@import"https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap";:root{--apple-blue: #007AFF;--apple-gray: #8E8E93;--apple-light-gray: #F2F2F7;--apple-dark-gray: #1C1C1E;--apple-green: #34C759;--apple-orange: #FF9500;--apple-red: #FF3B30;--apple-purple: #AF52DE;--background-gradient: linear-gradient(135deg, #F2F2F7 0%, #FFFFFF 100%);--card-background: rgba(255, 255, 255, .8);--text-primary: #1C1C1E;--text-secondary: #8E8E93;--text-card: #1C1C1E;--text-white: #ffffff;--border-color: rgba(142, 142, 147, .2)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,SF Pro Display,Segoe UI,Roboto,sans-serif;background:var(--background-gradient);min-height:100vh;color:var(--text-primary);line-height:1.6;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;margin:0;padding:20px}.container{max-width:1200px;margin:0 auto;padding:0 24px}.header{background:var(--card-background);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border:1px solid var(--border-color);border-radius:16px;padding:32px;margin-bottom:24px;box-shadow:0 8px 32px #0000004d}.header-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.exam-title-section{display:flex;flex-direction:column;gap:12px}.back-to-exams-btn{background:#ffffff1a;border:1px solid rgba(255,255,255,.2);color:#64748b;padding:8px 16px;border-radius:8px;font-size:.875rem;font-weight:500;cursor:pointer;transition:all .3s ease;align-self:flex-start}.back-to-exams-btn:hover{background:#fff3;color:#475569}.header h1{color:var(--text-primary);margin:0;font-size:2.25rem;font-weight:700;display:flex;align-items:center;gap:12px}.exam-icon{font-size:2rem}.exam-info{display:flex;justify-content:space-between;align-items:center;color:#a1a1aa;font-weight:500;font-size:1.1rem}.exam-info span{display:flex;align-items:center;gap:8px}.exam-info span:before{content:"";width:8px;height:8px;border-radius:50%;background:linear-gradient(135deg,#6366f1,#8b5cf6)}.exam-container{background:var(--card-background);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border:1px solid var(--border-color);border-radius:16px;padding:40px;box-shadow:0 8px 32px #0000004d;position:relative;overflow:hidden}.exam-container:before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--apple-blue) 0%,var(--apple-purple) 50%,var(--apple-blue) 100%)}.question-section{margin-bottom:40px}.question-section h2{color:var(--text-primary);line-height:1.7;font-size:1.375rem;font-weight:600;margin-bottom:8px}.question-number{display:inline-block;background:linear-gradient(135deg,#6366f1,#8b5cf6);color:#fff;padding:6px 14px;border-radius:12px;font-size:.875rem;font-weight:600;margin-bottom:16px}.answers-section{margin-bottom:40px}.answer-option{margin-bottom:16px;border:1px solid rgba(255,255,255,.1);border-radius:12px;transition:all .3s cubic-bezier(.25,.46,.45,.94);cursor:pointer;background:#ffffff08;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);position:relative;overflow:hidden}.answer-option:before{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background:linear-gradient(135deg,transparent 0%,rgba(59,130,246,.05) 100%);opacity:0;transition:opacity .3s ease}.answer-option:hover{border-color:#6366f1;background-color:#6366f11a;transform:translateY(-2px);box-shadow:0 8px 25px #6366f133}.answer-option:hover:before{opacity:1}.answer-option.correct{border-color:#10b981;background:linear-gradient(135deg,#10b98126,#10b9810d);box-shadow:0 8px 25px #10b9814d}.answer-option.incorrect{border-color:#ef4444;background:linear-gradient(135deg,#ef444426,#ef44440d);box-shadow:0 8px 25px #ef44444d}.answer-option.selected{border-color:#6366f1;background:linear-gradient(135deg,#6366f126,#6366f10d);box-shadow:0 8px 25px #6366f14d}.answer-option label{display:flex;align-items:flex-start;padding:20px;cursor:pointer;width:100%;position:relative;z-index:1}.answer-option