:root{--ink:#343a32;--muted:#7a8071;--paper:#f6f3e9;--green:#596c50;--line:#e2dfd2;--serif:'STKaiti','KaiTi','Noto Serif SC',serif}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:15px/1.7 'Microsoft YaHei',system-ui,sans-serif}button,input,select,textarea{font:inherit}button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}button{cursor:pointer;color:inherit}button:disabled{cursor:default;opacity:.5}button:focus-visible,a:focus-visible{outline:3px solid #80946c;outline-offset:4px}a{color:var(--green)}button{border:0}header{height:86px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:18px;max-width:1120px;margin:auto}.brand{display:flex;align-items:center;gap:13px;text-decoration:none;color:var(--ink)}.seal{width:39px;height:39px;border:1px solid #a85e46;color:#a85e46;border-radius:8px;display:grid;place-items:center;font:25px var(--serif);transform:rotate(-5deg)}.brand strong{font-size:21px;letter-spacing:4px}.brand small{font-size:11px;letter-spacing:2px;color:var(--muted);display:block;line-height:1.3}header nav{display:flex;gap:28px;height:100%;align-items:center}header nav button{height:100%;background:none;color:var(--muted);padding:0 4px;border-bottom:2px solid transparent}header nav button.active{color:var(--green);border-color:var(--green)}.header-tools{display:flex;gap:8px}.icon-btn{background:#eeece1;border:1px solid var(--line);border-radius:50%;width:38px;height:38px;font-size:19px}.shell{max-width:1040px;margin:42px auto 90px;padding:0 25px}.eyebrow{font-size:11px;letter-spacing:2px;color:var(--muted);text-transform:uppercase}.hero{display:flex;align-items:center;justify-content:space-between;gap:30px}.hero h1{font:38px/1.4 var(--serif);margin:10px 0 12px;letter-spacing:3px}.hero p{color:var(--muted);margin:0;font-size:14px}.hero-art{width:125px;height:125px;position:relative;flex-shrink:0}.mini-note{position:absolute;width:72px;height:90px;top:17px;left:25px;border:1px solid #bcb99b;border-radius:3px;background:#e7ebd7;transform:rotate(14deg);box-shadow:2px 4px 0 #dfddcc}.mini-note+div{background:#f3e5bd;transform:rotate(-12deg);left:3px;top:28px;display:grid;place-items:center;font:28px var(--serif);color:#71654c}.stats{display:grid;grid-template-columns:repeat(4,1fr);margin:28px 0 34px;padding:20px 8px;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.stat{text-align:center;border-right:1px solid var(--line)}.stat:last-child{border:0}.stat strong{font:27px Georgia,serif;display:block;line-height:1.2}.stat span{color:var(--muted);font-size:12px}.section-head{display:flex;align-items:center;justify-content:space-between;margin:26px 0 17px;gap:12px}.section-head h2{font-size:17px;margin:0;font-weight:500;letter-spacing:1px}.section-head span,.muted{color:var(--muted);font-size:12px}.board{background:#e7ddbd;background-image:radial-gradient(#f7f1db 1px,transparent 1px);background-size:14px 14px;border-radius:23px;padding:33px;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:29px 24px;box-shadow:inset 0 0 15px #b7a67f26}.note{position:relative;min-height:188px;text-align:left;padding:30px 23px 20px;background:#fcf0c9;border:1.5px solid #666951;border-radius:9px 9px 23px 9px;box-shadow:3px 5px 0 #877f5738;transition:transform .2s}.note:hover{transform:translateY(-4px) rotate(-1deg)}.note:before{content:'';position:absolute;top:-10px;left:30%;width:40%;height:25px;background:#faf0cacc;box-shadow:0 2px 3px #5b553d1c;border-left:1px solid #fff8df;border-right:1px solid #fff8df;transform:rotate(-2deg)}.note.pink{background:#f5ddd9}.note.blue{background:#dcebf0}.note.sage{background:#deead5}.note.cream{background:#f2eddd}.note.lilac{background:#e7e1ef}.note .number{font:italic 12px Georgia,serif;color:#8c8769}.note h3{font:25px var(--serif);margin:7px 0 9px;letter-spacing:1px}.note p{font-size:12px;line-height:1.8;margin:0;color:#6e725f}.note .bottom{display:flex;align-items:center;justify-content:space-between;font-size:11px;color:#737764;margin-top:18px}.note .arrow{font-size:19px}.notice{font-size:12px;line-height:1.9;color:var(--muted);margin-top:23px}.notice b{font-weight:500;color:#676f59}.daily{background:#fdfbf4;border:1px solid var(--line);padding:21px 25px;border-radius:12px;display:flex;align-items:center;justify-content:space-between;gap:20px;margin-top:27px}.daily