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@media(max-width:520px){.card-grid{grid-template-columns:1fr}.material-card{padding:22px}.material-card .lead{min-height:0}.material-card h3{font-size:21px}.card-angles{margin-bottom:14px}.hero .button-row{gap:14px}.hero .button{padding:10px 17px}.mode-nav{justify-content:space-between;gap:10px}.filters select{flex:1 1 42%;min-width:0}.section-heading{align-items:center}.stat b{font-size:24px}.stats-strip{justify-content:space-between;gap:8px}.stats-note{margin-top:6px}.sheet-bottom{gap:10px;font-size:11px}.page-head p{font-size:14px}.source-register th:nth-child(3),.source-register td:nth-child(3){display:none}.source-register th:first-child{width:60%}.source-register th:nth-child(2){width:40%}.toolbar .button{flex:1;padding:10px 12px}.model-text{font-size:17px}.detail-aside .button{min-height:46px}.source-line span{max-width:100%}.callout{padding:12px;font-size:12px}}
@media(max-width:350px){.shell{padding:0 14px}.header-inner{padding-left:14px;padding-right:14px}.hero h1{font-size:30px}nav{font-size:12px;gap:9px}.panel{padding:22px 16px}.topic-button{padding:7px 9px;font-size:11px}.stat{gap:4px}.stat span{font-size:11px}.material-card{padding:20px}.hero .button-row{gap:11px}.feature-sheet{padding:21px}.brand-divider{margin:0 4px}.review-buttons{flex-direction:column}.review-buttons .button{width:100%}.page-head h1{font-size:27px}.detail-head h1{font-size:26px}}
.book-layout{display:grid;grid-template-columns:270px minmax(0,1fr);gap:38px;margin:32px 0 45px}.book-aside>p{margin-top:23px;font-size:11px;line-height:1.9}.book-aside .panel{padding:22px}.book-aside .panel h2{font-size:19px}.book-cover{position:relative;min-height:310px;border:1px solid #d6d7c9;border-left:8px solid #8e4035;padding:27px 24px;background:#fffaf0;box-shadow:6px 6px 0 #e8e9df}.book-cover-kicker{font-size:10px;letter-spacing:.13em;color:#975744}.book-cover>p:first-of-type{font-family:var(--serif);font-size:20px;margin:26px 0 7px}.book-cover h2{font-size:36px;color:#984738;margin:0 0 13px}.book-cover-rule{width:40px;border-top:2px solid #b6785c;margin:20px 0}.book-cover .small{font-size:11px;line-height:2;color:var(--muted)}.book-cover-status{font-size:10px;border-top:1px solid var(--line);display:block;padding-top:12px;color:#8c543c}.book-counts{display:flex;justify-content:space-between;gap:9px;padding:18px 0 23px;color:var(--muted);font-size:11px}.book-counts b{font-family:var(--serif);font-size:25px;color:var(--green);margin-right:5px;font-weight:500}.book-boundary{margin:0 0 22px}.book-layout .search-wrap input{padding-left:15px}.book-chapter{margin:0 0 23px;background:var(--white);border:1px solid var(--line);border-radius:6px;padding:23px 24px 9px}.book-chapter-title{display:flex;gap:15px;align-items:flex-start}.book-chapter-title h2{font-size:20px;margin:0 0 4px}.book-chapter-title p{font-size:11px;color:var(--muted);margin-bottom:17px}.chapter-number{font-family:var(--serif);font-size:24px;line-height:1.3;color:var(--accent)}.book-toc{list-style:none;margin:0;padding:0}.book-toc li{border-top:1px solid var(--line)}.book-toc a{display:flex;align-items:baseline;gap:12px;padding:14px 0;font-size:14px;line-height:1.75}.book-toc a:hover .book-item-title{text-decoration:underline;text-underline-offset:4px}.book-item-number{font-size:10px;color:#8c978b;flex-shrink:0}.book-item-title{flex:1;min-width:0;overflow-wrap:anywhere}.book-item-title