:root{--ink:#1d1d1f;--muted:#6e6e73;--paper:#f5f5f7;--white:#fff;--blue:#0071e3;--blue-hover:#0063c8;--line:#e4e4e8;--soft:#eaf3fe;--red:#bd3933;--radius:26px;--font:-apple-system,BlinkMacSystemFont,"SF Pro Display","SF Pro Text","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.6 var(--font);-webkit-font-smoothing:antialiased}button,input,select,textarea{font:inherit}button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}button{cursor:pointer;color:inherit}button:disabled{cursor:wait;opacity:.48}a{color:var(--blue);text-decoration:none}button{border:0;background:none}button,a{touch-action:manipulation}h1,h2,h3,p{margin:0}h1,h2,h3{line-height:1.25;letter-spacing:-.04em}h1{font-weight:650}p{text-wrap:pretty}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid #0071e3;outline-offset:4px}main:focus{outline:0}button{transition:background .18s,color .18s,transform .18s}button:active{transform:translateY(1px)}button:disabled:active{transform:none}.skip-link{position:fixed;left:15px;top:-80px;background:white;padding:12px;z-index:100}.skip-link:focus{top:10px}.wrap{max-width:1160px;padding:0 32px;margin:auto}.muted{color:var(--muted)}.eyebrow{font-size:12px;letter-spacing:.12em;font-weight:650;text-transform:uppercase}.blue{color:var(--blue)}.icon{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0}.icon.small{width:16px;height:16px}.icon-button{display:inline-flex;align-items:center;justify-content:center;min-width:44px;min-height:44px;border-radius:50%;background:#ededf0}.icon-button:hover{background:#dedee3}.button{display:inline-flex;align-items:center;justify-content:center;gap:10px;border-radius:24px;background:var(--blue);color:white;padding:12px 23px;min-height:46px;font-size:14px;font-weight:550;white-space:nowrap}.button:hover{background:var(--blue-hover)}.button.secondary{background:#eeeef1;color:var(--ink)}.button.secondary:hover{background:#e1e1e7}.button.light{background:white;color:var(--ink)}.button.small{padding:10px 18px;min-height:42px}.text-button{color:var(--blue);display:inline-flex;align-items:center;gap:7px;min-height:44px;font-size:14px;padding:0}.text-button:hover{text-decoration:underline}.pill{display:inline-flex;align-items:center;gap:6px;padding:5px 11px;border-radius:16px;background:#e9e9ed;font-size:11px;font-weight:550;line-height:1.6}.pill.soft{color:#0058ae;background:#dfedff}.dot{width:6px;height:6px;border-radius:50%;background:currentColor;display:inline-block}.arrow{font-size:21px;line-height:1}.section-label{display:flex;justify-content:space-between;align-items:center;margin:42px 0 22px;gap:20px}.section-label h2{font-size:27px;font-weight:600}.section-label p{font-size:13px;margin-top:7px;color:var(--muted)}
/* A quiet, translucent navigation with one consistent learning context. */
#header{position:sticky;top:0;z-index:20;background:rgba(250,250,252,.92);backdrop-filter:blur(20px);border-bottom:1px solid rgba(0,0,0,.065)}.nav{display:flex;align-items:center;justify-content:space-between;gap:26px;min-height:76px}.brand{display:flex;align-items:center;gap:9px;white-space:nowrap;font-size:20px;font-weight:650;letter-spacing:-.06em;color:var(--ink)}.brand img{width:30px;height:30px}.nav-links{display:flex;gap:30px;align-items:center}.nav-links a{position:relative;color:var(--muted);font-size:13px;min-height:76px;display:flex;align-items:center}.nav-links a.active{color:var(--ink);font-weight:600}.nav-links a.active:after{content:"";position:absolute;bottom:0;height:2px;background:var(--ink);left:0;right:0}.nav-right{display:flex;align-items:center;gap:15px}.segment{display:flex;gap:3px;background:#eaeaec;padding:4px;border-radius:24px}.segment button{border-radius:20px;padding:6px 15px;min-height:32px;font-size:12px;color:var(--muted)}.segment button.active{background:white;color:var(--ink);box-shadow:0 1px 4px #00000012}.settings-button{background:transparent;color:#77777e}
/* Home: generous typography, then a concrete next step. */
.context-bar{display:flex;align-items:center;justify-content:space-between;padding-top:29px;gap:12px}.context-label{display:flex;align-items:center;gap:8px;font-size:12px;color:var(--muted)}.local-label{font-size:11px;color:var(--muted)}.hero{padding:48px 0 38px;display:flex;justify-content:space-between;align-items:flex-end;gap:30px}.hero h1{font-size:clamp(38px,4.2vw,58px);line-height:1.18;letter-spacing:-.055em}.hero h1 .blue{display:block}.hero p{margin-top:21px;color:var(--muted);font-size:15px;letter-spacing:.015em}.hero-aside{text-align:right;padding-bottom:4px;font-size:12px;color:var(--muted);min-width:130px}.hero-aside strong{display:block;color:var(--ink);font-size:42px;font-weight:450;letter-spacing:-.06em;line-height:1.3}.hero-aside .text-button{font-size:12px}.subject-bar{display:flex;gap:8px;overflow-x:auto;scrollbar-width:none;padding:0 0 23px;align-items:center}.subject-bar::-webkit-scrollbar{display:none}.subject{padding:9px 20px;min-height:44px;font-size:13px;border:1px solid transparent;border-radius:25px;white-space:nowrap;background:white;color:var(--muted)}.subject:hover{background:#e7e7eb;color:var(--ink)}.subject.active{background:var(--ink);color:white}.subject small{font-size:10px;opacity:.75;margin-left:7px}.home-grid{display:grid;grid-template-columns:1.7fr 1fr;gap:20px}.daily-card{background:linear-gradient(115deg,#edf5ff 0%,#f4f8fe 60%,#e4f0fd 100%);border-radius:var(--radius);padding:32px;display:flex;gap:24px;align-items:center;min-height:268px}.daily-copy{flex:1}.daily-copy h2{font-size:28px;margin:14px 0 10px;letter-spacing:-.04em}.daily-copy p{color:#61748a;font-size:13px;max-width:310px}.daily-copy .button{margin-top:23px}.progress-ring{width:168px;height:168px;flex:0 0 168px;position:relative}.progress-ring svg{width:100%;height:100%;transform:rotate(-90deg)}.progress-ring circle{fill:none;stroke-width:5}.progress-ring .track{stroke:#cfdfef}.progress-ring .fill{stroke:var(--blue);stroke-linecap:round;transition:stroke-dashoffset .5s}.ring-copy{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center}.ring-copy strong{font-size:45px;font-weight:450;letter-spacing:-.07em;line-height:1.15}.ring-copy strong small{font-size:19px;color:#728396;letter-spacing:0;margin-left:3px}.ring-copy span{font-size:11px;color:#677b90;margin-top:9px}.review-card{background:var(--ink);color:white;border-radius:var(--radius);padding:32px;display:flex;flex-direction:column;align-items:flex-start;position:relative;overflow:hidden}.review-card .eyebrow{color:#adadb7}.review-card h2{font-size:26px;margin:16px 0 10px;font-weight:550}.review-card p{font-size:13px;color:#bdbdc5;max-width:245px;margin-bottom:24px}.review-card .text-button{color:#96c9ff;margin-top:auto}.review-card .corner-icon{position:absolute;top:27px;right:25px;color:#8a8a94}.review-card .corner-icon .icon{width:27px;height:27px}.metrics{display:grid;grid-template-columns:repeat(4,1fr);padding:26px 0;border-bottom:1px solid var(--line);margin:10px 0 30px}.metric{padding:0 28px;border-left:1px solid var(--line)}.metric:first-child{border:0;padding-left:8px}.metric .number{font-size:26px;letter-spacing:-.04em;font-weight:550;line-height:1.4}.metric .number