/* 目录是紧凑索引，正文保持独立阅读宽度；状态同时提供文字与图形。 */
body:has(#library:not([hidden])){min-width:0}
body:has(#library:not([hidden])) .topbar{max-width:1200px;min-height:72px;padding-block:14px}
main:has(#library:not([hidden])){max-width:1200px;padding-bottom:56px}
#library{margin:12px auto 0;--reading-surface:#fff;--index-active:#e8edf5}
.library-head{display:flex;justify-content:space-between;align-items:center;gap:24px;margin-bottom:20px}
.library-head h1{font-size:30px;line-height:1.35;font-weight:650;letter-spacing:-.025em}
.library-tabs{display:flex;align-items:center;gap:24px}
.library-tabs button{border:0;border-bottom:2px solid transparent;background:none;min-height:46px;min-width:44px;padding:8px 4px;color:var(--muted);font-size:15px}
.library-tabs button[aria-current=page]{border-bottom-color:var(--accent);color:var(--accent);font-weight:600}
.library-tabs button:hover{color:var(--accent)}
.library-toolbar{display:flex;align-items:center;justify-content:space-between;gap:24px;padding-bottom:12px}
.part-switch{display:flex;align-items:center;gap:4px;min-width:0}
.part-switch button{min-height:44px;padding:10px 16px;border:0;border-radius:7px;background:none;font-size:14px;color:var(--muted);white-space:nowrap}
.part-switch button[aria-pressed=true]{color:var(--accent-ink);background:var(--soft);font-weight:600}
.part-switch button:hover:not([aria-pressed=true]){background:#eceff4;color:var(--ink)}
.library-query{display:flex;align-items:center;gap:9px;position:relative;flex:0 1 330px;min-width:220px;background:var(--reading-surface);border:1px solid var(--line);border-radius:9px;padding-left:13px}
.library-query>svg{width:17px;height:17px;color:var(--muted)}
.library-query input{border:0;box-shadow:none;background:transparent;min-width:0;min-height:44px;padding:10px 44px 10px 0;font-size:14px;caret-color:var(--accent)}
.library-query input:focus{border:0;box-shadow:none;outline:none}
.library-query input::-webkit-search-cancel-button{-webkit-appearance:none;appearance:none}
.library-query:focus-within{border-color:var(--accent);box-shadow:inset 0 0 0 1px var(--accent)}
.library-query .icon{position:absolute;right:0;width:44px;min-width:44px;height:44px}
.library-query .icon svg{width:16px;height:16px}
.material-filters{display:flex;gap:10px}
.filter-select{position:relative;display:block;min-width:140px}
.filter-select select{-webkit-appearance:none;appearance:none;display:block;width:100%;height:46px;padding:10px 38px 10px 13px;border:1px solid var(--line);border-radius:9px;background:var(--reading-surface);color:var(--ink);font-family:inherit;font-weight:400;line-height:1.5;cursor:pointer}
.filter-select>svg{position:absolute;right:13px;top:50%;width:16px;height:16px;transform:translateY(-50%);color:var(--muted);pointer-events:none}
.filter-select select:hover{border-color:#b3bccd}
.filter-select:focus-within>svg{color:var(--accent)}
.library-result-bar{display:flex;align-items:center;gap:18px;min-height:48px;padding:0 0 12px}
.material-status{display:flex;align-items:center;gap:4px}
.material-status button{display:flex;align-items:center;gap:7px;min-height:44px;padding:8px 11px;border:0;border-radius:7px;background:none;color:var(--muted);font-size:13px;white-space:nowrap}
.material-status button span{font-size:11px;font-variant-numeric:tabular-nums;background:#e9edf3;padding:2px 5px;border-radius:4px;min-width:20px}
.material-status button[aria-pressed=true]{color:var(--ink);background:#e9edf3;font-weight:600}
.material-status button[aria-pressed=true] span{color:var(--ink);background:#fff}
.material-status button:hover{color:var(--accent)}
.library-count{margin-left:auto;font-size:12px;line-height:1.6;color:var(--muted);font-variant-numeric:tabular-nums}
.text-link{display:inline-flex;align-items:center;min-height:44px;padding:8px 0;border:0;background:none;color:var(--accent-ink);font-size:13px;line-height:1.6;text-align:left;text-decoration:none;text-underline-offset:4px}
.text-link:hover{text-decoration:underline}
/* 两区用底色和留白区分，不把导航与答案装进同一大框。 */
