/* 知学 · 默认书架(2026-09-24):首页书架网格、阅读页 book.html、来源页 sources.html、「跟先生学这一段」(lesson.html 的段落模式)
   只用 styles.css 的色板变量;不改 styles.css。段落模式的规则都挂在 .passage-mode 下,不碰月亮课。 */

/* ── 首页书架(在 .entry-section 的纸色底上) ── */
.shelf{margin-top:58px;padding-top:40px;border-top:1px solid #d8d1c1;scroll-margin-top:16px}
.shelf-head{display:flex;justify-content:space-between;align-items:end;flex-wrap:wrap;gap:8px 24px;margin-bottom:22px}
.shelf-head h3{margin:0;font:700 clamp(24px,2.6vw,32px)/1.3 var(--serif);letter-spacing:-.01em}
.shelf-head p{margin:0;font-size:13px;color:#526269}
.shelf-head a{color:#8d5f2a;font-weight:700;text-decoration:none;white-space:nowrap}
.shelf-head a:hover{text-decoration:underline}
.shelf-grid{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(212px,1fr));gap:12px}
.shelf-grid>li{display:flex;min-width:0}
.shelf-card{position:relative;flex:1;min-width:0;display:flex;flex-direction:column;gap:5px;min-height:200px;padding:20px 20px 16px;background:#fffcf5;border:1px solid #d8d1c1;color:var(--ink);text-decoration:none;transition:transform .18s ease,border-color .18s ease,box-shadow .18s ease}
.shelf-card:before{content:"";position:absolute;inset:6px;border:1px solid #eee5d4;pointer-events:none}
.shelf-card:hover{transform:translateY(-3px);border-color:#bda879;box-shadow:6px 6px 0 #e4d9c2}
.shelf-card:focus-visible{outline:2px solid #9a7d52;outline-offset:3px}
.shelf-tag{position:absolute;top:15px;right:15px;padding:0 7px;border:1px solid #bda879;color:#856938;font-size:10px;font-weight:700;letter-spacing:.08em;line-height:1.8}
.shelf-tag.is-part{border-style:dashed}
.shelf-title{padding-right:46px;font:700 26px/1.25 var(--serif);letter-spacing:.02em;overflow-wrap:anywhere}
.shelf-meta{font-size:11px;letter-spacing:.05em;color:#7f6c54;overflow-wrap:anywhere}
.shelf-blurb{margin-top:4px;font-size:12.5px;line-height:1.75;color:#58666c;overflow-wrap:anywhere}
.shelf-size{display:flex;justify-content:space-between;align-items:center;gap:8px;margin-top:auto;padding-top:10px;border-top:1px dashed #ddd2bd;font-size:11px;color:#6f7775}
.shelf-size b{font-weight:400;color:#8d5f2a}

/* ── 阅读页 book.html ── */
.reader-page{padding-top:28px;padding-bottom:80px}
.book-status{margin:40px 0;padding:18px 20px;border:1px solid var(--line);background:var(--night-2);font-size:14px;color:#d3d9d3}
.book-status a{color:var(--gold-light);font-weight:700;margin-left:6px}
.book-view{display:grid;grid-template-columns:236px minmax(0,1fr);gap:28px;align-items:start}
.book-toc{position:sticky;top:16px;display:flex;flex-direction:column;max-height:calc(100vh - 32px);border:1px solid var(--line);background:var(--night-2);min-width:0}
.toc-toggle{display:none}
.toc-panel{display:flex;flex-direction:column;min-height:0}
.toc-book{padding:18px 18px 13px;border-bottom:1px solid var(--line)}
.toc-book small{display:block;font-size:10px;letter-spacing:.14em;color:var(--gold)}
.toc-book strong{display:block;margin-top:4px;font:700 21px/1.35 var(--serif);overflow-wrap:anywhere}
.toc-list{position:relative;list-style:none;margin:0;padding:6px 0;overflow-y:auto;overscroll-behavior:contain;min-height:0}
.toc-list button{display:flex;gap:10px;width:100%;padding:7px 16px 7px 14px;border:0;border-left:2px solid transparent;background:none;color:#c9d4d2;font-size:13px;line-height:1.55;text-align:left}
.toc-list button:hover{color:var(--gold-light);background:#ffffff08}
.toc-list button[aria-current=true]{color:var(--gold);border-left-color:var(--gold);background:#ffffff0f;font-weight:700}
.toc-num{flex:none;min-width:2.1em;font:11px/2.05 Georgia,serif;color:#7f959a}
.toc-name{min-width:0;overflow-wrap:anywhere}

