:root{--primary-color: #4a90e2;--secondary-color: #50e3c2;--danger-color: #e91e63;--font-family: "Poppins", sans-serif;--border-radius: 12px;--box-shadow: 0 4px 12px rgba(0, 0, 0, .08);--background-color: #f4f7f9;--surface-color: #ffffff;--subtle-bg-color: #f9fafb;--text-color: #333333;--light-text-color: #888888;--user-message-bg: #e1f5fe;--model-message-bg: #f1f3f4;--border-color: #e0e0e0;--hover-color: #f0f0f0;--code-bg-color: #e9ecef;--surface-transparent-color: rgba(255, 255, 255, .7);--weakness-hunter-bg: #fffbeb;--weakness-hunter-border: #fde68a;--weakness-hunter-text: #b45309;--weakness-hunter-header: #92400e;--weakness-hunter-button: #f59e0b;--weakness-hunter-button-hover: #d97706}body.dark-mode{--background-color: #121212;--surface-color: #1e1e1e;--subtle-bg-color: #242424;--text-color: #e0e0e0;--light-text-color: #888888;--user-message-bg: #2c3e50;--model-message-bg: #2a2a2a;--border-color: #333333;--hover-color: #2a2a2a;--code-bg-color: #282c34;--surface-transparent-color: 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solid var(--border-color);background-color:var(--background-color);color:var(--text-color);font-family:var(--font-family);font-size:1.1rem}.quiz-btn{padding:1rem 1.5rem;border:none;border-radius:var(--border-radius);font-size:1.1rem;font-weight:600;cursor:pointer;transition:background-color .2s}.quiz-btn.primary{background-color:var(--primary-color);color:#fff}.quiz-btn.primary:hover:not(:disabled){background-color:#3a7ac8}.quiz-btn:disabled{background-color:#a0c3ed;cursor:not-allowed}.quiz-progress-bar{width:100%;height:8px;background-color:var(--border-color);border-radius:4px;margin-bottom:1.5rem}.quiz-progress{height:100%;background-color:var(--secondary-color);border-radius:4px;transition:width .3s ease}.quiz-header{text-align:right;color:var(--light-text-color);margin-bottom:1rem}.quiz-question-text{font-size:1.5rem;font-weight:500;margin-bottom:2rem;min-height:100px}.quiz-options{display:grid;grid-template-columns:1fr 1fr;gap:1rem;margin-bottom:2rem}.quiz-option-btn{padding:1rem;border:2px solid var(--border-color);border-radius:var(--border-radius);background-color:transparent;color:var(--text-color);text-align:left;font-size:1rem;cursor:pointer;transition:all .2s}.quiz-option-btn:hover:not(:disabled){border-color:var(--secondary-color);background-color:var(--hover-color)}.quiz-option-btn.selected{border-color:var(--primary-color);background-color:var(--user-message-bg);font-weight:600}.quiz-btn.submit{margin:1rem auto 0}.results-score-circle{position:relative;width:150px;height:150px;margin:1.5rem auto}.score-ring{width:100%;height:100%;transform:rotate(-90deg)}.score-ring-bg{fill:none;stroke:var(--border-color);stroke-width:3.8}.score-ring-fg{fill:none;stroke:var(--primary-color);stroke-width:4;stroke-linecap:round;transition:stroke-dasharray .5s ease}.score-text{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);text-align:center}.score{font-size:3rem;font-weight:700;color:var(--primary-color)}.total{font-size:1.2rem;color:var(--light-text-color)}.results-feedback{font-size:1.2rem;font-weight:500;margin-bottom:2rem}.review-section{text-align:left}.review-title{font-size:1.5rem;margin-bottom:1.5rem;padding-bottom:.75rem;border-bottom:1px solid var(--border-color)}.review-item{margin-bottom:1.5rem;padding-bottom:1.5rem;border-bottom:1px solid var(--border-color)}.review-item:last-child{border-bottom:none;margin-bottom:0;padding-bottom:0}.review-question{font-weight:500;margin-bottom:.75rem}.review-options{list-style:none;padding-left:0;display:flex;flex-direction:column;gap:.5rem}.review-options li{padding:.5rem 1rem;border-radius:8px;border:1px solid var(--border-color)}.review-options li.correct{background-color:#d4edda;border-color:#c3e6cb;color:#155724}.review-options 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40px;position:relative;width:50%}.timeline-item:nth-child(odd){left:0;text-align:right}.timeline-item:nth-child(2n){left:50%;text-align:left}.timeline-dot{content:"";position:absolute;width:15px;height:15px;border-radius:50%;background-color:var(--surface-color);border:3px solid var(--primary-color);top:25px;z-index:1}.timeline-item:nth-child(odd) .timeline-dot{right:-7.5px}.timeline-item:nth-child(2n) .timeline-dot{left:-7.5px}.timeline-content{padding:1rem;background-color:var(--subtle-bg-color);border-radius:var(--border-radius);position:relative}.timeline-year{font-size:1.2rem;font-weight:700;color:var(--primary-color);margin-bottom:.5rem;display:inline-block}.timeline-title{font-size:1.1rem;font-weight:600;margin-bottom:.5rem}.timeline-description{font-size:.95rem;color:var(--light-text-color);line-height:1.5}@media (max-width: 768px){.timeline-container:before{left:20px}.timeline-item{width:100%;padding-left:50px;padding-right:15px}.timeline-item:nth-child(odd),.timeline-item:nth-child(2n){left:0;text-align:left}.timeline-item:nth-child(odd) .timeline-dot,.timeline-item:nth-child(2n) .timeline-dot{left:12.5px}}@media (max-width: 600px){.timeline-input-area{flex-direction:column}}.subscription-management-container{max-width:1200px;margin:0 auto;padding:2rem;background-color:var(--background-color);min-height:100vh}.management-header{text-align:center;margin-bottom:3rem}.management-header h1{font-size:2.5rem;font-weight:700;color:var(--text-color);margin-bottom:1rem}.management-header p{font-size:1.2rem;color:var(--light-text-color);max-width:600px;margin:0 auto;line-height:1.6}.subscription-grid{display:grid;grid-template-columns:1fr 1fr;gap:2rem;margin-bottom:3rem}@media (max-width: 968px){.subscription-grid{grid-template-columns:1fr}}.subscription-card{background-color:var(--surface-color);border-radius:var(--border-radius);box-shadow:var(--box-shadow);padding:2rem;border:1px solid var(--border-color)}.card-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:1.5rem;padding-bottom:1rem;border-bottom:1px solid var(--border-color)}.card-header h2{font-size:1.4rem;font-weight:600;color:var(--text-color)}.status-badge{display:flex;align-items:center;gap:8px;padding:6px 12px;border-radius:20px;font-size:.9rem;font-weight:500}.status-badge.active{background-color:var(--secondary-color);color:#fff}.status-badge.expired{background-color:var(--danger-color);color:#fff}.status-badge.inactive{background-color:var(--hover-color);color:var(--text-color)}.status-indicator{width:8px;height:8px;border-radius:50%}.subscription-details{margin-bottom:1.5rem}.detail-row{display:flex;justify-content:space-between;align-items:center;padding:12px 0;border-bottom:1px solid var(--border-color)}.detail-row:last-child{border-bottom:none}.detail-row .label{font-weight:500;color:var(--light-text-color)}.detail-row .value{font-weight:600;color:var(--text-color)}.no-subscription{text-align:center;padding:3rem 0}.no-subscription p{color:var(--light-text-color);margin-bottom:1.5rem;font-size:1.1rem}.subscription-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}.btn{padding:.75rem 1.5rem;border:none;border-radius:var(--border-radius);font-size:.95rem;font-weight:600;cursor:pointer;transition:all .2s ease;text-decoration:none;display:inline-flex;align-items:center;gap:8px;font-family:var(--font-family)}.btn-primary{background-color:var(--primary-color);color:#fff}.btn-primary:hover{background-color:#3a7ac8;transform:translateY(-2px);box-shadow:0 4px 12px #4a90e24d}.btn-secondary{background-color:var(--hover-color);color:var(--text-color);border:1px solid var(--border-color)}.btn-secondary:hover{background-color:var(--border-color);color:var(--text-color);transform:translateY(-2px)}.btn-danger{background-color:var(--danger-color);color:#fff}.btn-danger:hover{background-color:#c91a56;transform:translateY(-2px);box-shadow:0 4px 12px #ef44444d}.plans-grid{display:grid;gap:1.5rem}.plan-card{background-color:var(--surface-color);border-radius:var(--border-radius);padding:1.5rem;border:1px solid var(--border-color);position:relative;transition:all .2s ease}.plan-card:hover{transform:translateY(-2px);box-shadow:0 8px 25px #0000001a;border-color:var(--primary-color)}.plan-card.popular{border-color:var(--primary-color);background:linear-gradient(135deg,var(--subtle-bg-color) 0%,rgba(74,144,226,.05) 100%)}.popular-badge{position:absolute;top:-12px;left:50%;transform:translate(-50%);background-color:var(--primary-color);color:#fff;padding:6px 16px;border-radius:20px;font-size:.8rem;font-weight:600;text-transform:uppercase;letter-spacing:.5px}.plan-header{text-align:center;margin-bottom:1.5rem}.plan-header h3{font-size:1.3rem;font-weight:600;color:var(--text-color);margin-bottom:.5rem}.price{display:flex;align-items:baseline;justify-content:center;gap:4px;margin-bottom:.5rem}.currency{font-size:1.2rem;color:var(--light-text-color)}.amount{font-size:2rem;font-weight:700;color:var(--primary-color)}.period{font-size:.9rem;color:var(--light-text-color)}.plan-features{list-style:none;padding:0;margin-bottom:1.5rem}.plan-features li{display:flex;align-items:center;gap:10px;padding:8px 0;color:var(--text-color);font-size:.95rem;border-bottom:1px solid var(--border-color)}.plan-features