:root{--font-title:"Outfit", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-body:"Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--bg-app:#08090d;--bg-surface:#10121d;--bg-surface-hover:#161929;--bg-card:#121420b3;--bg-glass:#000000b3;--border-color:#ffffff14;--border-color-active:#ffffff29;--color-primary:#8b5cf6;--color-primary-glow:#8b5cf640;--color-secondary:#06b6d4;--color-secondary-glow:#06b6d440;--color-again:#f43f5e;--color-again-glow:#f43f5e33;--color-hard:#f59e0b;--color-hard-glow:#f59e0b33;--color-good:#10b981;--color-good-glow:#10b98133;--color-easy:#3b82f6;--color-easy-glow:#3b82f633;--text-primary:#f8fafc;--text-secondary:#cbd5e1;--text-muted:#64748b;--text-primary-inverse:#0f172a;--backdrop-blur:16px;--shadow-sm:0 2px 8px #0000004d;--shadow-md:0 8px 24px #0006;--shadow-lg:0 16px 40px #00000080;--shadow-glow-primary:0 0 20px #8b5cf626;--shadow-glow-secondary:0 0 20px #06b6d426;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}*{box-sizing:border-box;margin:0;padding:0}html,body{overscroll-behavior:none}body{font-family:var(--font-body);background-color:var(--bg-app);color:var(--text-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background-image:radial-gradient(at 0 0,#8b5cf614 0,#0000 50%),radial-gradient(at 100% 100%,#06b6d414 0,#0000 50%);background-attachment:fixed;min-height:100vh;overflow-x:hidden}button,input,select,textarea{color:inherit;font-family:inherit}h1,h2,h3,h4,h5,h6{font-family:var(--font-title);letter-spacing:-.02em;font-weight:600}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:#ffffff26;border-radius:99px}::-webkit-scrollbar-thumb:hover{background:#ffffff4d}.app-container{max-width:800px;min-height:100vh;padding-top:calc(12px + env(safe-area-inset-top,0px));padding-bottom:calc(80px + env(safe-area-inset-bottom,0px));padding-left:calc(16px + env(safe-area-inset-left,0px));padding-right:calc(16px + env(safe-area-inset-right,0px));flex-direction:column;margin:0 auto;display:flex}@media (width>=768px){.app-container{padding-bottom:40px}}.glass-panel{background:var(--bg-glass);-webkit-backdrop-filter:blur(var(--backdrop-blur));border:1px solid var(--border-color);box-shadow:var(--shadow-md);border-radius:20px;transition:border-color .3s,box-shadow .3s}.glass-panel:hover{border-color:var(--border-color-active)}.app-header{border-bottom:1px solid var(--border-color);justify-content:space-between;align-items:center;margin-bottom:24px;padding:24px 0 16px;display:flex}.app-logo{color:var(--text-primary);align-items:center;gap:10px;text-decoration:none;display:flex}.app-logo img{width:36px;height:36px;filter:drop-shadow(0 0 8px var(--color-primary-glow))}.app-logo h1{background:linear-gradient(135deg, var(--text-primary) 30%, var(--color-secondary));-webkit-text-fill-color:transparent;-webkit-background-clip:text;font-size:1.5rem;font-weight:800}.nav-actions{align-items:center;gap:8px;display:flex}.tab-switcher{border:1px solid var(--border-color);background:#ffffff0a;border-radius:99px;gap:4px;margin-bottom:24px;padding:4px;display:flex;position:relative}.tab-btn{font-weight:600;font-family:var(--font-title);cursor:pointer;color:var(--text-secondary);background:0 0;border:none;border-radius:99px;flex:1;justify-content:center;align-items:center;gap:8px;padding:10px 16px;font-size:.95rem;transition:all .25s cubic-bezier(.4,0,.2,1);display:flex}.tab-btn:hover{color:var(--text-primary)}.tab-btn.active{color:var(--text-primary-inverse);background:linear-gradient(135deg, var(--text-primary), var(--text-secondary));box-shadow:var(--shadow-sm)}.btn{cursor:pointer;border:1px solid #0000;border-radius:12px;justify-content:center;align-items:center;gap:8px;padding:12px 20px;font-size:.95rem;font-weight:600;transition:all .2s cubic-bezier(.4,0,.2,1);display:inline-flex}.btn:active{transform:scale(.97)}.btn-primary{background:linear-gradient(135deg, var(--color-primary), #6d28d9);color:#fff;box-shadow:var(--shadow-glow-primary)}.btn-primary:hover{background:linear-gradient(135deg, #9f75ff, var(--color-primary));box-shadow:0 0 25px #8b5cf659}.btn-secondary{background:var(--bg-surface);border-color:var(--border-color);color:var(--text-primary)}.btn-secondary:hover{background:var(--bg-surface-hover);border-color:var(--border-color-active)}.btn-accent{background:linear-gradient(135deg, var(--color-secondary), #0891b2);color:#fff;box-shadow:var(--shadow-glow-secondary)}.btn-accent:hover{background:linear-gradient(135deg, #22d3ee, var(--color-secondary));box-shadow:0 0 25px #06b6d459}.btn-icon{background:var(--bg-surface);border:1px solid var(--border-color);cursor:pointer;border-radius:12px;justify-content:center;align-items:center;width:42px;height:42px;padding:0;transition:all .2s;display:flex}.btn-icon:hover{background:var(--bg-surface-hover);border-color:var(--border-color-active)}.modal-overlay{-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);z-index:1000;background:#050508d9;justify-content:center;align-items:center;padding:16px;animation:.25s cubic-bezier(.4,0,.2,1) fadeIn;display:flex;position:fixed;inset:0}.modal-content{background:var(--bg-surface);border:1px solid var(--border-color);width:100%;max-width:500px;max-height:85vh;box-shadow:var(--shadow-lg);border-radius:24px;padding:24px;animation:.3s cubic-bezier(.34,1.56,.64,1) slideUp;position:relative;overflow-y:auto}.form-group{margin-bottom:20px}.form-label{color:var(--text-secondary);text-transform:uppercase;letter-spacing:.05em;margin-bottom:8px;font-size:.85rem;font-weight:600;display:block}.form-control{border:1px solid var(--border-color);width:100%;color:var(--text-primary);background:#ffffff0a;border-radius:12px;padding:12px;font-size:.95rem;transition:all .2s}.form-control:focus{border-color:var(--color-primary);background:#ffffff12;outline:none;box-shadow:0 0 10px #8b5cf626}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes cardFlip{0%{transform:rotateY(0)}to{transform:rotateY(180deg)}}@keyframes pulseBorder{0%{border-color:#8b5cf633}50%{border-color:#8b5cf699}to{border-color:#8b5cf633}}.card-wrapper{perspective:1000px;width:100%;margin:16px 0}.flashcard-3d{background:var(--bg-card);width:100%;-webkit-backdrop-filter:blur(var(--backdrop-blur));border:1px solid var(--border-color);box-shadow:var(--shadow-lg);border-radius:28px;flex-direction:column;justify-content:space-between;min-height:380px;padding:32px 24px;transition:border-color .3s,box-shadow .3s;display:flex;position:relative}@media (width>=640px){.flashcard-3d{padding:40px 32px}}.flashcard-3d.studying{border-color:#06b6d44d}.flashcard-3d.showing-answer{border-color:#8b5cf64d}.card-header{color:var(--text-muted);justify-content:space-between;align-items:center;margin-bottom:24px;font-size:.85rem;display:flex}.card-type-badge{text-transform:uppercase;letter-spacing:.05em;color:var(--text-secondary);background:#ffffff0d;border-radius:99px;padding:4px 10px;font-size:.75rem;font-weight:600}.card-tags{flex-wrap:wrap;gap:6px;display:flex}.card-tag{color:var(--color-secondary);background:#06b6d41a;border-radius:6px;padding:2px 8px;font-size:.75rem;font-weight:500}.card-body{text-align:center;flex-direction:column;flex:1;justify-content:center;margin-bottom:24px;display:flex}.card-question{font-family:var(--font-title);color:var(--text-primary);font-size:1.35rem;font-weight:500;line-height:1.4}@media (width>=640px){.card-question{font-size:1.55rem}}.card-answer-separator{background:linear-gradient(90deg, transparent, var(--border-color), transparent);height:1px;margin:24px 0}.card-answer{color:var(--text-secondary);font-size:1.05rem;line-height:1.6}.dropzone{text-align:center;cursor:pointer;background:#ffffff03;border:2px dashed #ffffff26;border-radius:16px;flex-direction:column;justify-content:center;align-items:center;gap:12px;padding:32px 16px;transition:all .25s;display:flex}.dropzone:hover,.dropzone.active{border-color:var(--color-secondary);background:#06b6d40d}.dropzone-icon{color:var(--text-muted);transition:color .25s}.dropzone:hover .dropzone-icon,.dropzone.active .dropzone-icon{color:var(--color-secondary)}.cloze-blank{border-bottom:2px solid var(--color-secondary);color:var(--color-secondary);background:linear-gradient(120deg,#06b6d426,#3b82f626);border-radius:4px;padding:0 4px;font-weight:600}.cloze-revealed{border-bottom:2px solid var(--color-good);color:var(--color-good);background:#10b98126;border-radius:4px;padding:0 4px;font-weight:600}.stats-grid{grid-template-columns:repeat(2,1fr);gap:12px;margin-bottom:24px;display:grid}@media (width>=480px){.stats-grid{grid-template-columns:repeat(4,1fr)}}.stat-box{text-align:center;padding:16px 12px}.stat-value{font-family:var(--font-title);margin-bottom:4px;font-size:1.6rem;font-weight:800}.stat-label{color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em;font-size:.75rem;font-weight:600}.deck-grid{grid-template-columns:1fr;gap:16px;display:grid}@media (width>=640px){.deck-grid{grid-template-columns:repeat(2,1fr)}}.deck-card{cursor:pointer;flex-direction:column;justify-content:space-between;min-height:160px;padding:24px;display:flex}.deck-title{margin-bottom:8px;font-size:1.2rem;line-height:1.3}.deck-stats{justify-content:space-between;align-items:center;margin-top:16px;display:flex}.pills-container{gap:6px;display:flex}.pill{border-radius:99px;padding:2px 8px;font-size:.75rem;font-weight:600}.pill-due{background:var(--color-again-glow);color:var(--color-again);border:1px solid #f43f5e4d}.pill-total{color:var(--text-secondary);border:1px solid var(--border-color);background:#ffffff0d}