@import"https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;600;800&family=Quicksand:wght@400;600;700&display=swap";:root{--primary: #2ECC71;--primary-dark: #27AE60;--secondary: #3498DB;--secondary-dark: #2980B9;--accent: #F1C40F;--accent-glow: rgba(241, 196, 15, .4);--bg-main: #f8fafc;--bg-dark: #1e293b;--text-main: #334155;--text-muted: #64748b;--text-white: #ffffff;--glass-bg: rgba(255, 255, 255, .7);--glass-border: rgba(255, 255, 255, .3);--glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, .1);--font-heading: "Outfit", sans-serif;--font-body: "Quicksand", sans-serif;--radius-sm: 8px;--radius-md: 16px;--radius-lg: 24px;--radius-full: 9999px;--transition: all .3s cubic-bezier(.4, 0, .2, 1)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:var(--font-body);background-color:var(--bg-main);color:var(--text-main);line-height:1.6;overflow-x:hidden;-webkit-font-smoothing:antialiased}.container{max-width:1200px;margin:0 auto;padding:0 1.5rem}@keyframes fadeIn{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes float{0%{transform:translateY(0)}50%{transform:translateY(-10px)}to{transform:translateY(0)}}.glass{background:var(--glass-bg);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid var(--glass-border);box-shadow:var(--glass-shadow)}.main-header{background:linear-gradient(135deg,var(--primary) 0%,var(--secondary) 100%);padding:1.5rem 0;position:sticky;top:0;z-index:100;box-shadow:0 4px 20px #0000001a}.header-content{display:flex;justify-content:space-between;align-items:center}.logo{display:flex;align-items:center;gap:.75rem;text-decoration:none;color:var(--text-white)}.logo-icon{font-size:2rem;animation:float 3s ease-in-out infinite}.logo h1{font-family:var(--font-heading);font-size:1.5rem;font-weight:800;letter-spacing:-.5px}.nav-links{display:flex;gap:2rem;list-style:none}.nav-links a{color:#ffffffd9;text-decoration:none;font-weight:600;font-size:.95rem;transition:var(--transition)}.nav-links a:hover{color:var(--text-white);transform:translateY(-2px)}.hero{padding:6rem 0;background:radial-gradient(circle at top right,rgba(46,204,113,.1),transparent),radial-gradient(circle at bottom left,rgba(52,152,219,.1),transparent);text-align:center;animation:fadeIn .8s ease-out}.badge{background:var(--accent);color:var(--bg-dark);padding:6px 16px;border-radius:var(--radius-full);font-weight:800;font-size:.85rem;text-transform:uppercase;letter-spacing:.5px;margin-bottom:1.5rem;display:inline-block;box-shadow:0 4px 12px var(--accent-glow)}.hero h2{font-family:var(--font-heading);font-size:3.5rem;font-weight:800;color:var(--bg-dark);line-height:1.1;margin-bottom:1.5rem}.hero p{font-size:1.25rem;color:var(--text-muted);max-width:700px;margin:0 auto 2.5rem}.lessons-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:2.5rem;padding:2rem 0;animation:fadeIn 1s ease-out}.lesson-card{background:var(--text-white);border-radius:var(--radius-lg);overflow:hidden;text-decoration:none;color:inherit;transition:var(--transition);display:flex;flex-direction:column;border:1px solid rgba(0,0,0,.05);position:relative;top:0}.lesson-card:hover:not(.disabled){top:-10px;box-shadow:0 20px 40px #0000001a;border-color:var(--secondary)}.card-image{height:160px;background-size:cover;background-position:center;position:relative}.card-image:after{content:"";position:absolute;bottom:0;left:0;right:0;height:50%;background:linear-gradient(to top,rgba(0,0,0,.4),transparent)}.card-icon-overlay{position:absolute;top:1rem;left:1rem;width:40px;height:40px;background:var(--text-white);border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;font-size:1.25rem;box-shadow:0 4px 10px #0000001a;z-index:2}.card-content{padding:1.5rem;text-align:left}.card-content