@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;450;500;550;600;650;700&family=Libre+Caslon+Display&family=Noto+Sans+SC:wght@400;500;600&display=swap');

:root{--paper:#faf9f6;--surface:#fff;--ink:#263e39;--muted:#7a847e;--teal:#16776b;--teal-dark:#105c52;--teal-soft:#eaf3ef;--border:#e6e8e1;--serif:'Libre Caslon Display',Georgia,serif;--sans:'DM Sans','Noto Sans SC','Segoe UI',sans-serif;--zh:'Noto Sans SC','Microsoft YaHei',sans-serif}
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@media(min-width:1500px){main{padding-top:44px}.hero{min-height:355px}.hero-copy{padding:43px}.hero h1{font-size:59px}.hero-copy>p{font-size:13px;max-width:390px}.hero-art{min-height:355px}.tile-one{left:55px;top:51px;width:145px;height:185px}.tile-two{left:188px;top:82px;width:145px;height:185px}.art-caption{left:150px}.character-tile>span{font-size:90px}.hero-copy .button{font-size:12px}.card-body h3{font-size:14px}.pattern-preview{font-size:12px}.card-example>small{font-size:11px}.card-example>p{font-size:22px}.learned-button,.text-button{font-size:10px}.topic-label{font-size:9px}.card-body h3{min-height:42px}.rule-card{padding:19px 23px 0}}
@media(max-width:1200px){.sidebar{width:225px;padding-left:14px;padding-right:14px}.workspace{width:calc(100% - 225px);margin-left:225px}.topbar{padding:0 30px}main{padding:28px 30px 45px}.hero-copy{padding:30px 26px}.hero h1{font-size:44px}.hero{grid-template-columns:1.15fr 1fr}.character-tile{width:105px;height:146px}.tile-one{left:5px;top:58px}.tile-two{left:97px;top:84px}.character-tile>span{font-size:67px}.art-caption{left:51px;bottom:35px}.stats-strip>div{padding:0 15px;gap:10px}.stats-strip .stat-note{padding:0 13px;gap:9px}.stat-note p{font-size:9px}.rules-grid{gap:13px}.rule-card{padding:14px 14px 0}.card-body h3{font-size:11px}.pattern-preview{font-size:9px}.display-options{gap:10px}footer{padding:24px 30px}.backup-panel{flex-direction:column;align-items:flex-start}.new-collection label{display:none}}
@media(max-width:1000px){.sidebar{width:205px}.workspace{width:calc(100% - 205px);margin-left:205px}.brand{gap:8px;margin-left:1px}.brand strong{font-size:12px}.brand small{font-size:8px;letter-spacing:1.5px}.brand-mark{width:34px;height:39px}.hero{grid-template-columns:1.3fr .8fr}.hero-copy{padding:29px 24px}.hero h1{font-size:43px}.hero-art{opacity:.9}.character-tile{width:94px;height:130px}.tile-one{left:-5px;top:68px}.tile-two{left:57px;top:110px}.character-tile>span{font-size:57px}.character-tile>small{font-size:7px}.art-caption{display:none}.stats-strip{grid-template-columns:1fr 1fr 1fr}.stats-strip>div:nth-child(3){border:0}.stats-strip .stat-note{display:none}.rules-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.card-body h3{font-size:13px}.pattern-preview{font-size:11px}.card-example>small{font-size:10px}.card-example>p{font-size:21px}.card-body h3{min-height:39px}.teacher-grid{grid-template-columns:1fr}.workbook-guide{padding:25px}.new-collection{flex-wrap:wrap}.new-collection input{min-width:170px}.section-title{gap:10px}.section-title h2{font-size:27px}.display-options>span{display:none}.breadcrumb{gap:10px}.local-badge{font-size:8px}.page-heading h1{font-size:45px}}
