@import"https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=Inter:wght@300;400;500;600&display=swap";:root{--bg-deep: #060a14;--bg-primary: #0a0e1a;--bg-card: #111827;--bg-card-hover: #1a2332;--bg-surface: #151d2e;--bg-glass: rgba(17, 24, 39, .7);--text-primary: #f0f4f8;--text-secondary: #94a3b8;--text-muted: #64748b;--accent: #00d4aa;--accent-glow: rgba(0, 212, 170, .15);--accent-blue: #0ea5e9;--accent-purple: #8b5cf6;--fail: #ef4444;--fail-glow: rgba(239, 68, 68, .2);--hard: #f59e0b;--hard-glow: rgba(245, 158, 11, .2);--normal: #3b82f6;--normal-glow: rgba(59, 130, 246, .2);--easy: #10b981;--easy-glow: rgba(16, 185, 129, .2);--border: rgba(148, 163, 184, .08);--border-accent: rgba(0, 212, 170, .25);--radius: 16px;--radius-sm: 10px;--radius-xs: 6px;--shadow: 0 4px 24px rgba(0,0,0,.3);--shadow-glow: 0 0 30px rgba(0, 212, 170, .08);--transition: cubic-bezier(.4, 0, .2, 1)}*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth}body{font-family:Inter,system-ui,sans-serif;background:var(--bg-deep);color:var(--text-primary);min-height:100vh;overflow-x:hidden;-webkit-font-smoothing:antialiased}body:before{content:"";position:fixed;top:-50%;left:-50%;width:200%;height:200%;background:radial-gradient(ellipse at 30% 20%,rgba(0,212,170,.04) 0%,transparent 50%),radial-gradient(ellipse at 70% 80%,rgba(14,165,233,.03) 0%,transparent 50%),radial-gradient(ellipse at 50% 50%,rgba(139,92,246,.02) 0%,transparent 50%);z-index:0;pointer-events:none}#app{position:relative;z-index:1;min-height:100vh}h1,h2,h3,h4{font-family:Space Grotesk,sans-serif;letter-spacing:-.02em}.navbar{position:sticky;top:0;z-index:100;display:flex;align-items:center;justify-content:space-between;padding:0 24px;height:64px;background:#060a14d9;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border-bottom:1px solid var(--border)}.navbar-brand{display:flex;align-items:center;gap:10px;font-family:Space Grotesk,sans-serif;font-weight:700;font-size:1.35rem;color:var(--text-primary);cursor:pointer;text-decoration:none}.navbar-brand .logo-dot{width:10px;height:10px;background:var(--accent);border-radius:50%;box-shadow:0 0 12px var(--accent);animation:pulse-dot 2s ease-in-out infinite}@keyframes pulse-dot{0%,to{box-shadow:0 0 12px var(--accent)}50%{box-shadow:0 0 24px var(--accent),0 0 48px #00d4aa4d}}.navbar-user{display:flex;align-items:center;gap:12px}.navbar-user span{font-size:.85rem;color:var(--text-secondary)}.navbar-user .user-avatar{width:34px;height:34px;border-radius:50%;background:linear-gradient(135deg,var(--accent),var(--accent-blue));display:flex;align-items:center;justify-content:center;font-weight:600;font-size:.8rem;color:var(--bg-deep)}.btn-logout{background:none;border:1px solid var(--border);color:var(--text-muted);padding:6px 14px;border-radius:var(--radius-xs);cursor:pointer;font-size:.8rem;transition:all .2s var(--transition)}.btn-logout:hover{border-color:var(--fail);color:var(--fail)}.breadcrumb{display:flex;align-items:center;gap:8px;padding:16px 24px;font-size:.85rem;color:var(--text-muted)}.breadcrumb a{color:var(--text-secondary);text-decoration:none;cursor:pointer;transition:color .2s}.breadcrumb a:hover{color:var(--accent)}.breadcrumb .sep{opacity:.3}.breadcrumb .current{color:var(--text-primary);font-weight:500}.page{max-width:1100px;margin:0 auto;padding:20px 24px 60px;animation:fadeInUp .5s var(--transition) both}@keyframes fadeInUp{0%{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}.page-title{font-size:2rem;font-weight:700;margin-bottom:6px;background:linear-gradient(135deg,var(--text-primary) 0%,var(--accent) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.page-subtitle{color:var(--text-secondary);font-size:.95rem;margin-bottom:32px}.topics-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:18px}.topic-card{position:relative;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:28px 24px;cursor:pointer;transition:all .35s var(--transition);overflow:hidden}.topic-card:before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:var(--card-color, var(--accent));opacity:0;transition:opacity .35s var(--transition)}.topic-card:hover{border-color:#94a3b826;transform:translateY(-4px);box-shadow:var(--shadow),0 0 40px #00000026}.topic-card:hover:before{opacity:1}.topic-card .topic-icon{font-size:2.2rem;margin-bottom:14px;display:block}.topic-card .topic-name{font-family:Space