.path span{background:#e9efdf;padding:4px 9px;border-radius:6px}.path em{font-style:normal;color:#9ba68f}.toolbar{display:flex;gap:10px;flex-wrap:wrap;margin:20px 0}.search{width:100%;background:#fff;border:1px solid var(--line);border-radius:12px;padding:13px 16px;min-width:0;color:var(--ink)}.chips{display:flex;gap:8px;overflow-x:auto;padding:3px 1px 8px}.chip{white-space:nowrap;min-height:40px;border:1px solid var(--line);background:white;border-radius:99px;padding:7px 16px;font-size:13px}.chip.active{background:var(--green);color:white;border-color:var(--green)}.lesson-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:15px}.lesson-card{display:flex;gap:14px;align-items:center;background:white;border:1px solid var(--line);border-radius:14px;padding:18px;text-align:left;width:100%}.lesson-card .app-icon{width:36px;height:39px;font-size:20px;flex-shrink:0}.lesson-card h3{font-size:15px}.lesson-card p{font-size:11px;color:var(--muted);margin:5px 0}.lesson-card .arrow{margin-left:auto;color:#8a9d7a}.panel{background:white;border:1px solid var(--line);padding:25px;border-radius:19px;margin:18px 0}.panel p{color:var(--muted);margin:10px 0}.row{display:flex;gap:12px;align-items:center;justify-content:space-between;flex-wrap:wrap}.stack{display:grid;gap:12px}.task-label{font-size:11px;letter-spacing:2px;color:#769157}.task-title{font-size:21px;margin:9px 0 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solid #dce2d6;padding:0 12px 0 0;text-align:center}.commands{display:flex;gap:5px}.command{border:1px solid #e0e6d9;min-width:66px;max-width:120px;min-height:57px;background:#fff;border-radius:7px;padding:8px;font-size:12px}.command b{font-family:Georgia,serif;display:block;font-size:18px;font-weight:500;color:var(--app)}.group small{display:block;margin-top:5px;font-size:10px}.canvas{padding:25px;min-height:260px;display:grid;place-items:center;overflow:hidden}.paper{background:white;width:86%;max-width:450px;min-height:230px;padding:27px;box-shadow:0 3px 10px #203e2e12;font-size:13px;transition:all .3s}.paper h3{margin-bottom:20px;font-size:18px}.paper p{margin:10px 0;line-height:1.9}.selected{outline:2px dashed #6a9463;outline-offset:5px}.sheet{border-collapse:collapse;background:white;font-size:13px;width:100%;max-width:450px;table-layout:fixed}.sheet td,.sheet th{border:1px solid #cfd8c8;padding:10px 7px;text-align:center;overflow-wrap:anywhere}.sheet th{background:#e8ede2;font-weight:400}.sheet .cell{background:#e4f0d9;outline:2px solid #52814e;outline-offset:-2px}.slide{position:relative;width:100%;max-width:440px;min-height:225px;background:#fffef8;border:1px solid #e0e2d5;padding:32px;box-shadow:0 3px 10px #203e2e12}.slide h3{font-family:'Songti SC',serif;font-size:27px;margin-bottom:20px}.slide small{color:#8a9878}.slide-grid{display:grid;grid-template-columns:1fr 1fr;gap:15px}.slide-grid p{background:#e6ecd9;padding:14px;font-size:12px}.effect-badge{margin-top:14px;color:#397349;font-size:12px}.feedback{padding:14px 17px;border-radius:10px;margin-top:14px;background:#f1f3e9;font-size:13px}.feedback.good{background:#e9f2dc;color:#38652d}.feedback.bad{background:#fff1e6;color:#965a31}.hint{font-size:12px;color:var(--muted);margin:10px 0}.empty{text-align:center;padding:40px 20px;color:var(--muted)}.quiz-options{display:grid;gap:10px;margin:22px 0}.quiz-option{text-align:left;border:1px solid var(--line);background:white;border-radius:12px;padding:15px 18px;min-height:52px}.quiz-option.correct{border-color:#6b9960;background:#edf4e3;color:#376531}.quiz-option.wrong{border-color:#c68a68;background:#fff1e7}.quiz-option