@media(max-width:760px){.app-shell{display:block}.sidebar{position:static;width:100%;padding:17px 20px 13px;border-right:0;border-bottom:1px solid var(--border);display:block;overflow:visible}.brand{margin:0 0 18px;gap:10px}.brand strong{font-size:15px}.brand small{font-size:8px;letter-spacing:2px}.brand-mark{width:37px;height:40px}.sidebar>.sidebar-label,.sidebar-bottom,.wordcards-link,.collection-heading{display:none}.sidebar>nav:first-of-type{display:grid;grid-template-columns:1.2fr .85fr 1.25fr;gap:5px}.nav-item{font-size:10px;padding:10px 7px;gap:7px;justify-content:center;min-height:40px}.nav-item>.icon{width:16px;height:16px}.new-label{display:none}.collection-list{display:flex;flex-direction:row;overflow-x:auto;margin-top:13px;gap:7px;padding-bottom:4px}.collection{font-size:10px;border:1px solid #e0e6d8;flex-shrink:0;max-width:220px;padding:7px 10px;min-height:32px}.collection>span{display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.collection>span>.icon{margin-right:7px;width:12px;height:12px}.collection-dot{display:none}.collection b{font-size:8px;padding:2px 5px}.workspace{width:100%;margin:0}.topbar{height:50px;padding:0 22px}.breadcrumb{font-size:9px}.local-badge{font-size:8px}.local-badge i{width:4px;height:4px}main{padding:22px 20px 40px}.hero{min-height:270px;grid-template-columns:1.25fr .75fr;border-radius:10px}.hero-copy{padding:26px 23px}.eyebrow{font-size:7px;letter-spacing:1.6px}.hero h1{font-size:42px;margin:17px 0}.hero-copy>p{font-size:10px;max-width:240px}.hero-art{min-height:270px}.character-tile{width:88px;height:121px}.tile-one{top:60px;left:4px}.tile-two{top:96px;left:69px}.art-orbit{inset:30px -20px 40px -25px}.art-speck.one{top:22px;left:89px;font-size:17px}.art-speck.two{top:216px;left:15px}.hero .button{font-size:10px;margin-top:17px;padding:9px 11px;min-height:35px}.stats-strip{margin:17px 0 30px;padding:18px 0}.stats-strip>div{padding:0 15px;gap:12px}.stats-strip>div>.icon{width:18px;height:18px}.stats-strip strong{font-size:21px}.stats-strip small{font-size:8px}.section-title h2{font-size:29px}.display-options{font-size:10px}.search-row{gap:9px}.search-row>select{max-width:125px;padding-left:9px;font-size:10px}.search-box{padding:0 10px;gap:8px}.search-box input{font-size:10px}.search-box kbd{display:none}.topic-chips{gap:5px;margin-top:11px}.chip{font-size:8px;padding:6px 8px;min-height:27px}.results-meta{margin-top:20px;font-size:8px}.results-meta>span:last-child{display:none}.rules-grid{gap:12px}.rule-card{padding:14px 14px 0}.card-body h3{font-size:12px}.pattern-preview{font-size:10px;padding:8px;margin-bottom:12px}.card-example>p{font-size:19px}.card-example>small{font-size:9px}.card-example{min-height:95px;padding-bottom:16px}.card-bottom{padding:9px 0}.learned-button,.text-button{font-size:8px}.topic-label{font-size:7px;letter-spacing:.8px}.page-heading h1{font-size:43px}.page-heading p{font-size:11px}.teacher-grid{gap:16px}.panel{padding:23px}.new-collection input{font-size:10px}.new-collection .button{font-size:10px;padding:10px 12px}.managed-collection{gap:10px}.managed-name strong{font-size:11px}.collection-controls{gap:0}.collection-controls .icon-button{width:28px}.rename-field{flex-wrap:wrap}.backup-panel{gap:18px}.backup-panel h2{font-size:26px}.practice-setup{padding:30px 20px;margin-top:25px}.practice-setup h2{font-size:31px}.practice-setup>p{font-size:11px}.quiz-card{padding:25px 22px}.quiz-card h3{font-size:21px}.quiz-header .topic-label{font-size:7px}.quiz-header .display-options{gap:10px;font-size:9px}.answer-option{padding:14px 12px;gap:10px}.answer-option>strong{font-size:19px}.quiz-actions>span{font-size:9px}.quiz-complete{margin-top:20px;padding:20px 5px}.quiz-complete h1{font-size:36px}footer{padding:22px 20px;font-size:8px}footer>span:last-child{display:none}.modal-overlay{padding:16px}.rule-dialog{padding:22px;max-height:92vh}.rule-dialog h2{font-size:30px}.detail-pattern{font-size:16px;padding:17px}.detail-example [lang=zh]{font-size:23px}.detail-actions{flex-wrap:wrap}.detail-actions .button{flex:1}.notice{font-size:11px}}