small{font-size:12px;font-weight:400;margin-left:4px;color:var(--muted)}.metric .label{font-size:11px;color:var(--muted);margin-top:3px}.topic-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.topic-card{background:white;border-radius:21px;padding:25px;display:flex;flex-direction:column;align-items:flex-start;min-height:202px;position:relative;transition:transform .2s,box-shadow .2s}.topic-card:hover{box-shadow:0 8px 25px #00000006;transform:translateY(-2px)}.topic-card h3{font-size:19px;line-height:1.5;font-weight:600;margin:15px 0 11px;letter-spacing:-.035em;overflow-wrap:anywhere}.topic-card p{font-size:12px;color:var(--muted)}.topic-card .topic-bottom{margin-top:auto;padding-top:22px;display:flex;align-items:center;justify-content:space-between;width:100%;gap:10px}.topic-card .topic-symbol{font-size:18px;font-weight:450;color:#7796b4;margin-left:auto}.topic-kicker{display:flex;align-items:center;gap:10px;width:100%;color:var(--muted);font-size:11px}.topic-bottom .text-button{min-height:32px;font-size:12px}.topic-bottom .round-arrow{width:35px;height:35px;border-radius:50%;background:#f5f5f7;display:grid;place-items:center;color:var(--ink)}.resource-note{display:flex;justify-content:space-between;align-items:center;gap:25px;padding:29px 0;color:var(--muted);font-size:12px;border-bottom:1px solid var(--line)}.resource-note span{display:flex;align-items:center;gap:9px}.resource-note strong{font-weight:500;color:var(--ink)}#footer{padding:26px 0 38px;color:#86868b;font-size:11px}.footer-inner{display:flex;justify-content:space-between;align-items:center;gap:20px}.footer-brand{font-weight:550;color:var(--muted)}
/* Topic library and records */
.page-heading{padding:55px 0 31px}.page-heading .eyebrow{color:var(--blue);margin-bottom:13px}.page-heading h1{font-size:43px}.page-heading p{color:var(--muted);font-size:14px;margin-top:15px}.search-row{display:flex;align-items:center;gap:15px;margin:6px 0 25px}.search-box{position:relative;flex:1;max-width:530px}.search-box .icon{position:absolute;left:17px;top:14px;color:#8d8d93}.search-box input{padding:12px 18px 12px 48px;min-height:48px;width:100%;border:1px solid #dedee3;border-radius:14px;background:white;font-size:14px}.result-count{font-size:12px;color:var(--muted);margin-left:auto}.library-grid{margin-top:22px}.load-more{display:flex;justify-content:center;padding:32px}.empty{padding:62px 25px;text-align:center;background:white;border-radius:var(--radius);margin:20px 0}.empty .empty-icon{margin:0 auto 20px;width:60px;height:60px;border-radius:50%;background:#edf4fd;color:var(--blue);display:grid;place-items:center}.empty h2{font-size:24px;margin-bottom:10px}.empty p{font-size:14px;color:var(--muted);margin-bottom:24px}.filters{display:flex;gap:10px;margin:0 0 22px}.filters button{min-height:44px;padding:10px 19px;border-radius:24px;color:var(--muted);font-size:13px}.filters button.active{background:white;color:var(--ink)}.note-row{display:grid;grid-template-columns:1fr auto;gap:25px;padding:27px;background:white;border-radius:20px;margin-bottom:13px;align-items:center}.note-row h3{font-size:16px;letter-spacing:0;line-height:1.8;max-height:5.4em;overflow:hidden;margin:9px 0}.note-row p{font-size:12px;color:var(--muted)}.note-actions{display:flex;flex-direction:column;align-items:flex-end;gap:10px}.note-meta{display:flex;flex-wrap:wrap;align-items:center;gap:8px}.note-meta .pill{font-size:10px}.chart-card{background:white;padding:30px;border-radius:var(--radius)}.chart-card h2{font-size:21px}.chart-card p{color:var(--muted);font-size:12px;margin-top:9px}.week-chart{display:grid;grid-template-columns:repeat(7,1fr);gap:15px;height:185px;align-items:end;margin-top:23px}.day{height:100%;display:flex;flex-direction:column;align-items:center;justify-content:flex-end;gap:10px;font-size:11px;color:var(--muted)}.day .bar{width:36px;min-height:4px;border-radius:5px;background:#cde4fc}.day:last-child .bar{background:var(--blue)}.day strong{font-weight:500;color:var(--ink)}.history-row{padding:22px 0;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;gap:20px;align-items:center}.history-row h3{font-size:15px;letter-spacing:0;line-height:1.6}.history-row p{font-size:12px;color:var(--muted);margin-top:6px}.history-right{text-align:right;white-space:nowrap;font-size:13px}.evidence-note{font-size:12px;color:var(--muted);line-height:1.8;margin:20px 0}.history-right a{display:block;font-size:12px;margin-top:7px}
/* Focused practice keeps source math intact and answers behind submission. */
.practice-top{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:28px 0 23px}.practice-context{text-align:right;font-size:12px;color:var(--muted)}.practice-context strong{font-weight:550;color:var(--ink);display:block;font-size:14px}.practice-layout{display:grid;grid-template-columns:minmax(0,1fr) 238px;gap:22px;align-items:start}.question-panel{background:white;padding:35px 40px;border-radius:var(--radius);min-width:0}.question-heading{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:27px}.question-heading .counter{font-size:13px;color:var(--muted)}.question-heading .counter strong{font-size:25px;color:var(--ink);font-weight:500;margin-right:5px}.question-tools{display:flex;gap:8px;align-items:center}.question-tools .icon-button{background:#f6f6f8}.question-tools .saved{color:var(--blue)}.question-type{font-size:11px;color:var(--blue);margin-bottom:17px;letter-spacing:.03em}.source-html{font-size:17px;line-height:1.95;overflow-wrap:anywhere;min-width:0}.source-html p{margin:9px 0}.source-html p:empty{display:none}.source-html img{max-width:100%;height:auto;vertical-align:middle;object-fit:contain}.source-html table{max-width:100%;width:auto;border-collapse:collapse;display:block;overflow-x:auto;margin:15px 0}.source-html td,.source-html th{border:1px solid var(--line);padding:8px}.source-html ul,.source-html ol{padding-left:24px}.source-html h1,.source-html h2,.source-html h3{font-size:20px;margin:20px 0 12px;letter-spacing:0}.source-html sup,.source-html sub{line-height:0}.subquestion{margin:22px 0;padding-top:18px;border-top:1px solid var(--line)}.subquestion .sub-label{font-size:13px;font-weight:600;margin-bottom:8px}.embedded-option{margin:7px 0;display:flex;gap:13px}.options{display:grid;gap:11px;margin:28px 0}.option{display:flex;align-items:flex-start;text-align:left;width:100%;padding:14px 18px;background:white;border:1px solid #e4e4e9;border-radius:14px;gap:14px;font-size:16px;min-height:53px}.option-letter{width:28px;height:28px;border:1px solid #dddde3;border-radius:50%;font-size:13px;display:grid;place-items:center;flex:0 0 28px;color:var(--muted)}.option .source-html{font-size:16px;flex:1;min-width:0}.option:hover:not(:disabled){background:#f8faff;border-color:#98bfe6}.option.selected{border-color:var(--blue);background:#f0f7ff}.option.selected .option-letter{background:var(--blue);color:white;border-color:var(--blue)}.option:disabled{opacity:1;cursor:default}.answer-input{margin:25px 0}.answer-input label{font-size:13px;font-weight:550;display:block;margin-bottom:10px}.answer-input textarea,.scratch textarea{width:100%;resize:vertical;min-height:140px;border:1px solid #dcdce2;border-radius:13px;padding:16px;background:#fcfcfd;line-height:1.8;font-size:15px}.answer-input