small{display:block;color:#597d58;font-size:10px;margin-top:3px}.book-page{flex-shrink:0;color:var(--muted);font-size:11px}.book-entry-grid{margin-top:25px}.book-entry-grid .mini-list a{align-items:baseline}.mini-list .book-related-title{font-size:14px;flex-shrink:1;color:var(--ink);overflow-wrap:anywhere}.book-pager{display:flex;gap:20px;justify-content:space-between;align-items:start;border-top:1px solid var(--line);padding:15px 0;margin:10px 0;font-size:12px}.book-pager a{max-width:48%;overflow-wrap:anywhere;padding:5px 0}.book-pager a:last-child{text-align:right}.book-pager>span{font-size:12px;color:var(--muted)}.book-record-summary{margin-top:24px}
@media(max-width:1020px){.book-layout{grid-template-columns:230px minmax(0,1fr);gap:25px}.book-cover{padding:24px 19px}.book-chapter{padding:21px 20px 8px}.site-header nav{gap:17px}}
@media(max-width:760px){.book-layout{grid-template-columns:1fr;gap:12px}.book-aside{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:18px}.book-cover{grid-row:span 2;min-height:285px;padding:22px 18px}.book-cover h2{font-size:29px}.book-cover>p:first-of-type{font-size:17px}.book-aside>p{margin:0}.book-counts{flex-wrap:wrap;justify-content:flex-start;gap:7px 18px;padding:0}.book-aside .panel{grid-column:1/-1}.book-aside .steps{gap:13px}.book-chapter{padding:20px 18px 6px}.book-chapter-title h2{font-size:19px}.book-toc a{font-size:13px;gap:9px}.book-entry-grid{margin-top:20px}.site-header nav{gap:8px}.book-pager{font-size:12px}}
@media(max-width:520px){.book-aside{display:block}.book-cover{max-width:300px;min-height:0;margin:0 auto 24px}.book-cover>p:first-of-type{margin-top:20px}.book-cover h2{font-size:34px}.book-aside>p{margin-bottom:12px}.book-counts{justify-content:space-between;padding:8px 0 22px}.book-page{font-size:10px}.book-toc a{gap:8px}.book-chapter-title{gap:11px}.book-pager a{font-size:11px}.book-entry-grid .mini-list a{flex-wrap:wrap}.book-layout .filters select{flex-basis:100%}}
@media(max-width:350px){.site-header nav{font-size:11px;gap:6px}.book-chapter{padding:18px 14px 6px}.book-chapter-title h2{font-size:17px}.book-toc a{font-size:12px}.book-toc .book-item-number{display:none}}
.book-howto summary{cursor:pointer;font-family:var(--serif);font-size:18px;min-height:32px}.book-howto .steps{margin-top:18px}
.study-entry{display:flex;align-items:center;justify-content:space-between;gap:24px;margin:24px 0 0;padding:22px 26px;border:1px solid #c4d0bf;border-radius:6px;background:#edf1e8}.study-entry .label{margin-bottom:6px}.study-entry b{font-family:var(--serif);font-size:20px}.study-entry p{font-size:12px;color:var(--muted);margin:5px 0 0}.study-entry .button{flex-shrink:0}.study-hero{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(0,1fr);gap:50px;padding:44px 0 36px;align-items:center}.study-hero h1{font-size:clamp(32px,3.5vw,48px);line-height:1.5;letter-spacing:.02em;margin:0 0 18px}.study-hero h1 em{font-style:normal;color:var(--accent)}.study-hero>div>p:not(.eyebrow){font-size:14px;color:var(--muted);line-height:1.9;max-width:570px}.study-roadmap{padding:28px 30px;background:var(--white);border:1px solid var(--line);box-shadow:6px 6px 0 #e8ebe1;border-radius:5px}.study-roadmap .label{margin-bottom:20px}.study-cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;margin-bottom:30px}.study-card{margin:0;display:flex;flex-direction:column;min-width:0}.study-card .chips{margin:0 0 17px}.study-card h2{font-size:23px;line-height:1.6}.study-card>p{font-size:14px;color:var(--muted)}.study-card-bottom{margin-top:auto;padding-top:15px;border-top:1px solid var(--line);display:flex;flex-wrap:wrap;gap:9px 17px;justify-content:space-between;align-items:center}.study-search input{padding-left:15px}.study-source-register{margin-top:34px}.study-source-register>summary{font-family:var(--serif);font-size:21px;cursor:pointer;min-height:44px;line-height:1.7}.study-source-item{border-top:1px solid var(--line);padding:20px 0}.study-source-item:last-child{padding-bottom:0}.study-source-item h3{font-size:17px;line-height:1.8}.study-source-item p{font-size:13px}.study-material{padding:20px;background:var(--soft);border:1px solid #d4dfce;border-radius:5px;font-size:15px;line-height:1.9;margin:20px 0}.study-material p{margin:10px 0}.study-material .button-row{margin-top:14px}.study-word-note{font-size:12px;color:#6a573e;background:#f7f2e8;border-radius:4px;padding:9px 12px;margin:0 0 20px}.study-own-answer{white-space:pre-wrap;overflow-wrap:anywhere;padding:20px;background:var(--soft);border-radius:5px;font-size:15px;line-height:2;margin-bottom:18px}.study-modes{flex-wrap:wrap}.study-source-register .source-line{margin:9px 0}
.study-card h2 a{display:block}
@media(max-width:1080px){.site-header .header-inner{flex-wrap:wrap;gap:6px 20px}.site-header nav{gap:14px}.study-hero{gap:28px}.study-roadmap{padding:25px}.study-card{padding:23px}.study-card h2{font-size:21px}}
@media(max-width:760px){.site-header nav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:0 12px;text-align:center}.site-header nav a{padding:8px 0}.study-entry{display:block;padding:20px;margin-top:22px}.study-entry .button{margin-top:14px}.study-entry b{font-size:18px}.study-hero{grid-template-columns:1fr;gap:24px;padding:30px 0}.study-hero h1{font-size:32px}.study-cards{gap:14px}.study-roadmap{padding:23px}.study-modes{gap:6px;justify-content:space-between}.study-modes a{font-size:12px}.study-source-register>summary{font-size:18px}.study-material{padding:16px;font-size:14px}}
@media(max-width:550px){.study-cards{grid-template-columns:1fr}.study-card{padding:22px}.study-card h2{font-size:21px}.study-card-bottom{align-items:flex-start}.study-material .button-row{align-items:stretch;flex-direction:column}.study-hero .button-row{gap:14px}.study-own-answer{padding:16px}.study-source-item .source-line{display:grid;gap:3px}}
@media(max-width:350px){.study-hero h1{font-size:28px}.study-card{padding:20px 16px}.study-modes a{font-size:11px}.study-modes{gap:3px}.study-entry{padding:18px 16px}.study-entry b{font-size:17px}.site-header nav{font-size:12px;gap:0 8px}}
/* 1.3：先选模块，再展开内容。辅助说明保留在详情，不占据首页。 */
main.shell{max-width:1180px;padding-bottom:32px}
.module-heading{padding:36px 0 26px}
.module-heading h1{font-family:var(--sans);font-size:32px;letter-spacing:0;font-weight:650;line-height:1.4;margin:0}
.module-heading p{font-size:16px;color:var(--muted);margin:9px 0 0}
.back-link{display:inline-block;font-size:14px;color:var(--muted);margin-bottom:16px;padding:4px 0}
.module-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;margin-bottom:26px}
.module-card{display:flex;align-items:center;gap:22px;position:relative;min-height:158px;padding:29px;border:1px solid var(--line);border-radius:12px;background:var(--white);transition:background .15s,border-color .15s}