.book-reader{min-width:0;padding:26px clamp(20px,5vw,64px) 34px;background:var(--paper-2);color:var(--ink);border:1px solid #d6c7ab;box-shadow:11px 11px 0 #1c313b;scroll-margin-top:12px}
.book-reader>*{max-width:740px;margin-inline:auto}
.reader-tools{display:flex;justify-content:flex-end;align-items:center;flex-wrap:wrap;gap:10px 18px;padding-bottom:12px;border-bottom:1px solid #d4c8b4}
.seg-wrap{display:inline-flex;align-items:center;gap:8px;font-size:11px;color:#8d6f47}
.seg{display:inline-flex;border:1px solid #bcae92;border-radius:3px;overflow:hidden}
.seg button{min-height:32px;padding:4px 13px;border:0;background:transparent;color:#5b5140;font-size:12px}
.seg button+button{border-left:1px solid #bcae92}
.seg button:hover{background:#f3e8d2}
.seg button[aria-pressed=true]{background:#24313a;color:#fffaf0;font-weight:700}
.reader-head{padding:26px 0 18px;margin-bottom:12px;border-bottom:1px solid #e3d8c3}
.reader-head .eyebrow{margin:0 0 8px;color:#8d6f47}
.reader-head h1{margin:0;font:700 clamp(34px,4vw,50px)/1.25 var(--serif);letter-spacing:-.02em;overflow-wrap:anywhere}
.reader-head h2{margin:8px 0 0;font:400 clamp(20px,2vw,25px)/1.5 var(--serif);color:#7a5a2e;overflow-wrap:anywhere}
.reader-hint{margin:12px 0 0;font-size:11px;color:#8a8f88}
.chapter-body{padding:4px 0}
.chapter-body>p{margin:0 -14px;padding:9px 14px;border-left:2px solid transparent;border-radius:2px;font:17px/2.05 var(--serif);color:#2c3a40;white-space:pre-line;overflow-wrap:anywhere;cursor:pointer;transition:background .15s ease}
.chapter-body>p+p{margin-top:4px}
.chapter-body>p:hover{background:#f6eedc}
.chapter-body>p:focus-visible{outline:2px solid #b8893f;outline-offset:1px}
.chapter-body>p.is-selected{background:#f4e3bd;border-left-color:#b8893f}
.book-reader.is-large .chapter-body>p{font-size:20.5px;line-height:2.1}
.chapter-empty{font-size:13px;color:#7a8580}
.para-actions{display:flex;align-items:center;flex-wrap:wrap;gap:10px 16px;margin:6px -14px 16px;padding:12px 14px;background:#24313a;color:var(--paper);border-radius:2px}
.para-actions-note{margin-right:auto;font-size:11px;color:#b9c8c8}
.para-actions .button{min-height:42px;gap:16px}
.para-actions .quiet-button{color:var(--gold-light)}
.chapter-nav{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:34px;padding-top:20px;border-top:1px solid #d4c8b4}
.chapter-nav button{display:grid;align-content:center;gap:1px;min-height:64px;min-width:0;padding:10px 16px;border:1px solid #cdbf9f;background:#fffdf7;color:var(--ink);text-align:left}
.chapter-nav button small{font-size:11px;color:#8d6f47}
.chapter-nav button span{font:700 15px/1.45 var(--serif);overflow-wrap:anywhere}
.chapter-nav .next-ch{text-align:right}
.chapter-nav button:hover:not(:disabled){border-color:#9a7d52;background:#fff6e6}
.chapter-nav button:disabled{opacity:.38}
.reader-source{margin-top:20px;font-size:11px;color:#6f7b7a}
.reader-source a{color:#395e6e;margin-right:12px}

