:root{--font-serif: "Newsreader", Georgia, serif;--font-sans: "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-mono: "JetBrains Mono", monospace;--font-size-base: 18px;--line-height-body: 1.8;--bg-app: #fbf9f5;--bg-card: #ffffff;--bg-card-elevated: #ffffff;--bg-subtle: #f3f0ea;--border-subtle: #e7e2d9;--border-strong: #d3ccc0;--text-primary: #1e293b;--text-secondary: #475569;--text-muted: #64748b;--text-inverse: #ffffff;--brand-primary: #0f172a;--brand-accent: #d97706;--tier2-bg: rgba(245, 158, 11, .16);--tier2-border: #f59e0b;--tier2-text: #b45309;--tier2-badge-bg: #fef3c7;--tier2-badge-text: #92400e;--tier3-bg: rgba(59, 130, 246, .14);--tier3-border: #3b82f6;--tier3-text: #1d4ed8;--tier3-badge-bg: #dbeafe;--tier3-badge-text: #1e40af;--ell-bg: rgba(16, 185, 129, .18);--ell-border: #10b981;--ell-text: #047857;--ell-badge-bg: #d1fae5;--ell-badge-text: #065f46;--cognate-color: #8b5cf6;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .08), 0 2px 4px -1px rgba(0, 0, 0, .04);--shadow-lg: 0 10px 25px -3px rgba(0, 0, 0, .08), 0 4px 10px -2px rgba(0, 0, 0, .04);--shadow-popover: 0 20px 30px -10px rgba(15, 23, 42, .18);--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--radius-full: 9999px;--transition-fast: .15s ease;--transition-normal: .25s ease;--transition-smooth: .4s cubic-bezier(.16, 1, .3, 1)}[data-theme=warm]{--bg-app: #f4efea;--bg-card: #fffdfa;--bg-card-elevated: #ffffff;--bg-subtle: #eae3da;--border-subtle: #ded4c7;--border-strong: #c8baa9;--text-primary: #29231e;--text-secondary: #574c43;--text-muted: #807266;--tier2-bg: rgba(217, 119, 6, .18);--tier3-bg: rgba(37, 99, 235, .15);--ell-bg: rgba(5, 150, 105, .18)}[data-theme=dark]{--bg-app: #0f172a;--bg-card: #1e293b;--bg-card-elevated: #334155;--bg-subtle: #1e293b;--border-subtle: #334155;--border-strong: #475569;--text-primary: #f8fafc;--text-secondary: #cbd5e1;--text-muted: #94a3b8;--text-inverse: #0f172a;--brand-primary: #f8fafc;--brand-accent: #fbbf24;--tier2-bg: rgba(245, 158, 11, .28);--tier2-border: #fbbf24;--tier2-text: #fde68a;--tier2-badge-bg: #78350f;--tier2-badge-text: #fef3c7;--tier3-bg: rgba(59, 130, 246, .28);--tier3-border: #60a5fa;--tier3-text: #bfdbfe;--tier3-badge-bg: #1e3a8a;--tier3-badge-text: #dbeafe;--ell-bg: rgba(16, 185, 129, .28);--ell-border: #34d399;--ell-text: #a7f3d0;--ell-badge-bg: #064e3b;--ell-badge-text: #d1fae5;--cognate-color: #a78bfa;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .3);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .4);--shadow-lg: 0 10px 25px -3px rgba(0, 0, 0, .5);--shadow-popover: 0 20px 30px -10px rgba(0, 0, 0, .6)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-family:var(--font-sans);background-color:var(--bg-app);color:var(--text-primary);text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;transition:background-color var(--transition-normal),color var(--transition-normal)}body{min-height:100vh;display:flex;flex-direction:column}#root{display:flex;flex-direction:column;min-height:100vh}h1,h2,h3,h4{font-family:var(--font-sans);color:var(--text-primary);font-weight:700;letter-spacing:-.02em}p{line-height:var(--line-height-body)}a{color:inherit;text-decoration:none}button{font-family:inherit;cursor:pointer;border:none;background:none;font-size:inherit}.app-container{max-width:960px;margin:0 auto;padding:0 24px;width:100%}.reader-container{max-width:720px;margin:0 auto;padding:0 20px;width:100%}.vocab-word{display:inline;padding:2px 4px;border-radius:4px;cursor:pointer;font-weight:500;transition:background-color var(--transition-fast),transform var(--transition-fast);text-decoration:none;border-bottom:2px solid transparent}.vocab-word:hover{transform:translateY(-1px)}.vocab-word.tier2{background-color:var(--tier2-bg);border-bottom-color:var(--tier2-border);color:var(--tier2-text)}.vocab-word.tier3{background-color:var(--tier3-bg);border-bottom-color:var(--tier3-border);color:var(--tier3-text)}.vocab-word.ell{background-color:var(--ell-bg);border-bottom-color:var(--ell-border);color:var(--ell-text)}.vocab-word.cognate{border-bottom:2px dashed var(--cognate-color)!important}.vocab-word.active-selection{outline:2px solid var(--text-primary);outline-offset:2px}.tts-active-word{background-color:#fef08a!important;color:#0f172a!important;border-radius:4px;padding:2px 4px}.crossfade-wrapper{position:relative;transition:min-height var(--transition-smooth)}.crossfade-text{font-family:var(--font-serif);font-size:calc(var(--font-size-base) * var(--font-scale, 1));line-height:1.85;letter-spacing:-.01em;transition:opacity var(--transition-normal),transform var(--transition-normal)}.crossfade-text.fade-in{opacity:1;transform:translateY(0)}.crossfade-text.fade-out{opacity:0;transform:translateY(4px);position:absolute;top:0;left:0;right:0;pointer-events:none}@keyframes pulse-subtle{0%,to{opacity:1}50%{opacity:.6}}.pulse-anim{animation:pulse-subtle 2s infinite ease-in-out}@keyframes slide-up{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}.animate-slide-up{animation:slide-up .3s cubic-bezier(.16,1,.3,1) forwards}.glass-nav{background-color:#fbf9f5d9;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px)}[data-theme=warm] .glass-nav{background-color:#f4efead9}[data-theme=dark] .glass-nav{background-color:#0f172ad9}