input[type=radio]{display:none}.option-letter{font-weight:600;margin-right:16px;min-width:32px;height:32px;border-radius:8px;background:linear-gradient(135deg,#6366f1,#8b5cf6);color:#fff;display:flex;align-items:center;justify-content:center;font-size:.875rem;flex-shrink:0}.answer-option.correct .option-letter{background:linear-gradient(135deg,#10b981,#059669)}.answer-option.incorrect .option-letter{background:linear-gradient(135deg,#ef4444,#dc2626)}.option-text{flex:1;font-size:1.0625rem;line-height:1.6;color:var(--text-primary)}.explanation-section{background:var(--card-background);border:1px solid var(--border-color);border-left:3px solid var(--apple-blue);padding:24px;margin-bottom:32px;border-radius:12px;position:relative;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.explanation-section:before{content:"Explanation";position:absolute;top:-12px;left:20px;background:linear-gradient(135deg,#6366f1,#8b5cf6);padding:6px 12px;border-radius:8px;font-size:.75rem;font-weight:600;color:#fff;text-transform:uppercase;letter-spacing:.5px}.explanation-section h3{color:var(--text-primary);margin-bottom:12px;font-size:1.25rem;font-weight:600;margin-top:8px}.explanation-section p{line-height:1.7;color:var(--text-secondary);font-size:1.0625rem}.controls{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}.btn{padding:14px 28px;border:none;border-radius:10px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .3s cubic-bezier(.25,.46,.45,.94);min-width:140px;position:relative;overflow:hidden;font-family:inherit}.btn:before{content:"";position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.1),transparent);transition:left .5s}.btn:hover:before{left:100%}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}.btn:disabled:before{display:none}.btn-primary{background:var(--apple-blue);color:#fff;box-shadow:0 4px 14px #007aff4d}.btn-primary:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 8px 25px #007aff66;background:#0056cc}.btn-secondary{background:transparent;border:1px solid var(--border-color);color:var(--text-secondary);box-shadow:0 4px 14px #0000001a}.btn-secondary:hover:not(:disabled){transform:translateY(-2px);background:var(--apple-light-gray);border-color:var(--apple-gray);color:var(--text-primary);box-shadow:0 8px 25px #00000026}.results-container{background:var(--card-background);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border:1px solid var(--border-color);border-radius:16px;padding:48px;text-align:center;box-shadow:0 8px 32px #0000004d;position:relative;overflow:hidden}.results-container:before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,#10b981,#6366f1,#8b5cf6)}.results-container h2{color:var(--text-primary);margin-bottom:40px;font-size:2.5rem;font-weight:700}.score-summary{display:flex;justify-content:center;align-items:center;gap:48px;margin-bottom:40px;flex-wrap:wrap}.score-circle{width:160px;height:160px;border-radius:50%;background:linear-gradient(135deg,#6366f1,#8b5cf6);display:flex;align-items:center;justify-content:center;color:#fff;font-size:2rem;font-weight:700;position:relative;box-shadow:0 20px 40px -10px #6366f166}.score-circle:before{content:"";position:absolute;top:-4px;right:-4px;bottom:-4px;left:-4px;border-radius:50%;background:linear-gradient(135deg,#1e40af,#3730a3,#1e3a8a);z-index:-1;animation:rotate 3s linear infinite}@keyframes rotate{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.score-details{text-align:left;background:#ffffff80;padding:24px;border-radius:16px;border:1px solid rgba(255,255,255,.3)}.score-details p{margin-bottom:12px;font-size:1.125rem;color:#475569;display:flex;justify-content:space-between;align-items:center}.score-details strong{color:#0f172a;font-weight:700}.progress-container{background:#fff3;border-radius:10px;height:8px;margin-top:16px;overflow:hidden}.progress-bar{height:100%;background:linear-gradient(90deg,#6366f1,#8b5cf6);border-radius:6px;transition:width .3s ease}.status-badge{display:inline-block;padding:6px 