.app-footer{color:#fff;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);margin-top:auto;padding:1.5rem 2rem;box-shadow:0 -2px 10px #0000001a}.footer-content{flex-wrap:wrap;justify-content:center;align-items:center;gap:1rem;max-width:1200px;margin:0 auto;display:flex}.footer-text{color:#fffffff2;margin:0;font-size:.95rem;font-weight:400}.footer-text strong{color:#fff;font-weight:700}.footer-badge{-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);letter-spacing:.5px;text-transform:uppercase;background:#fff3;border:1px solid #ffffff4d;border-radius:20px;padding:.35rem .85rem;font-size:.85rem;font-weight:600;display:inline-block;box-shadow:0 2px 8px #0000001a}@media (max-width:640px){.app-footer{padding:1rem 1.5rem}.footer-content{text-align:center;flex-direction:column;gap:.75rem}.footer-text{font-size:.9rem}.footer-badge{padding:.3rem .75rem;font-size:.8rem}}
*{box-sizing:border-box;margin:0;padding:0}body{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif}code{font-family:source-code-pro,Menlo,Monaco,Consolas,Courier New,monospace}.App{background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);min-height:100vh}.main-navigation{-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);z-index:1000;background:#fffffff2;justify-content:space-between;align-items:center;padding:1.5rem 2rem;display:flex;position:sticky;top:0;box-shadow:0 4px 20px #0000001a}.nav-brand h1{color:#667eea;margin:0;font-size:1.8rem;font-weight:700}.nav-subtitle{color:#666;margin:0;font-size:.9rem;font-weight:400}.nav-links{gap:1rem;display:flex}.nav-button{color:#333;cursor:pointer;background:#f5f5f5;border:2px solid #0000;border-radius:12px;align-items:center;gap:.5rem;padding:.8rem 1.5rem;font-size:1rem;font-weight:600;transition:all .3s;display:flex}.nav-button:hover{background:#e8e8e8;transform:translateY(-2px);box-shadow:0 4px 12px #0000001a}.nav-button.active{color:#fff;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);border-color:#667eea;box-shadow:0 4px 20px #667eea4d}.nav-icon{font-size:1.2rem}.main-content{min-height:calc(100vh - 100px);padding:0}.home-page{background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);min-height:calc(100vh - 100px);padding:3rem 2rem}.home-header{text-align:center;color:#fff;margin-bottom:4rem;animation:.8s fadeInDown}.home-title{text-shadow:0 4px 20px #0003;letter-spacing:-1px;margin:0 0 1rem;font-size:3.5rem;font-weight:800}.home-subtitle{opacity:.95;margin:0 0 1rem;font-size:1.5rem;font-weight:300}.home-description{opacity:.85;margin:0;font-size:1.1rem;font-weight:400}.tiles-container{grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:2rem;max-width:1200px;margin:0 auto;animation:1s fadeInUp;display:grid}.tile{cursor:pointer;background:#fff;border-radius:16px;flex-direction:column;min-height:380px;padding:2rem;transition:all .4s cubic-bezier(.175,.885,.32,1.275);display:flex;position:relative;overflow:hidden;box-shadow:0 10px 40px #00000026}.tile:before{content:"";transform-origin:0;background:linear-gradient(90deg,#667eea 0%,#764ba2 100%);width:100%;height:4px;transition:transform .4s;position:absolute;top:0;left:0;transform:scaleX(0)}.tile:hover:before{transform:scaleX(1)}.tile:hover{transform:translateY(-8px)scale(1.02);box-shadow:0 20px 60px #00000040}.tile-icon{margin-bottom:1rem;font-size:3.5rem;transition:transform .3s}.tile:hover .tile-icon{transform:scale(1.15)rotate(5deg)}.tile-title{color:#333;margin:0 0 1rem;font-size:1.8rem;font-weight:700}.tile-description{color:#666;flex-grow:1;margin:0 