/* ── 来源页 sources.html ── */
.sources-page{padding-top:40px;padding-bottom:80px}
.sources-page h1{margin:0;font:700 clamp(40px,5vw,64px)/1.2 var(--serif);letter-spacing:-.03em}
.sources-lead{max-width:700px;margin:22px 0 8px;padding-left:13px;border-left:2px solid var(--gold);font-size:16px;line-height:1.9;color:#d3d9d3}
.sources-updated{grid-column:1/-1;font-size:11px;color:var(--muted);margin:0}
.sources-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin-top:30px}
.source-card{min-width:0;padding:22px 26px 20px;background:var(--paper-2);color:var(--ink);border:1px solid #d6c7ab;scroll-margin-top:16px}
.source-card:target{outline:2px solid var(--gold);outline-offset:3px}
.source-card-head{display:flex;justify-content:space-between;align-items:baseline;gap:12px;padding-bottom:10px;border-bottom:1px solid #d4c8b4}
.source-card h2{margin:0;font:700 26px/1.3 var(--serif);overflow-wrap:anywhere}
.source-card-head span{flex:none;padding:0 7px;border:1px solid #bda879;color:#856938;font-size:10px;font-weight:700;letter-spacing:.08em;line-height:1.8}
.source-card dl{margin:10px 0 14px}
.source-card dl>div{display:grid;grid-template-columns:6.5em minmax(0,1fr);gap:10px;padding:6px 0;border-bottom:1px solid #ece3d1;font-size:12.5px;line-height:1.7}
.source-card dt{color:#8d6f47}
.source-card dd{margin:0;color:#34444a;overflow-wrap:anywhere}
.source-card dd a{color:#395e6e}
.source-read{font-size:13px;font-weight:700;color:#8d5f2a;text-decoration:none}
.source-read:hover{text-decoration:underline}

/* ── 跟先生学这一段(lesson.html?book=&ch=&p=) ── */
html.zx-passage-boot .lesson-page{visibility:hidden}
.passage-mode .lesson-breadcrumb a{text-decoration:none}
.passage-mode .lesson-breadcrumb a:hover{color:var(--gold-light)}
.passage-mode .lesson-heading h1{font-size:clamp(40px,4.8vw,66px);overflow-wrap:anywhere}
.passage-mode .lesson-heading h1 em{font-size:.72em}
.passage-mode .book-lead{font-size:16px}
.passage-mode .book-body .passage-text{margin:18px 0;font:18px/2.1 var(--serif);color:#2c3a40;white-space:pre-line;overflow-wrap:anywhere}
.passage-mode .passage-text .sent.is-key{background:#f3dfae;box-shadow:0 0 0 2px #f3dfae;border-radius:1px}
.passage-mode .source-line a{margin-right:4px}
.sentence-list{display:grid;gap:8px}
.passage-mode .sentence-choice{font:15px/1.8 var(--serif);white-space:pre-line;overflow-wrap:anywhere}
.passage-mode .sentence-choice[aria-pressed=true]{border-color:var(--gold);background:#3b4231;box-shadow:inset 3px 0 0 var(--gold)}
.passage-mode .stage-actions .button.text-button{min-height:48px}
.passage-mode .reflection-card dd{white-space:pre-line;overflow-wrap:anywhere}
.passage-mode .reflection-card dd.is-empty{color:#8ea3a7}
.passage-missing{margin:24px 0 0;font-size:14px;color:#b9c8c8}
.passage-missing a{color:var(--gold-light);font-weight:700;margin-right:14px}

@media(max-width:1000px){.book-view{grid-template-columns:200px minmax(0,1fr);gap:20px}
.book-reader{padding-inline:28px}
}

@media(max-width:760px){.shelf{margin-top:44px;padding-top:30px}
.shelf-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.shelf-card{min-height:176px;padding:15px 13px 12px}
.shelf-card:before{inset:4px}
.shelf-tag{position:static;align-self:flex-start;margin-bottom:2px}
.shelf-title{padding-right:0;font-size:21px}
.shelf-blurb{font-size:12px;line-height:1.7}
.shelf-size{flex-wrap:wrap;gap:2px 8px}

.reader-page{padding-top:16px;padding-bottom:56px}
.book-view{grid-template-columns:minmax(0,1fr);gap:14px}
.book-toc{position:static;max-height:none;border:0;background:none}
.toc-toggle{display:flex;justify-content:space-between;align-items:center;gap:12px;width:100%;min-height:46px;padding:9px 16px;border:1px solid var(--line);background:var(--night-2);color:var(--paper);font-size:14px;text-align:left}
.toc-toggle:after{content:"▾";color:var(--gold)}
.book-toc.is-open .toc-toggle:after{content:"▴"}
.toc-panel{display:none}
.book-toc.is-open .toc-panel{display:flex;max-height:min(62vh,460px);border:1px solid var(--line);border-top:0;background:var(--night-2)}
.toc-book{display:none}
.toc-list button{padding-block:9px}
.book-reader{padding:16px 18px 26px;box-shadow:6px 6px 0 #1c313b}
.reader-tools{justify-content:flex-start}
.reader-head{padding-top:18px}
.chapter-body>p{margin-inline:-10px;padding:8px 10px;font-size:16.5px}
.book-reader.is-large .chapter-body>p{font-size:19.5px}
.para-actions{margin-inline:-10px;padding:10px}
.para-actions .button{flex:1 1 auto}
.chapter-nav{gap:8px}
.chapter-nav button{padding:9px 11px}