@media(max-width:450px){.hero{grid-template-columns:1fr;min-height:275px}.hero-copy{padding:25px 22px;width:80%}.hero h1{font-size:39px;letter-spacing:-1.5px;position:relative;z-index:1}.hero-copy>p{max-width:215px;font-size:10px}.hero-art{position:absolute;right:-34px;top:69px;width:100px;min-height:210px;opacity:.6}.tile-one{width:75px;height:104px;left:0;top:28px}.tile-two{width:75px;height:104px;left:0;top:81px;transform:rotate(13deg)}.character-tile>span{font-size:46px}.character-tile>small{font-size:6px;margin-top:6px}.art-orbit,.art-speck{display:none}.stats-strip>div{gap:9px;padding:0 11px}.stats-strip>div>.icon{width:15px;height:15px}.stats-strip strong{font-size:19px}.stats-strip small{font-size:7px}.stats-strip strong i{font-size:10px}.section-title{align-items:flex-end}.section-title h2{font-size:27px}.section-title .eyebrow{font-size:7px;letter-spacing:1.3px}.display-options{font-size:9px;gap:9px}.display-options input{width:12px;height:12px}.rules-grid{grid-template-columns:1fr}.rule-card{padding:16px 20px 0}.card-body h3{font-size:15px;min-height:0}.pattern-preview{font-size:12px;margin:14px 0}.card-example{min-height:95px}.card-example>p{font-size:24px}.card-example>small{font-size:11px}.topic-label{font-size:8px}.card-bottom{padding:11px 0}.learned-button,.text-button{font-size:10px}.card-top .icon-button{width:28px;height:28px}.card-top .icon-button .icon{width:16px;height:16px}.new-collection input{flex-basis:100%}.new-collection .button{width:100%}.managed-name{flex-basis:100px}.collection-controls .icon-button{width:25px}.managed-collection{gap:8px}.collection-index{font-size:9px}.quiz-header{flex-wrap:wrap}.answer-options{gap:10px}.answer-option{padding:13px 10px;gap:8px}.quiz-actions{gap:10px}.quiz-actions .button{font-size:10px}.quiz-actions>span{font-size:8px}.local-badge{font-size:7px;gap:5px}.breadcrumb{gap:8px;font-size:8px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{transition:none!important;animation:none!important;scroll-behavior:auto!important}}

/* Reading sizes and contrast for long study sessions. */
.hanzi-reading{ruby-position:under;ruby-align:center;white-space:nowrap;margin-inline:.09em;line-height:1.5}
.hanzi-reading rt{font:400 11px/1.5 var(--sans);color:#6c805b;text-transform:none;letter-spacing:0;user-select:none}
.explanation-zh:has(.hanzi-reading),.detail-explanation:has(.hanzi-reading),.rule-note p:has(.hanzi-reading),.answer-feedback p:has(.hanzi-reading){line-height:3.1}
.detail-pattern:has(.hanzi-reading),.pattern-preview:has(.hanzi-reading){line-height:2.6}
.rule-card h3:has(.hanzi-reading),#rule-title:has(.hanzi-reading){line-height:1.85}
.rule-card h3 .hanzi-reading rt{font-size:10px}
.quiz-rule-label:has(.hanzi-reading){display:inline-block;line-height:2.6}
.nav-item{font-size:13px}.collection{font-size:12px}.breadcrumb{font-size:11px}.local-badge{font-size:10px}.sidebar-label{font-size:10px;color:#707f6b}.eyebrow{font-size:10px}.eyebrow.muted{font-size:9px;color:#77856d}.hero-copy>p{font-size:13px;color:#65765f}.button{font-size:12px}.stats-strip small{font-size:11px;color:#75836c}.display-options{font-size:12px;color:#617456}.search-box input{font-size:12px}.chip{font-size:10px;color:#687b5d}.results-meta{font-size:11px;color:#75846b}.card-body h3{font-size:14px}.pattern-preview{font-size:12px;color:#52734e}.card-example>small{font-size:11px}.pinyin,.card-example .pinyin{color:#6c805b}.english,.card-example .english{color:#6f7e63}.topic-label{font-size:9px;color:#71865f}.card-example>p{font-size:22px}.learned-button,.text-button{font-size:10px;color:#607953}.panel