small{font-size:11px;color:var(--muted)}.source-meta{font-size:11px;color:var(--muted);border-top:1px solid var(--line);padding-top:19px;margin-top:30px;line-height:1.8}.question-actions{display:flex;align-items:center;justify-content:space-between;gap:15px;padding-top:24px}.question-actions .button{min-width:120px}.save-status{font-size:11px;color:var(--muted)}.feedback{margin-top:28px;border-top:1px solid var(--line);padding-top:24px}.feedback-title{display:flex;align-items:center;gap:9px;font-size:18px;font-weight:550;margin-bottom:15px}.feedback-title.correct{color:var(--blue)}.feedback-title.incorrect{color:var(--red)}.feedback h3{font-size:13px;font-weight:600;letter-spacing:0;margin:22px 0 8px;color:var(--muted)}.feedback .source-html{font-size:16px}.self-assess{background:var(--paper);padding:20px;border-radius:16px;margin:22px 0}.self-assess p{font-size:13px;margin-bottom:15px}.self-assess .button{font-size:12px;padding:10px 16px;margin-right:8px}.sidebar-panel{background:white;padding:24px;border-radius:22px;position:sticky;top:100px}.sidebar-panel h2{font-size:15px;letter-spacing:0;margin-bottom:18px}.question-map{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}.question-map button{border-radius:9px;background:var(--paper);font-size:12px;min-height:38px;border:1px solid transparent}.question-map button.current{border-color:var(--ink)}.question-map button.correct{background:#dfedff;color:#005fbd}.question-map button.incorrect{background:#fbe8e6;color:#a32f2a}.question-map button.pending{background:#fff1d9;color:#785000}.legend{font-size:10px;color:var(--muted);line-height:2;margin:15px 0 20px}.sidebar-panel>.button{width:100%;font-size:12px}.sidebar-panel .side-note{font-size:11px;color:var(--muted);margin-top:17px}.scratch{margin-top:24px;border-top:1px solid var(--line);padding-top:20px}.scratch summary{cursor:pointer;font-size:12px;color:var(--muted);min-height:30px}.scratch textarea{margin-top:10px;min-height:150px;font-size:13px}.scratch small{font-size:10px;color:var(--muted)}.result-hero{text-align:center;padding:65px 20px 35px}.result-hero h1{font-size:39px;margin:17px 0}.result-hero p{color:var(--muted);font-size:14px}.result-stats{display:flex;justify-content:center;gap:50px;margin:32px 0}.result-stat strong{display:block;font-size:34px;font-weight:500}.result-stat span{font-size:12px;color:var(--muted)}.result-actions{display:flex;justify-content:center;gap:12px;margin:25px 0}.results-list{max-width:800px;margin:auto}.result-line{width:100%;text-align:left;display:flex;justify-content:space-between;gap:20px;align-items:center;padding:21px 24px;background:white;margin-bottom:10px;border-radius:15px}.result-line strong{font-size:14px;font-weight:500}.result-line span{font-size:12px;color:var(--muted)}
/* Native dialog provides focus trapping and keyboard dismissal. */
dialog{border:0;border-radius:26px;padding:0;max-width:600px;width:calc(100% - 32px);max-height:85vh;background:white;color:var(--ink);box-shadow:0 20px 100px #0003}dialog::backdrop{background:#0006;backdrop-filter:blur(7px)}.dialog-head{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:25px 30px;border-bottom:1px solid var(--line);position:sticky;top:0;background:white;z-index:1}.dialog-head h2{font-size:23px}.dialog-body{padding:25px 30px 30px}.dialog-body>p{font-size:13px;color:var(--muted);margin-bottom:23px}.field{display:block;margin-bottom:21px;font-size:12px;font-weight:550}.field input,.field select{display:block;width:100%;margin-top:8px;border:1px solid #d7d7dd;border-radius:12px;padding:11px 14px;background:#fcfcfd;min-height:47px;font-size:15px;color:var(--ink)}.dialog-actions{display:flex;justify-content:flex-end;gap:12px;margin-top:26px}.topic-dialog{max-width:760px}.topic-dialog .dialog-head h2{font-size:21px;line-height:1.5}.topic-dialog .source-html{font-size:15px}.loading{min-height:400px;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:15px;color:var(--muted);font-size:13px}.loader{width:25px;height:25px;border:2px solid #ddd;border-top-color:var(--blue);border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}#toast{position:fixed;bottom:28px;left:50%;transform:translateX(-50%);background:#252527;color:white;box-shadow:0 4px 20px #0002;padding:13px 23px;border-radius:13px;font-size:13px;max-width:calc(100% - 32px);z-index:60;opacity:0;pointer-events:none;transition:opacity .2s}#toast.show{opacity:1}.error-box{padding:35px;text-align:center}.error-box p{margin-bottom:20px}.missing-media{font-size:12px;color:var(--red);background:#fcebe9;padding:4px}.saved-note{font-size:12px;white-space:pre-wrap;margin-top:10px;color:var(--ink)}
@media(min-width:1450px){.wrap{max-width:1220px}.hero{padding-top:60px;padding-bottom:46px}.hero h1{font-size:64px}.daily-card,.review-card{min-height:280px}}
@media(max-width:1000px){.nav{gap:18px}.nav-links{gap:20px}.wrap{padding:0 26px}.brand{font-size:18px}.nav-right{gap:5px}.home-grid{grid-template-columns:1.5fr 1fr}.daily-card{padding:26px;gap:15px}.progress-ring{width:130px;height:130px;flex-basis:130px}.ring-copy strong{font-size:36px}.daily-copy h2{font-size:24px}.review-card{padding:26px}.topic-card{padding:22px}.practice-layout{grid-template-columns:minmax(0,1fr) 195px}.question-panel{padding:28px}.sidebar-panel{padding:20px}.question-map{gap:5px}.metric{padding:0 20px}}
@media(max-width:760px){.wrap{padding:0 22px}.nav{min-height:65px;flex-wrap:wrap;gap:0;padding-top:11px}.brand{font-size:19px}.nav-right{margin-left:auto}.nav-links{order:3;width:100%;justify-content:space-between;gap:15px}.nav-links a{min-height:48px;font-size:12px}.segment button{padding:4px 13px;min-height:30px}.settings-button{min-width:37px;min-height:37px}.hero{padding:31px 0 29px;align-items:flex-start;gap:5px}.hero h1{font-size:38px}.hero p{font-size:12px;margin-top:17px;max-width:260px;line-height:1.8}.hero-aside{display:none}.context-bar{padding-top:23px}.context-label{font-size:11px}.local-label{font-size:10px}.subject-bar{gap:7px;padding-bottom:19px;margin-right:-22px;padding-right:22px}.subject{padding:8px 17px;min-height:41px;font-size:12px}.subject small{display:none}.home-grid{grid-template-columns:1fr;gap:13px}.daily-card{padding:26px 22px;min-height:245px;gap:12px}.daily-copy h2{font-size:24px}.daily-copy p{font-size:12px;max-width:190px}.daily-copy .button{font-size:12px;padding:11px 19px;margin-top:20px}.progress-ring{width:122px;height:122px;flex-basis:122px}.ring-copy strong{font-size:34px}.ring-copy strong small{font-size:14px}.ring-copy span{font-size:10px}.review-card{padding:24px;min-height:180px}.review-card h2{font-size:23px;margin-top:11px}.review-card p{font-size:12px;max-width:none;margin-bottom:14px}.review-card .corner-icon{top:22px}.review-card .text-button{font-size:12px;min-height:32px}.metrics{grid-template-columns:repeat(4,1fr);padding:20px 0;margin:10px 0 15px}.metric{padding:0 10px}.metric:first-child{padding-left:1px}.metric .number{font-size:23px}.metric .number small{font-size:10px}.metric .label{font-size:9px;line-height:1.6}.section-label{margin-top:29px;margin-bottom:18px;gap:15px}.section-label h2{font-size:23px}.section-label