Grotesk,sans-serif;font-size:1.15rem;font-weight:600;margin-bottom:4px}.topic-card .topic-desc{font-size:.82rem;color:var(--text-muted);margin-bottom:16px}.topic-card .topic-progress{display:flex;align-items:center;gap:10px;font-size:.78rem;color:var(--text-secondary)}.progress-bar{flex:1;height:4px;background:#94a3b81a;border-radius:2px;overflow:hidden}.progress-bar-fill{height:100%;background:linear-gradient(90deg,var(--accent),var(--accent-blue));border-radius:2px;transition:width .6s var(--transition)}.decks-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px}.deck-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:24px;cursor:pointer;transition:all .3s var(--transition);display:flex;flex-direction:column;gap:12px}.deck-card:hover{border-color:var(--border-accent);transform:translateY(-3px);box-shadow:var(--shadow-glow)}.deck-card .deck-header{display:flex;align-items:center;gap:12px}.deck-card .deck-icon{font-size:1.6rem}.deck-card .deck-name{font-family:Space Grotesk,sans-serif;font-size:1.05rem;font-weight:600}.deck-card .deck-stats{display:flex;gap:16px;font-size:.78rem;color:var(--text-muted)}.deck-card .deck-stats .stat-val{color:var(--accent);font-weight:600}.deck-card.review-deck{border:1px solid rgba(139,92,246,.25);background:linear-gradient(135deg,#8b5cf60f,#0ea5e90a)}.deck-card.review-deck:hover{border-color:#8b5cf673;box-shadow:0 0 30px #8b5cf61a}.study-container{max-width:680px;margin:0 auto}.study-progress{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px;font-size:.85rem;color:var(--text-secondary)}.study-progress-bar{flex:1;height:4px;background:#94a3b81a;border-radius:2px;margin:0 16px;overflow:hidden}.study-progress-fill{height:100%;background:linear-gradient(90deg,var(--accent),var(--accent-blue));border-radius:2px;transition:width .4s var(--transition)}.flashcard-wrapper{perspective:1200px;margin-bottom:24px}.flashcard{position:relative;width:100%;min-height:320px;cursor:pointer;transform-style:preserve-3d;transition:transform .6s var(--transition)}.flashcard.flipped{transform:rotateY(180deg)}.flashcard-face{position:absolute;top:0;left:0;width:100%;min-height:320px;backface-visibility:hidden;border-radius:var(--radius);padding:40px 32px;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center}.flashcard-front{background:var(--bg-card);border:1px solid var(--border-accent);box-shadow:var(--shadow-glow)}.flashcard-back{transform:rotateY(180deg);background:linear-gradient(135deg,var(--bg-card) 0%,rgba(0,212,170,.04) 100%);border:1px solid rgba(0,212,170,.2)}.flashcard-label{font-size:.7rem;text-transform:uppercase;letter-spacing:.12em;color:var(--accent);margin-bottom:20px;font-weight:600}.flashcard-text{font-size:1.1rem;line-height:1.7;color:var(--text-primary);font-weight:400}.flashcard-front .flashcard-text{font-weight:500}.flashcard-hint{margin-top:24px;font-size:.75rem;color:var(--text-muted);display:flex;align-items:center;gap:6px}.flashcard.flipped .flashcard-hint{display:none}.rating-buttons{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;opacity:0;transform:translateY(10px);transition:all .4s var(--transition);pointer-events:none}.rating-buttons.visible{opacity:1;transform:translateY(0);pointer-events:auto}.rating-btn{padding:14px 8px;border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--bg-card);cursor:pointer;transition:all .25s var(--transition);display:flex;flex-direction:column;align-items:center;gap:6px}.rating-btn .rating-label{font-size:.78rem;font-weight:600;font-family:Space Grotesk,sans-serif}.rating-btn .rating-interval{font-size:.65rem;color:var(--text-muted)}.rating-btn.fail{border-color:#ef444433}.rating-btn.fail:hover{background:var(--fail-glow);border-color:var(--fail)}.rating-btn.fail .rating-label{color:var(--fail)}.rating-btn.hard{border-color:#f59e0b33}.rating-btn.hard:hover{background:var(--hard-glow);border-color:var(--hard)}.rating-btn.hard .rating-label{color:var(--hard)}.rating-btn.normal{border-color:#3b82f633}.rating-btn.normal:hover{background:var(--normal-glow);border-color:var(--normal)}.rating-btn.normal .rating-label{color:var(--normal)}.rating-btn.easy{border-color:#10b98133}.rating-btn.easy:hover{background:var(--easy-glow);border-color:var(--easy)}.rating-btn.easy .rating-label{color:var(--easy)}.auth-wrapper{display:flex;align-items:center;justify-content:center;min-height:100vh;padding:24px}.auth-card{width:100%;max-width:420px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:48px 