:root{--black:#000000;--ink:#f4f7ff;color-scheme:dark;font-family:Arial,Helvetica,sans-serif;background:var(--black);color:var(--ink);font-synthesis:none}*{box-sizing:border-box}body{margin:0;background:var(--black);color:var(--ink);font-size:16px}button,input,textarea,select{font:inherit;background:var(--black);color:var(--ink);border:1px solid var(--ink);border-radius:0}button{padding:10px 15px;cursor:pointer;line-height:1.2}button:hover{text-decoration:underline;text-underline-offset:5px}button:disabled{cursor:default;border-style:dotted;text-decoration:none}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:2px solid var(--ink);outline-offset:4px}input,textarea,select{padding:12px;max-width:100%}textarea{resize:vertical}input::placeholder,textarea::placeholder{color:var(--ink)}a{color:var(--ink)}[hidden]{display:none!important}h1,h2,h3,p{margin-top:0}h2{font-size:16px;font-weight:500}h3{font-size:17px}p{line-height:1.6}header{height:86px;padding:0 36px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--ink);gap:20px}.brand{text-decoration:none;letter-spacing:.18em;font-weight:700;font-size:20px;white-space:nowrap}.brand span{font-weight:400}.header-right{display:flex;gap:22px;align-items:center}.owner{font-size:14px}.quiet{border:0;padding:8px 0}.shell{display:grid;grid-template-columns:240px minmax(0,1fr);min-height:calc(100vh - 127px)}.library{border-right:1px solid var(--ink);padding:29px 22px;display:flex;flex-direction:column;gap:25px}.section-heading{display:flex;justify-content:space-between;align-items:center}.section-heading h2{margin:0}.icon-button{font-size:23px;padding:1px 8px}.library-bottom{margin-top:auto;padding-top:40px;font-size:14px}.library-bottom button{width:100%}.book-card{display:block;width:100%;text-align:left;border:0;border-bottom:1px solid var(--ink);padding:19px 0}.book-card[aria-current=true]{border-left:3px solid var(--ink);padding-left:12px}.book-card strong{font-family:Georgia,serif;font-size:21px;font-weight:400;display:block;overflow-wrap:anywhere;line-height:1.3;margin-bottom:10px}.book-card span{display:block;font-size:13px;line-height:1.5}main{min-width:0;padding:34px 36px 50px}.eyebrow{font-size:12px;font-weight:600;letter-spacing:.17em;line-height:1.5;margin-bottom:14px}.empty{max-width:740px;padding:8vh 3vw}.empty h1,.login h1{font:400 clamp(44px,5vw,76px)/1.06 Georgia,serif;letter-spacing:-.035em;margin-bottom:28px}.empty>p:not(.eyebrow):not(.meta){max-width:480px;font-size:18px}.empty button{margin:14px 0 20px;padding:16px 24px}.meta{font-size:13px;line-height:1.5}.book-heading{display:flex;justify-content:space-between;gap:24px;align-items:center;margin-bottom:24px}.book-heading h1{font:400 36px/1.15 Georgia,serif;margin:0;overflow-wrap:anywhere}.study-control{display:flex;align-items:center;gap:14px;font-size:13px;flex-wrap:wrap;justify-content:flex-end}.study-control button{font-size:13px}.book-progress{height:4px;border-top:1px solid var(--ink);margin-bottom:18px}.book-progress>div{height:3px;background:var(--ink);width:0}.reading-toolbar{display:flex;align-items:center;gap:14px;justify-content:space-between;margin-bottom:25px;flex-wrap:wrap;font-size:13px}.page-nav{display:flex;gap:10px;align-items:center}.page-nav button{padding:2px 10px;font-size:26px}.page-nav