.learning-reader { --surface: var(--bg-card); --background: var(--bg-secondary); --border: var(--border-color); --primary-color: var(--focus-accent); }
body.learning-reader.toc-open { padding-right: 0; }
.learning-reader .study-container { display: block; margin-top: 0; padding: calc(var(--nav-h, 80px) + 38px) 24px 90px; }
.learning-reader .study-container > .container { display: block; max-width: 800px; padding: 0; margin: 0 auto; text-align: left; }
.learning-reader .lesson-article, .learning-reader .lesson-container, .learning-reader .lesson-content-box { max-width: 100%; padding: 0; margin-inline: 0; background: transparent; border: 0; box-shadow: none; }
.reader-breadcrumb { display: flex; align-items: baseline; flex-wrap: wrap; gap: 10px; margin-bottom: 30px; font-size: .85rem; color: var(--text-secondary); }
.reader-breadcrumb a { color: inherit; text-decoration: none; }
.reader-breadcrumb a:hover { text-decoration: underline; }
.learning-reader h1.lesson-header { font-size: clamp(2rem, 4vw, 3rem) !important; letter-spacing: -.04em; line-height: 1.16; }
.learning-reader p.lesson-description { font-size: 1.08rem !important; line-height: 1.7 !important; }
.reader-facts { display: flex; flex-wrap: wrap; gap: 8px 20px; color: var(--text-secondary); font-size: .78rem; margin: 20px 0; }
.reader-tools { display: flex; flex-wrap: wrap; align-items: center; gap: 24px; margin: 22px 0 10px; }
.reader-tools a { color: var(--focus-accent); font-size: .88rem; text-underline-offset: 4px; }
.reader-tools .reader-start { background: var(--focus-accent); color: var(--bg-primary); border-radius: 8px; padding: 12px 18px; text-decoration: none; font-weight: 600; }
.reader-save-note { min-height: 1.3em; font-size: .78rem; color: var(--text-secondary); margin-bottom: 8px; }
.learning-reader .lesson-meta-generated { font-size: .75rem !important; opacity: .85; }
.learning-reader .lesson-content-box { border-top: 1px solid var(--border-color); padding-top: 24px; scroll-margin-top: 110px; }
.learning-reader .lesson-markdown-content { font-size: 1.04rem; line-height: 1.85; overflow-wrap: break-word; }
.learning-reader .lesson-markdown-content > *:not(.lesson-flashcard-set) { max-width: 100%; }
.learning-reader .lesson-markdown-content :is(h1,h2,h3,h4) { color: var(--text-primary); border: 0; padding-left: 0; scroll-margin-top: 110px; letter-spacing: -.02em; }
.learning-reader .lesson-markdown-content h2 { font-size: 1.65rem; margin-top: 3.5rem; padding-bottom: 12px; border-bottom: 1px solid var(--border-color); }
.learning-reader .lesson-markdown-content h3 { font-size: 1.3rem; margin-top: 2.5rem; }
.learning-reader .lesson-markdown-content h4 { font-size: 1.1rem; margin-top: 1.8rem; }
.learning-reader .lesson-markdown-content strong { color: inherit; background: none; padding: 0; box-shadow: none; border: 0; }
.learning-reader .lesson-markdown-content a, .learning-reader .lesson-markdown-content a:visited { color: var(--focus-accent); }
.learning-reader .lesson-markdown-content blockquote { border-color: var(--focus-accent); background: var(--bg-secondary); color: var(--text-primary); box-shadow: none; }
.learning-reader .lesson-markdown-content blockquote p:first-child::first-line { color: inherit; }
.learning-reader .lesson-markdown-content pre { background: #17241f; border: 1px solid #334b3d; border-radius: 12px; padding: 20px; text-shadow: none; max-width: 100%; overflow-x: auto; }
.learning-reader .lesson-markdown-content pre code { white-space: pre; overflow-wrap: normal; }
.learning-reader .lesson-markdown-content table { font-size: .9rem; }
.learning-reader .lesson-markdown-content th { background: var(--bg-secondary); color: var(--text-primary); }
.learning-reader .lesson-markdown-content td, .learning-reader .lesson-markdown-content th { border-color: var(--border-color); }
.learning-reader .lesson-footer { scroll-margin-top: 110px; }
.learning-reader .complete-button { background: var(--focus-accent); color: var(--bg-primary); border: 0; box-shadow: none; border-radius: 10px; }
.reader-finish { margin: 24px 0; padding: 20px; border: 1px solid var(--border-color); border-radius: 12px; }
.reader-finish button { border: 0; background: transparent; color: var(--focus-accent); font: inherit; font-weight: 600; cursor: pointer; padding: 8px 0; }
.reader-finish p { color: var(--text-secondary); font-size: .85rem; line-height: 1.6; }
.learning-reader nav.reader-lesson-nav { position: static; display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 16px; background: transparent; border: 0; box-shadow: none; padding: 0; }
.reader-lesson-nav a { padding: 18px; color: var(--text-primary); border: 1px solid var(--border-color); border-radius: 12px; text-decoration: none; }
