:root{--ink:#193d36;--accent:#216e60;--muted:#687771;--line:#dce5de;--cream:#f4f6ef}*{box-sizing:border-box}body{margin:0;color:var(--ink);background:var(--cream);font:16px/1.75 system-ui,-apple-system,"Noto Sans CJK SC","Microsoft YaHei",sans-serif}button,input,select{font:inherit}button,select,input{border:1px solid #cbd7cd;border-radius:10px;background:white;color:var(--ink);min-height:46px}button{cursor:pointer;padding:10px 18px}button:hover{background:#edf4ed}button:disabled{opacity:.45;cursor:default}button:focus-visible,input:focus-visible,select:focus-visible,a:focus-visible{outline:3px solid #b5843e;outline-offset:3px}header{background:#fff;border-bottom:1px solid var(--line)}.head{max-width:1160px;margin:auto;padding:20px 28px;display:flex;justify-content:space-between;align-items:center}.brand{display:flex;align-items:center;gap:12px}.brand strong{font-size:19px}.brand small{display:block;font-size:10px;letter-spacing:2px;color:var(--muted)}.icon{background:var(--ink);color:#fff;border-radius:13px;width:46px;height:46px;display:grid;place-items:center;font-family:serif;font-size:25px}.private{font-size:12px;border:1px solid var(--line);padding:4px 12px;border-radius:30px}main{max-width:1160px;margin:auto;padding:0 28px}.hero{padding:42px 0 32px;display:flex;justify-content:space-between;gap:30px;align-items:center}.eyebrow{font-size:12px;letter-spacing:2px;color:var(--accent);margin:0}h1{font-size:30px;line-height:1.4;margin:10px 0;font-weight:650}.hero p:last-child{color:var(--muted);margin:0}.stats{display:flex;gap:30px;flex-shrink:0}.stats strong{display:block;font-size:28px;font-weight:550;font-variant-numeric:tabular-nums}.stats span{font-size:12px;color:var(--muted)}.tabs{display:flex;gap:8px;margin-bottom:24px;border-bottom:1px solid var(--line)}.tabs button{background:none;border:none;border-bottom:3px solid transparent;border-radius:0;padding:14px 25px}.tabs .active{border-color:var(--accent);font-weight:700}.toolbar{background:#fff;border:1px solid var(--line);border-radius:16px;padding:24px}.search{display:block}label{font-size:12px;font-weight:600;color:var(--muted)}input{display:block;width:100%;padding:12px 16px;margin-top:5px}.filters{display:grid;grid-template-columns:1fr 1.3fr .8fr 1fr;gap:14px;margin:18px 0}select{display:block;width:100%;padding:9px 30px 9px 12px;max-width:100%;text-overflow:ellipsis}.actions{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.primary{background:var(--ink);color:#fff;border-color:var(--ink)}.primary:hover{background:var(--accent)}#count{font-size:13px;color:var(--muted);margin-left:auto}.notice{font-size:12px;line-height:1.9;color:#6f796e;margin:18px 4px}.card{background:white;border:1px solid var(--line);border-radius:16px;margin:18px 0;padding:26px}.card-top{display:flex;gap:10px;align-items:start;justify-content:space-between}.meta{font-size:12px;color:var(--muted);display:flex;gap:8px;flex-wrap:wrap}.tag{background:#edf2eb;border-radius:5px;padding:2px 7px}.card h2{font-size:18px;font-weight:550;line-height:1.9;margin:18px 0;overflow-wrap:anywhere}.star{min-width:46px;padding:5px 10px}.star.saved{color:#895800;background:#fff7df}.option{display:flex;text-align:left;width:100%;border-color:var(--line);margin:8px 0;padding:12px 15px;gap:13px;line-height:1.65}.option b{font-weight:600;color:var(--accent)}.option.chosen{background:#e7f1ed;border-color:var(--accent)}.answer{background:#eef5ef;border-radius:10px;padding:17px;margin-top:15px}.answer p{margin:0 0 8px}.answer details{border-top:1px solid #d4e3d7;margin-top:14px;padding-top:12px}.answer summary{font-size:13px;cursor:pointer}.ocr{font-size:13px;white-space:pre-wrap;overflow-wrap:anywhere;max-height:450px;overflow:auto;margin-top:12px;color:#536159}.warning{font-size:13px;color:#845a1d;background:#fff8e8;border-radius:8px;padding:10px 13px}.reveal{margin-top:10px}.card-note{font-size:12px;color:var(--muted)}.pagination{display:flex;justify-content:center;gap:20px;align-items:center;margin:28px 0}.pagination span{font-size:13px}.guide-layout{display:grid;grid-template-columns:220px minmax(0,1fr);gap:24px}.guide-layout aside{align-self:start;position:sticky;top:20px}.guide-layout aside label{display:none}#guideNav button{display:block;border:0;background:none;text-align:left;width:100%;font-size:13px;line-height:1.6;margin-bottom:5px}#guideNav button.active{background:#e2ebe0;font-weight:600}.guide-body{background:#fff;border:1px solid var(--line);border-radius:16px;padding:32px;overflow-wrap:anywhere;min-width:0}.guide-body h1{font-size:26px}.guide-body h2{font-size:22px;margin-top:32px}.guide-body h3{font-size:18px;margin-top:24px}.guide-body p{margin:16px 0}.guide-body a{color:#216e60}.guide-body blockquote{border-left:3px solid #9caf98;margin:20px 0;padding-left:18px;color:#5b6c60}.table-wrap{overflow:auto;max-width:100%}.guide-body table{border-collapse:collapse;font-size:14px;min-width:500px;width:100%}.guide-body td,.guide-body th{padding:12px;border:1px solid var(--line);text-align:left}.guide-body th{background:#eef3eb}.guide-body code{white-space:normal}footer{text-align:center;font-size:12px;color:var(--muted);padding:35px 0 45px}#storageWarning{display:block;color:#8e5429}[hidden]{display:none!important}@media(max-width:700px){.head{padding:16px 20px}main{padding:0 16px}.hero{padding:30px 4px 24px;display:block}.hero h1{font-size:25px}.eyebrow{font-size:11px}.hero p:last-child{font-size:14px}.stats{gap:36px;margin-top:22px}.stats strong{font-size:25px}.tabs{margin-bottom:18px}.tabs button{flex:1}.toolbar{padding:18px}.filters{grid-template-columns:1fr;gap:10px;margin:14px 0}.filters label{display:grid;grid-template-columns:54px minmax(0,1fr);align-items:center}.filters select{font-size:14px}input{font-size:15px}#count{width:100%;margin:2px 0 0}.card{padding:19px}.card h2{font-size:16px}.option{font-size:15px}.guide-layout{display:block}.guide-layout aside{position:static;margin-bottom:14px}.guide-layout aside label{display:block}#guideNav{display:none}.guide-body{padding:20px}.guide-body h1{font-size:23px}.guide-body h2{font-size:20px}.guide-body{font-size:16px}.pagination{gap:12px}.pagination button{padding:10px 14px}}

