* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Segoe UI', Tahoma, sans-serif; background: #f0f2f5; color: #333; }
.container { max-width: 1200px; margin: 0 auto; padding: 20px; }
h1 { color: #1a252f; margin-bottom: 20px; }
.card { background: #fff; border-radius: 8px; padding: 20px; margin-bottom: 20px; box-shadow: 0 2px 4px rgba(0,0,0,0.1); }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: center; padding: 10px; border-bottom: 1px solid #ddd; }
th { background: #f8f9fa; font-weight: 600; text-align: center; }
.btn { display: inline-block; padding: 8px 16px; border-radius: 4px; border: none; cursor: pointer; font-size: 14px; text-decoration: none; }
.btn-primary { background: #17a2b8; color: #fff; }
.btn-primary:hover { background: #138496; }
.btn-danger { background: #dc3545; color: #fff; }
.btn-danger:hover { background: #c82333; }
.btn-success { background: #28a745; color: #fff; }
.btn-warning { background: #ffc107; color: #333; }
.form-group { margin-bottom: 15px; }
.form-group label { display: block; margin-bottom: 5px; font-weight: 600; }
.form-group input, .form-group select { width: 100%; padding: 8px 12px; border: 1px solid #ddd; border-radius: 4px; font-size: 14px; }
.form-group input:focus, .form-group select:focus { outline: none; border-color: #17a2b8; }
.alert { padding: 12px; border-radius: 4px; margin-bottom: 15px; display: none; }
.alert-success { background: #d4edda; color: #155724; border: 1px solid #c3e6cb; }
.alert-danger { background: #f8d7da; color: #721c24; border: 1px solid #f5c6cb; }
.login-box { max-width: 400px; margin: 100px auto; }
.nav { background: #1a252f; padding: 15px 0; margin-bottom: 30px; }
.nav .container { display: flex; justify-content: space-between; align-items: center; }
.nav a { color: #fff; text-decoration: none; margin-right: 20px; font-size: 14px; }
.nav a:hover { color: #17a2b8; }
.nav .user-info { color: #aaa; font-size: 13px; }
.action-bar { margin-bottom: 15px; }
.modal { display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.5); z-index: 1000; }
.modal-content { background: #fff; margin: 10% auto; padding: 20px; max-width: 500px; border-radius: 8px; position: relative; }
.modal-close { position: absolute; top: 10px; right: 15px; font-size: 24px; cursor: pointer; color: #999; }
.modal-close:hover { color: #333; }
.modul-kartlari { display: flex; gap: 20px; flex-wrap: wrap; }
.modul-karti { background: #fff; border-radius: 8px; padding: 25px; width: 280px; cursor: pointer; box-shadow: 0 2px 8px rgba(0,0,0,0.1); transition: transform 0.2s, box-shadow 0.2s; }
.modul-karti:hover { transform: translateY(-3px); box-shadow: 0 4px 16px rgba(0,0,0,0.15); }
.modul-karti-ikon { font-size: 36px; margin-bottom: 10px; }
.modul-karti-baslik { font-size: 18px; font-weight: 600; margin-bottom: 5px; color: #1a252f; }
.modul-karti-aciklama { font-size: 13px; color: #888; }
.geri-don { display: inline-block; margin-bottom: 15px; color: #17a2b8; text-decoration: none; font-size: 14px; }
.geri-don:hover { text-decoration: underline; }
.modul-etiket { display: inline-block; padding: 2px 8px; border-radius: 3px; font-size: 11px; background: #e2e3e5; color: #383d41; margin: 2px; }