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UI,Tahoma,Geneva,Verdana,sans-serif;line-height:1.6;color:#333;background-color:#f5f7fa}.container{max-width:1200px;margin:0 auto;padding:0 20px}@media(max-width:768px){.container{padding:0 15px}}.btn{display:inline-block;padding:12px 24px;background:var(--primary-color);color:#fff;text-decoration:none;border:none;border-radius:4px;cursor:pointer;transition:all .3s ease;font-size:16px}.btn:hover{background:#2980b9;transform:translateY(-2px)}.btn-secondary{background:var(--secondary-color)}.btn-secondary:hover{background:#1a252f}.btn-success{background:var(--success-color)}.btn-success:hover{background:#27ae60}.btn-danger{background:var(--accent-color)}.btn-danger:hover{background:#c0392b}