body {
            background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            font-family: 'Segoe UI', sans-serif;
        }
        .login-card {
            background: rgba(255,255,255,0.97);
            border-radius: 16px;
            padding: 40px;
            width: 100%;
            max-width: 420px;
            box-shadow: 0 20px 60px rgba(0,0,0,0.3);
        }
        .login-card h3 {
            color: #0f3460;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .login-card .subtitle {
            color: #666;
            font-size: 14px;
            margin-bottom: 30px;
        }
        .login-card .form-control {
            border-radius: 10px;
            padding: 12px 16px;
            border: 2px solid #e0e0e0;
            transition: border-color 0.3s;
        }
        .login-card .form-control:focus {
            border-color: #0f3460;
            box-shadow: 0 0 0 3px rgba(15,52,96,0.1);
        }
        .btn-giris {
            background: linear-gradient(135deg, #0f3460, #1a5276);
            border: none;
            border-radius: 10px;
            padding: 12px;
            font-weight: 600;
            font-size: 16px;
            width: 100%;
            color: #fff;
            transition: transform 0.2s, box-shadow 0.2s;
        }
        .btn-giris:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(15,52,96,0.3);
            color: #fff;
        }
        .logo-area {
            text-align: center;
            margin-bottom: 24px;
        }
        .logo-area .logo-icon {
            padding: 12px 24px;
            background: linear-gradient(135deg, #0f3460, #1a5276);
            border-radius: 16px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 18px;
            font-weight: 900;
            margin-bottom: 12px;
            letter-spacing: 1px;
        }