16px;border-radius:20px;font-size:.875rem;font-weight:600;margin-top:8px}.status-excellent{background:linear-gradient(135deg,#10b981,#059669);color:#fff}.status-good{background:linear-gradient(135deg,#f59e0b,#d97706);color:#fff}.status-study{background:linear-gradient(135deg,#ef4444,#dc2626);color:#fff}@media (max-width: 768px){body{padding:10px}.container{padding:0 16px}.header,.exam-container{padding:24px}.header h1{font-size:1.875rem}.exam-info{flex-direction:column;gap:8px;align-items:flex-start}.controls{flex-direction:column;align-items:center}.btn{width:100%;max-width:280px}.score-summary{flex-direction:column;gap:32px}.score-circle{width:140px;height:140px}.results-container{padding:32px 24px}.answer-option label{padding:16px}.option-letter{min-width:28px;height:28px;margin-right:12px}.header-top{flex-direction:column;gap:16px;align-items:flex-start}.header h1{font-size:1.5rem;text-align:center;width:100%}}.loading-container{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:60vh;text-align:center}.loading-spinner{position:relative;width:80px;height:80px;margin-bottom:24px}.spinner-ring{position:absolute;width:100%;height:100%;border:4px solid transparent;border-top:4px solid #3b82f6;border-radius:50%;animation:spin 1.5s linear infinite}.spinner-ring:nth-child(2){width:60px;height:60px;top:10px;left:10px;border-top-color:#8b5cf6;animation-duration:1.2s;animation-direction:reverse}.spinner-ring:nth-child(3){width:40px;height:40px;top:20px;left:20px;border-top-color:#ec4899;animation-duration:.9s}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.loading-text{color:#64748b;font-size:1.125rem;font-weight:500}.fade-in{animation:fadeIn .5s ease-in}@keyframes fadeIn{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}.floating{animation:float 3s ease-in-out infinite}.btn:focus,.answer-option:focus-within{outline:2px solid #1e40af;outline-offset:2px}::selection{background:#1e40af33;color:#0f172a}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:#ffffff1a;border-radius:4px}::-webkit-scrollbar-thumb{background:linear-gradient(135deg,#1e40af,#3730a3);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:linear-gradient(135deg,#1d4ed8,#4338ca)}.login-container{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px}.login-card{background:var(--card-background);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border:1px solid var(--border-color);border-radius:24px;padding:48px;max-width:480px;width:100%;box-shadow:0 25px 50px -12px #00000040;text-align:center;position:relative;overflow:hidden}.login-card:before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg,#3b82f6,#8b5cf6,#ec4899)}.login-header{margin-bottom:40px}.cloud-logo{margin-bottom:24px}.cloud-icon{font-size:4rem;display:block;margin-bottom:16px;animation:float 3s ease-in-out infinite}.login-header h1{color:#0f172a;font-size:2rem;font-weight:700;margin-bottom:8px;background:linear-gradient(135deg,#3b82f6,#8b5cf6);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.login-header h2{color:#475569;font-size:1.25rem;font-weight:600;margin-bottom:12px}.login-header p{color:#64748b;font-size:1rem;line-height:1.6}.login-benefits{display:flex;justify-content:space-around;margin-bottom:32px;padding:24px;background:#3b82f60d;border-radius:16px;border:1px solid rgba(59,130,246,.1)}.benefit-item{display:flex;flex-direction:column;align-items:center;gap:8px;font-size:.875rem;color:#475569;font-weight:500}.benefit-icon{font-size:1.5rem}.login-buttons{display:flex;flex-direction:column;gap:16px;margin-bottom:24px}.btn-google{background:#fff;color:#374151;border:2px solid #e5e7eb;display:flex;align-items:center;justify-content:center;gap:12px;font-weight:600;transition:all .3s ease}.btn-google:hover:not(:disabled){background:#f9fafb;border-color:#d1d5db;transform:translateY(-2px);box-shadow:0 8px 25px #0000001a}.google-icon{width:20px;height:20px}.divider{position:relative;text-align:center;margin:8px 0}.divider:before{content:"";position:absolute;top:50%;left:0;right:0;height:1px;background:#e2e8f0}.divider span{background:#fffffff2;padding:0 