@import url("https://fonts.googleapis.com/css2?family=Source+Serif+4:ital,opsz,wght@0,8..60,400;0,8..60,600;0,8..60,700;1,8..60,400&family=DM+Sans:ital,wght@0,400;0,500;0,600;0,700;1,400&display=swap");:root{--reader-bg:#f8fafc;--reader-card:#fff;--reader-accent:#0f6e56;--reader-accent-light:#e1f5ee;--reader-accent-mid:#1abeac;--reader-text:#0f172a;--reader-text-secondary:#475569;--reader-text-tertiary:#94a3b8;--reader-border:#e2e8f0;--reader-serif:"Source Serif 4",Georgia,serif;--reader-sans:"DM Sans",system-ui,sans-serif;--content-font-size:15.5px;--reader-gold:#d97706;--reader-gold-light:#fef3c7;--reader-coral:#ef4444;--reader-coral-light:#fee2e2;--reader-blue:#3b82f6;--reader-blue-light:#eff6ff;--reader-purple:#7c3aed;--reader-purple-light:#ede9fe;--reader-green:#10b981;--reader-green-light:#d1fae5;--reader-nav-width:240px;--reader-sidebar-width:270px}.reader-root{font-family:var(--reader-sans);color:var(--reader-text);background:var(--reader-bg);height:100vh;overflow:hidden}.reader-nav{width:var(--reader-nav-width);min-width:var(--reader-nav-width);background:var(--reader-card);border-right:1px solid var(--reader-border);display:flex;flex-direction:column;overflow:hidden}.reader-nav-header{padding:14px 14px 12px;border-bottom:1px solid var(--reader-border)}.reader-nav-brand{display:flex;align-items:center;gap:8px;margin-bottom:12px}.reader-nav-icon{width:26px;height:26px;border-radius:6px;background:var(--reader-accent);display:flex;align-items:center;justify-content:center;flex-shrink:0}.reader-nav-title{font-size:13px;font-weight:600;letter-spacing:-.3px}.reader-nav-meta-label{font-size:11px;text-transform:uppercase;letter-spacing:1px;color:var(--reader-text-tertiary);margin-bottom:2px}.reader-nav-meta-value{font-size:13px;font-weight:500;color:var(--reader-text-secondary)}.reader-nav-sections{flex:1;overflow-y:auto;padding:6px 0}.reader-nav-sections::-webkit-scrollbar{width:2px}.reader-nav-sections::-webkit-scrollbar-thumb{background:var(--reader-border);border-radius:2px}.reader-nav-item{padding:7px 14px;font-size:12px;color:var(--reader-text-secondary);cursor:pointer;display:flex;align-items:center;gap:6px;transition:all .15s;line-height:1.35;border-left:2px solid transparent}.reader-nav-item:hover{color:var(--reader-text);background:var(--reader-accent-light)}.reader-nav-item.active{color:var(--reader-accent);font-weight:500;border-left-color:var(--reader-accent);background:var(--reader-accent-light)}.reader-nav-num{font-size:11px;color:var(--reader-text-tertiary);min-width:14px;font-variant-numeric:tabular-nums}.reader-nav-check{width:14px;height:14px;border-radius:50%;border:1.5px solid var(--reader-border);margin-left:auto;flex-shrink:0;display:flex;align-items:center;justify-content:center;transition:all .3s}.reader-nav-check.done{background:var(--reader-accent);border-color:var(--reader-accent)}.reader-nav-check.done:after{content:"";display:block;width:4px;height:2.5px;border-left:1.5px solid #fff;border-bottom:1.5px solid #fff;transform:rotate(-45deg) translateY(-.5px)}.reader-nav-progress{padding:10px 14px;border-top:1px solid var(--reader-border)}.reader-progress-bar{height:3px;background:var(--reader-border);border-radius:3px;overflow:hidden;margin-bottom:4px}.reader-progress-fill{height:100%;background:var(--reader-accent);border-radius:3px;transition:width .5s cubic-bezier(.4,0,.2,1)}.reader-progress-text{font-size:11px;color:var(--reader-text-tertiary)}.reader-content-scroll{flex:1;overflow-y:auto;overflow-x:hidden;scroll-behavior:smooth}.reader-content-scroll::-webkit-scrollbar{width:4px}.reader-content-scroll::-webkit-scrollbar-thumb{background:var(--reader-border);border-radius:4px}.reader-content-inner{max-width:860px;margin:0 