strong{display:inline-block;margin-right:16px;font-size:12px;color:#8b977e}.flash{min-height:275px;text-align:center;display:flex;flex-direction:column;justify-content:center;align-items:center;background:#fbfcf5}.flash h2{font-size:25px;margin:20px 0}.flash .path{justify-content:center}.flash p{font-size:13px;max-width:430px}.book-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.book{background:white;border:1px solid var(--line);border-radius:18px;padding:25px;text-align:left}.book-cover{height:150px;border-radius:10px;background:#dee7cd;padding:22px;display:flex;flex-direction:column;justify-content:space-between;margin-bottom:17px;font-family:'Songti SC',serif;font-size:23px}.book:nth-child(2) .book-cover{background:#dce5ed}.book-cover small{font-family:monospace;color:#698264;letter-spacing:2px}.viewer{background:#e9ede3;border:1px solid var(--line);border-radius:12px;overflow:auto;max-height:72vh;touch-action:pan-x pan-y}.viewer img{display:block;max-width:none;height:auto;margin:auto}.page-toolbar{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin:15px 0}.page-toolbar input{width:65px;padding:9px;border:1px solid var(--line);border-radius:8px}.page-toolbar label{font-size:12px}.chapter-list{display:flex;gap:8px;overflow:auto;margin:15px 0}.chapter-list button{white-space:nowrap}.progress-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.progress-grid .panel{text-align:center}.progress-grid strong{font-size:34px;font-weight:500}dialog{border:1px solid var(--line);border-radius:22px;padding:28px;width:min(560px,calc(100% - 28px));max-height:85vh;color:var(--ink);background:var(--paper)}dialog::backdrop{background:#102c2477;backdrop-filter:blur(4px)}dialog h2{margin:15px 0}dialog p{line-height:1.9;margin:17px 0;font-size:14px}dialog .close{float:right;font-size:25px;min-width:44px;min-height:44px}dialog .actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}#toast{position:fixed;bottom:90px;left:50%;transform:translateX(-50%);border-radius:10px;background:var(--green);color:white;padding:12px 20px;z-index:10;font-size:13px;display:none;max-width:90vw}.bottomnav{display:none}.fade{animation:fade 1.2s}.fly{animation:fly 1.1s}.animate-enter{animation:appear .4s ease-out}@keyframes fade{from{opacity:0}to{opacity:1}}@keyframes fly{from{transform:translateX(-220px);opacity:0}to{transform:translateX(0);opacity:1}}@keyframes appear{from{opacity:0;transform:translateY(7px)}to{opacity:1;transform:translateY(0)}}@media(min-width:1250px){.main{padding-left:55px;padding-right:55px}}@media(max-width:1050px){.shell{grid-template-columns:190px 1fr}.sidebar{padding:30px 16px}.main{padding-left:25px;padding-right:25px}.hero{padding:26px;grid-template-columns:1.3fr 1fr}.window{width:205px}.subject{padding:17px}.hero h2{font-size:29px}.floating{right:-15px}}@media(max-width:760px){.shell{display:block}.sidebar{display:none}.main{padding:0 20px 110px}.topbar{height:76px;margin-bottom:25px}.topbar .crumb{display:none}.mobile-brand{display:flex}.mobile-brand .brandmark{width:31px;height:31px;border-radius:9px}.mobile-brand .brand{font-size:17px}.edition{font-size:9px;padding:4px 8px}h1{font-size:32px}.intro{margin-bottom:22px}.intro p{font-size:13px}.intro .eyebrow{font-size:9px}.hero{padding:24px;grid-template-columns:1.3fr 1fr;gap:0;min-height:245px}.hero h2{font-size:27px}.hero p{font-size:11px;max-width:190px}.hero .btn{padding:9px 14px;font-size:13px}.window{width:160px;padding:10px;border-width:4px;transform:rotate(-8deg) translateX(22px)}.window .ribbon-art{gap:7px;font-size:7px}.doc-art{padding:12px}.doc-art b{font-size:10px}.floating{bottom:35px;font-size:9px;right:-13px;padding:7px}.hero-art{pointer-events:none}.stats{padding:17px 0;margin:17px 0 25px}.stat{padding:0 