.app-nav ul li .router-link-exact-active[data-v-1c066092]{background-color:#fff;color:var(--primary-color, #4A90E2);font-weight:600}@media (max-width: 767px){.app-nav ul li a[data-v-1c066092]{padding:.9rem 1rem}}#qa-area[data-v-f0a81363]{display:flex;flex-direction:column;height:500px;border:1px solid #e0e0e0;border-radius:10px;overflow:hidden;background-color:#f9f9f9}#chat-box[data-v-f0a81363]{flex-grow:1;padding:15px;overflow-y:auto;display:flex;flex-direction:column;gap:12px}.message[data-v-f0a81363]{max-width:80%;padding:10px 15px;border-radius:18px;line-height:1.4;word-wrap:break-word}.bot-message[data-v-f0a81363]{background-color:#dde4ef;color:#000;border-bottom-left-radius:4px;align-self:flex-start}.user-message[data-v-f0a81363]{background-color:#47c1edb7;color:#000;border-bottom-right-radius:4px;align-self:flex-end}#input-area[data-v-f0a81363]{display:flex;padding:10px;border-top:1px solid #170b42;background-color:#b7faf575}#user-question[data-v-f0a81363]{flex-grow:1;border:1px solid #152bd0;border-radius:20px;padding:10px 15px;font-size:1rem;outline:none;transition:border-color .2s}#user-question[data-v-f0a81363]:focus{border-color:#15c132}#ask-btn[data-v-f0a81363]{background-color:#0d05e2;color:#fff;border:none;border-radius:20px;padding:10px 20px;margin-left:10px;cursor:pointer;transition:background-color .2s}#ask-btn[data-v-f0a81363]:hover:not(:disabled){background-color:#140ca4}#ask-btn[data-v-f0a81363]:disabled{background-color:#08c440;cursor:not-allowed}.main-content-area{flex-grow:1;padding-top:25px;padding-bottom:25px}.qa-box-container{margin-top:30px;margin-bottom:30px}:root{--primary-color: #4b91e2;--primary-color-dark: #3c7ddb;--primary-color-deep-dark: #2a5a99;--primary-color-light: #e0f2fe;--secondary-color: #5cb85c;--text-color: #343a40;--text-color-light: #6c757d;--text-color-on-primary: #ffffff;--text-color-on-dark-bg: #f8f9fa;--background-color: #f4f6f9;--card-background-color: #ffffff;--border-color: #dee2e6;--input-border-color: #ced4da;--error-color: #dc3545;--success-color: var(--secondary-color);--warning-color: #ffc107;--info-color: #17a2b8;--font-main: "Poppins", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--font-code: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;--border-radius-sm: .25rem;--border-radius-md: .5rem;--border-radius-lg: .75rem;--shadow-sm: 0 1px 3px rgba(0, 0, 0, .06);--shadow-md: 0 4px 10px rgba(0, 0, 0, .08);--shadow-lg: 0 8px 25px rgba(0, 0, 0, .1);--container-padding-x: 15px;--base-font-size-desktop: 16px;--base-font-size-tablet: 15px;--base-font-size-mobile: 14px}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;font-size:var(--base-font-size-mobile);-webkit-text-size-adjust:100%}body{font-family:var(--font-main);line-height:1.7;background-color:var(--background-color);color:var(--text-color);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;overflow-x:hidden}h1,h2,h3,h4,h5,h6{margin-bottom:.8rem;font-weight:600;line-height:1.3;color:var(--text-color)}h1{font-size:2.1em;margin-bottom:1rem}h2{font-size:1.7em;margin-bottom:.9rem}h3{font-size:1.3em;margin-bottom:.7rem}h4{font-size:1.1em;margin-bottom:.6rem}p{margin-bottom:1rem;color:var(--text-color-light)}a{color:var(--primary-color);text-decoration:none;transition:color .2s ease}a:hover{color:var(--primary-color-dark);text-decoration:underline}strong{font-weight:600;color:var(--text-color)}code{background-color:#0000000a;padding:.2em .45em;margin:0 .1em;font-size:.875em;border-radius:var(--border-radius-sm);font-family:var(--font-code);color:#d63384;word-break:break-word;white-space:pre-wrap}.container{width:100%;max-width:1140px;margin-left:auto;margin-right:auto;padding-left:var(--container-padding-x);padding-right:var(--container-padding-x)}header.app-header{background-color:var(--primary-color);color:var(--text-color-on-primary);padding:1rem var(--container-padding-x);text-align:center;box-shadow:var(--shadow-sm)}header.app-header h1{margin:0;font-weight:600;font-size:1.6em;color:var(--text-color-on-primary)}nav.app-nav{background-color:var(--primary-color-dark);padding:.4rem 0;box-shadow:var(--shadow-sm);width:100%;border-bottom:1px solid rgba(0,0,0,.1)}nav.app-nav .nav-container{padding:0}nav.app-nav ul{list-style:none;text-align:center;display:flex;flex-direction:column;align-items:stretch}nav.app-nav ul li{margin:0;width:100%}nav.app-nav ul li a{display:block;padding:.8rem 1rem;color:var(--text-color-on-primary);text-decoration:none;text-align:center;font-weight:500;font-size:.95em;border-bottom:1px solid rgba(255,255,255,.08);transition:background-color .2s ease-in-out,color .2s ease-in-out}nav.app-nav ul li:last-child a{border-bottom:none}nav.app-nav ul li a:hover,nav.app-nav ul li a:focus{background-color:#ffffff1a}nav.app-nav ul li