.source-images{margin-top:18px;border-top:1px solid var(--line);padding-top:15px}.source-images summary{font-size:13px;cursor:pointer}.source-images img{display:block;width:100%;height:auto;border:1px solid var(--line);border-radius:7px;margin:12px 0}.source-images a{display:block}
.worked-question{background:#f4f7f1;border-left:3px solid #719776;padding:16px 18px;margin:23px 0;border-radius:0 9px 9px 0}.worked-question p{margin:6px 0 12px}.worked-options{list-style:none;padding:0}.worked-options li{margin:8px 0}.worked-question summary{cursor:pointer;font-size:14px}.worked-question details{border-top:1px solid var(--line);padding-top:12px;margin-top:12px}
.practice-answer{background:#f0f4ec;border:1px solid var(--line);border-radius:9px;margin:18px 0;padding:13px 16px}.practice-answer summary{cursor:pointer;font-weight:600;font-size:14px}
.transfer{margin-top:28px;border:1px solid var(--line);border-radius:12px;padding:18px;background:#fff}.transfer summary{cursor:pointer;font-size:14px;font-weight:600}.transfer p{font-size:13px;color:var(--muted)}.import-label{position:relative;display:inline-flex;align-items:center;min-height:46px;padding:10px 18px;background:#fff;border:1px solid #cbd7cd;border-radius:10px;font:inherit;color:var(--ink);overflow:hidden}.import-label input{position:absolute;inset:0;opacity:0;cursor:pointer;margin:0}.import-label:focus-within{outline:3px solid #b5843e;outline-offset:3px}
.issue-note{background:#fff7e7;border-left:3px solid #b38944;padding:12px 14px;margin:14px 0;color:#75571f;font-size:13px}.issue-note strong{display:block;font-size:12px}.issue-note p{margin:6px 0!important}

.resume-panel{background:#e6f0eb;border:1px solid #bccfc5;border-radius:16px;padding:18px 22px;margin:0 0 20px}.resume-panel p{margin:10px 0 6px}.resume-panel small{color:#52655b}.new-explanation{border-left:3px solid #376f62;padding:4px 16px;margin:18px 0}.new-explanation-text{white-space:pre-wrap;line-height:1.85}.review-status{font-weight:600}.resume-panel button:disabled{opacity:.55}

