.tb-topbar{padding:19px 4vw;display:flex;align-items:center;justify-content:space-between;gap:22px;background:var(--card);border-bottom:1px solid var(--line);flex-wrap:wrap}.tb-brand{font:700 27px Georgia,serif;color:var(--accent);text-decoration:none;display:flex;align-items:center;gap:14px}.tb-brand span{font:600 15px system-ui;color:var(--ink)}.tb-topbar nav{display:flex;align-items:center;gap:15px;flex-wrap:wrap;font-size:13px}.tb-topbar form{margin:0}.tb-topbar a{color:var(--ink-2)}#tb-sync{font-size:12px;color:var(--muted)}#textbook-app{display:block;max-width:1500px;margin:0 auto;padding:32px 4vw 70px}.tb-intro{max-width:820px;margin:18px 0 32px}.tb-eyebrow{font-size:11px;letter-spacing:.15em;color:var(--accent)}.tb-intro h1,.tb-title h1{font-size:32px;line-height:1.5;margin:12px 0}.tb-intro p,.tb-note{font-size:14px;color:var(--ink-2);line-height:1.9}.tb-series{margin:36px 0}.tb-series h2{font-size:21px}.tb-books{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:17px}.tb-book{display:grid;grid-template-columns:66px 1fr;gap:16px;padding:20px;border:1px solid var(--line);border-radius:12px;background:var(--card);text-decoration:none;color:var(--ink)}.tb-book:hover{box-shadow:var(--sh-2);border-color:var(--accent)}.tb-book img{width:66px;height:96px;object-fit:cover;border:1px solid var(--line)}.tb-book h3{font-size:17px;margin:4px 0 9px}.tb-book p,.tb-small{font-size:12px;line-height:1.8;color:var(--muted)}.tb-badge{display:inline-block;font-size:11px;padding:3px 7px;color:var(--accent);background:var(--accent-wash);border-radius:5px}.tb-layout{display:grid;grid-template-columns:245px minmax(0,1fr);gap:27px}.tb-aside{min-width:0}.tb-aside>select,.tb-aside input{width:100%;margin:12px 0}.tb-lessons{max-height:72vh;overflow:auto}.tb-lessons a{display:block;padding:13px 11px;border-bottom:1px solid var(--line);text-decoration:none;color:var(--ink-2);font-size:13px;line-height:1.65}.tb-lessons a.active{background:var(--accent-wash);color:var(--accent);border-left:3px solid var(--accent)}.tb-lessons small{display:block;color:var(--muted);font-size:10px;margin-top:4px}.tb-stage{display:flex;gap:8px;flex-wrap:wrap;margin:22px 0}.tb-stage .active,.tb-actions .primary{background:var(--accent);color:white;border-color:var(--accent)}.tb-panel{padding:26px;background:var(--card);border:1px solid var(--line);border-radius:12px;margin-bottom:18px}.tb-panel h2{font-size:23px;line-height:1.6;margin:0 0 17px}.tb-note{padding:16px 19px;border-left:3px solid var(--accent);background:var(--accent-wash);margin:18px 0}.tb-actions,.tb-tools{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin:16px 0}.tb-actions a,.tb-tools a{font-size:12px;color:var(--accent)}.tb-actions button,.tb-tools button,.tb-stage button{min-height:34px}.tb-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}.tb-grid ul,.tb-panel ol{padding-left:23px;line-height:1.9}.tb-jp{font-family:"Yu Mincho","Noto Serif CJK JP","MS Mincho",serif;font-size:21px;line-height:2.15;letter-spacing:.025em;white-space:pre-wrap;overflow-wrap:anywhere;color:var(--ink)}.tb-paragraph{padding:20px 0;border-bottom:1px solid var(--line-2)}.tb-para-number{font-size:11px;color:var(--muted);margin:0 0 10px}.tb-zh{margin-top:18px;font-size:15px;line-height:1.95;color:var(--ink-2);white-space:pre-wrap;padding:17px;background:var(--card-2);border-left:2px solid var(--line)}.tb-word{font:inherit;color:inherit;border:0;border-radius:0;padding:0 