.module-card:hover{background:#f0f4ed;border-color:#a7b9ac;color:var(--ink)}
.module-card>div{min-width:0}
.module-card h2{font-family:var(--sans);font-size:23px;font-weight:650;margin:0 0 9px}
.module-card p{font-size:15px;line-height:1.7;margin:0;color:var(--muted);padding-right:10px}
.module-icon{width:50px;height:54px;flex-shrink:0;display:grid;place-items:center;background:var(--soft);border-radius:10px;color:var(--green)}
.module-icon svg{width:28px;height:28px}
.module-arrow{position:absolute;right:20px;top:19px;font-size:18px;color:#778c80}
.resume-study{display:flex;align-items:center;gap:20px;padding:18px 0;border-top:1px solid var(--line);font-size:14px;color:var(--muted)}
.resume-study b{font-weight:500;color:var(--ink)}
.resume-study>span:last-child{margin-left:auto}
.lesson-list{border:1px solid var(--line);border-radius:10px;background:var(--white);overflow:hidden}
.lesson-row{display:grid;grid-template-columns:36px minmax(0,1fr) auto;gap:20px;align-items:center;padding:23px 26px;border-bottom:1px solid var(--line)}
.lesson-row:last-child{border-bottom:0}
.lesson-row:hover{background:#f0f4ed;color:var(--ink)}
.lesson-row h2{font-family:var(--sans);font-size:21px;font-weight:600;line-height:1.5;margin:0 0 5px}
.lesson-row p{font-size:15px;margin:0;color:var(--muted)}
.lesson-number{font-size:16px;font-variant-numeric:tabular-nums;color:#8a9b8e}
.lesson-row-end{display:flex;align-items:center;gap:14px;font-size:13px;color:var(--muted)}
.lesson-row-end>span{font-size:20px}
.filter-drawer{margin:0 0 18px;font-size:14px;color:var(--muted)}
.filter-drawer>summary{cursor:pointer;width:fit-content;min-height:42px;padding:9px 0}
.filter-drawer .extra-body{padding:8px 0 0}
.filter-drawer .filters{margin:12px 0 8px}
.simple-search input{padding-left:15px}
.material-card h3 a{display:block}
.material-card .lead{font-size:15px;min-height:0;margin-bottom:16px}
.material-card .card-bottom{font-size:13px}
.material-card .card-bottom a{font-size:14px}
.lesson-shell{max-width:900px;margin:auto}
.lesson-heading{padding-bottom:0}
.lesson-heading h1{font-size:29px}
.study-modes{margin:22px 0;gap:32px;flex-wrap:nowrap}
.study-modes a{font-size:15px;padding:11px 0}
.lesson-shell .panel{padding:28px 32px}
.lesson-shell .panel h2{font-family:var(--sans);font-size:21px}
.lesson-shell .panel h3{font-size:16px}
.lesson-shell .note-list{font-size:16px;color:var(--ink);gap:13px;margin-bottom:0}
.lesson-shell .steps{gap:24px}
.lesson-shell .steps b{font-size:17px;margin-bottom:6px}
.lesson-shell .steps p{font-size:15px;line-height:1.9}
.lesson-section-title{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-bottom:14px}
.lesson-section-title h2{margin:0}
.lesson-section-title>span{font-size:14px;color:var(--muted);white-space:nowrap}
.lesson-section-title .text-link{padding:0;flex-shrink:0}
.lesson-shell .field-meta{font-size:13px}
.lesson-shell .reveal>summary{font-size:16px}
.lesson-shell .sentence{font-size:15px;line-height:1.9}
.lesson-shell .sentence b{font-size:14px}
.lesson-shell .sentence:first-child{border-top:0;margin-top:0;padding-top:0}
.lesson-shell .callout{font-size:14px}
.lesson-plan{margin:22px 0}
.lesson-plan>summary{cursor:pointer;font-size:15px;padding:8px 0;min-height:42px}
.lesson-actions{display:flex;align-items:center;justify-content:space-between;gap:18px;margin:24px 0}
