body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; background: #f4f7f6; margin: 0; }
.container { max-width: 900px; margin: 50px auto; background: white; padding: 30px; border-radius: 8px; box-shadow: 0 4px 6px rgba(0,0,0,0.1); }
.auth-box { max-width: 400px; margin: 100px auto; padding: 40px; background: white; border-radius: 8px; text-align: center; box-shadow: 0 4px 15px rgba(0,0,0,0.1); }
input, select { width: 100%; padding: 12px; margin: 10px 0; border: 1px solid #ddd; border-radius: 4px; box-sizing: border-box; }
button { width: 100%; padding: 12px; background: #2ecc71; color: white; border: none; border-radius: 4px; cursor: pointer; font-size: 16px; }
button:hover { background: #27ae60; }
.alert { padding: 10px; border-radius: 4px; margin-bottom: 15px; font-size: 14px; }
.error { background: #fee; color: #c0392b; border: 1px solid #f5c6cb; }
.success { background: #e8f8f5; color: #155724; border: 1px solid #c3e6cb; }
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 20px; }
.card { background: #fff; padding: 20px; border: 1px solid #eee; border-radius: 6px; }
h1, h2, h3 { color: #2c3e50; }
table { width: 100%; border-collapse: collapse; margin-top: 10px; }
th, td { padding: 10px; border-bottom: 1px solid #eee; text-align: left; }
.nav { display: flex; justify-content: space-between; align-items: center; margin-bottom: 30px; border-bottom: 2px solid #eee; padding-bottom: 15px; }