.reader-lesson-nav a:hover { border-color: var(--focus-accent); }
.reader-lesson-nav small { display: block; color: var(--text-secondary); margin-bottom: 8px; }
.reader-lesson-nav span { font-size: .9rem; line-height: 1.5; }
.learning-reader .lesson-page-toc-panel { background: var(--bg-primary); border-color: var(--border-color); }
.learning-reader .lesson-page-toc-header { display: flex; }
.learning-reader .lesson-page-toc-panel:not(.open) { visibility: hidden; }
.learning-reader .lesson-page-toc-panel nav { position: static; background: transparent; box-shadow: none; padding: 0; }
.learning-reader .lesson-page-toc-list a { color: var(--text-secondary); }
.learning-reader .lesson-page-toc-list a.active { color: var(--focus-accent); background: var(--bg-secondary); border-color: var(--focus-accent); }
.learning-reader .lesson-page-toc-progress-fill { background: var(--focus-accent); }
.learning-reader .lesson-page-toc-toggle, .learning-reader .teacher-chat-btn { background: var(--bg-card); color: var(--focus-accent); border: 1px solid var(--border-color); box-shadow: 0 3px 12px #0000000a; }
.learning-reader .teacher-chat-btn:hover, .learning-reader .lesson-page-toc-toggle:hover { background: var(--bg-secondary); color: var(--focus-accent); box-shadow: none; }
.learning-reader .teacher-chat-btn { right: 16px; bottom: 20px; writing-mode: horizontal-tb; flex-direction: row; min-height: 44px; border-radius: 24px; padding: 10px 16px; font-size: .8rem; }
.learning-reader .teacher-chat-btn__label { writing-mode: horizontal-tb; font-size: .8rem; }
.learning-reader :focus-visible { outline: 3px solid var(--focus-accent); outline-offset: 4px; }
@media(min-width:1200px) {
 .learning-reader.toc-open .study-container > .container { margin-left: max(0px, calc((100vw - 1160px) / 2)); margin-right: 300px; max-width: min(800px, calc(100vw - 380px)); }
 .learning-reader .lesson-page-toc-panel { width: 270px; top: var(--nav-h, 80px); padding-bottom: 80px; }
 .learning-reader .lesson-page-toc-toggle { height: 90px; width: 36px; }
}
@media(max-width:1199px) and (min-width:769px) { .learning-reader .lesson-page-toc-panel { box-shadow: -10px 0 30px #0002; } }
@media(max-width:768px) {
 .learning-reader .study-container { padding-inline: 20px !important; }
 .learning-reader .study-container > .container { padding-inline: 0 !important; }
 .learning-reader .lesson-markdown-content { font-size: 1rem; }
 .learning-reader .lesson-page-toc-toggle { width: 44px; height: 44px; bottom: 80px; right: 16px; }
 .learning-reader nav.reader-lesson-nav { grid-template-columns: 1fr; }
 .learning-reader .teacher-chat-btn__label { display: inline; }
 .learning-reader .lesson-page-toc-panel { z-index: 1200; padding-bottom: env(safe-area-inset-bottom, 0px); }
}
@media(prefers-reduced-motion:reduce) { .learning-reader *, .learning-reader *::before { scroll-behavior: auto !important; transition: none !important; } }

.guest-practice { margin: 0 0 2rem; padding: 1.5rem; border: 1px solid var(--focus-accent); border-radius: 18px; background: var(--bg-card); }
.guest-practice h2 { margin-top: 0; font-size: 1.5rem; }
.guest-practice h3 { margin-top: 1.5rem; }
.guest-practice .sample-text { white-space: pre-wrap; overflow-wrap: anywhere; line-height: 1.65; }
.sample-options { display: grid; gap: .65rem; }
.sample-button { padding: .85rem 1rem; margin: .3rem .3rem .3rem 0; border: 1px solid var(--border-color); border-radius: 10px; background: var(--bg-secondary); color: var(--text-primary); text-align: left; font: inherit; cursor: pointer; min-height: 44px; }
.sample-button:hover:not(:disabled), .sample-button:focus-visible { border-color: var(--focus-accent); }
.sample-button:disabled { opacity: .65; cursor: default; }
.sample-feedback { border-left: 3px solid var(--focus-accent); padding: 1rem; margin-block: 1rem; background: var(--bg-secondary); }
.sample-reread { display: block; margin-top: 1rem; color: var(--focus-accent); }
@media(max-width:600px) { .guest-practice { padding: 1rem; } }
.lesson-footer:has(.guest-practice) > .practice-box { display: none !important; }
.learning-reader .guest-practice .reader-start, .learning-reader .lesson-footer a.reader-start { display: inline-block; background: var(--focus-accent); color: var(--bg-primary); border: 0; border-radius: 10px; padding: 12px 18px; font: inherit; font-weight: 600; text-decoration: none; cursor: pointer; }
.guest-practice pre { background: #17241f; color: #f2f2e9; border: 1px solid #334b3d; border-radius: 10px; padding: 14px; overflow-x: auto; white-space: pre; }
.guest-practice pre code { white-space: pre; overflow-wrap: normal; font-size: .85rem; }