body { font-family: 'Segoe UI', sans-serif; margin: 0; background: #f0f2f5; }
.container { max-width: 1000px; margin: 30px auto; padding: 0 20px; }
nav { background: white; padding: 15px 30px; display: flex; justify-content: space-between; align-items: center; box-shadow: 0 2px 5px rgba(0,0,0,0.05); }
.logo-area img { height: 30px; vertical-align: middle; margin-right: 10px; }
.card { background: white; padding: 20px; border-radius: 10px; box-shadow: 0 2px 5px rgba(0,0,0,0.05); }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.grid-3 { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 20px; }
input, textarea, select { width: 100%; padding: 10px; margin: 5px 0; border: 1px solid #ccc; border-radius: 5px; box-sizing: border-box; }
button, .btn { background: #007bff; color: white; border: none; padding: 10px 15px; border-radius: 5px; cursor: pointer; text-decoration: none; display: inline-block; }
.danger { background: #dc3545; }
.adm { color: #dc3545; font-weight: bold; }
.mt-20 { margin-top: 20px; }
.center { text-align: center; }
.truncate { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
footer { text-align: center; padding: 20px; color: #666; }