h3{font-size:15px;font-weight:500;margin:0 0 3px}.daily p{font-size:12px;color:var(--muted);margin:0}.primary{background:var(--green);color:white;border-radius:8px;padding:11px 23px}.secondary{background:transparent;border:1px solid #cdd1c2;border-radius:8px;padding:10px 20px}.text-btn{padding:5px 0;background:transparent;color:var(--green)}.page-title{font:30px var(--serif);margin:12px 0 7px}.toolbar{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin:23px 0}.toolbar input{min-width:180px;flex:1}input,select,textarea{border:1px solid #d9d9cb;border-radius:8px;background:#fdfbf6;color:var(--ink);padding:10px 13px;max-width:100%}.chips{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0 20px}.chip{border:1px solid #d8dbcd;background:transparent;border-radius:22px;padding:5px 14px;font-size:12px}.chip.active{background:#e4e9d9;border-color:#9fae8d}.card-stage{max-width:670px;margin:20px auto}.study-top{display:flex;align-items:center;justify-content:space-between;font-size:12px;color:var(--muted);margin:15px 0}.progress{height:4px;background:#e2e5d7;border-radius:4px;overflow:hidden}.progress i{display:block;background:#8d9d78;height:100%}.flash{background:#fffcf3;border:1px solid #d8d4c1;min-height:345px;border-radius:16px;box-shadow:0 8px 24px #6c66490a;position:relative;padding:33px;text-align:center;display:flex;align-items:center;justify-content:center;flex-direction:column;cursor:pointer;transition:background .2s;width:100%;color:var(--ink)}.flash.back{background:#edf1e3}.flash .word{font:48px var(--serif);letter-spacing:8px;margin:27px 0}.flash .meaning{font-size:19px;line-height:1.9;max-width:490px;text-align:left}.flash .source{font-size:11px;color:var(--muted);margin-top:20px}.flash .hint{color:#969a87;font-size:12px;margin-top:26px}.tag{display:inline-block;padding:3px 10px;background:#e7e9dc;border-radius:5px;font-size:11px;color:#67745b}.tip{margin:17px 0 0;padding:17px 20px;border-left:3px solid #b6c49b;background:#fdfbf3;font-size:13px}.tip strong{font-size:12px;color:var(--green);display:block;margin-bottom:5px}.actions{display:flex;gap:10px;align-items:center;justify-content:center;flex-wrap:wrap;margin:22px 0}.rating{flex:1;min-width:90px;background:#ede7d6;padding:12px 10px;border-radius:8px}.rating.good{background:#dce6cf}.rating.easy{background:#d9e7e5}.rating small{display:block;font-size:11px;color:#737c68}.study-bottom{display:flex;justify-content:space-between;align-items:center}.empty{text-align:center;padding:60px 20px;border:1px dashed #c8ceb8;border-radius:15px;margin:25px 0}.empty h2{font:25px var(--serif)}.empty p{font-size:13px;color:var(--muted)}.pairs{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.pair{background:#fffcf5;border:1px solid var(--line);border-radius:12px;padding:23px}.pair h3{font:22px var(--serif);margin:0 0 13px}.pair h3 span{font:12px Georgia,serif;color:#a7ac97;margin:0 9px}.pair p{font-size:13px;color:#69725f;margin:10px 0}.pair small{font-size:11px;color:var(--muted)}.question{font-size:21px;line-height:2.1;margin:25px 0}.options{display:grid;grid-template-columns:1fr 1fr;gap:12px}.option{background:#fffcf5;border:1px solid #dbdccd;border-radius:10px;text-align:left;padding:17px}.option.correct{background:#dfead4;border-color:#879c6d}.option.wrong{background:#f4dfd7;border-color:#bf8a76}.option:disabled{opacity:1}.feedback{margin:22px 0;background:#e9eddf;padding:19px;border-radius:10px}.feedback p{font-size:13px}.panel{border:1px solid var(--line);background:#fdfbf5;border-radius:12px;padding:24px;margin:20px 0}.panel h2{font-size:17px;font-weight:500;margin-top:0}.source-row{padding:17px 0;border-bottom:1px solid var(--line)}.source-row:last-child{border-bottom:0}.source-row h3{font-size:14px;margin:0 0 5px}.path{font-size:12px;overflow-wrap:anywhere;color:#747a69}.source-row p{font-size:12px;margin:6px 0}.import-actions{display:flex;gap:12px;flex-wrap:wrap}.file-label{cursor:pointer;display:inline-block}input[type=file]{display:block;padding:10px 0;border:0;background:none;font-size:13px;width:100%}details{margin-top:18px;font-size:13px}pre{white-space:pre-wrap;overflow-wrap:anywhere;font-size:12px;background:#eeeee3;padding:16px;border-radius:8px}#toast{position:fixed;bottom:95px;left:50%;transform:translateX(-50%);max-width:90%;background:#344130;color:white;border-radius:9px;padding:10px 20px;z-index:10;opacity:0;pointer-events:none;transition:opacity .2s;font-size:13px}#toast.show{opacity:1}.footer{text-align:center;font-size:11px;color:#8b907f;margin:35px 0}.result-score{font:64px Georgia,serif;color:var(--green)}.search-heading{font-size:14px;margin-top:25px}.storage-warning{background:#f6e4cc;padding:12px;font-size:13px}.bottom-nav{display:none}