.library-layout{display:grid;grid-template-columns:310px minmax(0,1fr);gap:24px;min-height:560px;align-items:start}
.library-layout:has(.library-reading[hidden]){grid-template-columns:1fr}
.library-layout:has(.library-reading[hidden]) .library-index{position:static}
.library-index{min-width:0;position:sticky;top:16px;padding:0}
.topic-control{padding:0 4px 16px}
.topic-trigger{display:flex;align-items:center;gap:12px;width:100%;min-height:46px;padding:10px 13px;border:1px solid var(--line);border-radius:12px;background:#fff;color:var(--ink);font-size:14px;font-weight:400;text-align:left;line-height:1.5}
.topic-trigger>span{min-width:0;flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.topic-trigger>svg{flex-shrink:0;width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:1.7;color:var(--muted)}
.topic-trigger:hover{border-color:#b3bccd}
.topic-trigger[aria-expanded=true]{border-color:var(--accent);box-shadow:0 0 0 3px #3d61bb12}
.topic-trigger[aria-expanded=true]>svg{transform:rotate(180deg);color:var(--accent)}
.topic-popup{position:fixed;inset:auto;margin:0;padding:6px;border:1px solid #dfe4ec;border-radius:14px;background:#fff;color:var(--ink);box-shadow:0 12px 32px #25334d18,0 2px 6px #25334d0a;overflow:hidden}
.topic-options{overflow-y:auto;overscroll-behavior:contain;scroll-padding:4px;scrollbar-width:thin;scrollbar-color:#bac3d2 transparent;outline:none}
.topic-option{display:grid;grid-template-columns:minmax(0,1fr) auto 16px;align-items:center;gap:8px;min-height:44px;padding:10px;border-radius:8px;font-size:14px;line-height:1.5;cursor:pointer;overflow-wrap:anywhere}
.topic-option-count{font-size:12px;color:var(--muted);white-space:nowrap;font-variant-numeric:tabular-nums}
.topic-option>svg{width:15px;height:15px;fill:none;stroke:currentColor;stroke-width:1.8;visibility:hidden}
.topic-option[data-active=true]{background:#f0f3f8}
.topic-option[aria-selected=true]{color:var(--accent-ink);background:var(--index-active);font-weight:550}
.topic-option[aria-selected=true]>svg{visibility:visible}
.topic-option[data-active=true][aria-selected=true]{background:#dfe7f3}
@media(forced-colors:active){.topic-trigger,.topic-popup{border-color:ButtonText}.topic-option[data-active=true]{outline:1px solid Highlight}.topic-option[aria-selected=true]{color:Highlight}}
#library-list{overflow:auto;max-height:calc(100dvh - 132px);scroll-padding:8px;padding:0 8px 8px 0;scrollbar-width:thin;scrollbar-color:#b3bccd transparent}
#library-list::-webkit-scrollbar{width:4px}
#library-list::-webkit-scrollbar-thumb{background:#b3bccd;border-radius:4px}
.index-topic{display:flex;justify-content:space-between;align-items:baseline;gap:12px;font-size:13px;font-weight:650;line-height:1.5;color:var(--ink);padding:24px 10px 9px;overflow-wrap:anywhere;margin:0}
.index-topic:first-child{padding-top:4px}
.topic-count{font-size:11px;font-weight:400;color:var(--muted);white-space:nowrap}
.library-row{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:4px 10px;align-items:start;width:100%;min-height:44px;padding:10px;margin:2px 0;text-align:left;border:0;border-radius:7px;background:none}
.library-row:hover{background:#edf0f5}
.library-row[aria-current=true]{background:var(--index-active)}
.entry-title{grid-column:1/-1;font-size:14px;line-height:1.5;font-weight:400;overflow-wrap:anywhere}
.library-row[aria-current=true] .entry-title{color:var(--accent-ink);font-weight:550}
.entry-meta{font-size:11px;line-height:1.5;color:var(--muted);min-width:0;overflow-wrap:anywhere}
.entry-state{grid-column:2;justify-self:end;align-self:center;color:var(--muted);display:inline-flex;align-items:center;justify-content:center;gap:4px;white-space:nowrap;font-size:11px}
.library-row[data-numbered=true] .entry-state{grid-column:3;width:16px}
.library-row:has(.entry-state):not([data-numbered=true]):not(:has(.entry-meta)) .entry-title{grid-column:1}
.entry-state svg{width:13px;height:13px;stroke-width:1.8}
.entry-state[data-available=true]{color:var(--success)}
.library-row[data-numbered=true]{grid-template-columns:20px minmax(0,1fr) 16px;gap:8px}
