:root{--primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);--secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);--bg-color: #f8f9ff;--text-color: #2d3748;--card-bg: rgba(255, 255, 255, .9);--glass-border: 1px solid rgba(255, 255, 255, .3);--shadow-sm: 0 4px 6px rgba(0, 0, 0, .05);--shadow-lg: 0 10px 30px rgba(0, 0, 0, .1);--radius-lg: 20px;--radius-md: 12px}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg-color);color:var(--text-color);min-height:100vh;display:flex;justify-content:center;align-items:center;padding:20px;background-image:radial-gradient(at 0% 0%,hsla(253,16%,7%,1) 0,transparent 50%),radial-gradient(at 50% 0%,hsla(225,39%,30%,1) 0,transparent 50%),radial-gradient(at 100% 0%,hsla(339,49%,30%,1) 0,transparent 50%);background-size:cover;background-attachment:fixed}#root{width:100%;max-width:800px}.container{background:var(--card-bg);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-radius:var(--radius-lg);border:var(--glass-border);box-shadow:var(--shadow-lg);padding:40px;width:100%;overflow:visible;transition:all .3s ease}h1{font-size:2.5rem;font-weight:800;text-align:center;margin-bottom:1rem;background:var(--primary-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;letter-spacing:-.02em}.subtitle{text-align:center;color:#718096;margin-bottom:2rem;font-size:1.1rem}.btn{padding:12px 24px;border-radius:var(--radius-md);border:none;font-weight:600;cursor:pointer;transition:all .2s ease;font-size:1rem;display:inline-flex;align-items:center;justify-content:center;gap:8px}.btn-primary{background:var(--primary-gradient);color:#fff;box-shadow:0 4px 15px #667eea66}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 20px 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0;cursor:pointer}.flashcard{position:relative;width:100%;height:100%;text-align:center;transition:transform .6s cubic-bezier(.4,0,.2,1);transform-style:preserve-3d;border-radius:var(--radius-lg);box-shadow:var(--shadow-lg)}.flashcard.no-flip-animation{transition:none}.flashcard.flipped{transform:rotateY(180deg)}.card-face{position:absolute;width:100%;height:100%;backface-visibility:hidden;display:flex;align-items:center;justify-content:center;padding:40px;border-radius:var(--radius-lg);font-size:1.5rem;line-height:1.6;overflow-y:auto}.card-front{background:#fff;color:#2d3748}.card-back{background:var(--primary-gradient);color:#fff;transform:rotateY(180deg)}.controls{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem;margin-top:2rem}.difficulty-btn{padding:15px;border:none;border-radius:var(--radius-md);color:#fff;font-weight:600;cursor:pointer;transition:transform .2s}.difficulty-btn:hover{transform:translateY(-2px);filter:brightness(1.1)}.btn-easy{background:#48bb78}.btn-medium{background:#ed8936}.btn-hard{background:#f56565}.nav-controls{display:flex;justify-content:space-between;margin-bottom:1rem}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@media(max-width:768px){body{align-items:flex-start;padding:12px;background-attachment:scroll}#root{max-width:100%}.container{padding:30px;border-radius:18px}}@media(max-width:640px){.container{padding:20px}.flashcard-container{height:300px}.card-face{font-size:1.2rem;padding:20px}.controls{grid-template-columns:1fr}}@media(max-width:480px){header{flex-direction:column;gap:12px;text-align:center}.nav-controls{flex-direction:column;gap:.75rem}.btn{width:100%}}.daily-review-btn{background:linear-gradient(135deg,#f093fb,#f5576c);color:#fff;font-weight:600;padding:14px 28px;border-radius:var(--radius-md);box-shadow:0 4px 15px #f093fb66;border:none;font-size:1.05rem;transition:all .3s ease}.daily-review-btn:hover{transform:translateY(-3px) scale(1.02);box-shadow:0 