/* Structured Markdown for the reviewed preview batch. */
.markdown-content{white-space:normal;line-height:1.85;overflow-wrap:anywhere;min-width:0}.markdown-content h3{font-size:1.05rem;line-height:1.5;margin:1.3em 0 .6em}.markdown-content p{margin:.65em 0}.markdown-content ul,.markdown-content ol{padding-left:1.5em}.markdown-content li{margin:.45em 0}.markdown-content a{overflow-wrap:anywhere}.markdown-content pre{white-space:pre-wrap;overflow-wrap:anywhere}.original-explanation{margin-top:18px;padding-top:12px;border-top:1px solid var(--line)}.original-explanation summary{cursor:pointer}.guide-body{overflow-wrap:anywhere}

/* Independent resume entries and bounded navigation controls. */
.resume-choices{display:grid;grid-template-columns:1fr 1fr;gap:20px}.resume-choices>div{min-width:0}.resume-choices p{overflow-wrap:anywhere;font-size:13px}.question-chapter{overflow-wrap:anywhere;max-width:100%}.card-top .meta{min-width:0}.star{flex-shrink:0}.option span{min-width:0;overflow-wrap:anywhere}.question-navigation{margin-top:18px;display:flex;gap:10px;flex-wrap:wrap}.pagination{flex-wrap:wrap}.pagination form{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.pagination input{width:80px;margin:0;padding:8px}.pagination #pageStatus{flex-basis:100%;text-align:center;margin:0;color:#845a1d;font-size:13px}
@media(max-width:420px){.resume-choices{grid-template-columns:1fr;gap:12px}.resume-choices button{width:100%}.pagination form{justify-content:center;width:100%}.question-navigation button{width:100%;padding:10px}.meta{gap:5px}}

.tabs{position:sticky;top:0;z-index:5;background:var(--cream)}

.study-modes{display:flex;gap:6px;margin:18px 0 14px;padding:5px;background:#e8efeb;border-radius:13px;width:fit-content}.study-modes button{border:0;min-width:90px;min-height:44px;background:transparent}.study-modes button.active{background:#184b44;color:white}.question-counts{display:flex;flex-wrap:wrap;gap:16px;color:#60766f;font-size:12px;margin:12px 0}.question-counts b{font-variant-numeric:tabular-nums}.option:disabled{opacity:1;cursor:default}.option.correct-option{background:#e8f1ec;border-color:#237967}.memory-explanation summary{cursor:pointer;font-weight:700;padding:12px 0}.memory-explanation .new-explanation>strong{display:none}.restart{margin:12px 0}#storageWarning{display:block;color:#9b391c;font-weight:700}[hidden]{display:none!important}

/* Learning modules keep each subject's practice separate. */
.section-heading h2{font-size:24px;margin:6px 0}.section-heading p:last-child{color:var(--muted);margin:0 0 22px}.module-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px}.module-card{display:flex;flex-direction:column;align-items:flex-start;text-align:left;padding:25px;border-radius:16px;min-height:210px;background:#fff;border:1px solid var(--line)}.module-card:hover{border-color:var(--accent);background:#f8fbf7}.module-title{font-size:22px;font-weight:650}.module-total{font-size:15px;color:var(--accent);margin:12px 0 5px}.module-progress{font-size:13px;color:var(--muted)}.module-enter{font-size:14px;font-weight:600;margin-top:22px}.home-resources{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:24px}.home-resources>div{padding:22px;border:1px solid var(--line);border-radius:14px}.home-resources h3{font-size:17px;margin:0}.home-resources p{color:var(--muted);font-size:14px}.guide-scope,#bankHeading{font-size:22px;margin:0 0 18px}.tabs{flex-wrap:wrap}.tabs button{padding:12px 18px}@media(max-width:700px){.home-resources{grid-template-columns:1fr}.module-grid{grid-template-columns:1fr}.module-card{min-height:180px}.tabs button{font-size:14px;flex:0 1 auto;padding:12px 14px}}

/* Subject-scoped reading and chapter practice. */
.module-card .module-title{margin:0}.module-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}.module-actions button{font-size:14px;padding:9px 14px}.module-card:hover{background:#fff}.guide-layout aside{top:74px;max-height:calc(100vh - 96px);overflow-y:auto}.guide-layout aside label{display:block;margin-bottom:14px}.guide-content{min-width:0}.guide-actions{display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;align-items:center;margin-bottom:14px}.guide-actions p{margin:0;color:var(--muted);font-size:13px}.guide-pagination{display:flex;justify-content:space-between;gap:16px;margin:24px 0}.guide-body .table-wrap{width:100%;max-width:100%;overflow-x:auto;overscroll-behavior-x:contain;margin:22px 0}.guide-body .table-wrap:focus-visible{outline:3px solid #b5843e;outline-offset:3px}.guide-body table{min-width:560px}.guide-body th,.guide-body td{vertical-align:top}.guide-body ul,.guide-body ol{padding-left:1.5em}.guide-body li{margin:.45em 0}.guide-body a{overflow-wrap:anywhere}
@media(max-width:700px){.guide-layout aside{position:static;max-height:none;overflow:visible}.guide-layout aside label{margin-bottom:12px}.guide-layout aside select{font-size:15px}.guide-actions{align-items:center}.guide-body{padding:20px 18px}.guide-body table{font-size:14px}.guide-pagination button{min-width:110px}.module-actions{width:100%}.module-actions button{flex:1}}