@media(min-width:1000px){.shell{margin-top:43px}.board{padding:37px}.note{min-height:204px}.note h3{font-size:27px}}@media(max-width:760px){header{height:73px;padding:0 21px}header nav{display:none}.header-tools .text-btn{font-size:12px}.shell{padding:0 20px;margin:28px auto 98px}.hero h1{font-size:30px;margin-top:9px}.hero p{font-size:12px}.hero-art{width:77px;height:100px}.mini-note{width:54px;height:70px;left:20px;top:11px}.mini-note+div{left:2px;top:22px;font-size:23px}.eyebrow{font-size:10px;letter-spacing:1px}.stats{margin:22px 0 25px;padding:17px 0}.stat strong{font-size:25px}.stat span{font-size:10px}.board{grid-template-columns:repeat(2,minmax(0,1fr));padding:27px 18px;gap:27px 17px;border-radius:20px}.note{min-height:175px;padding:27px 15px 17px}.note h3{font-size:23px;letter-spacing:0}.note p{font-size:11px}.note .bottom{margin-top:13px}.note .number{font-size:11px}.section-head h2{font-size:16px}.section-head span{font-size:10px}.daily{padding:18px;gap:10px}.daily h3{font-size:13px}.daily p{font-size:11px}.primary{padding:10px 17px;white-space:nowrap}.pairs{grid-template-columns:1fr}.flash{padding:25px 20px;min-height:330px}.flash .word{font-size:40px;letter-spacing:5px}.flash .meaning{font-size:17px}.question{font-size:19px}.panel{padding:19px}.toolbar input{width:100%;flex-basis:100%}.bottom-nav{display:flex;position:fixed;bottom:0;left:0;right:0;background:#faf9f1f5;backdrop-filter:blur(12px);border-top:1px solid var(--line);justify-content:space-around;padding:7px 0 max(9px,env(safe-area-inset-bottom));z-index:5}.bottom-nav a{font-size:10px;text-decoration:none;color:#8b917f;text-align:center;min-width:60px}.bottom-nav span{font-size:20px;display:block;line-height:1.5}.bottom-nav a.active{color:#536c43}.brand strong{font-size:19px}.brand small{font-size:9px}.rating{padding:10px 6px}.notice{font-size:11px}.pair h3{font-size:21px}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
@media(max-width:760px){.hero-art{display:none}.hero h1{font-size:29px;letter-spacing:1px;white-space:nowrap}.section-head>span{display:none}.section-head h2{font-size:15px}.hero p{font-size:12px}}
@media(max-width:380px){.hero h1{font-size:26px;letter-spacing:0}}
.source-banner{background:#e8eddc;border:1px solid #ccd5bb;padding:23px 25px;border-radius:13px;margin:25px 0}.source-banner h2{font:25px/1.5 var(--serif);margin:12px 0 7px}.source-banner p{font-size:13px;color:#67735d;margin:0 0 17px}.source-banner>a{font-size:12px;margin-left:18px}.source-link{font-size:12px;margin-bottom:0}.source-link .muted{font-size:11px}@media(max-width:760px){.source-banner{padding:20px}.source-banner h2{font-size:23px}.source-banner>a{display:inline-block;margin:15px 0 0}.source-banner .primary{margin-right:15px}}
.intensive-feature{margin:28px 0 0;padding:27px 30px;border:1px solid #b8c3aa;background:linear-gradient(115deg,#e6ecd9,#f8f3df);border-radius:15px;display:flex;align-items:center;justify-content:space-between;gap:22px}.intensive-feature h2{font:28px var(--serif);margin:7px 0}.intensive-feature p{font-size:13px;margin:0;color:#59644f}.feature-tags{display:flex;gap:9px;flex-wrap:wrap;margin-top:14px}.feature-tags span{padding:3px 9px;border:1px solid #cbd3bd;background:#fafaf0;border-radius:20px;font-size:11px}.intensive-feature .primary{flex-shrink:0}.intensive-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.intensive-card{padding:24px;border:1px solid var(--line);border-radius:12px;background:#fdfbf4;display:flex;flex-direction:column}.intensive-card h2{font:24px/1.5 var(--serif);margin:14px 0}.intensive-card h2 span,.drill-title span{font-size:15px;color:var(--muted)}.intensive-card p{font-size:13px;margin:4px 0}.intensive-card button{align-self:flex-start;margin-top:17px}.pagination{display:flex;justify-content:center;align-items:center;gap:18px;margin:28px 