0 1.5rem;font-size:1rem;line-height:1.6}.tile-features{margin:0 0 1.5rem;padding:0;list-style:none}.tile-features li{color:#555;padding:.5rem 0;font-size:.95rem;line-height:1.4}.tile-badge{color:#fff;text-align:center;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);border-radius:20px;padding:.5rem 1rem;font-size:.85rem;font-weight:600;position:absolute;top:1rem;right:1rem}.tile-badge.coming-soon{background:linear-gradient(135deg,orange 0%,tomato 100%)}.tile-button{color:#fff;cursor:pointer;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);border:none;border-radius:10px;width:100%;margin-top:auto;padding:.9rem 1.5rem;font-size:1rem;font-weight:600;transition:all .3s}.tile-button:hover{transform:translateY(-2px);box-shadow:0 6px 20px #667eea66}.tile-button:active{transform:translateY(0)}.tile-algos{border-top:4px solid #667eea}.tile-algos .tile-title{color:#667eea}.tile-problems{border-top:4px solid #764ba2}.tile-problems .tile-title{color:#764ba2}.tile-quizz{opacity:.85;cursor:not-allowed;border-top:4px solid #48bb78}.tile-quizz:hover{transform:translateY(-4px)scale(1.01)}.tile-quizz .tile-title{color:#48bb78}.tile-interview{opacity:.85;cursor:not-allowed;border-top:4px solid #ed8936}.tile-interview:hover{transform:translateY(-4px)scale(1.01)}.tile-interview .tile-title{color:#ed8936}.tile-datastructures{opacity:.85;cursor:not-allowed;border-top:4px solid #4299e1}.tile-datastructures:hover{transform:translateY(-4px)scale(1.01)}.tile-datastructures .tile-title{color:#4299e1}.tile-progress{opacity:.85;cursor:not-allowed;border-top:4px solid #9f7aea}.tile-progress:hover{transform:translateY(-4px)scale(1.01)}.tile-progress .tile-title{color:#9f7aea}.home-footer{text-align:center;color:#fff;opacity:.9;margin-top:4rem;padding:2rem 0;font-size:1.1rem;font-weight:300}@keyframes fadeInDown{0%{opacity:0;transform:translateY(-30px)}to{opacity:1;transform:translateY(0)}}@keyframes fadeInUp{0%{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}.burger-menu{cursor:pointer;z-index:1001;background:0 0;border:none;flex-direction:column;gap:5px;padding:8px;transition:all .3s;display:none}.burger-menu span{background:#667eea;border-radius:3px;width:28px;height:3px;transition:all .3s}.burger-menu.open span:first-child{transform:rotate(45deg)translate(7px,7px)}.burger-menu.open span:nth-child(2){opacity:0}.burger-menu.open span:nth-child(3){transform:rotate(-45deg)translate(7px,-7px)}.nav-user-section{align-items:center;gap:1rem;display:flex}.nav-user-email{color:#666;font-size:.9rem}.nav-logout{color:#fff!important;background:#f44!important}@media (max-width:768px){.burger-menu{display:flex}.nav-links{-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);opacity:0;background:#fffffffa;flex-direction:column;max-height:calc(100vh - 80px);padding:1rem;transition:all .3s;position:fixed;top:80px;left:0;right:0;overflow-y:auto;transform:translate(-100%);box-shadow:0 4px 20px #00000026}.nav-links.mobile-open{opacity:1;transform:translate(0)}.nav-user-section{flex-direction:column;gap:.75rem;width:100%}.nav-user-email{text-align:center;width:100%}.nav-button{justify-content:center;width:100%}.home-page{padding:2rem 1rem}.home-header{margin-bottom:2rem}.home-title{font-size:2.5rem}.home-subtitle{font-size:1.2rem}.home-description{font-size:1rem}.tiles-container{grid-template-columns:1fr;gap:1.5rem}.tile{min-height:320px;padding:1.5rem}.tile-icon{font-size:3rem}.tile-title{font-size:1.5rem}.home-footer{margin-top:2rem;font-size:1rem}}