auto;padding:40px 48px 120px;box-sizing:border-box;width:100%}.reader-eyebrow{font-size:12px;text-transform:uppercase;letter-spacing:1.5px;color:var(--reader-accent);margin-bottom:8px;font-weight:500}.reader-h1{font-size:30px;font-weight:700;line-height:1.2;letter-spacing:-.3px;margin-bottom:12px}.reader-h1,.reader-subtitle{font-family:var(--reader-serif)}.reader-subtitle{font-size:var(--content-font-size);line-height:1.75;color:var(--reader-text-secondary);margin-bottom:24px;font-weight:400;font-style:italic}.reader-divider{width:45px;height:2px;background:var(--reader-accent);margin-bottom:32px;border-radius:2px}.reader-section{margin-bottom:40px;scroll-margin-top:60px}.reader-section-heading{font-family:var(--reader-serif);font-size:22px;font-weight:600;letter-spacing:-.2px;margin-bottom:16px;margin-top:8px;line-height:1.3}.reader-credit-heading{display:flex;align-items:center;gap:10px;margin-bottom:6px}.reader-credit-heading:before{content:"";display:inline-block;width:3px;min-width:3px;height:22px;background:var(--reader-accent);border-radius:2px}.reader-section-rule{height:1px;background:var(--reader-border);margin:0 0 18px}.reader-section-subtitle{font-size:11px;color:var(--reader-accent);margin-bottom:14px;font-weight:500}.reader-section p{font-family:var(--reader-serif);font-size:var(--content-font-size);line-height:1.85;color:var(--reader-text)}.reader-section div>p,.reader-section p,.reader-section>div>p{margin-bottom:24px}.reader-section>div+div,.reader-section>div>div+div{margin-top:8px}.glossary-term{font-weight:600;color:var(--reader-accent);border-bottom:1.5px dashed var(--reader-accent);cursor:pointer;border-radius:2px;transition:background .15s}.glossary-term:hover{background:var(--reader-accent-light)}.glossary-tooltip{position:fixed;z-index:900;background:var(--reader-card);border:1px solid var(--reader-border);border-top:3px solid var(--reader-accent);border-radius:10px;padding:12px 15px;max-width:290px;box-shadow:0 8px 24px rgba(0,0,0,.12);pointer-events:none;animation:tooltipIn .12s ease}.glossary-tooltip-term{font-size:13px;font-weight:700;color:var(--reader-text);margin-bottom:2px;font-family:var(--reader-serif)}.glossary-tooltip-phonetic{font-size:11px;color:var(--reader-accent);font-family:var(--reader-sans);margin-bottom:7px;font-style:italic}.glossary-tooltip-def{font-size:12px;line-height:1.55;color:var(--reader-text-secondary);font-family:var(--reader-sans)}@keyframes tooltipIn{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}.reader-lab-banner{margin:36px 0 0;padding:18px 20px;background:linear-gradient(135deg,var(--reader-accent-light),#d4f0e6);border:1.5px solid var(--reader-accent);border-radius:12px;display:flex;align-items:center;gap:16px}.reader-lab-banner-icon{width:44px;height:44px;border-radius:10px;background:var(--reader-accent);display:flex;align-items:center;justify-content:center;flex-shrink:0}.reader-lab-banner-body{flex:1;min-width:0}.reader-lab-banner-title{font-size:13px;font-weight:700;color:var(--reader-accent);margin-bottom:2px;font-family:var(--reader-sans)}.reader-lab-banner-sub{font-size:12px;color:var(--reader-text-secondary);font-family:var(--reader-sans);line-height:1.45}.reader-lab-banner-btn{display:inline-flex;align-items:center;gap:5px;padding:9px 16px;background:var(--reader-accent);color:#fff;border-radius:8px;font-size:12px;font-weight:600;text-decoration:none;font-family:var(--reader-sans);white-space:nowrap;flex-shrink:0;transition:opacity .15s}.reader-lab-banner-btn:hover{opacity:.85}.reader-bookmark-banner{display:flex;align-items:center;gap:10px;padding:10px 