select{padding:7px;max-width:100px}.reading-toolbar>button{font-size:13px}.reading-grid{display:grid;grid-template-columns:minmax(230px,.9fr) minmax(340px,1.1fr);gap:32px}.panel-heading{display:flex;justify-content:space-between;align-items:center;gap:12px;min-height:51px;border-top:1px solid var(--ink);border-bottom:1px solid var(--ink);margin-bottom:22px}.panel-heading h2{margin:0;white-space:nowrap}.source-panel,.teaching-panel{min-width:0}.tabs{display:flex;gap:13px}.tabs button{padding:16px 0;border:0;font-size:14px}.tabs button[aria-selected=true]{text-decoration:underline;text-underline-offset:8px}.source-lines{font:18px/1.8 Georgia,serif;max-height:72vh;overflow:auto;padding-right:14px;scrollbar-color:var(--ink) var(--black)}.source-line{display:grid;grid-template-columns:30px minmax(0,1fr);gap:10px;margin:0 0 8px;padding:4px 0;border-left:2px solid var(--black)}.source-line.active{border-color:var(--ink)}.line-number{font:12px/2.5 Arial,sans-serif;padding-left:5px}.line-text{white-space:pre-wrap;overflow-wrap:anywhere;tab-size:4}.voice-bar{display:flex;gap:8px;flex-wrap:wrap;align-items:center}.voice-bar button,.voice-bar select{font-size:13px;padding:9px 10px}#voice-status{margin:10px 0}.lessons{max-height:54vh;overflow:auto;padding-right:12px}.lesson-item{border-bottom:1px solid var(--ink);padding:18px 0}.lesson-item>button{border:0;padding:0;font-size:12px;letter-spacing:.08em;margin-bottom:10px}.lesson-item p{font-size:16px;white-space:pre-wrap;overflow-wrap:anywhere;margin-bottom:0}.lesson-item.speaking{border-left:3px solid var(--ink);padding-left:12px}.notice{border:1px dashed var(--ink);padding:12px;font-size:13px;line-height:1.5;margin-bottom:16px;white-space:pre-wrap}.conversation{max-height:40vh;overflow:auto}.chat{margin:25px 0;border-left:1px solid var(--ink);padding-left:16px;white-space:pre-wrap;overflow-wrap:anywhere}.chat h3{font-size:13px;letter-spacing:.08em}.chat p{font-size:16px}.chat button{font-size:13px}.ask-form{margin-top:24px}.quick-actions{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:12px}.quick-actions button{font-size:12px;padding:8px}.ask-input{display:flex;border:1px solid var(--ink);align-items:flex-end}.ask-input textarea{width:100%;border:0;min-height:90px;font-size:16px}.ask-input button{white-space:nowrap;border:0;font-size:14px;padding:16px 12px}.canvas-toolbar{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:12px}.canvas-toolbar button{font-size:12px;padding:8px}.canvas-toolbar button[aria-pressed=true]{text-decoration:underline;text-underline-offset:4px}.board-wrap{border:1px solid var(--ink);overflow:auto;max-height:60vh;background:var(--black)}#board{display:block;width:100%;min-width:520px;touch-action:none;user-select:none;background:var(--black)}#board text{fill:var(--ink);font:17px Arial,sans-serif}#board .node{cursor:grab}#board .edge-label{font-size:14px}.slide-stage{border:1px solid var(--ink);aspect-ratio:4/3;padding:38px;display:flex;flex-direction:column;justify-content:center;background:var(--black);overflow:auto}.slide-stage h2{font:32px/1.2 Georgia,serif}.slide-stage p{white-space:pre-wrap;font-size:18px}.slide-stage:fullscreen{padding:10vw;font-size:28px}.slide-stage:fullscreen h2{font-size:56px}.slide-nav{display:flex;gap:8px;margin-top:12px;align-items:center;flex-wrap:wrap}.slide-nav button{font-size:12px}.slide-nav span{font-size:13px}footer{height:41px;border-top:1px solid var(--ink);display:flex;justify-content:space-between;align-items:center;padding:0 