:root{--bg-hue: 220;--bg-saturation: 20%;--color-bg-base: hsl(var(--bg-hue), var(--bg-saturation), 98%);--color-bg-surface: hsl(var(--bg-hue), var(--bg-saturation), 100%);--color-text-main: hsl(var(--bg-hue), var(--bg-saturation), 15%);--color-text-muted: hsl(var(--bg-hue), var(--bg-saturation), 45%);--color-primary: hsl(150, 60%, 45%);--color-primary-hover: hsl(150, 60%, 40%);--color-primary-light: hsl(150, 60%, 95%);--color-secondary: hsl(210, 80%, 55%);--color-status-good: hsl(140, 65%, 45%);--color-status-good-bg: hsl(140, 65%, 95%);--color-status-warning: hsl(40, 90%, 50%);--color-status-warning-bg: hsl(40, 90%, 95%);--color-status-bad: hsl(0, 70%, 55%);--color-status-bad-bg: hsl(0, 70%, 97%);--color-status-unattempted: hsl(var(--bg-hue), 10%, 90%);--font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;--color-border: hsl(var(--bg-hue), 15%, 90%);--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .05);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .05), 0 2px 4px -2px rgb(0 0 0 / .05);--shadow-lg: 0 10px 15px -3px rgb(0 0 0 / .05), 0 4px 6px -4px rgb(0 0 0 / .05);--radius-md: .5rem;--radius-lg: 1rem;--radius-xl: 1.5rem}@media(prefers-color-scheme:dark){:root{--color-bg-base: hsl(var(--bg-hue), 30%, 8%);--color-bg-surface: hsl(var(--bg-hue), 30%, 12%);--color-text-main: hsl(var(--bg-hue), 20%, 95%);--color-text-muted: hsl(var(--bg-hue), 20%, 65%);--color-border: hsl(var(--bg-hue), 30%, 18%);--color-status-good-bg: hsl(140, 65%, 15%);--color-status-warning-bg: hsl(40, 90%, 15%);--color-status-bad-bg: hsl(0, 70%, 15%);--color-status-unattempted: hsl(var(--bg-hue), 20%, 15%);--color-primary-light: hsl(150, 60%, 15%);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .3), 0 2px 4px -2px rgb(0 0 0 / .3);--shadow-lg: 0 10px 15px -3px rgb(0 0 0 / .4), 0 4px 6px -4px rgb(0 0 0 / .4)}}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-sans);background-color:var(--color-bg-base);color:var(--color-text-main);line-height:1.6;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.glass{background:var(--color-bg-surface);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid var(--color-border)}.text-gradient{background:linear-gradient(135deg,var(--color-primary),var(--color-secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.app-layout{display:flex;min-height:100vh;width:100%}.main-content{flex:1;min-width:0}.app-wrapper{max-width:1200px;margin:0 auto;padding:2rem}@media(max-width:1024px){.app-layout{flex-direction:column}.sidebar{position:fixed;top:0;left:0;bottom:0;z-index:1000;width:280px;transform:translate(-100%);transition:transform .3s cubic-bezier(.4,0,.2,1);box-shadow:10px 0 20px #0003;border-right:1px solid var(--color-border)}.sidebar.open{transform:translate(0)}.main-content{margin-top:50px}.app-wrapper{padding:.25rem}}.mobile-top-nav{display:none;position:fixed;top:0;left:0;right:0;height:50px;background-color:var(--color-bg-surface);border-bottom:1px solid var(--color-border);padding:0 1rem;align-items:center;z-index:900;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px)}@media(max-width:1024px){.mobile-top-nav{display:flex}}.menu-toggle{background:transparent;border:none;color:var(--color-text-main);cursor:pointer;padding:.5rem;display:flex;align-items:center;justify-content:center;margin-right:1rem}.mobile-logo{font-weight:700;font-size:1.1rem;color:var(--color-primary)}.sidebar-overlay{position:fixed;inset:0;background:#00000080;z-index:950;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}@media(max-width:768px){.header{flex-direction:column;align-items:flex-start;padding:1rem;gap:.75rem}.stats-cards{flex-wrap:wrap;width:100%;gap:.5rem}.stat-card{flex:1 