:root{--color-bg-primary: #0a0d12;--color-bg-secondary: #12161d;--color-bg-tertiary: #1a2029;--color-bg-card: #141820;--color-bg-hover: #1e2532;--color-text-primary: #f0f2f4;--color-text-secondary: #a0a8b2;--color-text-muted: #8b929e;--color-accent-primary: #60a5fa;--color-accent-secondary: #818cf8;--color-accent-success: #34d399;--color-accent-warning: #fbbf24;--color-accent-danger: #f87171;--color-neuro: #8b5cf6;--color-chest: #3b82f6;--color-msk: #10b981;--color-gi: #f59e0b;--color-gu: #ec4899;--color-peds: #06b6d4;--color-ir: #ef4444;--color-breast: #f472b6;--color-cardiac: #dc2626;--color-nuclear: #84cc16;--space-xs: .25rem;--space-sm: .5rem;--space-md: 1rem;--space-lg: 1.5rem;--space-xl: 2rem;--space-2xl: 3rem;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 20px;--radius-xl: 24px;--radius-full: 9999px;--glass-bg: rgba(20, 24, 32, .75);--glass-bg-light: rgba(30, 37, 50, .6);--glass-border: rgba(255, 255, 255, .08);--glass-blur: blur(16px);--glass-blur-light: blur(8px);--shadow-sm: 0 2px 8px rgba(0, 0, 0, .25);--shadow-md: 0 4px 16px rgba(0, 0, 0, .35);--shadow-lg: 0 8px 32px rgba(0, 0, 0, .45);--shadow-xl: 0 16px 48px rgba(0, 0, 0, .5);--shadow-glow: 0 0 24px rgba(96, 165, 250, .15);--shadow-glow-strong: 0 0 40px rgba(96, 165, 250, .25);--shadow-inner: inset 0 1px 0 rgba(255, 255, 255, .05);--transition-fast: .15s cubic-bezier(.4, 0, .2, 1);--transition-normal: .25s cubic-bezier(.4, 0, .2, 1);--transition-slow: .4s cubic-bezier(.4, 0, .2, 1);--font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-mono: "JetBrains Mono", "Fira Code", monospace;--font-reading: "Sarabun", "Inter", sans-serif}[data-theme=light]{--color-bg-primary: #f8fafc;--color-bg-secondary: #ffffff;--color-bg-tertiary: #f1f5f9;--color-bg-card: #ffffff;--color-bg-hover: #e2e8f0;--color-text-primary: #1e293b;--color-text-secondary: #475569;--color-text-muted: #94a3b8;--color-accent-primary: #3b82f6;--color-accent-secondary: #6366f1;--color-accent-success: #10b981;--color-accent-warning: #f59e0b;--color-accent-danger: #ef4444;--glass-bg: rgba(255, 255, 255, .85);--glass-bg-light: rgba(255, 255, 255, .7);--glass-border: rgba(0, 0, 0, .08);--shadow-sm: 0 2px 4px rgba(0, 0, 0, .05);--shadow-md: 0 4px 12px rgba(0, 0, 0, .08);--shadow-lg: 0 8px 24px rgba(0, 0, 0, .1);--shadow-xl: 0 16px 32px rgba(0, 0, 0, .12);--shadow-glow: 0 0 24px rgba(59, 130, 246, .1);--shadow-glow-strong: 0 0 40px rgba(59, 130, 246, .15);--shadow-inner: inset 0 1px 0 rgba(255, 255, 255, .8)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;scroll-behavior:smooth}body{font-family:var(--font-sans);background:var(--color-bg-primary);color:var(--color-text-primary);line-height:1.6;min-height:100vh;-webkit-font-smoothing:antialiased}.app{display:flex;min-height:100vh}.sidebar{width:260px;background:var(--glass-bg);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);border-right:1px solid var(--glass-border);display:flex;flex-direction:column;position:fixed;top:0;left:0;height:100vh;z-index:100;box-shadow:var(--shadow-inner)}.sidebar-header{padding:var(--space-lg);border-bottom:1px solid var(--color-bg-tertiary)}.logo{display:flex;align-items:center;gap:var(--space-sm);font-size:1.5rem;font-weight:700;color:var(--color-accent-primary)}.logo-icon{width:36px;height:36px;background:linear-gradient(135deg,var(--color-accent-primary),var(--color-accent-secondary));border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center}.sidebar-nav{flex:1;padding:var(--space-md);overflow-y:auto}.nav-section{margin-bottom:var(--space-lg)}.nav-section-title{font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em;color:var(--color-text-muted);padding:var(--space-sm) var(--space-sm)}.nav-item{display:flex;align-items:center;gap:var(--space-sm);padding:var(--space-sm) var(--space-md);min-height:44px;border-radius:var(--radius-md);color:var(--color-text-secondary);text-decoration:none;transition:all