36px 40px;box-shadow:var(--shadow);animation:fadeInUp .6s var(--transition) both}.auth-logo{text-align:center;margin-bottom:32px}.auth-logo h1{font-family:Space Grotesk,sans-serif;font-size:2rem;font-weight:700;background:linear-gradient(135deg,var(--accent) 0%,var(--accent-blue) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.auth-logo p{color:var(--text-muted);font-size:.85rem;margin-top:6px}.auth-tabs{display:flex;margin-bottom:28px;border-bottom:1px solid var(--border)}.auth-tab{flex:1;padding:10px;text-align:center;cursor:pointer;font-size:.88rem;font-weight:500;color:var(--text-muted);border-bottom:2px solid transparent;transition:all .3s;background:none;border-top:none;border-left:none;border-right:none}.auth-tab.active{color:var(--accent);border-bottom-color:var(--accent)}.form-group{margin-bottom:18px}.form-group label{display:block;font-size:.8rem;color:var(--text-secondary);margin-bottom:6px;font-weight:500}.form-group input{width:100%;padding:12px 16px;background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius-xs);color:var(--text-primary);font-size:.92rem;font-family:inherit;transition:border-color .3s;outline:none}.form-group input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-glow)}.form-error{color:var(--fail);font-size:.8rem;margin-bottom:12px;min-height:20px}.btn-primary{width:100%;padding:13px;background:linear-gradient(135deg,var(--accent) 0%,#00b894 100%);border:none;border-radius:var(--radius-xs);color:var(--bg-deep);font-size:.95rem;font-weight:600;font-family:Space Grotesk,sans-serif;cursor:pointer;transition:all .3s var(--transition)}.btn-primary:hover{transform:translateY(-1px);box-shadow:0 6px 24px #00d4aa40}.summary-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:48px 36px;text-align:center;max-width:520px;margin:40px auto;animation:fadeInUp .5s var(--transition) both}.summary-card .summary-emoji{font-size:3.5rem;margin-bottom:16px}.summary-card h2{font-family:Space Grotesk,sans-serif;font-size:1.5rem;margin-bottom:8px}.summary-card p{color:var(--text-secondary);font-size:.9rem;margin-bottom:24px}.summary-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-bottom:28px}.summary-stat{padding:14px 8px;border-radius:var(--radius-sm);background:var(--bg-surface)}.summary-stat .stat-num{font-size:1.5rem;font-weight:700;font-family:Space Grotesk,sans-serif}.summary-stat .stat-label{font-size:.7rem;color:var(--text-muted);margin-top:2px}.summary-stat.fail .stat-num{color:var(--fail)}.summary-stat.hard .stat-num{color:var(--hard)}.summary-stat.normal .stat-num{color:var(--normal)}.summary-stat.easy .stat-num{color:var(--easy)}.btn-secondary{display:inline-block;padding:12px 28px;background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius-xs);color:var(--text-primary);font-size:.9rem;font-weight:500;cursor:pointer;transition:all .25s var(--transition);text-decoration:none;font-family:inherit}.btn-secondary:hover{border-color:var(--accent);color:var(--accent)}.empty-state{text-align:center;padding:60px 20px;color:var(--text-muted)}.empty-state .empty-icon{font-size:3rem;margin-bottom:16px;opacity:.5}.empty-state p{font-size:.95rem}.stagger-item{opacity:0;transform:translateY(12px);animation:fadeInUp .4s var(--transition) both}.stagger-item:nth-child(1){animation-delay:.05s}.stagger-item:nth-child(2){animation-delay:.1s}.stagger-item:nth-child(3){animation-delay:.15s}.stagger-item:nth-child(4){animation-delay:.2s}.stagger-item:nth-child(5){animation-delay:.25s}.stagger-item:nth-child(6){animation-delay:.3s}.stagger-item:nth-child(7){animation-delay:.35s}.stagger-item:nth-child(8){animation-delay:.4s}.particles-bg{position:fixed;top:0;left:0;width:100%;height:100%;z-index:0;pointer-events:none;overflow:hidden}.particle{position:absolute;width:2px;height:2px;background:var(--accent);border-radius:50%;opacity:0;animation:float-particle linear infinite}@keyframes float-particle{0%{opacity:0;transform:translateY(100vh) scale(0)}10%{opacity:.6}90%{opacity:.6}to{opacity:0;transform:translateY(-10vh) scale(1)}}@media(max-width:768px){.navbar{padding:0 16px}.page{padding:16px 16px 48px}.page-title{font-size:1.5rem}.topics-grid,.decks-grid{grid-template-columns:1fr}.rating-buttons,.summary-stats{grid-template-columns:repeat(2,1fr)}.auth-card{padding:36px 24px}.flashcard-face{padding:28px 20px;min-height:280px}.flashcard{min-height:280px}}