:root{
  --primary: #0b3d91; 
  --secondary: #ff7a00; 
  --muted: #f4f6fb;
  --card-radius: 12px;
}
*{box-sizing:border-box}
body{font-family:Inter, system-ui, Arial, sans-serif;margin:0;background:linear-gradient(180deg,#f8fbff 0%, #ffffff 100%);color:#102a43}
.container{max-width:1100px;margin:0 auto;padding:20px}
.site-header{background:var(--primary);color:#fff;padding:12px 0;position:sticky;top:0;z-index:50;box-shadow:0 6px 18px rgba(11,61,145,0.08)}
.nav-row{display:flex;align-items:center;justify-content:space-between}
.brand{font-weight:700;color:#fff;text-decoration:none;font-size:22px}
.main-nav a{margin-left:16px;color:#fff;text-decoration:none}
.nav-toggle{display:none;background:transparent;border:0;color:#fff;font-size:20px}
@media(max-width:800px){.main-nav{display:none}.open-nav .main-nav{display:block;position:absolute;left:0;right:0;top:64px;background:var(--primary);padding:12px}.nav-toggle{display:block}}
.card{background:#fff;border-radius:var(--card-radius);padding:18px;box-shadow:0 8px 24px rgba(10,25,47,0.06);transition:transform .22s ease,box-shadow .22s ease}
.card:hover{transform:translateY(-6px);box-shadow:0 14px 40px rgba(11,61,145,0.08)}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:18px}
.h-hero{display:flex;align-items:center;gap:24px;padding:40px 0}
.hero-cta button{background:var(--secondary);border:0;padding:12px 18px;color:#fff;border-radius:10px;cursor:pointer}
.section-title{margin:10px 0 18px;font-size:20px;color:var(--primary)}
.course-badge{display:inline-block;padding:6px 10px;background:var(--muted);border-radius:999px;font-weight:600}
.profile-row{display:flex;gap:18px;align-items:flex-start}
.avatar{width:96px;height:96px;border-radius:999px;background:linear-gradient(135deg,var(--primary),var(--secondary));display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700}
input,select,textarea{width:100%;padding:10px;border-radius:8px;border:1px solid #e6eef8}
button.btn{background:var(--primary);color:#fff;border:0;padding:10px 14px;border-radius:8px;cursor:pointer}
.small{font-size:13px;color:#556}
.topbar{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px}
.alert{padding:10px;border-radius:8px;background:#fff7ea;color:#7a4e00;border:1px solid #ffeed0}
.fade-in{animation:fadeIn .6s ease both}
@keyframes fadeIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}