16px;color:#64748b;font-size:.875rem;position:relative}.error-message{background:#ef44441a;border:1px solid rgba(239,68,68,.2);color:#dc2626;padding:12px 16px;border-radius:8px;display:flex;align-items:center;gap:8px;font-size:.875rem;margin-top:16px}.error-icon{font-size:1rem}.login-footer{margin-top:32px;padding-top:24px;border-top:1px solid #e2e8f0}.login-footer p{color:#64748b;font-size:.875rem;line-height:1.6}.user-profile{position:relative}.profile-trigger{display:flex;align-items:center;gap:12px;padding:8px 16px;border-radius:12px;cursor:pointer;transition:all .3s ease;background:#ffffff1a;border:1px solid rgba(255,255,255,.2)}.profile-trigger:hover{background:#fff3}.profile-avatar{width:32px;height:32px;border-radius:50%;overflow:hidden;background:linear-gradient(135deg,#3b82f6,#8b5cf6);display:flex;align-items:center;justify-content:center}.profile-avatar img{width:100%;height:100%;object-fit:cover}.avatar-fallback{color:#fff;font-weight:600;font-size:.875rem}.profile-name{color:#64748b;font-weight:500;font-size:.875rem}.dropdown-arrow{color:#64748b;font-size:.75rem;transition:transform .3s ease}.profile-dropdown{position:absolute;top:100%;right:0;margin-top:8px;background:#fffffff2;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border:1px solid rgba(255,255,255,.2);border-radius:12px;box-shadow:0 10px 25px -5px #0003;min-width:200px;z-index:1000;overflow:hidden}.dropdown-header{padding:16px}.user-info strong{display:block;color:#0f172a;font-size:.875rem;margin-bottom:4px}.user-email{color:#64748b;font-size:.75rem}.dropdown-divider{height:1px;background:#e2e8f0;margin:0 16px}.dropdown-item{width:100%;padding:12px 16px;background:none;border:none;text-align:left;cursor:pointer;transition:background-color .2s ease;display:flex;align-items:center;gap:8px;font-size:.875rem;color:#475569}.dropdown-item:hover{background:#3b82f60d}.logout-btn{color:#dc2626}.logout-btn:hover{background:#ef44440d}.logout-icon{font-size:1rem}@media (max-width: 768px){.login-card{padding:32px 24px;margin:16px}.login-header h1{font-size:1.75rem}.login-benefits{flex-direction:column;gap:16px}.benefit-item{flex-direction:row;justify-content:center}}/ * Exam Selector Styles */ .exam-selector-container{max-width:1200px;margin:0 auto;padding:24px;min-height:100vh}.exam-selector-header{display:grid;grid-template-columns:1fr auto 1fr;align-items:flex-start;margin-bottom:48px}.welcome-section{text-align:center;justify-self:center}.header-right{justify-self:end}.welcome-section h1{color:var(--text-primary);font-size:3rem;font-weight:700;margin-bottom:16px;background:linear-gradient(135deg,var(--apple-blue) 0%,var(--apple-purple) 50%,var(--apple-blue) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.welcome-section p{color:var(--text-secondary);font-size:1.25rem;margin-bottom:24px}.user-welcome{background:#fffc;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:1px solid rgba(0,0,0,.05);border-radius:12px;padding:12px 24px;display:inline-block;color:#1d1d1f;font-weight:500}.exams-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(350px,1fr));gap:32px;margin-bottom:64px}.exam-card{background:var(--card-background);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border:1px solid var(--border-color);border-radius:16px;overflow:hidden;cursor:pointer;transition:all .3s cubic-bezier(.25,.46,.45,.94);box-shadow:0 8px 32px #0000004d}.exam-card:hover{transform:translateY(-8px);box-shadow:0 20px 40px #0006;border-color:#fff3}.exam-card-header{padding:32px 24px;position:relative;overflow:hidden}.exam-card-header:before{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background:linear-gradient(135deg,#ffffff1a,#ffffff0d)}.exam-icon{font-size:3rem;margin-bottom:16px;position:relative;z-index:1}.exam-badge{background:#fff3;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.3);color:#fff;padding:6px 16px;border-radius:20px;font-size:.875rem;font-weight:600;display:inline-block;position:relative;z-index:1}.exam-card-content{padding:24px}.exam-card-content