* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, sans-serif; line-height: 1.6;
       max-width: 700px; margin: 0 auto; padding: 20px; color: #333; }
header { border-bottom: 2px solid #2c3e50; padding-bottom: 10px;
         margin-bottom: 30px; }
header h1 { color: #2c3e50; }
header h1 a { color: #2c3e50; text-decoration: none; }
h2 { margin: 20px 0 10px; color: #34495e; }
a { color: #2980b9; }
form { margin-top: 15px; }
label { display: block; margin-top: 10px; font-weight: bold; }
input, textarea { width: 100%; padding: 8px; margin-top: 4px;
                  border: 1px solid #bdc3c7; border-radius: 4px; }
button { margin-top: 15px; padding: 10px 25px; background: #2c3e50;
         color: white; border: none; border-radius: 4px; cursor: pointer; }
button:hover { background: #34495e; }
footer { margin-top: 40px; padding-top: 10px; border-top: 1px solid #eee;
         color: #999; font-size: 14px; }
.error-page { text-align: center; padding: 60px 0; }
.error-page h1 { font-size: 72px; color: #e74c3c; }
.error-page p { font-size: 18px; margin-top: 10px; }