1px;background:transparent;border-bottom:1px dotted var(--accent);cursor:pointer;line-height:inherit}.tb-draft-label{display:block;font-weight:600;margin:24px 0 10px}.tb-draft{width:100%;min-height:160px;font:15px/1.85 system-ui;resize:vertical;padding:15px;border:1px solid var(--line);border-radius:9px;background:var(--card-2);color:var(--ink)}.tb-note-input{width:100%;min-height:80px;font:13px/1.8 system-ui;padding:12px}.tb-hint{padding:16px 20px;margin:17px 0;border:1px solid var(--line);background:var(--card-2);border-radius:9px;line-height:1.9}.tb-hint summary{cursor:pointer;color:var(--accent);font-weight:600}.tb-hint .tb-jp{font-size:18px}.tb-hint p{margin:10px 0}.tb-hint code{color:var(--accent);background:var(--accent-wash);padding:2px 6px}.tb-source-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}.tb-source-text{white-space:pre-wrap;line-height:1.9;font-size:15px;overflow-wrap:anywhere;max-height:1000px;overflow:auto}.tb-source-grid img{width:100%;height:auto;border:1px solid var(--line)}.tb-source-grid.only-text,.tb-source-grid.only-scan{grid-template-columns:1fr}.tb-source-grid.only-text .tb-scan,.tb-source-grid.only-scan .tb-source-text{display:none}.tb-question{padding:18px 0;border-top:1px solid var(--line);line-height:1.9}.tb-options{display:grid;gap:9px}.tb-options button{text-align:left;padding:12px;white-space:normal}.tb-result{margin:13px 0;line-height:1.8}.tb-warning{padding:13px 17px;border:1px solid #f4d39c;background:#fff9eb;color:#735b2f;border-radius:7px;font-size:13px;line-height:1.8}.tb-empty{padding:20px;color:var(--muted);line-height:1.8}.tb-search-result{display:block;padding:13px;border-bottom:1px solid var(--line);color:var(--ink-2);text-decoration:none;line-height:1.8}.tb-loading{padding:50px;text-align:center;color:var(--muted)}#tb-notice{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:var(--ink);color:white;border-radius:9px;padding:13px 20px;z-index:20;max-width:90vw}#word-dialog{border:1px solid var(--line);border-radius:15px;padding:26px;max-width:560px;width:90vw;background:var(--card);color:var(--ink);box-shadow:var(--sh-pop)}#word-dialog::backdrop{background:rgba(25,30,50,.45)}.tb-modal-top{display:flex;justify-content:space-between;align-items:center;color:var(--muted);font-size:12px}.tb-word-facts{display:grid;grid-template-columns:80px 1fr;gap:13px;font-size:14px;line-height:1.8}.tb-word-facts dt{color:var(--muted)}.tb-word-facts dd{margin:0}a:focus-visible,button:focus-visible,textarea:focus-visible,select:focus-visible,input:focus-visible{outline:2px solid var(--accent);outline-offset:3px}@media(max-width:1000px){.tb-layout{grid-template-columns:190px minmax(0,1fr)}.tb-source-grid{grid-template-columns:1fr}.tb-jp{font-size:20px}.tb-topbar{gap:14px}.tb-topbar nav{gap:12px}}@media(max-width:700px){#textbook-app{padding:18px 18px 50px}.tb-layout,.tb-grid{grid-template-columns:1fr}.tb-lessons{max-height:230px;border:1px solid var(--line);border-radius:9px}.tb-title h1,.tb-intro h1{font-size:26px}.tb-panel{padding:19px}.tb-jp{font-size:19px;line-height:2}.tb-topbar{padding:15px 18px}.tb-topbar nav{font-size:12px}.tb-stage{gap:7px}.tb-stage button{padding:8px}.tb-books{grid-template-columns:1fr}.tb-intro{margin:12px 0 25px}}