17px}.stat strong{font-size:24px}.stat small{font-size:10px}.section-head h2{font-size:19px}.subject-grid{gap:9px}.subject{padding:14px 11px}.subject h3{font-size:13px;margin-top:14px}.subject p{font-size:10px;line-height:1.6;min-height:32px}.subject footer{font-size:9px;margin-top:13px}.subject .app-icon{width:35px;height:39px;font-size:23px}.home-bottom{grid-template-columns:1fr;gap:12px;margin-top:20px}.note-card{padding:19px}.bottomnav{display:flex;position:fixed;bottom:0;left:0;right:0;background:#fcfdf8f5;border-top:1px solid var(--line);padding:8px 8px calc(8px + env(safe-area-inset-bottom));z-index:5;backdrop-filter:blur(14px)}.bottomnav button{flex:1;display:flex;flex-direction:column;align-items:center;gap:3px;font-size:10px;color:#7c8a78;min-height:47px}.bottomnav button.active{color:var(--green);font-weight:700}.bottomnav button.active svg{background:#e1eacb;box-shadow:0 0 0 5px #e1eacb;border-radius:4px;margin-bottom:3px}.lesson-list{grid-template-columns:1fr}.panel{padding:20px;margin:15px 0}.book-grid{grid-template-columns:1fr}.book-cover{height:125px}.task-title{font-size:18px}.canvas{padding:20px 13px;min-height:250px}.paper{padding:20px;width:94%;min-height:230px}.steps{gap:5px}.steps span{padding:5px 7px;font-size:10px}.progress-grid{gap:7px}.progress-grid .panel{padding:17px 6px}.progress-grid strong{font-size:26px}.progress-grid small{font-size:10px}.slide{padding:25px;min-height:210px}.slide h3{font-size:23px}.page-toolbar{gap:7px}.viewer{max-height:65vh}.book h3{font-size:17px}.lab-title{font-size:11px}.task-select{width:100%}.intro .btn{padding:8px 12px;font-size:12px}.flash{min-height:310px}}@media(max-width:370px){.main{padding-left:14px;padding-right:14px}.hero{padding:20px;grid-template-columns:1.5fr 1fr}.hero h2{font-size:24px}.window{width:130px}.floating{display:none}.stat{padding:0 12px}.edition{font-size:8px}}@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}
@media(max-width:760px){.hero{grid-template-columns:minmax(0,1.6fr) minmax(0,1fr)}.hero-art{min-width:0}.window{flex-shrink:0;transform:rotate(-8deg) translateX(35px)}.hero h2{font-size:26px}.hero p{max-width:190px}.floating{right:-23px;bottom:28px}.stat small{white-space:nowrap}.intro h1{font-size:30px}}@media(max-width:370px){.hero h2{font-size:23px}.window{transform:rotate(-8deg) translateX(32px)}}
/* Complete curriculum */
.animate-enter{animation:none}.all-subjects{grid-template-columns:repeat(3,minmax(0,1fr))}.course-icon{display:grid;place-items:center;flex-shrink:0;width:40px;height:43px;border-radius:8px;background:var(--app);color:white;font-family:Georgia,serif;font-size:24px}.course-filters{justify-content:flex-start;margin:16px 0;gap:16px}.course-filters label{display:flex;align-items:center;gap:8px;min-width:0;font-size:12px}.course-filters select{max-width:280px}.load-more{margin:20px 0}.course-progress{display:flex;justify-content:space-between;font-size:12px;gap:12px}.stage-tabs{margin-top:20px}.learning-card h2{margin:20px 0}.learning-card .meaning{font-size:18px;color:var(--ink);line-height:1.9;margin:24px 0}.focus-crop{position:relative;overflow:hidden;max-height:240px;min-height:70px;background:white;border:1px solid var(--line);border-radius:10px}.focus-crop img{position:absolute;max-width:none;height:auto}.crop-highlight{position:absolute;outline:2px solid #7b9b48;background:#cce99425;pointer-events:none}.concept-symbol{display:flex;gap:20px;align-items:center;background:#eff3e7;padding:30px;border-radius:12px}.concept-symbol .course-icon{width:62px;height:68px;font-size:38px}.term-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}.term-pill{display:flex;align-items:center;gap:8px;min-height:48px;padding:10px 