h3{color:var(--text-primary);font-size:1.5rem;font-weight:600;margin-bottom:12px;line-height:1.3}.exam-card-content p{color:var(--text-secondary);line-height:1.6;margin-bottom:24px}.exam-details{display:flex;flex-direction:column;gap:12px}.detail-item{display:flex;align-items:center;gap:12px;color:var(--text-secondary);font-size:.875rem;font-weight:500}.detail-icon{font-size:1rem;width:20px;text-align:center}.exam-card-footer{padding:24px;border-top:1px solid var(--border-color)}.start-exam-btn{width:100%;background:linear-gradient(135deg,#6366f1,#8b5cf6);color:#fff;border:none;border-radius:12px;padding:16px 24px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .3s cubic-bezier(.25,.46,.45,.94);display:flex;align-items:center;justify-content:center;gap:8px;box-shadow:0 4px 14px #6366f163}.start-exam-btn:hover{transform:translateY(-2px);box-shadow:0 8px 25px #6366f180}.btn-arrow{transition:transform .3s ease}.start-exam-btn:hover .btn-arrow{transform:translate(4px)}.exam-selector-footer{background:var(--card-background);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border:1px solid var(--border-color);border-radius:24px;padding:48px}.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:32px}.feature-item{display:flex;align-items:flex-start;gap:16px;color:#ffffffe6}.feature-icon{width:48px;height:48px;flex-shrink:0;display:flex;align-items:center;justify-content:center;background:#007aff1a;border-radius:12px;color:var(--apple-blue)}.feature-item h4{color:var(--text-primary);font-size:1.125rem;font-weight:600;margin-bottom:8px}.feature-item p{color:var(--text-secondary);line-height:1.6}.bg-gradient-to-br{background-image:linear-gradient(to bottom right,var(--tw-gradient-stops))}.from-orange-500{--tw-gradient-from: #ff9500;--tw-gradient-stops: var(--tw-gradient-from), var(--tw-gradient-to, rgba(255, 149, 0, 0))}.to-yellow-500{--tw-gradient-to: #ffcc02}.from-blue-500{--tw-gradient-from: #007aff;--tw-gradient-stops: var(--tw-gradient-from), var(--tw-gradient-to, rgba(0, 122, 255, 0))}.to-cyan-500{--tw-gradient-to: #5ac8fa}.from-green-500{--tw-gradient-from: #34c759;--tw-gradient-stops: var(--tw-gradient-from), var(--tw-gradient-to, rgba(52, 199, 89, 0))}@media (max-width: 768px){.exam-selector-container{padding:16px}.welcome-section h1{font-size:2rem}.exams-grid{grid-template-columns:1fr;gap:24px}.exam-card-header{padding:24px 20px}.exam-card-content,.exam-card-footer{padding:20px}.exam-selector-footer{padding:32px 24px}.features-grid{grid-template-columns:1fr;gap:24px}}.question-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.reveal-btn{display:flex;align-items:center;gap:8px;padding:8px 16px;background:#007aff1a;border:1px solid rgba(0,122,255,.3);border-radius:8px;color:var(--apple-blue);font-size:.875rem;font-weight:500;cursor:pointer;transition:all .2s ease;position:relative}.reveal-btn:hover{background:#007aff33;border-color:#007aff80;transform:translateY(-1px)}.reveal-btn:active{transform:translateY(0)}.reveal-btn svg{transition:all .2s ease}.reveal-text{font-size:.875rem}.explanation-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.study-mode-badge{background:linear-gradient(135deg,#10b981,#059669);color:#fff;padding:4px 12px;border-radius:20px;font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.5px}.correct-answer-highlight{margin-top:16px;padding:12px 16px;background:#10b9811a;border:1px solid rgba(16,185,129,.3);border-radius:8px;color:#059669;font-size:.875rem}@media (max-width: 768px){.question-header{flex-direction:column;align-items:flex-start;gap:12px}.reveal-btn{align-self:flex-end}.explanation-header{flex-direction:column;align-items:flex-start;gap:8px}.study-mode-badge{align-self:flex-start}}/ * Responsive header layout */ @media (max-width: 768px){.exam-selector-header{grid-template-columns:1fr;gap:20px}.header-left{display:none}.welcome-section{order:1}.header-right{order:2;justify-self:center}}