p{font-size:11px}.section-label>.text-button{font-size:12px;white-space:nowrap}.topic-grid{grid-template-columns:1fr;gap:12px}.topic-card{padding:22px;min-height:175px}.topic-card h3{font-size:18px;margin:13px 0 9px}.topic-card .topic-bottom{padding-top:13px}.resource-note{padding:25px 0;flex-direction:column;align-items:flex-start;gap:10px;font-size:11px}.footer-inner{flex-direction:column;align-items:flex-start;gap:5px}#footer{padding:21px 0 30px}.page-heading{padding:34px 0 26px}.page-heading h1{font-size:34px}.page-heading p{font-size:12px}.search-row{flex-wrap:wrap;gap:10px;margin-bottom:20px}.search-box{min-width:100%}.search-row .button{font-size:12px}.note-row{padding:21px;grid-template-columns:1fr;gap:15px}.note-actions{flex-direction:row;align-items:center;justify-content:flex-end}.note-row h3{font-size:15px}.practice-layout{grid-template-columns:1fr}.sidebar-panel{position:static;order:-1;border-radius:16px;padding:15px}.sidebar-panel h2,.sidebar-panel .legend,.sidebar-panel .side-note{display:none}.question-map{display:flex;gap:7px;overflow:auto}.question-map button{min-width:38px;min-height:40px}.sidebar-panel>.button{margin-top:12px;min-height:35px;padding:7px;font-size:11px}.question-panel{padding:23px 20px;border-radius:20px}.question-heading{margin-bottom:21px}.practice-top{padding:20px 0 16px;gap:10px}.practice-top .text-button{font-size:12px;white-space:nowrap}.practice-context{font-size:10px;max-width:230px}.practice-context strong{font-size:12px;line-height:1.6}.source-html{font-size:16px}.option{padding:12px;gap:12px}.option .source-html{font-size:15px}.question-actions{gap:8px;flex-wrap:wrap}.question-actions .button{min-width:100px;font-size:12px}.question-actions .save-status{width:100%;order:3;text-align:right}.result-hero{padding:35px 5px 20px}.result-hero h1{font-size:30px}.result-stats{gap:28px;margin:25px 0}.result-stat strong{font-size:30px}.result-actions{flex-wrap:wrap}.result-actions .button{font-size:12px}.history-row{align-items:flex-start}.history-row h3{font-size:13px}.history-right{font-size:12px}.chart-card{padding:23px}.day .bar{width:23px}.week-chart{gap:8px}.dialog-head{padding:21px}.dialog-body{padding:21px}.dialog-head h2{font-size:21px}.topic-dialog .dialog-head h2{font-size:18px}.result-line{padding:18px}.result-line strong{font-size:13px}.result-line span{font-size:11px}.self-assess .button{margin-bottom:8px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation:none!important;transition:none!important}.loader{border-color:var(--blue)}}
.grade-select select{border:1px solid #dedee3;border-radius:13px;background:white;padding:11px 13px;min-height:48px;font-size:13px;color:var(--ink)}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.note-row .note-preview{font-size:15px;line-height:1.9}.note-preview img{max-height:65px;width:auto}.note-preview p{margin:0}@media(max-width:760px){.result-count{font-size:10px}.grade-select select{min-height:44px;padding:9px 12px}.search-row{gap:9px}}
.nowrap{white-space:nowrap}@media(max-width:760px){.sidebar-panel{display:grid;grid-template-columns:1fr 1fr;gap:10px}.sidebar-panel .question-map{grid-column:1/-1}.sidebar-panel>.button{margin:0}.sidebar-panel .scratch{margin:0;padding:6px 0 0;border:0}.sidebar-panel .scratch[open]{grid-column:1/-1}.sidebar-panel .scratch summary{min-height:25px}}
.topic-filters{margin:0 0 25px;padding:17px 0 20px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);display:grid;gap:10px}.filter-row{display:flex;align-items:center;gap:20px;min-height:44px}.filter-label{font-size:12px;color:var(--muted);min-width:28px}.filter-buttons{display:flex;gap:8px;flex-wrap:wrap}.filter-chip{min-height:40px;padding:8px 18px;border-radius:22px;font-size:13px;color:var(--muted)}.filter-chip:hover{background:#e7e7ec}.filter-chip.active{background:white;color:var(--ink);box-shadow:0 1px 6px #00000008;font-weight:550}.filter-row[aria-label="数学专题层次"] .filter-chip.active{background:#e1eeff;color:#005bbb;box-shadow:none}.filter-hint{font-size:11px;color:var(--muted);margin-left:auto}@media(max-width:760px){.topic-filters{margin-bottom:20px;padding:12px 0;gap:6px}.filter-row{gap:10px;min-height:44px}.filter-label{font-size:11px;min-width:25px}.filter-buttons{gap:3px}.filter-chip{font-size:12px;min-height:44px;padding:8px 11px}.filter-hint{display:none}}

/* Mathematics work keeps the existing quiet, spacious practice layout. */
.written-work{margin-top:28px}.paper-guide{padding:20px 22px;border-radius:18px;background:var(--bg,#f5f5f7)}.paper-guide strong{font-size:18px}.paper-guide p{font-size:14px;color:var(--muted);line-height:1.7;margin:8px 0 0}.written-work .answer-input{margin-top:20px}.written-work textarea{min-height:110px}.math-preview{overflow-x:auto;max-width:100%;padding:12px 0;line-height:1.9;white-space:normal;overflow-wrap:anywhere}.math-preview:empty{display:none}.photo-work{margin-top:24px;padding-top:20px;border-top:1px solid var(--line,#e5e5e7)}.photo-heading,.photo-actions{display:flex;align-items:center;gap:16px;flex-wrap:wrap}.photo-heading{justify-content:space-between}.photo-heading strong{font-size:14px}.photo-work p,.photo-work small{font-size:12px;color:var(--muted);line-height:1.7}.photo-work small{display:block;margin-top:12px}.photo-picker{position:relative;overflow:hidden;cursor:pointer}.photo-picker input{position:absolute;inset:0;opacity:0;width:100%;cursor:pointer}.photo-picker:focus-within{outline:2px solid #0071e3;outline-offset:4px}.answer-photo{display:block;max-width:100%;max-height:300px;object-fit:contain;border-radius:12px;margin:16px 0}.photo-actions{margin-top:12px}.recognition-warning{background:#fff4d6;padding:14px;border-radius:12px;line-height:1.7}.recognition-dialog textarea{min-height:180px}.recognition-dialog .dialog-body{overflow-wrap:anywhere}math-field{display:block;min-height:72px;padding:14px;font-size:24px;border:1px solid #d2d2d7;border-radius:12px;max-width:100%;--selection-background-color:#d7eaff}body{--keyboard-zindex:10000}.self-assess{display:flex;gap:10px;flex-wrap:wrap}.self-assess p{flex-basis:100%}.math-preview .ML__latex{white-space:nowrap;font-size:20px}@media(max-width:600px){.question-actions{flex-wrap:wrap;gap:16px}.question-actions .button{font-size:13px}.paper-guide{padding:16px}.paper-guide strong{font-size:16px}.photo-actions{gap:12px}}

