:root{--bs-primary:#3b82f6;--bs-secondary:#14b8a6;--bs-success:#10b981;--bs-info:#06b6d4;--bs-warning:#f59e0b;--bs-danger:#ef4444;--bs-light:#f8fafc;--bs-dark:#1e293b}body{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}.gradient-bg,.gradient-text{background:linear-gradient(135deg,#3b82f6,#14b8a6)}.gradient-text{-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.card-hover{transition:all .3s ease}.card-hover:hover{transform:translateY(-8px);box-shadow:0 20px 40px rgba(0,0,0,.1)}.btn-gradient{background:linear-gradient(135deg,#3b82f6,#14b8a6);border:none;color:#fff;transition:all .3s ease}.btn-gradient:hover{background:linear-gradient(135deg,#2563eb,#0f766e);color:#fff;transform:translateY(-2px)}.hero-bg{background:linear-gradient(135deg,#eff6ff,#fff 50%,#f0fdfa);position:relative}.hero-bg:before{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background-image:radial-gradient(circle at 25% 25%,rgba(59,130,246,.1) 0,transparent 50%),radial-gradient(circle at 75% 75%,rgba(20,184,166,.1) 0,transparent 50%);pointer-events:none}.section-padding{padding:5rem 0}.icon-box{width:60px;height:60px;border-radius:12px;display:flex;align-items:center;justify-content:center;margin:0 auto 1rem}.topic-card{border:1px solid #e2e8f0;border-radius:16px;transition:all .3s ease}.topic-card:hover{box-shadow:0 10px 30px rgba(0,0,0,.1);border-color:#3b82f6}.category-sidebar{position:-webkit-sticky;position:sticky;top:2rem}.testimonial-card{border-radius:16px;transition:all .3s ease}.testimonial-card:hover{transform:translateY(-4px);box-shadow:0 15px 35px rgba(0,0,0,.1)}.footer-bg{background:linear-gradient(135deg,#1e293b,#334155)}@media (max-width:768px){.section-padding{padding:3rem 0}.hero-title{font-size:2.5rem!important}}