36px;font-size:11px;letter-spacing:.1em}dialog{background:var(--black);color:var(--ink);border:1px solid var(--ink);padding:30px;width:min(520px,calc(100vw - 32px));max-height:90vh}dialog::backdrop{background:var(--black)}.dialog-heading{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px;gap:20px}.dialog-heading h2{font:28px Georgia,serif;margin:0}.dialog-heading button{border:0;font-size:24px;padding:0 6px}dialog label{display:block;margin:20px 0 9px;font-size:14px}dialog input,dialog select,dialog textarea{width:100%;margin-bottom:18px}dialog p{font-size:14px}dialog form>button{width:100%}.memory-row{border-bottom:1px solid var(--ink);padding:12px 0;display:flex;align-items:flex-start;gap:12px}.memory-row p{flex:1;white-space:pre-wrap;overflow-wrap:anywhere}.memory-row button{font-size:12px}.login{min-height:100vh;display:grid;place-items:center;padding:32px}.login-inner{width:min(460px,100%)}.book-symbol{border:1px solid var(--ink);width:48px;height:58px;display:grid;place-items:center;font:32px Georgia,serif;margin-bottom:32px}.login label{display:block;font-size:13px;margin:25px 0 10px}.login input,.login form>button{display:block;width:100%;margin-bottom:16px}.login form>button{padding:15px}#login-error{font-size:14px}#toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);background:var(--black);color:var(--ink);border:1px solid var(--ink);padding:15px 24px;max-width:90vw;z-index:10}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}@media(min-width:1700px){main{padding:40px 65px}.reading-grid{gap:60px}.source-lines{font-size:21px}}@media(max-width:1100px){.shell{grid-template-columns:190px minmax(0,1fr)}.library{padding:25px 15px}main{padding:28px 22px}.reading-grid{gap:22px;grid-template-columns:minmax(200px,.85fr) minmax(280px,1.15fr)}.panel-heading{flex-wrap:wrap}.tabs{gap:11px}.header-right{gap:16px}.owner{display:none}}@media(max-width:800px){header{padding:0 20px;height:74px}.shell{display:block}.library{border-right:0;border-bottom:1px solid var(--ink);padding:18px 20px;gap:10px}.section-heading{gap:20px}.library-bottom{display:none}#book-list{display:flex;gap:20px;overflow:auto}.book-card{width:190px;min-width:170px;border-bottom:0;padding:10px 0}.book-card strong{font-size:18px}.book-card span{font-size:12px}main{padding:25px 20px}.book-heading h1{font-size:29px}.reading-grid{grid-template-columns:minmax(0,1fr);gap:24px}.source-lines{max-height:35vh}.lessons{max-height:60vh}.empty{padding:50px 0}.empty h1{font-size:48px}.study-control{max-width:130px}.book-heading{align-items:flex-start}.header-right{gap:16px;font-size:13px}.brand{font-size:16px}.tabs button{font-size:14px}.panel-heading{flex-wrap:nowrap}.reading-toolbar{font-size:12px}.slide-stage{padding:25px}footer{padding:0 20px;font-size:10px}}@media(prefers-reduced-motion:no-preference){dialog[open]{animation:appear .15s ease-out}@keyframes appear{from{transform:translateY(8px)}to{transform:translateY(0)}}}

#original-page{background:#000000;color:#f4f7ff}#page-image-wrap{overflow:auto;max-height:75vh;margin:14px 0;border:1px solid #f4f7ff}#page-image{display:block;width:100%;height:auto;max-width:none}#page-image-wrap.zoomed #page-image{width:180%;min-width:1000px}#ocr-details{margin-top:18px}#ocr-details summary{cursor:pointer;padding:12px 0;color:#f4f7ff}#page-image-status{font-size:13px} @media(max-width:800px){#page-image-wrap{max-height:65vh}}
/* Simple reader v3 */