var(--transition-fast);cursor:pointer}.nav-item:hover{background:var(--color-bg-hover);color:var(--color-text-primary)}.nav-item.active{background:linear-gradient(135deg,#60a5fa26,#818cf81a);color:var(--color-accent-primary);border:1px solid rgba(96,165,250,.2)}.nav-item-icon{width:20px;height:20px;opacity:.8}.nav-item-badge{margin-left:auto;background:var(--color-accent-primary);color:var(--color-bg-primary);font-size:.75rem;font-weight:600;padding:2px 8px;border-radius:var(--radius-full)}.main-content{flex:1;margin-left:260px;padding:var(--space-xl);min-height:100vh}.content-container{max-width:1200px;margin-left:auto;margin-right:auto;width:100%}.reading-content,.topic-content,.prose{max-width:800px;margin-left:auto;margin-right:auto}.page-header{margin-bottom:var(--space-xl)}.page-title{font-size:2rem;font-weight:700;margin-bottom:var(--space-xs)}.page-subtitle{color:var(--color-text-secondary)}.card{background:var(--glass-bg);backdrop-filter:var(--glass-blur-light);-webkit-backdrop-filter:var(--glass-blur-light);border:1px solid var(--glass-border);border-radius:var(--radius-lg);padding:var(--space-lg);transition:all var(--transition-normal);box-shadow:var(--shadow-sm),var(--shadow-inner)}.card:hover{border-color:#60a5fa4d;box-shadow:var(--shadow-glow),var(--shadow-md);transform:translateY(-2px)}.card-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:var(--space-md)}.card-title{font-size:1.125rem;font-weight:600}.grid{display:grid;gap:var(--space-lg)}.grid-2{grid-template-columns:repeat(2,1fr)}.grid-3{grid-template-columns:repeat(3,1fr)}.grid-4{grid-template-columns:repeat(4,1fr)}@media(max-width:1200px){.grid-4,.grid-3{grid-template-columns:repeat(2,1fr)}}@media(max-width:768px){.grid-4,.grid-3,.grid-2{grid-template-columns:1fr}.sidebar{transform:translate(-100%)}.main-content{margin-left:0}}.subspecialty-card{position:relative;overflow:hidden}.subspecialty-card:before{content:"";position:absolute;top:0;left:0;width:4px;height:100%;background:var(--subspecialty-color, var(--color-accent-primary))}.subspecialty-icon{width:48px;height:48px;background:#60a5fa1a;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;font-size:1.5rem;margin-bottom:var(--space-md)}.subspecialty-stats{display:flex;gap:var(--space-lg);margin-top:var(--space-md);padding-top:var(--space-md);border-top:1px solid var(--color-bg-tertiary)}.stat{text-align:center}.stat-value{font-size:1.25rem;font-weight:700;color:var(--color-accent-primary)}.stat-label{font-size:.75rem;color:var(--color-text-muted)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-sm);padding:var(--space-sm) var(--space-lg);border:none;border-radius:var(--radius-md);font-size:.9rem;font-weight:500;cursor:pointer;transition:all var(--transition-fast);text-decoration:none;position:relative;overflow:hidden}.btn-primary{background:linear-gradient(135deg,var(--color-accent-primary),var(--color-accent-secondary));color:#fff;box-shadow:0 4px 16px #60a5fa40}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 24px #60a5fa59}.btn-secondary{background:var(--glass-bg);-webkit-backdrop-filter:var(--glass-blur-light);backdrop-filter:var(--glass-blur-light);color:var(--color-text-primary);border:1px