h3{font-family:var(--font-heading);font-size:1.5rem;color:var(--bg-dark);margin-bottom:.5rem}.card-content p{color:var(--text-muted);font-size:.95rem;margin-bottom:1.5rem}.card-footer{padding:1rem 1.5rem;background:#f8fafc;border-top:1px solid #edf2f7;display:flex;justify-content:space-between;align-items:center}.status-tag{font-size:.75rem;font-weight:700;text-transform:uppercase;padding:4px 8px;border-radius:var(--radius-full)}.status-available{background:#dcfce7;color:#166534}.btn-primary{background:var(--secondary);color:var(--text-white);padding:.75rem 1.5rem;border-radius:var(--radius-md);font-weight:700;text-decoration:none;transition:var(--transition);border:none;cursor:pointer;box-shadow:0 4px 12px #3498db4d}.btn-primary:hover{background:var(--secondary-dark);box-shadow:0 6px 16px #3498db66;transform:scale(1.02)}.lesson-view{padding:3rem 0}.content-section{background:var(--text-white);padding:3rem;border-radius:var(--radius-lg);margin-bottom:3rem;box-shadow:0 4px 20px #00000008;border:1px solid #edf2f7}.content-section h2{font-family:var(--font-heading);color:var(--primary-dark);font-size:2.25rem;margin-bottom:2rem;position:relative}.content-section h2:after{content:"";position:absolute;bottom:-8px;left:0;width:60px;height:4px;background:var(--accent);border-radius:2px}.content-section p{font-size:1.15rem;color:var(--text-main);margin-bottom:1.5rem}.quiz-section{background:var(--bg-dark);color:var(--text-white);padding:4rem;border-radius:var(--radius-lg);box-shadow:0 20px 40px #0003}.quiz-btn{background:#ffffff0d;border:1px solid rgba(255,255,255,.1);color:var(--text-white);padding:1.25rem;border-radius:var(--radius-md);transition:var(--transition);text-align:left;font-size:1.1rem}.quiz-btn:hover:not(:disabled){background:#ffffff26}.quiz-btn.correct{background:var(--primary)}.quiz-btn.incorrect{background:#e74c3c}@media (max-width: 768px){.hero h2{font-size:2.5rem}.nav-links{display:none}.content-section{padding:2rem}}.summary-table{width:100%;border-collapse:collapse;margin:1.5rem 0;font-size:.95rem;background-color:var(--card-bg);border-radius:var(--radius-md);overflow:hidden;box-shadow:var(--shadow-sm)}.summary-table th{background-color:var(--primary);color:#fff;text-align:left;padding:1rem;font-weight:600}.summary-table td{padding:1rem;border-bottom:1px solid var(--border);color:var(--text-color)}.summary-table tbody tr:last-child td{border-bottom:none}.summary-table tbody tr:hover{background-color:rgba(var(--primary-rgb),.05)}.auth-page{min-height:80vh;display:flex;align-items:center;justify-content:center;padding:3rem 1.5rem;background:radial-gradient(circle at top right,rgba(46,204,113,.08),transparent),radial-gradient(circle at bottom left,rgba(52,152,219,.08),transparent);animation:fadeIn .5s ease-out}.auth-card{background:var(--text-white);border-radius:var(--radius-lg);padding:3rem;width:100%;max-width:480px;box-shadow:0 20px 60px #0000001a;border:1px solid rgba(0,0,0,.05)}.auth-header{text-align:center;margin-bottom:2.5rem}.auth-icon{font-size:3.5rem;margin-bottom:1rem;animation:float 3s ease-in-out infinite}.auth-header h1{font-family:var(--font-heading);font-size:2rem;font-weight:800;color:var(--bg-dark);margin-bottom:.5rem}.auth-header p{color:var(--text-muted);font-size:1rem}.auth-form{display:flex;flex-direction:column;gap:1.5rem}.form-group{display:flex;flex-direction:column;gap:.5rem}.form-group label{font-weight:700;font-size:.9rem;color:var(--text-main)}.form-group input{padding:.85rem 1.1rem;border:2px solid #e2e8f0;border-radius:var(--radius-md);font-family:var(--font-body);font-size:1rem;color:var(--text-main);transition:var(--transition);background:#f8fafc}.form-group input:focus{outline:none;border-color:var(--secondary);background:#fff;box-shadow:0 