:root{--color-primary: #6366f1;--color-primary-light: #818cf8;--color-primary-dark: #4f46e5;--color-secondary: #a855f7;--color-accent: #06b6d4;--color-accent-warm: #f472b6;--color-primary-50: #eef2ff;--color-primary-100: #e0e7ff;--color-primary-200: #c7d2fe;--color-primary-300: #a5b4fc;--color-primary-400: #818cf8;--color-primary-500: #6366f1;--color-primary-600: #4f46e5;--color-primary-700: #4338ca;--color-primary-800: #3730a3;--color-primary-900: #312e81;--color-success: #10b981;--color-success-light: #d1fae5;--color-success-dark: #059669;--color-warning: #f59e0b;--color-warning-light: #fef3c7;--color-warning-dark: #d97706;--color-error: #ef4444;--color-error-light: #fee2e2;--color-error-dark: #dc2626;--color-info: #3b82f6;--color-info-light: #dbeafe;--color-info-dark: #2563eb;--color-gray-50: #f8fafc;--color-gray-100: #f1f5f9;--color-gray-200: #e2e8f0;--color-gray-300: #cbd5e1;--color-gray-400: #94a3b8;--color-gray-500: #64748b;--color-gray-600: #475569;--color-gray-700: #334155;--color-gray-800: #1e293b;--color-gray-900: #0f172a;--surface-0: #070b14;--surface-1: #0d1424;--surface-2: #111827;--surface-3: #1a2235;--surface-4: #1e2a3d;--surface-5: #243047;--text-primary: #f0f4ff;--text-secondary: #94a3b8;--text-tertiary: #64748b;--text-inverse: #0f172a;--text-accent: #818cf8;--border-subtle: rgba(99, 102, 241, .08);--border-default: rgba(99, 102, 241, .15);--border-strong: rgba(99, 102, 241, .3);--border-glow: rgba(99, 102, 241, .5);--color-surface: var(--surface-2);--color-surface-muted: var(--surface-1);--color-surface-elevated: var(--surface-3);--color-surface-base: var(--surface-2);--color-surface-raised: var(--surface-3);--color-surface-overlay: rgba(13, 20, 36, .95);--color-border: var(--border-default);--color-border-light: var(--border-subtle);--color-border-subtle: var(--border-subtle);--color-border-default: var(--border-default);--color-border-strong: var(--border-strong);--color-text: var(--text-primary);--color-text-muted: var(--text-secondary);--color-text-light: var(--text-tertiary);--color-text-primary: var(--text-primary);--color-text-secondary: var(--text-secondary);--color-text-tertiary: var(--text-tertiary);--color-text-inverse: var(--text-inverse);--glass-bg: rgba(17, 24, 39, .7);--glass-border: rgba(99, 102, 241, .12);--glass-blur: blur(20px);--glass-shadow: 0 8px 32px rgba(0, 0, 0, .4), 0 0 0 1px rgba(99, 102, 241, .08);--glow-primary: 0 0 40px rgba(99, 102, 241, .25);--glow-accent: 0 0 40px rgba(6, 182, 212, .2);--glow-warm: 0 0 40px rgba(244, 114, 182, .2);--font-family: "Inter", system-ui, -apple-system, sans-serif;--font-sans: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--font-mono: "SF Mono", Monaco, "Cascadia Code", "Courier New", monospace;--font-size-xs: .75rem;--font-size-sm: .875rem;--font-size-base: 1rem;--font-size-lg: 1.125rem;--font-size-xl: 1.25rem;--font-size-2xl: 1.5rem;--font-size-3xl: 1.875rem;--font-size-4xl: 2.25rem;--font-size-5xl: 3rem;--font-weight-normal: 400;--font-weight-medium: 500;--font-weight-semibold: 600;--font-weight-bold: 700;--font-weight-extrabold: 800;--line-height-tight: 1.25;--line-height-snug: 1.375;--line-height-normal: 1.5;--line-height-relaxed: 1.625;--line-height-loose: 2;--letter-spacing-tight: -.02em;--letter-spacing-normal: 0;--letter-spacing-wide: .025em;--letter-spacing-wider: .05em;--space-0: 0;--space-px: 1px;--space-0-5: .125rem;--space-1: .25rem;--space-1-5: .375rem;--space-2: .5rem;--space-2-5: .625rem;--space-3: .75rem;--space-4: 1rem;--space-5: 1.25rem;--space-6: 1.5rem;--space-7: 1.75rem;--space-8: 2rem;--space-10: 2.5rem;--space-12: 3rem;--space-16: 4rem;--space-20: 5rem;--space-24: 6rem;--shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, .3);--shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, .4), 0 1px 2px -1px rgba(0, 0, 0, .4);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .4), 0 2px 4px -2px rgba(0, 0, 0, .4);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .5), 0 4px 6px -4px rgba(0, 0, 0, .4);--shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, .5), 0 8px 10px -6px rgba(0, 0, 0, .4);--shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, .6);--shadow-focus: 0 0 0 3px rgba(99, 102, 241, .4);--shadow-focus-error: 0 0 0 3px rgba(239, 68, 68, .4);--shadow-focus-success: 0 0 0 3px rgba(16, 185, 129, .4);--radius-none: 0;--radius-xs: 4px;--radius-sm: 6px;--radius-base: 8px;--radius-md: 12px;--radius-lg: 16px;--radius-xl: 20px;--radius-2xl: 24px;--radius-3xl: 32px;--radius-full: 9999px;--duration-instant: 0ms;--duration-fast: .15s;--duration-base: .25s;--duration-slow: .35s;--duration-slower: .5s;--ease-linear: linear;--ease-in: cubic-bezier(.4, 0, 1, 1);--ease-out: cubic-bezier(0, 0, .2, 1);--ease-in-out: cubic-bezier(.4, 0, .2, 1);--ease-spring: cubic-bezier(.16, 1, .3, 1);--ease-bounce: cubic-bezier(.68, -.55, .265, 1.55);--transition-fast: var(--duration-fast) var(--ease-out);--transition-base: var(--duration-base) var(--ease-in-out);--transition-slow: var(--duration-slow) var(--ease-in-out);--transition-spring: var(--duration-slower) var(--ease-spring)}[data-theme=light]{--surface-0: #f8fafc;--surface-1: #ffffff;--surface-2: #ffffff;--surface-3: #f1f5f9;--surface-4: #e2e8f0;--surface-5: #cbd5e1;--text-primary: #0f172a;--text-secondary: #475569;--text-tertiary: #94a3b8;--text-accent: #4f46e5;--border-subtle: rgba(99, 102, 241, .08);--border-default: rgba(99, 102, 241, .2);--border-strong: rgba(99, 102, 241, .4);--glass-bg: rgba(255, 255, 255, .85);--glass-border: rgba(99, 102, 241, .15);--glass-blur: blur(20px);--glass-shadow: 0 4px 24px rgba(99, 102, 241, .08), 0 0 0 1px rgba(99, 102, 241, .08);--glow-primary: 0 0 40px rgba(99, 102, 241, .12)}*,*:before,*:after{box-sizing:border-box}*:focus-visible{outline:2px solid var(--color-primary);outline-offset:2px}html{-webkit-tap-highlight-color:transparent;scroll-behavior:smooth}body{margin:0;font-family:var(--font-sans);background-color:var(--surface-1);min-height:100vh;color:var(--text-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizeLegibility;overflow-x:hidden}body:before{content:"";position:fixed;top:0;right:0;bottom:0;left:0;background:radial-gradient(ellipse 100% 80% at 10% 0%,rgba(99,102,241,.18) 0%,transparent 55%),radial-gradient(ellipse 80% 60% at 90% 100%,rgba(168,85,247,.14) 0%,transparent 55%),radial-gradient(ellipse 60% 50% at 50% 50%,rgba(6,182,212,.06) 0%,transparent 60%),radial-gradient(ellipse 40% 30% at 80% 20%,rgba(244,114,182,.08) 0%,transparent 50%);pointer-events:none;z-index:0}@media(prefers-reduced-motion:no-preference){body:before{animation:meshDrift 25s ease-in-out infinite alternate}@keyframes meshDrift{0%{opacity:.7;transform:scale(1) rotate(0)}50%{opacity:1;transform:scale(1.05) rotate(2deg)}to{opacity:.8;transform:scale(.98) rotate(-1deg)}}}h1,h2,h3,h4,h5,h6{text-wrap:balance;font-family:var(--font-sans);color:var(--text-primary)}p,li{text-wrap:pretty}@keyframes fadeInUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes scaleIn{0%{opacity:0;transform:scale(.94)}to{opacity:1;transform:scale(1)}}@keyframes shimmer{0%{background-position:-200% center}to{background-position:200% center}}@keyframes pulse{0%,to{opacity:1}50%{opacity:.4}}@keyframes glowPulse{0%,to{box-shadow:0 0 20px #6366f133}50%{box-shadow:0 0 40px #6366f180}}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-8px)}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.01ms!important;transition-duration:.01ms!important}}:root{--btn-height-sm: 40px;--btn-height-md: 48px;--btn-height-lg: 56px;--btn-radius: 8px;--card-padding: 24px;--card-radius: 12px}@media print{.navbar,.app-tabs,.fab-main,.fab-actions,.profile-section,.upload-section,.progress-tracker,.onboarding-modal,.toast-container,.read-aloud-controls,.complexity-dial,.floating-actions{display:none!important}body{background:#fff;color:#000}.card{break-inside:avoid;box-shadow:none;border:1px solid #ccc}}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}@keyframes processingDot{0%,80%,to{transform:scale(.5);opacity:.3}40%{transform:scale(1);opacity:1}}.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}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#6366f133;border-radius:999px}::-webkit-scrollbar-thumb:hover{background:#6366f166}::selection{background:#6366f14d;color:#f0f4ff}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:var(--btn-height-md);padding:0 20px;border-radius:var(--btn-radius);cursor:pointer;border:none;transition:transform var(--transition-fast),box-shadow var(--transition-fast);font-family:var(--font-sans);font-size:var(--font-size-sm);font-weight:var(--font-weight-medium)}.btn:hover{transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn-sm{height:var(--btn-height-sm);padding:0 14px;font-size:var(--font-size-xs)}.btn-lg{height:var(--btn-height-lg);padding:0 28px;font-size:var(--font-size-base)}.btn-primary{background:var(--color-primary);color:#fff}.btn-primary:hover{background:var(--color-primary-dark)}.btn-ghost{background:transparent;color:var(--color-primary-light);border:1px solid var(--border-default)}.btn-ghost:hover{background:#6366f114}.app-tabs{display:flex;align-items:center;gap:4px;padding:4px;background:var(--glass-bg);border-radius:var(--radius-md);border:1px solid var(--glass-border)}.app-tab{display:inline-flex;align-items:center;gap:6px;padding:8px 14px;border-radius:var(--radius-sm);cursor:pointer;border:none;background:transparent;color:var(--text-secondary);font-size:var(--font-size-sm);font-weight:var(--font-weight-medium);transition:background var(--transition-fast),color var(--transition-fast);text-decoration:none}.app-tab:hover{background:#6366f114;color:var(--text-primary)}.app-tab[aria-current=page]{background:#6366f126;color:var(--color-primary-light)}@media(max-width:768px){.app-tab span{display:none}.app-tab{padding:8px}}