solid var(--glass-border)}.btn-secondary:hover{background:var(--color-bg-hover)}.btn-outline{background:transparent;color:var(--color-accent-primary);border:1px solid var(--color-accent-primary)}.btn-outline:hover{background:#60a5fa1a}.btn-icon{min-width:44px;min-height:44px;width:44px;height:44px;padding:0;border-radius:var(--radius-md)}.btn-lg{padding:var(--space-md) var(--space-xl);font-size:1rem}.flashcard-container{perspective:1000px;width:100%;max-width:600px;height:400px;margin:0 auto}.flashcard{position:relative;width:100%;height:100%;transform-style:preserve-3d;transition:transform .4s cubic-bezier(.4,0,.2,1);cursor:pointer}.flashcard.flipped{transform:rotateY(180deg)}.flashcard-face{position:absolute;width:100%;height:100%;backface-visibility:hidden;background:var(--color-bg-card);border:1px solid var(--color-bg-tertiary);border-radius:var(--radius-lg);padding:var(--space-xl);display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center}.flashcard-back{transform:rotateY(180deg);background:linear-gradient(135deg,var(--color-bg-card),var(--color-bg-secondary))}.flashcard-content{font-size:1.25rem;line-height:1.8}.flashcard-hint{position:absolute;bottom:var(--space-lg);color:var(--color-text-muted);font-size:.875rem}.quality-buttons{display:flex;gap:var(--space-sm);justify-content:center;flex-wrap:wrap;margin-top:var(--space-xl)}.quality-btn{padding:var(--space-sm) var(--space-md);border:2px solid;border-radius:var(--radius-md);background:transparent;cursor:pointer;transition:all var(--transition-fast);font-weight:500}.quality-btn:hover{transform:scale(1.05)}.progress-bar{width:100%;height:8px;background:var(--color-bg-tertiary);border-radius:var(--radius-full);overflow:hidden}.progress-fill{height:100%;background:linear-gradient(90deg,var(--color-accent-primary),var(--color-accent-secondary));border-radius:var(--radius-full);transition:width var(--transition-normal)}.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--space-md)}.stat-card{background:var(--color-bg-card);border:1px solid var(--color-bg-tertiary);border-radius:var(--radius-lg);padding:var(--space-lg);text-align:center}.stat-card-value{font-size:2rem;font-weight:700;background:linear-gradient(135deg,var(--color-accent-primary),var(--color-accent-secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.stat-card-label{color:var(--color-text-secondary);margin-top:var(--space-xs)}.stat-card-animated{animation:fadeInUp .5s ease-out backwards}@media(prefers-reduced-motion:reduce){.stat-card-animated{animation:none}}.editor-container{background:var(--color-bg-card);border:1px solid var(--color-bg-tertiary);border-radius:var(--radius-lg);overflow:hidden}.editor-toolbar{display:flex;gap:var(--space-xs);padding:var(--space-sm);background:var(--color-bg-secondary);border-bottom:1px solid var(--color-bg-tertiary);flex-wrap:wrap}.toolbar-btn{width:36px;height:36px;display:flex;align-items:center;justify-content:center;background:transparent;border:none;border-radius:var(--radius-sm);color:var(--color-text-secondary);cursor:pointer;transition:all var(--transition-fast)}.toolbar-btn:hover{background:var(--color-bg-hover);color:var(--color-text-primary)}.toolbar-btn.active{background:var(--color-accent-primary);color:#fff}.editor-content{min-height:400px;padding:var(--space-lg)}.editor-content:focus{outline:none}.ProseMirror{min-height:400px;outline:none}.ProseMirror p{margin-bottom:var(--space-md)}.ProseMirror h1,.ProseMirror