body{padding-top:74px}.tb-topbar{position:fixed;inset:0 0 auto;z-index:50;padding:12px 3vw;min-height:74px;flex-wrap:nowrap;gap:18px}.tb-brand{white-space:nowrap;font-size:25px}.tb-brand span{font-size:14px}.tb-home-link{font-size:12px;white-space:nowrap;text-decoration:none}#tb-route-selectors{display:flex;align-items:center;gap:8px;min-width:0;flex:1}#tb-route-selectors select{min-width:50px;padding:9px;font:12px system-ui;max-width:100%}#tb-book-select{width:245px}#tb-lesson-select{width:260px}#tb-sync{white-space:nowrap;margin-left:auto;font-size:11px}.tb-account-menu{position:relative;white-space:nowrap;font-size:12px}.tb-account-menu>summary{cursor:pointer;padding:8px;border:1px solid var(--line);border-radius:7px}.tb-account-menu>nav{position:absolute;right:0;top:calc(100% + 12px);display:grid;gap:9px;width:235px;max-height:70vh;overflow:auto;padding:17px;border:1px solid var(--line);background:var(--card);border-radius:10px;box-shadow:var(--sh-pop)}.tb-account-menu button{width:100%;text-align:left}.tb-account-menu a{padding:7px;text-decoration:none}.tb-sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}.tb-aside>label,.tb-aside>#book-select{display:none}.tb-aside{position:sticky;top:95px;align-self:start;max-height:calc(100dvh - 110px);overflow:auto}.tb-lessons{max-height:none}.tb-location{display:flex;align-items:center;gap:16px;min-height:38px;padding-bottom:13px;border-bottom:1px solid var(--line);font-size:12px;color:var(--muted)}.tb-location>div{margin-left:auto;display:flex;gap:19px}.tb-location a{font-size:12px;text-decoration:none;color:var(--accent)}#tb-menu{display:none}.tb-stage{position:sticky;top:74px;z-index:25;background:var(--bg);padding:12px 0;margin-top:12px;border-bottom:1px solid var(--line)}.tb-stage button{font-size:13px;padding:9px 14px;white-space:nowrap}.tb-reference-source{font-size:11px;color:var(--muted)}#textbook-app{max-width:1460px}.tb-layout{grid-template-columns:245px minmax(0,1fr)}.tb-layout>article{min-width:0}.tb-published-reference .tb-zh{max-height:650px;overflow:auto}.tb-topbar [hidden]{display:none!important}@media(max-width:1100px){.tb-topbar{gap:12px;padding:12px 20px}#tb-sync{display:none}.tb-brand span{display:none}#tb-route-selectors{flex:1}.tb-layout{display:block}.tb-aside{display:none;position:fixed;top:74px;left:0;bottom:0;max-height:none;height:calc(100dvh - 74px);z-index:45;width:min(330px,85vw);padding:25px;background:var(--card);box-shadow:var(--sh-pop)}.tb-drawer-open .tb-aside{display:block}.tb-lessons{max-height:none;border:0}#tb-menu{display:inline-block;font-size:12px;padding:6px 9px}.tb-title h1{font-size:29px}.tb-stage{flex-wrap:nowrap;overflow-x:auto;scrollbar-width:thin}}@media(max-width:650px){.tb-topbar{gap:8px;padding:12px;min-height:70px}.tb-home-link{font-size:11px}.tb-brand{font-size:22px}#tb-route-selectors{gap:5px}#tb-route-selectors select{padding:8px 4px;font-size:11px}#tb-book-select{width:47%;min-width:55px}#tb-lesson-select{width:53%;min-width:45px}.tb-account-menu>summary{font-size:10px;padding:8px 5px}.tb-location{gap:10px}.tb-location>div{gap:13px}.tb-stage button{padding:9px 12px;font-size:12px}.tb-title h1{font-size:26px}.tb-para-number{line-height:1.6}.tb-jp{font-size:20px;line-height:2.05}}
#tb-close-drawer{display:none}.tb-location [hidden]{display:none!important}@media(max-width:1100px){#tb-close-drawer{display:block;width:100%;text-align:right;margin-bottom:18px;border-color:transparent;background:transparent;color:var(--accent)}}