a.router-link-exact-active{background-color:var(--primary-color);color:#fff;font-weight:600}#vue-app-container{display:flex;flex-direction:column;min-height:100vh}main.container.main-content-area{flex-grow:1;padding-top:30px;padding-bottom:40px}.qa-box-container.container{margin-top:30px;margin-bottom:40px}.card{background-color:var(--card-background-color);padding:20px 25px;border-radius:var(--border-radius-md);box-shadow:var(--shadow-md);border:1px solid var(--border-color);margin-bottom:30px}.topic-view-container>.card:last-of-type,.topic-view-container>.exercise-section-wrapper:last-of-type{margin-bottom:0}.card h2{color:var(--primary-color-dark);border-bottom:1px solid var(--border-color);padding-bottom:12px;margin-top:0;margin-bottom:25px;font-weight:600;font-size:1.6em}.card h3{color:var(--text-color);margin-top:25px;margin-bottom:12px;font-weight:600;font-size:1.3em}.card h4{color:var(--text-color-light);margin-top:18px;margin-bottom:10px;font-weight:600;font-size:1.05em}.card p,.card li{line-height:1.7;margin-bottom:.8rem;font-size:.95rem}.card strong{color:var(--text-color)}.table-responsive-wrapper{width:100%;overflow-x:auto;margin:20px 0;border:1px solid var(--border-color);border-radius:var(--border-radius-sm);background-color:var(--card-background-color)}table.verb-table-component,.table-responsive-wrapper table{width:100%;min-width:500px;border-collapse:collapse;font-size:.9em}table.verb-table-component th,.table-responsive-wrapper table th,table.verb-table-component td,.table-responsive-wrapper table td{border:1px solid var(--border-color);padding:10px 12px;text-align:left;vertical-align:middle}table.verb-table-component th,.table-responsive-wrapper table th{background-color:#f8f9fa;font-weight:600;color:var(--text-color);position:sticky;top:0;z-index:1;white-space:nowrap}.btn{display:inline-block;font-weight:500;color:#fff;text-align:center;vertical-align:middle;cursor:pointer;-webkit-user-select:none;user-select:none;background-color:var(--primary-color);border:1px solid var(--primary-color);padding:.6rem 1.2rem;font-size:.95em;line-height:1.5;border-radius:var(--border-radius-md);text-decoration:none;transition:all .2s ease-in-out}.btn:hover,.btn:focus{background-color:var(--primary-color-dark);border-color:var(--primary-color-dark);color:#fff;transform:translateY(-2px);box-shadow:var(--shadow-sm);outline:none}.btn-small{padding:.35rem .75rem;font-size:.8em}.btn.btn-outline{background-color:transparent;border-color:var(--primary-color);color:var(--primary-color)}.btn.btn-outline:hover,.btn.btn-outline:focus{background-color:var(--primary-color);color:#fff}.example,.tip{padding:18px 22px;border-radius:var(--border-radius-sm);margin:25px 0;border:1px solid}.example{background-color:var(--primary-color-light);border-color:#bce0fd;color:#00376e}.example p:last-child,.tip p:last-child{margin-bottom:0}.example code,.tip code{background-color:#0000000d}.tip{background-color:#fff3cd;border-left:4px solid var(--warning-color);color:#664d03}.tip strong{color:#523e02}.exercise-section-description{font-size:.95em;color:var(--text-color-light);margin-bottom:25px;font-style:italic}.check-exercises-btn{margin-top:30px;display:block;margin-left:auto;margin-right:auto;padding:10px 20px}.exercise-item-card{background-color:#fdfdfd;border-radius:var(--border-radius-sm);padding:15px;margin-bottom:15px;box-shadow:var(--shadow-sm);border:1px solid #f0f0f0}.feedback-correct{color:var(--success-color)}.feedback-incorrect{color:var(--error-color)}.feedback-neutral{color:var(--text-color-light)}#qa-box{display:flex;flex-direction:column;height:100%;max-height:600px;border-radius:var(--border-radius-md);box-shadow:var(--shadow-md);overflow:hidden;background-color:#f8f9fa}#qa-area{border:1px solid var(--border-color);background-color:#fdfdfd}.user-message{background-color:var(--primary-color);color:var(--text-color-on-primary)}.bot-message{background-color:#e9ecef;color:var(--text-color)}#input-area{background-color:#f8f9fa;border-top:1px solid var(--border-color)}#user-question{border:1px solid var(--input-border-color)}.video-container{position:relative;padding-bottom:56.25%;height:0;overflow:hidden;max-width:100%;background:#e0e0e0;margin:25px auto;border-radius:var(--border-radius-md);box-shadow:var(--shadow-md)}.video-container iframe{position:absolute;top:0;left:0;width:100%;height:100%;border:0}footer.app-footer{text-align:center;padding:1.8rem 0;background-color:#2c3e50;color:#bdc3c7;margin-top:50px;font-size:.85em;border-top:1px solid #343a40}footer.app-footer p{margin:0}@media (min-width: 768px){html{font-size:var(--base-font-size-tablet, 15px)}nav.app-nav ul{flex-direction:row;justify-content:center}nav.app-nav ul li{width:auto;border-bottom:none}nav.app-nav ul li a{border-bottom:none}header.app-header h1{font-size:1.7em}.card h2{font-size:1.6em}}@media (min-width: 992px){html{font-size:var(--base-font-size-desktop, 16px)}header.app-header h1{font-size:1.8em}.card h2{font-size:1.75em}}