.library-row[data-numbered=true] .entry-title{grid-column:2}
.entry-number{color:var(--muted);font-size:12px;line-height:21px;font-variant-numeric:tabular-nums;padding-top:1px}
.library-row[aria-current=true] .entry-number{color:var(--accent-ink)}
.library-reading{min-width:0;min-height:560px;background:var(--reading-surface);border-radius:14px;scroll-margin-top:16px}
.library-detail-nav{display:flex;align-items:center;gap:6px;padding:10px 30px;min-height:64px;border-bottom:1px solid #eef0f4}
.library-return-question{color:var(--accent-ink);margin-right:8px;white-space:nowrap}
#library-back{display:none}
#library-position{margin-right:auto;font-size:12px;color:var(--muted);font-variant-numeric:tabular-nums}
.library-detail-nav .quiet{font-size:13px;padding-inline:8px}
.library-detail-nav svg{width:16px;height:16px}
.library-detail{padding:28px 36px 40px;min-width:0;outline:none}
.detail-title{font-size:28px;font-weight:600;line-height:1.35;letter-spacing:-.025em;overflow-wrap:anywhere;text-wrap:pretty;max-width:34ch}
.detail-meta{margin-top:12px;font-size:12px;color:var(--muted);line-height:1.75}
.question-prompt{font-size:18px;line-height:1.7;margin-top:24px;text-wrap:pretty}
.question-cues{padding-left:20px;margin:14px 0 0;font-size:14px;line-height:1.8;color:var(--muted)}
.question-cues li+li{margin-top:3px}
.study-section{margin-top:28px;padding-top:0}
.study-section :is(h3,h4,h5){font-size:14px;font-weight:650;line-height:1.6;margin:0 0 10px;color:var(--ink)}
.tips-list{margin:0;padding-left:19px;font-size:14px;line-height:1.9;overflow-wrap:anywhere}
.tips-list li+li{margin-top:8px}
.keyword-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px 22px;margin:0 0 8px}
.keyword-list dt{font-size:14px;line-height:1.5;color:var(--ink);overflow-wrap:anywhere;font-weight:500}
.keyword-list dd{margin:5px 0 0;font-size:12px;line-height:1.6;color:var(--muted);overflow-wrap:anywhere}
.answer-outline{list-style:none;margin:0 0 20px;padding:0;display:grid;gap:8px;font-size:14px;line-height:1.8;color:var(--ink);overflow-wrap:anywhere}
.section-caption{font-size:12px;color:var(--muted);margin-bottom:12px}
.answer-keypoints{font-size:15px;line-height:1.8;overflow-wrap:anywhere;margin-bottom:8px;color:var(--ink)}
.study-section>.text-link{margin-right:20px;margin-bottom:6px}
.missing-text{margin:0;font-size:13px;line-height:1.8;color:var(--muted)}
.answer-options{display:flex;align-items:center;justify-content:flex-end;gap:16px;margin-top:-6px;margin-bottom:8px}
.answer-word-count{margin-left:12px;font-weight:400;color:var(--muted);font-size:12px;font-variant-numeric:tabular-nums}
.answer-choices{display:flex;gap:14px}
.answer-choices .text-link{min-height:44px;font-size:12px;color:var(--muted)}
.answer-choices [aria-pressed=true]{color:var(--accent-ink);font-weight:600}
.full-answer{font-size:18px;line-height:1.85;overflow-wrap:anywhere;color:var(--ink);max-width:70ch}
.full-answer p+p{margin-top:18px}
.guide-links,.related-links{display:flex;flex-wrap:wrap;gap:4px 20px}
.related-links{display:grid;gap:4px}
.related-links .text-link{color:var(--muted);font-size:13px;line-height:1.65}
.related-links .text-link:hover{color:var(--accent)}
.practice-targets{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;margin:28px 0 0;padding:18px 0;border-block:1px solid #edf0f5}
.practice-targets dt{font-size:12px;color:var(--muted);line-height:1.5}
.practice-targets dd{font-size:17px;font-weight:600;line-height:1.7;margin:7px 0 0}
.method-steps{margin:0;padding-left:24px;font-size:16px;line-height:1.9}
.method-steps li{padding-left:6px}
.method-steps li+li{margin-top:16px}
.method-steps li::marker{color:var(--accent);font-weight:600;font-size:13px}
.method-phrases{display:grid;gap:18px;margin:0}
.method-phrases dt{font-size:16px;line-height:1.8;color:var(--accent-ink);overflow-wrap:anywhere}
.method-phrases dd{font-size:13px;line-height:1.6;margin:5px 0 0;color:var(--muted)}
.method-notes,.reading-text,.material-reading{font-size:14px;line-height:1.9;overflow-wrap:anywhere;white-space:pre-wrap}