#textbook-app button:not(.tb-word),.tb-topbar button,#word-dialog button{font:13px/1.5 "Segoe UI","Microsoft YaHei",sans-serif;color:var(--ink-2);border:1px solid var(--line);border-radius:8px;background:var(--card);padding:9px 13px;cursor:pointer;min-height:36px;transition:background .15s,border-color .15s}#textbook-app button:not(.tb-word):hover,.tb-topbar button:hover,#word-dialog button:hover{border-color:var(--accent);background:var(--accent-wash)}#textbook-app button:disabled{opacity:.45;cursor:default}#textbook-app .tb-stage .active,#textbook-app .tb-actions .primary{background:var(--accent);color:white;border-color:var(--accent)}#textbook-app select,#textbook-app input,#textbook-app textarea{box-sizing:border-box;font-family:"Segoe UI","Microsoft YaHei",sans-serif;color:var(--ink-2);border:1px solid var(--line);border-radius:8px;background:var(--card-2);padding:9px 11px}#textbook-app a{color:var(--accent);text-underline-offset:3px}#textbook-app .tb-book{color:var(--ink)}.tb-menu-short{display:none}#textbook-app button.tb-word{font:inherit;line-height:inherit;padding:0 1px;min-height:0;color:inherit;background:transparent;border:0;border-bottom:1px dotted #a4a5df;border-radius:0;box-shadow:none;cursor:pointer}#textbook-app button.tb-word:hover{background:var(--accent-wash);border-bottom-color:var(--accent)}.tb-hint{font-size:14px}.tb-title{margin-top:24px}.tb-stage{gap:7px}.tb-topbar .tb-brand{color:var(--accent)}.tb-location{scroll-margin-top:90px}#word-dialog{box-sizing:border-box}#word-dialog h2{margin:15px 0}.tb-account-menu nav a:hover{background:var(--accent-wash)}@media(max-width:650px){.tb-menu-long{display:none}.tb-menu-short{display:inline}.tb-account-menu>summary{font-size:12px;padding:8px}.tb-stage button{flex-shrink:0}.tb-topbar #tb-book-select{width:100px;flex-shrink:0}.tb-topbar #tb-lesson-select{width:100%;min-width:60px}.tb-topbar #tb-route-selectors{min-width:0;flex:1}.tb-brand{font-size:20px}.tb-location>div a{font-size:11px}}
@media(max-width:650px){#textbook-app #prev-paragraph,#textbook-app #next-paragraph{padding:8px;font-size:11px}#textbook-app #paragraph-select{padding:8px 5px;font-size:11px}.tb-tools:has(#paragraph-select){gap:6px;flex-wrap:nowrap}.tb-tools:has(#paragraph-select) label{font-size:10px}}
#tb-route-selectors select{border:1px solid var(--line);border-radius:8px;background:var(--card-2);color:var(--ink-2)}
.tb-resume{display:inline-block;padding:12px 18px;border-radius:8px;background:var(--accent);color:white!important;text-decoration:none;margin-top:8px;font-size:13px}
.tb-reading-paper{padding:30px clamp(18px,4vw,58px)}.tb-reading-heading{max-width:50rem;margin:18px auto 10px;border-bottom:0}.tb-reading-heading h2{font-family:"Yu Mincho","Noto Serif CJK JP",serif;font-size:29px;line-height:1.8;margin:4px 0 8px}.tb-reading-paper>.tb-tools{font-size:12px;border-bottom:1px solid var(--line);padding-bottom:18px}.tb-reading-archive{max-width:50rem;margin:24px auto 0;padding:15px 0;border-top:1px solid var(--line);font-size:12px;color:var(--muted)}.tb-reading-archive>summary{cursor:pointer}.tb-reading-archive .tb-jp{font-size:17px}.tb-reading-paper #tb-supplement{max-width:50rem;margin:auto}@media(max-width:700px){.tb-reading-paper{padding:20px 16px}.tb-reading-heading h2{font-size:25px}}
.tb-reading-mode .tb-title h1,.tb-reading-mode .tb-title>.tb-small{display:none}.tb-reading-mode .tb-stage{margin:14px 0}.tb-reading-mode .tb-title .tb-eyebrow{margin:12px 0 4px}

.tb-account-menu nav .tb-small{white-space:normal;overflow-wrap:anywhere;line-height:1.8;margin:6px 0}