14px;background:var(--reader-accent-light);border:1px solid var(--reader-accent);border-radius:8px;margin-bottom:24px;font-family:var(--reader-sans);font-size:12.5px;color:var(--reader-text-secondary)}.reader-bookmark-resume{padding:5px 12px;background:var(--reader-accent);color:#fff;border:none;border-radius:6px;font-size:12px;font-weight:600;cursor:pointer;font-family:var(--reader-sans);white-space:nowrap;transition:opacity .15s}.reader-bookmark-resume:hover{opacity:.85}.reader-bookmark-dismiss{padding:4px 8px;background:transparent;border:none;color:var(--reader-text-tertiary);cursor:pointer;font-size:14px;margin-left:auto;flex-shrink:0}.reader-fontsize-controls{display:flex;align-items:center;gap:3px;margin-left:auto;flex-shrink:0}.reader-fontsize-btn{width:28px;height:28px;border-radius:5px;border:1px solid var(--reader-border);background:var(--reader-card);cursor:pointer;display:flex;align-items:center;justify-content:center;font-family:var(--reader-sans);font-size:11px;font-weight:700;color:var(--reader-text-secondary);transition:all .15s;line-height:1;padding:0}.reader-fontsize-btn:hover{border-color:var(--reader-accent);color:var(--reader-accent);background:var(--reader-accent-light)}.reader-ask-ai-btn{display:inline-flex;align-items:center;gap:5px;margin-top:16px;padding:6px 13px;border-radius:20px;border:1.5px solid var(--reader-accent);background:transparent;color:var(--reader-accent);font-size:11.5px;font-weight:600;font-family:var(--reader-sans);cursor:pointer;transition:all .15s}.reader-ask-ai-btn:hover{background:var(--reader-accent-light)}.reader-section ol,.reader-section ul{font-family:var(--reader-sans);font-size:16px;line-height:1.8;margin:12px 0 20px;padding-left:28px}.reader-section ol li,.reader-section ul li{margin-bottom:8px;padding-left:4px}.reader-section ul{list-style:disc}.reader-section table{width:100%;border-collapse:collapse;font-family:var(--reader-sans);font-size:14px;margin:16px 0 20px}.reader-section table th{text-align:left;padding:10px 12px;background:var(--reader-bg);border-bottom:2px solid var(--reader-border);font-weight:600;font-size:13px;color:var(--reader-accent)}.reader-section table td{padding:9px 12px;border-bottom:1px solid var(--reader-border);line-height:1.55}.reader-section h3{font-family:var(--reader-sans);font-size:18px;font-weight:600;margin:28px 0 12px;letter-spacing:-.2px;color:var(--reader-text)}.reader-term{font-weight:600;color:var(--reader-accent);cursor:help;border-bottom:1px dashed var(--reader-accent-mid);transition:all .15s}.reader-term:hover{background:var(--reader-accent-light);padding:0 2px;border-radius:2px}.reader-callout{padding:14px 18px;border-radius:0 8px 8px 0;margin:24px 0}.reader-callout-label{font-size:11px;text-transform:uppercase;letter-spacing:1px;font-weight:700;margin-bottom:6px}.reader-callout p{font-size:15px;line-height:1.75;margin:0;font-family:var(--reader-sans)}.reader-callout.key-concept{background:var(--reader-accent-light);border-left:3px solid var(--reader-accent)}.reader-callout.key-concept .reader-callout-label{color:var(--reader-accent)}.reader-callout.exam-tip{background:var(--reader-gold-light);border-left:3px solid var(--reader-gold)}.reader-callout.exam-tip .reader-callout-label{color:var(--reader-gold)}.reader-callout.clinical-pearl{background:var(--reader-purple-light);border-left:3px solid var(--reader-purple)}.reader-callout.clinical-pearl .reader-callout-label{color:var(--reader-purple)}.reader-callout.warning{background:var(--reader-coral-light);border-left:3px solid var(--reader-coral)}.reader-callout.warning .reader-callout-label{color:var(--reader-coral)}.reader-objectives{background:var(--reader-blue-light);border-radius:10px;padding:14px 16px;margin-bottom:32px}.reader-objectives-title{font-size:11px;font-weight:600;color:var(--reader-blue);text-transform:uppercase;letter-spacing:.8px;margin-bottom:10px}.reader-objectives-item{font-size:13px;color:var(--reader-text);line-height:1.5;padding:3px 0 3px 16px;position:relative}.reader-objectives-item:before{content:"";position:absolute;left:0;top:9px;width:6px;height:6px;border-radius:50%;background:var(--reader-blue)}.reader-confidence{background:var(--reader-bg);border:1px solid var(--reader-border);border-radius:8px;padding:12px;margin:18px 0;text-align:center}.reader-confidence p{font-size:12px;color:var(--reader-text-secondary);margin-bottom:8px;font-family:var(--reader-sans)!important;line-height:1.3!important}.reader-confidence-dots{display:flex;gap:5px;justify-content:center}.reader-confidence-dot{width:32px;height:32px;border-radius:50%;border:1.5px solid var(--reader-border);background:var(--reader-card);cursor:pointer;font-size:12px;font-weight:500;color:var(--reader-text-secondary);display:flex;align-items:center;justify-content:center;transition:all .2s}.reader-confidence-dot:hover{border-color:var(--reader-accent);color:var(--reader-accent);background:var(--reader-accent-light);transform:scale(1.1)}.reader-confidence-dot.selected{background:var(--reader-accent);color:#fff;border-color:var(--reader-accent);transform:scale(1.1)}.reader-worked{background:var(--reader-bg);border:1px solid var(--reader-border);border-radius:10px;padding:14px 16px;margin:18px 0}.reader-worked-label{font-size:11px;font-weight:600;color:var(--reader-purple);text-transform:uppercase;letter-spacing:.8px;margin-bottom:8px}.reader-worked-question{font-size:13px;font-weight:500;line-height:1.5;margin-bottom:8px}.reader-worked-step{font-size:12px;line-height:1.6;color:var(--reader-text-secondary);padding-left:20px;margin-bottom:4px;position:relative}.reader-worked-step:before{content:attr(data-step);position:absolute;left:0;font-weight:600;color:var(--reader-accent);font-size:11px}.reader-worked-answer{font-size:13px;font-weight:600;color:var(--reader-accent);margin-top:8px}.reader-tag{display:inline-block;font-size:11px;padding:1px 6px;border-radius:3px;font-weight:500;margin-left:5px;vertical-align:middle}.reader-tag.high-yield{background:var(--reader-coral-light);color:var(--reader-coral)}.reader-tag.research{background:var(--reader-purple-light);color:var(--reader-purple)}.reader-tag.nursing{background:var(--reader-blue-light);color:var(--reader-blue)}.reader-tag.advanced{background:var(--reader-gold-light);color:var(--reader-gold)}.reader-figure{margin:20px 0;text-align:center}.reader-figure svg{max-width:100%}.reader-figure-caption{font-size:11px;color:var(--reader-text-tertiary);margin-top:6px;font-style:italic}.reader-topbar{height:44px;min-height:44px;background:var(--reader-card);border-bottom:1px solid var(--reader-border);display:flex;align-items:center;justify-content:space-between;padding:0 20px}.reader-topbar-left{display:flex;align-items:center;gap:8px}.reader-topbar-badge{font-size:11px;background:var(--reader-accent-light);color:var(--reader-accent);padding:2px 8px;border-radius:99px;font-weight:500}.reader-topbar-title{font-size:12px;color:var(--reader-text-secondary)}.reader-topbar-btn{width:30px;height:30px;border-radius:6px;border:none;background:transparent;cursor:pointer;display:flex;align-items:center;justify-content:center;color:var(--reader-text-secondary);transition:all .15s}.reader-topbar-btn:hover{background:var(--reader-accent-light);color:var(--reader-accent)}.reader-topbar-btn.active{background:var(--reader-accent);color:#fff}.reader-sidebar{width:var(--reader-sidebar-width);min-width:var(--reader-sidebar-width);background:var(--reader-card);border-left:1px solid var(--reader-border);display:flex;flex-direction:column;overflow:hidden;transition:all .3s cubic-bezier(.4,0,.2,1)}.reader-sidebar.collapsed{width:0;min-width:0;border:none;overflow:hidden}.reader-sidebar-header{padding:10px 12px;border-bottom:1px solid var(--reader-border);display:flex;align-items:center;gap:6px}.reader-sidebar-icon{width:20px;height:20px;border-radius:5px;background:var(--reader-accent);display:flex;align-items:center;justify-content:center}.reader-sidebar-title{font-size:13px;font-weight:600}.reader-sidebar-badge{font-size:11px;background:var(--reader-purple-light);color:var(--reader-purple);padding:2px 7px;border-radius:99px;font-weight:500;margin-left:auto}.reader-sidebar-tabs{display:flex;gap:1px;padding:5px 6px;background:var(--reader-bg)}.reader-sidebar-tab{flex:1;padding:7px 0;border:none;background:transparent;font-size:11px;font-weight:500;color:var(--reader-text-tertiary);cursor:pointer;border-radius:4px;transition:all .15s;text-align:center;font-family:var(--reader-sans)}.reader-sidebar-tab:hover{color:var(--reader-text-secondary)}.reader-sidebar-tab.active{background:var(--reader-card);color:var(--reader-accent);box-shadow:0 1px 2px rgba(0,0,0,.04)}.reader-sidebar-body{flex:1;overflow-y:auto;padding:10px}.reader-sidebar-body::-webkit-scrollbar{width:2px}.reader-sidebar-body::-webkit-scrollbar-thumb{background:var(--reader-border);border-radius:2px}.reader-insight{background:var(--reader-purple-light);border-radius:7px;padding:8px 10px;margin-bottom:10px;display:flex;align-items:center;gap:7px}.reader-insight-icon{width:22px;height:22px;border-radius:5px;background:var(--reader-purple);display:flex;align-items:center;justify-content:center;flex-shrink:0}.reader-insight-text{font-size:11px;color:var(--reader-purple);line-height:1.4;font-weight:500}.reader-term-card{background:var(--reader-bg);border-radius:7px;padding:8px 10px;margin-bottom:6px;cursor:pointer;transition:all .15s;display:flex;align-items:flex-start;gap:8px}.reader-term-card:hover{background:var(--reader-accent-light);transform:translateX(1px)}.reader-term-status{width:7px;height:7px;border-radius:50%;border:1.5px solid var(--reader-border);margin-top:4px;flex-shrink:0;transition:all .3s}.reader-term-status.mastered{background:var(--reader-accent);border-color:var(--reader-accent)}.reader-term-status.weak{background:var(--reader-coral);border-color:var(--reader-coral)}.reader-term-word{font-size:13px;font-weight:600;margin-bottom:2px}.reader-term-def{font-size:12px;color:var(--reader-text-secondary);line-height:1.45}.reader-quiz-card{background:var(--reader-bg);border-radius:7px;padding:12px;margin-bottom:8px}.reader-quiz-difficulty{font-size:11px;color:var(--reader-text-tertiary);margin-bottom:4px;text-transform:capitalize}.reader-quiz-question{font-size:13px;font-weight:500;line-height:1.5;margin-bottom:10px}.reader-quiz-option{display:block;width:100%;padding:8px 10px;border:1px solid var(--reader-border);border-radius:5px;background:var(--reader-card);font-size:12px;cursor:pointer;transition:all .15s;text-align:left;margin-bottom:4px;font-family:var(--reader-sans);line-height:1.4}.reader-quiz-option:hover{border-color:var(--reader-accent-mid);background:var(--reader-accent-light)}.reader-quiz-option.correct{border-color:var(--reader-accent);background:var(--reader-accent-light);color:var(--reader-accent);font-weight:500}.reader-quiz-option.wrong{border-color:var(--reader-coral);background:var(--reader-coral-light);color:var(--reader-coral)}.reader-quiz-option.disabled{pointer-events:none;opacity:.5}.reader-quiz-explanation{font-size:11px;color:var(--reader-text-secondary);line-height:1.5;margin-top:7px;padding:7px 