*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background-color:#f5f5f5}.app-shell{min-height:100vh;display:flex;flex-direction:column}header{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;padding:1rem 2rem;box-shadow:0 2px 10px #0000001a}header h1{margin:0 0 1rem;font-size:2rem;font-weight:600}.nav-list{list-style:none;padding:0;margin:0;display:flex;gap:1.5rem;flex-wrap:wrap}.nav-list li{margin:0}.nav-list a{color:#fff;text-decoration:none;padding:.5rem 1rem;border-radius:6px;transition:background-color .2s ease;font-weight:500}.nav-list a:hover{background-color:#fff3}.cross-app-nav{margin-top:1rem;padding-top:1rem;border-top:1px solid rgba(255,255,255,.2)}.cross-app-nav h3{margin:0 0 .5rem;font-size:1rem;font-weight:500;opacity:.9}.cross-app-list{list-style:none;padding:0;margin:0;display:flex;gap:1rem;flex-wrap:wrap}.cross-app-list li{margin:0}.cross-app-list a{color:gold;text-decoration:none;padding:.5rem 1rem;border:2px solid #ffd700;border-radius:6px;transition:all .2s ease;font-weight:600;background-color:#ffd7001a}.cross-app-list a:hover{background-color:gold;color:#667eea;transform:translateY(-2px);box-shadow:0 4px 12px #ffd7004d}main{flex:1;padding:2rem;background-color:#fffffff2;margin:1rem;border-radius:12px;box-shadow:0 8px 32px #0000001a;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.2)}footer{background-color:#333;color:#fff;text-align:center;padding:1rem;margin-top:auto}@media (max-width: 768px){header{padding:1rem}.nav-list,.cross-app-list{flex-direction:column;gap:.5rem}main{margin:.5rem;padding:1rem}}body.app-one{background:linear-gradient(135deg,#667eea,#764ba2,#f093fb);min-height:100vh}body.app-one header{background:linear-gradient(135deg,#8b5cf6,#a855f7,#ec4899)}body.app-one main{background-color:#ffffffe6;border:1px solid rgba(139,92,246,.2)}