h2,.ProseMirror h3{margin:var(--space-lg) 0 var(--space-md);font-weight:600}.ProseMirror ul,.ProseMirror ol{padding-left:var(--space-xl);margin-bottom:var(--space-md)}.ProseMirror img{max-width:100%;height:auto;border-radius:var(--radius-md);margin:var(--space-md) 0}.ProseMirror blockquote{border-left:4px solid var(--color-accent-primary);padding-left:var(--space-md);margin:var(--space-md) 0;color:var(--color-text-secondary);font-style:italic}.reading-article{position:relative;background:var(--color-bg-card);border:1px solid var(--color-bg-tertiary);border-radius:var(--radius-lg);padding:80px 32px 24px;margin-bottom:var(--space-xl)}.prose{font-family:var(--font-reading)!important;color:#e8eaed;line-height:2;letter-spacing:.01em;max-width:100%;margin:0;font-size:1.1rem;font-weight:400}.prose *:not(code):not(pre):not(kbd):not(.katex):not(.katex *){font-family:var(--font-reading)!important}.prose p,.prose li,.prose span:not(.katex *),.prose div:not(.katex),.prose strong,.prose em,.prose a,.prose td,.prose th{font-family:var(--font-reading)!important}.katex-inline-wrapper{display:inline-block;white-space:nowrap;vertical-align:middle;line-height:1}.katex,.katex-display,.prose .katex,.reading-content .katex,.reading-article .katex{line-height:1.2}.katex *,.katex-html,.katex .base,.katex .mord,.katex .mop,.katex .msupsub{line-height:normal}.prose .katex,.prose .katex *{font-family:KaTeX_Main,Times New Roman,serif!important}.prose p{margin-bottom:1.75em;text-align:left}.prose h1{font-family:Prompt,sans-serif;font-size:2em;font-weight:700;margin:2em 0 1em;color:var(--color-text-primary);border-bottom:3px solid var(--color-accent-primary);padding-bottom:.5em;letter-spacing:-.02em}.prose h2{font-family:Prompt,sans-serif;font-size:1.6em;font-weight:600;margin:2em 0 .75em;color:var(--color-text-primary);border-left:5px solid var(--color-accent-secondary);background:linear-gradient(90deg,rgba(139,92,246,.1),transparent);padding:.5em .75em;border-radius:0 8px 8px 0}.prose h3{font-family:Prompt,sans-serif;font-size:1.35em;font-weight:600;margin:1.75em 0 .6em;color:var(--color-accent-primary);border-left:4px solid var(--color-accent-primary);padding-left:.75em}.prose h4{font-family:Prompt,sans-serif;font-size:1.15em;font-weight:600;margin:1.5em 0 .5em;color:var(--color-text-secondary);border-left:3px solid var(--color-bg-tertiary);padding-left:.5em}.prose h5,.prose h6{font-family:Prompt,sans-serif;font-size:1.05em;font-weight:500;margin:1em 0 .4em;color:var(--color-text-muted)}.prose ul,.prose ol{margin:1.25em 0;padding-left:1.5em}.prose ul{list-style-type:disc}.prose ul ul{list-style-type:circle;margin:.5em 0;padding-left:1.75em}.prose ul ul ul{list-style-type:square}.prose ol{list-style-type:decimal}.prose ol ol{list-style-type:lower-alpha;margin:.5em 0;padding-left:1.75em}.prose ol ol ol{list-style-type:lower-roman}.prose li{margin-bottom:.75em;line-height:1.9;padding-left:.35em}.prose li::marker{color:var(--color-accent-primary);font-weight:600}.prose li li{margin-bottom:.5em}.prose strong{font-weight:600;color:var(--color-accent-primary)}.prose blockquote{margin:1.75em 0;padding:1.25em 1.5em;background:var(--color-bg-tertiary);border-left:4px solid var(--color-accent-primary);border-radius:0 var(--radius-md) var(--radius-md) 0;color:var(--color-text-secondary);font-style:italic}.prose blockquote:has(strong:first-child),.prose p:has(strong:first-child):has([class*=tip]),.prose [class*=exam-tip],.prose [class*=radlecture]{margin:2em 