9px;background:var(--reader-accent-light);border-radius:4px}.reader-flashcard{perspective:800px;height:140px;margin-bottom:8px;cursor:pointer}.reader-flashcard-inner{position:relative;width:100%;height:100%;transition:transform .5s cubic-bezier(.4,0,.2,1);transform-style:preserve-3d}.reader-flashcard.flipped .reader-flashcard-inner{transform:rotateY(180deg)}.reader-flashcard-face{position:absolute;inset:0;backface-visibility:hidden;border-radius:9px;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:14px;text-align:center}.reader-flashcard-front{background:linear-gradient(135deg,var(--reader-accent) 0,#0f766e 100%);color:#fff}.reader-flashcard-front .label{font-size:11px;text-transform:uppercase;letter-spacing:1px;opacity:.7;margin-bottom:4px}.reader-flashcard-front .term{font-size:14px;font-weight:600;font-family:var(--reader-sans)}.reader-flashcard-back{background:var(--reader-card);border:1px solid var(--reader-border);transform:rotateY(180deg)}.reader-flashcard-back span{font-size:12px;line-height:1.45;color:var(--reader-text-secondary)}.reader-stats-grid{display:grid;grid-template-columns:1fr 1fr;gap:6px;margin-bottom:10px}.reader-stat-card{background:var(--reader-bg);border-radius:7px;padding:8px 10px;text-align:center}.reader-stat-value{font-size:18px;font-weight:600}.reader-stat-label{font-size:11px;color:var(--reader-text-tertiary);margin-top:1px}.reader-sidebar-btn{flex:1;padding:7px;border:1px solid var(--reader-border);border-radius:5px;background:var(--reader-card);font-size:11px;font-weight:500;cursor:pointer;color:var(--reader-text-secondary);transition:all .15s;font-family:var(--reader-sans)}.reader-sidebar-btn:hover{border-color:var(--reader-accent);color:var(--reader-accent)}.reader-sidebar-btn.primary{background:var(--reader-accent);color:#fff;border-color:var(--reader-accent)}.reader-sidebar-btn.know{background:var(--reader-green-light);color:var(--reader-green);border-color:var(--reader-green)}.reader-sidebar-btn.dont-know{background:var(--reader-coral-light);color:var(--reader-coral);border-color:var(--reader-coral)}.reader-ai-messages{flex:1;overflow-y:auto;padding:4px 0}.reader-ai-msg{margin-bottom:8px;display:flex;gap:6px;align-items:flex-start}.reader-ai-avatar{width:28px;height:28px;border-radius:50%;overflow:hidden;border:1.5px solid var(--reader-accent);flex-shrink:0;margin-top:1px;animation:reader-av-breathe 4s ease-in-out infinite}.reader-ai-avatar img{width:100%;height:100%;-o-object-fit:cover;object-fit:cover;-o-object-position:center top;object-position:center top;display:block}.reader-ai-avatar.thinking{animation:reader-av-think .5s ease-in-out infinite alternate}@keyframes reader-av-breathe{0%,to{transform:scale(1) translateY(0)}50%{transform:scale(1.04) translateY(-1px)}}@keyframes reader-av-think{0%{transform:scale(1) rotate(-1deg)}to{transform:scale(1.04) rotate(1deg)}}.reader-ai-bubble{font-size:12px;line-height:1.55;color:var(--reader-text-secondary);background:var(--reader-bg);padding:7px 10px;border-radius:7px;max-width:100%}.reader-ai-bubble.user{background:var(--reader-accent);color:#fff}.reader-ai-input-row{display:flex;gap:4px;margin-top:6px}.reader-ai-input{flex:1;padding:7px 10px;border:1px solid