12px;border:1px solid var(--line);border-radius:10px;background:white;font-size:12px;text-align:left;overflow-wrap:anywhere}.term-pill span{font-size:10px;color:#8d9b80}.term-pill.active{border-color:var(--green);background:#eaf0df}.term-pill.read span{color:#367b47}.source-inline{overflow:auto;margin-top:18px}.source-inline img{display:block;width:100%;height:auto}.course-footer{display:flex;justify-content:space-between;margin:28px 0}.hotspot-scroll{max-height:70vh;overflow:auto;border:1px solid var(--line);border-radius:12px;background:#e8eddf;overscroll-behavior:contain}.hotspot-image{position:relative;min-width:100%}.hotspot-image>img{width:100%;display:block;height:auto}.hotspot-layer{position:absolute;inset:0}.hotspot{position:absolute;transform:translate(-50%,-50%);width:34px;height:34px;min-width:34px;border-radius:50%;border:2px solid white;background:#234e42ed;color:white;box-shadow:0 1px 6px #102c2430;font-size:12px;z-index:1;touch-action:manipulation}.hotspot.hinted{background:#bf691e;box-shadow:0 0 0 7px #e8ba6d88;z-index:3}.correction{border-left:3px solid #ba8c42}.practice-switch{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:26px}.ordered-steps{padding-left:28px}.ordered-steps li{padding:9px 5px;color:#356c47}.function-fields{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin:20px 0}.function-fields label,.prediction{display:block;font-size:12px;color:#64765d}.function-fields input,.prediction input{margin-top:7px}.prediction{margin:20px 0}.formula-result{background:#e8f0dc;padding:24px;margin:22px 0;border-radius:14px;overflow-wrap:anywhere}.formula-result strong{display:block;font-size:32px;font-weight:500;margin:8px 0}.formula-result p{font-size:13px}.coverage-table{overflow:auto;margin-top:20px}.coverage-table table{width:100%;border-collapse:collapse;font-size:12px}.coverage-table th,.coverage-table td{text-align:left;padding:10px 8px;border-bottom:1px solid var(--line);vertical-align:top}.coverage-table th{font-weight:500;color:var(--muted)}.coverage-table td:first-child{white-space:nowrap}.coverage-table th:last-child{min-width:44px}details summary{cursor:pointer;font-weight:600;min-height:32px}.glossary-list .panel{padding:17px 20px;margin:8px 0}.glossary-entry summary small{float:right;font-weight:400}.glossary-entry[hidden]{display:none}.import-label{position:relative;overflow:hidden;cursor:pointer}.import-label input{position:absolute;inset:0;opacity:0;cursor:pointer}.source-inline img{max-width:none}.term-pill:hover,.lesson-card:hover{border-color:#a8b99a}
@media(max-width:760px){.all-subjects{grid-template-columns:repeat(3,minmax(0,1fr))}.course-filters{align-items:stretch}.course-filters label:first-child{width:100%}.course-filters select{max-width:100%;min-width:0;flex:1}.term-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.learning-card .meaning{font-size:16px}.stage-tabs .chip{font-size:12px;padding:8px 12px}.learning-card{padding:20px 16px}.function-fields{grid-template-columns:1fr}.practice-switch .btn{font-size:12px;padding:8px 12px}.course-icon{width:35px;height:39px;font-size:23px}.coverage-table th,.coverage-table td{padding:9px 5px}.coverage-table td:nth-child(2){min-width:135px}.course-progress{font-size:11px}.focus-crop{min-height:65px}.hotspot{width:40px;height:40px}.intro{align-items:start}.intro>.btn{flex-shrink:0}.all-subjects .subject h3{font-size:12px}}
.focus-crop{width:100%;min-height:0;max-height:none}.intro>div{min-width:0}.lesson-card>div{min-width:0}.lesson-card h3{overflow-wrap:anywhere}