0;padding:1.5em;background:linear-gradient(135deg,#8b5cf626,#60a5fa1a);border:2px solid var(--color-accent-secondary);border-radius:12px;font-style:normal;position:relative}.prose [class*=exam-tip]:before,.prose [class*=radlecture]:before{content:"💡 Exam Tip";display:block;font-weight:700;color:var(--color-accent-secondary);margin-bottom:.75em;font-size:.9em;text-transform:uppercase;letter-spacing:.1em}.prose pre,.prose code{font-family:"JetBrains Mono","Fira Code",var(--font-mono);background:var(--color-bg-tertiary);border-radius:var(--radius-sm)}.prose code{padding:.2em .5em;font-size:.9em;color:#f472b6;background:#f472b61a;border:1px solid rgba(244,114,182,.2);border-radius:6px;font-weight:500}.prose pre{padding:1.25em;margin:1.5em 0;overflow-x:auto;border:1px solid var(--color-bg-hover);border-radius:12px}.prose pre code{padding:0;background:transparent;border:none;color:var(--color-text-primary)}.prose kbd{display:inline-block;padding:.2em .6em;font-family:Prompt,sans-serif;font-size:.85em;font-weight:600;color:#fbbf24;background:#fbbf2426;border:1px solid rgba(251,191,36,.3);border-radius:6px}.prose img{display:inline-block;width:24px;height:24px;object-fit:cover;border-radius:6px;margin:0 4px;vertical-align:middle;border:2px solid var(--color-accent-primary);cursor:pointer;transition:all .2s ease;box-shadow:0 2px 8px #60a5fa4d}.prose img:hover{transform:scale(1.05);border-color:var(--color-accent-primary);box-shadow:0 4px 12px #60a5fa66}.prose table{width:100%;margin:1.75em 0;border-collapse:collapse;border:1px solid var(--color-bg-tertiary);border-radius:var(--radius-md);overflow:hidden}.prose th,.prose td{padding:.85em 1em;text-align:left;border-bottom:1px solid var(--color-bg-tertiary)}.prose th{background:var(--color-bg-tertiary);font-weight:600;color:var(--color-text-primary)}.prose tr:hover{background:var(--color-bg-hover)}.prose a{color:var(--color-accent-primary);text-decoration:none;border-bottom:1px solid transparent;transition:border-color var(--transition-fast)}.prose a:hover{border-bottom-color:var(--color-accent-primary)}.prose hr{margin:2.5em 0;border:none;height:2px;background:linear-gradient(90deg,transparent,var(--color-bg-tertiary),transparent)}.prose .collapsible-section{margin:1.5em 0;border:1px solid var(--color-bg-tertiary);border-radius:12px;overflow:hidden}.prose .collapsible-header{display:flex;align-items:center;justify-content:space-between;padding:1em 1.25em;background:var(--color-bg-tertiary);cursor:pointer;-webkit-user-select:none;user-select:none;transition:all .2s}.prose .collapsible-header:hover{background:var(--color-bg-hover)}.prose .collapsible-header h2,.prose .collapsible-header h3,.prose .collapsible-header h4{margin:0;padding:0;border:none;background:none}.prose .collapsible-toggle{width:24px;height:24px;display:flex;align-items:center;justify-content:center;background:var(--color-bg-hover);border-radius:6px;color:var(--color-text-secondary);transition:transform .3s ease}.prose .collapsible-section.collapsed .collapsible-toggle{transform:rotate(-90deg)}.prose .collapsible-content{padding:1.25em;animation:slideDown .3s ease}.prose .collapsible-section.collapsed .collapsible-content{display:none}@keyframes slideDown{0%{opacity:0;max-height:0}to{opacity:1;max-height:2000px}}.quiz-container{max-width:800px;margin:0 auto}.quiz-question{font-size:1.25rem;font-weight:500;margin-bottom:var(--space-xl)}.quiz-options{display:flex;flex-direction:column;gap:var(--space-md)}.quiz-option{display:flex;align-items:center;gap:var(--space-md);padding:var(--space-md) var(--space-lg);background:var(--color-bg-card);border:2px