.sources-page{padding-top:26px}
.sources-list{grid-template-columns:minmax(0,1fr)}
.source-card{padding:18px 16px 16px}
.source-card dl>div{grid-template-columns:5.6em minmax(0,1fr);gap:8px}

.passage-mode .book-body .passage-text{font-size:17px}
}

@media(max-width:340px){.shelf-grid{grid-template-columns:minmax(0,1fr)}
}

@media(prefers-reduced-motion:reduce){.shelf-card,.chapter-body>p{transition:none}
}

/* 书名只在空格处折行(「大学 · 中庸」不拆成「中/庸」),放不下再硬折 */
.shelf-title{word-break:keep-all;overflow-wrap:anywhere}

/* ── 阅读页 AI 先生(09-25,reader-coach.js):宽屏是正文右侧固定列,窄屏是底部抽屉 + 「问先生」按钮 ──
   面板里沿用 styles.css 的 .coach-*(深色);这里只加布局和阅读页特有的几块。 */
.reader-coach{min-width:0}
.reader-coach[hidden]{display:none}
.reader-coach .rc{border-top:0;padding:16px 16px 14px;gap:10px;display:flex;flex-direction:column;flex:1 1 auto;min-height:0}
.reader-coach .rc>*{flex:none}
.reader-coach .rc>.rc-log{flex:1 1 auto}
.rc .coach-head{gap:10px}
.rc .coach-titles h3{font-size:18px}
.rc-close{display:none;flex:none;width:36px;height:36px;padding:0;border:1px solid var(--line);background:none;color:var(--paper);font-size:20px;line-height:1;border-radius:50%;align-items:center;justify-content:center}
.rc-close:hover{border-color:var(--gold);color:var(--gold)}
.rc-spot{margin:0;padding:8px 10px;border-left:2px solid var(--gold);background:#ffffff0a;font-size:12px;line-height:1.65;color:#d3d9d3;overflow-wrap:anywhere}
.rc-spot b{margin-right:8px;font-weight:700;color:var(--gold);letter-spacing:.06em}
.reader-coach[data-selected=""] .rc-spot span{color:#9db2b5}
.rc-quick{display:flex;flex-wrap:wrap;gap:6px}
.rc-q{border:1px solid #60777f;background:#1f323b;color:#e6e0d2;font-size:12px;line-height:1.5;padding:5px 11px;border-radius:3px;min-height:32px}
.rc-q:hover:not(:disabled){border-color:var(--gold);color:var(--gold-light)}
.rc-q:disabled{opacity:.5}
.rc-log{max-height:none;min-height:150px;align-content:start}
.rc-empty{margin:0;font-size:12px;line-height:1.75;color:#9db2b5}
.rc .coach-row{max-width:100%}
.rc .coach-ai .rc-md{padding:8px 12px;background:#233941;border-left:2px solid var(--gold);font-size:13px;line-height:1.8;color:#e9ece6;overflow-wrap:anywhere;max-width:100%;min-width:0}
.rc .coach-ai .rc-md:empty{display:none}
.rc .coach-ai .rc-md p{padding:0;background:none;border:0;font-size:inherit;line-height:inherit;white-space:normal;color:inherit}
.rc .coach-ai .rc-wait{color:#c8d3d0}
.rc .coach-row.is-pending .rc-wait{animation:coach-pulse 1.2s ease-in-out infinite}
.rc-md>*{margin:0}
.rc-md>*+*{margin-top:.55em}
.rc-md ul,.rc-md ol{padding-left:1.4em}
.rc-md li+li{margin-top:.2em}
.rc-md h4{font:700 14px/1.6 var(--serif);color:var(--gold-light)}
.rc-md strong{color:var(--gold-light)}
.rc-md code{padding:0 4px;background:#12222c;border-radius:2px;font-size:.92em}
.rc-md pre{padding:8px 10px;background:#12222c;overflow-x:auto;white-space:pre-wrap}
.rc-md pre code{padding:0;background:none}
.rc-md blockquote{padding-left:10px;border-left:2px solid #60777f;color:#c8d3d0;font-family:var(--serif)}
.rc-form textarea{min-height:0;resize:none;font-size:14px}
.rc .coach-actions{gap:10px}
.rc .coach-send{min-height:38px}
.rc-sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.rc-gate:empty,.rc-gate[hidden]{display:none}
.rc-fab,.rc-scrim{display:none}
.para-actions .para-ask{color:var(--gold-light)}

