:root{--bg-primary: #fcfbfa;--bg-secondary: #ffffff;--text-primary: #111111;--text-secondary: #666666;--border: #eae9e6;--border-focus: #111111;--accent: #111111;--accent-light: #f5f4f0;--success: #111111;--shadow: rgba(0, 0, 0, .03);--font-serif: "Cormorant Garamond", Georgia, serif;--font-sans: "Outfit", system-ui, -apple-system, sans-serif;--max-width: 480px}[data-theme=dark]{--bg-primary: #0b0b0a;--bg-secondary: #121211;--text-primary: #f5f5f3;--text-secondary: #999995;--border: #222220;--border-focus: #f5f5f3;--accent: #f5f5f3;--accent-light: #1c1c1a;--success: #f5f5f3;--shadow: rgba(0, 0, 0, .2)}*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}body{font-family:var(--font-sans);background-color:#efeeea;color:var(--text-primary);display:flex;justify-content:center;min-height:100vh;overflow-x:hidden;transition:background-color .3s ease}#root{width:100%;max-width:var(--max-width);background-color:var(--bg-primary);min-height:100vh;display:flex;flex-direction:column;position:relative;box-shadow:0 0 40px #0000000d;border-left:1px solid var(--border);border-right:1px solid var(--border);transition:background-color .3s ease,border-color .3s ease}h1,h2,h3,h4{font-family:var(--font-serif);font-weight:600;line-height:1.15;letter-spacing:-.02em}p,li,span,input,button,textarea{font-family:var(--font-sans);line-height:1.6}.brand-title{font-family:var(--font-serif);font-size:2.2rem;font-weight:700;letter-spacing:-.03em;text-align:center;margin-bottom:.25rem}.brand-subtitle{font-size:.75rem;text-transform:uppercase;letter-spacing:.15em;color:var(--text-secondary);text-align:center;margin-bottom:2rem}.btn{background:var(--bg-secondary);color:var(--text-primary);border:1px solid var(--border);padding:.75rem 1.25rem;border-radius:9999px;font-weight:500;font-size:.875rem;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:.5rem;transition:all .2s cubic-bezier(.4,0,.2,1);box-shadow:0 2px 4px var(--shadow)}.btn:active{transform:scale(.97)}.btn-primary{background:var(--accent);color:var(--bg-secondary);border-color:var(--accent)}.btn-icon{width:2.75rem;height:2.75rem;padding:0;border-radius:50%}.bottom-nav{position:fixed;bottom:0;left:50%;transform:translate(-50%);width:100%;max-width:var(--max-width);background-color:rgba(var(--bg-secondary),.8);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-top:1px solid var(--border);display:flex;justify-content:space-around;align-items:center;padding:.5rem 0 1.5rem;z-index:100;box-shadow:0 -4px 20px #00000005}.nav-item{display:flex;flex-direction:column;align-items:center;gap:.25rem;background:none;border:none;color:var(--text-secondary);cursor:pointer;padding:.5rem;transition:color .2s ease;width:20%}.nav-item.active{color:var(--accent)}.nav-item span{font-size:.65rem;font-weight:500;letter-spacing:.05em}.content-area{flex:1;padding:1.5rem 1.5rem 6.5rem;display:flex;flex-direction:column}.card{background:var(--bg-secondary);border:1px solid var(--border);border-radius:16px;padding:1.5rem;box-shadow:0 4px 12px var(--shadow);margin-bottom:1.5rem;transition:all .3s ease}.flashcard-container{perspective:1000px;height:240px;width:100%;margin-bottom:2rem}.flashcard{position:relative;width:100%;height:100%;transform-style:preserve-3d;transition:transform .6s cubic-bezier(.4,0,.2,1);cursor:pointer}.flashcard.flipped{transform:rotateY(180deg)}.card-face{position:absolute;width:100%;height:100%;backface-visibility:hidden;border-radius:20px;border:1px solid var(--border);background:var(--bg-secondary);display:flex;flex-direction:column;justify-content:center;align-items:center;padding:2rem;box-shadow:0 10px 25px var(--shadow)}.card-back{transform:rotateY(180deg)}.input-group{margin-bottom:1.25rem;display:flex;flex-direction:column;gap:.5rem}.input-label{font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em;color:var(--text-secondary)}.input-field{background:var(--bg-secondary);border:1px solid var(--border);color:var(--text-primary);padding:.85rem 1.25rem;border-radius:12px;font-size:.95rem;outline:none;transition:all .2s ease}.input-field:focus{border-color:var(--border-focus)}.pdf-container{position:relative;width:100%;background:#fff;border:1px solid var(--border);border-radius:12px;overflow:hidden;box-shadow:0 4px 20px var(--shadow);display:flex;justify-content:center;align-items:center}.pdf-canvas{width:100%!important;height:auto!important;display:block}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.animate-fade-in{animation:fadeIn .4s cubic-bezier(.16,1,.3,1) forwards}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--text-secondary)}