1 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#0000001a}.mobile-selection-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:.5rem}.selection-btn{aspect-ratio:1;display:flex;align-items:center;justify-content:center;border:2px solid var(--color-border);border-radius:var(--radius-md);background:var(--color-bg-base);font-weight:700;color:var(--color-text-main);cursor:pointer}.selection-btn.selected{border-color:var(--color-primary);background-color:var(--color-primary-light);color:var(--color-primary)}.selection-btn.correct{background-color:var(--color-status-good);color:#fff;border-color:var(--color-status-good)}.selection-btn.incorrect{background-color:var(--color-status-bad);color:#fff;border-color:var(--color-status-bad)}.quiz-header{padding:0 .5rem;gap:.75rem;margin-bottom:.4rem}.explanation-box{margin-bottom:180px!important;padding-bottom:2rem}.back-btn{padding:.4rem .75rem;font-size:.85rem}.desktop-table{display:none}.mobile-matrix{display:flex;flex-direction:column;gap:1rem}.mobile-domain-card{border:1px solid 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var(--color-status-bad);color:var(--color-status-bad);padding:1rem;border-radius:var(--radius-md);display:flex;align-items:center;gap:.5rem;font-size:.9rem}.sidebar{width:280px;display:flex;flex-direction:column;background-color:var(--color-bg-base);border-right:1px solid var(--color-border);flex-shrink:0}.sidebar-header{padding:1.5rem;border-bottom:1px solid var(--color-border)}.logo-container{display:flex;align-items:center;gap:.75rem;color:var(--color-primary)}.logo-text{font-size:1.25rem;font-weight:700;letter-spacing:-.02em}.sidebar-content{flex:1;padding:1.5rem;overflow-y:auto}.sidebar-title{font-size:.85rem;text-transform:uppercase;letter-spacing:.05em;color:var(--color-text-muted);margin-bottom:1rem;padding-left:.5rem}.exam-list{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:.5rem}.exam-list-item{position:relative;display:flex;align-items:center}.exam-nav-item{display:flex;align-items:center;gap:1rem;width:100%;padding:.75rem 2.5rem .75rem .75rem;border-radius:var(--radius-md);background:transparent;border:1px solid transparent;cursor:pointer;transition:all .2s;text-align:left}.delete-exam-btn{position:absolute;right:.5rem;top:50%;transform:translateY(-50%);background:transparent;border:none;color:var(--color-text-muted);opacity:0;cursor:pointer;padding:.5rem;border-radius:50%;transition:all .2s;z-index:5;display:flex;align-items:center;justify-content:center}.exam-list-item:hover 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td{padding:1rem;font-weight:700;color:var(--color-secondary);font-size:1rem;border-bottom:2px solid var(--color-border);background-color:var(--color-bg-base)}.lesson-row td{padding:.25rem .5rem;background-color:var(--color-bg-surface);border-bottom:1px solid var(--color-border);border-right:1px solid var(--color-border)}.lesson-row td:first-child{border-radius:0}.lesson-row td:last-child{border-radius:0;border-right:none}.lesson-title-text{font-family:var(--font-sans);font-size:.95rem;font-weight:600;color:var(--color-text-main);display:block}.status-cell{text-align:center;width:70px;padding:0}.cell-content-btn{display:flex;flex-direction:column;align-items:center;justify-content:center;width:100%;height:48px;font-size:.8rem;font-weight:600;background:transparent;border:none;color:inherit;font-family:inherit;cursor:pointer;transition:background-color .2s 