.guide-actions{position:sticky;top:58px;z-index:4;background:var(--cream);padding:8px 0}

/* Discipline hierarchy and independent bank continuation. */
.discipline-section{margin:0 0 28px}.discipline-heading{display:flex;align-items:baseline;gap:14px;margin:0 0 14px}.discipline-heading h3{margin:0;font-size:22px}.discipline-heading span{font-size:13px;color:var(--muted)}.discipline-section .module-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.module-card{min-width:0}.module-card .module-title{font-size:21px}.module-actions{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));width:100%;gap:12px}.module-entry{min-width:0}.module-entry button{width:100%;font-size:15px}.module-entry small{display:block;color:var(--muted);font-size:12px;overflow-wrap:anywhere;margin:5px 0 0}.module-reading{grid-column:1/-1;display:flex;align-items:center;gap:12px}.module-reading button{width:auto;min-width:105px}.module-reading small{margin:0}.study-modes{position:sticky;top:56px;z-index:4;box-shadow:0 2px 6px #193d3612}.home-resources{margin-top:12px}
@media(max-width:700px){.discipline-section .module-grid{grid-template-columns:1fr}.discipline-heading h3{font-size:20px}.module-card{padding:20px}.module-actions button{flex:initial}.module-reading{align-items:flex-start}.module-reading small{padding-top:10px}.study-modes{margin-top:12px}}

/* Keep navigation targets below the measured sticky controls at every font size. */
:root{--tabs-height:56px;--mode-height:58px;--guide-actions-height:66px}
.study-modes,.guide-actions{top:calc(var(--tabs-height) + 8px)}
.study-modes{width:100%;border-radius:0;background:var(--cream);box-shadow:0 -8px 0 var(--cream),0 6px 0 var(--cream)}
#home,#bank,#guide{scroll-margin-top:calc(var(--tabs-height) + 12px)}
#questions,#questions .card{scroll-margin-top:calc(var(--tabs-height) + var(--mode-height) + 20px)}
#guideBody h1,#guideBody h2,#guideBody h3,#guideBody h4{scroll-margin-top:calc(var(--tabs-height) + var(--guide-actions-height) + 20px)}

/* Three-level catalog and explicit, lossless stem blocks. */
.catalog-breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin:8px 0 20px;line-height:1.5;font-size:14px}
.catalog-breadcrumb button{min-height:44px;padding:8px 12px;background:transparent;border:1px solid var(--line)}
.catalog-breadcrumb [aria-current]{font-weight:650;overflow-wrap:anywhere}
.catalog-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
.catalog-card{display:flex;flex-direction:column;align-items:flex-start;gap:18px;min-width:0;padding:28px;min-height:190px;text-align:left;background:#fff;border:1px solid var(--line);border-radius:16px}
.catalog-card strong{font-size:24px;color:var(--accent)}
.catalog-card>span{font-size:14px;color:var(--muted)}
.catalog-card .catalog-enter{font-size:16px;color:var(--accent);margin-top:auto}
.question-stems{margin:20px 0;font-size:18px;line-height:1.8;overflow-wrap:anywhere}
.question-stems h3{font-size:13px;font-weight:650;color:var(--muted);margin:0 0 8px}
.question-stems p{white-space:pre-wrap;margin:0}
.shared-stem{background:#f2f6f3;border-left:3px solid #8fae9f;padding:16px 18px;border-radius:4px}
.child-stem{margin-top:18px;padding:0 3px}
.whole-stem{white-space:pre-wrap;overflow-wrap:anywhere}
.search-scope{margin:6px 0 14px;font-size:13px;color:var(--muted);overflow-wrap:anywhere}
#clearSearch{margin:8px 0;min-height:44px}
@media(max-width:700px){.catalog-grid{grid-template-columns:1fr}.catalog-card{padding:22px;min-height:165px}.catalog-card strong{font-size:22px}.question-stems{font-size:17px}.shared-stem{padding:14px}.catalog-breadcrumb{gap:5px}.catalog-breadcrumb button{padding:7px 9px}}

.review-note{color:var(--muted);font-size:13px;font-weight:400;line-height:1.7;margin:8px 0}