.library-shell{padding-bottom:40px}.page-top{padding:34px 0 22px}.page-top h1{font-size:32px;margin:0 0 12px}.page-top p{margin:0;color:#52666e;line-height:1.7}.article-card{min-height:200px;padding:22px}.article-card h3{font-size:23px}.card-cn{margin-bottom:20px}.footer{padding:24px 0;border-top:1px solid var(--line);color:#52666e;font-size:13px}.reading-layout{display:block;max-width:900px;margin:0 auto 40px}.bread{max-width:900px;margin:auto}.reader-intro{padding:28px 36px 20px}.reader-intro h1{margin:14px 0 10px}.reader-tools{padding:12px 20px}.reader-body{padding:28px 36px 36px}.tool-button,.tool-select,.menu-toggle{min-height:44px}.nav-links a{min-height:44px;display:flex;align-items:center}.countbar{color:#52666e}.tag{color:#176154}.focus-mode .reading-layout{max-width:900px}.focus-mode .reader-tools{top:0}@media(max-width:760px){.page-top{padding:24px 0 18px}.page-top h1{font-size:28px}.article-card{min-height:184px}.reader-intro{padding:24px 20px 16px}.reader-body{padding:24px 20px 30px}.reader-tools{padding:10px;position:static}.reader-feedback{padding:10px 20px}.reader-intro h1{font-size:29px;overflow-wrap:anywhere}.bread{font-size:14px}.footer{padding:20px 0}}
.footer{color:#d5e8e3}
.filters{grid-template-columns:1fr;gap:6px;padding:12px 16px}
.library-filter-options summary{min-height:44px;display:flex;align-items:center;cursor:pointer;color:#176154;font-size:14px}
.library-filter-options summary::before{content:'＋';margin-right:8px}.library-filter-options[open] summary::before{content:'−'}
.library-filter-fields{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;padding:4px 0 8px}
#reader-audio{width:calc(100% - 32px);margin:12px 16px}
@media(max-width:760px){
 .library-shell .page-top{padding:16px 0 12px}.library-shell .page-top h1{font-size:26px;margin:0 0 8px}
 .library-shell .page-top p{font-size:14px;line-height:1.6}
 .library-shell .filters{margin-bottom:10px;border-radius:14px}
 .library-shell .filters input,.library-shell .filters select{min-height:44px;padding:9px 12px;font-size:16px}
 .library-filter-fields{grid-template-columns:1fr 1fr}.library-filter-fields select:last-child{grid-column:1/-1}
 .library-shell .countbar{margin-bottom:12px}
 .library-shell .cards{gap:10px}
 .library-shell .article-card{min-height:0;padding:16px 18px;border-radius:14px}
 .library-shell .card-tags{margin-bottom:10px}.library-shell .article-card h3{font-size:22px;margin:0 0 5px}
 .library-shell .card-cn{margin:0;font-size:14px}.library-shell .card-footer{margin-top:12px;padding-top:10px}
}
.reader-tools{display:block;white-space:normal;overflow:visible}
.reader-primary{display:flex;gap:8px;flex-wrap:wrap}
.reader-options{margin-top:10px}
.reader-options summary{cursor:pointer;min-height:44px;display:flex;align-items:center;color:#176154;font-size:14px;font-weight:600}
.reader-options summary::before{content:'＋';margin-right:8px}.reader-options[open] summary::before{content:'−'}
.reader-settings{display:flex;flex-wrap:wrap;align-items:flex-end;gap:10px;padding:4px 0}
.reader-settings label{display:grid;gap:6px;font-size:13px;color:#52666e;min-width:0}
.reader-settings select{max-width:100%;width:100%}
.voice-help{flex-basis:100%;font-size:13px;line-height:1.7;color:#52666e;margin:2px 0 0;white-space:normal}
@media(max-width:760px){
 .reader-shell{width:calc(100% - 20px);padding:0 0 88px}
 .reader-intro{padding:20px 16px 12px}.reader-intro h1{font-size:26px;line-height:1.3}
 .reader-tools{padding:10px 12px;overflow:visible;white-space:normal}
 .reader-primary{position:fixed;bottom:0;left:0;right:0;z-index:35;display:grid;grid-template-columns:1.3fr .85fr 1fr;gap:8px;padding:10px 12px calc(10px + env(safe-area-inset-bottom,0px));background:#fff;box-shadow:0 -4px 20px #182a3310;border-top:1px solid #e0e8e7}
 .reader-primary .tool-button{padding:10px 5px;min-width:0;width:100%;font-size:14px}
 .reader-settings{display:grid;grid-template-columns:1fr 1fr;gap:10px}
 .reader-settings label:first-child,.voice-help{grid-column:1/-1}
 .reader-settings .tool-button{width:100%;min-width:0}
 .reader-settings .tool-select{font-size:16px;min-width:0}
 .reader-body{padding:18px 16px 28px;font-size:20px;line-height:1.9}
 .reader-body[data-size=large]{font-size:22px}.reader-body[data-size=largest]{font-size:24px}
 .reader-feedback{padding:10px 16px;font-size:13px;line-height:1.7}
 .reader-body .reading-paragraph{margin:0 0 1em}
 .word-sheet #word-sheet-close{min-width:44px;min-height:44px}
}

/* Preserve source bilingual paragraph breaks, including multi-paragraph translations. */
.zh-para{white-space:pre-line}
.grade-tabs{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin:22px 0 14px;max-width:600px}
.grade-tab{min-height:48px;border:1px solid #c7dcd6;border-radius:12px;padding:10px 8px;font:inherit;font-size:16px;font-weight:600;background:#fff;color:#176154;cursor:pointer;touch-action:manipulation}
.grade-tab[aria-pressed=true]{background:#176154;border-color:#176154;color:#fff}
.grade-tab:focus-visible{outline:3px solid #176154;outline-offset:3px}
.grade-tab:active{background:#e7f2ee;color:#176154}
@media(max-width:760px){.grade-tabs{margin-top:16px}.grade-tab{font-size:16px;padding:10px 4px}}