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24px}.footer-links-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:24px;margin-bottom:48px}.footer-column{display:flex;flex-direction:column}.footer-subsection{margin-bottom:24px}.social-section{margin-top:12px}.footer-heading{font-size:18px;font-weight:700;margin:0 0 16px;color:var(--duo-text-primary);letter-spacing:.5px}.footer-list{list-style:none;padding:0;margin:0}.footer-list li{margin-bottom:10px}.footer-list a{text-decoration:none;color:var(--duo-text-secondary);font-weight:600;font-size:15px;transition:color .2s ease}.footer-list a:hover{color:var(--duo-text-primary)}.footer-divider{border:none;border-top:2px solid rgba(255,255,255,.2);margin:0 0 32px}.footer-language-area{display:flex;flex-direction:column;gap:12px}.language-label{font-weight:700;font-size:15px;color:var(--duo-text-primary);margin-bottom:5px}.language-list{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:6px 20px}.language-list li a{text-decoration:none;color:var(--duo-text-secondary);font-weight:600;font-size:14px}.language-list li a:hover{color:var(--duo-text-primary)}@media(max-width:960px){.footer-links-grid{grid-template-columns:repeat(3,1fr)}.footer-container{padding:0 20px}}@media(max-width:600px){.footer-links-grid{grid-template-columns:1fr;gap:20px}.footer-container{padding:0 15px}.footer-heading{font-size:16px}.footer-list a{font-size:14px}.language-list{gap:4px 15px}.language-list li a{font-size:13px}}.grammar-container{max-width:1200px;margin:0 auto;padding:80px;font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;color:#333}.grammar-header{display:flex;justify-content:center;gap:15px;margin-bottom:30px;flex-wrap:wrap}.class-tab-btn{padding:10px 20px;border:none;background-color:#f0f0f0;border-radius:25px;cursor:pointer;font-size:1rem;font-weight:600;transition:all .3s ease;color:#555}.class-tab-btn:hover{background-color:#e0e0e0;transform:translateY(-2px)}.class-tab-btn.active{background-color:#007bff;color:#fff;box-shadow:0 4px 10px #007bff4d}.class-title{text-align:center;margin-bottom:40px;color:#2c3e50;font-size:2rem;border-bottom:2px solid #eee;padding-bottom:10px}.topic-card{display:flex;flex-direction:row;background:#fff;border-radius:12px;box-shadow:0 4px 15px #0000000d;margin-bottom:40px;overflow:hidden;border:1px solid #e1e4e8}.topic-content{flex:1;padding:30px}.topic-content h3{color:#007bff;margin-top:0;font-size:1.5rem}.topic-description{line-height:1.6;color:#555;margin-bottom:20px}.key-points{background-color:#f8f9fa;padding:15px;border-left:4px solid #28a745;border-radius:4px}.key-points h4{margin-top:0;color:#28a745}.key-points ul{padding-left:20px;margin-bottom:0}.video-container{flex:1;background-color:#000;position:relative;min-height:300px}.video-responsive{width:100%;height:100%;border:none}@media(max-width:900px){.grammar-container{padding:40px 20px}.topic-card{flex-direction:column}.video-container{height:300px;width:100%}.grammar-header{gap:10px}.class-tab-btn{padding:8px 15px;font-size:.9rem}.class-title{font-size:1.5rem}}@media(max-width:600px){.grammar-container{padding:20px 15px}.topic-content{padding:20px}.class-tab-btn{padding:6px 12px;font-size:.8rem}.class-title,.topic-content h3{font-size:1.3rem}.video-container{height:250px}}#root,.app-container{min-height:100vh;display:flex;flex-direction:column}.main-content{flex:1;padding-top:60px}@media(max-width:768px){.main-content{padding-top:70px}}@media(max-width:480px){.main-content{padding-top:80px}}