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#10B981;--color-success-light: #D1FAE5;--color-warning: #F59E0B;--color-warning-light: #FEF3C7;--color-error: #EF4444;--color-error-light: #FEE2E2;--color-info: #3B82F6;--color-info-light: #DBEAFE;--gradient-primary: linear-gradient(135deg, #6366F1, #8B5CF6);--gradient-math: linear-gradient(135deg, #6366F1, #818CF8);--gradient-physics: linear-gradient(135deg, #06B6D4, #22D3EE);--gradient-english: linear-gradient(135deg, #F43F5E, #FB7185);--gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 100%);--gradient-subtle: linear-gradient(180deg, #F8F9FC 0%, #EEF0F8 100%);--font-primary: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--font-mono: "JetBrains Mono", "Fira Code", monospace;--text-xs: .75rem;--text-sm: .875rem;--text-base: 1rem;--text-lg: 1.125rem;--text-xl: 1.25rem;--text-2xl: 1.5rem;--text-3xl: 1.875rem;--text-4xl: 2.25rem;--text-5xl: 3rem;--weight-light: 300;--weight-regular: 400;--weight-medium: 500;--weight-semibold: 600;--weight-bold: 700;--weight-extrabold: 800;--leading-tight: 1.2;--leading-normal: 1.5;--leading-relaxed: 1.7;--space-1: .25rem;--space-2: .5rem;--space-3: .75rem;--space-4: 1rem;--space-5: 1.25rem;--space-6: 1.5rem;--space-8: 2rem;--space-10: 2.5rem;--space-12: 3rem;--space-16: 4rem;--space-20: 5rem;--space-24: 6rem;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 14px;--radius-xl: 20px;--radius-2xl: 28px;--radius-full: 9999px;--shadow-xs: 0 1px 2px rgba(26, 29, 46, .04);--shadow-sm: 0 2px 8px rgba(26, 29, 46, .06);--shadow-md: 0 4px 16px rgba(26, 29, 46, .08);--shadow-lg: 0 8px 32px rgba(26, 29, 46, .1);--shadow-xl: 0 16px 48px rgba(26, 29, 46, .12);--shadow-glow-math: 0 8px 32px rgba(99, 102, 241, .2);--shadow-glow-physics: 0 8px 32px rgba(6, 182, 212, .2);--shadow-glow-english: 0 8px 32px rgba(244, 63, 94, .2);--transition-fast: .15s cubic-bezier(.4, 0, .2, 1);--transition-base: .25s cubic-bezier(.4, 0, .2, 1);--transition-slow: .4s cubic-bezier(.4, 0, .2, 1);--transition-spring: .5s cubic-bezier(.34, 1.56, .64, 1);--sidebar-width: 260px;--sidebar-collapsed: 72px;--header-height: 64px;--max-content: 1200px;--z-base: 0;--z-dropdown: 100;--z-sticky: 200;--z-overlay: 300;--z-modal: 400;--z-toast: 500}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{-webkit-text-size-adjust:100%;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizeLegibility;scroll-behavior:smooth}body{font-family:var(--font-primary);font-size:var(--text-base);font-weight:var(--weight-regular);line-height:var(--leading-normal);color:var(--text-primary);background-color:var(--bg-primary);min-height:100vh;overflow-x:hidden}img,svg,video{display:block;max-width:100%;height:auto}a{color:inherit;text-decoration:none}button{font:inherit;cursor:pointer;border:none;background:none;color:inherit}input,textarea,select{font:inherit;color:inherit;border:none;outline:none;background:transparent}ul,ol{list-style:none}h1,h2,h3,h4,h5,h6{font-weight:var(--weight-bold);line-height:var(--leading-tight)}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#1a1d2e26;border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:#1a1d2e40}:focus-visible{outline:2px solid var(--color-math);outline-offset:2px;border-radius:var(--radius-sm)}::selection{background:#6366f126;color:var(--text-primary)}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes fadeInUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes fadeInDown{0%{opacity:0;transform:translateY(-20px)}to{opacity:1;transform:translateY(0)}}@keyframes slideInLeft{0%{opacity:0;transform:translate(-24px)}to{opacity:1;transform:translate(0)}}@keyframes slideInRight{0%{opacity:0;transform:translate(24px)}to{opacity:1;transform:translate(0)}}@keyframes scaleIn{0%{opacity:0;transform:scale(.92)}to{opacity:1;transform:scale(1)}}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}@keyframes shimmer{0%{background-position:-200% 0}to{background-position:200% 0}}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-8px)}}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}@keyframes countUp{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@keyframes progressFill{0%{width:0%}to{width:var(--progress)}}@keyframes ripple{0%{transform:scale(0);opacity:.5}to{transform:scale(4);opacity:0}}@keyframes breathe{0%,to{box-shadow:0 0 #6366f133}50%{box-shadow:0 0 0 12px #6366f100}}@keyframes gradientShift{0%{background-position:0% 50%}50%{background-position:100% 50%}to{background-position:0% 50%}}.animate-fade-in{animation:fadeIn var(--transition-base) ease-out}.animate-fade-in-up{animation:fadeInUp var(--transition-slow) ease-out}.animate-scale-in{animation:scaleIn var(--transition-base) ease-out}.animate-pulse{animation:pulse 2s ease-in-out infinite}.animate-shimmer{background:linear-gradient(90deg,var(--bg-tertiary) 25%,var(--bg-secondary) 50%,var(--bg-tertiary) 75%);background-size:400% 100%;animation:shimmer 1.5s ease-in-out infinite}.animate-float{animation:float 3s ease-in-out infinite}.animate-breathe{animation:breathe 2s ease-in-out infinite}