.lesson-extra{border-top:1px solid var(--line);margin:0;font-size:15px;background:transparent}
.lesson-extra>summary{cursor:pointer;padding:17px 0;min-height:52px;font-weight:500;font-size:15px;line-height:1.8}
.extra-body{padding:4px 0 20px}
.lesson-extra.source-box{font-size:14px;line-height:1.9}
.lesson-extra.source-box .text-link{font-size:15px}
.lesson-extra .source-line{font-size:14px;margin:12px 0}
.book-status-line{margin:0 0 22px;font-size:15px;color:var(--muted)}
.toc-group{margin:0 0 12px;padding:0;border:1px solid var(--line);border-radius:8px;background:var(--white);overflow:hidden}
.toc-group>summary{display:flex;align-items:center;gap:12px;padding:21px 24px;cursor:pointer;list-style:none;font-size:18px;font-weight:550}
.toc-group>summary::-webkit-details-marker{display:none}
.toc-group>summary:after{content:'+';font-size:22px;font-weight:400;color:var(--muted)}
.toc-group[open]>summary:after{content:'−'}
.toc-count{margin-left:auto;white-space:nowrap;color:var(--muted);font-size:14px;font-weight:400}
.toc-group .book-toc{margin:0;padding:0 24px 15px}
.footer-inner{align-items:center;font-size:13px}
.footer-links{display:flex;gap:24px}
.site-footer{margin-top:0}
@media(max-width:760px){
  .site-header nav{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:0 10px;font-size:13px}
  .site-header nav a{white-space:nowrap;padding:10px 0}
  .module-heading{padding:28px 0 22px}
  .module-heading h1{font-size:28px}
  .module-heading p{font-size:15px;margin-top:7px}
  .module-grid{gap:14px}
  .module-card{min-height:146px;display:block;padding:23px}
  .module-icon{width:40px;height:42px;margin-bottom:16px}
  .module-icon svg{width:25px;height:25px}
  .module-card h2{font-size:21px;margin-bottom:6px}
  .module-card p{font-size:15px;padding:0}
  .lesson-heading h1{font-size:25px}
  .lesson-row{grid-template-columns:26px minmax(0,1fr) auto;padding:20px;gap:14px}
  .lesson-row h2{font-size:19px}
  .lesson-row-end{gap:6px}
  .lesson-shell .panel{padding:24px}
  .study-modes{gap:20px;margin-top:20px}
  .study-modes a{font-size:14px}
  .resume-study{align-items:flex-start;gap:12px}
  .resume-study b{flex:1}
  .resume-study>span:first-child{white-space:nowrap}
  .toc-group>summary{padding:18px 20px;font-size:17px}
  .toc-group .book-toc{padding:0 18px 12px}
  .footer-inner{display:flex;gap:12px;flex-wrap:wrap}
}
@media(max-width:520px){
  .module-grid{grid-template-columns:1fr;gap:12px}
  .module-card{display:flex;align-items:center;min-height:108px;padding:20px;gap:17px;border-radius:9px}
  .module-icon{margin:0;width:40px;height:44px}
  .module-card h2{font-size:20px;margin-bottom:5px}
  .module-card p{font-size:14px}
  .module-arrow{top:14px;right:14px;font-size:15px}
  .lesson-row{grid-template-columns:24px minmax(0,1fr) auto;padding:20px 16px;gap:12px}
  .lesson-row h2{font-size:18px}
  .lesson-row p{font-size:14px}
  .lesson-number{font-size:14px}
  .lesson-row-end{display:grid;gap:0;text-align:center}
  .lesson-shell .panel{padding:22px 18px}
  .lesson-shell .steps b{font-size:16px}
  .lesson-shell .steps p{font-size:15px}
  .lesson-shell .field-meta{font-size:12px}
  .study-modes{gap:12px}
  .study-modes a{font-size:13px}
  .lesson-section-title{flex-wrap:wrap;gap:8px}
  .toc-group>summary{padding:17px 16px;gap:10px;font-size:16px}
  .toc-count{font-size:13px}
  .footer-inner>span:first-child{font-size:13px}
  .footer-links{gap:18px}
}
@media(max-width:350px){