li:last-child{border-bottom:none}.check-icon{color:var(--secondary-color);font-weight:700;flex-shrink:0}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.modal{background-color:var(--surface-color);border-radius:var(--border-radius);padding:2rem;max-width:500px;width:90%;max-height:90vh;overflow-y:auto;border:1px solid var(--border-color);box-shadow:0 20px 50px #0003}.modal-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:1.5rem;padding-bottom:1rem;border-bottom:1px solid var(--border-color)}.modal-header h3{font-size:1.5rem;font-weight:600;color:var(--text-color)}.close-btn{background:none;border:none;font-size:1.5rem;cursor:pointer;color:var(--light-text-color);padding:.5rem;border-radius:50%;transition:all .2s ease;width:40px;height:40px;display:flex;align-items:center;justify-content:center}.close-btn:hover{background-color:var(--hover-color);color:var(--text-color)}.modal-body{margin-bottom:1.5rem}.modal-body p{color:var(--text-color);margin-bottom:1rem;line-height:1.6}.cancel-warning{background-color:var(--danger-color);border:1px solid var(--danger-color);border-radius:var(--border-radius);padding:1rem;margin-top:1rem;color:#fff}.cancel-warning strong{display:block;margin-bottom:.75rem;font-size:1.1rem}.cancel-warning ul{margin:0;padding-left:1.2rem}.cancel-warning li{margin-bottom:.5rem;line-height:1.5}.modal-actions{display:flex;gap:12px;justify-content:flex-end}@media (max-width: 640px){.subscription-management-container{padding:1rem}.management-header h1{font-size:2rem}.management-header p{font-size:1rem;padding:0 1rem}.subscription-card{padding:1.5rem}.card-header{flex-direction:column;gap:1rem;align-items:flex-start}.subscription-actions{flex-direction:column}.btn{width:100%;justify-content:center}.modal{padding:1.5rem}.modal-actions{flex-direction:column}.plans-grid{gap:1rem}.plan-card{padding:1.2rem}}.loading{opacity:.7;pointer-events:none}@media (prefers-color-scheme: dark){.subscription-management-container{background-color:var(--background-color)}.subscription-card,.plan-card,.modal{background-color:var(--surface-color);border-color:var(--border-color)}.card-header h2,.modal-header h3,.detail-row .value,.plan-header h3,.plan-features li,.modal-body p{color:var(--text-color)}.detail-row .label{color:var(--light-text-color)}.status-badge.inactive{background-color:var(--hover-color);color:var(--text-color)}.plan-card.popular{background:linear-gradient(135deg,var(--surface-color) 0%,rgba(74,144,226,.1) 100%)}.close-btn:hover{background-color:var(--hover-color);color:var(--text-color)}.cancel-warning{background-color:var(--danger-color);border-color:var(--danger-color)}}.mobile-menu-backdrop{position:fixed;top:0;left:0;width:100%;height:100%;background-color:#00000080;z-index:1001;opacity:0;visibility:hidden;transition:opacity .3s ease,visibility .3s ease}.mobile-menu-backdrop.open{opacity:1;visibility:visible}.mobile-menu{position:fixed;top:0;right:0;width:280px;height:100%;background-color:var(--surface-color);z-index:1002;box-shadow:-4px 0 15px #00000026;transform:translate(100%);transition:transform .3s ease-out;display:flex;flex-direction:column}.mobile-menu.open{transform:translate(0)}.mobile-menu-header{display:flex;justify-content:space-between;align-items:center;padding:1rem 1.5rem;border-bottom:1px solid var(--border-color)}.mobile-menu-header h3{font-size:1.2rem;font-weight:600}.close-menu-btn{background:none;border:none;font-size:2.5rem;line-height:1;color:var(--light-text-color);cursor:pointer;padding:0}.mobile-menu-links{list-style:none;padding:1rem 0;margin:0;flex-grow:1}.mobile-menu-links button{display:flex;align-items:center;gap:1rem;width:100%;padding:1rem 1.5rem;background:none;border:none;text-align:left;font-size:1.1rem;font-family:var(--font-family);cursor:pointer;color:var(--text-color);transition:background-color .2s}.mobile-menu-links button:hover{background-color:var(--subtle-bg-color)}.mobile-menu-links img{width:24px;height:24px;opacity:.7}.mobile-menu-footer{padding:1rem 1.5rem;border-top:1px solid var(--border-color)}.logout-btn{width:100%;padding:.75rem 1.5rem;border:none;border-radius:var(--border-radius);font-family:var(--font-family);font-size:1rem;font-weight:600;cursor:pointer;background-color:var(--danger-color);color:#fff;text-align:center}.logout-btn:hover{opacity:.9}.app-container{display:flex;flex-direction:column;height:100vh;background:linear-gradient(135deg,#e0f7fa,#d1c4e9);max-width:100vw}.page-container{height:100vh;width:100vw;overflow-y:auto;background-color:var(--background-color)}