0 0 3px #3498db26}.auth-error{background:#fef2f2;border:1px solid #fecaca;color:#dc2626;padding:.85rem 1rem;border-radius:var(--radius-md);font-size:.9rem;font-weight:600}.auth-btn{background:linear-gradient(135deg,var(--primary) 0%,var(--secondary) 100%);color:#fff;border:none;padding:1rem;border-radius:var(--radius-md);font-family:var(--font-heading);font-size:1.1rem;font-weight:700;cursor:pointer;transition:var(--transition);box-shadow:0 4px 15px #2ecc714d}.auth-btn:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 8px 25px #2ecc7166}.auth-btn:disabled{opacity:.6;cursor:not-allowed}.auth-footer{text-align:center;margin-top:1.5rem;color:var(--text-muted);font-size:.95rem}.auth-footer a{color:var(--secondary);font-weight:700;text-decoration:none}.auth-footer a:hover{text-decoration:underline}.nav-register-btn{background:#fff3!important;border-radius:var(--radius-full)!important;padding:.4rem 1rem!important;border:1px solid rgba(255,255,255,.5)!important;color:#fff!important;transition:var(--transition)!important}.nav-register-btn:hover{background:#ffffff59!important}.nav-nickname{color:var(--accent);font-weight:700;font-size:.95rem}.nav-logout-btn{background:transparent;border:1px solid rgba(255,255,255,.5);color:#ffffffd9;padding:.35rem .9rem;border-radius:var(--radius-full);font-family:var(--font-body);font-size:.9rem;font-weight:600;cursor:pointer;transition:var(--transition)}.nav-logout-btn:hover{background:#ffffff26;color:#fff}.nickname-mode-toggle{display:flex;gap:.75rem;margin-bottom:1.5rem}.mode-btn{flex:1;padding:.65rem 1rem;border:2px solid #e2e8f0;border-radius:var(--radius-md);background:#f8fafc;font-family:var(--font-body);font-size:.95rem;font-weight:600;color:var(--text-muted);cursor:pointer;transition:var(--transition)}.mode-btn.active{border-color:var(--secondary);background:#3498db14;color:var(--secondary-dark)}.mode-btn:hover:not(.active){border-color:#cbd5e1;background:#fff}.nickname-list-section{margin-bottom:1rem}.nickname-loading{text-align:center;color:var(--text-muted);font-size:.95rem;padding:2rem 0;font-style:italic}.nickname-instruction{text-align:center;color:var(--text-muted);font-size:1rem;font-weight:600;margin-bottom:1.25rem;background:#2ecc710d;padding:.75rem;border-radius:var(--radius-md);border:1px dashed rgba(46,204,113,.3)}.nickname-grid{display:flex;flex-wrap:wrap;gap:.5rem;max-height:260px;overflow-y:auto;padding:.5rem;border:1px solid #e2e8f0;border-radius:var(--radius-md);background:#f8fafc;scrollbar-width:thin;scrollbar-color:var(--secondary) transparent}.nickname-chip{padding:.4rem .9rem;border-radius:var(--radius-full);border:2px solid #e2e8f0;background:#fff;font-family:var(--font-body);font-size:.85rem;font-weight:600;color:var(--text-main);cursor:pointer;transition:var(--transition);white-space:nowrap}.nickname-chip:hover{border-color:var(--secondary);color:var(--secondary-dark);transform:translateY(-1px)}.nickname-chip.selected{background:linear-gradient(135deg,var(--primary),var(--secondary));border-color:transparent;color:#fff;box-shadow:0 4px 12px #2ecc7159}.no-results{color:var(--text-muted);font-size:.9rem;padding:.75rem;text-align:center;width:100%}.nickname-preview{background:linear-gradient(135deg,#2ecc711a,#3498db1a);border:1px solid rgba(46,204,113,.3);border-radius:var(--radius-md);padding:.75rem 1rem;font-size:.95rem;color:var(--text-main);margin-top:.75rem;margin-bottom:.5rem;text-align:center}.auth-back-btn{background:transparent;border:none;color:var(--text-muted);font-family:var(--font-body);font-size:.9rem;font-weight:600;cursor:pointer;padding:.5rem;text-align:center;transition:var(--transition)}.auth-back-btn:hover{color:var(--secondary)}