.ability-controls{display:flex;justify-content:space-between;align-items:center;gap:20px;margin:20px 0 28px;flex-wrap:wrap}.ability-search{display:flex;gap:12px;align-items:center;font-size:12px;color:var(--muted)}.ability-search input{border:1px solid #d2d2d7;border-radius:12px;padding:11px 14px;background:white;max-width:230px;font:inherit}.universe{overflow:hidden;border-radius:26px;background:#082f35;color:#e6f5f2;border:1px solid #254e53;box-shadow:0 24px 60px #082f3515}.universe-top{padding:30px 32px 22px;display:flex;align-items:center;justify-content:space-between;gap:18px}.universe-eyebrow{font-size:12px;letter-spacing:.08em;color:#9ac4c4}.universe-top h2{font-size:25px;letter-spacing:-.03em;margin:9px 0 0}.universe-count{display:flex;align-items:center;gap:12px}.universe-count strong{font-size:32px;font-weight:500}.universe-count span{font-size:11px;color:#a6c4c5;max-width:85px;line-height:1.8}.traffic-legend{display:flex;gap:6px;flex-wrap:wrap;padding:0 28px 22px}.traffic-legend button{border:1px solid transparent;background:transparent;color:#b8ced0;border-radius:9px;padding:9px 10px;display:flex;align-items:center;gap:8px;font:inherit;font-size:12px;cursor:pointer}.traffic-legend button[aria-pressed=true]{background:#ffffff10;border-color:#ffffff20;color:white}.traffic-legend i,.ability-state i,.ability-list i{width:7px;height:7px;border-radius:50%;display:inline-block;flex-shrink:0}.traffic-legend b{font-size:11px;font-weight:500;opacity:.6}.universe-toolbar{border-top:1px solid #ffffff12;border-bottom:1px solid #ffffff12;padding:13px 26px;display:flex;align-items:center;gap:18px;font-size:11px;color:#b8cdce}.universe-toolbar select{border:0;color:#e1edee;font:inherit;background:#123b42;padding:7px;border-radius:6px;max-width:225px}.map-tools{margin-left:auto;display:flex;gap:6px}.map-tools button{background:#ffffff0b;border:1px solid #ffffff1a;border-radius:6px;color:#dff4f0;min-width:30px;height:29px;cursor:pointer}.universe-layout{display:grid;grid-template-columns:minmax(0,1fr) 280px}.universe-stage{position:relative;min-width:0;background:radial-gradient(ellipse at 22% 26%,#60a5fa13,transparent 50%),radial-gradient(ellipse at 78% 72%,#2dd4bf12,transparent 45%),#082f35}.universe-stage:before{content:'';position:absolute;inset:0;pointer-events:none;background:radial-gradient(ellipse at 50% 50%,#b8f5e708,transparent 45%)}#ability-canvas{display:block;width:100%;height:610px;touch-action:none;cursor:grab}#ability-canvas:active{cursor:grabbing}.map-links line{stroke:#75c2be;stroke-opacity:.2;stroke-width:.9}.map-root circle{fill:#1f8d91;stroke:#9adad5;stroke-width:1.4;filter:drop-shadow(0 0 12px #2dd4bf55)}.map-root text{text-anchor:middle;fill:#e5fffa;font-size:14px;font-weight:600}.map-hub circle{fill:#287f7e;stroke:#87c3bb;stroke-width:1.2;filter:drop-shadow(0 0 7px #2dd4bf30)}.map-hub text{text-anchor:middle;fill:#cfede7;font-size:13px;paint-order:stroke;stroke:#082f35;stroke-width:4px}.ability-node{cursor:pointer;outline:none}.node-hit{fill:transparent}.node-halo{fill:none;stroke:var(--node);stroke-opacity:0;stroke-width:1}.node-core{fill:var(--node);stroke:#ffffff60;stroke-width:.7}.has-evidence .node-core{filter:drop-shadow(0 0 5px var(--node))}.ability-node:hover .node-halo,.ability-node:focus .node-halo,.ability-node.selected .node-halo{stroke-opacity:.85}.node-label{font-size:10px;fill:#d1e4e4;text-anchor:middle;paint-order:stroke;stroke:#082f35;stroke-width:3px;display:none;pointer-events:none}.map-zoomed .node-label,.ability-node:hover .node-label,.ability-node:focus .node-label,.ability-node.selected .node-label,.has-evidence .node-label{display:block}.map-empty{fill:#bdd2d2;text-anchor:middle;font-size:18px}.map-hint{position:absolute;bottom:10px;left:0;right:0;text-align:center;font-size:10px;color:#91b2b4;pointer-events:none}.ability-detail{border-left:1px solid #ffffff12;padding:30px 25px;background:#06282f55;min-width:0}.ability-state{display:inline-flex;align-items:center;gap:7px;color:var(--state);font-size:12px}.ability-state i{background:var(--state);box-shadow:0 0 10px var(--state)}.ability-path{font-size:10px!important;color:#9ebbbe!important;margin-top:28px!important}.ability-detail h3{font-size:23px;line-height:1.5;margin:8px 0 16px;overflow-wrap:anywhere}.ability-detail p{font-size:12px;line-height:1.9;color:#bbd0d2;margin:14px 0}.ability-evidence{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:26px 0}.ability-evidence strong{font-size:28px;font-weight:450}.ability-evidence small{font-size:13px;color:#91abad}.ability-evidence span{display:block;font-size:10px;color:#9cb7ba;margin-top:7px}.ability-detail .ability-detail-note{font-size:11px;color:#9eb9bc}.ability-detail .button{width:100%;font-size:12px;margin:10px 0 0;background:#dff7ee;color:#163f3c}.ability-detail .button.secondary{background:#ffffff0b;border-color:#ffffff1a;color:#d5e7e7}.ability-detail .text-button{color:#aacfcf;font-size:11px;margin-top:20px}.universe-foot{display:flex;justify-content:space-between;align-items:center;gap:16px;padding:18px 28px;border-top:1px solid #ffffff12;color:#9cb8bb;font-size:11px}.universe-foot .text-button{color:#bdd7d7;font-size:11px;white-space:nowrap}.ability-list{margin:24px 0;padding:18px 22px;background:white;border-radius:14px;font-size:13px}.ability-list summary{cursor:pointer}.ability-list>div{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;padding-top:22px}.ability-list button{border:1px solid #e5e8e8;background:#fafcfc;border-radius:9px;padding:13px;display:flex;align-items:center;gap:9px;font:inherit;font-size:12px;text-align:left;cursor:pointer}.ability-list small{font-size:10px;margin-left:auto;white-space:nowrap;color:#697c7c}.universe button:focus-visible{outline:2px solid #dbfbf4;outline-offset:3px}@media(max-width:1000px){.universe-layout{grid-template-columns:minmax(0,1fr) 230px}.ability-detail{padding:24px 18px}#ability-canvas{height:580px}.nav-links{gap:20px}}@media(max-width:700px){.universe-top{padding:24px 20px}.universe-top h2{font-size:20px}.universe-count{display:none}.traffic-legend{padding:0 12px 18px;gap:0}.traffic-legend button{font-size:10px;padding:8px}.universe-toolbar{padding:12px;gap:8px;flex-wrap:wrap}.universe-toolbar select{max-width:150px}#map-count{font-size:10px}.universe-layout{display:flex;flex-direction:column}.universe-stage{width:100%}#ability-canvas{height:410px}.ability-detail{border-left:0;border-top:1px solid #ffffff12;padding:22px}.ability-detail h3{font-size:21px;margin-top:6px}.ability-path{margin-top:15px!important}.ability-evidence{margin:18px 0}.universe-foot{padding:16px 20px}.ability-controls{gap:18px}.ability-search{width:100%}.ability-search input{flex:1;max-width:none}.ability-list>div{grid-template-columns:1fr}.ability-detail .button{max-width:100%}.nav-links{gap:21px}.nav-links a{font-size:11px}}

.formula-dialog{max-width:660px;max-height:94vh}#formula-keyboard{height:245px;margin:18px -15px 0;position:relative;border-radius:12px;overflow:hidden}.formula-dialog .dialog-actions{margin-top:18px}@media(max-width:600px){#formula-keyboard{height:245px;margin-inline:-16px}.formula-dialog .dialog-body>p{margin-bottom:14px}}

.map-tools output{align-self:center;min-width:44px;text-align:center;font-size:11px;font-variant-numeric:tabular-nums;color:#d0e7e5}#ability-canvas:focus-visible{outline:2px solid #bfeee4;outline-offset:-3px}

/* Source-linked knowledge network, inspired by the user's relationship-map reference. */
.ability-page .universe{background:#082f35;border:1px solid #254e53;color:#e6f5f2}
.ability-page .universe-stage{background:radial-gradient(ellipse at 22% 26%,#60a5fa13,transparent 50%),radial-gradient(ellipse at 78% 72%,#2dd4bf12,transparent 45%),#082f35}
.ability-page .universe-stage:before{display:block}
.ability-page .universe-layout{grid-template-columns:minmax(0,1fr) 240px}
.ability-page #ability-canvas{height:650px}
.ability-page .map-links line{stroke:#75c2be;stroke-opacity:.27;stroke-width:.8;vector-effect:non-scaling-stroke}