.method-notes p+p,.reading-text p+p,.material-reading p+p{margin-top:12px}
.material-reading{margin-top:26px}
.library-start{margin-top:32px}
.index-empty{padding:24px 12px}
.index-empty h2{font-size:16px;line-height:1.6;margin-bottom:8px}
.index-empty p{font-size:13px;color:var(--muted);line-height:1.8}
@media(max-width:1000px){.library-layout{grid-template-columns:276px minmax(0,1fr);gap:18px}.library-detail{padding-inline:28px}.library-toolbar{gap:14px}.part-switch button{padding-inline:12px}.library-query{flex-basis:270px}.library-detail-nav{padding-inline:20px}.library-tabs{gap:20px}}
@media(max-width:900px){
 body:has(#library:not([hidden])) .topbar{min-height:72px}
 #library{margin-top:16px}.library-head{display:block;margin-bottom:22px}.library-head h1{font-size:27px}.library-tabs{gap:26px;margin-top:14px}.library-tabs button{font-size:14px}
 .library-toolbar{display:flex;flex-direction:column;align-items:stretch;gap:14px;padding-bottom:10px}.part-switch{overflow:auto;scrollbar-width:none}.part-switch::-webkit-scrollbar{display:none}.part-switch button{flex:1;padding-inline:10px;min-width:max-content;font-size:13px}
 .library-query{flex:0 0 auto;min-width:0;width:100%}.library-query input{font-size:16px}.library-query>svg{width:16px;height:16px}.material-filters{display:grid;grid-template-columns:repeat(2,minmax(0,1fr))}.filter-select{min-width:0}.filter-select select{font-size:16px}
 .library-result-bar{flex-wrap:wrap;column-gap:12px;row-gap:0;padding-bottom:12px}.material-status{gap:4px;width:100%}.material-status button{min-height:44px}.library-count{margin-left:0}.library-result-bar>.text-link{margin-left:auto;min-height:44px;font-size:12px}
 .library-layout{grid-template-columns:1fr;min-height:0;gap:0}.library-index{position:static;padding:8px 0 24px}.topic-control{padding:0 0 12px}.topic-trigger,.topic-option{font-size:16px}#library-list{max-height:none;padding:0}.index-topic{padding:24px 10px 10px;font-size:14px}.index-topic:first-child{padding-top:8px}
 .library-row{padding:12px 10px;margin:2px 0;gap:6px;border-radius:7px}.library-row[data-numbered=true]{grid-template-columns:22px minmax(0,1fr) 16px;gap:10px}.entry-title{font-size:15px}.entry-number{font-size:12px;line-height:23px}.entry-meta{font-size:12px}
 .library-reading{min-height:0;border-left:0;scroll-margin-top:8px;background:var(--reading-surface);border-radius:12px;overflow:clip}.library-detail-nav{padding:8px 12px;position:sticky;top:0;z-index:1;background:var(--reading-surface);gap:2px;border-bottom-color:var(--line)}#library-back{display:inline-flex;color:var(--accent-ink);margin-right:auto;padding-left:0}#library-position{margin-right:0;white-space:nowrap}.library-detail-nav .quiet{font-size:12px;padding-inline:5px;white-space:nowrap}.library-detail-nav svg{width:14px;height:14px}
 .library-detail{padding:24px 22px 32px}.detail-title{font-size:23px;line-height:1.4}.detail-meta{font-size:12px;margin-top:10px}.question-prompt{font-size:17px;margin-top:20px}.question-cues{font-size:14px}.study-section{margin-top:26px;padding-top:0}.study-section :is(h3,h4,h5){margin-bottom:10px}
 .keyword-list{gap:14px 16px}.keyword-list dt{font-size:14px}.full-answer{font-size:17px;line-height:1.85}.practice-targets{gap:12px;padding-block:16px}.practice-targets dd{font-size:15px}.method-steps{font-size:15px}.method-phrases dt{font-size:15px}
 .library-detail-nav:has(#library-return-question:not([hidden])){flex-wrap:wrap}.library-return-question{flex-basis:100%;justify-content:flex-start;margin-right:0;padding-left:0}
 #library[data-view=list] .library-reading{display:none}#library[data-view=detail] .library-index{display:none}
}
@media(max-width:359px){.part-switch button{padding-inline:7px;font-size:12px}.library-detail{padding-inline:18px}.library-detail-nav{flex-wrap:wrap}#library-back{font-size:11px}.keyword-list{grid-template-columns:1fr}.practice-targets{gap:10px}.practice-targets dd{font-size:14px}.detail-title{font-size:21px}}
