:root{--bg-base: #0a0a0a;--bg-surface: #121212;--bg-surface-hover: #1a1a1a;--text-primary: #ededed;--text-secondary: #a1a1aa;--border-color: #27272a;--accent: #8b5cf6;--accent-hover: #7c3aed;--accent-glow: rgba(139, 92, 246, .2);--error: #ef4444;--success: #10b981}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica Neue,sans-serif;background-color:var(--bg-base);color:var(--text-primary);line-height:1.6;min-height:100vh;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}h1{font-size:2.5rem;font-weight:700;letter-spacing:-.05em;margin-bottom:.5rem;background:linear-gradient(135deg,#fff,#a1a1aa);-webkit-background-clip:text;-webkit-text-fill-color:transparent}h2{font-size:1.5rem;font-weight:600;letter-spacing:-.025em}p{color:var(--text-secondary)}.container{max-width:1200px;margin:0 auto;padding:2rem}header{display:flex;justify-content:space-between;align-items:center;padding:1.5rem 0;margin-bottom:3rem;border-bottom:1px solid var(--border-color)}.logo{font-weight:700;font-size:1.25rem;letter-spacing:-.025em;display:flex;align-items:center;gap:.5rem}.logo span{color:var(--accent)}textarea{width:100%;background-color:var(--bg-surface);color:var(--text-primary);border:1px solid var(--border-color);border-radius:12px;padding:1rem;font-family:inherit;font-size:1rem;resize:vertical;transition:all .2s ease}textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-glow)}button{background-color:var(--accent);color:#fff;border:none;border-radius:8px;padding:.75rem 1.5rem;font-size:1rem;font-weight:600;cursor:pointer;transition:all .2s ease;display:inline-flex;align-items:center;justify-content:center;gap:.5rem}button:hover{background-color:var(--accent-hover);transform:translateY(-1px)}button:disabled{opacity:.5;cursor:not-allowed;transform:none}.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1.5rem;margin-top:2rem}.flashcard{background-color:var(--bg-surface);border:1px solid var(--border-color);border-radius:16px;padding:1.5rem;height:250px;perspective:1000px;cursor:pointer;position:relative;transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease}.flashcard:hover{border-color:var(--accent);box-shadow:0 8px 30px #00000080;transform:translateY(-2px)}.flashcard-inner{position:absolute;top:0;left:0;width:100%;height:100%;text-align:center;transition:transform .6s cubic-bezier(.4,0,.2,1);transform-style:preserve-3d;display:flex;flex-direction:column}.flashcard.flipped .flashcard-inner{transform:rotateY(180deg)}.flashcard-front,.flashcard-back{position:absolute;top:0;left:0;width:100%;height:100%;-webkit-backface-visibility:hidden;backface-visibility:hidden;display:flex;flex-direction:column;justify-content:center;align-items:center;padding:2rem;border-radius:16px;background-color:var(--bg-surface)}.flashcard-back{transform:rotateY(180deg);background:linear-gradient(180deg,var(--bg-surface) 0%,rgba(139,92,246,.05) 100%);border:1px solid rgba(139,92,246,.2)}.card-label{position:absolute;top:1rem;left:1.5rem;font-size:.75rem;font-weight:600;letter-spacing:.05em;text-transform:uppercase;color:var(--accent)}.card-content{font-size:1.125rem;font-weight:500;line-height:1.5}.glass-panel{background:#121212b3;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid var(--border-color);border-radius:16px;padding:2rem}.pulse{animation:pulse 2s cubic-bezier(.4,0,.6,1) infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}