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ease}.back-btn:hover{background:var(--color-bg-base);transform:translate(-4px)}.progress-indicator{flex:1}.progress-text{display:block;font-size:.85rem;color:var(--color-text-muted);margin-bottom:.25rem;font-weight:600}.progress-bar-bg{width:100%;height:6px;background-color:var(--color-border);border-radius:4px;overflow:hidden}.progress-bar-fill{height:100%;background-color:var(--color-primary);transition:width .3s ease}.quiz-card{padding:3rem;border-radius:var(--radius-xl);box-shadow:var(--shadow-lg)}.question-text{font-size:1.3rem;line-height:1.6;font-weight:600;margin-bottom:2rem}.options-list{display:flex;flex-direction:column;gap:1rem}.option-btn{display:flex;align-items:center;gap:1rem;padding:1.25rem;border:2px solid var(--color-border);border-radius:var(--radius-lg);background:var(--color-bg-surface);color:var(--color-text-main);font-family:var(--font-sans);font-size:1.05rem;text-align:left;cursor:pointer;transition:all .2s ease;position:relative}.option-btn:hover:not(.disabled){border-color:var(--color-primary);transform:translateY(-2px);box-shadow:var(--shadow-md)}.option-btn.selected{border-color:var(--color-primary);background-color:var(--color-primary-light)}.option-key{display:flex;align-items:center;justify-content:center;width:28px;height:28px;background-color:var(--color-border);border-radius:50%;font-weight:700;font-size:.9rem;color:var(--color-text-muted)}.option-btn.selected .option-key{background-color:var(--color-primary);color:#fff}.option-btn.correct{border-color:var(--color-status-good);background-color:var(--color-status-good-bg)}.option-btn.correct .option-key{background-color:var(--color-status-good);color:#fff}.option-btn.incorrect{border-color:var(--color-status-bad);background-color:var(--color-status-bad-bg);opacity:.7}.option-btn.disabled{cursor:default;opacity:.6}.option-btn.disabled.correct{opacity:1}.result-icon{position:absolute;right:1.25rem}.result-icon.correct{color:var(--color-status-good)}.result-icon.incorrect{color:var(--color-status-bad)}.explanation-box{margin-top:2rem;padding:1.5rem;border-radius:var(--radius-lg);background-color:var(--color-bg-base);border-left:4px solid var(--color-primary)}.explanation-box h3{margin-bottom:.5rem;font-size:1.1rem}.text-correct{color:var(--color-status-good)}.text-incorrect{color:var(--color-status-bad)}.explanation-text{color:var(--color-text-muted);line-height:1.6;margin-bottom:1.5rem}.btn-primary{width:100%;padding:1rem;background-color:var(--color-primary);color:#fff;border:none;border-radius:var(--radius-md);font-family:var(--font-sans);font-size:1rem;font-weight:600;cursor:pointer;transition:all .2s}.btn-primary:hover{background-color:var(--color-primary-hover);transform:translateY(-2px);box-shadow:var(--shadow-md)}.result-view{min-height:60vh;display:flex;align-items:center;justify-content:center}.result-card{padding:4rem;text-align:center;border-radius:var(--radius-xl);max-width:500px;width:100%}.result-card h2{font-size:2rem;margin-bottom:1rem;background:linear-gradient(135deg,var(--color-primary),var(--color-secondary));background-clip:text;-webkit-background-clip:text;-webkit-text-fill-color:transparent}.score-text{font-size:1.5rem;font-weight:700;margin-bottom:2rem;color:var(--color-text-main)}@media(min-width:769px){.mobile-quiz-footer,.options-list-text{display:none!important}}.mode-modal-overlay{position:fixed;inset:0;background:#0009;backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);display:flex;align-items:center;justify-content:center;z-index:2000;padding:1rem;animation:fadeIn .2s ease}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.mode-modal{background:var(--color-bg-surface);border:1px solid var(--color-border);border-radius:var(--radius-xl);padding:2.5rem;max-width:520px;width:100%;box-shadow:var(--shadow-lg);animation:slideUp .25s cubic-bezier(.34,1.56,.64,1)}@keyframes slideUp{0%{transform:translateY(24px);opacity:0}to{transform:translateY(0);opacity:1}}.mode-modal h2{font-size:1.4rem;font-weight:700;margin-bottom:.5rem;background:linear-gradient(135deg,var(--color-primary),var(--color-secondary));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}.mode-modal p{font-size:.9rem;color:var(--color-text-muted);margin-bottom:1.75rem}.mode-options{display:flex;flex-direction:column;gap:1rem;margin-bottom:1.5rem}.mode-option-btn{display:flex;align-items:flex-start;gap:1rem;padding:1.25rem;border:2px solid var(--color-border);border-radius:var(--radius-lg);background:var(--color-bg-base);color:var(--color-text-main);font-family:var(--font-sans);text-align:left;cursor:pointer;transition:all .2s ease}.mode-option-btn:hover{border-color:var(--color-primary);background:var(--color-primary-light);transform:translateY(-2px);box-shadow:var(--shadow-md)}.mode-option-btn.exam-mode:hover{border-color:var(--color-secondary);background:#8b5cf614}.mode-option-icon{font-size:1.8rem;line-height:1;flex-shrink:0}.mode-option-info{display:flex;flex-direction:column;gap:.25rem}.mode-option-title{font-size:1rem;font-weight:700;color:var(--color-text-main)}.mode-option-desc{font-size:.85rem;color:var(--color-text-muted);line-height:1.4}.mode-modal-cancel{width:100%;padding:.75rem;background:transparent;border:1px solid var(--color-border);border-radius:var(--radius-md);color:var(--color-text-muted);font-family:var(--font-sans);font-size:.9rem;cursor:pointer;transition:all .2s}.mode-modal-cancel:hover{background:var(--color-bg-base);color:var(--color-text-main)}.mode-badge{display:inline-flex;align-items:center;gap:.35rem;padding:.25rem .75rem;border-radius:999px;font-size:.78rem;font-weight:700;letter-spacing:.03em}.mode-badge.instant{background:var(--color-primary-light);color:var(--color-primary);border:1px solid var(--color-primary)}.mode-badge.exam{background:#8b5cf61a;color:var(--color-secondary);border:1px solid var(--color-secondary)}.exam-result-container{max-width:800px;margin:0 auto;padding-bottom:4rem}.exam-result-header{text-align:center;padding:3rem 2rem 2rem;border-radius:var(--radius-xl);margin-bottom:2rem}.exam-result-header h2{font-size:2.2rem;font-weight:700;margin-bottom:.75rem;background:linear-gradient(135deg,var(--color-primary),var(--color-secondary));background-clip:text;-webkit-background-clip:text;-webkit-text-fill-color:transparent}.exam-score-circle{display:inline-flex;flex-direction:column;align-items:center;justify-content:center;width:140px;height:140px;border-radius:50%;border:5px solid var(--color-primary);margin:1rem auto;background:var(--color-primary-light)}.exam-score-number{font-size:2.8rem;font-weight:800;color:var(--color-primary);line-height:1}.exam-score-denom{font-size:.9rem;color:var(--color-text-muted);font-weight:600}.exam-score-percent{font-size:1.1rem;font-weight:700;color:var(--color-text-muted);margin-top:.25rem}.exam-result-actions{display:flex;gap:1rem;justify-content:center;margin-top:1.5rem;flex-wrap:wrap}.exam-result-actions .btn-primary{width:auto;padding:.85rem 2rem}.btn-secondary{padding:.85rem 2rem;background:transparent;border:1px solid var(--color-border);border-radius:var(--radius-md);color:var(--color-text-main);font-family:var(--font-sans);font-size:1rem;font-weight:600;cursor:pointer;transition:all .2s}.btn-secondary:hover{background:var(--color-bg-base);border-color:var(--color-primary);color:var(--color-primary)}.review-list-section{padding:1.5rem 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