var(--reader-border);border-radius:7px;font-size:12px;font-family:var(--reader-sans);background:var(--reader-bg);color:var(--reader-text);outline:none}.reader-ai-input:focus{border-color:var(--reader-accent)}.reader-ai-send{width:28px;height:28px;border-radius:7px;border:none;background:var(--reader-accent);color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;flex-shrink:0}@supports (-webkit-touch-callout:none){.reader-root{height:-webkit-fill-available}}.reader-bottom-bar,.reader-hamburger,.reader-nav-drawer,.reader-nav-overlay,.reader-sheet{display:none}@media (max-width:768px){.reader-root{height:100svh}.reader-nav{display:none}.reader-sidebar{display:none!important}.reader-content-inner{max-width:100%;padding:24px 20px 120px}.reader-h1{font-size:24px}.reader-section-heading{font-size:18px}.reader-topbar{padding:0 14px;position:relative}.reader-topbar-title{font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:55vw}.reader-section table{font-size:12px}.reader-hamburger{display:flex!important}.reader-sidebar-toggle{display:none}.reader-nav-overlay{display:block;position:fixed;inset:0;background:rgba(0,0,0,.45);z-index:200;opacity:0;pointer-events:none;transition:opacity .25s}.reader-nav-overlay.open{opacity:1;pointer-events:all}.reader-nav-drawer{position:fixed;top:0;left:0;bottom:0;width:280px;max-width:85vw;background:var(--reader-card);z-index:201;display:flex;flex-direction:column;transform:translateX(-100%);transition:transform .25s cubic-bezier(.4,0,.2,1);box-shadow:4px 0 24px rgba(0,0,0,.12)}.reader-nav-drawer.open{transform:translateX(0)}.reader-nav-drawer .reader-nav-header{padding:20px 16px 14px}.reader-nav-drawer .reader-nav-sections{flex:1;overflow-y:auto;-webkit-overflow-scrolling:touch}.reader-nav-drawer .reader-nav-item{padding:11px 16px;font-size:13px;min-height:44px}.reader-nav-drawer .reader-nav-progress{padding:12px 16px;border-top:1px solid var(--reader-border)}.reader-bottom-bar{display:flex;position:fixed;bottom:0;left:0;right:0;height:60px;background:var(--reader-card);border-top:1px solid var(--reader-border);z-index:100;padding-bottom:env(safe-area-inset-bottom)}.reader-bottom-tab{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;border:none;background:transparent;cursor:pointer;color:var(--reader-text-tertiary);font-family:var(--reader-sans);font-size:10px;font-weight:500;transition:color .15s;-webkit-tap-highlight-color:transparent;min-height:44px}.reader-bottom-tab.active{color:var(--reader-accent)}.reader-bottom-tab svg{width:20px;height:20px}.reader-sheet{display:block;position:fixed;bottom:0;left:0;right:0;background:var(--reader-card);border-radius:16px 16px 0 0;box-shadow:0 -4px 32px rgba(0,0,0,.12);z-index:150;transform:translateY(100%);transition:transform .3s cubic-bezier(.4,0,.2,1);max-height:75svh;display:flex;flex-direction:column}.reader-sheet.open{transform:translateY(0)}.reader-sheet-handle{width:36px;height:4px;background:var(--reader-border);border-radius:2px;margin:10px auto 0;flex-shrink:0}.reader-sheet-header{display:flex;align-items:center;justify-content:space-between;padding:10px 16px 8px;border-bottom:1px solid var(--reader-border);flex-shrink:0}.reader-sheet-title{font-size:13px;font-weight:600}.reader-sheet-close{width:28px;height:28px;border-radius:50%;border:none;background:var(--reader-bg);display:flex;align-items:center;justify-content:center;cursor:pointer;color:var(--reader-text-secondary)}.reader-sheet-body{flex:1;overflow-y:auto;-webkit-overflow-scrolling:touch;padding:12px 16px calc(16px + env(safe-area-inset-bottom))}.reader-quiz-option{padding:12px 14px;font-size:13px;min-height:44px}.reader-flashcard{height:180px}.reader-sidebar-btn{padding:10px;font-size:13px;min-height:44px}.reader-callout{padding:12px 14px}.reader-objectives-item{font-size:13px;padding:4px 0 4px 18px}}