.location-options{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:16px}.location-option{min-width:0;border:1px solid var(--line);padding:10px;border-radius:10px;background:#fff;text-align:left}.location-option>span{display:block;font-size:12px;margin-bottom:8px}.location-option .crop-highlight{display:none}@media(max-width:760px){.location-options{grid-template-columns:1fr}}
/* Application questions stay readable at phone widths, including long formulas. */
.exam-entry{border-left:5px solid var(--accent,#234e42);background:#eef5f0}
.exam-entry .tag{margin-bottom:12px}
.exam-stats{grid-template-columns:repeat(3,minmax(0,1fr))}
.exam-stats .stat{min-width:0}
.exam-stats .stat small{white-space:normal;overflow-wrap:anywhere}
.supp-entry{border-top:4px solid #486b78;background:#f0f5f5}
.supp-entry .tag{margin-bottom:12px}
.supp-section h2{margin-bottom:14px}
.supp-section p,.supp-prose{white-space:pre-wrap;overflow-wrap:anywhere;line-height:1.9}
.supp-prose{margin:14px 0}
.supp-steps{padding-left:23px;line-height:1.9}
.supp-steps li{padding:4px 0;white-space:pre-wrap;overflow-wrap:anywhere}
.supp-table{width:100%;max-width:100%;overflow-x:auto;margin:18px 0;border:1px solid #dce5de;border-radius:10px}
.supp-table:focus-visible{outline:3px solid #8dab65;outline-offset:3px}
.supp-table table{border-collapse:collapse;width:100%;font-size:13px}
.supp-table th,.supp-table td{padding:10px 12px;text-align:left;border-bottom:1px solid #dce5de;min-width:65px}
.supp-table th{background:#e8f0eb;white-space:nowrap}
.supp-table td{overflow-wrap:anywhere}
.supp-code{white-space:pre-wrap;overflow-wrap:anywhere;line-height:1.7;background:#edf1ed;padding:15px;border-radius:10px;font-size:13px}
.supp-outline-item{padding:16px 0;border-top:1px solid #dce5de}
.supp-outline-item:first-of-type{border-top:0}
.supp-outline-item .chip{white-space:normal;text-align:left;max-width:100%}
.supp-lab-output .formula-result strong{overflow-wrap:anywhere}
@media(max-width:480px){.supp-section h2{font-size:20px}.supp-table th,.supp-table td{padding:9px 10px}.supp-entry h2{font-size:21px}}
.exam-group-list{margin-top:18px}
.exam-group{display:flex;align-items:flex-start;gap:16px;margin-bottom:0}
.exam-group>div{min-width:0;flex:1}
.exam-group .course-icon{flex-shrink:0}
.exam-prompt{white-space:pre-wrap;overflow-wrap:anywhere;line-height:1.75}
.exam-question .quiz-option{align-items:flex-start;text-align:left;white-space:pre-wrap;overflow-wrap:anywhere}
.exam-question .quiz-option span{min-width:0}
.exam-question .exam-selected{border-color:#234e42;background:#e8f1eb;box-shadow:inset 0 0 0 1px #234e42}
.exam-question .quiz-option:disabled{opacity:1}
.exam-question .quiz-option.correct{border-color:#287355;background:#e8f1eb}
.exam-question details{margin-top:20px}
.exam-question li,.exam-sources li{margin-bottom:12px;overflow-wrap:anywhere}
.exam-related{margin-top:22px;border-top:1px solid #dce5de;padding-top:12px}
.exam-sources a{color:#245b4b;text-decoration:underline}
.exam-question .search{font-size:16px}
@media(max-width:480px){.exam-group{gap:10px;padding:18px 14px}.exam-group .row{gap:12px}.exam-question{padding:20px 16px}.exam-question .task-title{font-size:19px}.exam-question ul{padding-left:20px}.exam-related .textbtn{text-align:left;white-space:normal}}

/* Quiet course hierarchy: headings and spacing carry the structure. */
.supp-entry .section-head{margin:0 0 8px;gap:12px;align-items:baseline;flex-wrap:wrap}
.supp-entry .section-head h2{margin:0}
.supp-count{font-size:13px;color:var(--muted,#647079);font-variant-numeric:tabular-nums}
.supp-section{border:0;border-bottom:1px solid #dce3e5;border-radius:0;box-shadow:none;background:transparent;padding:24px 4px}
.supp-section h2{margin-bottom:12px}
