:root{font-family:system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:light dark;color:#ffffffde;background-color:#242424;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a{font-weight:500;color:#646cff;text-decoration:inherit}a:hover{color:#535bf2}body{margin:0;display:flex;place-items:center;min-width:320px;min-height:100vh}h1{font-size:3.2em;line-height:1.1}button{border-radius:8px;border:1px solid transparent;padding:.6em 1.2em;font-size:1em;font-weight:500;font-family:inherit;background-color:#1a1a1a;cursor:pointer;transition:border-color .25s}button:hover{border-color:#646cff}button:focus,button:focus-visible{outline:4px auto -webkit-focus-ring-color}@media (prefers-color-scheme: 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#667eea4d}.elegant-btn:hover{transform:translateY(-2px);box-shadow:0 8px 25px #667eea66;background:linear-gradient(135deg,#5a6fd8,#6a4c93)}.outline-btn{border:2px solid #667eea;color:#667eea;background:transparent;border-radius:12px;font-weight:600;padding:12px 32px;font-size:1rem;transition:all .3s ease;text-transform:none}.outline-btn:hover{background:#667eea;color:#fff;transform:translateY(-2px);box-shadow:0 8px 25px #667eea4d}.nav-avatar{transition:all .3s ease}.nav-avatar:hover{transform:scale(1.1);box-shadow:0 4px 12px #ffffff4d}.benefits-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:2rem;padding:2rem 0}.benefit-icon{transition:all .3s ease}.feature-card:hover .benefit-icon{transform:scale(1.2) rotate(5deg)}.dashboard-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:2rem;margin:2rem 0}.loading-shimmer{background:linear-gradient(90deg,#f0f0f0 25%,#e0e0e0,#f0f0f0 75%);background-size:200% 100%;animation:shimmer 1.5s infinite}@keyframes shimmer{0%{background-position:-200% 0}to{background-position:200% 0}}@media (max-width: 768px){.hero-title{font-size:2.5rem!important}.hero-subtitle{font-size:1.2rem!important;padding:0 1rem}.benefits-grid{grid-template-columns:1fr;gap:1.5rem}.dashboard-grid{grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1.5rem}}@media (max-width: 480px){.hero-title{font-size:2rem!important}.elegant-btn,.outline-btn{padding:10px 24px;font-size:.9rem}}.permission-card{transition:all .3s cubic-bezier(.4,0,.2,1);border:1px solid rgba(0,0,0,.1);background:#ffffffe6;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.permission-card:hover{transform:translateY(-4px);box-shadow:0 12px 30px #00000026;border-color:#667eea4d}.join-code-display{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;padding:1.5rem;border-radius:16px;text-align:center;font-family:SF Mono,Monaco,Inconsolata,Roboto Mono,monospace;letter-spacing:3px;font-size:1.8rem;font-weight:700;margin:1.5rem 0;box-shadow:0 8px 25px #667eea4d;position:relative;overflow:hidden}.join-code-display:before{content:"";position:absolute;top:-50%;left:-50%;width:200%;height:200%;background:linear-gradient(45deg,transparent,rgba(255,255,255,.1),transparent);animation:shine 2s infinite}@keyframes shine{0%{transform:rotate(45deg) translate(-100%,-100%)}50%{transform:rotate(45deg) translate(100%,100%)}to{transform:rotate(45deg) translate(100%,100%)}}.flashcard-set-card{transition:all .3s cubic-bezier(.4,0,.2,1);border:2px solid transparent;background:#ffffffe6;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.flashcard-set-card:hover{transform:translateY(-6px) scale(1.02);box-shadow:0 20px 40px #00000026;border-color:#1976d2}.visibility-chip{font-weight:600;text-transform:uppercase;font-size:.75rem;background:#1976d21a;color:#1976d2;border:1px solid rgba(25,118,210,.3)}.privacy-option-card{cursor:pointer;transition:all .3s ease;border:2px solid transparent;background:#fffc;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.privacy-option-card:hover{border-color:#1976d2;background:#e3f2fdcc;transform:translateY(-2px)}.privacy-option-card.selected{border-color:#1976d2;background:#e3f2fde6;box-shadow:0 4px 12px #1976d233}.MuiTabPanel-root{padding-top:1.5rem!important;background:#ffffff80;border-radius:0 0 16px 16px;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.MuiTabs-root{background:#ffffffe6;border-radius:16px 16px 0 0;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.MuiButton-root:focus-visible{outline:3px solid #667eea;outline-offset:2px}.MuiCard-root:focus-within{outline:2px solid #667eea;outline-offset:4px}html{scroll-behavior:smooth}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:#0000001a;border-radius:4px}::-webkit-scrollbar-thumb{background:linear-gradient(135deg,#667eea,#764ba2);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:linear-gradient(135deg,#5a6fd8,#6a4c93)}@media print{.MuiAppBar-root,.MuiButton-root{display:none!important}body{background:#fff!important}}@media (prefers-color-scheme: dark){body{background:linear-gradient(135deg,#1a202c,#2d3748);color:#f7fafc}.feature-card,.dashboard-card,.permission-card,.flashcard-set-card{background:#2d3748e6;color:#f7fafc}}.loader-overlay{position:fixed;inset:0;background:#ffffffb3;display:flex;align-items:center;justify-content:center;z-index:9999}.loader{border:8px solid #f3f3f3;border-top:8px solid #3498db;border-radius:50%;width:60px;height:60px;animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}