  .site-header nav{gap:0 8px;font-size:12px}
  .module-card{padding:18px 16px;gap:13px;min-height:112px}
  .module-icon{width:36px;height:40px}
  .module-card h2{font-size:19px}
  .module-card p{font-size:14px}
  .study-modes{gap:8px}
  .study-modes a{font-size:12px}
  .resume-study{flex-wrap:wrap;font-size:13px}
}
/* 1.4：范文与真题使用同一课程ID，正文优先，拆解按段展开。 */
.lesson-group{margin-bottom:28px}.lesson-group-title{font-family:var(--sans);font-size:19px;margin:0 0 12px}
.sample-byline{color:var(--muted);font-size:15px}.essay-plan{margin:0 0 24px}.sample-link{border:1px solid var(--line);border-radius:6px;padding:20px;margin:20px 0;background:var(--paper)}.sample-link p{margin:5px 0 12px;color:var(--muted);font-size:14px}
.lesson-shell .essay-title{text-align:center;font-family:var(--serif);font-size:24px;margin:26px 0}.essay-paragraph{margin:0 0 24px}.essay-paragraph>p{font-family:var(--serif);font-size:18px;line-height:2.1;text-indent:2em;margin:0 0 6px}.essay-paragraph summary{font-size:14px;color:var(--green);cursor:pointer;padding:8px 0;min-height:40px}.paragraph-note{padding:15px 18px;background:var(--soft);border-radius:6px;font-size:15px;line-height:1.9}.paragraph-note b{display:block;margin-bottom:5px}.paragraph-note p{margin:0}.essay-paper .lesson-section-title{flex-wrap:wrap}.essay-paper .lesson-section-title>span{white-space:normal}
@media(max-width:520px){.study-modes{gap:8px;justify-content:space-between}.study-modes a{font-size:13px;white-space:nowrap}.essay-paragraph>p{font-size:17px}.lesson-shell .essay-title{font-size:22px}.lesson-group-title{font-size:18px}}
/* 1.5：题型入口直接可见，小题答案与材料提炼按需展开。 */
.practice-types{display:flex;flex-wrap:wrap;gap:10px;margin:0 0 18px}
.practice-types button{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:44px;padding:9px 16px;border:1px solid var(--line);border-radius:6px;color:var(--green);background:var(--white);font-size:15px}
.practice-types button[aria-pressed=true]{background:var(--green);color:white;border-color:var(--green)}
.practice-types button span{font-size:14px;opacity:.85}
.lesson-count{font-family:var(--sans);font-size:14px;font-weight:400;color:var(--muted);margin-left:12px;white-space:nowrap}
.task-brief,.answer-trace dl{margin:16px 0;display:grid;grid-template-columns:5em minmax(0,1fr);gap:8px 14px;font-size:15px}
.task-brief dt,.answer-trace dt{color:var(--muted)}
.task-brief dd,.answer-trace dd{margin:0;overflow-wrap:anywhere}
.short-answer-text{white-space:pre-wrap;font-size:17px;line-height:2.1;margin:18px 0 22px;overflow-wrap:anywhere}
.answer-trace{padding:20px 0;border-top:1px solid var(--line)}
.answer-trace h3{font-size:17px;line-height:1.7;margin:0}
.answer-trace dd:last-child{color:var(--green);font-weight:600}
@media(max-width:520px){.practice-types{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.practice-types button{padding:9px 8px}.task-brief,.answer-trace dl{grid-template-columns:1fr;gap:3px}.task-brief dd,.answer-trace dd{margin-bottom:10px}.short-answer-text{font-size:16px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}
@media print{.site-header,.site-footer,.button,.button-row,.mode-nav,.detail-aside,.toast,.toolbar{display:none!important}body{background:white}.shell{max-width:none;padding:0}.detail-grid{display:block}.panel{break-inside:avoid;box-shadow:none}.source-line a:after{content:" (" attr(href) ")";overflow-wrap:anywhere}textarea{min-height:200px}}