.tb-vocabulary progress{width:100%;height:12px;accent-color:var(--accent,#527460)}
.tb-vocab-card{margin:24px 0;padding:24px;border:1px solid #d7ddd5;border-radius:12px;background:#fcfdf9}
.tb-vocab-prompt{font-size:clamp(1.8rem,5vw,2.8rem);overflow-wrap:anywhere;margin:.5em 0}
.tb-vocab-options{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:16px 0}
.tb-vocab-options button{display:flex;gap:12px;text-align:left;align-items:flex-start;white-space:normal;overflow-wrap:anywhere;padding:16px;min-height:64px;line-height:1.7}
.tb-vocab-options button span{font-weight:bold;flex:0 0 1em}
.tb-vocab-options button.correct{border:2px solid #39784d;background:#eaf5eb;color:#20452c;opacity:1}
.tb-vocab-options button.incorrect{border:2px solid #b94b3f;background:#fff0eb;color:#7b2c24;opacity:1}
.tb-vocab-reading{margin:8px 0}.tb-vocab-table{overflow:auto;margin-top:16px}
.tb-vocab-table table{border-collapse:collapse;width:100%;min-width:600px;text-align:left}
.tb-vocab-table th,.tb-vocab-table td{padding:12px 8px;border-bottom:1px solid #d7ddd5;vertical-align:top}
.tb-vocab-table small{display:block}.tb-vocab-word{text-align:left;white-space:normal}
.tb-vocab-all{margin-top:24px}.tb-vocab-table td:nth-child(2){min-width:130px}.tb-vocab-table td:nth-child(4){white-space:nowrap}
@media(max-width:650px){.tb-vocab-options{grid-template-columns:1fr}.tb-vocab-card{padding:16px}.tb-vocab-options button{padding:12px}}
/* Long source titles must not widen the mobile reading page. */
.tb-tools #article-select{min-width:0;max-width:100%;flex:1 1 16rem;text-overflow:ellipsis}
.tb-novel-books{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}.tb-novel-book{grid-template-columns:96px minmax(0,1fr);align-items:center;min-height:185px}.tb-novel-book img.tb-novel-cover{width:96px;height:142px;object-fit:contain;border:0;border-radius:2px;filter:drop-shadow(2px 4px 5px #24203425)}.tb-novel-book.is-preparing:hover{box-shadow:none;border-color:var(--line)}.tb-novel-book.is-preparing .tb-badge{color:var(--muted);background:var(--card-2)}@media(max-width:700px){.tb-novel-books{grid-template-columns:1fr}.tb-novel-book{grid-template-columns:82px minmax(0,1fr);gap:15px;padding:18px}.tb-novel-book img.tb-novel-cover{width:82px;height:124px}}

/* A lesson's grammar is a single continuous reading page. */
.tb-grammar-paper{font-size:15px;line-height:1.95}.tb-grammar-paper>header,.tb-grammar-section,.tb-grammar-original{max-width:49rem;margin-left:auto;margin-right:auto}.tb-grammar-section{padding:24px 0;border-top:1px solid var(--line);margin-top:26px}.tb-grammar-section h3{font-size:20px;line-height:1.65}.tb-grammar-source-text{white-space:pre-wrap;overflow-wrap:anywhere;line-height:2.05;color:var(--ink-2)}.tb-grammar-point{padding:14px 0}.tb-grammar-point+.tb-grammar-point{border-top:1px solid var(--line-2)}.tb-grammar-point h4{font-size:17px;line-height:1.8;margin:6px 0}.tb-grammar-point p{margin:10px 0}.tb-grammar-point .tb-jp{font-size:19px}.tb-grammar-original{margin-top:28px;border-top:1px solid var(--line);padding-top:20px}@media(max-width:700px){.tb-grammar-paper{padding:22px 16px;font-size:15px}.tb-grammar-section{padding:18px 0}.tb-grammar-point .tb-jp{font-size:18px}}

.tb-grammar-scan{margin:22px 0}.tb-grammar-scan img{display:block;width:100%;height:auto;border:1px solid var(--line)}.tb-grammar-scan figcaption{font-size:12px;color:var(--muted);line-height:1.8;margin-top:8px}