/* 宽屏:三栏(目录 · 正文 · 先生),先生一列随页面吸顶,对话区在列内滚动 */
@media(min-width:1000px){
.book-view:has(.reader-coach:not([hidden])){grid-template-columns:200px minmax(0,1fr) 340px;gap:20px}
.book-view:has(.reader-coach:not([hidden])) .book-reader{padding-inline:clamp(24px,3vw,44px)}
.reader-coach{position:sticky;top:16px;max-height:var(--rc-max,calc(100vh - 32px));border:1px solid var(--line);background:var(--night-2);display:flex;flex-direction:column}
.para-actions .para-ask{display:none}
}
@media(min-width:1400px){
.book-view:has(.reader-coach:not([hidden])){grid-template-columns:236px minmax(0,1fr) 360px;gap:26px}
}
/* 1000–1199:三栏太挤,目录收成正文上方的折叠条(同手机的目录按钮),正文 + 先生两栏 */
@media(min-width:1000px) and (max-width:1199.98px){
.book-view:has(.reader-coach:not([hidden])){grid-template-columns:minmax(0,1fr) 320px;grid-template-areas:"toc coach" "reader coach";gap:14px 20px}
.book-view:has(.reader-coach:not([hidden])) .book-toc{grid-area:toc;position:relative;top:auto;max-height:none;border:0;background:none;z-index:5}
.book-view:has(.reader-coach:not([hidden])) .book-reader{grid-area:reader}
.book-view:has(.reader-coach:not([hidden])) .reader-coach{grid-area:coach}
.book-view:has(.reader-coach:not([hidden])) .toc-toggle{display:flex;justify-content:space-between;align-items:center;gap:12px;width:100%;min-height:46px;padding:9px 16px;border:1px solid var(--line);background:var(--night-2);color:var(--paper);font-size:14px;text-align:left}
.book-view:has(.reader-coach:not([hidden])) .toc-toggle:after{content:"▾";color:var(--gold)}
.book-view:has(.reader-coach:not([hidden])) .book-toc.is-open .toc-toggle:after{content:"▴"}
.book-view:has(.reader-coach:not([hidden])) .toc-panel{display:none}
.book-view:has(.reader-coach:not([hidden])) .book-toc.is-open .toc-panel{display:flex;position:absolute;left:0;right:0;top:100%;max-height:min(62vh,460px);border:1px solid var(--line);border-top:0;background:var(--night-2);box-shadow:0 12px 24px #0008}
.book-view:has(.reader-coach:not([hidden])) .toc-book{display:none}
}

/* 窄屏:底部抽屉,默认收起成右下角「问先生」 */
@media(max-width:999.98px){
.reader-page:has(~ .rc-fab){padding-bottom:96px}
.reader-coach{position:fixed;left:0;right:0;bottom:0;z-index:60;height:70vh;height:70dvh;background:var(--night-2);border-top:1px solid var(--gold);box-shadow:0 -12px 32px #0009;border-radius:14px 14px 0 0;display:flex;flex-direction:column;transform:translateY(105%);visibility:hidden;transition:transform .22s ease,visibility 0s linear .22s}
.reader-coach.is-open{transform:none;visibility:visible;transition:transform .22s ease}
.reader-coach .rc{padding:14px 16px calc(12px + env(safe-area-inset-bottom))}
.rc-close{display:inline-flex}
.rc-fab{position:fixed;right:max(14px,env(safe-area-inset-right));bottom:calc(14px + env(safe-area-inset-bottom));z-index:55;display:inline-flex;align-items:center;gap:8px;min-height:46px;padding:6px 16px 6px 7px;border:1px solid var(--gold);background:#16262f;color:var(--paper);font-size:14px;font-weight:700;border-radius:30px;box-shadow:0 6px 18px #0008}
.rc-fab-seal{flex:none;width:32px;height:32px;display:inline-grid;place-items:center;border:1px solid var(--gold);color:var(--gold);font:17px/1 var(--serif);border-radius:50%}
.rc-fab[aria-expanded=true]{visibility:hidden}
.rc-scrim{display:block;position:fixed;inset:0;z-index:59;background:#0a141acc}
.rc-scrim[hidden]{display:none}
html.rc-drawer-open{overflow:hidden}
.rc-log{min-height:80px}
.para-actions{scroll-margin-bottom:76px}
}
@media(max-width:999.98px) and (prefers-reduced-motion:reduce){.reader-coach,.reader-coach.is-open{transition:none}}