/* Minimal professional styling */
body { font-family: Arial, Helvetica, sans-serif; margin:0; background:#f2f4f7; color:#222; }
header { background: #0b4f6c; color: #fff; padding: 12px 0; }
.nav-list { list-style:none; display:flex; gap:18px; justify-content:center; margin:0; padding:0; align-items:center; }
.nav-list li { display:inline-block; }
.nav-list li.right { margin-left: auto; margin-right: 20px; }
.nav-list a { color: #fff; text-decoration:none; font-weight:600; padding:6px 10px; display:inline-block; }
.container { max-width:1000px; margin:30px auto; background:#fff; padding:20px; border-radius:8px; box-shadow:0 6px 18px rgba(0,0,0,0.06); }
.home-hero { max-width:1000px; margin:40px auto; text-align:center; padding:40px; background:linear-gradient(135deg,#e8f0f8,#ffffff); border-radius:12px; }
.btn { display:inline-block; padding:8px 14px; background:#1672b9; color:#fff; text-decoration:none; border-radius:6px; }
.form label { display:block; margin-top:12px; font-weight:600; }
.form input[type="text"], .form input[type="email"], .form input[type="password"], select, textarea { width:100%; padding:8px; margin-top:6px; border:1px solid #ddd; border-radius:6px; }
.course-card { border:1px solid #e3e7ea; padding:12px; margin:12px 0; border-radius:8px; background:#fbfdff; }
table { width:100%; border-collapse:collapse; margin-top:12px; }
table th, table td { border:1px solid #e6e9ec; padding:8px; text-align:left; }
.error { color:#b00020; font-weight:600; }
footer { text-align:center; margin:20px 0; color:#666; }