0}.contrast-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;margin-top:23px}.contrast-grid .panel{margin:0}.contrast-grid h2{font:28px var(--serif);margin:0 0 17px}.focus-meaning{font-size:17px;min-height:60px}.contrast-summary{padding:20px 26px;border-left:3px solid #8c9d79;background:#eeefdf;margin:23px 0}.contrast-summary h2{font-size:15px;margin:0 0 8px}.contrast-summary p{margin:0}.drill-result{text-align:center;margin:25px auto;max-width:760px}.drill-result .result-score span{font-size:25px}.drill-result .tip{text-align:left;margin:25px 0}.drill-result .actions{flex-wrap:wrap}.drill-hint{margin:18px 0;color:var(--green);font-size:13px}.drill-hint summary{cursor:pointer}.drill-hint p{padding:12px;background:#e9eddd;border-radius:8px}.blank{color:#84956d}.option-explanations>div{border-top:1px solid #c9d4bb;margin-top:15px;padding-top:10px}.option-explanations h3{font-size:14px;margin:0 0 7px}.option-explanations p{font-size:13px;line-height:1.9;margin:0}
@media(max-width:700px){.intensive-feature{padding:21px;align-items:flex-start;flex-direction:column}.intensive-feature h2{font-size:25px}.intensive-feature .primary{width:100%;margin-top:4px}.intensive-grid,.contrast-grid{grid-template-columns:1fr}.intensive-card{padding:20px}.drill-title{font-size:26px}.hero h1{font-size:29px;letter-spacing:1px}.hero-art{width:80px}.bottom-nav a{min-width:0;flex:1}.pagination{gap:12px}.pagination button{padding:9px 13px}}
/* Full-vocabulary provenance, correction cards and separated learning stages. */
.quality-entry{margin-top:24px}
.correction-example{padding:14px 16px;margin:16px 0;border-left:3px solid #647657;background:#f0f3e9;border-radius:8px}
.correction-example .correction-wrong{color:#805543}
.correction-example .correction-right{color:#365b3c}
.quality-sources{margin:14px 0;padding:12px 16px;background:#f4f2eb;border:1px solid #dedbce;border-radius:12px;overflow-wrap:anywhere}
.quality-sources summary{cursor:pointer;font-weight:600;line-height:1.7}
.quality-sources li{margin:8px 0}
.quality-sources p{line-height:1.8}
.quality-correction{margin:18px 0;padding:18px;border:1px solid #d9d8c8;background:#fbfaf5;border-radius:16px;overflow-wrap:anywhere}
.quality-correction .study-top{flex-wrap:wrap;gap:8px}
.quality-correction h3{margin:0;font-size:18px}
.quality-correction p{line-height:1.8}
.quality-comparisons p{padding:10px 0;border-bottom:1px solid #e6e2d6}
.quality-comparisons small{font-weight:normal;color:#686b5a;font-size:12px}
.quality-card-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin:20px 0}
.quality-card-grid .favorite-row{min-width:0;height:100%;text-align:left;overflow-wrap:anywhere}
.quality-task-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin:16px 0}
.quality-task-grid button{line-height:1.8;white-space:normal}
.option.selected{border-color:var(--green,#536849);background:#e8eddf}
@media(max-width:700px){.quality-card-grid,.quality-task-grid{grid-template-columns:1fr}.quality-correction{padding:14px}.quality-sources{padding:10px}.quality-card-grid .favorite-row{margin:0}}

.question-source{color:var(--muted,#797d70);font-size:13px;line-height:1.7;margin:14px 0;overflow-wrap:anywhere}
.today-tasks{margin:20px 0;padding:18px;border:1px solid var(--line,#e4dfd3);border-radius:18px;background:#fffdf7}.today-tasks h2{font-size:19px;margin:0}.today-tasks .quality-task-grid{margin:14px 0 0}.today-tasks button b{font-size:14px;font-weight:500}.distractor-details{margin-top:16px}.distractor-details summary{cursor:pointer;font-weight:600;line-height:1.7}.answer-analysis{border-left:3px solid var(--green,#315846);padding:8px 12px;margin:14px 0}.answer-analysis p{margin:8px 0;line-height:1.8}.recall-note{font-size:14px;line-height:1.8;color:#656e60}.next-question{position:sticky;bottom:82px;z-index:2;box-shadow:0 3px 12px #20382b1a}.question{white-space:pre-line}
@media(max-width:700px){.today-tasks .quality-task-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}.today-tasks{padding:12px}.today-tasks .secondary{padding:12px 5px;font-size:13px}.today-tasks button b{font-size:12px}.next-question{bottom:78px}}

.next-question{position:static;margin-top:18px;width:100%;box-shadow:none}