.ability-page .map-hub circle{fill:#3c9692;stroke:none;filter:none}
.ability-page .map-cluster circle{fill:#287f7e}
.ability-page .node-core{stroke:none;filter:none}
.ability-page .node-halo{stroke-width:1.5;vector-effect:non-scaling-stroke}
.ability-page .map-hub text,.ability-page .node-label{display:none;font-size:var(--label-size,14px);font-weight:400;text-anchor:middle;fill:#bdd8d6;stroke:#082f35;stroke-width:3px;paint-order:stroke;pointer-events:none}
.ability-page .map-group text{fill:#e1f5ef}
.ability-page .label-visible,.ability-page .ability-node:hover .node-label,.ability-page .ability-node:focus .node-label{display:block}
.ability-page .ability-node:hover .node-label,.ability-page .ability-node:focus .node-label,.ability-page .ability-node.selected .node-label{fill:#fff}
.ability-page .ability-detail{background:#06282f55;border-color:#ffffff12}
.ability-page .ability-detail p,.ability-page .universe-foot,.ability-page .universe-toolbar,.ability-page .traffic-legend button{color:#b8cdce}
.ability-page .ability-detail .ability-path,.ability-page .ability-detail .ability-detail-note{color:#9ebbbe!important}
.ability-page .ability-detail .button{background:#dff7ee;color:#163f3c}
.ability-page .ability-detail .text-button,.ability-page .universe-foot .text-button{color:#aacfcf}
.ability-page .universe-toolbar select{background:#123b42;color:#e1edee}
.ability-page .universe-eyebrow,.ability-page .universe-count span,.ability-page .map-hint,.ability-page .ability-evidence span,.ability-page .ability-evidence small{color:#9cb7ba}
.ability-page .map-tools button{min-width:36px;height:36px;color:#dff4f0}
.ability-page .universe-foot{border-color:#254e53}
@media(max-width:1000px){
 .ability-page .universe-layout{grid-template-columns:1fr}
 .ability-page #ability-canvas{height:580px}
 .ability-page .ability-detail{border-left:0;border-top:1px solid #ffffff12;display:grid;grid-template-columns:1fr 1fr;gap:0 24px}
 .ability-page .ability-detail .ability-path,.ability-page .ability-detail h3{grid-column:1/-1}
 .ability-page .ability-detail h3{margin:4px 0 8px}
 .ability-page .ability-detail .ability-path{margin:12px 0 0!important}
}
@media(max-width:700px){
 .ability-page #ability-canvas{height:460px}
 .ability-page .ability-detail{display:block}
 .ability-page .map-tools button{min-width:44px;height:44px}
 .ability-page .map-tools{align-items:center}
 .ability-page .universe-toolbar{gap:10px}
 .ability-page .traffic-legend button{min-height:44px}
}
.ability-page .map-hub text.label-visible{display:block}

.reference-entry{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin:22px 0}.reference-entry small{color:var(--muted);font-size:12px}.reference-feedback{scroll-margin-top:100px}

.mastery-records{margin:30px 0}.mastery-row{background:white;border-radius:16px;padding:22px;margin:12px 0;display:grid;grid-template-columns:minmax(0,1fr) auto;gap:22px;align-items:center}.mastery-row p{font-size:14px;line-height:1.8;margin:8px 0;overflow-wrap:anywhere}.mastery-row small,.mastery-row .muted{font-size:11px;color:var(--muted)}.mastery-actions{display:flex;flex-direction:column;align-items:flex-end;gap:10px}.mastery-actions button{min-height:44px}.manual-mastery-evidence{border:1px solid #ffffff20;border-radius:10px;padding:13px;margin:18px 0}.manual-mastery-evidence strong,.manual-mastery-evidence span,.manual-mastery-evidence a{display:block;font-size:11px;line-height:1.8}.manual-mastery-evidence span{color:#acc7c8}.manual-mastery-evidence a{color:#d9eee9;margin-top:6px}@media(max-width:700px){.mastery-row{grid-template-columns:1fr}.mastery-actions{flex-direction:row;align-items:center;justify-content:space-between}.reference-feedback{scroll-margin-top:130px}}

/* Individual evidence stays next to its source subquestion. */
.part-work{margin:28px 0;padding:24px;border:1px solid var(--line,#ddd);border-radius:18px;min-width:0;background:var(--surface,#fff)}
.part-work h3{font-size:17px;margin:0 0 18px}.part-work .options{margin:16px 0}.part-feedback{margin-top:16px;color:var(--muted)}.part-reference{margin-top:18px}.part-reference summary{cursor:pointer;padding:8px 0}.part-reference .source-html{margin-top:10px}
.listening-work{padding:20px;margin:20px 0;border:1px solid var(--line,#ddd);border-radius:16px;display:grid;gap:12px}.listening-work audio,.source-html audio{width:100%;max-width:100%;display:block}.listening-work small{color:var(--muted);line-height:1.6}
@media(max-width:600px){.part-work{padding:16px 12px}.part-work .self-assess{display:flex;flex-wrap:wrap;gap:8px}.part-work .button{white-space:normal}}
/* Student review: keep source material and the active subquestion within reach. */
.learning-scope{display:flex;align-items:center;justify-content:space-between;gap:20px;margin:0 0 24px;padding:18px 22px;background:white;border-radius:16px}.learning-scope strong{font-size:15px}.learning-scope span{font-size:12px;color:var(--muted);margin-left:12px}.learning-scope p{font-size:12px;color:var(--muted);margin:8px 0 0}.learning-scope button{flex-shrink:0}
.compound-layout{grid-template-columns:minmax(0,1fr)}.compound-layout>.sidebar-panel{position:static;order:-1;padding:14px 20px;display:flex;align-items:center;gap:18px}.compound-layout>.sidebar-panel h2,.compound-layout>.sidebar-panel .legend,.compound-layout>.sidebar-panel .side-note,.compound-layout>.sidebar-panel .scratch{display:none}.compound-layout>.sidebar-panel>.button{width:auto;margin:0 0 0 auto}.compound-layout .question-map{display:flex;overflow:auto;gap:8px}.compound-layout .question-map button{min-width:38px}.compound-layout .question-panel{padding:26px}
.reading-work{scroll-margin-top:110px;border:1px solid var(--line);border-radius:16px;overflow:hidden}.reading-tabs{display:none}.part-nav{display:flex;gap:8px;overflow:auto;padding:12px;background:#f7f8fb;border-bottom:1px solid var(--line)}.part-nav button{white-space:nowrap;min-height:44px;padding:8px 14px;border-radius:10px;font-size:12px}.part-nav button[aria-pressed=true],.reading-tabs button[aria-pressed=true]{background:#e7f0ff;color:var(--blue)}.reading-columns{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr)}.reading-material,.reading-tasks{height:min(68vh,720px);overflow:auto;min-width:0;overscroll-behavior:contain;padding:22px}.reading-material{border-right:1px solid var(--line);background:#fcfcfd}.reading-tasks .part-work{margin:0;border:0;padding:0;scroll-margin-top:20px}.part-work[hidden]{display:none}.part-actions{display:flex;gap:16px;align-items:center;flex-wrap:wrap;margin-top:18px}.part-error{color:#ae2929;font-size:13px;line-height:1.7}.original-reference{margin-top:20px;font-size:13px}.original-reference summary{cursor:pointer;padding:12px 0}.original-reference .source-html{padding-top:14px}.reading-tasks .part-reference{padding:14px;background:#f5f7fb;border-radius:12px}.reading-tasks .part-feedback{padding-bottom:20px}.reading-tasks .source-html{overflow-wrap:anywhere}.part-work:focus-visible{outline:2px solid var(--blue);outline-offset:-2px}