@media(forced-colors:active){.filter-select select{border-color:ButtonText}.filter-select>svg{color:ButtonText}.library-row[aria-current=true]{outline:1px solid Highlight}.part-switch button[aria-pressed=true]{outline:1px solid Highlight}}

/* P2与关联P3连续阅读，共用参考词汇不在每道追问下重复。 */
.followup-section{margin-top:40px;padding-top:28px;border-top:1px solid var(--line)}
.followup-section>h3{font-size:20px;margin-bottom:24px}
.followup-question{padding:0 0 24px;margin:0 0 24px;border-bottom:1px solid #edf0f5}
.followup-question:last-of-type{margin-bottom:0}
.followup-section .followup-title{display:flex;align-items:baseline;gap:12px;font-size:18px;line-height:1.6;font-weight:550;margin:0 0 12px;overflow-wrap:anywhere;text-wrap:pretty}
.followup-number{flex-shrink:0;color:var(--muted);font-size:12px;font-weight:400;font-variant-numeric:tabular-nums}
.followup-question>.study-section{margin-top:20px;margin-left:28px}
.followup-question>.missing-text{margin-left:28px}
.followup-title:focus{outline:none}
@media(max-width:900px){.followup-section{margin-top:32px;padding-top:24px}.followup-section .followup-title{font-size:17px}.followup-question>.study-section,.followup-question>.missing-text{margin-left:0}}

/* 案例留在独立浮层，不进入个人答案与记忆点。 */
.reference-trigger{display:inline-flex;align-items:center;min-height:44px;margin-top:12px;padding:8px 12px;border:1px solid var(--line);border-radius:9px;background:#fff;color:var(--accent-ink);font-size:13px;line-height:1.5}
.reference-trigger:hover,.reference-trigger[aria-expanded=true]{background:#f0f3f8;border-color:#bdc9dc}
.reference-popup{box-sizing:border-box;position:fixed;inset:auto;margin:0;padding:16px 20px;border:1px solid #dfe4ec;border-radius:14px;background:#fff;color:var(--ink);box-shadow:0 12px 32px #25334d20,0 2px 6px #25334d0a;overflow:auto;overscroll-behavior:contain;scrollbar-width:thin;scrollbar-color:#bac3d2 transparent}
.reference-header{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:8px}
.reference-header h3{font-size:15px;font-weight:600;margin:0}
.reference-header .icon{width:44px;height:44px;flex-shrink:0}
.reference-header .icon svg{width:16px;height:16px}
.reference-body{font-size:16px;line-height:1.75;overflow-wrap:anywhere}
.reference-body p{margin:0 0 12px}
.reference-body p:last-child{margin-bottom:0}
.reference-keypoints{font-size:13px;line-height:1.65;color:var(--muted);padding-bottom:12px;border-bottom:1px solid var(--line)}
.reference-outline{padding-left:20px;margin:8px 0 0}
.reference-outline li{padding-left:2px;margin:6px 0}
.reference-count{font-size:12px;color:var(--muted)}
.reference-body+.reference-body{margin-top:20px;padding-top:20px;border-top:1px solid var(--line)}
@media(max-width:900px){.reference-popup{padding:12px 16px}.reference-trigger{font-size:14px}}
@media(forced-colors:active){.reference-trigger,.reference-popup{border-color:ButtonText}.reference-trigger[aria-expanded=true]{outline:1px solid Highlight}}

/* 编辑入口与标题同行，输入区使用现有按钮、焦点和颜色。 */
.editable-section-head,.pending-answer{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:10px}
.study-section .editable-section-head>:is(h3,h5){margin:0;min-width:0}
.section-edit{flex-shrink:0;min-height:44px;padding:8px 10px;font-size:13px;color:var(--accent-ink)}
.section-editor textarea{display:block;width:100%;min-height:120px;resize:vertical;border:1px solid var(--line);border-radius:9px;padding:12px 14px;background:var(--surface);font-size:16px;line-height:1.8}
.section-editor textarea:focus{border-color:var(--accent);box-shadow:inset 0 0 0 1px var(--accent)}
.editor-help{margin-top:8px;font-size:13px;line-height:1.6;color:var(--muted)}
.editor-actions{display:flex;justify-content:flex-end;align-items:center;gap:12px;margin-top:16px}
.editor-actions button{min-height:44px}
.editor-error{margin-top:12px;color:var(--danger);font-size:14px;line-height:1.6;overflow-wrap:anywhere}
.pending-answer{margin-left:28px}
@media(max-width:900px){.pending-answer{margin-left:0}.answer-word-count{margin-left:8px}.editor-actions .primary{min-width:88px}}