p,.page-heading p{font-size:13px;color:#6d7e61}.guide-step p{font-size:12px}.guide-step strong{font-size:14px}.subtle,.collections-panel>.subtle{font-size:11px;color:#74856a}.managed-name strong{font-size:13px}.managed-name small{font-size:11px;color:#788b6c}.practice-setup>p{font-size:13px;color:#718763}.practice-setup>small{font-size:11px;color:#7d8d70}.upload-zone strong{font-size:13px}.upload-zone small{font-size:11px;color:#788e68}.import-help{font-size:11px;color:#728769}.template-link{font-size:12px}.detail-explanation,.explanation-zh{color:#637a57}.detail-example .pinyin,.detail-example .english{font-size:13px}.quiz-rule-label{font-size:12px;color:#718561}.quiz-actions>span{font-size:11px;color:#7c8d6f}.session-select{font-size:12px;color:#6d825f}.local-badge{color:#6d7c65}.rule-dialog .display-options{font-size:12px}
.syllabus-panel{margin-top:24px}.syllabus-collections{display:grid;gap:0;margin-top:20px}.syllabus-collection{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:16px 0;border-top:1px solid var(--line,#dce3d5)}.syllabus-collection strong,.syllabus-collection small{display:block}.syllabus-collection small{margin-top:4px;color:#6d7e61}.syllabus-collection .template-link{margin:0}.preview-rules{max-height:320px;overflow:auto;margin:16px 0;border-top:1px solid #dce3d5}.preview-rules details{padding:12px 4px;border-bottom:1px solid #dce3d5}.preview-rules summary{cursor:pointer;font-size:13px;overflow-wrap:anywhere}.preview-rules small{display:block;overflow-wrap:anywhere;color:#6d7e61}.import-preview>div:first-child{min-width:0;flex:1}.syllabus-panel>p{max-width:850px}
@media(max-width:760px){.syllabus-collection{align-items:flex-start;flex-direction:column}.syllabus-collection .button-row{flex-wrap:wrap;gap:12px}.syllabus-panel h2{font-size:23px}}
dialog.modal-overlay{border:0;color:var(--ink);width:100%;max-width:none;height:100%;max-height:none;background:transparent;margin:0;backdrop-filter:none;overflow:auto}dialog.modal-overlay:not([open]){display:none}dialog.modal-overlay[open]{display:flex}dialog.modal-overlay::backdrop{background:#1d392d70;backdrop-filter:blur(4px)}.rule-dialog{margin:auto}.rule-dialog:focus{outline:none}body:has(dialog[open]){overflow:hidden}
@media(max-width:760px){.nav-item{font-size:11px}.collection{font-size:11px}.breadcrumb{font-size:10px}.local-badge{font-size:9px}.hero-copy>p{font-size:12px}.hero .button{font-size:11px}.stats-strip small{font-size:10px}.display-options{font-size:11px}.search-box input{font-size:11px}.chip{font-size:10px}.topic-label{font-size:9px}.panel p,.page-heading p{font-size:12px}.hero .eyebrow{font-size:8px}.card-body h3{font-size:14px}.card-example>small{font-size:11px}.learned-button,.text-button{font-size:10px}.hero-art{opacity:.85}.rule-dialog .button{font-size:11px}}
@media(max-width:450px){.hero-copy{width:100%;padding:25px 22px}.hero h1{font-size:38px;max-width:275px}.hero-copy>p{max-width:235px;font-size:11px}.hero-art{right:-45px;top:84px;opacity:.4}.hero .eyebrow{font-size:8px;letter-spacing:1.1px}.stats-strip small{font-size:8px}.display-options{font-size:10px}.section-title .eyebrow{font-size:8px}.card-body h3{font-size:15px}.card-example>p{font-size:24px}.card-example>small{font-size:12px}.search-row>select{max-width:116px}.managed-name strong{font-size:12px}.managed-name small{font-size:10px}.local-badge{font-size:8px}.breadcrumb{font-size:9px}.quiz-card .display-options{font-size:10px}}
.rule-coverage{margin:0 22px 14px;font-size:11px;color:#6d7e61}.preview-examples{padding-left:22px}.preview-examples li{padding:5px 0}.preview-examples p{margin:4px 0}