@media(max-width:900px){.compound-layout .question-panel{padding:20px}.reading-tabs{display:flex;padding:8px;border-bottom:1px solid var(--line);gap:8px}.reading-tabs button{flex:1;min-height:44px;border-radius:10px;font-size:13px}.reading-columns{display:block}.reading-material,.reading-tasks{height:58dvh;padding:18px;border:0}.reading-work[data-view=material] .reading-tasks,.reading-work[data-view=tasks] .reading-material{display:none}.reading-work[data-view=material] .part-nav{display:none}.reading-work{scroll-margin-top:115px}.compound-layout>.sidebar-panel{flex-wrap:wrap;gap:10px}.compound-layout>.sidebar-panel>.button{font-size:11px}.learning-scope{align-items:flex-start;padding:16px;gap:12px}.learning-scope span{display:block;margin:6px 0}.learning-scope button{font-size:12px}}

/* Guangdong exam practice: reuses the existing blue/neutral theme. */
.regional-scope{padding:28px 30px;border:1px solid var(--line,#e5e7eb);background:#f5f8fc;border-radius:24px;margin:22px 0}.regional-scope h2{font-size:24px;margin:12px 0}.regional-scope p{color:#626b78;line-height:1.8;font-size:14px}.regional-scope .filter-buttons{margin:20px 0;flex-wrap:wrap}.regional-coverage{max-width:860px}.regional-scope details{font-size:13px;color:#626b78}.regional-scope summary{cursor:pointer}.regional-home{display:flex;justify-content:space-between;align-items:center;gap:20px;background:#f5f8fc;border-radius:20px;padding:24px;margin-bottom:20px}.regional-home p{color:#626b78;font-size:14px;margin:8px 0 0}.empty .filter-buttons{justify-content:center;flex-wrap:wrap}.topic-card .pill{white-space:nowrap}@media(max-width:640px){.regional-scope{padding:22px 18px}.regional-scope h2{font-size:21px}.regional-home{align-items:flex-start;flex-direction:column;padding:20px}.regional-scope .filter-chip{padding:9px 12px}}
.practice-mode{display:flex;justify-content:space-between;align-items:center;gap:16px;margin:12px 0 24px;color:var(--muted,#6e6e73);font-size:13px}.practice-mode .text-button{flex-shrink:0}@media(max-width:640px){.practice-mode{align-items:flex-start;flex-wrap:wrap;gap:8px}}
.source-formula{display:inline-block;max-width:100%;overflow-x:auto;vertical-align:middle;overflow-wrap:normal}
/* Preparation directions stay compact; collection names are kept on questions. */
.practice-mode{gap:16px;flex-wrap:wrap}.practice-mode .filter-buttons{display:flex;gap:8px;flex-wrap:wrap}.practice-mode label{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--muted,#6e6e73)}.practice-mode select{font:inherit;padding:8px 10px;border:1px solid #d2d2d7;border-radius:10px;background:white;color:#1d1d1f}

/* Student-first task flow: shared light theme and existing teal map are retained. */
.page-heading{padding-top:30px;margin-bottom:24px}.page-heading h1{font-size:34px;line-height:1.2;letter-spacing:-.035em;margin:0 0 10px}.page-heading p{font-size:14px;line-height:1.7;margin:0;color:var(--muted)}
.home-page .subject-bar{margin:22px 0}.today-task{display:grid;grid-template-columns:1fr 170px;gap:30px;align-items:center;background:white;border-radius:26px;padding:34px 40px}.task-label{font-size:13px;color:var(--muted)}.today-task h2{font-size:30px;letter-spacing:-.025em;margin:14px 0}.today-task p{font-size:14px;line-height:1.8;color:var(--muted);max-width:440px;margin:0 0 24px}.today-task .progress-ring{width:168px;height:168px}.today-links{display:flex;gap:24px;margin:18px 4px;flex-wrap:wrap}.today-links a{display:inline-flex;gap:6px;align-items:center;font-size:14px;color:var(--blue)}.recent-practice{margin-top:30px}.recent-practice h2,.results-list h2{font-size:20px}.compact-note{font-size:12px;color:var(--muted);line-height:1.8;margin:14px 0}.compact-note summary{cursor:pointer;min-height:36px;display:list-item;align-content:center}.compact-note p{max-width:780px;margin:8px 0}.history-row{flex-wrap:wrap;gap:16px}.history-row h3{font-size:15px}.history-row p{font-size:12px}.record-evidence{flex-basis:100%;border-top:1px solid var(--line);padding-top:14px}.record-evidence summary,.record-stats summary{font-size:14px;cursor:pointer;min-height:44px;align-content:center}.record-stats{margin-bottom:20px}.record-list .history-row{background:white;border-radius:18px;padding:22px;margin-bottom:12px}.mastery-records{border:0;margin:0;padding:0}.mastery-row p{font-size:13px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.mastery-row{gap:16px}.mastery-actions{flex-shrink:0}
.practice-filters{display:flex;justify-content:space-between;gap:18px;align-items:flex-start;margin:12px 0 22px}.practice-filters label{display:flex;align-items:center;gap:12px;font-size:13px;color:var(--muted)}.practice-filters select{background:white;border:1px solid #d2d2d7;border-radius:10px;padding:11px;font:inherit;color:var(--ink);min-height:44px;max-width:100%}.more-filters{min-width:120px;max-width:420px}.more-filters summary{font-size:13px;min-height:44px;cursor:pointer;align-content:center;color:var(--blue)}.more-filter-body{background:white;border-radius:16px;padding:20px;display:grid;gap:16px;margin-top:6px}.more-filter-body p{font-size:12px;line-height:1.8;color:var(--muted);margin:0}.more-filter-body .check-field{justify-content:flex-start;line-height:1.6}.check-field input[type=checkbox]{width:18px;height:18px;flex-shrink:0}.filter-summary{font-size:13px;color:var(--muted);line-height:44px}.optional-settings{margin:20px 0}.optional-settings summary,.optional-input summary,.optional-photo summary{font-size:13px;line-height:1.7;min-height:44px;align-content:center;cursor:pointer;color:var(--blue)}.optional-settings .field{margin-top:16px}.optional-input,.optional-photo{margin:14px 0}.optional-photo .photo-work{margin-top:0}.optional-input .answer-input{margin-top:8px}.part-paper-first{margin-top:14px}.part-feedback .button{margin-top:16px}.result-hero h1{font-size:34px}.result-stat small{font-size:15px;color:var(--muted)}.result-hero{padding:40px 0 30px}.result-actions{margin-top:22px}.finish-secondary{font-size:12px!important}.question-tools .text-button{white-space:nowrap}.reading-tabs button,.filter-chip,.note-actions .text-button{min-height:44px}.source-meta{overflow-wrap:anywhere}.record-evidence .mastery-row{align-items:start}.record-evidence .mastery-actions{display:flex;flex-wrap:wrap}
.ability-intro{margin:16px 0 24px;background:white;border-radius:20px;padding:24px}.ability-intro h2{font-size:20px;margin:0 0 10px}.ability-intro p{font-size:14px;color:var(--muted);line-height:1.7}.ability-intro .focus-nodes{display:flex;gap:12px;flex-wrap:wrap}.focus-nodes button{min-height:44px;padding:12px 16px;border:1px solid var(--line);border-radius:12px;color:var(--ink);background:white}.universe-disclosure>summary{font-size:16px;padding:16px 0;cursor:pointer;color:var(--blue)}.universe-disclosure[open]>summary{margin-bottom:8px}.map-explanation{margin:16px 0;color:var(--muted);font-size:12px;line-height:1.8}