8px 25px #f093fb80}.modal-overlay{position:fixed;inset:0;background:#0009;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;z-index:1000;animation:fadeIn .2s ease}.daily-review-modal{background:#fff;border-radius:var(--radius-lg);width:90%;max-width:520px;max-height:85vh;overflow:hidden;box-shadow:0 25px 50px #00000040;animation:slideUp .3s ease}@keyframes slideUp{0%{opacity:0;transform:translateY(30px) scale(.95)}to{opacity:1;transform:translateY(0) scale(1)}}.modal-header{display:flex;justify-content:space-between;align-items:center;padding:20px 24px;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff}.modal-header 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24px}.daily-review-start-btn:disabled{opacity:.5;cursor:not-allowed;transform:none!important}@media(max-width:640px){.daily-review-modal{width:95%;max-height:90vh}.modal-body{padding:16px}.tag-chip{padding:6px 12px}.tag-name{max-width:80px}}.landing-page{width:100%;overflow-x:hidden}.hero{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--violet) 0%,var(--indigo) 100%);padding:2rem;text-align:center}.hero-content{max-width:800px}.hero-title{font-size:clamp(2.5rem,6vw,4rem);font-weight:700;margin-bottom:1.5rem;color:#fff;text-shadow:0 4px 20px rgba(0,0,0,.2)}.hero-subtitle{font-size:clamp(1.1rem,2vw,1.5rem);margin-bottom:3rem;color:#ffffffe6;line-height:1.6}.cta-button{padding:1.25rem 3rem;font-size:1.2rem;font-weight:600;border:none;border-radius:50px;background:#fff;color:var(--violet);cursor:pointer;transition:all .3s ease;box-shadow:0 10px 30px #0003}.cta-button:hover{transform:translateY(-3px);box-shadow:0 15px 40px #0000004d}section{padding:5rem 2rem;max-width:1200px;margin:0 auto}.section-title{font-size:clamp(2rem,4vw,3rem);font-weight:700;text-align:center;margin-bottom:3rem;background:linear-gradient(135deg,var(--violet),var(--indigo));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:2rem}.feature-card{padding:2rem;background:var(--glass-bg);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:1px solid var(--glass-border);border-radius:20px;text-align:center;transition:all .3s ease}.feature-card:hover{transform:translateY(-5px);box-shadow:0 20px 40px #8b5cf633}.feature-icon{font-size:3rem;margin-bottom:1rem}.feature-card h3{font-size:1.5rem;margin-bottom:1rem;color:var(--violet)}.feature-card p{color:var(--text-muted);line-height:1.6}.coming-soon{font-style:italic;color:var(--indigo)}.testimonials{background:linear-gradient(to 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ease}.plan-button:hover:not(:disabled){background:var(--violet);color:#fff}.plan-button.primary{background:linear-gradient(135deg,var(--violet),var(--indigo));color:#fff;border:none}.plan-button:disabled{opacity:.5;cursor:not-allowed}.footer-cta{text-align:center;padding:5rem 2rem;background:linear-gradient(135deg,var(--violet) 0%,var(--indigo) 100%)}.footer-cta h2{font-size:clamp(2rem,4vw,3rem);color:#fff;margin-bottom:2rem}@media(max-width:768px){section{padding:3rem 1rem}.hero{min-height:80vh}.features-grid,.testimonials-grid{grid-template-columns:1fr}.pricing-card.featured{transform:scale(1)}.cta-button{padding:.8rem 2rem;font-size:1rem}.plan-button{padding:.8rem;font-size:1rem}}#root{max-width:1280px;margin:0 auto;padding:2rem;text-align:center}.logo{height:6em;padding:1.5em;will-change:filter;transition:filter .3s}.logo:hover{filter:drop-shadow(0 0 2em #646cffaa)}.logo.react:hover{filter:drop-shadow(0 0 2em #61dafbaa)}@keyframes logo-spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}@media(prefers-reduced-motion:no-preference){a:nth-of-type(2) .logo{animation:logo-spin infinite 20s linear}}.card{padding:2em}.read-the-docs{color:#888}