#workspace>header{height:58px;padding:0 16px;position:sticky;top:0;z-index:5;background:#000000;gap:12px}#workspace>header button{border:0;padding:12px;min-height:44px}.reader-brand{font-size:12px;letter-spacing:.15em}.shell{display:block;min-height:calc(100dvh - 58px)}main{padding:28px 20px 110px;max-width:1100px;margin:0 auto}.book-heading{display:block;margin:0 0 18px}.book-heading h1{font:400 17px/1.4 Georgia,serif;text-align:center;max-width:850px;margin:auto}.reading-grid{display:block}.source-panel{width:100%}.source-panel>.panel-heading{display:none}#original-page{width:100%}#page-image-wrap{max-height:none;border:0;margin:0;overflow:auto}#page-image{width:100%;height:auto}#page-image-wrap.zoomed #page-image{width:160%;min-width:1000px}#page-image-status:empty{display:none}#page-image-status{margin:12px 0}.source-lines{max-height:none;padding:12px;font-size:20px;line-height:1.9}.reader-dock{position:fixed;z-index:6;bottom:0;left:0;right:0;display:flex;align-items:center;justify-content:center;gap:16px;padding:12px 16px calc(12px + env(safe-area-inset-bottom));margin:0;background:#000000;border-top:1px solid #f4f7ff}.page-nav{gap:8px;align-items:center}.page-nav button{min-width:44px;min-height:44px;padding:0;font-size:26px;border:0}.page-nav select{padding:8px 4px;min-height:44px;font-size:15px;width:64px}.page-nav label{display:none}#page-total{font-size:12px;white-space:nowrap}.ask-bhai-button{min-height:44px;padding:10px 20px;font-weight:600}#page-zoom{min-height:44px;border:0;font-size:13px;padding:8px}.reading #ocr-details{margin:24px 0 0;font-size:13px}.reading #ocr-details>summary{font-size:12px}.empty{padding:10vh 0;max-width:640px;margin:auto}.empty h1{font-size:clamp(44px,7vw,74px)}
dialog{padding:24px;border:1px solid #f4f7ff;max-height:90dvh;overflow:auto;background:#000000;color:#f4f7ff}dialog::backdrop{background:rgba(0,0,0,.85)}.sheet-heading{display:flex;justify-content:space-between;align-items:center;gap:16px;margin:0 0 20px;position:sticky;top:-24px;background:#000000;z-index:3;padding:12px 0;border-bottom:1px solid #f4f7ff}.sheet-heading h2{font:26px Georgia,serif;margin:0}.sheet-heading button{min-height:44px;border:0}.option-row{margin:18px 0}#reader-options .study-control{max-width:none;justify-content:flex-start;gap:16px}#reader-options>button{margin:12px 18px 0 0}#reader-options #coverage{font-size:14px}#library-dialog{width:min(700px,calc(100vw - 24px))}#library-dialog .library{border:0;padding:0;gap:18px}#library-dialog #book-list{display:block;max-height:none}#library-dialog .book-card{width:100%;min-width:0;padding:22px 4px;border-bottom:1px solid #f4f7ff}#library-dialog .book-card strong{font-size:23px}#library-dialog .library-bottom{display:none}#bhai-dialog{width:min(900px,calc(100vw - 24px));max-height:90dvh}#bhai-dialog .teaching-panel{width:100%}#bhai-dialog .panel-heading{border-top:0;margin-bottom:14px;min-height:0}#bhai-dialog .tabs{gap:24px}#bhai-dialog .tabs button{min-height:44px;padding:10px 0}#bhai-dialog .voice-bar{gap:8px}.prepared-lesson{margin:20px 0}.prepared-lesson>summary,.teaching-tools>summary{padding:14px 0;cursor:pointer;font-size:15px}.lessons,.conversation{max-height:none;overflow:visible;padding:0}.lesson-item p{font-size:17px;line-height:1.8}.chat p{line-height:1.8}.ask-form{margin:20px 0 0}.ask-input textarea{min-height:80px;font-size:16px}.teaching-tools{margin-bottom:12px}.quick-actions{padding:8px 0}.quick-actions button{min-height:44px;font-size:14px}.board-wrap{max-height:65dvh}.canvas-toolbar button{min-height:44px}.slide-stage{min-height:320px}.voice-bar button{min-height:44px}.reading #book-error{margin:15px 0}.reading .book-progress{display:none}#toast{z-index:100;bottom:100px}#bhai-dialog #ask-status{min-height:1.5em}#bhai-dialog .sheet-heading{margin-bottom:12px}