@media(max-width:760px){.page-heading{padding-top:20px;margin-bottom:18px}.page-heading h1{font-size:28px}.home-page .subject-bar{margin:18px 0}.today-task{padding:24px;gap:16px;grid-template-columns:1fr}.today-task h2{font-size:26px;margin:10px 0}.today-task p{font-size:13px;margin-bottom:18px}.today-task .progress-ring{display:none}.today-task:after{content:attr(data-progress)}.today-links{font-size:13px;gap:16px}.recent-practice{margin-top:24px}.history-row{padding:16px 0}.practice-filters{flex-wrap:wrap;gap:10px}.practice-filters>label{flex:1}.more-filters[open]{flex-basis:100%;max-width:none}.practice-filters select{font-size:16px}.search-row{gap:12px}.result-hero{padding:24px 0}.result-hero h1{font-size:28px}.result-stats{gap:10px}.result-stat strong{font-size:28px}.result-stat span{font-size:12px}.result-actions{gap:16px}.mastery-row{flex-direction:column}.mastery-actions{flex-shrink:1}.ability-intro{padding:20px}.nav-links{justify-content:space-between;gap:12px;width:100%}.nav-links a{font-size:12px;min-height:44px;align-content:center}.record-list .history-row{padding:18px}.sidebar-panel .finish-secondary{grid-column:1/-1;justify-self:end}.reading-work .reading-material,.reading-work .reading-tasks{max-height:65vh}}
.mobile-progress{display:none}@media(max-width:760px){.today-task .mobile-progress{display:block;margin:0 0 14px;font-size:12px;color:var(--muted)}}

/* Each fill slot follows prompt order and keeps a separate saved answer. */
.blank-inputs{margin:20px 0}.blank-field{display:grid;grid-template-columns:auto minmax(0,1fr);gap:8px 12px;align-items:center;margin:14px 0}.blank-field label{font-size:14px;font-weight:600}.blank-field input{width:100%;min-width:0;min-height:44px;border:1px solid var(--line);border-radius:10px;padding:10px 12px;font:inherit;font-size:16px;background:white}.blank-field .text-button,.blank-field .math-preview,.blank-result{grid-column:2}.blank-field .math-preview:empty{display:none}.blank-result{font-size:13px}.blank-result.correct{color:#14734d}.blank-result.incorrect{color:#ad2929}.part-reference h4{margin:12px 0 6px}.reference-dialog{max-width:760px}.reference-dialog .source-html{overflow-wrap:anywhere}.reference-dialog .source-html img{max-width:100%;height:auto}

/* Inline answers: one field, optional symbols, no formula insertion dialog. */
.blank-field.single-blank{grid-template-columns:minmax(0,1fr)}
.blank-field.single-blank .blank-result{grid-column:1}
.blank-editor{min-width:0;position:relative}
.blank-editor math-field{display:block;width:100%;min-width:0;min-height:52px;padding:10px 12px;border:1px solid var(--line);border-radius:12px;background:#fff;font-size:20px;--caret-color:var(--blue);--selection-background-color:#dcecff;--contains-highlight-background-color:#eaf3ff}
.blank-editor math-field:focus-within{outline:2px solid #0071e344;outline-offset:1px;border-color:#0071e3}
.blank-editor math-field[read-only]{background:#f7f8fa}
.blank-editor math-field::part(virtual-keyboard-toggle),.blank-editor math-field::part(menu-toggle){display:none}
.math-tools{display:none;flex-wrap:wrap;gap:6px;padding:4px 0 8px}.blank-inputs.editing .math-tools{display:flex}
.math-tools button{border:0;border-radius:8px;background:#f3f4f6;color:#42464d;padding:8px 12px;min-height:40px;font:inherit;font-size:13px;cursor:pointer}
.math-tools button:hover,.math-tools button:focus-visible{background:#e6effb;color:#0066cc}
.blank-inputs.text-answer .math-tools [data-action="math-key"],.blank-inputs.text-answer .math-tools [data-action="math-keyboard"]{display:none}
@media(pointer:coarse){.math-tools [data-action="math-key"],.math-tools [data-action="math-keyboard"]{display:none}}

/* Focused task, review and input fixes; keep the existing visual system. */
#operation-status{position:fixed;left:50%;top:14px;transform:translateX(-50%);z-index:1200;max-width:calc(100vw - 32px);padding:12px 20px;border:1px solid #d9e3ee;border-radius:14px;background:#fffffff5;box-shadow:0 6px 28px #152f491c;color:#28496a;font-size:14px;pointer-events:none}
#operation-status[hidden]{display:none}
.topic-start{display:inline-flex;align-items:center;justify-content:space-between;gap:18px;min-height:44px;padding:10px 15px;border-radius:12px;background:#f5f5f7;color:var(--ink);font-size:13px;cursor:pointer}
.topic-start:hover,.topic-start:focus-visible{background:#e9f2fc;color:var(--blue)}
.blank-field textarea{width:100%;min-width:0;min-height:108px;resize:vertical;overflow:hidden;border:1px solid var(--line);border-radius:12px;padding:12px;font:inherit;font-size:16px;line-height:1.8;background:white}
.blank-field textarea:focus,.blank-field input:focus{outline:2px solid #0071e344;outline-offset:1px;border-color:var(--blue)}
textarea[data-autogrow]{overflow:hidden;min-height:108px}
.math-answer-readonly{min-height:44px;border:1px solid var(--line);border-radius:12px;background:#f7f8fa;padding:10px 12px;white-space:pre-wrap;overflow-wrap:anywhere}
.math-load-error{font-size:12px;line-height:1.6;color:#875600}.math-load-error:empty{display:none}
.context-only-note,.upgrade-notice,.review-scope{padding:12px 14px;background:#f4f7fb;border-radius:12px;color:#566372;font-size:13px;line-height:1.8;margin:12px 0}
.upgrade-notice p{margin:0 0 10px}.review-scope{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.part-nav button{border:1px solid transparent}.part-nav button[aria-pressed=true]{border-color:#b6d2f2}
.part-feedback>strong{display:block;margin-bottom:12px}.part-feedback .self-assess{margin-top:12px}
@media(max-width:900px){
 .reading-work .reading-material,.reading-work .reading-tasks{height:auto;max-height:none;overflow:visible;overscroll-behavior:auto;padding:16px}
 .reading-work{scroll-margin-top:114px}
 .part-nav{padding:8px;gap:5px}.part-nav button{padding:8px 10px;min-height:42px;font-size:12px}
 .part-actions{gap:10px;margin-top:16px}.part-actions .button,.part-actions .text-button{min-height:44px}
 .reading-tasks .part-work>h3{font-size:14px;margin:0 0 10px}.reading-tabs{padding:5px}
}
@media(max-width:760px){
 .practice-top{padding:12px 0;align-items:center}.practice-context{font-size:0;max-width:55%}.practice-context strong{font-size:11px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
 .practice-layout{gap:10px}.compound-layout>.sidebar-panel{padding:9px 12px;display:flex;align-items:center;gap:10px}.compound-layout>.sidebar-panel .question-map{flex:1}.compound-layout>.sidebar-panel .scratch{display:none}.compound-layout>.sidebar-panel .finish-secondary{margin:0;white-space:nowrap;min-height:40px}
 .compound-layout .question-panel{padding:16px 12px}.compound-layout .question-heading{margin-bottom:8px;gap:8px}.compound-layout .question-heading .counter{font-size:11px}.compound-layout .question-heading .counter strong{font-size:18px}.compound-layout .question-tools .text-button{font-size:11px;min-height:40px}.compound-layout .question-tools .icon-button{min-width:36px;min-height:36px}.compound-layout .question-type{margin-bottom:10px;font-size:10px}
 .reading-tabs button{min-height:40px}.part-actions{display:grid;grid-template-columns:1fr 1fr}.part-actions .button{grid-column:1/-1}.part-actions .text-button{justify-content:center;font-size:12px}.reading-tasks .self-assess{padding:12px}.reading-tasks .self-assess .button{margin-right:4px;padding:9px 11px;min-height:44px}
 .source-meta{margin-top:18px;padding-top:12px}.question-actions{padding-top:14px}.topic-start{min-height:46px;padding:11px 16px}
 #operation-status{top:auto;bottom:18px;font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
}

.previous-draft pre{white-space:pre-wrap;overflow-wrap:anywhere;font:inherit;line-height:1.8}