:root{--color-bg-primary: #ffffff;--color-bg-secondary: #f8f9fa;--color-text-primary: #1a1a1a;--color-text-secondary: #5a5a5a;--color-accent: #0f172a;--color-accent-hover: #334155;--color-border: #e2e8f0;--color-success: #10b981;--color-warning: #f59e0b;--color-error: #ef4444;--font-sans: "Inter", system-ui, -apple-system, sans-serif;--font-serif: "Merriweather", "Times New Roman", serif;--spacing-xs: .25rem;--spacing-sm: .5rem;--spacing-md: 1rem;--spacing-lg: 2rem;--spacing-xl: 4rem;--radius-sm: .25rem;--radius-md: .5rem}body{margin:0;padding:0;font-family:var(--font-sans);color:var(--color-text-primary);background-color:var(--color-bg-secondary);line-height:1.6;-webkit-font-smoothing:antialiased}h1,h2,h3,h4,h5,h6{margin:0;font-weight:600;color:var(--color-accent)}button{cursor:pointer;font-family:inherit}.container{max-width:1200px;margin:0 auto;padding:0 var(--spacing-md)}.card{background:var(--color-bg-primary);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:var(--spacing-lg);box-shadow:0 1px 3px #0000000d}.btn{display:inline-flex;align-items:center;justify-content:center;padding:.75rem 1.5rem;border-radius:var(--radius-sm);font-weight:500;transition:all .2s;border:none}.btn-primary{background-color:var(--color-accent);color:#fff}.btn-primary:hover{background-color:var(--color-accent-hover)}.academic-text{font-family:var(--font-serif);font-size:1.1rem;line-height:1.8;color:var(--color-text-primary)}.focus-mode{background-color:var(--color-bg-primary);min-height:100vh}