@media(max-width:600px){main{padding:14px 8px 100px}.book-heading{margin-bottom:12px}.book-heading h1{font-size:14px;padding:0 14px}.reader-dock{gap:6px;padding:8px 8px calc(8px + env(safe-area-inset-bottom));justify-content:space-between}.page-nav{gap:1px}.page-nav button{min-width:36px}.page-nav select{width:54px}.ask-bhai-button{padding:10px 12px;font-size:14px}#page-zoom{padding:8px 4px;font-size:12px}#page-total{font-size:11px}#bhai-dialog{width:100%;max-width:100%;height:92dvh;max-height:92dvh;margin:auto 0 0;padding:16px;border-left:0;border-right:0;border-bottom:0}.sheet-heading{top:-16px}.sheet-heading h2{font-size:24px}.empty{padding:9vh 18px}.source-lines{font-size:18px}.slide-stage{padding:20px}.slide-stage h2{font-size:26px}#original-page #page-image-wrap{max-height:none}.ask-input{display:block}.ask-input button{width:100%;border-top:1px solid #f4f7ff;min-height:44px}.reading-grid{display:block}}

.diagram-explanation{white-space:pre-wrap;line-height:1.8;font-size:17px}#listen-diagram{margin-bottom:20px;min-height:44px}#bhai-dialog #toast{position:sticky;bottom:0;left:auto;transform:none;max-width:100%;margin-top:16px}#bhai-dialog #board{min-width:650px}
/* Canvas uses the full WKWebView viewport, without the iOS Fullscreen API. */
#bhai-dialog.canvas-full{position:fixed;inset:0;margin:0!important;width:100vw!important;max-width:100vw!important;height:100dvh!important;max-height:100dvh!important;padding:0!important;border:0;overflow:hidden;box-sizing:border-box}
#bhai-dialog.canvas-full>.sheet-heading,#bhai-dialog.canvas-full>#bhai-page-label,#bhai-dialog.canvas-full .teaching-panel>.panel-heading,#bhai-dialog.canvas-full .ask-form{display:none}
#bhai-dialog.canvas-full .teaching-panel{height:100%;min-height:0}
#bhai-dialog.canvas-full #canvas-view{height:100%;min-height:0;display:flex;flex-direction:column;padding:10px 10px calc(8px + env(safe-area-inset-bottom));box-sizing:border-box;gap:6px}
.canvas-screen-heading{display:none}#bhai-dialog.canvas-full .canvas-screen-heading{display:flex;align-items:center;justify-content:space-between;gap:8px;flex-shrink:0}.canvas-screen-heading button{min-height:44px;border:0;padding:8px;font-size:14px}.canvas-screen-heading span{font-size:14px}
#bhai-dialog.canvas-full #diagram-explanation,#bhai-dialog.canvas-full #listen-diagram{display:none}
#bhai-dialog.canvas-full .canvas-toolbar{margin:0;gap:5px;flex-shrink:0}.canvas-toolbar button{font-size:12px;padding:8px;min-height:40px}#bhai-dialog.canvas-full #canvas-view>p.meta{font-size:11px;line-height:1.4;margin:0;flex-shrink:0}
#bhai-dialog.canvas-full .board-wrap{flex:1;min-height:0;width:100%;max-height:none;overflow:hidden;margin:0;border:1px solid #f4f7ff;touch-action:none}
#bhai-dialog.canvas-full #board{display:block!important;width:100%!important;height:100%!important;min-width:0!important;max-width:none;touch-action:none;overscroll-behavior:none;user-select:none;-webkit-user-select:none}
#bhai-dialog.canvas-full #canvas-status{font-size:11px;margin:0;min-height:16px;flex-shrink:0}