solid var(--color-bg-tertiary);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast)}.quiz-option:hover{border-color:var(--color-accent-primary);background:var(--color-bg-hover)}.quiz-option.selected{border-color:var(--color-accent-primary);background:#60a5fa1a}.quiz-option.correct{border-color:var(--color-accent-success);background:#34d3991a}.quiz-option.incorrect{border-color:var(--color-accent-danger);background:#f871711a}.quiz-option-letter{width:32px;height:32px;display:flex;align-items:center;justify-content:center;background:var(--color-bg-tertiary);border-radius:var(--radius-sm);font-weight:600}.form-group{margin-bottom:var(--space-lg)}.form-label{display:block;margin-bottom:var(--space-sm);font-weight:500;color:var(--color-text-secondary)}.form-input{width:100%;padding:var(--space-sm) var(--space-md);background:var(--color-bg-tertiary);border:1px solid var(--color-bg-hover);border-radius:var(--radius-md);color:var(--color-text-primary);font-size:1rem;transition:all var(--transition-fast)}.form-input:focus{outline:none;border-color:var(--color-accent-primary);box-shadow:0 0 0 3px #60a5fa1a}.form-input::placeholder{color:var(--color-text-muted)}select.form-input{cursor:pointer}textarea.form-input{min-height:120px;resize:vertical}.topic-list{display:flex;flex-direction:column;gap:var(--space-md)}.topic-item{display:flex;align-items:center;gap:var(--space-md);padding:var(--space-md) var(--space-lg);background:var(--color-bg-card);border:1px solid var(--color-bg-tertiary);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast)}.topic-item:hover{border-color:var(--color-accent-primary);transform:translate(4px)}.topic-subspecialty-badge{padding:var(--space-xs) var(--space-sm);background:#60a5fa1a;border-radius:var(--radius-sm);font-size:.75rem;font-weight:500}.topic-title{flex:1;font-weight:500}.topic-meta{color:var(--color-text-muted);font-size:.875rem}.modal-overlay{position:fixed;inset:0;background:#0009;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);display:flex;align-items:center;justify-content:center;z-index:1000;animation:fadeIn .2s ease}.modal{background:var(--glass-bg);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);border:1px solid var(--glass-border);border-radius:var(--radius-xl);width:90%;max-width:600px;max-height:90vh;overflow-y:auto;animation:slideUp .3s ease;box-shadow:var(--shadow-xl),var(--shadow-inner)}.modal-header{display:flex;align-items:center;justify-content:space-between;padding:var(--space-lg);border-bottom:1px solid var(--color-bg-tertiary)}.modal-title{font-size:1.25rem;font-weight:600}.modal-body{padding:var(--space-lg)}.modal-footer{display:flex;gap:var(--space-md);justify-content:flex-end;padding:var(--space-lg);border-top:1px solid var(--color-bg-tertiary)}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.empty-state{text-align:center;padding:var(--space-2xl);color:var(--color-text-muted)}.empty-state-icon{font-size:4rem;margin-bottom:var(--space-lg);opacity:.5}.empty-state-title{font-size:1.25rem;font-weight:500;color:var(--color-text-primary);margin-bottom:var(--space-sm)}.loading{display:flex;align-items:center;justify-content:center;padding:var(--space-2xl)}.spinner{width:40px;height:40px;border:3px solid var(--color-bg-tertiary);border-top-color:var(--color-accent-primary);border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.spin{animation:spin 1s linear 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