* { box-sizing: border-box; font-family: 'Segoe UI', Arial, sans-serif; margin: 0; padding: 0; }
body { background-color: #f4f6f9; color: #333; padding: 20px; display: flex; flex-direction: column; align-items: center; }
.container { background: #ffffff; padding: 30px; border-radius: 8px; box-shadow: 0 4px 15px rgba(0,0,0,0.1); width: 100%; max-width: 800px; margin-bottom: 20px; }
h2, h3 { margin-bottom: 20px; color: #2c3e50; text-align: center; }
.form-group { margin-bottom: 15px; }
label { display: block; margin-bottom: 5px; font-weight: 600; color: #555; }
input[type="text"], input[type="email"], input[type="password"], select, input[type="number"] { width: 100%; padding: 10px; border: 1px solid #ccc; border-radius: 4px; font-size: 14px; }
button { background-color: #3498db; color: white; border: none; padding: 12px 20px; border-radius: 4px; cursor: pointer; width: 100%; font-size: 16px; font-weight: bold; }
button:hover { background-color: #2980b9; }
.msg { padding: 10px; margin-bottom: 15px; border-radius: 4px; text-align: center; font-weight: bold; }
.success { background-color: #d4edda; color: #155724; }
.error { background-color: #f8d7da; color: #721c24; }
table { width: 100%; border-collapse: collapse; margin-top: 20px; background: white; }
table, th, td { border: 1px solid #ddd; }
th, td { padding: 12px; text-align: left; }
th { background-color: #2c3e50; color: white; }
tr:nth-child(even) { background-color: #f9f9f9; }
.nav-links { display: flex; gap: 15px; margin-bottom: 20px; }
.nav-links a { text-decoration: none; color: #3498db; font-weight: bold; }
.score-input { width: 70px !important; padding: 5px !important; text-align: center; }