/* Teacher controls stay beside the book; the original page retains its width. */
.reader-dock{flex-wrap:wrap;gap:8px}.reader-dock>button{min-height:44px;font-size:14px;padding:8px 12px}
.teacher-strip{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin:0 0 14px;padding:10px 0;border-bottom:1px solid #f4f7ff;background:#000000;color:#f4f7ff}
#teacher-status{flex:1 1 220px;font-size:13px;line-height:1.5}.teacher-strip button{min-height:44px;font-size:13px}
#auto-teach{width:auto;margin:0 8px 0 0;accent-color:#f4f7ff}#question-page{margin:0 0 10px;padding:10px}
#bhai-dialog .tabs{position:sticky;top:0;background:#000000;gap:24px}#resume-lesson{min-height:44px}
@media(max-width:600px){.reader-dock{justify-content:center;gap:4px}.reader-dock .page-nav{flex-basis:100%;justify-content:center}.reader-dock>button{flex:1}.reading main{padding-bottom:155px}.teacher-strip{margin:0 8px 12px}.teacher-strip button{flex:1}.teacher-strip #teacher-status{flex-basis:100%}.canvas-screen-heading button{font-size:13px;padding:8px 4px}}

/* Hide book zoom button on phones; retain native pinch zoom. */
@media(max-width:600px){#page-zoom{display:none!important}}

/* Compact fixed reading dock v8 */
.reader-dock{
  position:fixed;bottom:0;left:0;right:0;
  display:flex;flex-wrap:nowrap;gap:8px;
  padding:8px 12px calc(8px + env(safe-area-inset-bottom));
  background:#000000;color:#f4f7ff;
}
.reader-dock #open-bhai,.reader-dock #open-canvas{
  flex:1;min-width:0;max-width:360px;min-height:44px;
  margin:0;padding:10px 12px;
}
#reader>.page-nav{
  display:flex;justify-content:center;flex-wrap:wrap;
  gap:8px;margin:8px 0 14px;
}
.reading main{
  padding-bottom:calc(88px + env(safe-area-inset-bottom));
}
@media(max-width:600px){
  .reader-dock{justify-content:center}
  .reader-dock #page-zoom{display:none!important}
  #reader>.page-nav{gap:6px}
}

/* Readable teaching text v10 */
.teaching-text{white-space:normal;overflow-wrap:anywhere;font-size:17px;line-height:1.75}
.teaching-text p{white-space:pre-wrap;margin:0 0 1em!important;font-size:inherit!important;line-height:inherit!important}
.teaching-text strong{font-weight:700}
.teaching-text h4{font-size:1.08em;line-height:1.5;margin:1.3em 0 .6em}
.teaching-text ul,.teaching-text ol{white-space:normal;padding-left:1.5em;margin:.5em 0 1em}
.teaching-text li{margin:.45em 0;white-space:pre-wrap}
.teaching-text pre{white-space:pre;overflow:auto;border:1px solid #f4f7ff;background:#000000;color:#f4f7ff;padding:14px;font-size:14px;line-height:1.6;max-width:100%}
.teaching-text code{font-family:ui-monospace,Menlo,monospace;color:#f4f7ff;background:#000000}
.chat{white-space:normal}.chat>h3{margin:1.2em 0 .6em}

/* Spoken question controls v12 */
.question-voice-tools{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0;background:#000000;color:#f4f7ff}
.question-voice-tools button{min-height:44px;padding:10px 12px;font-size:14px}
.question-voice-tools p{flex-basis:100%;margin:4px 0;line-height:1.5}

/* Canvas clarity v16 */
#bhai-dialog.canvas-full .diagram-guide{flex-shrink:0;border-bottom:1px solid #f4f7ff;background:#000000;color:#f4f7ff;padding:4px 0}
.diagram-guide summary{cursor:pointer;min-height:40px;padding:10px 4px;font-size:15px}
#diagram-guide-body{max-height:25dvh;overflow:auto;padding:0 8px;line-height:1.6;font-size:16px}
#diagram-guide-body p{margin:8px 0 14px}
.diagram-guide button{min-height:44px;margin:4px;font-size:14px}