.supp-table{border-right:2px solid #dce3e5;overscroll-behavior-x:contain}
.exam-rules{padding:16px 20px}
.exam-rules summary{font-size:14px}

/* Touch navigation and long-lesson reading. */
.supp-section-nav{display:grid;grid-template-columns:repeat(3,1fr);border-bottom:1px solid var(--line);margin:20px 0;gap:8px}
.supp-section-nav button{min-height:44px;color:var(--green);font-size:14px;border-bottom:2px solid #a6b8aa}
#supp-reading,#supp-explore,#supp-practice{scroll-margin-top:16px}
@media(max-width:760px){
 .textbtn,summary{min-height:44px}
 select,input,textarea{font-size:16px}
 .function-fields select{display:block;width:100%;min-height:44px;margin-top:7px}
 .all-subjects{grid-template-columns:repeat(2,minmax(0,1fr))}
 .all-subjects .subject h3{font-size:15px}
 .all-subjects .subject p,.all-subjects .subject footer{font-size:12px}
 .supp-section p,.supp-prose{color:var(--ink)}
 .quiz-option{min-height:48px}
}

.supp-lab-picker{display:flex;align-items:center;gap:12px;margin:18px 0;font-size:13px}.supp-lab-picker select{flex:1;min-width:0;min-height:44px}
/* Personal learning dashboard */
.dash-metrics{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}
.dash-metrics>div{padding:24px 18px;background:#fff;border:1px solid var(--line);border-radius:16px}
.dash-metrics strong{display:block;font-size:32px;font-variant-numeric:tabular-nums;font-weight:600}
.dash-metrics span,.dash-caption{font-size:12px;color:var(--muted)}
.dash-caption{margin:14px 0 24px;line-height:1.8}.dash-advice{padding:18px 0;border-bottom:1px solid var(--line)}
.dash-advice h3{font-size:17px}.dash-advice p{margin:9px 0 14px}.dash-chart{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:8px;margin-top:22px}
.dash-day{display:flex;align-items:center;flex-direction:column;gap:8px;min-width:0;border-radius:8px;padding:8px 2px}.dash-day.selected{outline:2px solid var(--green)}
.dash-day>span{font-size:12px}.dash-day small{font-size:11px}.dash-bar{height:90px;width:100%;max-width:34px;display:flex;flex-direction:column;justify-content:flex-end;background:#f1f3ee;border-radius:5px;overflow:hidden}.dash-bar i{display:block;background:#497a63;min-height:0}.dash-bar i.answers{background:#be924a}
.dash-legend{font-size:12px;display:flex;align-items:center;justify-content:center;gap:8px}.dash-legend i{height:8px;width:8px;background:#497a63;border-radius:2px}.dash-legend i.answers{background:#be924a;margin-left:10px}
.dash-subject{padding:16px 0;border-bottom:1px solid var(--line)}.dash-subject h3{font-size:16px;margin-bottom:10px}.dash-subject p{font-size:12px;margin:10px 0 0}
.dash-filters{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin:20px 0 12px}.dash-filters label{font-size:12px;min-width:0}.dash-filters select{display:block;width:100%;min-width:0;min-height:44px;margin-top:6px}
.dash-event{border-bottom:1px solid var(--line);padding:20px 0;overflow-wrap:anywhere}.dash-event-meta{display:flex;gap:10px;justify-content:space-between;color:var(--muted);font-size:11px;margin-bottom:10px}.dash-event h3{font-size:16px;line-height:1.7;white-space:pre-wrap}.dash-answer{font-size:13px;white-space:pre-wrap;margin:10px 0}.dash-old{padding:12px 0;border-bottom:1px solid var(--line);overflow-wrap:anywhere}.dash-old summary{font-size:14px}.dash-old p{font-size:13px}.dash-wrap{flex-wrap:wrap}#dash-history{scroll-margin-top:16px}
@media(max-width:760px){.dash-metrics{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.dash-metrics>div{padding:18px}.dash-metrics strong{font-size:30px}.dash-filters{grid-template-columns:repeat(2,minmax(0,1fr))}.dash-filters label:last-child{grid-column:1/-1}.dash-event-meta{flex-wrap:wrap}.dash-bar{max-width:25px}.dash-chart{gap:4px}}