body {
            background-color: #f4f6f9;
            font-family: 'Segoe UI', sans-serif;
        }

        .sidebar {
            min-height: 100vh;
            background: linear-gradient(180deg, #1a1c2c 0%, #2d3154 100%);
            color: white;
        }

        .nav-link {
            color: rgba(255, 255, 255, .7);
            padding: 12px 20px;
            margin-bottom: 5px;
            border-radius: 8px;
            cursor: pointer;
            transition: all 0.3s;
        }

        .nav-link:hover,
        .nav-link.active {
            color: white;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        }

        .nav-link i {
            width: 24px;
        }

        .card-stat {
            border-radius: 15px;
            color: white;
            position: relative;
            border: none;
            overflow: hidden;
        }

        .card-stat::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -50%;
            width: 100%;
            height: 200%;
            background: rgba(255, 255, 255, 0.1);
            transform: rotate(45deg);
        }

        .icon-bg {
            position: absolute;
            right: 15px;
            bottom: 15px;
            font-size: 3.5rem;
            opacity: 0.2;
        }

        #loader {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(255, 255, 255, 0.95);
            z-index: 9999;
            display: flex;
            justify-content: center;
            align-items: center;
            flex-direction: column;
        }

        .table-action-btn {
            cursor: pointer;
            margin: 0 3px;
            font-size: 1rem;
            padding: 5px 8px;
            border-radius: 5px;
            transition: all 0.2s;
        }

        .table-action-btn:hover {
            transform: scale(1.1);
        }

        .section-card {
            border: none;
            border-radius: 15px;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
        }

        .section-card .card-header {
            background: white;
            border-bottom: 2px solid #f0f0f0;
            font-weight: 700;
            border-radius: 15px 15px 0 0 !important;
        }

        .badge-gender-kiz {
            background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
        }

        .badge-gender-erkek {
            background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
        }

        .modal-header-edit {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
        }

        .form-section-title {
            font-size: 0.85rem;
            font-weight: 700;
            color: #667eea;
            text-transform: uppercase;
            letter-spacing: 1px;
            margin: 15px 0 10px 0;
            padding-bottom: 5px;
            border-bottom: 2px solid #f0f0f0;
        }