.app-layout{flex-direction:column;min-height:100vh;display:flex}.navbar{background-color:var(--surface-color);border-bottom:1px solid var(--border-color);z-index:100;padding:1rem 0;position:sticky;top:0}.nav-content{justify-content:space-between;align-items:center;display:flex}.nav-brand{color:var(--primary-color);align-items:center;gap:.5rem;font-size:1.25rem;font-weight:700;display:flex}.nav-links{gap:1.5rem;display:flex}.nav-link{color:var(--text-muted);font-weight:500}.nav-link:hover,.nav-link.active{color:var(--text-main)}.main-content{flex:1;padding:2rem 0}.card-grid{grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1.5rem;margin-top:1.5rem;display:grid}.card{background-color:var(--surface-color);border:1px solid var(--border-color);border-radius:.5rem;flex-direction:column;padding:1.5rem;transition:transform .2s,border-color .2s;display:flex}.card:hover{border-color:var(--primary-color);transform:translateY(-2px)}.card-header{align-items:center;gap:.75rem;margin-bottom:1rem;display:flex}.card-icon{color:var(--primary-color)}.card-title{margin:0;font-size:1.25rem}.card-body{color:var(--text-muted);flex:1;margin-bottom:1.5rem}.btn{border-radius:.375rem;justify-content:center;align-items:center;gap:.5rem;padding:.5rem 1rem;font-weight:500;transition:background-color .2s,color .2s;display:inline-flex}.btn-primary{background-color:var(--primary-color);color:#fff}.btn-primary:hover{background-color:var(--primary-hover);color:#fff}.btn-outline{border:1px solid var(--border-color);color:var(--text-main);background-color:#0000}.btn-outline:hover{border-color:var(--primary-color);color:var(--primary-color)}.quiz-container,.flashcard-container,.mock-container{max-width:800px;margin:0 auto}.question-card{background-color:var(--surface-color);border-radius:.5rem;margin-bottom:1.5rem;padding:2rem}.option-btn{text-align:left;background-color:var(--bg-color);border:1px solid var(--border-color);width:100%;color:var(--text-main);border-radius:.375rem;margin-bottom:.75rem;padding:1rem;transition:all .2s;display:block}.option-btn:hover:not(:disabled){border-color:var(--primary-color);background-color:var(--surface-hover)}.option-btn.correct{border-color:var(--success-color);background-color:#22c55e1a}.option-btn.incorrect{border-color:var(--error-color);background-color:#ef44441a}.explanation{border-left:4px solid var(--primary-color);background-color:#f6821f1a;border-radius:0 .375rem .375rem 0;margin-top:1.5rem;padding:1rem}.flashcard{perspective:1000px;cursor:pointer;width:100%;height:300px;margin-bottom:2rem}.flashcard-inner{text-align:center;width:100%;height:100%;transform-style:preserve-3d;transition:transform .6s;position:relative}.flashcard.flipped .flashcard-inner{transform:rotateY(180deg)}.flashcard-front,.flashcard-back{backface-visibility:hidden;background-color:var(--surface-color);border:1px solid var(--border-color);border-radius:.5rem;flex-direction:column;justify-content:center;align-items:center;width:100%;height:100%;padding:2rem;display:flex;position:absolute;box-shadow:0 4px 6px -1px #0000001a}.flashcard-back{border-color:var(--primary-color);transform:rotateY(180deg)}.flashcard-category{color:var(--primary-color);text-transform:uppercase;letter-spacing:.05em;font-size:.875rem;font-weight:600;position:absolute;top:1rem;left:1rem}.flashcard-controls{justify-content:center;gap:1rem;display:flex}.progress-bar-bg{background-color:var(--surface-color);border-radius:9999px;width:100%;height:.5rem;margin:1rem 0;overflow:hidden}.progress-bar-fill{background-color:var(--primary-color);height:100%;transition:width .3s}.search-bar{background-color:var(--surface-color);border:1px solid var(--border-color);width:100%;color:var(--text-main);border-radius:.375rem;padding:.75rem 1rem .75rem 2.5rem;font-size:1rem}.search-bar:focus{border-color:var(--primary-color);outline:none}.search-container{max-width:500px;margin-bottom:2rem;position:relative}.search-icon{color:var(--text-muted);position:absolute;top:50%;left:.75rem;transform:translateY(-50%)}.guide-section{margin-bottom:3rem}.guide-section h2{color:var(--primary-color);border-bottom:1px solid var(--border-color);margin-bottom:1rem;padding-bottom:.5rem}.key-points{background-color:var(--surface-color);border-radius:.5rem;margin-top:1rem;padding:1.5rem}.key-points li{margin-bottom:.5rem}.rubric-item{background-color:var(--bg-color);border:1px solid var(--border-color);cursor:pointer;border-radius:.375rem;align-items:flex-start;gap:.75rem;margin-bottom:1rem;padding:1rem;display:flex}.rubric-item:hover{border-color:var(--primary-color)}.rubric-item input[type=checkbox]{width:1.25rem;height:1.25rem;accent-color:var(--primary-color);margin-top:.25rem}.text-center{text-align:center}.mt-4{margin-top:1rem}.mb-4{margin-bottom:1rem}.mb-8{margin-bottom:2rem}.flex{display:flex}.justify-between{justify-content:space-between}.items-center{align-items:center}.gap-2{gap:.5rem}.gap-4{gap:1rem}.text-muted{color:var(--text-muted)}.text-primary{color:var(--primary-color)}:root{--bg-color:#0f172a;--surface-color:#1e293b;--surface-hover:#334155;--primary-color:#f6821f;--primary-hover:#fb923c;--text-main:#f8fafc;--text-muted:#94a3b8;--border-color:#334155;--success-color:#22c55e;--error-color:#ef4444;--font-sans:system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-sans);background-color:var(--bg-color);color:var(--text-main);-webkit-font-smoothing:antialiased;line-height:1.6}a{color:var(--primary-color);text-decoration:none;transition:color .2s}a:hover{color:var(--primary-hover)}button{cursor:pointer;border:none;outline:none;font-family:inherit}h1,h2,h3,h4,h5,h6{margin-bottom:.5rem;font-weight:600;line-height:1.2}ul,ol{padding-left:1.5rem}.container{max-width:1200px;margin:0 auto;padding:0 1.5rem}