:root{--primary-color:#1e88e5;--secondary-color:#26c6da;--accent-color:#ff9800;--text-color:#333;--light-text:#fff;--background-color:#f5f5f5;--footer-bg:#263238;--header-height:70px;--transition:all 0.3s ease}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Segoe UI,Roboto,Oxygen,Ubuntu,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;color:var(--text-color);background-color:var(--background-color);line-height:1.6}.app{display:flex;flex-direction:column;min-height:100vh}.main-content{flex:1 1;padding-top:var(--header-height)}.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}.btn{display:inline-block;padding:10px 20px;background-color:var(--primary-color);color:var(--light-text);border:none;border-radius:4px;cursor:pointer;text-decoration:none;font-weight:500;transition:var(--transition)}.btn:hover{background-color:#1565c0;transform:translateY(-2px)}.btn-secondary{background-color:var(--secondary-color)}.btn-secondary:hover{background-color:#00acc1}h1,h2,h3,h4,h5,h6{margin-bottom:1rem;line-height:1.2}h1{font-size:2.5rem}h2{font-size:2rem}h3{font-size:1.75rem}a{color:var(--primary-color);text-decoration:none;transition:var(--transition)}a:hover{color:#1565c0}img{max-width:100%;height:auto}.section{padding:60px 0}.section-title{text-align:center;margin-bottom:40px}@media (max-width:768px){h1{font-size:2rem}h2{font-size:1.75rem}h3{font-size:1.5rem}.section{padding:40px 0}}.loading{display:flex;justify-content:center;align-items:center;height:100vh;width:100%}.loading-spinner{border:4px solid rgba(0,0,0,.1);border-radius:50%;border-top:4px solid var(--primary-color);width:40px;height:40px;animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0deg)}to{transform:rotate(1turn)}}